U.S. patent number 3,634,947 [Application Number 05/082,314] was granted by the patent office on 1972-01-18 for coating apparatus.
This patent grant is currently assigned to Colgate-Palmolive Company. Invention is credited to Henry P. Furgal.
United States Patent |
3,634,947 |
Furgal |
January 18, 1972 |
COATING APPARATUS
Abstract
An apparatus for conditioning fibrous materials includes a
rotatable drum in which the fibrous material may be tumbled, as in
an automatic laundry dryer, and held, to the interior wall of the
drum, so as to be in form-retaining relationship therewith, a base
which has on an exterior surface thereof a conditioning agent for
the fibrous materials. On contact with the tumbling fibrous
materials, the conditioning agent is removed from the base and is
deposited on the materials in sufficient quantity to condition
them. Usually, the conditioning agent is a fabric softener and/or
antistatic agent of the synthetic organic surface active type, the
base is a thin flexible sheet or strip of material, such as paper
or suitable plastic, the conditioning takes place in an automatic
laundry dryer and the base is held to the dryer interior wall by an
adhesive, such as a pressure sensitive adhesive.
Inventors: |
Furgal; Henry P.
(Bernardsville, NJ) |
Assignee: |
Colgate-Palmolive Company (New
York, NY)
|
Family
ID: |
22170435 |
Appl.
No.: |
05/082,314 |
Filed: |
October 20, 1970 |
Current U.S.
Class: |
34/60; 118/418;
206/813; 118/58; 206/.5; 427/242; 510/519 |
Current CPC
Class: |
D06M
23/00 (20130101); C11D 17/047 (20130101); D06M
23/02 (20130101); D06F 58/203 (20130101); Y10S
206/813 (20130101) |
Current International
Class: |
D06M
23/02 (20060101); D06M 23/00 (20060101); D06F
58/20 (20060101); C11D 17/04 (20060101); E01b
029/04 () |
Field of
Search: |
;34/12,60,133 ;117/109
;118/76,77,78,19,418,417 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Kaplan; Morris
Claims
What is claimed is:
1. An apparatus for conditioning fibrous materials which comprises
an automatic laundry dryer drum or similar container for fibrous
materials, means for rotating the drum and tumbling fibrous
materials contained therein and, held to an interior wall of the
drum, in form-retaining relationship therewith, a base, having an
exterior surface thereof a conditioning agent for the fibrous
materials, which, on contact with such tumbling materials is
removable from the base and depositable on the materials in
sufficient quantity to condition them said base comprising a
flexible material and having a pressure sensitive adhesive on the
opposite surface thereof to effect said form-retaining
relationship.
2. An apparatus according to claim 1 comprising means for passing
heated air through the fibrous materials in the drum and in which
the drum is of form-retaining material.
3. An apparatus according to claim 1 wherein the flexible base has
an exterior surface thereof coated with a fabric softener and/or
antistatic agent.
4. An apparatus according to claim 1 wherein the interior of the
drum contains form-retaining baffle means and said baffle means
have attached thereto by a pressure sensitive adhesive a flexible
base having a external coating of fabric softener and/or antistatic
agent.
5. An apparatus according to claim 3 wherein each fabric softner--
flexible base-- pressure sensitive adhesive combination is in thin
strip or sheet form, with the conditioning agent being a surface
active synthetic organic fabric softener which, under the
conditions of automatic laundry drying, elevated temperature, high
humidity and repeated contact with tumbling moist laundry, is
gradually deposited on the tumbling laundry brought into contact
with it, and the pressure sensitive adhesive holds sufficiently to
the interior wall of the dryer drum under the conditions of drying
of laundry to maintain the strip or sheet of base material in
form-retaining contact with said interior wall.
Description
SUBJECT OF THE INVENTION
This invention relates to the conditioning of fibrous materials by
contacting them with a base having a conditioning agent on a
surface thereof. More particularly, the contacting is effected in a
rotatable drum, such as that of an automatic laundry dryer, and the
base is held to an interior wall of the drum so that, even if it is
normally flexible, it is maintained in form-retaining relationship
with the drum. The invention includes a conditioning article which
comprises the flexible base, conditioning agent on the base and
means for holding the flexible base in form-retaining relationship
with an interior wall of a tumbling drum, which means is preferably
a pressure sensitive adhesive.
BACKGROUND OF THE INVENTION
In the past conditioning agents have been used to improve the
properties of fibrous materials. Among the more important
properties that have been changed by such agents are softness,
electrostatic capacity and wrinkling characteristics. Although most
treatments conducted in the household laundry to modify these
properties have been effected in the washing machine, usually by
addition of a conditioning agent to the last rinse, such methods
possess certain inherent disadvantages which have led to attempts
to treat laundry and fibrous materials to be conditioned in other
operations which would normally be utilized in the laundry process.
By effecting such treatments in the dryer, the necessity for the
conditioning agent to be substantive to the fabrics and to adhere
to them strongly in preference to the solvent of the dilute
solutions of the rinse water would be obviated. Thus, soluble
treating compositions would be employable if there was a way to
distribute them over the surfaces of the fibrous materials being
treated when such surfaces were not immersed in wash water or rinse
water.
The use of sprays of fabric softeners or other applications of such
liquids to the laundry in the dryer usually requires complicated
and relatively expensive installations and even with these,
staining, spotting or other detrimental effects due to local
applications of excess conditioning agent may be observed. If a
flexible paper, sponge or cloth sheet is impregnated with
conditioning agent, such as quaternary ammonium salt, and the
product is tumbled with laundry in the dryer, staining is sometimes
noted, apparently due to temporary entrapments of the flexible
conditioning article in laundry being treated, which cause the
application of more conditioning agent than is desirable at
particular locations on the treated materials. Such local over
applications may also be caused by cracking and flaking off of the
conditioning compositions when the flexible substrate is folded,
creased, twisted, bent or otherwise distorted during tumbling with
laundry, due to the conditioning material being strained by such
actions. Of course, if the cationic conditioning agents used, such
as the quaternary ammonium salts, contact materials containing
color bodies or heavy metal ions, such as ferric or ferrous ions,
very obvious and substantive stains may be produced which are
extremely difficult to remove from the fabrics. They often require
dry cleaning and this is not always completely successful. Even if
such actions do not take place regularly, the possibility of only
occasional adverse effects of this type can sometimes prevent the
satisfactory marketing and sales of such a product.
In the past it has been suggested that an improved method of
applying conditioning agent to fibrous materials in the dryer would
involve the use of form-retaining bases for such material so that
the base would not bend, fold, crease or flex sufficiently to cause
enough strain to make the coating of conditioning composition flake
off from it. Thus, solids such as polystyrene foam balls have been
taught to be useful when coated with fabric conditioner. Such
articles tumble with the laundry and, although they are not
difficult to locate after use, they have to be found and separated
from the laundry after completion of the treatment cycle.
Furthermore, they should be of a certain density to prevent them
from riding atop the laundry load and not participating
sufficiently in the tumbling contact. Finally, although entrapment
in the laundry and resulting staining of the materials being
treated rarely occurs with such articles, it is possible in some
cases, especially if the items being laundered are large in size
and can become folded about the conditioning article.
DESCRIPTION OF THE INVENTION
Disadvantages accompanying other methods of conditioning laundry in
the drying operation are obviated in large part by the present
invention. Thus, the apparatuses, for conditioning fibrous
materials in accordance with this invention allow the conditioning
of laundry in the dryer, permit the use of water soluble
nonsubstantive conditioning agents, do not result in cracking and
flaking off of conditioning composition coatings due to entrapment
of the conditioning article in the laundry and allow it to be found
readily, after completion of the conditioning treatment. The method
allows the use of flexible bases for the conditioning compositions
and facilitates their storage, application and removal. It allows
economical production and convenient packaging and use of the
conditioning articles.
In accordance with the present invention, an apparatus for
conditioning fibrous materials comprises an automatic laundry dryer
drum or similar container for them, means for rotating the drum and
tumbling fibrous materials contained therein, and held to an
interior wall of the drum in form-retaining relationship therewith,
a base, having on an exterior surface thereof a conditioning agent
for the fibrous material. The conditioning agent, preferably a
fabric softener or antistatic agent, is removable from the base on
contact with the tumbling materials and is deposited on the
materials in sufficient quantity to condition them. In preferred
forms of the invention, the base is a thin flexible sheet or strip
of material, such as paper or suitable plastic, the conditioning
agent is waxy in nature and is mostly external to the base, and the
means for holding the base to the interior of the dryer or other
container is an adhesive, preferably a pressure sensitive adhesive,
which makes the article readily applicable and removable from the
drum wall. Also within the invention are the fabric conditioning
articles, in strips or sheets, or rolled, and combinations of
dispensers with such articles. Of course, uses of such apparatus
and articles are also part of the invention.
Various details, constructions, operations, uses and advantages of
the invention will be apparent from the following description,
taken in conjunction with the illustrative drawing of some
embodiments thereof, in which drawing:
THE DRAWING
FIG. 1 is a vertical sectional view of the interior of an automatic
laundry dryer drum;
FIG. 2 is a vertical section of a fiber conditioning tape of the
present invention;
FIG. 3 is a vertical section of another such tape;
FIG. 4 is a side elevation of a roll of conditioning tape, wound
around a mandrel tube; and
FIG. 5 is a vertical section of a combination dispenser and cutter
for a roll of conditioning tape, showing the tape in position
therein.
DETAILED DESCRIPTION OF THE INVENTION
In the apparatus of FIG. 1, automatic laundry dryer drum 11 has an
inner wall 13 on which baffles 15 are fastened, molded or pressed
out. Interior wall 13 is form-retaining and usually is of steel, as
are the baffles 15, the function of which is to assist in tumbling
laundry 17 being dried in the automatic laundry dryer. As the dryer
drum 11 rotates in a clockwise direction, as indicated by arrow 19,
the baffles tend to lift the laundry upward and to the left, after
which it is dropped down shortly before reaching the top of the
dryer, usually at a point corresponding to about 330.degree.. Drum
11 has operatively connected to it pulley 21 which is turned by
belt 23, rotated by connection with driving motor 25. Shown
fastened to the interior wall 13 is a form-retaining article 27
having a base portion 29 and a coating 31 of conditioning agent on
an external surface thereof, from which it can be abraded off onto
the surfaces of tumbling laundry articles, such as those designated
at 17, during contact made under the conditions in the dryer. Also,
shown are creped paper tapes 33 and 35, which have fabric softening
and antistatic agents on an external surface thereof and are held
to leading surfaces of baffles 15 by pressure sensitive adhesive or
other suitable means. Of course, in an automatic laundry dryer,
means are provided for the flow of warm air through the dryer and
the venting of humid air from it. Such means are conventional and
are not specifically illustrated herein. Also, it will be noted
that the tapes 33 and 35 will usually extend substantially across
the entire lengths of the baffles and the dryer drum interior.
In FIG. 2 are shown details of construction of the conditioning
agent-coated creped tape 33. The creped paper base 37 has a coating
of fabric softener 39 applied to the top surface thereof and on the
bottom, a coating of pressure sensitive rubber-type adhesive 41. As
is illustrated in FIG. 1, a length of such tape is installed
coaxially with the drum 11 on baffle 15 by pressing the pressure
sensitive adhesive against the surface of the baffle. For best
contact with the laundry the installation is on the leading edge of
the baffle, as shown but in other cases, installation can be on the
trailing edge, when such a good contact is not required or
desirable. In FIG. 3 is shown a similar tape 43 having a base
section 45, conditioning composition 47, adhesive 49 and a thin
waxy coating 51, to prevent adhesive 49 from adhering to
conditioning agent 47. As illustrated, the coating is on the
conditioning agent but it may be utilized as a separating thin
sheet of waxy paper or similar material to permit easy release.
In FIG. 4, cylindrical cardboard or paperboard mandrel 53 has
wrapped about it a length of conditioning tape 43, making a roll 54
from which the tape is conveniently dispensed, ready for use. In
FIG. 5, a dispenser frame or support 57 holds shaft or mounting
means 55 onto which mandrel 53 is operatively mounted. A roll 54 of
tape 43, wound on said mandrel, is unwound therefrom and led over a
cutting edge 59, where it can be severed to desired lengths for
application to the interior of the dryer drum.
The apparatus for conditioning fibrous materials is one which has
an enclosure which is either movable itself or in which clothing or
fabric fibers to be treated can be moved about, so as to be brought
into repeated contact with a conditioning agent. A preferred
apparatus includes a rotatable automatic laundry dryer drum so that
the conditioning can be effected by the housewife during the
ordinary drying of laundry. Nevertheless, industrial installations
and apparatuses different from but functionally equivalent to the
dryer drum may also be employed. Normally, these will rotate,
although other means of agitation and movement are also applicable.
Such containers will usually be form-retaining but may be made of
somewhat flexible material, providing that form-retaining bases for
the conditioning material are attached to them or, if flexible
bases are used, that there are sections of the container or drum
wall which are form-retaining, to which such bases may be attached.
It is preferable that the dryer drum be one which rotates and means
will be provided for effecting such rotation, said means usually
being a dryer motor-belt-pulley combination. Also, when drying with
conditioning, means will be provided for circulating drying air at
an elevated temperature through the articles being treated in the
drum.
An important aspect of the present invention is in the fixing in
position with respect to a drum wall of the conditioning means
being employed. Thus, if the conditioning means used is a coated
form-retaining article, such as a polystyrene foam slab,
represented at 27 in FIG. 1, rather than to allow it to be tumbled
with the clothing one will fasten it to a portion of the drum wall
or baffle thereon. Thus, there will be a predictable number of
revolutions of the conditioning article into contact with tumbling
clothing and entrapment of it will be prevented. Furthermore,
whatever the density of the base, the contact with the clothing
will be independent thereof. Also, after conclusion of the
conditioning, the housewife will know exactly where to find the
conditioning article. By repeated use, she will be able to
determine the best location of the article for effecting the most
desired conditioning treatments.
If the conditioning article is form-retaining, it may be any of
various suitable materials of construction, including paperboard,
cardboard, corrugated paperboard, other cellulosic products, wood,
metal, mineral, vegetable, and synthetic organic polymeric
plastics, either in foam, solid or hollow form or of reinforced or
similar structures. Thus, polyvinyl chloride, polystyrene, foamed
polystyrene, either open or closed cell, rigid polyurethane foam,
glass reinforced polyester, balsawood, soft pine, coconut shells,
foamed concrete, smooth pumice or other equivalent bases may be
employed. These may be perforated or continuous at their surfaces
and may be of various forms, such as tubes, e.g., cylinders or
rounded tubular shapes, discs, parallelograms, such as rectangles,
parallelepipeds, such as cubes, ellipsoids, spheres and many other
shapes, and may also be symbolic or decorative, e.g., pictures,
figures, flowers, symbols.
As was previously mentioned, it is preferred to employ flexible
substrates for the conditioning composition and these will usually
be in sheets, films or strips of any of a wide variety of suitable
materials including papers, plastics, rubbers, metals, cloths,
sponges, screens, fibers, felts and nonwoven fabrics. The various
fibrous materials may be natural or synthetic and usually,
preferably will be cellulosic. However, they may also be of
resilient foamed plastics, such as the polyurethanes. While the
thickness of the form-retaining bases may be almost any desired,
usually being at least 0.1 cm. thick and, rarely being of more than
10 cm. thick, that of the thin flexible material, such as sheeting,
will usually be from 0.001 to 0.1 cm. but in some cases, as when
flexible foams or sponges are employed, the thickness may be
increased to as much as about 1 cm. without detrimental effects.
The main consideration is that the material should be sufficiently
flexible to conform to and fit tightly against the form-retaining
inner wall of the dryer drum. Of course, the desired flexibility
and thinness will also assist in making the conditioning agent
easily rolled into a convenient package, which may be incorporated
in a dispenser. Although it is most useful to have the thin
flexible conditioning article in roll form, it may also be used as
a flat strip or sheet without being packaged into a roll or a roll
dispenser.
Among the fabric softeners and antistatic agents that are usable in
accord with the present invention are the nonionic surface active
materials, including higher fatty acid monolower alkanolamides,
higher fatty acid dilower alkanolamides, block copolymers of
ethylene oxide and propylene oxide, having hydrophilic and
lipophilic groups, alkyl (preferably middle alkyl) phenol polylower
alkylene oxide lower alkanols, polymers of lower alkylene glycols,
polyalkylene glycol ethers of higher fatty alcohols and
polyalkylene glycol esters of higher fatty acids. Among the anionic
agents are the higher fatty acid soaps of water soluble bases,
higher fatty alcohol sulfates, higher fatty acid monoglyceride
sulfates, sarcosides, taurides, isethionates and linear higher
alkyl aryl sulfonates. Cationic compounds include the higher alkyl
dilower alkyl amines, dihigher alkyl lower alkyl amines and
quaternary compounds, especially quaternary ammonium salts, e.g.,
quaternary ammonium halides. In the preceding description, lower,
as applied to various hydrocarbyl-containing groups, indicates a
carbon content of from 1 to 6, preferably from 2 to 3. Similarly,
higher includes compounds having from 10 to 20 carbon atoms,
preferably from 12 to 18. Of course, since it is important to the
present invention that the conditioning composition be in a solid
form, so that it can have conditioning agent gradually removed from
it by contact with tumbling laundry fabrics in a dryer or similar
machine, the fabric softening and/or antistatic agents will be
chosen to be in the solid state. Mixtures of nonionic conditioning
agents with either cationics or anionics of the types mentioned
above may also be used and generally, the proportions of components
of such mixtures will be chosen so as to have the final product in
most desired waxy condition and satisfactorily removable by a
combination of moisture, heat and abrading contact with laundry
that exists in an automatic dryer.
Specific examples of surface active materials of the types
described above are given in the text Synthetic Detergents by
Schwartz, Perry and Berch, published in 1958 by Interscience
Publishers, New York. See pages 25 to 143. Among the more preferred
of these are:
Nonionic--nonylphenoxy polyethoxy ethanol; stearic
monoethanolamide; stearic diethanolamide; block copolymers of
ethylene oxide and propylene oxide (Pluronics);
Anionic--sodium soap of mixed coconut oil and tallow fatty acids;
sodium stearate; potassium stearate; sodium laurate; tallow
alcohols sulfate;
Cationic--dilauryl dimethyl quaternary ammonium chloride;
hydrogenated tallow alkyl trimethyl ammonium bromide and
benzethonium chloride.
The above list is only illustrative of some of the compounds useful
in accordance with the present invention. Conditioning agents of
these types are well known in the art and others than those
mentioned above may also be used satisfactorily.
In addition to the fabric softening and/or antistatic and
antiwrinkling agents which are the principal conditioning
compounds, other components may also be present in these
conditioning compositions for their adjuvant effects. Thus, other
conditioning agents may be used, including those designed to treat
the fabrics in other ways than in softening. For example, perfumes,
brighteners, bactericides, solvents, thickening or hardening
agents, stabilizers and other materials may be incorporated in the
conditioning compositions. In some cases, small quantities of water
may be present, especially when the components form hydrates.
Plasticizers and release agents may be employed to assist in having
the conditioning compounds satisfactorily coat the substrate and to
facilitate release of the conditioning agent from the treated
articles upon subsequent laundering. Solvents and dispersants may
be used to assist in applying the conditioning compositions to the
base, principally in those cases where a flexible material, such as
paper, is being coated with the conditioning composition. The types
and proportions of the various adjuvants used will be chosen so to
make them interfere with the operations of the conditioning
compounds.
The final conditioning composition is preferably waxy in appearance
and is capable of being stored at room temperature without melting,
while yet being satisfactorily picked up by fabrics in the
operation of an automatic laundry dryer, when the fabrics tumbled
into contact with the conditioning composition. The conditioning
composition will be form-retaining at temperatures below 30.degree.
C. and preferably, also at all temperatures below 40.degree. C. It
may tend to fuse or melt under the higher temperatures obtaining in
the dryer, such as 70.degree. to 90.degree. C. but usually will be
only sufficiently softened, even in the presence of the
plasticizers, to be abraded off a treating article onto the surface
of material to be conditioned, at dryer conditions, including the
presence of moisture and drying gas at an elevated temperature. The
conditioning composition should be removable from a substrate
rather smoothly and in sufficient quantity to condition fabrics, at
a temperature from 40.degree. to 90.degree. C., preferably from
50.degree. to 80.degree. C. Normally, to effect these purposes, the
fabric softener and/or antistatic agent, the surface active
conditioning agent mentioned previously, will be a major proportion
of the conditioning composition, usually from 51 to 100 percent
thereof. Preferably it will comprise from 75 to 100 percent of the
composition. The various adjuvants will normally constitute any
remainder of the composition.
When the conditioning composition is employed as a coating on the
substrate, the thickness of the coating applied will normally be
within the range of 0.0005 to 0.5 centimeter, generally from 0.001
to 0.3 cm. and preferably from 0.005 or 0.05 to 0.2 cm. The
thickness given is that external to the outer surface of the thin
flexible material coated. A somewhat porous or rough surfaced
substrate or one having indentations will normally be preferred so
that the coating composition may penetrate below the outer surface
to a sufficient depth to hold the external coating firmly to the
surface and prevent its cracking or flaking off from the surface
during use. As a example of such a substrate may be mentioned paper
toweling, having a creped, crinkled or roughened appearance, as
contrasted to a smooth sheet of paper. Also, flexible polyurethane
foam can be used. A minor proportion of the external thickness of
coating agent may be below the surface. This will usually be held
to 10 to 30 percent of that external to the base. In terms of
weights applied, the conditioning compositions will normally be
employed in the range of 0.0005 to 0.5 g./sq. cm., preferably from
0.001 to 0.3 g./sq. cm. and most preferably from 0.005 to 0.2
g./sq. cm.
The preparation of the conditioning composition is easy, usually
requiring only the melting together of various components. They may
be applied to one side of the flexible or form-retaining base by
any suitable method, preferably by roll, doctor blade or spray
application and similarly, if an adhesive is to be employed, it may
be applied to a suitable portion of the base, usually the opposite
major face, in a similar manner. Such methods are detailed in an
application for patent entitled PROCESS FOR THE MANUFACTURE OF
FABRIC CONDITIONING ARTICLE, filed by P. J. Falivene, on the same
day as this application and another application entitled FIBER
CONDITIONING ARTICLE, filed by P. S. Grand, et al., also on the
same day as this application.
After coating of the base with conditioning material, this may be
overcoated with a layer, usually less than 0.01 cm. thick, of wax,
such as petroleum wax, which will be readily removed therefrom in
the dryer and which will aid in preventing adhesion of the
conditioning composition to other materials during storage, such as
fastening to pressure sensitive adhesive with which it is brought
into contact. Of course, instead of the waxy coating, waxed paper,
treated release paper, creped papers, or a plastic, such as
polyethylene film or other suitable material may be used as an
overlay to prevent such adhesion.
The means for holding the coated base to the interior of the dryer
or wall of the container in which fibrous materials are treated may
be any suitable fastener. When using rigid or form-retaining bases,
holding may be by spring loaded clamp, screws, press fitting,
adhesion, partial fusion, taping, typing, or insertion into a
prepared cavity or other enclosure. The place of fastening may be
on any suitable portion of the dryer drum interior, including the
baffles and other locations on the longitudinal surface
thereof.
For the use of flexible bases or substances, it is generally
important that they be fastened to a form-retaining element,
usually the interior of the dryer wall or a baffle thereon. This is
so because in the most desirable uses of the present articles they
will be maintained in position so that they cannot flex unduly and
thereby, flaking off of coating composition will be inhibited. In
some embodiments of the invention, wherein the conditioning agents'
"brittleness" represents no problem, some of the advantages of the
invention can be obtained by fastening such a flexible conditioning
article to the dryer interior wall so that it is held in place
thereon at a point or area but is still capable of flexing.
However, it is highly preferred to maintain the conditioning
article in a form-retaining state during the treatment of fibrous
materials.
The various means mentioned above with respect to holding other
bases to the dryer wall may also be used to hold flexible
conditioning articles. The most preferred means for effecting such
holding is an adhesive and of this type, the best is a pressure
sensitive adhesive. Such adhesive materials are well known, usually
being based on rubber or synthetic organic polymeric plastic
latexes and containing ingredients which keep them tacky, so that
they may be readily applied, with pressure, to a surface and are
subsequently removable therefrom. It has been found that various of
such pressure sensitive adhesives, such as are employed in adhering
masking tapes and bandages or adhesive tapes are useful, even at
the elongated temperatures that are encountered in the automatic
laundry dryer. In the event that any section of such adhesives is
desirable, those will be employed which maintain their adhesive
activity and tackiness or plasticity at the elevated temperature of
dryer operations. Also, those adhesives that are readily removed
and leave no deposits behind after removal will be highly
preferred, since it is desired to maintain the smooth and clean
surface of the dryer interior to avoid staining clothing. Again,
many of the commercially available pressure sensitive adhesives are
satisfactory in this respect. Applications of such adhesive to the
paper or other flexible strips or tapes may be with machinery and
usually is effected after conventional coating of another face of
the base with conditioning composition. The adhesive will usually
be on an entire surface for best holding power but can be spot or
strip printed onto the base.
Although the form-retaining materials normally are fastened to the
surfaces of the dryer drum intermediate the baffles it is often
preferred to mount the flexible tape conditioning articles on the
baffles or other raised portions of the interior of the dryer drum.
Generally, this will be on a leading edge so as to promote best
contact with the materials being conditioned. However, other
locations are also useful. When a relatively long and narrow
conditioning article, such as a tape, is employed, it will
generally be applied longitudinally or coaxially with the drum.
Yet, in some applications it may be applied circumferentially or
partially circumferentially.
After preparation of the conditioning article, it is wrapped or
otherwise packaged for shipment, storage and subsequent use. WHen
pressure sensitive adhesives are employed, care will be taken to
cover the adhesive so that its tackiness is maintained. When
strips, sheets or tapes are used, a good way to protect the
adhesive is to pack the conditioning articles in such a way that
the adhesive contacts either a waxy surface of conditioning
composition, wax coating thereon or waxed paper or other
intermediate protecting film, which thereby acts to protect both
the coated composition and the adhesive. A convenient way to do
this is to roll a strip of such pressure sensitive adhesive
containing conditioning article about a mandrel or tube, to form a
cylinder, such as is illustrated in FIG. 4. If desired, such
cylinder may be mounted on a dispenser or other base and the
conditioning tape may be dispensed in the same manner as is
employed for dispensing other tapes, such as transparent sealing
tapes and masking tapes.
The present articles are simple to employ and the treating methods
are effective for conditioning fabrics without special care being
necessary on the part of the user. The conditioning particle is
positioned in the automatic dryer or tumbling device immediately
before a drying or treating operation commences. The location
selected may be on the drum or a baffle, as previously mentioned or
in such a location on the drum as experience has indicated will
provide the best softening or antistatic treatment with the
conditioning agent being employed. Then, the dryer is started with
a load of damp laundry or other materials to be treated and the
laundry and conditioning article are in relative movement, with a
combination of heat, moisture and abrading action due to contact
causing the release of conditioning agent from article and deposit
on the fabrics. Although it is preferred to use an automatic
laundry dryer, equivalent machines may be employed and in some
instances, heat and drying air may be omitted for part or all of
the cycle, although generally, air will be employed and will be
circulated frequently. Normally there will be about 5 to 50 changes
of drying gas in the dryer drum per minute and the gas temperature
will be from 10.degree. to 90.degree. C., preferably from
50.degree. to 80.degree. C. The dryer will usually revolve at about
20 to 100 revolutions per minute, preferably 40 to 80 r.p.m. The
weight of laundry employed will usually be from 4 to 12 pounds,
preferably from 5 to 10 pounds, dry weight. This will fill 10 to 70
percent of the volume of the dryer, preferably about 30 to 60
percent thereof. Drying will usually take from 5 minutes to 2 hours
and generally from 20 minutes to 1 hour will be sufficient, with
synthetic fabrics, such as nylon, polyesters and synthetic-natural
blends requiring shorter periods of time than cotton laundry. The
synthetics may often be dried satisfactorily in from 3 to 10
minutes and resin-treated fabrics of the permanently pressed or
nonwrinkling types may be dried in from 10 minutes to one-half
hour.
After completion of the conditioning operation and the drying of
the laundry, the conditioning article is examined. If sufficient
softener remains, the article may be left in place and employed
again until complete removal of the coating of conditioning agent.
If the laundry is not satisfactorily conditioned, additional
tumbling thereof may be in order. To obtain different levels of
conditioning activities or different effects, there may be employed
several treating articles or a plurality of different treating
articles, located at various places inside the drum. Of course,
after the coating is consumed, a form-retaining base may be covered
with a new application of conditioning agent and a flexible base,
such as a tape may be removed and discarded.
Other details about the use of the present and related
compositions, articles and methods may be found in an application
for patent entitled FABRIC CONDITIONING METHODS, ARTICLES AND
COMPOSITIONS, filed by G. T. Hewitt, et al., on the same day as the
present application, as well as in the other patent applications,
previously mentioned.
The advantages of the present invention have been indicated but
will be recited briefly here. In summary, it is considered to be
important that the conditioning article is readily locatable in the
dryer at a particular place and that the degree of contact between
it and the tumbling laundry is regulated to a significant extent by
having the article fastened to the dryer interior. Thus, the
article is easy to position and is readily found and removed upon
the completion of the conditioning. The degree of conditioning is
controllable by varying the position and number or size of the
articles on the drum. By utilizing form-retaining articles or by
making them form-retaining by fastening to such a wall or base,
problems of flaking off or cracking of the conditioning agent are
minimized. The various conditioning articles are readily made by
commercially economic processes and, especially with respect to the
tapes, are capable of being continuously mass produced and readily
stored, shipped and dispensed. Although intended primarily for
softening, decreasing electrostatic activity and decreasing
wrinkling of natural and synthetic fabrics, the present articles
may also be used for effecting other treatments of fibers and
fabrics, by having applied active conditioning agents such as
bactericides, fungicides, silicones, sizes, etc., in other suitable
bases, such as waxes, hydrophilic solids, fats, carriers or other
such depositable media.
The following examples illustrate various embodiments of the
invention. Unless otherwise indicated, all parts are by weight,
temperatures are in degrees Centigrade and the measurements are in
the metric system. The examples are not intended to limit the scope
of the invention because it is evident that various modifications
may be made and equivalents may be substituted without departing
from the spirit thereof.
EXAMPLE 1
A melt is prepared by heating 70 parts of stearic monoethanolamide
and 30 parts of stearic diethanolamine to a temperature of about
90.degree. C., while mixing to maintain uniformity of the
composition. The melt is then applied to a sheet of toweling paper,
which is creped, and has a thickness of approximately 0.1 cm.
Application is by means of a roller, dipping into a bath of melt
and depositing a uniform layer of coating composition onto one side
of the toweling. The toweling is approximately 1 meter wide and the
deposit of conditioning agent is to a depth of about 0.05 cm. above
the surface and penetration is to a depth of about 0.015 cm. below
the surface. The penetration is kept low by the rapid cooling of
the melt immediately after coating, which cooling is effected by an
air flow directed onto the coated paper after withdrawal from
contact with the coating roller. Subsequently, a similar coating of
commercial rubber latex adhesive of the pressure sensitive type is
applied to the opposite side of the paper, to a depth of about 0.02
cm., with penetration being about 0.005 cm. The adhesive may be
applied as an emulsion or from a solvent, in either of which cases
solvent or dispersing medium is evaporated therefrom immediately
after application. In those cases where the adhesive requires
heating to effect a cure or when heat is utilized to evaporate
solvent, to prevent melting off of the conditioning agent, the
adhesive may be applied first. The width of paper is cut with a
knife and the cut, treated adhesive paper is wound on individual
spools, each approximately 5 cm. wide, with the lengths of
conditioning tape on the spools being about 10 meters. The spools
are paperboard tubes of approximately 8 cm. outside diameter and
are about 0.4 cm. thick. If used in 20 cm. lengths, each spool
contains enough conditioning tape for 50 applications.
In this preferred embodiment of the invention, the spool of
conditioning tape, containing conditioning composition on one
surface and pressure sensitive adhesive on the other, is mounted on
a dispenser-holder of the type illustrated in FIG. 5. This is
approximately boxed and is ready for shipment, sale and use.
In use, a 20 cm. length of the paper tape is removed from the roll
and is cut by a knife or a serrate edge of the dispenser. It is
then applied to the leading edge of an internal baffle of the
automatic dryer drum in a direction coaxial with the drum. The drum
is then rotated so that the paper is at the top thereof and laundry
to be conditioned is added, after which normal drying cycle is
commenced. The laundry treated is a mixture of wearing apparel and
household articles, totaling eight pounds, including cotton,
synthetic fibers, especially polyesters, polyacetates and blends of
these plastics with each other or with cotton, nylons, rayons and
resin-treated, permanently pressed and wrinkle resistant fabrics.
The wash comprises approximately 50 percent of cotton articles, 20
percent polyester-cotton blends, 10 percent permanently pressed
items, 10 percent nylon articles and the balance of rayon, acetate,
etc. The laundry to be conditioned occupies 40 percent of the dryer
volume and the drying air is blown through the dryer at the rate of
about 200 cubic feet per minute, at an initial temperature of about
70.degree. C. The drum rotates at about a speed of 60 r.p.m.
Initially the temperature of the damp laundry is low, approximately
20.degree. C., but as drying continues, it increases to almost
70.degree. C. The conditioning agent on the surface of the article
is abraded off onto the surfaces of the fabrics being treated, so
that when, after 50 minutes of drying, the machine is turned off
and the laundry is removed, it is static-free and soft to touch,
compared to a similar load in which the conditioning article is not
used. The clothing treated exhibits no spots or stains and periodic
examination of the conditioning article during the operation of the
dryer shows that the coating is held satisfactorily to the base.
There is no flaking or cracking of the conditioning composition
evident.
On examination of the treating tape after use it is found that
approximately 3 grams of conditioning composition have been abraded
from the surface onto the fabrics to be treated. Therefore, the
coated paper contains at least an additional 2 grams of available
conditioning material and can be used again. When it is reused with
another load of laundry and all the coating is abraded from the
surface, only about 1.5 grams of the original 6.5 grams of
conditioning composition remains on the conditioning paper. At that
time the tape is removed and replaced with a fresh strip and the
conditioning operation is repeated with another laundry load.
In other runs, using the same type of coated paper, nylon articles
are removed after 5 minutes and permanently pressed articles are
withdrawn after 15 minutes and are found to be satisfactorily
conditioned, being soft, static-free and wrinkle-free.
When, instead of employing the formula described above there is
used a melt of lauric monoethanolamide and stearic diethanolamide,
also in 30:70 portions, comparable results are obtained. Similarly,
when a solution comprising 30 percent ethanol, 55 percent distearyl
dimethyl ammonium chloride and 15 percent water is employed to coat
the same type of tape at approximately the same weight of
conditioning composition per unit area and the tape is employed as
described above, good softening of cotton and antistatic action on
synthetic organic polymeric textiles are obtained. When synthetic
organic anionic surface active agents, such as sodium lauryl
sulfate and soap, are also used, applied in the same quantities,
either as melts or solutions, to toweling of the type described
above and with the same type of adhesive, they are also found to be
satisfactory in conditioning of the tested laundry. It is generally
observed that additions of plasticizing agents, such as those
described in a patent application filed by P. J. Falivene on the
same day as this application and entitled FABRIC CONDITIONING WITH
IMPROVED COMPOSITION CONTAINING A PLASTICIZER, are useful in
improving even further the nonflaking characteristics of the
conditioning agents, so as to prevent any spotting or staining of
the treated materials.
When the above experiments are repeated, using other means for
holding a strip of coated paper of the same type and size to the
interior of the dryer drum, at a location between baffles, with the
strip extending longitudinally, similar results are obtained. Such
means for holding the strip include transparent sealing tapes,
rubber cements, glues, round head screws with washers, and clamps.
Generally, metal parts are avoided when employing the cationic
conditioning agents, because they sometimes cause stainings by
chemical reactions with metal ions, such as iron ions.
EXAMPLE 2
The experiments reported in example 1 are repeated, using
form-retaining bases of various shapes and sizes held to the dryer
wall in substantially longitudinal disposition at midpoints between
the baffles or ridges. The shapes which are used include cubes,
slabs, cylinders, cylindrical tubes and boxes. All have an external
surface of about 50-300 sq. cm. and most extend from 10 to 30 cm.
across the dryer drum. They are constructed of polystyrene foams,
paperboard or wood.
The conditioning effects obtained are noticeable with all such
form-retaining bases. The clothes treated are softer, of lower
electrostatic action and have fewer wrinkles than do control items.
Of course, better conditioning is obtained from those articles
having greater surfaces from which more conditioning agent is
applied to the laundry. It is noted that there is a lesser tendency
for cracking or flaking of conditioning composition from the
surface of the base when the shape thereof is such that sharp
corners are avoided. After conclusion of the conditioning operation
articles are easily located and removable from the dryer.
* * * * *