U.S. patent number 3,849,949 [Application Number 05/295,842] was granted by the patent office on 1974-11-26 for roll of pressure sensitive adhesive, adhesive coated abrasive discs and dispenser.
This patent grant is currently assigned to Minnesota Mining & Manufacturing Company. Invention is credited to Eugene L. Baratto, Armin H. Steinhauser.
United States Patent |
3,849,949 |
Steinhauser , et
al. |
November 26, 1974 |
ROLL OF PRESSURE SENSITIVE ADHESIVE, ADHESIVE COATED ABRASIVE DISCS
AND DISPENSER
Abstract
A convolutely wound roll of pressure-sensitive adhesive coated
abrasive discs is wound on a core without a protective release
liner. A dispenser suitable for individually dispensing the
abrasive discs from the roll having a severing edge substantially
narrower than the diameter of the discs to be dispensed and
registering means for insuring that adjacent discs are separated at
their line of tangency to form abrasive discs.
Inventors: |
Steinhauser; Armin H. (St.
Paul, MN), Baratto; Eugene L. (White Bear Twp., Ramsey
County, MN) |
Assignee: |
Minnesota Mining &
Manufacturing Company (St. Paul, MN)
|
Family
ID: |
23139439 |
Appl.
No.: |
05/295,842 |
Filed: |
October 10, 1972 |
Current U.S.
Class: |
451/538;
225/38 |
Current CPC
Class: |
B65D
83/0882 (20130101); B24D 11/008 (20130101); B65H
35/0026 (20130101); Y10T 225/237 (20150401) |
Current International
Class: |
B24D
11/00 (20060101); B65D 83/08 (20060101); B65H
35/00 (20060101); B24d 011/00 () |
Field of
Search: |
;51/406 ;225/38 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Simpson; Othell M.
Attorney, Agent or Firm: Alexander, Sell, Steldt &
DeLaHunt
Claims
What is claimed is:
1. An abrasive disc product comprising a convolutely wound
concatenation of coated abrasive discs having disposed on the side
opposite the coated abrasive a pressure-sensitive adhesive, each of
said discs being joined to at least one other disc along a
perforated line substantially tangent to the discs and said line
being less than half the radius of the discs and with the adhesive
coating placed in releaseable contact with the abrasive coating to
maintain the wound roll and permit easy separation and application
of the discs.
2. The coated abrasive product of claim 1 wherein said
pressure-sensitive adhesive is an acrylate copolymer.
3. The coated abrasive product of claim 2 wherein said acrylate
copolymer is isooctylacrylate-acrylic acid copolymer.
Description
BACKGROUND OF THE INVENTION
This invention relates to abrasive discs having a coating of
pressure-sensitive adhesive on the back thereof and, in one aspect,
to a dispenser for dispensing pressure-sensitive adhesive discs
from a continuous roll of discs.
The prior art discloses a strip or ribbon comprising a first strip
in the form of a chain of abrasive discs having a
pressure-sensitive adhesive thereon and a second strip of flexible
material covering the adhesive and being releasably adhesively
bonded to the first strip. The resulting laminate is convolutely
wound to form a roll which can be separated into individual
laminated abrasive discs. Additionally, the prior art shows a
dispensing device suitable for individually dispensing the abrasive
discs and for retaining the release liner separated from said disc,
see U.S. Pat. No. 3,267,623. Such a roll of discs and the
dispensing means, while allowing the user to obtain a plurality of
discs in a continuous roll, requires the additional expense of
having a flexible covering to protect the adhesive coating and the
additional trouble associated with separating the covering from the
adhesive backing on the coated abrasive discs. Also, while such
discs can be dispensed with the disclosed dispenser, the dispensing
means does not have means for registering each disc with
relationship to the cutting bar to insure that individual discs are
severed from the roll.
BRIEF SUMMARY OF THE INVENTION
It has been found that a roll of pressure-sensitive coated abrasive
disc segments can be formed without the use of a flexible liner for
protection of the disc or adhesive, and discs from such a roll can
be indexed and dispensed individually without the trouble of having
to sever and remove a layer of release liner. The abrasive roll of
this invention comprises a concatenation of pressure-sensitive
adhesive-coated abrasive discs connected with at least one other
disc at a line of tangency, the concatenation of discs being
convolutely wound to form a roll which can be easily unrolled. A
dispensing device which has a severing edge substantially narrower
than the greater width of the discs and having on each end of said
severing edge a registering member will insure that individual
discs are separated from the concatenation of discs at the line of
tangency between adjoining discs. The dispenser allows the easy and
quick dispensing of the abrasive discs from the roll in the form of
individual pressure-sensitive coated discs without the delay and
mess caused by a protective liner.
BRIEF DESCRIPTION OF THE DRAWING
A further understanding may be had by reference to the accompanying
drawing in which:
FIG. 1 is a perspective view of a roll of abrasive disc segments
mounted in the dispensing device of this invention;
FIG. 2 is an elevational view in partial section of the device of
FIG. 1;
FIG. 3 is a vertical sectional view taken along the line 3--3 of
FIG. 2; and
FIG. 4 is a plan view of a portion of a concatenate of abrasive
discs forming a roll in accordance with this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the accompanying drawing in which like reference
numerals refer to like parts, a convolutely wound roll of abrasive
discs 10 is rotatably mounted upon a supporting shaft 12 within a
dispensing unit 13. A core 14 about which the roll of discs have
been convolutely wound is retained on the shaft 12 by a wall 15
within the dispenser 13 and by friction retaining means in the form
of a spring-loaded ball 16. The supporting shaft 12 is mounted
within the case 18 and extends either direction from the wall 15,
there being sufficient space in the case as shown to mount two
rolls of convolutely wound abrasive discs thereby allowing more
than one grade or type of abrasive disc to be available in the
dispenser simultaneously. It is possible to form dispensing units
having only one or more than two rolls of convolutely wound
abrasive discs, the exact number of rolls in a dispenser depending
on the number of grades and types of abrasive disc needed in each
dispenser.
For ease of carrying a handle 20 is mounted on top of the
three-sided frame of the dispensing device making movement from
place-to-place within a working area very convenient. A standard 23
projects from the frame in spaced relationship to the shaft 12 to
allow a roll of discs to be easily placed on the shaft. The
standard 23 supports a knife, forming a cutting edge 24, at its
free edge and has a projection 26 placed on each end of the cutting
edge 24 which project above said edge to define disc registering
means which index the individual discs in the roll. A smooth
surfaced retention member 22 is mounted on the standard 23 between
the cutting edge 24 and the roll of abrasive discs 10 to retain the
disc on the end of the roll in a position to be easily reached. The
successive discs 25 will remain in contact with the retention
member 22 because of the pressure-sensitive adhesive disposed on
the abrasive disc opposite the surface having abrasive granules
disposed thereon. When it is desired to separate a disc from the
roll of discs, the disc desired to be separated is brought forward
over the projecting registering means and then down toward the
cutting edge 24. The projections 26 will prevent an abrasive disc
from being separated from the adjoining disc until the width of the
disc between the projections 26 is equal to or less than the width
of the cutting edge 24 exposed by the projections. By properly
regulating the registering means 26, it is possible to form a
spacing which insures that adjoining discs are separated only at
the line of tangency where the adjacent discs meet. The cutting
edge 24 is shown held in place by screws 21 which allow the removal
of a worn cutting blade and its replacement with a new blade. The
cutting edge may be permanently or removeably mounted using a
variety of fastening means, e.g., metal screws, nut and bolt,
rivet, etc.
FIG. 2 shows a sectional view of the roll of pressure-sensitive
coated abrasive discs 10 mounted on the supporting shaft 12. The
roll 10 is held in place by the retaining means. When all of the
abrasive discs have been dispensed, it is a simple matter to force
the core 14 over the ball 16 and slide the core 14 off of the
shaft, and insert a new roll of adhesively coated abrasive discs on
the shaft 12.
In FIG. 3 an abrasive disc 30 is shown resting on the smooth
retaining member 22 which supports the disc 30 in a position to be
easily grasped when it is desired to separate the disc from the
roll 10. In FIG. 4 a plurality of discs 25 are shown which are
joined along perforated lines substantially tangent to the discs.
The lines are not longer than one-half the radius of the discs and
maintain the discs 25 in a concatenatious configuration with the
discs joined at the lines or necks 28. The length of the cutting
edge 24 exposed by the registering means 26 will generally be about
the same width as the width of the necks 28 between the discs 25
thereby insuring that successive discs will be severed at the neck.
The registering means 26 will align the neck 28 in proper index
with the cutting edge 24 and also retain the neck in the proper
position as the disc being dispensed is separated from the roll.
The registering means, by holding the neck at the proper place for
separation, allows separation of the discs using only one hand,
there being no need to manually hold the roll or the disc with the
neck in position to be severed. This is in contrast to prior art
devices where no means are provided for holding the neck in the
proper position and the discs must be manually indexed thereby
requiring the use of two hands.
The dispenser of this invention is useful for dispensing a variety
of items which can be produced in roll form. The items to be
dispensed can be of irregular shape, the rear portion of one item
being joined to the front portion of the succeeding item, the
individual items having a neck, which is substantially narrower
than the width of the remainder of the item in order to provide an
area for indexing the item to be severed with relationship to the
severing edge.
The abrasive discs of this invention can be formed from a wide
variety of well-known coated abrasive products such as cloth, or
paper-backed coated abrasives. The coated abrasive products used
will have a flexible backing material which allows the abrasive to
be convolutely rolled into a roll of abrasive disc segments.
Pressure-sensitive adhesives useful for coating disc are known in
the art. Examples of such adhesives being vinyl ethers, acrylates,
and rubber resin disclosed in U.S. Pat. Nos. Re.24,906; 2,485,295;
etc. The presently preferred adhesives, because of their extended
shelf life and resistance to detackifying under atmospheric
conditions, are arcylic copolymer adhesives disclosed in U.S. Pat.
No. Re.24906. One example of such an acrylic copolymer is a
95.5:4.5 isooctylacrylate:acrylic acid copolymer. Such a copolymer
can be coated on the back of a concatenate of coated abrasive disc
segments as a solution in heptane:isopropanol solvent and the
heptane:isopropanol solvent evaporated leaving a pressure-sensitive
adhesive having an extended life.
Various modifications and alterations of this invention may become
obvious to those skilled in the art; it is to be understood,
however, that the scope of this invention is not to be limited to
the specific illustrative examples or materials described herein
but includes those changes coming within the scope of the appended
claims.
* * * * *