U.S. patent application number 13/361935 was filed with the patent office on 2013-08-01 for method for producing wear-resistant images on sandals.
This patent application is currently assigned to SANDALISTA, INC.. The applicant listed for this patent is William Denis Goloveyko. Invention is credited to William Denis Goloveyko.
Application Number | 20130191969 13/361935 |
Document ID | / |
Family ID | 48868933 |
Filed Date | 2013-08-01 |
United States Patent
Application |
20130191969 |
Kind Code |
A1 |
Goloveyko; William Denis |
August 1, 2013 |
METHOD FOR PRODUCING WEAR-RESISTANT IMAGES ON SANDALS
Abstract
A sandal production method includes the application of a primer
applied, preferably by wiping, to the latex or other printing
surface of a sandal blank structure which may be applied and then
wiped from the latex surface. The sandal shaped polymeric mass may
be cut from a sheet of dense polymeric material, it may include
sandal strap bores, and may have layers of flexible paint
(preferably white) applied. A jig is disclosed for providing a
support for multiple primed sandal blanks to save time in the
printing process. Treatment of the printed sandal support with a
protective overlayer is taught.
Inventors: |
Goloveyko; William Denis;
(Long Beach, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Goloveyko; William Denis |
Long Beach |
CA |
US |
|
|
Assignee: |
SANDALISTA, INC.
Los Alamitos
CA
|
Family ID: |
48868933 |
Appl. No.: |
13/361935 |
Filed: |
January 30, 2012 |
Current U.S.
Class: |
2/245 ;
12/142S |
Current CPC
Class: |
A43B 3/128 20130101;
A43D 8/22 20130101; A43B 3/0078 20130101; A43B 3/108 20130101 |
Class at
Publication: |
2/245 ;
12/142.S |
International
Class: |
A43B 23/24 20060101
A43B023/24; A43B 3/12 20060101 A43B003/12; A43D 11/00 20060101
A43D011/00 |
Claims
1. A process of producing a printed sandal support comprising the
steps of: providing a sandal blank having an upper applied surface;
preparing the upper applied surface for printing by applying a
preparatory material chosen from the list consisting of: trisodium
phosphate, dipropylene glycol monomethyl ether, dipropylene glycol
n-butyl ether; wiping the preparatory material from the upper
applied surface; and printing an image upon the upper applied
surface of the sandal blank using a radiation curable ink for form
a printed sandal support.
2. The printed sandal support as claimed in claim 1 and further
comprising the step of attaching a strap set to the printed sandal
support to form a completed sandal.
3. The printed sandal support as claimed in claim 1 and further
comprising the step of applying a protective layer over the printed
upper applied surface of the sandal blank using a flexible
aliphatic urethane.
4. The printed sandal support as claimed in claim 1 and wherein the
step of providing a sandal blank having an upper applied surface is
provided according to the steps of: providing a sheet made of at
least one of heavy polymeric and elastomeric material, the sheet
having an upper side and a lower side; cutting a sandal shaped
elastomeric mass from the sheet, the sandal shaped elastomeric mass
having the upper side and the lower side; and applying an upper
applied surface to the upper side of the sandal shaped elastomeric
mass, to form a sandal blank.
5. The printed sandal support as claimed in claim 4 wherein the
applying an upper applied surface to the upper side of the sandal
shaped elastomeric mass is performed by applying at least one layer
of latex paint to the upper side of the sandal shaped elastomeric
mass, to form the sandal blank.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to improvements in the field
of photographic quality images applied to wear surfaces and more
particularly to a method of high quality image preservation on the
upper wear surface of footwear which will permit inexpensive
customized image placement which is long wearing and highly
resistive to diminution of the image.
BACKGROUND OF THE INVENTION
[0002] Printing on surfaces using a radiation and sometimes UV
curable color inks to produce photographic quality images has been
well known. Most radiation curable inks are used for fresh
substrates which are new, clean, debris free and have surfaces that
are amenable to bonding with radiation curable inks which are
predominantly organic. The process of printing on objects which are
not always fresh and clean is not nearly as well known nor as
uniform as the use of fresh surfaces associated with signage, for
example.
[0003] Few references deal with surface preparation as a problem,
simply because of the fact that radiation curable inks and printers
deal largely with materials and surfaces for which surface
preparation has not been problematic. However, one of the earlier
references outlining the problems in printing on some objects was
"PRIMED SUBSTRATES COMPRISING RADIATION CURED INK JETTED IMAGES"
which issued on Apr. 13, 2004 to Ylitalo, et al., recognizes that
"one problem, however, with radiation curable ink jet inks is that
ink compositions do not uniformly adhere to all substrates," and
discusses the use of primers. Ylitalo recognized that "good wetting
and flow onto various substrates is controlled by the ink/substrate
interaction." The Ylitalo reference cited a number of substrate
treatments including "solvent wiping, blowing, corona, flame and UV
pre-treatment have been suggested in "Practical Considerations for
Using UV Reactive Inks in Piezo DOD Printheads", Richard J. Baker,
Spectra Inc., Hanover, N.H., USA, IS&T's 15th International
Congress on Advances in Non-Impact Printing Technologies (1999), pp
111-115, Conference on Digital Printing Technologies."
[0004] Paraphrasing, the problem faced by Ylitalo involved attempts
to create an overall improvement in print quality as compared to an
unprimed surface, with the result of about 50% to 80% adhesion,
although the unprimed adhesion percentage was omitted. In most
cases, Ylitalo used unprimed support structure surfaces including a
film-forming resin comprising an acrylic resin, a polyvinyl resin,
a polyester, a polyacrylate, a polyurethane and mixtures thereof,
with the acrylic resins, polyurethane resins and mixtures thereof
being preferred.
[0005] Primers used by Ylitalo on such unprimed substrates were
stated to have included cross linked poly(meth)acrylate, a
colorant, a water-based primer composition or a solvent-based
primer composition to at least a portion of a sheet or polymeric
substrate; allowing the water or solvent to evaporate forming a
primed surface; ink jet printing a radiation curable ink
composition on said primed surface; and curing said ink forming an
imaged article. The Ylitalo primer composition was stated as
preferably an acrylic resin, a polyurethane resin, or mixture
thereof. Ylitalo further taught a method comprising applying a
radiation curable primer composition to at least a portion of a
sheet or polymeric substrate forming a primed surface; ink jet
printing a radiation curable ink composition on said primed
surface; and curing said ink forming an imaged article, and
including possibly curing the primer prior to ink jet printing.
Ylitalo was concerned only with durability for outdoor usage, and
thus against weather elements. Ylitalo stated that his primed
surface encourages an ink to diffuse into the primed surface, but
may or may not react with the primed surface.
[0006] However no references have been seen which deal with priming
of a flexible heavy polymeric object upon which a flexible latex
has been applied. The problems encountered with sandals is
many-fold. The base material of the sandal is typically jet-black
hardened polymeric rubber. In order to have a surface which can
show a full color image, it is necessary to provide a white layer
which completely covers any of the black background and which is a
bright white color so that the full range of color intensities can
show through. The material chosen has to be as flexible as sandal
rubber under conditions of normal wear, which will be significant.
The bright white color has to be flexible enough to resist
cracking.
[0007] It has been discovered that a latex layer upon which
radiation curable ink is applied will not be as wear resistant as
desired for sandal applications. The applied image, which will be
nearly fully appear when the sandals are not worn, undergoes
significant and direct wear forces when the sandals are worn by a
user. The purpose for applying a radiation curable ink is for
enhanced appearance and novelty value. However, sandals which have
an applied layer of radiation curable ink and which are worn can
cause the removal of the ink image. Without the ability for a long
lasting, resilient, wear-proof radiation cured ink image, the
practical ability to provide images on sandals will be
impractical.
[0008] Even were the problem of applied ink image solved, the
overall problems associated with manufacturing sandals with applied
ink images has remained. Most radiation cured ink application
machinery is designed for fresh, thin, flat sign material. Some
flatbed printers have vacuum tables to hold the sign material flat
to insure that the focus and distance of the application heads
remains a constant, controlled fixed distance from the surface to
be printed. Thong style sandals are available in a variety of
shapes and thicknesses causing a significant production problem.
Methods and structures which create production efficiency are
needed.
SUMMARY OF THE INVENTION
[0009] A sandal production method includes the application of a
primer applied, preferably by wiping, to the latex printing surface
of a sandal structure. The sandals referred to herein are of the
type characterized by a main lower foot following polymeric mass
with straps which have been known as flip-flop type footwear. The
primer may include trisodium phosphate, dipropylene glycol
monomethyl ether, dipropylene glycol n-butyl ether, and more. These
and other primers may be obtained through commonly available
commercial products containing these and other primers or wiping
solvents, and may include commercially available Savogran 10632 TSP
Liquid Substitute, Savogran 10621 TSP, Klean Strip QKTP06 Tri
Sodium Phosphate Substitute, and Bona Stone Tile and Laminate Floor
cleaner. The primer is applied and then wiped from the latex
surface. It is believed that the mechanism which allows radiation
cured inks to work with a latex surface involves the formation of a
less porus and smoother surface for radiation cured inks to be
deposited. However, it is unclear whether the superior fixation of
the ink to the latex photo deposition surface is through surface
smoothing, leaving of some primer residue to interact with the
radiation cured inks, the promotion of an inter-bond relationship
between the latex and the radiation cured ink and perhaps other
mechanisms not yet identified and not verified.
[0010] In terms of processing to create a sandal, a sandal shaped
polymeric mass may be cut from a sheet of dense polymeric material
having a thickness of from about 1 to 3 centimeters. It may also be
typical for the sandal strap bores (typically three) to be cut
simultaneously or just after the formation of the sandal shaped
polymeric mass. The sheet will typically have a bottom sole pattern
and a top surface which may or may not have been processed to a
smooth closed foam polymeric shape. The top of the sandal shaped
polymeric mass may have a layer of flexible paint (preferably
white) applied, or it may have a white coating or applied structure
of any type. The upper coating or added overlay surface (which may
be a layer of attached material) provides a smoother and more even
surface for printing and provides a more complete covering and
closure for any open foam-type cells or defects in the upper
surface of the sandal shaped polymeric mass. The sandal shaped
polymeric mass with upper applied surface addition can be referred
to as a sandal blank which is ready for printing.
[0011] An improved positioning and hold-down jig is used to provide
a uniform target surface with minimum loss of radiation cured ink,
and conserves machine cycling by providing a wider travel period
for the radiation cured ink jet of a flatbed scanner. A jig can
provide custom fit for several primed sandal blanks to make an
effective elongated travel path for an ink jet printing head.
Because the ink jet printing head is computer controlled, the
printing can produce different styles and patterns across the line
of grouped sandal blanks. The jig further reduces the number of
times that the ink jet printing head stops and restarts per
individual sandal blanks. The jigs also provide a support for
loading and unloading groups of finished, printed sandal members
which will enable workers to load and unload other jigs while the
scanning flatbed printer is printing another set of jigs supporting
many sandal blanks.
[0012] An improved positioning and hold-down jig may have a series
of openings sized to snugly fit the sandal blanks in a
predetermined orientation as closely spaced as the radiation
curable ink printer head will allow in terms of its adjustment time
and isolation of printing of adjacent print targets. Where the jig
has through openings to support the sandal blanks, and especially
where the flatbed printer has a partial vacuum hold down capability
it may be preferable to cover the sandal strap bores of the sandal
blank on its underside to help preserve the partial vacuum hold
down capability of the flatbed printer support. Adhesive tape or
other occluding structure can be used. A jig with through openings
helps in removal of the printed sandal base after printing.
[0013] A closed back jig can be used, but causes some extra care to
keep the closed space in which the sandal blank will be placed in a
clean, debris free state. Further, care should be taken in removal
of the printed sandal support from the closed back jig as removal
might be more difficult. The printing process takes a few minutes
and thus it is possible for one worker to load the flatbed printer
and then unload the printed sandal supports from the jigs and
reload the jigs with sandal blanks with time left over before the
printing cycle is finished.
[0014] An overlayer, such as can be applied as a finishing layer
over the top surface of the printed sandal support. The use of an
overlayer can assist in a number of areas. First, any fixable layer
which overlies the radiation cured ink will help protect it against
direct wear. Second, where it is desired to give a surface effect
to the printed sandal support, including both the ink and non-ink
areas a covering layer is useful. The covering layer can have its
own particulate suspension, including color, reflective glitter,
and the like. In addition, where the ink design is not made to
cover the entire surface of the printed sandal support, a covering
layer will help seal the outer edges of the design where it lies
adjacent un-coated upper surface areas. A coating overlayer can
include a flexible aliphatic urethane.
[0015] If an overcoating is used, it may be applied to the printed
sandal support while it is supported by or once it has been removed
from the support jig. Once the printed sandal supports, with or
without an overcoating have been removed from the jig, a tool can
be used to insert the sandal straps into the strap openings in
sandal support to form a completed & finished sandal.
[0016] The inventive methods herein can be utilized to produce a
custom sandal having photographic quality images including
photographs, logos and art work. It is possible to produce a custom
sandal for one customer having photos of his or her choice and
which can be made alongside a number of sandals having corporate
logos or made as gifts and party favors.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The invention, its configuration, construction, and
operation will be best further described in the following detailed
description, taken in conjunction with the accompanying drawings in
which:
[0018] FIG. 1 is a perspective view of an underside of an sheet of
sheet of heavy polymeric or elastomeric material having a tread
pattern underside and from which a sandal shaped elastomeric mass
is cut leaving a central sandal shaped void;
[0019] FIG. 2 is a perspective view of the sandal shaped
elastomeric mass of FIG. 1 and illustrating an overlayer which may
be a series of layers of flexible latex paint to completely cover
the sandal shaped elastomeric mass;
[0020] FIG. 3 is a plan view of a view of the sandal shaped
elastomeric mass of FIG. 2 having an upper coating which may
preferably be a latex coating, and shown undergoing surface
preparation with the use of a spray nozzle and wipe cloth;
[0021] FIG. 4 is a plan view of a jig having sandal shaped openings
to support sandals in a pre-specified, known orientation and having
an easily checked flat upper profile to help workers to visually
inspect for a flat printing profile;
[0022] FIG. 5 is a schematic downward view looking down upon the
top of a flat-bed printer and illustrates the use and placement of
a jig and illustrates two sandal blanks loaded into the jig and
ready for the printing operation to begin;
[0023] FIG. 6 is a sectional view taken along line 5-5 of FIG. 5
and illustrating a cross section of a sandal blank or printed
sandal support held in the jig and showing the pair of rear strap
bores as having chamfered lower openings; and
[0024] FIG. 7 illustrates a plan view of a completed printed sandal
with prominent images and sandal strap set applied.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0025] Referring to FIG. 1, a sheet of heavy polymeric or
elastomeric material 21 having a thickness of from about 1 to 3
centimeters is seen from its underside. A tread pattern underside
23 is seen and may be any pattern appropriate for a sandal which
may provide some anti-slip characteristic. A central sandal shaped
void 25 remains after cutting and removal of a sandal shaped
elastomeric mass 27 having a top side 29 facing the viewer of FIG.
1. Also seen are a series of three sandal strap bores including a
forward strap bore 31 and a pair of rear strap bores 33. The bores
will preferably have an expansion chamfer on the bottom side (not
seen in FIG. 1) opposite top side 29. The cut-out and formation of
the sandal shaped elastomeric mass 27 may be such that bores 31 and
33 and any expansion chamfers on the bottom side (not seen in FIG.
1) may be formed in a single process operation.
[0026] Referring to FIG. 2, a perspective view of the sandal shaped
elastomeric mass 27 shows it has having an upper applied surface 39
of preferably bright white color and which may be provided as an
additional overlayer applied to the top side 29 of the sandal
shaped elastomeric mass 27 seen in FIG. 1. The upper applied
surface 39 may be a surface possibly of a plurality of layers of
coatings of which three are seen as layers 41, 43, and 45, or
simply one such upper layer of material 45. The three layers 41,
43, and 45 may also preferably be three layers of a flexible,
white, latex paint. A white upper surface 39 will enable printing
to be performed in an array of colors, as all colors can be derived
by printing. Starting with a white upper applied surface 39 enables
a printer to form a pattern with same or better quality that a
pre-printed upper layer of material 45 might be acquired.
[0027] It may also be that applying a flexible latex paint in
layers will improve the flexibility and resiliency and brightness a
resulting upper top side 29. It may be possible for a single layer
45 to be utilized provided it has sufficient thickness of a
sufficient opaque quality to block out any light or brightness
absorbing effect of the material from which the sandal shaped
elastomeric mass 27 is formed. In any event the upper top side 29
seen in FIG. 2 should be sufficient in terms of brightness and
flexibility, for printing. It makes no difference for the purposes
of further discussion whether a number of layers 41, 43, and 45 or
a single layer form the top side 29.
[0028] Referring to FIG. 3, a plan view of a view of the sandal
shaped elastomeric mass 27 of FIG. 2 having an upper coating of at
least one of layers 41, 43, and 45 which coating may preferably be
a latex coating or other suitable surface applied to and forming
part of the top side 29 represents a sandal blank 51 ready for
surface treatment, and may be referred to as a sandal blank 51. It
is expected that the sandal blank 51 may be available to some image
printers in this form, with layers 41, 43, and 45 or at least one
bright white layer 45 ready for printing. Sandal blank 51 is shown
in a position for undergoing surface preparation where necessary or
desirable. Surface preparation may include a spray mechanism 53 for
applying a thin layer of a surface preparation solution, such as a
liquid 55, over preferably a wide area of the sandal blank 51.
After initial application of liquid 55 and preferably while the
upper applied surface 39 is still wet with the liquid 55, a wiping
structure 55 which may be a cloth, paper towel, sponge, squeegee or
other structure is used wipe the upper applied surface 39. The
wiping action provides some swiping pressure to the upper applied
surface 39, provides cleaning to upper applied surface 39 and also
helps remove any debris from the upper applied surface 39. The
wiping action may leave some residue by evaporation action to help
a radiation cured ink bond with upper applied surface 39. All
aspects of the mechanism of applying and wiping may not be fully
known, but the results have been effective in providing a higher
adhesion of the radiation cured inks.
[0029] After the wiping operation seen in FIG. 3, the sandal blank
51 is ready for printing. Most of the radiation cured ink printing
occurs on a flat bed scanner (to be shown) with a printing housing
which moves back and forth in raster fashion as moves minutely
forward and advances a front of a series of thin lines of color
radiation cured ink across a surface to be printed, which in this
case is the upper applied surface 39. However, precise printing of
photographic quality images requires a sandal blank 51 upper
applied surface 39 which has a consistent and known orientation on
the flat bed support of the flat bed scanner (not yet shown).
Further, the height of the surface to be printed must also be
controlled. Referring to FIG. 4, it has been discovered that one
structure which can supply this stability and consistency is a
sandal blank 51 support jig 61. Support jig 61 may preferably have
a height thickness which matches the height thickness of the sandal
blanks 51 it will support.
[0030] The jig 61 has a series of openings including a large
openings 63 for large size sandal blanks 51, a small size openings
65 for medium size sandal blanks 51, and a medium size openings 67
for medium size sandal blanks 51. Now the openings 63, 65 and 67
are arranged in pairs for illustration purposes but need not be so
arranged. Different sizes are shown on the jig 61, but a given jig
61 need not have but one size. The numbers of openings 63, 65 and
67 in a given jig 61 can be numerous. Jig 61 is shown as having
opposite ends 71 which are shown in broken line format to represent
the fact that jig 61 can be much longer in either direction with
such lengths containing additional openings 63, 65 and 67. Jig 61
is shown as having a side 73 which is shown in broken line format
to represent the fact that jig 61 can have further rows containing
additional openings 63, 65 and 67.
[0031] The openings 63, 65 and 67 can have any pre-determined
orientation, including a densely packed orientation which minimizes
the material between the openings 63, 65 and 67. The consideration
in making a more densely packed jig 61 with seemingly more random
arrangement of the openings 63, 65 and 67 is the material from
which jig 61 is constructed and to insure that the printing control
software can be made to accommodate. The considerations in a design
of a jig 61 are thus the material of construction, the overall
size, and the savings which can result from a printer of a given
size, as well as the investment I a larger size printer. The use of
a stronger material will enable more closely spaced openings 63, 65
and 67 but may create handling problems relating to bending and
breaking, as well as a combined loaded handling weight, including
sandal blanks 51.
[0032] Referring to FIG. 5, an overhead schematic view of a
flat-bed printer 81 is shown. The flat-bed printer 81 has a support
table 83 and may have various size and shape openings (not shown)
for introducing a partial vacuum to assist in hold down of any
object placed on the flat-bed printer 81. The flat-bed printer 81
portion shown is isolated to a central portion and a pair of sides
85 are shown in broken line format to represent that the support
table 83 and other associated structures may exist a wide distance
away from the portions of the support table 83 shown, as well as to
eliminate the need to show details of motion control housings at
the far ends of the support table 83.
[0033] The support table 83 may preferably have a positioning stop
rail 87 against which the jig 61 may be positioned to ensure that
the jig 61 can be located in a constantly identified rearward
position when placed upon the support table 83. Lateral stop
members may also preferably be used but are not shown in order to
simplify the explanation and would be normally located beyond the
central portion of the flat-bed printer 81 illustrated in FIG.
5.
[0034] Near the top of FIG. 5, a pair of support rails 89 are seen
as supporting a radiation curable ink printer head housing 91.
Printer head housing 91 may be preferably equipped with a
multi-color printer head and with at least one radiation curing
light source. In a typical setup, the printer head housing 89 moves
back and forth along the pair of support rails 89. The pair of
support rails 89, by virtue of other motion control structures
located beyond the pair of sides 85 and is not shown in FIG. 5. The
pair of support rails 89 move in a direction toward or away from
the positioning stop rail 87 to position the printer head housing
89 for the next movement along the support rails 89.
[0035] The result is a raster action with the main motion occurring
by the printer head housing 91 as a reciprocating motion which
occurs along the support rails 89 sufficient to overlie the width
of sandal blanks 51. The minor motion occurs by lateral movement of
the pair of support rails 89 to prepare the printer head housing 89
for its next reciprocating sweep, and this lateral movement of the
support rails 89 movement is typically very small, on the order of
from one half to three millimeters per completed reciprocation of
the printer head housing 89 along the pair of support rails 89. In
a typical setup, the lateral movement of the pair of support rails
89 will start at one side of the table 83, and either closer to or
farther from the positioning stop rail 87, for example, until all
of the surface to be printed that is present is printed.
[0036] Referring to FIG. 6, a cross section of the jig 61 shown in
FIG. 4 and taken along line 5-5 is shown. The jig 61 is shown has
having had two of its large openings 63 loaded each with a sandal
blank 51 and ready for printing. Jig 61 has a generally planar
upper side 93 and a generally planar lower side 95. Note that the
upper applied surface 39 is seen as preferably flush with respect
to the generally planar upper side 93 of the jig 61. The jig 61
openings could be closed along the bottom side, thus providing an
enclosure on three sides for supporting the sandal blank 51, but it
is believed to be preferable to use openings 63, 65, 67 to be
through openings. A first disadvantage a closed bottom jig is that
the personnel loading the sandal blanks 51 would not be continually
pushing against a thin wall at the rear of the jig 61, and possibly
encounter debris there. A second disadvantage is that the unloading
of a printed sandal support from the sandal blank 51 would involve
trying to lift a secured body that may preferably be generally
flush with the top of the jig 61 causing printing personnel to
either have to resort to prying the secured body out or trying to
engage one of the forward strap bores 31 or pair of rear strap
bores 33.
[0037] There are a number of advantages to having through openings
63, 65, and 67. First it enables printing personnel to more readily
remove the printed sandal supports (not yet shown) by pushing them
up and out of the openings 63, 65, 67 once printing is completed.
Second, no debris can collect as there is no closed space. Third,
when the jig 61 is loaded onto the flat-bed printer 81, the
printing personnel can visually inspect the upper side 93 of the
jig and make sure that it is flush with the upper applied surfaces
39 of the sandal blanks 51 prior to printing. Any sandal blank 51
which is not flush can be pressed down until it is flush or else be
quickly removed as a defective sandal blank 51.
[0038] Controlling the height of the radiation cured ink ejector
over the printing surface is important to producing a high quality
printed sandal support. A upper applied surface 39 of a sandal
blank which is too close or too far from the expected distance from
the ink ejector will produce a blurred or uneven image. FIG. 6 also
illustrates that each of the pair of rear strap bores 33 includes a
chamfer 97 at the lower opening of the bores 33. The strap bores 31
have a chamfer 97 also but it cannot be seen in FIG. 6. The chamfer
97 will accommodate a sandal strap button (not shown) which will
act to stably hold a sandal strap set in place. It is realized that
a vacuum applied to the bottom of the view of FIG. 6 would result
in a sacrifice of the vacuum due to air being drawn through the
forward strap bore 31 (not shown in FIG. 6) and pair of rear strap
bores 33. The simple expedient of covering the lower chamfer 97
openings with a weakly engaging masking tape or equivalent will
prevent any loss of vacuum force due to the forward strap bore 31
and a pair of rear strap bores 33, and is easily removed.
[0039] It is preferable for the openings 63, 65, and 67 of the jig
61 to be sized for a slight interference fit with the appropriately
sized sandal blanks 51 in order that the jig 61 can be loaded and
support the sandal blanks 51 while the jig 61 is being moved onto
and off of flat-bed printer 81. Even where the degree of
interference fit will vary from one of the openings 63, 65, and 67
to another, the interference fit should be sufficient to hold the
sandal blank 51 stably and until it is forced from the jig from the
underside.
[0040] At the upper right of FIG. 6, spray nozzle 99 is shown and
delivering a liquid to form a covering layer 101 to form covering
layer to the upper applied surface 39 after the printing process
has occurred. Covering layer 101 may be an aliphatic urethane, or
similar material. Commercially available urethane products may
include JFB Hart HP300 Aliphatic Urethane, Gemini Aliphatic
Urethene Exterior Clear, Benjamin Moore Super Spec Aliphatic
Acrylic Urethane Gloss, Sherwin Williams Diamond Clad Urethane
Clear Coat, and PPG Pitthane 95-8800 Acrylic Aliphatic Urethane.
Further, it may be advantageous to perform this covering layer
while the printed sandal supports resulting from the printing of
the sandal blanks 51 while they remain in position within jig 61.
The provision of an integrated flat surface made up of upper
applied surface 39 which has just been printed and flush to
generally planar upper side 93 of the jig 61 may facilitate
application of a covering layer 101. Further, in some instances it
may be preferable to apply a liquid to form the covering layer 101
by brush or roller. The use of the jig 61 while applying a covering
layer 101 would help combat drips or otherwise exposure of the
sides of the printed sandal blank 51 to the liquid forming the
covering layer 101.
[0041] Referring to FIG. 7, a completed printed sandal 111 is
illustrated. A printed sandal support 113 is shown with a sandal
strap set 115 attached to form the completed sandal 111. A number
of images 117 and 119 are seen as having been applied to the upper
applied surface 39. It is expected that the sharpness and integrity
of the images 117 and 119 will withstand foot pressure, upper
applied surface 39 compression and deformity throughout a
significant portion of the completed sandal lifetime.
[0042] While the present invention has been described in terms of a
method of manufacturing a sandal with a wear-resistant, long
lasting and high resolution graphic, and in particular an
adjustable scale manufacturing method which enables an efficient
manufacturing technique for both custom and long runs of
production, the techniques described herein are applicable in a
wide variety of production surroundings. The invention presents
improvements in both printing, indexing of a product to be printed,
and sandal production, as well as techniques for producing a high
quality sandal product.
[0043] Although the invention has been derived with reference to
particular illustrative embodiments thereof, many changes and
modifications of the invention may become apparent to those skilled
in the art without departing from the spirit and scope of the
invention. Therefore, included within the patent warranted hereon
are all such changes and modifications as may reasonably and
properly be included within the scope of this contribution to the
art.
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