CA1180521A - Method of producing footwear welt - Google Patents
Method of producing footwear weltInfo
- Publication number
- CA1180521A CA1180521A CA000402297A CA402297A CA1180521A CA 1180521 A CA1180521 A CA 1180521A CA 000402297 A CA000402297 A CA 000402297A CA 402297 A CA402297 A CA 402297A CA 1180521 A CA1180521 A CA 1180521A
- Authority
- CA
- Canada
- Prior art keywords
- sole portion
- sole
- flange
- welt
- outer sole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/08—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
- B29D35/081—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by injection moulding
- B29D35/082—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by injection moulding injecting first the outer sole part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/08—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
- B29D35/085—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by compression moulding, vulcanising or the like
- B29D35/087—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by compression moulding, vulcanising or the like forming first the outer sole part
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A two-layer sole is molded onto the bottom of a lasted upper by molding a first color outer sole with a recess in the top thereof, molding a second color inner sole to fill the recess, the inner sole including a flange which covers the outer sole and extends slightly outwardly from the periphery thereof between the outer sole and the upper, coloring the flange a third color, and removing a portion of the flange so that the resulting sole appears to include an outer layer, a midsole and a separate welt.
.
A two-layer sole is molded onto the bottom of a lasted upper by molding a first color outer sole with a recess in the top thereof, molding a second color inner sole to fill the recess, the inner sole including a flange which covers the outer sole and extends slightly outwardly from the periphery thereof between the outer sole and the upper, coloring the flange a third color, and removing a portion of the flange so that the resulting sole appears to include an outer layer, a midsole and a separate welt.
.
Description
- ~18~5Zl This invention relates to a method of producing a sole for an article of footwear, and in particular to a method of pro-ducing a footwear sole wi-th a simulated separate welt.
In general, the welt portion of an article of footwear i5 made separately from the remainder of the artlcle, and attached to the sole at the junction between the sole and upper. Simulated welts have also been molded integral wi-th plastic, e.g. polyvinyl chloride soles, the welts being the same color as the remainder of the sole. It is also possible to dye or pain~ the top portion of the simulated welt so that the welt appears to be separate from the remainder of the sole.
The object of the present invention is to provide a rela-tively simple-method for producing a two-layer footwear sole with a simulated welt. The finished product has the appearance of a two-layer sole with a separate welt, even though the welt is a portion of the inner layer of the sole.
Accordingly, the present invention relates to a method of producing a footwear sole with a simulated welt comprising the steps of:
(a) molding an outer sole portion on a mold bottom;
(b) placing a lasted upper above said outer sole portion and mold bottom;
(c) molding an inner sole portion between said first sole portion and lasted upper to connect the outer sole portion to the upper, with a flange integral with said inner sole portion extending outwardly beyond the periphery of said outer sole portion, said flange including a simulated welt;
(d) coloring said flange between the upper and the outer sole portion; and 52~
(e) removing a portion of said flanye, whereby the remainder of the flange resembles a welt and a midsole above sa,d outer sole portion.
The invention will now be described in greater detail with reference to the accompanying drawings, which illustrate a preferred embodiment of the invention, and wherein:
Figure 1 is a longitudinal sectional view of a mold for molding an outer sole portion, Figure 2 is a cross-sectional view taken generally along line II-II of Fig, l;
Figure 3 is a longitudinal sectional view of a mold for producing an inner sole portion; and Figure 4 is a cross-sectional view taken generally along line IV-IV of Fig. 3.
I~ith reference to Figs. 1 to 4 of the drawings, a footwear sole is produced using a first mold cavity 1 defined by a top mold 2 and a bottom mold 3, which may be a vertically movable mold piston (Figs. 1 and 2). The mold cavity 1 is filled with a plastic material such as polyvinyl chloride or polyure-thane through injection orifice (not shown) to produce a firstor outer sole portion 5. The outer sole portion 5 includes a bottom tread surface 6 î a vertical side wall 7 and a cavity 8 in the top thereof. The mold is opened, i.e. the top mold 2 is removed, leaving the bottom mold 3 and the outer sole portion 5 together.
A second mold cavity (Figs. 3 and 4) is produced using the bottom mold 3 and the outer sole portion 5, a pair of side molds 10, and a last 11 with an upper 12 thereon. Plastic material is ~' 5~
injected into the second mold cavity to produce an inner sole portion 13 conneccing the outer sole portion 5 ~o the upper 12.
The only area of the inner sole portion 13 which appeaxs in the finished product is a flange 14 between the upper 12 and top edge 15 of the outer sole portion 5. The flange 1~ is in the shape of a conventional welt, including a convex bead 16 with outwardly extending, generally V-shaped grooves therein, and a rectangular bottom shoulder 17 extending outwardly ~herefrom.
The side molds 10 used to mold the inner sole portion 13 include cavities 18 of sufficient depth that the should~r 17 projects outwardly beyond the vertical side wall 7 of the outer sole portion 5.
A~ter the article of footwear has been removed ~rom the second mold, the flange 14 is colored, i.e. dyed or painted. Then, the outer peripheral edge of the shoulder 17 projecting outwardly beyond the side wall 7 of the outer sole portion 5 is removed, so that the side edge of the shoulder 17 is flush with the side wall 7 of the outer sole portion 5. If the sole portion 5 and 13, and the paint used on the shoulder 17 are three dif~erent colors, the result is a two layer sole with a simulated welt between the top surface of the upper layer and the bottom edge of the upper 12 around the entire periphery of the article of footwear. Thus, the expense of producing and,applying a separate welt is avoided.
When the plastic used in the above described method is polyurethane, an expansion cavity 19 must be provided in the bottom mold 3. The cavity 1~ extends around the entire periphery of the sole cavity, and prevents the lmproper molding of the second sole la~er During molding of the outer sole portion 5, the polyurethane expands through a narrow passage 20 into the cavity 19. The polyurethane ring 21 filling the cavity 19 and the thin web 22 ~ - 3 -s~
of polyurethane connectiny the riny 21 to the outer sole portion S remain on the bottom mold 3 during molding of the inner sole portion 13 to prevent the entry of the polyurethane of the inner sole portion 13 into the.area between the peripherv of outer sole portion 5 and the side of the mold cavity in the bottom mold 3. The ring 21 and the web 22 are removed at the same time as the excess portion of shoulder 17.
.
~ .
~ 4 -. , . ~
In general, the welt portion of an article of footwear i5 made separately from the remainder of the artlcle, and attached to the sole at the junction between the sole and upper. Simulated welts have also been molded integral wi-th plastic, e.g. polyvinyl chloride soles, the welts being the same color as the remainder of the sole. It is also possible to dye or pain~ the top portion of the simulated welt so that the welt appears to be separate from the remainder of the sole.
The object of the present invention is to provide a rela-tively simple-method for producing a two-layer footwear sole with a simulated welt. The finished product has the appearance of a two-layer sole with a separate welt, even though the welt is a portion of the inner layer of the sole.
Accordingly, the present invention relates to a method of producing a footwear sole with a simulated welt comprising the steps of:
(a) molding an outer sole portion on a mold bottom;
(b) placing a lasted upper above said outer sole portion and mold bottom;
(c) molding an inner sole portion between said first sole portion and lasted upper to connect the outer sole portion to the upper, with a flange integral with said inner sole portion extending outwardly beyond the periphery of said outer sole portion, said flange including a simulated welt;
(d) coloring said flange between the upper and the outer sole portion; and 52~
(e) removing a portion of said flanye, whereby the remainder of the flange resembles a welt and a midsole above sa,d outer sole portion.
The invention will now be described in greater detail with reference to the accompanying drawings, which illustrate a preferred embodiment of the invention, and wherein:
Figure 1 is a longitudinal sectional view of a mold for molding an outer sole portion, Figure 2 is a cross-sectional view taken generally along line II-II of Fig, l;
Figure 3 is a longitudinal sectional view of a mold for producing an inner sole portion; and Figure 4 is a cross-sectional view taken generally along line IV-IV of Fig. 3.
I~ith reference to Figs. 1 to 4 of the drawings, a footwear sole is produced using a first mold cavity 1 defined by a top mold 2 and a bottom mold 3, which may be a vertically movable mold piston (Figs. 1 and 2). The mold cavity 1 is filled with a plastic material such as polyvinyl chloride or polyure-thane through injection orifice (not shown) to produce a firstor outer sole portion 5. The outer sole portion 5 includes a bottom tread surface 6 î a vertical side wall 7 and a cavity 8 in the top thereof. The mold is opened, i.e. the top mold 2 is removed, leaving the bottom mold 3 and the outer sole portion 5 together.
A second mold cavity (Figs. 3 and 4) is produced using the bottom mold 3 and the outer sole portion 5, a pair of side molds 10, and a last 11 with an upper 12 thereon. Plastic material is ~' 5~
injected into the second mold cavity to produce an inner sole portion 13 conneccing the outer sole portion 5 ~o the upper 12.
The only area of the inner sole portion 13 which appeaxs in the finished product is a flange 14 between the upper 12 and top edge 15 of the outer sole portion 5. The flange 1~ is in the shape of a conventional welt, including a convex bead 16 with outwardly extending, generally V-shaped grooves therein, and a rectangular bottom shoulder 17 extending outwardly ~herefrom.
The side molds 10 used to mold the inner sole portion 13 include cavities 18 of sufficient depth that the should~r 17 projects outwardly beyond the vertical side wall 7 of the outer sole portion 5.
A~ter the article of footwear has been removed ~rom the second mold, the flange 14 is colored, i.e. dyed or painted. Then, the outer peripheral edge of the shoulder 17 projecting outwardly beyond the side wall 7 of the outer sole portion 5 is removed, so that the side edge of the shoulder 17 is flush with the side wall 7 of the outer sole portion 5. If the sole portion 5 and 13, and the paint used on the shoulder 17 are three dif~erent colors, the result is a two layer sole with a simulated welt between the top surface of the upper layer and the bottom edge of the upper 12 around the entire periphery of the article of footwear. Thus, the expense of producing and,applying a separate welt is avoided.
When the plastic used in the above described method is polyurethane, an expansion cavity 19 must be provided in the bottom mold 3. The cavity 1~ extends around the entire periphery of the sole cavity, and prevents the lmproper molding of the second sole la~er During molding of the outer sole portion 5, the polyurethane expands through a narrow passage 20 into the cavity 19. The polyurethane ring 21 filling the cavity 19 and the thin web 22 ~ - 3 -s~
of polyurethane connectiny the riny 21 to the outer sole portion S remain on the bottom mold 3 during molding of the inner sole portion 13 to prevent the entry of the polyurethane of the inner sole portion 13 into the.area between the peripherv of outer sole portion 5 and the side of the mold cavity in the bottom mold 3. The ring 21 and the web 22 are removed at the same time as the excess portion of shoulder 17.
.
~ .
~ 4 -. , . ~
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of producing a footwear sole with a simulated welt comprising the steps of:
(a) molding an outer sole portion on a mold bottom;
(b) placing a lasted upper above said outer sole portion and mold bottom;
(c) molding an inner sole portion between said first sole portion and lasted upper to connect the outer sole portion to the upper, with a flange integral with said inner sole portion extending outwardly beyond the periphery of said outer sole portion, said flange including a simulated welt;
(d) coloring said flange between the upper and the outer sole portion; and (e) removing a portion of said flange, whereby the remainder of the flange resembles a welt and a midsole above said outer sole portion.
(a) molding an outer sole portion on a mold bottom;
(b) placing a lasted upper above said outer sole portion and mold bottom;
(c) molding an inner sole portion between said first sole portion and lasted upper to connect the outer sole portion to the upper, with a flange integral with said inner sole portion extending outwardly beyond the periphery of said outer sole portion, said flange including a simulated welt;
(d) coloring said flange between the upper and the outer sole portion; and (e) removing a portion of said flange, whereby the remainder of the flange resembles a welt and a midsole above said outer sole portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000402297A CA1180521A (en) | 1982-05-05 | 1982-05-05 | Method of producing footwear welt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000402297A CA1180521A (en) | 1982-05-05 | 1982-05-05 | Method of producing footwear welt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180521A true CA1180521A (en) | 1985-01-08 |
Family
ID=4122711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000402297A Expired CA1180521A (en) | 1982-05-05 | 1982-05-05 | Method of producing footwear welt |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1180521A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0787577A1 (en) * | 1996-02-02 | 1997-08-06 | NORDICA S.p.A | Method for producing shoe soles by injection-molding |
-
1982
- 1982-05-05 CA CA000402297A patent/CA1180521A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0787577A1 (en) * | 1996-02-02 | 1997-08-06 | NORDICA S.p.A | Method for producing shoe soles by injection-molding |
| US5955017A (en) * | 1996-02-02 | 1999-09-21 | Nordica S.P.A. | Method for producing shoe soles by injection-molding |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |