MXPA00011110A - Method to fabricate a shoe with a foamy insole. - Google Patents

Abstract

The present describes a method for the fabrication of a shoe, in which it is prepared a pre-form insole (11, 21, 31, 31Æ, 31ÆÆ, 51) having a periphery portion, a sole (12, 23, 33, 33Æ, 33ÆÆ, 53) having an adhesive applied to the upper part of it is placed in an assembly mould (1, 2, 3, 3Æ, 4, 5) including at least two opposite parts of lateral moulds (102, 103, 204, 205, 305, 306, 305Æ, 306Æ, 403, 502, 503) having shape patterns to form the peripheral portion of the pre-form insole, the pre-form insole is placed in the assembly mould adjacent to the upper part of the sole while the pre-form insole is softened by heat means until acquiring a plastic state, the pre-form insole is pressed against the sole and is adhered to the same, and the peripheral portion of the pre-form insole is pressed and stamped by means of lateral mould parts, the pre-form insole union and the sole and stamping of the peripheral portion of the pre-form insole are carried out simultaneously when closing the asse mbly mould.

Description

METHOD FOR MAKING A SHOE WITH A FOAM TEMPLATE BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This invention relates to a method for manufacturing a shoe, more particularly, to a method for manufacturing a shoe in which the preform of a foamed insole is made in a stamped and finished template during the assembly of the template preform and other components. of the shoe, like a shovel and a sole.

DESCRIPTION OF THE TECHNIQUE It is common to produce shoes with insoles made of flexible foaming materials, such as ethylene-vinyl acetate (EVA) foams, which have a good softness to offer a comfortable feeling and have a good flexibility to absorb the impacts These templates can be manufactured by making an EVA foamed composition inside a mold or by making a template preform cut from a preformed EVA cast into a mold. When making the stencils, they generally adhere to the blades and soles by means of gluing procedures. In the manufacture of many sports shoes, the foamy insoles are given relief-like patterns on their edges before they stick to the shovels and soles. For example, in the patent of E.U.A. No. 5,843,352 property of the owner of this application reveals a method to produce EVA insoles with decorative peripheral edges. This method employs the steps to separately make a template and a preform strip, making the preform strip with the desired silhouette using an engraved pattern, and gluing the engraved strip to the periphery of the template by bonding it with an adhesive. Republic of China Patent No. 287091 issued to Jih et al shows a method for making a foamy EVA insole, characterized in that a template preform cut of an EVA casting plate is foamed in a hot mold and forms a finished template that has a peripheral wing that projects upwards to stick the decorative strip. The presence of the peripheral wing in the template facilitates the gluing of the decorative strip. In the patent of E.U.A. No. 5,560,877 issued to Yong et al, the process for the manufacture of an EVA sole is shown, characterized in that a non-foamed EVA preform plate is placed in a first mold unit to make a frothy stencil preform that at its Once it is placed in a second hot mold to make a template with engraved finish.

All the procedures shown in the aforementioned patents require the first step to make a template preform and the second step of engraving or decorating the template preform to form a finished template structure. These patents hardly show or teach how a template is made and molded before having the template or other components of the shoe, such as shovels and soles. The patent of E.U.A. No. 5,463,824 issued to Barna et al. Suggests a method for manufacturing an arch support system for a shoe. The teachings of said patent are directed to the gluing of a foamed layer for the component of a shoe with other layers of material different from the components of a shoe, by applying heat and pressure in a mold. The process shown in this patent relates only to the method of gluing and is absolutely irrelevant with respect to the stamping or etching of a foamed layer. Also, the patent of E.U.A. No. 4,231, 169 issued to Toyama et al shows a gluing method that is independent of the pattern realization of a shoe component. In the method shown there, a bobbin composed of a fiber reinforced resin plate is placed on the element of a template and adhered to it with heat and pressure. While the prior art suggests various methods available for gluing and stamping the shoe components, the gluing and stamping of the shoe components is generally carried out in separate operational steps that are laborious and time-consuming. It is convenient that the gluing and stamping of the shoe components is carried out simultaneously in order to facilitate and accelerate the production of shoes.

BRIEF DESCRIPTION OF THE INVENTION One purpose of the present invention is to provide a simplified and improved method of making a shoe with a foamed insole formed with decorative peripheral patterns around the bottom of a blade. Another purpose of the present invention is to provide an improved method for making a shoe characterized in that the decoration of a template preform is performed simultaneously with the gluing of the template preform to a spade or sole. According to the present invention, a method for manufacturing a shoe comprises: preparing a template preform having upper and lower surfaces and a peripheral portion extending around the upper and lower surfaces; the application of an adhesive on the upper part of a sole; the placement of the sole to which an adhesive has been applied in an assembly mold including at least two opposite side mold portions with shape patterns to make the peripheral part of the template preform; the placement of the template preform in the assembly mold by arranging the lower surface adjacent to the upper part of the sole while the template preform is softened by means of heat to a plastic state; and pressing the template preform into plastic mixing against the sole to adhere the template preform and the sole, and pressing and stamping the peripheral part of the template preform by means of the side mold portions, where the preform is pasted. of template and sole, and stamping of the peripheral part of the template preform are carried out simultaneously upon closing the assembly mold. 10 BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiment in relation to the accompanying drawings, of which: Figure 1 is a perspective showing a template preform and a sole to be assembled in a first embodiment of the method according to the present invention; Figure 2 is a perspective view showing an assembly mold used in the first embodiment of the present invention; Figure 3 is a perspective view showing the insole preform and the sole mounted in accordance with the first embodiment of the present invention; ^ MMMMMiiMÜÉ-t Figure 4 is a perspective view illustrating the assembly of a spade and a template preform in an assembly mold in accordance with the method of the second embodiment of the present invention; Figure 5 is a cross-sectional view of a decorative strip for sticking to the upper and the template preform in the second embodiment; Figure 6 is a cross-sectional view showing the decorative strip, the blade and the template preform assembled according to the second embodiment; Figure 7 is a perspective view illustrating the assembly of a blade, a template preform and a sole in an assembly mold in accordance with a third embodiment of the present invention; Figure 8 is a cross-sectional view of an assembly mold of the third embodiment in the closed position; Figure 9 is a perspective view illustrating the manufacture of a sandal through an assembly mold in accordance with a fourth embodiment of the present invention; Figure 10 is a schematic view of the sandal mounted in the fourth embodiment when the assembly mold is closed; Fig. 11 is a schematic cross-sectional view showing an alternative assembly mold for the manufacture of a sandal; and Figure 12 is a schematic cross-sectional view illustrating the assembly of a sole and a template preform including an air chamber in accordance with a fifth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY With respect to Figures 1, 2 and 3, a first preferred embodiment of the method for manufacturing a shoe in accordance with the present invention is directed to the assembly of a foamed insole preform 11 and a sole 12. The foamed insole preform 11 is prepared from an EVA polymer in a conventional manner, as well as making a foamed EVA composition with the silhouette of a template in a suitable mold, or adapting a preformed EVA foam. The foamed insole preform 11 is substantially flat and has upper and lower surfaces surrounded by a peripheral portion 110. The dimensions of the upper and lower surface of the foamed template preform 11 are slightly larger than the dimensions of the upper surface of the sole 12. An assembly mold 1 used in this embodiment includes a lower mold part 101 for positioning the sole 12, two opposite side mold portions 102 and 103, and finally an upper mold part 104. The side mold portions 102, 103 are provided with shape patterns 102 ', 103' to form the peripheral portion of the template preform 11.

During the operation, an adhesive, such as a meltable glue, is applied to the upper surface of the sole 12, and the sole 12 covered with the glue is placed in the lower mold part 101. The template preform 11 is it softens by means of heat until it acquires a plastic state and is placed in the assembly mold 1, while in the plastic state, with the lower surface of the template preform 11 in contact with the upper surface of the sole 12. The peripheral portion of the template preform 11 projects outwardly from the periphery of the sole 12. The decorative pieces 111 having different colors are placed in the side mold parts 102, 103. The decorative pieces 111 can be made of the same material as the template preform 11 or a different material. In this embodiment, the decorative pieces 111 are of the same material as the template preform 11 and are preferably heated to a plastic state before being placed on the side mold parts 102, 103. When the assembly mold 1 is closed, in the plastic state of the template preform 11, the template preform 11 is pressed against the sole 12 and stuck thereto. At the same time, the peripheral portion of the template preform 11 is pressed to project upwards and is stamped thanks to the side mold portions 102 ', 103', and the decorative pieces 111 placed in the side mold portions 102, 103 they are glued to the peripheral portion of the template preform 11, as shown in Figure 3. Due to the shape patterns 102 ', 103' of the side mold portions 102, 103, a relief pattern is produced in the peripheral portion of the template preform 11. Alternatively, the two side mold portions 102, 103 of the mold 1 can be replaced with a simple one-piece mold part having an opening of the mold cavity on the two upper sides of the mold. bottom of it. In this case, the lower mold part 101 is fitted on the underside of the single mold part in a single piece. With respect to Figure 4, in a second embodiment of the method for manufacturing a shoe in accordance with the present invention, a foamed insole preform 21 and a blade 22 are assembled using an assembly mold 2. Foamy template preform 21 differs of the template preform 11 in which the peripheral portion of the template preform 21 has a raised peripheral flange 211. The assembly mold 2 includes an upper mold part 201, a pair of holding presses 202, 203, two parts of opposite side mold 204, 205, and a lower mold part 206. The inner surfaces of the side mold portions 204205 are provided with shape patterns for printing the peripheral raised wing 211 of the template preform 21. The blade 22 is placed in the upper mold part 201 after an adhesive is applied to the lower part of the blade 22. The preform of template 21 is heated to a plastic state and placed in the assembly mold 2 with the upper surface thereof in contact with the lower part of the blade 22. The peripheral raised wing 211 of the template preform 21 extends around of the lower part of the blade 22. With respect to FIGS. 5 and 6 in combination with FIG. 4, a decorative strip 23 is placed around the peripheral raised wing 211 of the template preform 21 by means of fastening elements or cords 231 that join the decorative strip 23 with the template preform 21. The decorative strip 23 is of the same material as the template preform 21 and is heated to a plastic state before being placed in the assembly mold 2. When the assembly mold 2 is closed, the template preform 21 and the decorative strip 23, which are in the plastic state, are pressed and stamped and adhere to the lower part of the blade 22. In this way, the peripheral raised wing 211 of the template preform 21 is stamped and decorated with the decorative strip 23. With respect to Figure 7, a third embodiment of the method for manufacturing a shoe in accordance with the present invention is proposed for mounting a blade 32, a template preform 31, and a sole 33. In this embodiment, the template preform 31, in the plastic state, is placed in an assembly mold 3 together with the blade 32 and the sole 33 with an adhesive . The assembly mold 3 includes a lower mold part 301, an upper mold part 302, left and right holding presses 303, 304 and a pair of side mold parts 305, 306 are interior surfaces provided with shape patterns 305" , 306. " When the mold 3 is closed, the blade 32, the template preform 31 and the sole 33 are assembled together. At the same time, the template preform 31 is given a final desired shape with the peripheral raised wing 311 thereof, engraved and stamped. Note that the assembly mold 3 has guard plates 307, 308 adjacent the upper end of the side mold portions 305, 306. The guard plates 307, 308 are designed as curved elongated strips to conform to the contour of the blade 32. When the mold 3 is closed, the lower ends of the protection plates 307, 308 abut the top of the peripheral raised wing 311 of the template preform 31, as shown in Figure 8, so that the flash produced of the template preform 31 does not travel upward and deviate outwardly from the guard plates 307, 308. In this manner, no flash formation will occur around the template preform 31 after assembly. The flash that forms out of the protection plates 307, 308 can be easily removed. With respect again to FIG. 7, during the forming operation in the assembly mold 3, front and rear protective plates 331, 332, which are arranged at the front and back ends of the sole 33 at the points corresponding to the front and back joints of the two side mold parts 305, 306, are adhered to the front and back ends of the blade 32 and the insole 31. Cracks that are formed in the arrest plates 331, 332 due to the joints The front and back of the side mold parts 305, 306 can be removed, if desired, by pressing and stamping the cracks with a hot etching tool.

Figures 9 and 10 illustrate a fourth embodiment of the method for making a sandal. In this embodiment, a template preform 31 'is provided with holes 311' in the margin thereof. The blade 32 'includes a variety of sandal straps 321' attached with fasteners 322 '. After the belts 321 'pass through the holes 311' in the template preform 31 'which has been heated, the fastening elements 322' are connected to each other, thus joining the blade 32 'and the jig 31'. The blade 32 'and the jig 31' are then placed between an upper mold part or mold 302 'and right and left fastening portions 303', 304 'as shown in FIG. 10 Fig. 10. When the assembly mold 3 'is closed by joining the upper mold part 302, the left and right clamping presses 303', 304 ', the side mold parts, 305', 306 ', and a part of lower mold 310 ', the blade 32' and the insole 31 'are integrated into a sole 33 *. With respect to figure 11, instead of the assembly mold 15 mentioned above 3 ', another mold having mold and die mold members for the manufacture of a sandal can be used. A mold part 4 is provided with an opening in the cavity 401 on one side of the mold part 4. After inserting a down mold member 402 into a blade 32 ', the down mold member 402 together with the blade 32" 20 are placed in the cavity 401. A template 32"and a sole 33" are then placed on the blade 32"The mold part 4 is closed with a mold cover 403 for mounting the template 31", the sole 33" and the blade 32". -a ^ MÉkwutUua-i With respect to Figure 12, in a fifth embodiment of the present invention, an air chamber 54 is added to the preform of a jig 51 during the assembly of the template preform 51 and a sole 53 in an assembly mold 5. The sole 53 is first placed in an upper mold 504, and the template preform 51, which is heated to a plastic state, is placed on the sole 53. The air chamber 54 is then placed the template preform 51 and is covered with a cover 52 which is made of the same material as the template preform 51. When the assembly mold 5 is closed by moving the side mold portions 502, 503 and a lower mold part 501 towards the upper mold part 504, the cover 52 is attached to the template preform 51, enclosing the air chamber 54 in the middle, and the template 51 and the sole 53 are joined together. When the air chamber 54 is inflated by the injection of air through an air passage 56 after the assembly mold 5 is closed, the template preform 51 and the cover 52 are compressed to abut the inner surface of the side mold portions 502, 503. As a result, a clear pattern is etched into the peripheral portion of the template preform 51. The product, as designed, has good impact absorption characteristics due to the presence of the air chamber 54. Shoes having impact absorption properties can be manufactured by incorporating a polyurethane foam (PU) to a template in place of the air chamber 54. In the In manufacturing, a foaming liquid PU material is introduced into a mold between a sole and a template. Prior to the introduction of the foamed PU material into the mold, air is introduced into the mold in the middle of the sole and the template to create a space between them. At the same time, the peripheral portion of the template preform in the plastic state is compressed to abut the inner surface of the mold. The foamy PU material is introduced into the space as soon as air is no longer introduced. A clear etching pattern can be formed in the peripheral portion of the template preform. While the present invention has been described with respect to what is considered the preferred and most practical embodiment, it is understood that this invention is not limited to the embodiment shown but attempts to cover several adjustments included within the meaning and field of the broadest interpretation in order to cover all the equivalent modifications and adjustments.

Claims (17)

NOVELTY OF THE INVENTION CLAIMS

1. - A method for manufacturing a shoe including the preparation of a template preform having upper and lower surfaces and a peripheral portion extending around the upper and lower surfaces, and the application of an adhesive to the upper part of a sole , characterized by: the placement of the sole to which an adhesive has been applied in an assembly mold including at least two opposite side mold parts having shape patterns to form the peripheral portion of the aforesaid template preform; the placement of the template preform in the aforementioned assembly mold with the lower surface disposed adjacent to the upper part of the sole while the template preform is softened by means of heat until a plastic state is obtained; and the pressure of the template preform in plastic state against the sole to join the insole preform and the sole, and the pressure and embossing of the peripheral portion of the aforementioned template preform by means of the mold parts, characterized in that the The joining of the insole preform and the sole and the stamping of the aforementioned peripheral portion of the insole preform are carried out simultaneously upon closing the aforementioned assembly mold.

2. - The method according to claim 1, further characterized in that the peripheral portion of the aforementioned template preform is recorded to form a relief type pattern.

3. The method according to claim 2, further characterized in that the upper and lower surfaces of the template preform have dimensions greater than those of the aforementioned sole so that the peripheral portion of the template preform extends outwards exceeding the periphery of the sole when the template preform is placed on the sole, pressing the peripheral portion of the template preform by means of the aforementioned mold parts to project upwards and to create said relief pattern in the peripheral portion.

4. The method according to claim 2, further characterized in that said peripheral portion of the said template preform has a raised peripheral wing, the peripheral wing being pressed and formed by the side mold parts to create the relief pattern in the peripheral wing mentioned.

5. The method according to claim 3, further characterized in that it comprises applying an adhesive to the lower part of a blade, and placing said blade in the assembly mold with the lower part of the blade in contact with the blade. the upper surface of the template preform before the assembly mold is closed, characterized in that said peripheral portion is pressed against the lower part of the blade and formed by means of the two lateral mold parts to create said relief type pattern .

6. The method according to claim 4, further characterized by comprising the application of an adhesive to the bottom of a blade, and the placement of said blade in the aforementioned assembly mold with the lower part of the blade in contact with the upper surface of the template preform and being surrounded by the said peripheral wing before the assembly mold is closed, characterized in that the peripheral flange of the template preform is pressed and formed with the two side mold parts to create the relief type pattern.

7. - The method according to claim 6, further comprising comprising the preparation of a decorative element, the placement of said decorative element in the assembly mold around the peripheral flange of the template preform before the mold is closed of assembly, and the pressure of said decorative element against the peripheral wing of the template preform to join said decorative element to the peripheral wing and create the relief type pattern.

8. The method according to claim 7, further characterized in that said decorative element is made of the same material of the template preform.

9. The method according to claim 7, further characterized in that said decorative element is configured as a strip, said strip having fastening elements for the placement of the strip around the peripheral flange of the template preform before it closes the assembly mold.

10. The method according to claim 7, further characterized in that said decorative element includes a variety of decorative pieces placed around the peripheral flange of the template preform before the assembly mold is closed.

11. The method according to claim 1, further comprising comprising the steps of placing an air chamber in the template preform, and the placement of a cover, which is made of the same material as the template preform in said air chamber before the assembly mold is closed, the pressure passage of the cover against the template preform to join said cover and the template preform when closing the assembly mold, thus enclosing the air chamber , and the step that consists in inflating said air chamber in order to compress the template preform and the cover against the assembly mold upon closing said assembly mold.

12. The method according to claim 5, characterized in that said blade includes a variety of sandal cords.

13. The method according to claim 1, characterized in that said assembly mold further includes a lower mold part for the placement of the sole, and an upper mold part opposite said lower mold part, including the part of upper mold a mold.

14. The method according to claim 13, further characterized in that the lower mold part is a piece 5 separated from the opposite side mold parts.

15. The method according to claim 12, further characterized in that the assembly mold includes a lower mold part for the placement of the sole, and an upper mold part with a cavity for the placement of the blade, said part of mold 10 above a part of the descendant mold for the placement of the sandal cords.

16. The method according to claim 5, further characterized in that the assembly mold further comprises a lower mold part for the placement of the sole, and a mold part 15 upper for the placement of the blade, said upper mold part including a last and protective plates, said dividing plates being arranged in the lower part of the upper mold part and extending towards the upper ends of the side mold parts opposite in order to block the upper end of the peripheral portion of the preform 20 of the template, further characterized in that the resulting burr of said template preform can be deflected to extend outwardly from the protection plates. "-" •. * «-» - «..-» -.

17. A method for manufacturing a shoe including the preparation of a template preform having upper and lower surfaces and a peripheral portion extending around the upper and lower surfaces, and the application of an adhesive to the underside of a blade , characterized by: the positioning of the blade to which an adhesive has been applied in an assembly mold including at least two opposite side mold portions having shape patterns to form the peripheral portion of the template preform; the placement of the template preform in the assembly mold with the upper surface adjacent to the lower part of the blade while the template preform is softened by means of heat until it acquires a plastic state; and the pressure of the template preform in said plastic state against the said blade to join the template preform and the blade, and the pressing and stamping of the peripheral portion of the template preform by means of the side mold portions, characterized in addition, because the joining of the template preform and the blade and the stamping of the peripheral portion of the template preform are carried out simultaneously upon closing the assembly mold.