TW575489B - Method for forming double-density multilayered-type EVA foam - Google Patents

Abstract

A method for forming a double-density multilayered-type EVA foam comprises: separately mixing EVA (ethylene vinyl acetate copolymer), talc powder, cross-linking agent, and rubber, etc. with a foaming agent at pre-determined ratios of different amounts to form two or more than two sheet foams of different densities; alternately or sequentially stacking the sheet foams of a different densities in a mold and performing a vulcanization formation to form a multilayered-type EVA foam product with suitable antislipperiness and wear resistance; after being cut into a desired dimension and ground by a sand wheel, waxed, colored, and sprayed with a lacquer, a product with layers due to different densities has greatly improved value and appearance.

Description

575489 V. Description of the invention (1) < Industrial use range > The present invention is a method for forming an EVA double-density multi-layer foam, especially it can be formed with appropriate anti-slip properties, financial properties, and obvious Layered EVA foam. < Background of the Invention > According to the presently known EVA foam (please refer to the block diagram of the first conventional EVA foam and the second schematic diagram of the conventional EVA foam), which consists of A predetermined proportion of EVA (ethylene vinyl acetate copolymer), a foaming agent, a bridging agent, and a colorant are mixed and stirred to make it foam into a sheet-like body (la) with color, and then the sheet-like body (la) is laminated Vulcanization molding is performed in the mold to form an EVA foam finished product (1) having a laminated color form, and then cut into an appropriate size according to the article molded by the person. When the conventional EVA foam is made as described above, when it is made into the sole (A) of the shoe (please refer to the three-dimensional view of the shoe made of the conventional EVA foam) because of the anti-slip property of the EVA foam And abrasion resistance is poor, so a rubber layer (2) needs to be pasted on the bottom. In addition, although it has a layered color form, it is not good in value and aesthetics because it is a foam. Flat, waxed and painted with bright lacquer, because the density is the same, the surface roughness is the same, so the formation of a single color without layering, can not greatly improve its sense of value and aesthetics. Furthermore, although the wooden heels (3) on the market are also layered (as shown in the three-dimensional view of a shoe made of a conventional wooden heel in Figure 4), they are made of sheet wood (3a) by adhesion Agent (3b) is laminated and bonded, then polished by a grinding wheel, colored and sprayed on the moon; it is made of light paint, so it is not environmentally friendly, and it is easy to fall off when in water.

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Short life, complex processing procedures and high cost. In view of the ideas of the above-mentioned inventions, the inventors have revised and improved the design in many ways, and introduced the present invention <Objective of the Invention> Knowing the lack of EVA foam, they tried to discuss and try a sample test, and also η η

The main purpose of the present invention is to provide a method for forming an EVA double-density multi-density 4 foam, and the formed EVA foam has appropriate ^ second slip and abrasion resistance. When the sole of a shoe is made, A rubber layer needs to be added at the bottom, and the formed EVA foam is smoothed by a grinding wheel, colored and sprayed with bright lacquer. Due to different densities and different surface roughness, it can show obvious levels Sense, and greatly enhance its sense of value and aesthetics. <Exemplary embodiments> The rest of the present invention will be described in detail as follows: as shown in the fifth block diagram of the present invention and the sixth block diagram of the present invention. As shown in the flow chart of 2 μ ', it is a combination of EVA (ethylene acetate copolymer), talc, bridging agent, and rubber (approximately 10%) in predetermined proportions. The foaming agent is mixed and stirred, and the proportion of the A and B parts of the foaming agent is about 1.2, which makes it foam into a sheet body with high and low rain density (丨 丨), ()

2) Next, the sheet-like bodies (11) and (12) with two kinds of densities and low densities are overlapped in a mold with a pattern on the surface and vulcanized to form a plastic, and a multi-layer with appropriate slip resistance and wear resistance is formed. Finished EVA foam (10), and because it is added with talc, it can fill the pores to obtain a smoother surface. As shown in the seventh perspective view of the shoe made by the present invention, when it wants to make the sole (B) of the shoe, it is cut to the required size with a cutting device, and then

575489 V. Description of the invention (3) The grinding wheel is smoothed, waxed and colored and sprayed with bright lacquer, which shows a clear sense of layering according to different densities and different surface rough chain degrees, thereby greatly improving its sense of value and aesthetics. In addition, because the bottom surface has a proper pattern, and it has appropriate slip resistance and wear resistance, it is not necessary to stick a rubber layer to the bottom. As shown in the eighth figure, the block diagram of the other embodiment of the present invention and the ninth As shown in the schematic flow chart of another embodiment of the present invention, it is a mixture of raw materials such as EV A (ethylene vinyl acetate copolymer), talc, and bridging agent in predetermined proportions with the foaming agents in the A and B parts, respectively. Stir, the proportion of the A and B parts of the foaming agent is about 1: 2 to make it foam into high and low density sheet-like bodies (2 1), (2 2), and then high and low two The flaky bodies of density are overlapped and vulcanized in the mold to form a multi-layer EVA foam product (20), and because of the addition of talc, it can fill the pores and obtain a smoother surface. As shown in the tenth figure, a perspective view of a shoe made by another embodiment of the present invention, when it is going to make the sole (C) of a shoe, it is cut to a required size with a cutting device, and a rubber layer is stuck on the bottom. (50), and then polished by a grinding wheel, waxed, colored and sprayed with a bright lacquer, corresponding to different densities and different surface roughness, showing a clear sense of layering, and then greatly improving its sense of value and aesthetics. Figure 11 shows a block flow diagram of another embodiment of the present invention and Figure 12 shows a schematic flowchart of another embodiment of the present invention. It is a predetermined proportion of EVA (ethylene vinyl acetate copolymer), talc and Cross-linking agent is mixed with the foaming agents in the A and B parts respectively, and the proportion of the foaming agents in the A and B parts is about 1: 2 to make it foam into a sheet body of high and low density (3 1 )

575489 V. Description of the invention (4) and (32), then the high-low and low-density sheet bodies are stacked in a staggered manner and folded appropriately after being placed in a mold and vulcanized to form a staggered multi-layer EVA The finished product of foam (30), and because it is added with talc, it can fill the pores and get a smoother surface. As shown in the thirteenth view of a shoe made in another embodiment of the present invention, when it is going to make the sole (D) of a shoe, it is cut with a cutting device to a required size, and a rubber is stuck on the bottom. The layer (50) is then smoothed by a grinding wheel, colored by waxing, and spray-painted with varnish. According to different densities and different surface roughnesses, it shows a staggered layered sense, which greatly enhances its sense of value and aesthetics. As shown in the block flow chart of another embodiment of the present invention in FIG. 14 and the flow chart of another embodiment of the present invention in FIG. 15, it is a predetermined proportion of EVA (ethylene vinyl acetate copolymer), talc Raw materials such as powder and bridging agent are mixed and stirred with a plurality of different amounts of foaming agents to make them foam into a sheet of various densities (4 1), and then the sheets are stacked from bottom to top according to their density. Sulfur is formed in the mold, and a multi-level EVA foam finished product (40) from shallow to deep is formed, and because of the addition of talc, it can fill the pores and obtain a smoother surface. As shown in the sixteenth figure, a perspective view of a shoe made according to yet another embodiment of the present invention, when the sole (E) of the shoe is to be made, it is cut into a required size with a cutting device, and a rubber is stuck on the bottom Layer (5 G), and then smoothed by a grinding wheel, waxed, colored and sprayed with bright lacquer. It responds to different densities and different surface roughness, and presents a sense of layering from light to deep, thereby greatly improving its sense of value and aesthetics. By.

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575489 Brief description of the diagram <Simple description of the diagram> The first diagram: a block flow diagram of the conventional EVA foam. The second figure is a schematic flow chart of a conventional EVA foam. The third picture is a perspective view of a shoe made of a conventional EVA foam. The fourth picture: a perspective view of a shoe made of a conventional wooden heel. Fig. 5 is a block flow chart of the present invention. Figure 6: Schematic diagram of the process of the present invention. The seventh figure: a perspective view of a shoe made by the present invention. FIG. 8 is a block flowchart of another embodiment of the present invention. Fig. 9 is a schematic flowchart of another embodiment of the present invention. Tenth figure: is a perspective view of a shoe made by another embodiment of the present invention. Figure VIII-is a block flow diagram of another embodiment of the present invention. FIG. 12 is a schematic flowchart of another embodiment of the present invention. The thirteenth figure is a perspective view of a shoe made according to another embodiment of the present invention. Fig. 14 is a block flow chart of still another embodiment of the present invention. Fig. 15 is a schematic diagram of the flow of another embodiment of the present invention. Fig. 16 is a perspective view of a shoe made according to another embodiment of the present invention. 〈Illustration of drawing number〉 10… ..EVA foam 11 ........ High-density sheet 12.12..Low-density sheet 20 ..... EVA foam 21 ... Shaped body 22 ... Low-density sheet body 30 ... EVA foam 31 ... High-density sheet body 32 ... Low-density sheet body 40 ... EVA foam Body 41 ..... sheet body 50 ..... rubber layer

575489 Schematic illustration B ... sole D ... sole C ... 7¾ E ... sole 1111111 page 10

Claims (1)

575489 VI. Scope of patent application &lt; Scope of patent application &gt; 1. A method for forming an EVA double-density multi-layer foam. A method is to use a predetermined proportion of EVA (ethylene vinyl acetate copolymer), talc, and bridge. The raw materials such as agent are mixed and stirred with the foaming agents in the A and B parts respectively, so that they are foamed into high and low density sheets, and then the high and low density sheets are overlapped in the mold. Vulcanization molding, and multi-level EVA foam products are formed. 2. The molding method of the EVA double-density multi-layer foam as described in item 1 of the scope of the patent application, wherein the proportion of the A and B parts of the foaming agent is 1: 2. 3. According to the molding method of EVA double-density multi-layer foam described in item 1 of the scope of patent application, it can also add 10% rubber to the raw material. 4. The molding method of EVA double-density multi-layer foam as described in item 1 of the scope of the patent application, wherein high- and low-density sheet-like bodies can also be stacked in a staggered manner and appropriately folded and placed in a mold. Sulfur molding is used to form a staggered multi-layer EVA foam product. 5. The molding method of EVA double-density multi-layer foam as described in item 1 of the scope of the patent application, wherein the raw materials can also be mixed and stirred with a plurality of different amounts of foaming agents to foam them into tablets of various densities. The sheet-shaped body is stacked in a mold from bottom to top and vulcanized according to the density of the sheet-shaped body, and a multi-layered EVA foam body finished from shallow to deep is formed.