CN1087575A

CN1087575A - The direct foaming of ethylene-vinyl acetate copolymer integral forming method of sole

Info

Publication number: CN1087575A
Application number: CN 92114152
Authority: CN
Inventors: 庄明智
Original assignee: JUSHANG ENTERPRISE CO Ltd
Current assignee: JUSHANG ENTERPRISE CO Ltd
Priority date: 1992-11-30
Filing date: 1992-11-30
Publication date: 1994-06-08

Abstract

The present invention is a kind of EVA integral forming method of sole that directly foams, with ethene-vinyl acetate co-polymer (EVA), polyethylene (PE), calcium carbonate, blowing agent (AC), bridging agent (DCP), mould release (St/a) pigment stirs in the closed mixer, putting into mixing roller then evenly mixes, again through film-discharging machine roll compacting slabbing, again the raw material of this sheet is inserted in the hydraulic press, be carved with on the textured plural shoe-shaped mould on the surface and pass to Steam Heating, make sheet-shaped material through hot pressing and foaming and intumescing, and squeeze out required sole shape and the lines on the sole because of being carved with shoe-shaped on the mould, when mould is opened, foaming body more expands, and the size of its expansion rate is to decide according to the number of blowing agent addition percentage, cuts out the sole of slices at last with footwear pattern cutter.

Description

The direct foaming of ethylene-vinyl acetate copolymer integral forming method of sole

The invention provides the EVA integral forming method of sole that directly foams, with ethene-vinyl acetate co-polymer (EVA), polyethylene (PE), calcium carbonate, blowing agent (AC), bridging agent (DCP), raw materials such as mould release (St/a) and pigment, putting into the closed stirring evenly mixes with mixing roller, then with film-discharging machine roll compacting slabbing, inserting the surface again is carved with in the mould of shoe-shaped, by Steam Heating hot pressing, make it foaming and intumescing, and squeeze out required shoe-shaped and the lines on the sole surface according to the sole shape of die surface, and after mould opens, foaming body more expands, and its expansion rate is to decide according to few more than the blowing agent addition percentage, cuts out the shape of sole at last with footwear pattern cutter.

The employed raw material of general sole (the big end, the middle end) mainly is about 28kg, polyethylene (PE) content with ethylene-vinyl acetate copolymer (EVA) content and is about 72kg, calcium carbonate content and is about 90kg, blowing agent (AC) content and is about that 8kg, bridging agent (DCP) content are about 1kg, mould release (St/a) content is about 1kg and other then is pigment (deciding according to actual required color), and its manufacture process is as follows:

Step 1: at first above-mentioned raw materials is put into the closed mixer and stirred, make it fully evenly to mix, make raw material form the bead bulk by graininess.

Step 2: again it is inserted in the mixing roller once more with its full and uniform mixing.

Step 3:, form the sheet of required size again through the multiple roll compacting of returning of film-discharging machine.

Step 4: multiple the raw material of this sheet is inserted in the hydraulic press, and pass to Steam Heating on the mould, make sheet-shaped material through hot pressing and foaming and intumescing, its oil pressure time is about 20 minutes, pressure is about 150kg/cm ², temperature is about 165 ℃, treats its cooling then.

Step 5: the foaming body that getting foams finishes is inserted oven heat makes it softening.

Step 6: to be carved with the mould of a plurality of sole shapes on the surface, on softening foaming body, extrude required shoe-shaped again.

Step 7: the shape of cutting out sole at last with footwear pattern cutter.

By seven above-mentioned steps, then can finish the making at (the big end, the middle end) of general sole, but by learning in step 4 and the step 5, foaming body promptly has been subjected to the high temperature heating and moulding in foaming process, but but after its cooling, put into baking box again and heat, the processing of this kind post bake, foaming body material is originally wrecked and embrittlement, and this is the difficulty of desire row solution.

The present invention's main purpose is to be, on the mould of hydraulic press, be carved with a plurality of sole shapes, make foaming body in foamed forming process, promptly because of expansion extrusion effect, make the shoe-shaped of extruding that foams, and need not to keep the constant of the material of foaming body own, make it to have preferable elasticity through twice processing.

The present invention's a purpose again is to be, reduces equipment such as procedure of processing and baking box, mould, to save manpower and to reduce cost.

Another object of the present invention is to be, the hot pressing die on the hydraulic press, the shoe-shaped mould all can be carved with in the surface of its upper and lower mould, the foaming body that hot-pressing and foaming is come out is two-sided all to have shoe-shaped, and then dissects into two through splitting the machine of cutting, a pair of sole.

The present invention's another purpose is to be, do an amount of adjustment by blowing agent, the size (being the sole size) of the foaming body that making foams comes out can be complied with required and suitable adjustment, and then the mould of minimizing extrusion shoe-shaped, just, can produce the sole of above-mentioned different size with a kind of mould of size.

Fig. 1: the manufacturing process schematic diagram that is the present invention.

Below, cooperate the graphic specific embodiment of enumerating now, introduce the present invention's structure content in detail, and the function and benefit that can reach is as back:

See also shown in Figure 1, it is manufacturing process schematic diagram of the present invention, be that the employed raw material of sole (big the end, the middle end) mainly is to be about 23 ± 5kg, polyethylene (PE) content with ethene-vinyl acetate co-polymer (EVA) content to be about 72kg, calcium carbonate (CaCO3) content and to be about 90kg, blowing agent (AC) content and to be about that 2 ± 0.1kg, bridging agent (DCP) content are about 1.4kg, mould release (St/a) content is about 1kg and other then is a pigment, and the color of pigment is decided according to actual required color, and its manufacture process is as follows:

Step 1: at first above-mentioned raw materials is put into closed and stirred, make it fully evenly to mix, make raw material form the bead bulk by graininess.

Step 4: again the raw material of this sheet is inserted in the hydraulic press, and pass to Steam Heating on the mould, make sheet-shaped material through hot pressing and foaming and intumescing, be carved with a plurality of shoe-shaped moulds on the mould of its hydraulic press and lines is arranged, so in the foaming body foamed forming process, because of expansion extrusion effect, make foaming according to the shoe-shaped on the die surface shape of the sole of extruding out, its oil pressure time is about 20 minutes, pressure is about 150kg/cm ², temperature is about 165 ℃, treats that then it cools off it.

Step 5: the shape of cutting out sole at last with footwear pattern cutter.

By five above-mentioned steps, can finish the making of sole, and omitted step 4, five in traditional manufacture process, and reduce foaming body and when foaming, remove the high temperature hot briquetting that is subjected to the hydraulic press mould, also will be after cooling, put into the post bake processing embrittlement phenomenon that produces that baking box heats again, to keep the preferable elasticity of the material of foaming body own; Simultaneously, in the minimizing procedure of processing and after without equipment such as baking box, moulds, can save manpower and reduce cost, secondly, can do an amount of adjustment by blowing agent (AC), the size (sole size, the i.e. persons such as different size of children's shoes or adult shoe) of the foaming body that making foams comes out can freely be adjusted control.

In addition, the hot pressing die on the hydraulic press, lines also can all be carved with in the surface of its upper and lower mould, and all there is lines on the foaming body two sides that hot-pressing and foaming is come out, and then cut in half through splitting the machine of cutting, can once finish the making of a pair of sole.

In sum, the present invention had really the manufacture method that breaks through routine have more simple and easy with fast, the while can reach again than the value Practical Benefit on tool progressive and the industry.

Claims

1, a kind of EVA integral forming method of sole that directly foams, raw material mainly is to account for 23 ± 5kg by ethene-vinyl acetate co-polymer (EVA), polyethylene (PE) accounts for 72kg, calcium carbonate (CaCO3) accounts for 90kg, blowing agent (AC) accounts for 2 ± 0.5kg, bridging agent (DCP) accounts for 1.4kg, mould release (St/a) accounts for 1kg and other pigment, at first above-mentioned raw materials being put into the closed mixer stirs, make it to stir, be poured into again in the mixing roller once more with its full and uniform mixing, again through the multiple roll compacting of returning of film-discharging machine, form the sheet of required size, it is characterized in that: the raw material of sheet is inserted in the hydraulic press, and be carved with the shape mould and the sole lines of a plurality of sole shapes on the mould of hydraulic press, and pass to Steam Heating, make sheet-shaped material through hot pressing and foaming and intumescing, again because of expansion extrusion effect, make foaming according to the shoe-shaped shape mould on the die surface extrude shoe-shaped and sole lines, at last cut out blocks of sole with footwear pattern cutter.

2, the integral forming method of sole that directly foams of EVA according to claim 1, the upper and lower mould of the hot pressing on the hydraulic press wherein, shoe-shaped shape mould also can all be carved with in its surface, and all there is shoe-shaped on the foaming body two sides that hot-pressing and foaming is come out, and then dissect into two, once to finish the making of a pair of sole.