CN1289675A - Quantitative extrusion method for shaping shoe sole of ethyl vinylacetate - Google Patents

Abstract

A quantitative extrusion method for shaping shoe sole of ethyl vinylacetate includes such steps as proportionally mixing ethyl vinylacetate particles, foamer, filler and bridging agent together, loading in extruder, extruding out sheet, cutting the unfoamed sheet, quantitatively loading the cut sheet in the first mould, heating, getting blank, trimming, loading in the second mould, heating while pressuring for a cetain time, and cooling. Its advantages are less waste, simple process and low cost.

Description

The quantitative forming method of the extrusion of ethylene vinyl acetate sole

The present invention relates to a kind of forming method of sole, particularly relate to a kind of quantitative forming method of extrusion of ethylene vinyl acetate sole.

General foamed shoe sole is particularly with EVA (ethylene-vinyl acetate; Ethylene vinyl acetate) end in the sole made of material or the footwear, have in light weight, shock absorption is good, advantages of cheap price, but if process with ejection formation, but has the uppity shortcoming of size after sulfidization molding foams, so, present sole can be divided into its processing procedure two stage foaming processing procedures (secondary frothing forming just), a kind of EVA secondary frothing forming producing method for soles was arranged in the past, and it comprises following step: raw material weighs ← kneader mixes ← mixing and compressing tablet ← foam ← cool off ← cut epithelium ← slitting ← severing footwear type ← grinding ← post forming mould shape ← deburring ← finished product up and down.

Though and above-mentioned manufacture method can produce meet desire the footwear molded dimension of moulding, and adopted by general shoemaking person, but, above-mentioned manufacture method must be through the processing procedure in road surplus ten, the process complexity, therefore production time and cost are all higher, and the severing footwear type in work flow, grind, waste materials that processing procedure produces such as deburring are quite a lot of, particularly after the one step foaming moulding, be attached on the mould release on surface in the time of must eliminating the stock unnecessary flash in surface and the demoulding, add the formed waste material of severing footwear type, make the waste material that is produced with general EVA producing method for soles more up to 40%～60%, and when handling these waste problems, have only few part waste material to be clayed into power as outside the filler, all the other major parts all are burning or the mode of burying is handled, and waste of material that not only causes and waste material can cause environmental pollution.

The object of the present invention is to provide a kind of quantitative forming method of extrusion that reduces waste material, simplification procedure of processing that produces in the manufacture process and the ethylene vinyl acetate sole that reduces production costs.

The quantitative forming method of the extrusion of ethylene vinyl acetate sole of the present invention is characterized in that: comprise the following step:

One, raw material is weighed: with ethylene vinyl acetate micelle, blowing agent, filler and bridging agent, weigh up weight according to certain ratio;

Two, mix, slice and section: above-mentioned raw materials is inserted in the extruder after evenly mixing, and extrusion thickness is the not expanded polystyrene sheet of 1～3mm, and simultaneously this film is cut into most strips;

Three, foaming for the first time: the strip film that will not foam is inserted for the first time overlapping heating in the mould, and to control its length be 1/2～1/3 of die length, and heating-up temperature is 140 ℃～170 ℃, and the foaming process that lasts 4～8 minutes;

Four, deburring is ground: the germule behind one step foaming is ground through deburring, to cooperate the mould die cavity external form of second time of foaming;

Five, post forming: the stock after deburring is ground is inserted in the secondary mould die cavity, and forming temperature is 140 ℃～160 ℃, and the forming process of lasting 3～5 minutes was cooled off 7～10 minutes again, evenly reduced to room temperature and promptly obtained finished product.

The quantitative forming method of the extrusion of described ethylene vinyl acetate sole is characterized in that:

In first step, this ethylene vinyl acetate micelle accounting example 65～75%, blowing agent is 3～5%, filler is 20～30%, and bridging agent is 1～2%.

By above-mentioned explanation as can be known, the quantitative forming method of the extrusion of EVA sole of the present invention has advantage as described later:

One, before the present invention utilizes the foaming first time, handle through section, metering earlier, so stock 20 waste material behind one step foaming less relatively (only accounting for 5～15% approximately), do not have the situation that general EVA producing method for soles produces a large amount of waste materials, so the present invention is after secondary frothing forming, almost there is not the burr flash to produce, not only can reduce the pollution of environment and meet environmental protection requirement, and needn't pass through the processing of following process processing procedures such as deburring, severing footwear type again, can reduce the procedure that cuts, and practicality and convenience can promote machine-shaping the time.

Two, because the present invention is the film 11 that the film 10 of full wafer is cut into multi-disc, give overlapping back hot-pressing and foaming, can make the gas (bubble) between the multi-disc overlapping layer loose excessive easily on the one hand to outside, so do not have bag wind phenomenon, heat energy can be directed to fast each strip film 11 than the depths, center on the other hand, make its grade in the one step foaming process, each strip film 11 homogeneous that can be heated, therefore comparatively even compact and smooth surface after these stock 20 foaming, just can make to desire sole 30 thickness of moulding thicker, do not have general producing method for soles skin yet and foamed fully, and the central too late situation that still foams.

Three, because processing and manufacturing of the present invention is easy, and foaming speed is very fast, can save general EVA producing method for soles about process time 1/3～1/2 or more approximately, has the effect of reduction manufacturing cost.

Four, in addition, the present invention is the overlapping operation processing mode of slitting after the employing slice, so can produce the EVA sole (containing the big end and the middle end) of different densities (two-density), the finished product that processes at one time makes sole lighter, and can reach the light-weighted requirement of sole.

The present invention is described in detail below in conjunction with drawings and Examples:

Fig. 1 is the block flow diagram of preferred embodiment of the present invention.

Fig. 2 is the method flow diagram of the Sole moulding of preferred embodiment of the present invention.

As shown in Figure 1, 2, the quantitative forming method of the extrusion of EVA sole of the present invention comprises following step:

One, raw material is weighed and is handled 1: be with materials such as EVA micelle, blowing agent, filler and bridging agents, according to the requirement of rerum natura, weigh up weight in certain proportion; Usually in its mixed proportion, the EVA micelle accounts for 65%～75%, and blowing agent is about 3%～5%, and filler is about 20%～30%, and bridging agent is about 1%～2%.

Two, mix, slice and slicing treatment 2: above-mentioned raw materials is inserted after evenly mixing in the extruder (figure does not show), it is closely knit to utilize extruder above-mentioned raw materials can be squeezed into, and the not expanded polystyrene sheet 10 of thickness between 1～3mm, and simultaneously with the film 10 of this slice when the extruder discharging opening is exported, can be subjected to cutting knife to cut into tool suitable length, width and be the strip sheet 11 of strip.

Three, foaming 3 for the first time: before foaming, sole thickness and footwear molded dimension according to desire moulding, estimate film 11 quantity of the required material that do not foam, to insert foaming molding mold 100 interior overlapping hot pressing for the first time without the strip film 11 of foaming again, and control its length and be about 1/2～1/3 of die cavity length, heating and temperature control is between about 140 ℃～170 ℃, and pressure is controlled at 120～150kg/cm ², and last about 4～8 minutes foaming process, these strip films 11 are squeezed and driving fit mutually, and stand after the thermal response can and bridging agent, the crosslinked foaming then of blowing agent.

Four, deburring grinds 4: will be through the germule 20 after the foaming for the first time with the processing machine unnecessary part that prunes away, and through grinding, so that these germule 20 profiles can conform with the mould die cavity of foaming for the second time.

Five, post forming 5: above-mentioned stock 20 ' after grinding is inserted for the second time in the mould die cavity 200, and the control forming temperature is about 140 ℃～160 ℃, and pressure is controlled at 100～120kg/cm ², last about 3～5 minutes foaming process, make this germule 10 can fully be melt into the shape of mould, again through cooling off 7～10 minutes, make this post forming mould 200 can evenly reduce to room temperature.

Six, finished product 6: this post forming mould 200 is opened, and taking out promptly becomes sole product 30.

Claims (2)

1. the quantitative forming method of the extrusion of an ethylene vinyl acetate sole is characterized in that: comprise the following step:

One, raw material is weighed: with ethylene vinyl acetate micelle, blowing agent, filler and bridging agent, weigh up weight according to certain ratio;

Two, mix, slice and section: above-mentioned raw materials is inserted in the extruder after evenly mixing, and extrusion thickness is the not expanded polystyrene sheet of 1～3mm, and simultaneously this film is cut into most strips;

Three, foaming for the first time: the strip film that will not foam is inserted for the first time overlapping heating in the mould, and to control its length be 1/2～1/3 of die length, and heating-up temperature is 140 ℃～170 ℃, and the foaming process that lasts 4～8 minutes;

Four, deburring is ground: the germule behind one step foaming is ground through deburring, to cooperate the mould die cavity external form of second time of foaming;

Five, post forming: the stock after deburring is ground is inserted in the secondary mould die cavity, and forming temperature is 140 ℃～160 ℃, and the forming process of lasting 3～5 minutes was cooled off 7～10 minutes again, promptly obtains finished product evenly to reduce to room temperature.

2. the quantitative forming method of the extrusion of ethylene vinyl acetate sole as claimed in claim 1 is characterized in that:

In first step, this ethylene vinyl acetate micelle accounting example 65～75%, blowing agent is 3～5%, filler is 20～30%, and bridging agent is 1～2%.

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