CN1091025C

CN1091025C - Method for moulding foaming sole

Info

Publication number: CN1091025C
Application number: CN99123599A
Authority: CN
Inventors: 刘坤钟
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-10
Filing date: 1999-11-10
Publication date: 2002-09-18
Anticipated expiration: 2019-11-10
Also published as: CN1295920A

Abstract

The present invention relates to a forming method for foamed soles. The raw material for a foamed shoe is put in a primary blank mould retaining constant temperature for molding the raw material with a plastic semi-thick solid state; the retained constant temperature does not result in cross-linking and a foaming reaction so that a non-foamed primary blank can be made, wherein bad products can be recovered, regenerated and used; a qualified primary blank is put in a hot pressing foaming mould retaining the constant temperature; the retained constant temperature can result in the cross-linking and the foaming reaction. The two-stage continuous process of the constant temperature is used for enhancing the product quality, saving raw materials, reducing the equipment cost and enhancing the production capability.

Description

The method of moulding foaming sole

The present invention relates to a kind of producing method for soles, particularly relate to a kind of material cost of saving, and can improve quality of finished and production capacity, and reduce the method for the moulding foaming sole of equipment cost.

General outdoor activity, for example play basketball, tennis, golf, jog, by bike etc., and at different kinetic properties, there is the difference in functionality sport footwear to be used, the sole of sport footwear must possess wear-resisting, favorable elasticity, waterproof, and it is comfortable, light flexibility, so, EVA (ethylene-vinylacetate, the polyethylene vinyl acetate) foamed shoe sole is present applied material, the most normal method for making of using is one-shot forming injection foaming method at present, its manufacture process is: behind the EVA raw material mixing granulator, EVA is crosslinked in mould with injection machine injection moulding fusion, foaming, the temperature requirement of mould is at 160 ℃～175 ℃, the crosslinked foaming time was about 420～520 seconds, the about 6.5kg/cm2 of mold pressing, behind crosslinked foaming, moment die sinking utilization foaming tension force makes EVA be expanded to maximum volume (about 1.85～2 times) back and forms semi-finished product, semi-finished product are taken out in mould, the temperature of this moment is about 95 ℃～100 ℃, again via the cooling of different phase temperature, until room temperature, allow this semi-finished product sole under free shrink, finalize the design, again through the cover amount, after eliminating defective products, obtain sole product, it is simple that the EVA sole of being finished by one-shot forming injection foaming method like this has technology, reduce the advantage of labour cost, but, in practical operation, but still there is following shortcoming:

1; waste of material: as Fig. 1; shown in 3; in process of production behind the mold closing; injecting before the EVA fused solution residually in the die cavity 11 of mould 10 has an air; cause EVA of this place and air to produce oxidation easily; make sole 20 positions form the phenomenon of yellow (crosslinked incomplete); the existing method that solves is to utilize the 12 pairs of die cavitys 11 of groove of bleeding of die cavity 11 peripheries to vacuumize before EVA injects this mould 10; yet because of this die cavity 11 is not airtight fully; the deficiency so can bleed usually; when the air in remaining in this die cavity 11 is covered by EVA; to produce in one and press; make this place's charging deficiency can't fill up die cavity 11; formation hardness is not enough; the shortcoming that density unevenness and surface are bad; general this phenomenon mostly occurs at complex-shaped sole face recess (shown in label among Fig. 2 9); particularly when the unexpected variation of the section of sole 20 formation is excessive (as being extended to II-II) by III-III; also produce distortion because of lacking material easily; because sole is foaming; its defective products up to about 30% can't reclaim use again; form waste of material; in addition; as shown in Figure 2; the EVA raw material at these running channel 13 positions is the while foaming also; can only after die sinking, prune away, cause 10%～15% waste of material.

2, production equipment cost height: this method for making all adopts automation disc type injection moulding machine, its matched moulds hydraulic pressure height, and cost is higher.

3, the production capacity technical limitations that dyeed: the method for making of present coloured sole is to add dyestuff when the EVA mixing granulator, dyestuff is distributed in the material grain, yet the reaction time of crosslinked foaming can be added various dose, dyes in different colors and changing, must be along with adjusting board with the precision control die sinking time, and an injection machine can only homochromyly be produced for same batch, when the different size finished product is produced simultaneously with an injection machine, if each specification finished product require output inequality, not only influence mantissa's concluding time, and each colour changing just must be cleaned filling tube, therefore, not only production capacity is restricted, and also can influence the finished product rerum natura, raise the cost, make and pollute.

4, cloudy surface is handled bad: its surface of EVA sole of being finished by one-shot forming injection foaming method forms skin membrane of a light, similar plastic cement, texture are not good, so generally be in the spraying one deck cloudy surface agent (as cured) of sole product surface, but but have easily the shortcoming that takes off, pollutes.

Purpose of the present invention is exactly to provide a kind of in order to overcome the defective that above-mentioned prior art exists to improve quality of finished with two-period form constant temperature continuous processing, and can save material, reduces equipment cost and can improve the method for the moulding foaming sole of production capacity.

Purpose of the present invention can realize in the following manner: the method for moulding foaming sole, and it comprises the following step:

One, preparation foaming shoe material raw material is in it and does not touch first state of temperature crosslinked, foamable reaction.

Two, the foaming shoe material raw material is measured plastotype in the first mold tool of inserting a maintenance constant temperature, the constant temperature that this first mold tool is kept is not for touching second temperature crosslinked, foamable reaction, and it is long-pending that just the die cavity of the die cavity of mold tool and hot-pressing and foaming mould has identical content, but darker and narrow.

Three, the first base of sole that half thick solid shape was finished and be to plastotype is taken out in die sinking, carries out quality restriction, and defective work is recycled again.

Four, the first base of qualified sole being inserted one keeps in the hot-pressing and foaming mould of constant temperature, carry out the crosslinked foaming reaction, the constant temperature that this hot-pressing and foaming mould is kept be for can touch the 3rd temperature crosslinked, foamable reaction, and can be filled in the sole base extrusion just that still is half thick solid shape in the die cavity fully during mold closing and air is discharged.

Five, etc. after crosslinked, foamable reaction is finished, hot-pressing and foaming mould moment is opened, just can obtain the sole semi-finished product of a foaming.

Six, the sole semi-finished product are lowered the temperature contraction, cooling and shaping and obtain a sole product.

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

Fig. 1 is the user mode figure of mould in the existing one-shot forming injection foaming method.

Fig. 2 is the cross-sectional schematic of being got along the straight line I-I among Fig. 1.

Fig. 3 is the schematic diagram of the existing made sole of one-shot forming injection foaming method.

Fig. 4 is the manufacturing flow chart of preferred embodiment of the present invention.

Fig. 5 is the schematic diagram of first mold tool in the preferred embodiment of the present invention.

Fig. 6 is the schematic diagram of the first base of sole in the preferred embodiment of the present invention.

Fig. 7 is the schematic diagram that the first base of sole is inserted hot pressing die in the preferred embodiment of the present invention.

Fig. 8 is the action schematic diagram of hot pressing die in the preferred embodiment of the present invention.

As shown in Figure 4, be the technological process of the method for moulding foaming sole of the present invention, this foaming sole material is to adopt EVA (ethylene-vinylacetate, polyethylene vinyl acetate), the processing step of this method is as follows:

One, preparation EVA raw material is in it and does not touch first state of temperature crosslinked, foamable reaction, and can be divided into two kinds of temperature conditions according to the subsequent technique difference then: (1) first temperature is a normal temperature, and the EVA raw material is the solid granulates shape to cooperate follow-up excessive compression technology.(2) first temperature are 80 ℃～100 ℃, are in the present embodiment to adopt 100 ℃, and the EVA raw material is plastic half thick solid shape to cooperate follow-up Shooting Technique.

Two, shown in Fig. 5～7, the EVA raw material is measured plastotype in the first mold tool 30 of inserting (can adopt overflows presses an or the injection moulding mode) maintenance constant temperature, the constant temperature that this first mold tool 30 is kept is crosslinked for not touching, second temperature of foamable reaction, its suitable temperature range is 80 ℃～100 ℃, be to adopt 100 ℃ in the present embodiment, and the die cavity 31 of first mold tool 30 and hot-pressing and

foaming mould

40,41 have identical content amasss, die cavity 41 has cooperated the variation of footwear type thickness to design, and just die cavity 31 shapes of mold tool 30 are dark and narrow than the die cavity 41 of hot-pressing and foaming mould 40, in addition, the adjustment bolt 32 that first mold tool 30 is designed in the fine-tuning die cavity 31 changes the sole weight of base 50 just, the first bases 50 of sole with the one group of many groups of mold tool 30 making just different size, mold tool 31 ring weeks of 30 die cavitys and bottom convex with most staggered raised lines 33 and just, 34, the sole after making plastotype finish just base 50 in the bottom surface and the side have the air discharge duct 51 that interconnects.

Three, the first base 50 of sole that plastotype is finished is taken out in die sinking, carries out product examine rapidly, the defective recovery again of distortion is arranged, the qualified next step that carries out.

Four, with qualified sole just base 50 insert one and keep carrying out crosslinked, foamable reaction in the hot-pressing and foaming mould 40 of constant temperature, the constant temperature that this hot-pressing and foaming mould 40 is kept is for can touch the 3rd temperature crosslinked, foamable reaction, its suitable temperature range is 150 ℃～180 ℃, be to adopt 170 ℃ in the present embodiment, shown in Fig. 7,8, just base 50 is high and narrow than the die cavity 41 of hot-pressing and foaming mould 40 because of this sole, so be easy to insert in the die cavity 41 and possess a cushion space 8; Behind the mold closing, the first base 50 of sole that is half thick solid shape can be stressed and be filled in fully in the die cavity 41, air in the extrusion while die cavity 41 can be detached by extruding in the cushion space 8, and the air discharge duct 51 of first base 50 bottom surfaces of this sole and side can make exhaust effect better.

Five, treat that crosslinked, foamable reaction is finished after, with this hot-pressing and foaming mould 40 moment die sinking, just can obtain the sole semi-finished product 60 of a foaming.

Six, these sole semi-finished product 60 are lowered the temperature contraction, cooling and shaping, and obtain a sole product.

In addition, can in the die cavity 31 of first mold tool 30, insert an epidermal area (as shown in Figure 4) earlier before above-mentioned steps two plastotypes, this epidermal area has cloudy surface agent and color, and to be coated on the sole surface of base 50 just behind plastotype, the sole after the moulding just has color and atomized surface effect.

Because the present invention changes the technology of an injection foaming method of forming originally, and be divided into the not foamed shoe sole making and the moulding of back segment hot-pressing and foaming of base 50 just of leading portion, and after finishing, can do FEOL the examination and test of products, and defective products is reclaimed use, the raw material of running channel is also recyclable, does not have waste material to produce fully; In addition, because be somebody's turn to do the size that first mold tool 30 is designed to adjustable mould preparation cave 31, can one group of mold tool 30 supply just organize different size hot-pressing and foaming moulds 40 use simultaneously more.

And because of first mold tool 30 has identical internal volume with the

die cavity

31,41 of hot-pressing and foaming mould 40, but just the die cavity 41 of the die cavity 31 specific heat Hair Fixers of mold tool 30 bubble mould 40 is darker and narrow, help into mould and exhaust, and this sole just shape of base 50 changes according to footwear type thickness in advance, when extrusion, can successfully be fills up to each corner in the die cavity 41 fully, do not have yellow, problem on deformation generation behind the foaming, and density be even, musculus cutaneus is good.

And first mold tool 30 is maintained 100 ℃ of constant temperature, hot-pressing and foaming mould 40 maintains 170 ℃ of constant temperature, can keep the sole plasticity of base 50 just, and heat energy can not lose before inserting hot-pressing and foaming mould 40.

Compared with prior art, the method for moulding foaming sole of the present invention has the following advantages and effect:

1, save material: because the first base 50 of the sole of phase I does not foam, can implement quality restriction to it, Defective products or the recyclable recycling of running channel raw material, so raw material do not waste fully, and the quality of finished height.

2, equipment cost is low: the present invention adopts only needs two cover hot-press equipments when overflowing the compression moulding type, adopt the injection moulding plastotype The time only need first base feeding machine and a cover hot-press equipment of the low matched moulds hydraulic pressure of a tool, equipment cost is lower.

3, production capacity height: existing in-mould decoration foaming is that an injection moulding head is faced many group moulds, Because treating that mould has increased the time that turnover is waited for; And the first base 50 of the sole that the present invention does not foam is foamed into finished product Type is respectively independent production, do not have the constraint of scheduling order, and one group of first mold tool 30 can be made multiple difference The sole of size just base 50 supplies simultaneously production and application of hot-pressing and foaming mould 40, and the first base 50 of this sole has one Fixed temperature can be saved its curing time, thereby speed of production is not subjected to the restriction of time and scheduling; On the other hand, With the difference of staining technique, the present invention only utilizes the epidermal area of a tool color to coat just base 50 of sole, annotates Material is managed all the time raw material of injection moulding primary colors, needn't consider the moulding time fluctuation, often clean the limit production such as filling tube The problems such as ability, and dyestuff is used fewly, neither can affect the finished product rerum natura, can reduce cost again, reduce pollution.

4, the cloudy surface treatment effect is good: because sneaking in advance cloudy surface agent, difficult drop-off behind the Sole moulding in the epidermal area.

Claims

1, a kind of method of moulding foaming sole is characterized in that: this method comprises the following step: one, preparation foaming shoe material raw material is in it and does not touch first state of temperature crosslinked, foamable reaction; Two, this foaming shoe material raw material is measured plastotype in the first mold tool of inserting a maintenance constant temperature, the constant temperature that this first mold tool is kept is not for touching second temperature crosslinked, foamable reaction, and it is long-pending that just the die cavity of the hot-pressing and foaming mould of the die cavity of mold tool and a maintenance constant temperature has identical content, but darker and narrow; Three, the first base of sole that half thick solid shape was finished and be to plastotype is taken out in die sinking, carries out quality restriction, and defective work is recycled again; Four, the first base of qualified sole is inserted in the hot-pressing and foaming mould, carry out the crosslinked foaming reaction, the constant temperature that this hot-pressing and foaming mould is kept be for can touch the 3rd temperature crosslinked, foamable reaction, and can be filled in the sole base extrusion just that still is half thick solid shape in the die cavity fully during mold closing and air is discharged; Five, treat that crosslinked, foamable reaction is finished after, this hot-pressing and foaming mould moment is opened, just can obtain the sole semi-finished product of a foaming; Six, the sole semi-finished product are lowered the temperature contraction, cooling and shaping and obtain a sole product.

2, the method for moulding foaming sole as claimed in claim 1 is characterized in that: described first temperature is a normal temperature, and the foaming shoe material raw material is the solid granulates shape.

3, the method for moulding foaming sole as claimed in claim 1 is characterized in that: the adoptable scope of described first temperature is 80 ℃～100 ℃, and the foaming shoe material raw material is half plastic thick solid shape.

4, the method for moulding foaming sole as claimed in claim 3 is characterized in that: described first temperature is 100 ℃.

5, the method for moulding foaming sole as claimed in claim 1 is characterized in that: the adoptable scope of described second temperature is 80 ℃～100 ℃.

6, the method for moulding foaming sole as claimed in claim 5 is characterized in that: described second temperature is 100 ℃.

7, the method for moulding foaming sole as claimed in claim 1 is characterized in that: the adoptable scope of described the 3rd temperature is 150 ℃～180 ℃.

8, the method for moulding foaming sole as claimed in claim 7 is characterized in that: described the 3rd temperature is 170 ℃.

9, the method for moulding foaming sole as claimed in claim 1 is characterized in that: described step 2 is inserted an epidermal area earlier in the die cavity of first mold tool before plastotype, this epidermal area has cloudy surface agent and color.

10, the method for moulding foaming sole as claimed in claim 1, it is characterized in that: the first mold tool die cavity ring week of described step 2 and bottom convex with most staggered raised lines, and the sole of plastotype after finishing just the bottom surface and the side of base have the air discharge duct that interconnects.

11, the method for moulding foaming sole as claimed in claim 1 is characterized in that: the first blank molding mould of described step 2 is provided with fine-tuning die cavity and the adjustment bolt of base weight at the beginning of changing sole.