CN1291542A

CN1291542A - Cooling method and mould for shaping foamed sole

Info

Publication number: CN1291542A
Application number: CN 99118947
Authority: CN
Inventors: 刘坤钟
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-31
Filing date: 1999-08-31
Publication date: 2001-04-18

Abstract

A cooling method for shaping the foamed sole features that the sized sole blank is put inside a cooling shaping mould and the cooling liquid at 10 deg.C is used for cooling it. The mould seat of its upper mould has cooling liquid flowing channel and the shaping mould is wrapped by a press plate. The cooling liquid continuously flows through the flowing channel to expand the shaping mould and apply uniform pressure to inner surface of sole blank, resulting in accurate size.

Description

The cooling and shaping method and the mould thereof of foamed shoe sole

The present invention relates to a kind of foamed shoe sole manufacturing process and mould structure thereof, particularly relate to a kind of cooling and shaping method and mould thereof of foamed shoe sole.

General foamed shoe sole is meant (the ethylene-vinyl acetate with EVA especially; Ethene-vinyl acetate copolymer) end in the sole made of material or the footwear, it has in light weight, shock absorption is good, advantages of cheap price, but the shortcoming that the wayward size in cross moulding foaming back is also arranged technically, so, the general practice is that forming process is divided into the second order segmentation, make the thick embryo of an EVA earlier, should insert in the metal die by thick embryo again, make high pressure, heat cold circulation and be molded into required finished form and size, but the thick embryo production process of EVA complexity, from EVA mixing (slice) to moulding, need through slitting, severing, beat thick, road production process surplus the deburring etc. ten, process consuming time, consumptive material, and must insert again again after thick embryo is made carry out in the metal pattern hot-forming, just can make a sole or the middle end, and the production method of this second order segmentation can cause molding time long, hot transfer efficiency is poor, energy loss is big, production capacity is limited, the shortcoming that Mold Making complexity and production cost are high.

For improving the shortcoming of above-mentioned general method for making of two-stage, a kind of method for making of an ejection formation is arranged at present, its processing procedure is for to inject the EVA raw material of melting state in the mould, and the temperature requirement in the mould is at 160 ℃～175 ℃, and mold pressing is 6.5kg/cm ²And in mould, produce crosslinked; foamable reaction; crosslinked; foamed time is between 420～540 seconds; moment die sinking utilization foaming tension force makes EVA be expanded to maximum volume (being about 1.85～2 times); form the shaping embryo then; and after should the shaping embryo in mould, taking out; the temperature of this moment is about 95 ℃～100 ℃; the baking oven of sending into the different phase temperature via conveyer belt cools off gradually again; until room temperature; be allowed to condition under the room temperature and place a few hours and the free shrink typing; so once penetrate the EVA sole of finishing and have the production capacity height; reduce consumptive material; finished product hardness is even; rerum natura is good; no processing pollution; processing procedure is simple; reduce advantages such as labour cost; but; it but has the shortcoming of wayward contraction size; must the cover amount screen; because of the EVA material with direct foaming; when room temperature is cooled off naturally; regular meeting makes that because of the various condition elements of room temperature the change in size of finished product is too many; especially variation is big on length, thus must be according to benchmark number cover amount, and its length tolerance scope is at ± 1.5mm; and when practical operation; even use a large amount of manpower amounts of overlapping; to the processing procedure of sign indicating number, its fraction defective is still near 20%, and this is because cooling contraction size is wayward.

The object of the present invention is to provide a kind of cooling and shaping method and mould thereof that reduces cost, reduces the foamed shoe sole of disqualification rate.

Technical program of the present invention lies in providing a kind of cooling and shaping method of foamed shoe sole, be with an inside have finish crosslinked, the mould of the embryo material of foaming is opened, this embryo material utilization foaming tension force instantaneous expansion, after stage cooling contraction and cover amount, can obtain a sole shaping embryo, it is characterized in that: the sole shaping embryo after the cover amount is inserted in a cooling shaping mould inside carries out cooling and shaping, this cooling shaping mould is to be provided with most die holders in most die cavitys, and be arranged with a molding on this die holder, when sole shaping embryo is inserted in die cavity inside, this shaping membrane is subjected to low temperature and continues mobile cooling fluid to support, and the medial surface of sole shaping embryo evenly exerted pressure, and carry out cooling and shaping.

The present invention also provides a kind of cooling shaping mould of foamed shoe sole, comprises a counterdie and a patrix, it is characterized in that: be concaved with most die cavitys on this counterdie; Convex with majority on this patrix and be set in die holder in the die cavity, this die holder and die cavity opposing end faces are provided with most coolant flow channels of communicating with each other, and these die holder two ends respectively are provided with a hand-hole and that flows to, derives for cooling fluid and portal, this hand-hole communicates with coolant flow channel respectively with portalling, this die holder periphery is provided with an annular groove, and this annular groove bottom surface is provided with a groove that is loop shaped; This mould also comprises most shaping membranes, most leakproof circle and most pressing plate; This shaping membrane is a capsule bag shape of making the unidirectional opening of tool with the rubber material, and is sheathed and be coated on the die holder of this patrix, and its opening ora terminalis extends in this annular groove; This leakproof circle is to be compressed on this shaping membrane opening ora terminalis and to be forced in the groove; This pressing plate is to make hollow and annular, and in the sheathed annular groove that is fixed on this patrix, and this leakproof circle and shaping mould opening ora terminalis are fixed in compacting.

The cooling and shaping method of described foamed shoe sole is characterized in that: this cooling fluid is a water.

The cooling shaping mould of described foamed shoe sole is characterized in that: this counterdie is to be articulated by the module more than two or two to form, and respectively is formed with shrinkage pool on the opposite face of adjacent two modules, and two shrinkage pools of adjacent two modules are to being connected into a die cavity.

In sum, cooling and shaping method of the present invention cooperates cooling shaping mould, can produce following effect:

1. reduce cost: because this cooling shaping mould provides sole shaping embryo cooling and shaping, so the size of mould, precision, intensity, material requirements are not high, can adopt multinomial moulding material (as glass, gypsum, hard silica gel, engineering plastics etc. can), and its manufacture method is easy, the saving cost, do not need to increase other production equipments, secondary material, just can be used at general EVA foaming machine, the flow process of arranging production is easy, need not increase the technology that unit equipment just can improve processing procedure, production cost is reduced in a large number.

2. simple to operate: EVA moment the back of foaming in mould, take out and send conveyer belt to and carry out stage uniform decrease in temperature and shrink, insert this cooling shaping mould internal lock after finishing and closely close, easily permutation row puts, and treats that empirical value judges form removal after cool time, processing ease, required manpower competency profiling is not high.

3. efficient height: the processing procedure passage of general second order segmentation is many, the machine-shaping time is long, required production equipment is many, carry consuming time, and the use manpower is many, though and the method for making of an ejection formation can solve the aforesaid drawbacks, can make to become fraction defective up to 20% disappearance, and the present invention utilizes this cooling shaping mould that the effect of an ejection formation is really reached to improve its productivity effect, and fraction defective can reduce and approaches 0%.

4. this counterdie branch is made left module, middle module and right module, its effect can be avoided form removal to be difficult for and injure the EVA finished product, and the form removal sampling that the setting of this fastener can make counterdie is easily, and this elastic force fore-set can separate can make the counterdie form removal time automatically, in the die sinking operation quite easily, fast.

5. this shaping membrane can directly turn over system by die holder, and when counterdie was made with plaster mold, the die cavity bottom surface decorative pattern of counterdie also can directly be pressed into by sole product, and the straight forming die cavity, so shaping membrane and the die cavity system of turning over is easily.

6. shaping membrane is to make with the rubber material of tool high-tension, and its elasticity is good, quality is soft, is difficult for injuring the shaping embryo before the uncolled typing of this shaping embryo.

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

Fig. 1 is the manufacturing process schematic diagram of preferred embodiment of the present invention.

Fig. 2 is the three-dimensional exploded view of the cooling shaping mould of preferred embodiment of the present invention.

Fig. 3 is the patrix combination section of preferred embodiment of the present invention.

Fig. 4 is the cooling shaping mould die opening state generalized section of preferred embodiment of the present invention.

Fig. 5～9th, the cooling shaping mould operating process schematic diagram of preferred embodiment of the present invention.

As shown in Figure 1, the cooling and shaping method of foamed shoe sole of the present invention comprises following steps:

1.EVA the mixing granulator of raw material.

2.EVA raw material penetrates with injection molding method, and injects a molding tool inside and carry out crosslinked, foamable reaction, its generation is crosslinked, the foamable reaction condition is: temperature is between 160 ℃～175 ℃ in the mould, and mold pressing is 6.5kg/cm ², crosslinked, foamed time is between 420～540 seconds.

3. moment is opened mould, utilizes foaming tension force to make EVA be expanded to maximum volume (being about 1.85～2 times), and forms a shaping embryo (this temperature of advancing to be shaped embryo is about 95 ℃～100 ℃).

4. should the shaping embryo send into the baking oven with the control of three phase temperature with conveyer belt and carry out uniform decrease in temperature and shrink, wherein the actual temperature of first baking oven is that 85 ℃～87 ℃, the actual temperature of second baking oven are that 60 ℃～65 ℃, the actual temperature of the 3rd baking oven are 50 ℃～60 ℃.

5. when stage uniform decrease in temperature shrinks shaping embryo in the processing procedure and arrived preliminary dimension, promptly take out and carry out next step, and do not reach preliminary dimension, still stay on and shrink in the processing procedure at stage uniform decrease in temperature.

6. cooperation Fig. 2, shown in 4, the shaping embryo 1 that reaches preliminary dimension is inserted a cooling shaping mould 100 inside carry out cooling and shaping, this cooling shaping mould 100 is to be articulated by a counterdie 10 and a patrix 20 to form, on this counterdie 10, be provided with two die cavitys 110,120, and be provided with two die holders 21 at this

patrix

20,22, make this

die holder

21,22 can with die cavity 110,120 mutual fits, and this die holder 21, utilize a pressing plate 50 with a shaping membrane 30 compacting location on 22, be inserted in die cavity 110 at sole shaping embryo 1, during 120 inside, this shaping membrane 30 can be subjected to low temperature and continue mobile cooling fluid 60 (being to be example with water in the present embodiment) to support, and the medial surface of sole shaping embryo 1 evenly exerted pressure, to carry out the cooling and shaping of the scheduled time.

7. open this cooling shaping mould 100, just can obtain a sole product.

Cooperate shown in Figure 2ly, cooling shaping mould 100 of the present invention comprises a counterdie 10, a patrix 20, two shaping membranes 30, two leakproof circles 40 and two pressing plates 50 and four groups of fasteners 70.

This counterdie 10 is by a left module 11, in module 12 and a right module 13 articulate with an end wherein and form, on this left side module 11 and middle module 12 opposite faces, respectively be formed with one first shrinkage pool 111 and one second shrinkage pool 121, and by this first, two shrinkage pools 111,121, butt joint forms a die cavity 110, also respectively be formed with one the 3rd shrinkage pool 122 and one the 4th shrinkage pool 131 and be somebody's turn to do on middle module 12 and right module 13 opposite faces, the 3rd shrinkage pool 122 and the 4th shrinkage pool 131 can dock and form another die cavity 120, in addition, at an end that is symmetrical in die sinking and in this left side module 11, on right module 13 and the middle module 12 opposed inside faces, respectively be provided with a built-in elastic force fore-set 112,132.

This patrix 20 is and is hubbed on a wherein side of this counterdie 10 rotationally, with this die cavity 110, convex with two die holders 21 on the 120 opposed inside faces, 22, when this patrix 20 is covered on the counterdie 10, this die

holder

21,22 can be set in die cavity 110, in 120, this die

holder

21,22 with die cavity 110,120 opposing end faces are provided with most coolant flow channels 211 of communicating with each other, 221, and this

die holder

21,22 two ends respectively are provided with and can flow to for cooling fluid 60, one hand-hole 212 of deriving, 222 and one portals 213,223, this hand-hole 212,222 with portal 213,223 respectively with coolant flow channel 211,221 communicate, at this

die holder

21,22 peripheries are provided with an

annular groove

23,24, this

annular groove

23,24 bottom surfaces and die

holder

21,22 bottom joining places are provided with a groove 25 that is loop shaped again, 26, in addition, at this groove 25, the annular groove 23 in 26 outsides, 24 bottoms are provided with most perforation 231,241.

This shaping membrane 30 is capsule bag shapes of making the unidirectional opening of tool with the rubber material of tool high-tension, its thickness is about 0.8～0.1mm, and sheathed and be coated on the

die holder

21,22 of this patrix 20, this shaping mould 30 has an opening ora terminalis 31 and may extend in the

annular groove

23,24.

This leakproof circle 40 is to make with the rubber material, the opening ora terminalis 31 of this shaping membrane 30 can be suppressed and is forced in the

groove

25,26.

This pressing plate 50 is to make hollow and annular, which is provided with most screws 51, this screw 51 is symmetrical in perforation 231,241, when this pressing plate 50 after die

holder

21,22 ends are inserted in, can be nested in the

annular groove

23,24 of this patrix 20, and can 31 compactings of this shaping membrane 30 opening ora terminalis are fixing, pass in this perforation 231,241 from outside to inside with screw 52 again and be arranged in the screw 51, this

leakproof circle

40 and 31 compactings of shaping membrane 30 opening ora terminalis can be fixed, and reach the purpose of sealing, leakproof.

This fastener 70 is made up of a Button Block 71 and a button hook 72, this Button Block 71 is to be pivoted with leader 712 at a positioning seat 711 1 ends, on the handle 712 of contiguous and these positioning seat 711 articulated sections, be pivoted with a clasp 713 again, and make each Button Block 71 be installed in left module 11 respectively, the leading flank and patrix 20 both sides of right module 13, the left module 11 of module 12 leading flank two ends and counterdie 10 during each button hook 72 then is installed in symmetrically, right module 13 outsides, when the handle 712 of this Button Block 71 is pulled, this handle 712 can drive clasp 713 away from or level off to this button hook 72, and make this left side module 11, middle module 12 and right module 13 reach the purpose of separating or merging, and this patrix 20 is with counterdie 10 opens or mold closing.

The above-mentioned described overall structure of nationality, and cooperate shown in Figure 3, when utilizing pressing plate 50, this shaping membrane 30 sets firmly the die holder 21 of locating and being coated on this patrix 20, during 22 side faces, this coolant flow channel 211,221 outer openings is just coated by shaping membrane 30, for another example shown in Fig. 4～9, when crosslinked, shaping embryo 1 behind the foamable reaction is inserted the die cavity 110 of this counterdie 10, after in 120, be under the die opening state with counterdie 10 at this patrix 20, earlier with the left module 11 of this counterdie 10, middle module 12 and right module 13 are merged, and utilize these fastener 70 fastenings to fix, and this patrix 20 is covered on counterdie 10, make this

die holder

21,22 are positioned at shaping embryo 1 top, when clasp 713 buckles of this fastener 70 on button hook 72, and this handle 712 is pulled when system button of pulling, this patrix 20 is closure state with counterdie 10, at this moment, low temperature can be pressurizeed the cooling fluid 60 of (about 10 ℃) from hand-hole 212,222 inject, and utilize this coolant flow channel 211,221 equably conducting to die holder 21, each position, 22 bottom surfaces, portal 213 by this at last, 223 flow out, and this shaping membrane 30 is subjected to the effect that supports of cooling fluid 60, can support last medial surface in the elastic filling mode at shaping embryo 1, make the inboard of this shaping embryo 1 be subjected to the even compacting of gross area, and utilize the method for volume restrictions, make this shaping embryo 1 can not free shrink, add the acceleration cooling effect that utilizes this cooling fluid 60 to be produced, can make this shaping embryo 1 be shaped into needed size rapidly, at last, after treating that empirical value is judged cool time (about 30 minutes), just can pull open each fastener 70, and make this clasp 713 separate shape with button hook, the operator just can upwards raise patrix 20, again embedding is tied this left side module 11, the fastener 70 of middle module 12 and right module 13 is pulled to be opened, utilize this elastic force fore-set 112,132 elastic force effect, can make this left side module 11, right module 13 is outwards removed with respect to middle module 12, (but this moment, this clasp 713 did not break away from fully with button hook 72, helped fastening next time) just can be from this die cavity 110, take out the sole product 2 of typing fully in 120.

Particularly, method for making of the present invention and cooling shaping mould 100 have more than and are limited to the use of EVA material, also can be applicable to the material that other utilize the foaming article, in addition, sole is not to obtain the embryo that is shaped with a shoot mode, but adopts the pressure mode of overflowing, and can adopt method for making of the present invention yet.

Claims

1. the cooling and shaping method of a foamed shoe sole, be that the mould that an inside has an embryo material of finishing crosslinked, foaming is opened, this embryo material utilization foaming tension force instantaneous expansion, through the stage cooling shrink and the cover amount after, can obtain a sole shaping embryo, it is characterized in that:

Sole shaping embryo after the cover amount is inserted in a cooling shaping mould inside carries out cooling and shaping, this cooling shaping mould is to be provided with most die holders in most die cavitys, and be arranged with a molding on this die holder, when sole shaping embryo is inserted in die cavity inside, this shaping membrane is subjected to low temperature and continues mobile cooling fluid to support, and the medial surface of sole shaping embryo evenly exerted pressure, and carry out cooling and shaping.

2. the cooling shaping mould of a foamed shoe sole comprises a counterdie and a patrix, it is characterized in that:

Be concaved with most die cavitys on this counterdie;

Convex with majority on this patrix and be set in die holder in the die cavity, this die holder and die cavity opposing end faces are provided with most coolant flow channels of communicating with each other, and these die holder two ends respectively are provided with a hand-hole and that flows to, derives for cooling fluid and portal, this hand-hole communicates with coolant flow channel respectively with portalling, this die holder periphery is provided with an annular groove, and this annular groove bottom surface is provided with a groove that is loop shaped;

This mould also comprises most shaping membranes, most leakproof circle and most pressing plate;

This shaping membrane is a capsule bag shape of making the unidirectional opening of tool with the rubber material, and is sheathed and be coated on the die holder of this patrix, and its opening ora terminalis extends in this annular groove;

This leakproof circle is to be compressed on this shaping membrane opening ora terminalis and to be forced in the groove;

This pressing plate is to make hollow and annular, and in the sheathed annular groove that is fixed on this patrix, and this leakproof circle and shaping mould opening ora terminalis are fixed in compacting.

3. the cooling and shaping method of the foamed shoe sole of stating as claim 1 is characterized in that:

This cooling fluid is a water.

4. the cooling shaping mould of foamed shoe sole as claimed in claim 2 is characterized in that:

This counterdie is to be articulated by the module more than two or two to form, and respectively is formed with shrinkage pool on the opposite face of adjacent two modules, and two shrinkage pools of adjacent two modules are to being connected into a die cavity.