阅读说明：本技术 一种网膜用于橡胶大底与eva中底模压成型的粘合工艺 (kinds of net films used for adhering rubber outsole and EVA midsole in compression molding mode ) 是由 宾家荃 宾家齐 于 2019-10-24 设计创作，主要内容包括：本发明涉及鞋底制备工艺技术领域,具体为一种网膜用于橡胶大底与EVA中底模压成型的粘合工艺,包括如下步骤：S1、胶膜原料准备；S2、熔融挤出；S3、溶体喷丝；S4、压制；S5、修边处理；S6、合模。本发明能把该网状胶膜适用于更广泛的各类橡胶大底的型体、以及EVA与EVA材质的粘合,材料用量少,成本大幅度降低,柔软,可使用的型体要更多各种弧度大或边墙高的型体均可使用,可适用范围广,可多层裁断,提高效率,橡胶大底的成品率更高因为网状具有透气性所以橡胶大底硫化过程中不会产生气泡,所以边料皆可使用,减少浪费,降低成本,使用率高,边料可用于其它小部件等使用,具有突出的实质性特点和显著的进步。(The invention relates to the technical field of sole preparation processes, in particular to a bonding process for compression molding of kinds of net films for rubber undersoles and EVA midsoles, which comprises the following steps of S1 preparing raw materials of a film, S2 melting and extruding, S3 melting and spinning, S4 pressing, S5 trimming, S6 and die assembly.)

1, kinds of nethike membranes are used for the bonding process of the compression molding of rubber undersole and EVA mid-sole, characterized by comprising the following steps:

s1, preparing a glue film raw material: selecting mixed particles of ethylene-vinyl acetate with the particle size of 1-3mm, maleic anhydride graft of the ethylene-vinyl acetate, maleic anhydride graft of polypropylene, polyethylene wax and polyethylene;

s2, melt extrusion: melting the mixed particles in the step S1 in a screw extruder, and measuring the output flow of the solution through a metering pump;

s3, melt spinning: the melt which is extruded and metered in the step S2 reaches a melt-blowing die head and is sprayed out through a spinneret of the melt-blowing die head to form a micro-fiber reticular rubber film;

s4, pressing: uniformly spreading the microfiber reticular rubber film formed in the step S3 on the surface of a raw rubber outsole, covering the surface of the microfiber reticular rubber film with a high-temperature-resistant PET protective film, and putting the microfiber reticular rubber film into a rubber outsole mold for pressing to form a cured rubber outsole;

s5, trimming: trimming and polishing the cooked rubber outsole pressed in the step S4 into a finished rubber outsole product, and performing trimming and polishing coarse treatment on the finished EVA insole;

and S6, closing the die, namely placing the finished rubber outsole product in the step S5 into an EVA die for forming a body, placing the finished rubber outsole product into a corresponding EVA middle sole for sole assembly, closing the die and pressing for time, heating for 5-12min, and then cooling with water for 5-12min to form the complete sole.

2. The kinds of nets used for the bonding process of the rubber outsole and the EVA insole in the molding process of claim 1, wherein the step S1 is formed by mixing ethylene-vinyl acetate, maleic anhydride graft of polypropylene, polyethylene wax and polyethylene according to the weight ratio of (50-60): 25-40): 0-2): 2-5): 0-5.

3. The kinds of nets used for the bonding process of the compression molding of the rubber outsole and the EVA midsole as claimed in claim 1, wherein the screw extruder in the step S2 has an operating temperature of 230 ℃ and 250 ℃.

4. The kinds of net films used for the bonding process of rubber outsole and EVA insole, as claimed in claim 1, wherein the spinneret in step S3 is rows of capillaries with a spacing of less than 1mm and a diameter of 0.2-0.4mm, air inlets are provided on both sides of the capillaries, compressed air at 250-300 ℃ is added, when the just formed mixture is extruded out of the spinneret, the hot air is mixed with the surrounding air while flowing downward, so that the melt is spun and cooled and finally consolidated into short and fine fibers, the head end of the compressed air acts on the mixture, the air flow draws the hot filaments to a net structure with a diameter of 1-10 μm at a speed of 540-560m/S, and a microfiber net film adhesive film is formed.

5. The kinds of membranes used for the bonding process of the compression molding of the rubber outsole and the EVA midsole as claimed in claim 1, wherein the pressing temperature in the step S4 is 150 ℃ and 160 ℃, the pressing time is 3-6min, and the pressing pressure is 50-100 kgf.

6. The kinds of membranes used for the bonding process of the compression molding of the rubber outsole and the EVA midsole as claimed in claim 1, wherein the mold closing and pressing time in the step S6 is 10-20min, the temperature is 150-160 ℃, and the pressure is 50-100 kgf.

7. The kinds of membranes used for the bonding process of the compression molding of the rubber outsole and the EVA midsole as claimed in claim 4, wherein the gram weight of the microfiber reticular rubber membrane is 10-200g/m²The hardness is 50-99A, the thickness is 0.01-0.2mm, the width is 6-1600mm, and the melt index of the microfiber reticular rubber film raw material is 10g/10min (150 ℃, 2.16 kg).

Technical Field

The invention relates to the technical field of sole preparation processes, in particular to a bonding process for compression molding of kinds of net films for a rubber outsole and an EVA midsole.

Background

Regarding the adhesion of the rubber outsole and the EVA insole, adhesive films with PET anti-sticking protective films can be suitable for relatively smooth or planar adhesion in the market, however, denier of the existing rubber outsole with side walls or large radian cannot solve the problems basically or the rejection rate is high, the existing adhesive films in the market have the following defects that 1, the air impermeability of the adhesive films in the market is very easy to cause poor adhesion with the rubber outsole or even influence the appearance and the internal quality (bubbles or broken lines and the like) of the rubber outsole, 2, the applicability of the integral adhesive films in the market to the molded body of the rubber outsole is not good, a plurality of molded bodies with high side walls or large radian cannot be used, 3, the waste of the integral adhesive films in the market is more, the cost is higher, 4, the integral adhesive films are harder and are not suitable for being placed in a three-dimensional position, the molded body is limited, the thickness of the adhesive films in the market is easy to cause edge glue overflow, obvious glue lines occur and influence the appearance quality, and therefore kinds of film are proposed for the adhesion process of the rubber outsole and the EVA insole.

Disclosure of Invention

The invention aims to provide kinds of net films for a bonding process for compression molding of a rubber outsole and an EVA midsole so as to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

kinds of net films are used for the bonding process of the compression molding of the rubber outsole and the EVA midsole, which comprises the following steps:

s1, preparing a glue film raw material: selecting mixed particles of ethylene-vinyl acetate with the particle size of 1-3mm, maleic anhydride graft of the ethylene-vinyl acetate, maleic anhydride graft of polypropylene, polyethylene wax and polyethylene;

s2, melt extrusion: melting the mixed particles in the step S1 in a screw extruder, and measuring the output flow of the solution through a metering pump;

s3, melt spinning: the melt which is extruded and metered in the step S2 reaches a melt-blowing die head and is sprayed out through a spinneret of the melt-blowing die head to form a micro-fiber reticular rubber film;

s4, pressing: uniformly spreading the microfiber reticular rubber film formed in the step S3 on the surface of a raw rubber outsole, covering the surface of the microfiber reticular rubber film with a high-temperature-resistant PET protective film, and putting the microfiber reticular rubber film into a rubber outsole mold for pressing to form a cured rubber outsole;

s5, trimming: trimming and polishing the cooked rubber outsole pressed in the step S4 into a finished rubber outsole product, and performing trimming and polishing coarse treatment on the finished EVA insole;

and S6, closing the die, namely placing the finished rubber outsole product in the step S5 into an EVA die for forming a body, placing the finished rubber outsole product into a corresponding EVA middle sole for sole assembly, closing the die and pressing for time, heating for 5-12min, and then cooling with water for 5-12min to form the complete sole.

Preferably, the ethylene-vinyl acetate, the maleic anhydride graft of the polypropylene, the polyethylene wax and the polyethylene in the step S1 are mixed according to the weight ratio of (50-60): (25-40): (0-2): (2-5): (0-5) in proportion.

Preferably, the working temperature of the screw extruder in the step S2 is 230-250 ℃.

Preferably, in the step S3, the spinning nozzles are rows of capillaries with a spacing of less than 1mm and a diameter of 0.2-0.4mm, air inlets are arranged on both sides of the capillaries, 250-.

Preferably, the pressing temperature in the step S4 is 150-160 ℃, the pressing time is 3-6min, and the pressing pressure is 50-100 kgf.

Preferably, in the step S6, the mold closing and pressing time is 10-20min, the temperature is 150-160 ℃, and the pressure is 50-100 kgf.

Preferably, the gram weight of the microfiber reticular rubber film is 10-200g/m²The hardness is 50-99A, the thickness is 0.01-0.2mm, the width is 6-1600mm, and the melt index of the microfiber reticular rubber film raw material is 10g/10min (150 ℃, 2.16 kg).

Compared with the prior art, the invention has the advantages that the reticular rubber film can be suitable for various rubber outsole models of and the adhesion of EVA and EVA materials, the material consumption is small, the cost is greatly reduced, the cost is 20-40% lower than that of the existing rubber films in large quantity, the reticular rubber film is soft, the usable rubber bodies can be used in various types with large radian or high side walls, the reticular rubber outsole can be applicable to , the reticular rubber outsole can be cut in multiple layers, the efficiency is improved, the yield of the rubber outsole is higher, the reticular rubber outsole has air permeability, no air bubbles are generated in the vulcanization process of the rubber outsole, so that the rim charge can be used, the waste is reduced, the cost is reduced, the utilization rate is high, the rim charge can be used in other small parts and the like, and the reticular rubber outsole has outstanding substantive characteristics.

Drawings

FIG. 1 is a block diagram showing the structure of the process flow of the present invention;

FIG. 2 is a schematic structural diagram of the melt-blowing process of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.

Referring to fig. 1-2, the present invention provides the following technical solutions: