WO2018094608A1

WO2018094608A1 - Production system for joint compression molding of eva and microcellular polyurethane

Info

Publication number: WO2018094608A1
Application number: PCT/CN2016/106921
Authority: WO
Inventors: 李红领; 苏志锋; 谷祥武
Original assignee: 广州艾科新材料股份有限公司
Priority date: 2016-11-23
Filing date: 2016-11-23
Publication date: 2018-05-31

Abstract

A production system for joint compression molding of EVA and microcellular polyurethane comprises two preprocessing units, a cold press (3), and a punching and cutting machine (4). Each preprocessing unit consists of a sheet cutting machine (1) and a sealed oven (2) in an array manner. One cold press (3) is disposed at the rear ends of the two parallel preprocessing units, and the punching and cutting machine (4) is disposed behind the cold press (3). The sealed oven (2) and the cold press (3) are connected by a conveying chain. Manipulators used for picking up sheets are disposed on the two sides of the conveying chain. The two preprocessing units respectively process an EVA sheet and a microcellular polyurethane sheet. A cold pressing die is mounted on the cold press (3), and a circular cooling pipeline is disposed in the cold pressing die. A plurality of uniformly-arrayed die cavities (6) is disposed on a female die (5) of the cold pressing die, and top ejector plates (7) are disposed at the bottoms of the die cavities (6). By using a composite material of the EVA and the microcellular polyurethane that is prepared by the production system, a bonding process using a solvent adhesive in the subsequence can be avoided, thereby greatly improving the environmental friendliness of the technology and shortening a production cycle.

Description

Production system for co-press molding of EVA and microporous polyurethane

Technical field

The invention relates to a production system for press forming, in particular to a production system for co-compression molding of EVA and microporous polyurethane.

Background technique

In order to reduce the cost and improve the economic efficiency, while ensuring the excellent performance of the polyurethane shoe products, it is often desirable to laminate a layer of EVA foam sheet at the bottom of the polyurethane foam sheet to meet market demand. The production of EVA and microporous polyurethane composites is usually first cut into pieces by a cutting machine by a cutting machine, and then cut into pieces by a cutting machine, and then cut into semi-finished products by two kinds of foamed sheets. The material is brushed and bonded, and finally thermoformed by a hot press. In the production process, solvent glue is needed to bond different sheets, which affects the environment. At the same time, it needs to be aired for a period of time after brushing, and the subsequent pressing is performed after the solvent is volatilized, which prolongs the production cycle.

Summary of the invention

In view of the deficiencies of the prior art, the present invention provides a press-forming production system that avoids the subsequent use of a solvent adhesive for the process of bonding EVA and microporous polyurethane, greatly improving the environmental friendliness of the process and shortening the production cycle.

The technical scheme of the invention is: a production system for co-compression molding of EVA and microporous polyurethane, comprising: two pretreatment units, one cold press, one press cutting machine, and the pretreatment unit is cut by one sheet The machine is arranged in a closed oven. Two parallel pretreatment units are provided with a cold press at the rear end, and a cold press is provided with a press cutting machine; the closed oven and the cold press are connected by a conveyor chain, and the conveyor chain is The side is provided with a robot for picking and placing the sheet; the two pretreatment units respectively process the EVA sheet and the microporous polyurethane sheet; the cold press is equipped with a cold pressing mold, and the cold pressing mold is internally provided with a circulating cooling pipe; cold pressing The die of the mold is provided with a plurality of uniformly arranged cavities, and a top plate is arranged at the bottom of the cavity.

Tunnel oven for closed ovens.

The cold press is a hydraulic cold press.

The invention has the beneficial effects that the production system is installed with a new process for transformation, adopts a new production line layout, transforms the pretreatment unit, and then replaces the traditional production process and layout by pressing the cold pressing mold; The composite material of EVA and microporous polyurethane can avoid the subsequent bonding process using solvent adhesive, which greatly improves the environmental friendliness of the process and shortens the production cycle.

DRAWINGS

Figure 1 is a schematic structural view of a production system of the present invention;

2 is a partial structural schematic view of a cold stamping die of the present invention;

In the figure: 1-sheet cutting machine, 2-sealed oven, 3-cold press, 4-punch cutting machine, 5-die, 6-cavity, 7-top plate, 8-top feed through hole.

detailed description

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

As shown in Figures 1 and 2, a production system for co-compression molding of EVA and microporous polyurethane comprises two pretreatment units, a cold press 3, a punching and cutting machine 4, and a pretreatment unit consisting of a sheet cutting machine. 1 and a closed oven 2 arranged, two parallel pretreatment unit rear end is provided with a cold press 3, after the cold press 3 is provided with a punch cutting machine 4; between the closed oven 2 and the cold press 3 is transported Chain connection, two sides of the conveyor chain are provided with a robot for picking and placing sheets; two pretreatment units respectively process EVA (ethylene-vinyl acetate copolymer) sheet and microporous polyurethane sheet; cold press 3 is installed with cold The die is pressed, and a cold cooling die is internally provided with a circulating cooling pipe; the die 5 of the cold press die is provided with a plurality of uniformly arranged cavities 6, and a top plate 7 is disposed at the bottom of the cavity 6. A plurality of top material through holes 8 are arranged at the bottom of the concave die 5 below the top material plate 7. The top material through holes 8 allow the top material rod to pass freely. When the cold pressing mold is stamped, the top material rods are ejected from the top material plate 7 and top. The composite sheet on the panel 7 is manually separated to protect the surface of the composite sheet from the imprint of the top rod. The production system is equipped with a new process for retrofitting, adopting a new production line layout, transforming the pretreatment unit, and then replacing the traditional production process and layout by pressing the cold pressing mold.

The tunnel type heating furnace of the sealed oven 2 of this embodiment.

The cold press 3 of the present embodiment is a hydraulic cold press 3.

The working principle of the production system of the present embodiment: two kinds of foamed sheets are cut by a cutting machine, and the EVA pieces are placed in a closed oven 2 at 160 ° C for heating, and the surface of the EVA sheet is covered with a thin layer of hot melt adhesive. The film was heated for 5 minutes, and the heated sheet was quickly taken out, and the microporous polyurethane sheet was placed on the EVA sheet having the hot melt film surface neatly, and the composite material was placed in a mold of the cold press machine 3. The forming mold is usually hollow, and the cooling water controls the mold temperature at 5 ° C; finally, the composite sheet is punched and cut.

The composite material of EVA and microporous polyurethane prepared by the production system can avoid the subsequent bonding process using solvent adhesive, greatly improving the environmental friendliness of the process and shortening the production cycle.

The above embodiments and the description are merely illustrative of the principles and preferred embodiments of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention. It is claimed within the scope of the invention.

Claims

The invention relates to a production system for co-compression molding of EVA and microporous polyurethane, which comprises: two pretreatment units, one cold press and one press cutting machine, and the pretreatment unit is composed of a sheet cutting machine and a closed oven arrangement. The two parallel pretreatment units are provided with a cold press at the rear end, and a press cutting machine is arranged after the cold press; the closed oven and the cold press are connected by a conveyor chain, and both sides of the conveyor chain are provided with pick-and-place sheets The manipulator of the material; the two pretreatment units respectively process the EVA sheet and the microporous polyurethane sheet; the cold press is equipped with a cold press mold, and the cold press mold is provided with a circulating cooling pipe; the die of the cold press mold is provided with A plurality of uniformly arranged cavities are provided with a top plate at the bottom of the cavity.
The production system for co-compression molding of EVA and microporous polyurethane according to claim 1, characterized in that: a tunnel type heating furnace for a closed oven.
The production system for co-press molding of EVA and microcellular polyurethane according to claim 1, wherein the cold press is a hydraulic cold press.