Manufacturing method of foam with air holes

Abstract

The making process of foamed body with air permeable holes includes the steps of setting the material to be foamed inside a mold with needles, heating and pressurizing the mold for foaming and cross-linking, cooling the mold and demolding. The foamed body may be further cut to required sizes. Or, the material may be first heated and pressurized inside one first mold to form the initial blank, and then foamed and cross-linked in the second mold with needles to obtain the foamed body with air permeable holes.

Description

technical field [0001] The invention relates to a foam gasket, in particular to a method for manufacturing a foam with air holes which can form a plurality of air holes when the foam is formed. Background technique [0002] Generally, insoles made of polyurethane (PU) will naturally form a large number of pores after molding, so the air permeability is good, but the price of polyurethane is more expensive, which will increase the manufacturing of insoles Cost, on the other hand, when ethylene-vinyl acetate copolymer (EVA) is used as a material, it has the advantage of low cost, but it is not breathable, so holes must be opened to improve its breathability. Such as figure 1 Shown, the manufacturing method of existing a kind of ethylene-vinyl acetate copolymer insole sheet is to prepare an upper mold base 1 and a lower mold base 2 with a mold cavity 201 concavely on the top surface, then, the upper and lower mold bases 1, 2 are closed, and an ethylene-vinyl acetate copolymer...

AI Technical Summary

Problems solved by technology

[0004] 1. When the solid needle 6 is used to squeeze and pierce the insole 5, the solid part of the insole 5 will be compacted and the insole 5 will lose its elasticity

[0005] 2. When the hollow needle 7 is used to cut and pierce the insole 5, the waste 502 cut off by the hollow needle 7 cannot be recycled, resulting in waste of materials

[0006] 3. The blank 3 is heated and pressurized by the upper and lower mold bases 1 and 2 to complete foaming and crosslinking. However, when the volume and thickness of the blank 3 are larger, the closer to the inner surface of the mold cavity The reaction is faster, and the reaction of the part close to the center is slower. In order to achieve complete reaction, the heating time must be prolonged, which consumes more energy

[0007] 4. Regardless of whether the through-hole 501 is formed by the solid needle 6 or the through-hole 501 is formed by the hollow needle 7, the inner ring surface of the through-hole 501 will have rough scratches due to extrusion, cutting and piercing, and the hole pattern is not complete.

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