Production method for EVA waterproof membrane, and plastic suction die thereof

Abstract

The invention discloses a production method for an EVA waterproof membrane, and a plastic suction die thereof. The production method comprises the following steps: a. loading, specifically, conveyingan EVA sheet to the space above the plastic suction die; b. clamping, specifically, tightly pressing the EVA sheet onto the plastic suction die by virtue of a clamp; c. heating, specifically, heatingthe EVA sheet by virtue of a heating device, and blowing air towards the EVA sheet by a suction die; d. carrying out plastic suction, specifically, changing air blowing into air suction by the plasticsuction die, and carrying out plastic suction on the heated EVA sheet; and e. punching, specifically, cutting off the EVA waterproof membrane sucked into the plastic suction die from the EVA sheet byvirtue of a punching die, wherein the plastic suction die comprises a lower die plate and a lower die holder; the lower die plate is installed on the lower die holder, a cavity is formed in the uppersurface of the lower die plate, and air vents penetrating through the lower die plate are formed in the cavity; and a ventilation pipe is arranged in the lower die holder, an air cavity is formed between the lower die holder and the lower die plate, and an air blowing component and an air suction component are connected to the second end of the ventilation pipe. According to the production method, the smoothness of plastic suction for the EVA waterproof membrane is improved, and the breakage probability of the EVA waterproof membrane in the plastic suction process is lowered.

Description

technical field [0001] The invention relates to a manufacturing method of an EVA waterproof membrane and a blister mold thereof. Background technique [0002] At present, the environmental requirements for the members of the car are getting higher and higher. In order to give the members of the car a comfortable and quiet driving experience, more and more OEMs tend to use EVA waterproof membranes. [0003] In the prior art, there are many difficulties in the production of the waterproof membrane made of EVA material. 1. The waterproof membrane made of EVA material sags greatly after heating, resulting in poor molding quality on the blister mold of the vacuum forming machine, that is, it will There is a problem of wrinkles; 2. The EVA material has poor elongation performance, which leads to the problem that it is easy to absorb and break during the process of blister molding. Contents of the invention [0004] Aiming at the deficiencies of the prior art, the present invent...

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Problems solved by technology

[0003] In the prior art, there are many difficulties in the production of the waterproof membrane made of EVA material. 1. The waterproof membrane made of EVA material sags greatly after heating, resulting in poor molding quality on the blister mold of the vacuum forming machine, that is, it will There is a problem of wrinkles; 2. The EVA material has poor elongation performance, which leads to the problem that it is easy to absorb and break during the process of blister molding

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