Preparation method of EVA foamed thin film

Abstract

The invention discloses a preparation method of an EVA foamed thin film. The method includes the steps of preparing a foaming master material, preparing a foaming promoting master material and conducting extruding, blow molding and foaming of the thin film. When the master material is prepared, the foaming master material is prepared through a low-temperature extrusion method so that foaming in the extrusion granulating process can be avoided; by means of the foaming promoting master material, foaming agents can be promoted to decompose as completely as possible in the film blowing process; the two types of master materials and EVA resin are evenly mixed according to the ratio of 1 to 1 to 10 and then added into an extruder to be plasticized and blown to form the film. The master materials are foamed during plasticizing and extruding, and the structure and shape of foams can be adjusted by adjusting the main machine speed and the traction speed. According to the method, the film foaming product can be easily obtained. The film foaming product is suitable for producing rubber feeding bags, low in melting point, easy to tear off, small in density, capable of lowering material consumption, and capable of reducing production cost. Due to the fact that the product is good in mechanical property and tear-off performance, the application range of the product can be further enlarged; when the film is applied to rubber small component packaging bags and the like, resource waste can be greatly reduced, and recycling can be improved.

Description

technical field [0001] The invention relates to a method for manufacturing film foaming, in particular to a method for manufacturing rubber feeding bag film foaming. Background technique [0002] Foam materials, such as sponge, have many advantages such as light weight, excellent performance, and low production cost, and are widely used in various industries, such as various elastic protective products, mattresses, seat cushions, shockproof pads, etc. [0003] Existing rubber feeding bags are generally obtained by extruding and blowing film from LDPE resin through an extruder. This kind of existing rubber feeding bags has high melting point, poor opening, and poor dispersion, which has an impact on rubber components. , It is not suitable for direct application of rubber feeding. At present, various methods of blending or adding additives are used to improve these shortcomings. This method is generally mixed with a low-melting resin, and also by adding various additives. Usi...

AI Technical Summary

Problems solved by technology

[0004] The above improvement methods are relatively complicated, and the effect is generally poor, affected by factors such as cost, process difficulty, and high labor cost; the current general-purpose rubber feeding bags are generally poor in performance and high in price, and it is difficult to reduce the cost of rubber products. Cost of production