Author：Baby & Adult Diaper Materials FROM：Diaper Materials Manufacturer TIME：2023-03-02
The manufacture of microporous breathable film can be divided into blown film method and casting method according to different film making processes; according to different stretching processes, it can be divided into uniaxial stretching method, biaxial stretching method and local stretching method. Compared with ordinary PE cast embossed film, the manufacture of pe pouch film has higher technical requirements. In the production process of pe pouch film, the following aspects need to be paid attention to.
(1) Selection of resin
Stiff breathable film - high density polyethylene; flexible breathable film - low density polyethylene; high stretch breathable film - high strength polyethylene; printing (color registration, positioning cutting) - high strength polyethylene
(2) Selection of calcium carbonate
Surface treatment of calcium carbonate: fluidity, extrusion stability, die coking, pinholes, film mechanical properties, etc.
Selection of calcium carbonate particle size: tensile properties, moisture permeability, uniformity, processability
The selection of raw materials directly affects the processability of the PE coating (such as coking time, extrusion stability, manufacturability of thin films and pinhole defects, etc.) and physical properties (such as air permeability, water pressure resistance, thermal stability and mechanical properties). performance, etc.). Therefore, it is the first consideration in the selection of raw materials to suit the customer's physical property requirements for the film and the matching status with the processing equipment.
The high humidity of the raw material is the main reason for the occurrence of holes in the pe pouch film and the coking of the T film, which will seriously affect the production efficiency and product quality of the breathable film. Therefore, the production of breathable film not only requires dehumidification of raw materials (<250ppm), but also requires strict humidity control requirements for raw material transportation and flash recovery systems.
Stretching has a magnifying effect on the deviation of the extrusion thickness, so the control of the extrusion thickness is the premise to ensure the uniformity of the final pe pouch film thickness.
There are two necessary conditions for the manufacture of pe pouch film, one is calcium carbonate, and the other is stretching. Therefore, stretching is crucial in the manufacture of breathable membranes. The stretching temperature, stretching ratio, stretching rate and stretching gap are the four elements of the stretching process. Its overall balance will have a great impact on the air permeability, mechanical properties, consistency and appearance of the breathable film.
Using heat treatment to recover and relax the rigid polymer segments after stretching is a necessary means to improve the stability of pe pouch film in the subsequent process and use.
PE pouch film is an environment-friendly, breathable (vapor) water-repellent (liquid, bacteria, dust) functional material, which is made by adding inert fillers to PE carrier, film-forming and stretching. Currently, it is widely used in personal hygiene care products. Understanding the production technology principles of pe pouch film will help people better understand this functional material.
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