How Important Is The Base Film Of Diaper Sanitary Napkin?

How important is the base film of diaper sanitary napkin?

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1. Production technology and characteristics of base film for disposable sanitary products industry
The bottom film generally uses the casting production process. The casting method is a non-stretched, non-directional flat-extrusion film method produced by quenching the melt after passing through a T-die. Because it is used in the sanitary products industry, it is referred to as non-breathable bottom film.

Compared with blow molding: it is characterized by fast production speed, high output, uniform thickness, and excellent hot air performance.

2. In addition to PE film for the base film used in the disposable sanitary products industry, is there any base film made of other raw materials?
Because of its soft texture and low processing temperature, PE is generally used as the substrate.
The base film of the sanitary products industry is basically PE, and other materials such as PP can be added according to performance requirements.

Among them, OPP (biaxially oriented polypropylene film), PE, PET (polyethylene terephthalate) and other substrates can be used on the outer packaging film.

3. How to easily identify breathable and non-breathable membranes
The difference is mainly reflected in the ventilation: methods such as blowing air, covering a cup with hot water with a breathable membrane, and so on.
More in-depth methods: air permeability detection, horizontal and vertical tension differences, etc.
Compared in appearance (with a certain degree of difficulty): The breathable film has a matt appearance, and the surface of the cast film is bright and waxy.

4. How to control the air permeability of the breathable membrane
Metering-mixing, drying-feeding-screw melting-extrusion-casting cooling-preheating-stretching-shaping-cooling-corona-(embossing) --Printing--Slitting--Rewinding
There are many factors affecting the air permeability of the breathable membrane:
1. Equipment technology: equipment stretching ratio, equipment stability, processing conditions (temperature), etc.
2. Raw materials: stability of breathable particles, types and proportions of materials for breathable particles, etc.
Advantages of Hengfeng: Imported equipment for breathable membranes and self-produced breathable particles

5. The development history and future development trend of base film for disposable sanitary products industry

Bottom film development history: cast non-breathable film in the early stage
With the development of breathable film technology, high-weight breathable films (35g sanitary napkins and 32g diapers) have partially replaced cast films and are only used in high-end products. Breathable membranes during this period were mainly imported.
With the rapid development of the sanitary products industry, the country has gradually introduced breathable film production lines, and the domestic technology for the production of breathable particles has become more mature, making the breathable film gradually replace the costly breathable film for the bottom film of sanitary products.

Development trend: 1. Replace cast film 2. Thinner (low weight) 3. Composite non-woven fabric 4. Diversified printing

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