What are PE and PP film blowing machines?

PP is the abbreviation of polypropylene, and its Chinese name is polypropylene.

PP film blowing machine is mainly composed of extruder, head, die, cooling device, foam stabilizer, herringbone plate, traction roller, coiling device, etc

1. Extruder: the extruder is mainly composed of screw, barrel, hopper, deceleration and driving motor. The driving motor adopts electromagnetic speed regulating motor (or frequency conversion ordinary motor), which drives the reducer through belt drive to make the screw rotate in the barrel; When the plastic particles in the hopper are heated externally, the molten plastic is extruded from the die mouth of the die head through three-way filtration

2. Tee, composed of filter screen, filter plate and tee gland;

3. Die head;

4. The cooling device is composed of cooling air ring, air duct, blower, etc;

5. Traction, composed of traction frame, herringbone plate, traction roller, coiling mechanism, traction motor and other main components;

6. For the electrical control part, the general unit is equipped with the unit operation cabinet. The main button is pressed to turn on the main power supply and turn on the main switch of the motor. The electric heating of the body, tee and each button of the die can be controlled respectively through the sub button switch. The two groups of coils in the key part adopt thermocouple automatic temperature measurement and automatic temperature control. In the normal production process, the temperature can be controlled automatically to ensure the stability and reliability of the production process.

characteristic:

Take Guoyan brand PP film blowing machine as an example: the barrel and screw of the extruder are made of high-quality alloy steel, which has the best hardness and corrosion resistance after nitriding and precision processing.

Film blowing mode: down blowing water cooling method is adopted to make the film achieve high transparency.

The coiling device adopts pressure friction coiling or central coiling, which is adjusted by torque motor. The coiling is flat and easy to change.

PE:

The selection of polyethylene blow film material for PE plastic blow film machine mainly refers to the following two points:

1. The raw material selected for PE plastic film blowing machine shall be blown film grade polyethylene resin particles containing an appropriate amount of smoothing agent to ensure the opening of the film.

2. The melt index (MI) of resin particles cannot be too large. If the melt index (MI) is too large, the viscosity of molten resin is too small, the processing range is narrow, the processing conditions are difficult to control, the film-forming property of resin is poor, and it is not easy to process into film; In addition, the melt index (MI) is too large, the relative molecular weight distribution of the polymer is too narrow, and the strength of the film is poor.

Preparation and precautions for PE plastic film blowing machine before startup:

1) PE plastic film blowing machine shall check whether the unit is installed as required and whether all bolts are fastened well;

2) Check the power supply and electrical parts of PE plastic film blowing machine, and all parts shall be safely grounded;

3) Check and fill the lubricating oil in the reduction gearbox and air compressor of PE plastic film blowing machine, and check the lubrication of mechanical transmission parts;

4) The material of PE plastic film blowing machine shall be dried, otherwise it shall be pre dried;

5) Check that there is no foreign matter in the blanking, and there is no scrap iron or other unqualified materials in the raw materials;

6) If the barrel is not filled with plastic or the temperature does not meet the requirements, it is prohibited to start;

7) Check that the heating system and temperature measurement system of the unit are intact;

8) During startup, irrelevant personnel shall leave to prevent local overheating and burning of materials; Prevent the belt and mixing drum from being punctured; Prevent hair and clothes from being rolled in.

The difference between PE film blowing machine and PP film blowing machine: PE is air-cooled, PP is water-cooled and air-cooled, and their screw structure is also different.