Common faults and solutions for PO film in use

2021-01-09 00:17:44

PO film is the most commonly used type of greenhouse film, and it is also the most popular one. However, even the best things will inevitably have problems in the process of use. The following is a brief introduction to the common faults and solutions of PO film in use.

1. Thin film transparency

Reasons and methods:

1 The extrusion temperature is low, the resin is poorly plasticized, resulting in poor transparency of the film after blow molding; the extrusion temperature is appropriately increased to enable the resin to be uniformly plasticized;

2 The cooling effect is not good, which affects the transparency of the film; the air volume should be increased to improve the cooling effect;

3 The moisture content in the resin raw material is too large; the raw materials need to be dried first;

4 The pulling speed is too fast and the film is not cooled enough. This appropriately reduces the traction speed.

2. Wrinkles in the film

Reasons and methods:

1 film thickness is not uniform; adjust the thickness of the film to ensure uniform thickness;

2 The cooling effect is not enough; the cooling effect is improved to ensure that the film can be sufficiently cooled;

3 The inflation ratio is too large, causing the bubble to be unstable, swinging back and forth, and easily wrinkles, and appropriately reducing the inflation ratio;

The angle between the 4 herringbone plates is too large, and the bubble is flattened within a short distance, so the film is also prone to wrinkles; the angle of the herringbone plate is appropriately reduced;

5 The pressure on both sides of the traction roller is inconsistent, and the height of one side is low; the pressure of the traction roller is adjusted to ensure uniform force of the film;

6 The axes between the guide rollers are not parallel, which affects the stability and flatness of the film, and wrinkles occur. Check the axes of the guide shafts and make them parallel to each other.

3. The film has a foggy water pattern

Reasons and methods:

1 The extrusion temperature is low, the resin is poorly plasticized; the temperature setting of the extruder is adjusted, and the extrusion temperature is appropriately increased;

2 The resin is damp and the moisture content is too high. Drying the resin raw material generally requires that the water content of the resin should not exceed 0.3%.

4. Uneven film thickness

Reasons and methods:

1 The uniformity of the die gap directly affects the uniformity of the film thickness. If the die gap is not uniform, some parts have larger gaps, and some parts have smaller gaps, resulting in more or less extrusion. The film thickness is also inconsistent, some parts are thin, some parts are thick; adjust the gap of the die head to ensure uniformity everywhere;

2 The temperature distribution of the die is uneven, high and low, so that the film thickness after blow molding is uneven; the temperature of the die head is adjusted to make the temperature of the die part uniform;

3 The air supply volume around the cooling air ring is inconsistent, resulting in uneven cooling effect, resulting in uneven thickness of the film; adjusting the cooling device to ensure uniform air output at the air outlet;

4 The inflation ratio and the traction ratio are not suitable, so that the bubble thickness is difficult to control; the inflation ratio and the traction ratio are adjusted;

5 The traction speed is not constant and changes constantly, which of course affects the thickness of the film. Check the mechanical transmission so that the traction speed remains constant.

5. The film has poor heat sealability

Reasons and methods:

1 The dew point is too low, the polymer molecules are oriented, so that the performance of the film is close to the oriented film, resulting in a decrease in heat sealing performance; adjusting the amount of wind in the wind ring, making the dew point a little higher, blowing as much as possible under the melting point of the plastic Expansion and traction to reduce the molecular stretching orientation caused by inflation and traction;

2 The inflation ratio and the traction ratio are not appropriate (too large), and the film is stretched and oriented, thereby affecting the heat sealing performance of the film. The inflation ratio and the traction ratio should be appropriately small. If the inflation ratio is too large and the traction speed is too fast, the transverse and longitudinal stretching of the film is excessive, then the film properties tend to be biaxially stretched, and the film heat is applied. The seal will be worse.

6. Bubble instability

Reasons and methods:

1 Extrusion temperature is too high, the fluidity of the molten resin is too large, the viscosity is too small, and it is easy to cause fluctuation; the extrusion temperature is adjusted;

2 The extrusion temperature is too low, the discharge amount is small; the extrusion temperature is adjusted;

3 The air volume of the cooling air ring is unstable, and the bubble cooling is not uniform; check the cooling air ring to ensure that the air supply volume around is uniform;

4 was affected by the interference and influence of strong external airflow. Prevent and reduce interference from outside airflow.

7. The surface of the film is rough and uneven

Reasons and methods:

1 The extrusion temperature is too low, the resin is poorly plasticized; the temperature setting of the extrusion is adjusted, and the extrusion temperature is appropriately increased to ensure good plasticization of the resin;

2 extrusion speed is too fast. Properly reduce the extrusion speed.

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