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Heat shrinkage tube extrusion production is prone to abnormal phenomenon

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I read an electronic magazine in which there is a report on heat shrink tube. After reading, I became interested in this topic, so I searched some relevant materials and information about it, but found that it is not specific at all. Today I come to this forum to turn to you to discuss my understandings are appropriate.



Here are my personal understandings:

Heat shrinkage tube extrusion production is prone to abnormal phenomena, causes and solutions

A, abnormal phenomenon: pipe extrusion surface rough reasons:

1, in the production of smaller specifications of the pipe when the melt fracture

2, mixed uneven

3, the material there is moisture

4, the extrusion temperature is low

5, the masterbatch of its melt strength is poor (such as halogen-free masterbatch)

To solve the problem:

1, to increase the length of the straight part of the die, or reduce the screw speed

2, to improve the extrusion pressure, fully mixed or the use of shallow thread screw

3, the use of masterbatch to be fully dry

4, to improve the extrusion temperature

5, adjust the masterbatch, improve the masterbatch extrusion melt strength

B, abnormal phenomenon:

The vertical wall thickness fluctuations reasons:

1, the extruder is running uneven, uneven material, extruder material uneven

2, the traction device running fluctuations

3, the temperature changes caused by the solution:

1 , Adjust the extruder speed, mixing evenly, the extruder under the mouth to control the barrel temperature, to prevent the phenomenon of melt bonding. Consider the size of the masterbatch particles and, if necessary, reduce the size of the masterbatch particles.

2. Correct the stability of the traction device and the traction roller

3, Adjust the temperature of the material and mold, and adjust the extrusion pressure

C, abnormal phenomenon:

Extruder die powder material serious reasons:

1, the use of masterbatch in the plastic melt after the poor mobility

2, the mold extrusion temperature is high

3, the extrusion die mandrel And die in the scraper material

To solve the method:

1, strict control of the processing properties of masterbatch, including (processing additives use, type) MFR index detection

2, adjust the mold extrusion temperature

3, the use of tools on the mold scraping Wound for polishing

Ps: Excuse me if I was wrong in words or expressions as I am a green hand in the field of heat shrink tubes. I need continual learnings.

What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated.

May someone would like to help ?

thanks in advance.



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