Cause Analysis and Countermeasures of Bending in PC Extrusion Diffuser Production

In the extrusion production process of PC extrusion diffuser, there is often a bad situation of bending. So, what is the cause of the bad? How can we reduce this kind of bad in the production process? Our JE company has greatly improved the qualification rate of our PC extrusion diffuser after years of extrusion production.

1. Uneven wall thickness
Uneven wall thicknesses can cause PC diffusers to warp as they cool. For the causes and countermeasures of uneven wall thickness, please refer to our previous news "Cause Analysis and Countermeasures of Uneven Wall Thickness in the Production of PC Extrusion Diffusers".

2. Uneven cooling or insufficient cooling
The PC molten material extruded from the die is in the shaping die, and heat exchange and cooling shaping are carried out by cooling and vacuum adsorption. If the cooling of each part of the PC diffuser is inconsistent, the cooling and shrinkage of each part will lead to the PC diffuser. Bending; or after the PC diffuser is out of the stereotyped mold and the stereotyped water tank, the local temperature is still high and not completely cooled. When the PC diffuser continues to cool, the local shrinkage of the PC diffuser will still cause the PC diffuser to bend.
Countermeasures: reduce the temperature of the cooling water, check whether the cooling water path is smooth, adjust the flow of the cooling water, increase or block the water holes.

3. Uneven distribution of resistance of stereotypes
The molten PC raw material will have a certain resistance due to cooling and shrinkage in the shaping die. If the resistance distribution is very different, the PC diffuser will be inconsistent in the shaping die due to the influence of local resistance, causing the PC diffuser to bend.
Countermeasure: Repair the stereotyped model and increase or decrease the resistance.

4. Inconstant traction speed
The non-synchronization and speed of the tractor make the thickness of the molten PC raw material uneven, which causes bending after cooling and shrinking.
Countermeasures: Overhaul the tractor and adjust the traction speed.

JE is a factory specializing in LED plastic diffuser production, for more details, please refer to:
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