Quality Control - Production Process

 

The raw materials used in polyethylene nets are HDPE (High-Density Polyethylene) chips and Master Batches (MBs). HDPE chips are produced from crude oil and are the basic component of the material. MB is an expression used for concentrated additives like colour, UV protectants and other additives mixed with polyethylene. MBs are used to secure the proper mixing of the additives with the HDPE chips.

 

The production of polyethylene nets starts with the mixing of the HDPE chips with the MB.
 

This mixture is transferred to the extruder. The extruder is basically a heated cylinder with a screw inside.

 

The mixture of HDPE chips and MB is placed in one end of the cylinder and is transported through the cylinder by the screw. On the way through the cylinder the temperature and the pressure increase, melting and mixing the chips and the MB. The fluid plastic created in the cylinder is then pressed through the spinderret, creating the primary stage of the yarn. The yarn is immediately let through a water bath to cool down, thereby hardening the HDPE.

After cooling, the yarn is run through the first stretching section, where it is drawn longer and thinner.

 Subsequently, the yarn passes through a heating section where the temperature is raised to create a softer yarn that is then stretched one more time to achieve its final thickness (denier).
 

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