Why PET plastic cup will change color
PET plastic cup manufacturers (yameite) pointed out that the cause of change are in many aspects, mainly:
(1) the equipment is not clean. Dust or other dust deposition in the hopper material contaminated discoloration.
(2) offset thermocouple, temperature controller and heating system caused by temperature control failure.
(3) barrel with obstacles, can promote the degradation of plastics; machine barrel and screw of the inner clamping groove metal foreign body, continuous grinding the plastic color.
(1) the mold venting, plastic is adiabatic compression, reacts violently with oxygen under high temperature and high pressure, burn plastic.
(2) the mold gate is too small.
(3) material or mold release agent, lubricant too much. When necessary, regular cleaning barrel, removal of antistatic additives is worse than plastic heat resistance.
(4) the nozzle hole, the sprue and runner size too small.
(1) the screw speed is too high, too much pressure preplasticating.
(2) the barrel and nozzle temperature is too high.
(3) the injection pressure is too high, too long, the injection speed too fast to product color.
Four raw materials
(1) contaminated materials.
(2) high moisture and volatile matter content.
(3) a colorant, additive decomposition.
Xiamen yameite Industry & Trade Co., Ltd. was established in 2004, is a commitment to research and development, production and sale of food with PET plastic packaging, plastic products enterprise, set design, development, production and sales in one, mainly the production of disposable pet cup, cover, plastic boxes, plastic trays and all kinds of disposable plastic food packaging. Fujian province is the most professional PET cup, cover, box and other products manufacturers.
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