Sucking disadvantage
Scratches: Dongguan plastic finished with scratch marks on the transparent bubble shell, and especially if the trace is too long, too big, the blister became defective and can not be used for high-grade packaging.
Crystallization point: a transparent plastic sheet production process, due to the small dust in the air, out in the heated plastic material produced by defects, especially in a transparent plastic sheet production process, such defects too large, too much regarded as defective.
Bubbles: plastic sheet production process, due to the heating of the plastic material contains air, produce the finished sheet with bubbles, especially in a transparent plastic sheet production process, this bubble excess shall be regarded as defective.
Water ripple: Dongguan plastic sheet production process, materials and processing technology to produce the finished sheet surface of the water ripples, especially in a transparent plastic sheet production process, this water ripples large, the excess shall be regarded as defective. Under normal circumstances, the thicker the sheet, the water ripples, the more obvious. Qualified PET material there is little water ripples, but most of the PVC has a water ripple phenomenon.
PULL: Dongguan plastic molding production should not have lines and processes, the need to re-modify the mold and add additional pressure on the mold to solve. PULL too large, is seen as defective, and can not be used for high-grade blister packaging, but the turnover in the parts tray field, as long as the PULL neat, does not affect the function should be regarded as a qualified product. PULL is also known as: La Qiu, cramps.