Friends who know a little about chemical engineering know that the production of Pet Preform Mould is significantly more difficult than the formation of large bottles. Because the main purpose of the preform is the test supplies, the quality of the preform directly affects the success rate of the test, and whether the quality of the preform can be manufactured is also a manifestation of the strength of the enterprise.
The preform is the prototype before the formation of the PET bottle. It has a thick wall and high transparency. It can be sealed with a common plastic bottle cap, plus the advantages of being able to stand on the table, and can be used to replace many test tubes. use.
The preform is generally formed by a hot runner mold. It is preferable to have a heat shield between the mold and the injection molding machine. The thickness of the preform is about 12 mm, and the heat shield must withstand high pressure. Exhaust gas must be sufficient to avoid local overheating or chipping, but the depth of the exhaust port should not exceed 0.03mm, otherwise it will easily produce flash.
Production process of preforms:
The quality of the bottle depends on the quality of the preforms supplied. The preforms are divided into two types, one is a long gate and the other is a short gate. Domestic bottle embryo manufacturers use more short-gate preforms, while foreign countries use more long gates. The preform of the long rubber mouth is cut off due to the bottom gate, and the tension is evenly distributed during the blowing process, so that the quality of the bottle to be blown out is better, and the cut portion can be recycled, which is beneficial to save the raw material cost. In today's increasingly scarce petroleum resources, domestic pet preform manufacturers will be more inclined to long gate preforms. The quality of the preform during production is controlled by the degree to which the preform is prevented from being scratched during transport.