What is a preform

　　The preform is the prototype of the Pote bottle before it was formed. It has a thick wall and high transparency. It can also be sealed with a common plastic bottle cap. In addition, it can be broken and can stand on the table. It can be used to replace many test tubes. use.

　　Preform molding

　　Bottle preforms are generally formed with hot runner molds. It is best to have a heat shield between the mold and the injection molding machine template. Its thickness is about 12mm, and the heat shield must be able to withstand high pressure. Exhaust must be sufficient to avoid local overheating or chipping, but the depth of its exhaust port should generally not exceed 0.03mm, otherwise flashing is likely to occur.

　　Production process of preform

　　The quality of the bottle depends on the quality of the supplied preforms. There are two types of preforms for injection molding, one is a long plastic mouth, and the other is a short plastic mouth. Domestic preform manufacturers often use short plastic mouth preforms, while abroad use long plastic mouth more. The preform with a long plastic mouth is cut off because of the plastic mouth at the bottom, so that the tension is evenly distributed during the blowing process, so that the quality of the blown bottle will be better, and the cut part can be recycled, which is conducive to saving raw material costs. In today's increasingly scarce oil resources, domestic manufacturers will be more inclined to preforms with long plastic mouths. The quality control of preforms in the production process depends on the degree of control of the preforms to avoid being scratched during transportation.