Key points of PET bottle preform injection molding
With the improvement of people's consumption level, the market demand for PET bottle preform packaging products is increasing day by day.
Mineral water bottles, juice bottles, milk bottles, milk beverage boxes, tea cans, functional beverage cans, and other products can be seen everywhere in daily life, all originating from this process.
Therefore, the PET bottle preform injection molding project has enormous development potential and broad market prospects.
Now, the common molding process for manufacturing PET bottle preforms is divided into two steps: 1. Injecting PET into preforms; 2. Reheat, stretch, and blow the preform into the desired shape.
This article will introduce the basic knowledge of PET bottle preform molding. It is hoped that after reading the following three techniques, you can better grasp some precautions and techniques for PET bottle preform injection molding, so that the produced bottle preform can reach a higher quality level.
Regarding PET materials: Polyethylene terephthalate (the material used to make PET bottle preforms) is a common thermoplastic polymer resin used in liquid and food containers, with the following characteristics: 1. It has good mechanical properties, impact strength is 3-5 times that of other membranes, and good bending resistance. 2. Resistant to oil, fat, oleic acid, dilute alkali, and most solvents. 3. It has excellent high and low temperature resistance and can be used for a long time within a temperature range of 120 ° C. It can withstand high temperatures of 150 ° C and low temperatures of -70 ° C in the short term, and its mechanical properties are not significantly affected by high and low temperatures. 4. The low permeability of gas and water vapor not only has excellent gas, water, oil, and odor resistance properties. 5. High transparency, UV blocking, and good glossiness. It is non-toxic, odorless, and has good hygiene and safety, and can be directly used for food packaging. It should be noted that the particularity of PET material is its water absorption, which makes it easier to absorb water from the surrounding environment. If the PET material contains a large amount of water when heated, it will hydrolyze, resulting in the color and brittleness of the produced PET bottle preform. So PET materials must be dried first and then melted into an injection molding machine.
PET bottle preform injection system: The complete set of PET bottle preform injection system includes not only specialized injection molding machines and bottle preform injection molds, but also supporting automatic production auxiliary equipment for bottle preform injection molding, including large PET specialized ovens, dehumidification dryers, automatic feeders, chillers, cooling towers, bottle preform cooling equipment, conveyor belts, and air dehumidifiers. The entire system can be simple or complex, depending on the production capacity and investment budget required by the customer.
PET bottle preform injection molding technology operators: Improving product quality and reducing waste are the basic goals of bottle preform injection molding, which not only depends on the PET bottle preform injection molding system, but also on expert level bottle preform injection molding technology operators. An excellent operator of bottle preform molding technology can promptly identify, handle, and solve problems, ensuring the good operation of the bottle preform injection molding production line. Therefore, relevant operators must master the correct bottle preform injection treatment and troubleshooting methods.
