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The Reliable Jilian Pet Preform Manufacturers

May 22, 2019 by preform nicole  

The first stage of bottle manufacturing is stretch blow molding. The polyester is heated and placed in a Pet Preform Mould in which the polyester assumes the shape of a slender tube. (The process by which PET is pressed into the mold is called injection molding.) The polyester tube, now called the parison, is then transferred to a second bottle mold. A thin steel bar called a mandrel slides inside the parison, where it fills the parison with high-pressure air, and the stretch blow begins: the parison is blown and stretched into the mold due to compressed air, heat and pressure, Presents the shape of the bottle. In order to ensure a consistent flat shape of the bottom of the bottle, the individual components of the PET are simultaneously attached to the bottle during the blow molding process.

The mold must be cooled relatively quickly so that the newly formed part is properly set. There are several direct and indirect cooling methods that effectively cool the mold and PET. Water can flow through the pipes around the mold, indirectly cooling the mold and PET. Direct methods include the use of compressed air or carbon dioxide directly on the mold and PET.

Once the bottle (or, in continuous production, the bottle) is cooled and solidified, it can be removed from the mold. If a continuous molding process is used, the bottles need to be separated by trimming the PET between them. If a non-continuous process is used, sometimes excess PET will penetrate the mold during the manufacturing process and needs to be trimmed. After the bottle is removed from the mold and the excess PET is removed, the bottle can be transported.

 

We choose Gianlian Mould, we are a very reliable and reliable Pet Preform Manufacturers, we believe that with our comprehensive help, you can also get a satisfactory product and enjoy our comprehensive service.