Pet Preform have a lot of production techniques, and as the times continue to develop, the technology of production is constantly changing and becoming more diverse. Extrusion molding Extrusion While other forms of plastic molding use extrusion to insert plastic resin into the mold, extrusion molding extrudes the molten plastic material directly into the mold. This process is unique because the shape of the mold determines the shape of the final product, not the mold. Extrusion is ideal for making parts with continuous lengths and uniform cross sections. Similar to a plastic injection molding machine, the extrusion molding machine has a screw that rotates the plastic resin into the feeder. The molten plastic then moves through the mold to form a long tubular shape. The shape of the mold determines the shape of the plastic tube. After the extrudate is cooled, it is taken out of the machine. Extrusion is ideal for long hollow forming applications such as tubes, tubes and pipettes. In addition, manufacturers can create many different shapes of parts, including T-sections, U-sections, square sections, I-sections, L-sections, and circular sections. Injection molding Injection molding is considered to be the most versatile in the various molding processes available because it can be used to make parts of various sizes and shapes. Presses are also available in different sizes depending on pressure and tonnage. The basic principle of injection molding is fairly simple, but when it comes to maintaining part consistency, the actual process can be quite complex. This process involves injecting molten plastic into a mold made of steel. The mold itself has a cavity that will form the part; once injected, the molten plastic fills the cavity and the rest of the mold. Once cooled, the part will be pinned out. Due to its excellent versatility, injection molding can be used to make everything from small automotive parts to small, complex parts used in surgical equipment. Injection molding also allows for a high degree of customization because a variety of plastic resins and additives can be used, allowing designers and engineers to create unique components to meet highly complex or unusual application needs. For manufacturers who want to make more specialized parts, there are some enhancements and technologies to choose from, such as a range of resin and finish options. Although it may be expensive to make the mold yourself, once the production is completed, the production cost will become quite low. In fact, injection molding is best suited for the manufacture of a large number of precision parts; once production begins, the cost per component can be significantly reduced, making the process economical for high volume operations. Plastic injection molding is a very reliable solution for producing a large number of precise, consistent parts. It is also more efficient and cost effective than other stylings because it produces much less waste. Therefore, injection molding is most commonly used to mass produce high quality parts. Rotary casting Rotational molding, also known as rotational molding, uses high temperature and rotational motion to coat the interior of the mold to form the desired shape of the part. First, the mold is filled with polymer powder. The heated mold is then rotated on two vertical axes so that the powder adheres to the entire interior of the mold. As it continues to rotate, the mold is finally cooled and removed, eventually forming a uniform walled part. Rotational molding is best suited for the manufacture of large, hollow, one-piece containers such as cans. Although cost-effective, this is not a fast-growing process. However, rotomolding hardly wastes material, and excess material is often reusable, making rotomoulding an economical and environmentally friendly manufacturing process. Other key advantages include the ability to produce parts with consistent wall thickness, enhanced design flexibility and high strength. Jilian Plastic Mould is our professional China Pet Bottle manufacturer with rich production experience. At the same time, we are also innovating and researching and developing our products according to the development of the market, improving our own production technology and striving for consumers. Bring more quality and reliable products.