PET preform mould, preform mould maker in China

Our company has been developing PET preform moulds that are available to customers worldwide since ten years ago.

Moreover, we have also provided preform molds of the highest quality at competitive prices, using only the best materials possible, and having a good working relationship with local and overseas customers.

Topworks, a plastic mold company, specializes in manufacturing custom preform molds using modern technologies to ensure the highest quality preform molds.

For more than ten years, TopWorks has made plastic injection molds in China, gaining a great deal of experience.

In this way, our company has developed a significant amount of expertise and knowledge that enables customers to be assured of receiving the highest level of service, efficiency, and dedication in preform moulding.

Whatever your requirements may be, Topworks has the ability to produce a complete set of PET preform moulds promptly, with accuracy, at an affordable price, no matter how detailed or intricate.

Besides the ability to design and assemble the PET preform mould according to the customer's specific needs and the capability to make each PET preform according to the customer's requirements, it is also possible to print each PET preform with a particular design.

Our team

It is the dedicated and experienced workforce of Topworks specializing in more than one division to ensure the design and build of moulds to create unique features tailored to diverse kinds of plastic PET preforms. With a comprehensive set of plastic preform mold manufacturing capabilities, we manufacture a broad range of molds in a comfortable working environment.

As well as our preform available here in our facility, the products can be made right here, or we can create a customized preform mould made from PET for you, to effectively produce your desired packaging. With this service, everything you need to be made here can be achieved in the same location.

 

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How to use PET preform mould?

Polyethylene terephthalate (PET) is a naturally occurring thermoplastic polymer commonly used in plastic products. As of today, GF-PET is the most popular polymer among customers, which is mainly used in preform injection.

Consequently, the properties of PET in a liquid state are much better, and pressure is more important than temperature in terms of viscosity. In this situation, the fluidity of the melt is often affected mainly by pressure.


Plastic Processing


Due to its lipid-related nature and its hydrophilicity, PET pellets are very sensitive to water at high temperatures. Also, due to their presence, PET has a phospholipid-based structure. PET loses molecular weight when moisture levels exceed the limit; the product turns color and becomes brittle.

It requires drying at 150 °C for at least four hours, generally 170 °C, over three to four hours, before processing. Recyclable materials should be no higher than 25%, and they should be thoroughly dried before use.


Injection Molding Machine


Injection systems with temperature control sections and low friction heat are required since PET has a stable time after melting and high melting point, and the actual weight of the plastic should be 2/3 of the one-shot amount of machine injection.


Mold and Gate Design


Hot runner molds are used to manufacture PET preforms. A heat insulator is sometimes placed between the hot runner mold and the injection molding machine. Preforms are about 12 mm thick, while insulators have to withstand high pressure.

The venting slot depth must not exceed 0.03mm; otherwise, the flash will easily occur.


Melting Temperature


The optimum temperature range can be set between 270 and 295 ° C using a shot-to-air method.

Enhance grade GF-PET can be set at 290-315 ° C.


Injection Speed


An injection speed of 2 to 4 seconds is usually adequate to prevent early coagulation in the material. But too fast can make it brittle. The shot takes four seconds.


Back Pressure


It's best to inject at low pressure, no more than 100bar, so the injection doesn't wear off.


Residence times


Keep temperatures below 300 °C and avoid residence times over 15 minutes to prevent molecular degradation. The barrel should only be air-blasted for 15 minutes; if more time is needed, clean it with viscosity PE and turn the barrel temperature down to PE temperature.


Others


It is important not to use too much recycled material in case it will negatively influence plasticization.


It is possible to produce "white fog" and opaque if the mold temperature is not well controlled.

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