What are the production environment conditions of PET preform mould?

As PET preform moulds have the advantages of light weight, good toughness, easy formability and low cost, more and more plastics are used to replace glass in modern industry and daily products, especially in optical instrument and packaging industry. development is particularly rapid.

What are the production characteristics of PET preform moulds?

What are the production arrangements for PET preform moulds?

What are the production environment conditions of PET preform mould?

What are the production characteristics of PET preform moulds?

1.The hygroscopicity of the PET preform mould is slightly higher than that of PBT, and the pellets are more sensitive to water at high temperatures. If the water content exceeds the standard, hydrolysis occurs during the molding process, which greatly affects the quality. Therefore, the raw material must be dried before the forming process.

2.The crystallinity of the PET preform mould is smaller than that of PBT and decreases with increasing relative molecular weight, so that the molding cycle is longer and cannot be formed as quickly as PBT.

3.The mold shrinkage rate of PET preform moulds is relatively large, generally about 1.8%, and glass fiber reinforced PET is 0.2% to 1.0%..

4.PET products often retain some residual stress, so post-molding is often required.

What are the production arrangements for PET preform moulds?

1.When the high frequency splicing device is on, set the temperature to about 60°C. The temperature should not be set too high. After preheating for about ten minutes, touch the heating plate with your hands to have heat to turn off the temperature controller.

2.Adjust the high frequency current to just enough to weld tightly and form bubbles;

3. Follow the above two steps to solve the problem under normal circumstances.

What are the production environment conditions of PET preform mould?

1. Melting temperature

Can be measured by air shot method. 270-295 ℃, the improved GF PET can reach 290-315 ℃ etc. are set.

2. Injection speed

In general, the injection speed should be fast, which can prevent premature solidification during injection. But too fast, the high shear rate makes the material brittle. Shots are usually completed within four seconds.

3. Backpressure

The lower the better so as not to wear out. Generally not more than 100bar. Normally not required.

4. Residence time

Do not use excessive dwell times to prevent molecular weight loss. Avoid temperatures above 300°C. If the downtime is less than 15 minutes. It only needs to be fired from the air; If it takes longer than 15 minutes, it should be cleaned with viscosity PE, and the temperature of the cylinder should be lowered to the PE temperature until it is turned on again.

Like the ZANBOND Group, it has focused on the technical transformation of PVC and the industrial field of manufacturing, setting up a whole range of standardization systems for the development of granulate formulations, laboratory material testing, mold development, machine equipment innovation. Products are widely used in environmental, construction, transportation, daily needs and other fields.