What is PET preform?
PET preform is a typical injection molding product, which is easy to transport, mostly of plastic material, with uniform texture and good insulation. It is an intermediate product of plastic bottles and machine barrels.
PET preform material
Polyethylene terephthalate is the main varieties of thermoplastic polyester, It's named Polythylene terephthalate (hereinafter referred to as PET or PETP or PET), commonly known as polyester resin. It is a polycondensation of terephthalic acid and ethylene glycol. Together with PBT, it is called a thermoplastic polyester, or a saturated polyester. PET is milky white or yellow before the highly crystalline polymer, the surface smooth and shiny. It has the characteristics of creep resistance, fatigue resistance, friction and dimensional stability, small abrasion and high hardness, and has the greatest toughness in thermoplastics. It has good electrical insulation performance and little impact on temperature, but it has poor corona resistance. Non-toxic, resistant to climate, good stability of anti chemical drugs, low water absorption, weak acid and organic solvents.
PET preform are widely used, widely used in daily necessities, daily packaging and other fields. The PET preform is formed by blow plastic bottles, re processing including cosmetics, medicine, health care, beverages, mineral water, the reagent packing bottle, the bottle is called the two step method, which is formed by injection molding processing method of preform, again after formation of PET plastic bottle blow molding processing.
We are not unfamiliar to the PET preforms, It is intermediate between plastic materials and plastic bottles, in batch production when the need for these intermediates are simple storage, here we take a look at these intermediates need to pay attention to what in the storage time?
The PET preforms is not a fragile thing, but in the store is also need to pay attention to, can not stick to storage, it will make it get a lot of dirty things, these in later time is inside the bottle into the stain, not good-looking, although does not affect the use, but always give a person a kind of inferior material feeling, so be stored off the ground, there is a note to avoid placing the sun long time exposure, this will make the side of it is extremely fragile, will fade, not producing the products, it can not continue to use the variable.
In general, the PET preforms is a better material for storage, and the material causes it to be insulated for a lot of damage.
The composition and structure of the mould
Although the structure of mould is changeable due to the variety and performance of plastics, the shape and structure of plastic products, and the type of injection machine, the basic structure is consistent. The mold is mainly composed of the pouring system, the temperature regulating system, the molding parts and the structural parts. The gating system and molding parts are in direct contact with the plastic parts and products as plastics and change, is the most complex in the mould, the biggest change, part of the processing requirements of the highest accuracy and smoothness.
The injection mold consists of two parts: dynamic mold and fixed mold. The movable mould is installed on the mobile template of the injection molding machine, and the fixed mould is installed on the fixed template of the injection molding machine. In the injection molding, the dynamic and fixed die closed form the gating system and the mold cavity, and the moving and fixed modes are separated to remove the plastic products. In order to reduce the heavy work of mould design and manufacture, most of the injection mould has adopted the standard mold frame.