PET preform is a typical plastic injection processing product, easy to transport, mostly made of plastic, with good insulation, is the intermediate product of plastic bottles and oil drums.
At a certain temperature and pressure, the preform with a certain thickness and height is processed by filling raw materials in the mold and processing by the injection molding machine.
2.Introduction to PET material
Polyethylene terephthalate is the main varieties of thermoplastic polyester, English named Polythylene terephthalate PET or PETP (or PET), commonly known as polyester resin. It is a condensation of terephthalic acid and ethylene glycol, together with PBT collectively known as thermoplastic polyester, or saturated polyester. PET is a milky or pre-yellow highly crystalline polymer with a smooth and shiny surface. Good creep resistance, fatigue resistance, friction resistance and dimensional stability, small wear and high hardness, with the greatest toughness in thermoplastics; Electrical insulation performance is good, less affected by temperature, but poor corona resistance. Non - toxic, climate - resistant, anti - chemical stability, low water absorption, weak acid and organic solvents.
3.Equipment required for processing
Injection molding machine, mold, grinder, mixer, production workshop, air pump.
4.PET bottle compression test
PET bottles are often used for packaging, which is often stacked in layers during transportation or storage. That's when we think about the bottom rung
Ability to work under pressure. In the process of PET bottle compression test, put the PET bottle into the machine with two horizontal pressure plates and start the PET bottle compression machine of suzhou eurometer. The two pressure plates will be pressurized at a certain test speed. The instrument will automatically stop and save the data when it is added.
Routine testing of PET bottles includes wall thickness testing, compressive resistance testing and cap opening fatigue testing. PET manufacturers have their own quality testing departments.
5.PET bottle cap classification
Use (general manufacturing materials in brackets) : aseptic cold filling cover (PE), hot filling cover (PE), normal temperature no internal pressure (water) cover (PE) and steam cover (PP)；
The structure is divided into plug type and gasket type, and the sealing pad is drip plastic cover.
The processing technology can be divided into injection molding and compression molding.
From the material division HDPE and PP.
The parting from the connecting bridge is finished by injection molding and finished by trimming.
From the size of 28 teeth, 30 teeth, 38 teeth, 44 teeth, 48 teeth.
From the use of non - steam lid, carbonated beverage lid, sterile lid, heat - resistant lid.
From tooth line cent 12 multiple or 9 multiple.
8 and 12 points are deducted from the anti-theft ring lock.
PET bottle has a strong application, widely used in daily necessities, daily chemical packaging and other fields. From the mold processing to the machine equipment has a strong picky, easy to get started, difficult to do fine. PET preforms plastic bottles through blow molding, including cosmetics, medicine, health care, beverages, mineral water, reagent and other packaging bottles. This method of bottle making is called two-step method, that is, through injection molding to form preforms, and then through blow molding to form PET plastic bottles.