The rheology of biobased white knife in molten state is better, and the influence of pressure on viscosity is greater than that of temperature, so the activity of melt is mainly changed from pressure. Plastic bottles have different states of use in different environments, so the rheology and viscosity are effectively controlled in the molten state of the plastic bottle. Next, let's take a look at the production process of biobased white knife.

1, plastic treatment

Because biobased white knife macromolecules contain lipid groups, with a certain hydrophilicity, the particles are more sensitive to water at high temperatures, when the water content exceeds the limit, the molecular weight of biobased white knife decreases in processing, and the products are colored and brittle. Therefore, the material must be dried before processing, and the drying temperature is 150 ° C for more than 4 hours, generally 170 ° C for 3-4 hours. The material can be checked by air fire to see if it is completely dry. When using materials, the raw materials should be dried to a certain extent, and different drying temperatures and time limits should be paid attention to to ensure that the plastic bottles produced have good product function.

2, injection molding machine selection

biobased white knife Because of the short time after the melting point is not chaotic, and the melting point is high, so the injection system with more temperature control sections and less self-friction heat generation during plasticization should be selected, and the actual weight of the product (water mouth material) can not be less than 2/3 of the machine injection amount.

3. Retention time

Do not use too long retention time to prevent molecular weight drop. Try to avoid temperatures above 300 ° C. If the shutdown is less than 15 minutes. Only air fire processing is required; If it is more than 15 minutes, it is necessary to clean with viscosity pe, and reduce the barrel temperature to pe temperature until it is turned on again. In the detention time of plastic bottles should be strictly controlled, different temperatures need to be treated differently, and the time limit should be strictly grasped.

4. Pay attention

The recycled material can not be too large, otherwise it is easy to produce the "bridge" at the bottom of the material and affect the plasticization, in the recycling of plastics, strictly control the number of recycled materials to ensure the plasticization quality of plastics. If the mold temperature control is not good or the material temperature control is improper, it is easy to produce "white fog" and opaque. It is necessary to strictly control the mold temperature, otherwise there will be events that you do not want to see, the mold temperature is low and average, the cooling speed is fast, and the product is transparent with less crystallization.

5. Mold and gate design

biobased white knife embryo is generally molded with hot runner mold, and it is best to have a heat shield between the mold and the injection molding machine template, the thickness of which is about 12mm, and the heat shield must be able to withstand high pressure. The exhaust must be sufficient to avoid local overheating or fragmentation, but the depth of the exhaust port is generally not more than 0.03mm, otherwise it will easily produce a flash. The production process of biobased white knife requires strict quality system maintenance to ensure that the plastic bottles produced have good product quality and assurance. The production process is complex and requires strict control of different production processes to ensure that each process is carried out in strict accordance with the scale.

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