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Raw Material Preparation: First, PETG resin needs to be prepared as the raw material. PETG resin is generally supplied in granular or flake form. According to the requirements of the PET bottle, an appropriate amount of pigments and other additives can be added. These bottles can later be equipped with components like a lotion pump or a foamer pump depending on the final product design.
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Pre-treatment: PETG resin needs to undergo drying treatment before blow molding to remove moisture. Under normal circumstances, the resin is placed in a dryer for preheating and drying treatment to ensure that the humidity of the resin is lower than 0.05%.
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Extrusion: The dried PETG resin is added to the hopper of the injection machine, and through screw heating and pressure conversion, the resin is melted to form plastic in a molten state. Then, it is extruded through the nozzle of the extruder to shape and form a long plastic tube.
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Blow Molding: In the mold of the blow molding machine, the plastic tube extruded from the extruder is placed into the cavity of the mold. Then, high-pressure gas (usually compressed air) is injected into the mold to blow and expand the plastic tube into the shape of the mold. At the same time, the cooling system in the mold will rapidly reduce the temperature of the plastic, causing it to solidify quickly.
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Cooling and Demolding: During the blow molding process, the temperature of the plastic is rapidly reduced by means of cooling water through the cooling system in the mold, causing it to solidify. Once the plastic solidifies, the mold can be opened, and the blown PETG bottle can be taken out.
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Finishing and Packaging: The taken-out PETG bottles undergo finishing to remove possible residues and are inspected. Then, they are packaged according to product requirements, using cardboard boxes, plastic bags, or other suitable packaging materials.
Summary: The PETG bottle blowing production process includes steps such as raw material preparation, pre-treatment, extrusion, blow molding, cooling and demolding, and finishing and packaging. Through these steps, high-quality and highly transparent PETG blow-molded bottles can be produced.