Cracks; Cracks on blow molding parts are often found near the melt line. The real situation in the field of Extrusion blowing machine is analyzed.
The key to affect the overall shape of extrusion blow molding mold is that the drawing ratio of the high pressure cylinder is consistent with the wall thickness uniformity of the product, and the principle is the structure of the runner and blow molding mold.
● The cost of Blowing machines (especially blow molding molds) is low (when molding similar products, the cost of Blowing machines is about 1/3 – 1/2 of that of injection machines), and the production cost of products is also low.
● The relative molecular weight of blow molding grade plastics (such as PE) is much higher than that of injection grade plastics. Therefore, blow molded products have high impact toughness and high resistance to environmental stress cracking, and are suitable for producing containers or barrels for packaging or transporting detergents and chemical reagents.
● Because the blow molding mold is only composed of female mold, the wall thickness of the product can be changed by simply adjusting the die gap or extrusion conditions of the head, which is very beneficial to the products that cannot accurately calculate the required wall thickness in advance. The cost of injection molding without changing the wall thickness of products is much higher.
● Blow molding can produce products with small wall thickness, which cannot be produced by injection molding.
● Blow molding can produce products with complex, irregular and integral shapes. When injection molding is adopted, after two or more products are produced, they are combined by buckle fitting, solvent bonding or ultrasonic welding.
Plastic bottles are usually composed of injection system, mold closing system, hydraulic transmission system, control system, lubrication system, heating and cooling system, safety monitoring system, etc. During injection molding, first use the gas to open the system for injection, and then use the skilled manipulator to take out the products. According to the injection operation requirements, inject all plastic bottles into the gas of a certain size, and then start from the mold of a certain size to cut and blow, to achieve the consumption accuracy and high-speed industrialization. Ordinary plastic bottles are more practical for alcohol bottles because they are used to make various plastic bottles or other plastic bottles. Generally, three-in-one plastic bottles can be used to achieve hot filling. Although the series of equipment is more general, their prices are often higher.
● Before starting each shift, lubricating oil must be added to each moving part once. (Manipulator, manipulator guide rail, mold opening and closing guide rail.
● The swing arm can be added once every (3-4) days. The large chain and small chain of the heater can be used once a month. Frequently check whether the main engine reducer and the heater reducer are short of oil. The main bearing can be added once every three months.
● Before production, check whether the moving parts are firm, whether the screws are loose and fall off, especially in places with strong impact force, and whether the belt drive part is abnormal.
● Check whether the embryo feeding and embryo dropping parts of the heating head work normally. If the insert is not in place, the nut of the press device can be adjusted.
● When the solenoid valve of the automatic bottle blowing machine is abnormal, it should be cleaned in time (once every 3.5 million bottles).
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