A detailed description of the processing methods of plastic products?
Plastic: the material used in this process is usually pulverized into powder, which is melted and flowed in the heat cycle. The use of two types of PE: general rotational and cross linkable class. General purpose MDPE/HDPE typically ranges from 0.935 to 0.945g/CC, with a narrow MWD, high impact and minimal warpage, and a melt index range of 3 - 8. The higher MI grades are usually not applicable, because they do not have the impact of plastic products of hope and resistance to environmental stress cracking.The unique properties of high performance rotational application system using its chemical crosslinking grade. These grades are liquid in the first part of the molding cycle and are then crosslinked to form a superior resistance to environmental stress cracking and toughness. Wear resistance and climate resistance. Crosslinkable PE is uniquely suited for large containers, ranging from 500-gal transportation of chemicals from storage tanks to 20000-gal agricultural storage tanks.
Injection molding: HDPE has countless applications, ranging from reusable thin-walled beverage cups to 5-gsl cans, consuming domestically produced HDPE 1/5. Injection grade general melt index of 5~10, with a low toughness, liquidity grade and processability of the higher flow level. Uses include daily necessities and food thin walled packages, rugged and durable food and paint cans, and high environmental stress cracking applications such as small engines, fuel tanks, and 90-gal waste cans.
Blow molding: sold in the United States HDPE, above 1/3 for blow molding purposes. These range from bottles of bleach, oil, detergents, milk and distilled water to large refrigerators, car fuel tanks, and cans. The grades of blow molding such as melt strength, ES-CR and toughness are similar to those used for sheet and thermoforming applications, so similar grades can be used.
Extrusion: for extrusion production grade generally has less than 1 of the melt index and wide width to MWD. Low melt strength of MI can be obtained during processing. Wider MWD grades are more suitable for extrusion because they have higher production speed, lower die pressure, and less melt fracture tendency.
Film: PE film processing, general blown film processing or flat extrusion method. Most PE are used in thin films, and general purpose low density PE (LDPE) or linear low density PE (LLDPE) are available. HDPE film grades are generally used where superior tensile properties and excellent impermeability are required. For example, HDPE films are commonly used in commodity bags, grocery bags, and food packaging.
