Screw of injection moulding machine has the functions of conveying, melting, mixing, compressing, measuring and exhausting, which is the key factor affecting the plasticizing quality. Here are the main points of screw selection in injection moulding of several commonly used plastics.PolyamideThe characteristics of PA are as follows: crystalline plastics have many kinds, different kinds, different melting points, and narrow melting point range. The melting point of PA66 is 260~265 degrees C. Low viscosity, good fluidity, obvious melting point, poor thermal stability. Water absorption is general.ABSThe characteristics of ABS are as follows: good comprehensive performance, high impact strength, chemical stability and good electrical performance; good fusion with 372 plexiglass, made into two-color plastic parts, and can be chromium plated on the surface, spray paint treatment; high impact resistance, high heat resistance, flame retardant, enhanced, transparent grade; poor mobility than HIPS, better than PMMA, PC, good flexibility.PPPP has the following characteristics: odorless and non-toxic. Because of its regular structure and high crystallization, the melting point can be as high as 167 C. Heat-resistant, corrosion-resistant, products can be steam disinfection is its outstanding advantages. Low density, is the lightest general purpose plastic. The disadvantage is poor low temperature impact resistance and easy aging, but can be overcome by modification respectively.polycarbonateThe characteristics of PC are as follows: amorphous plastics without obvious melting point, glass transition temperature 140-150 C, melting temperature 215-225 C and forming temperature 250-320 C. Viscosity is high and sensitive to temperature. It has good thermal stability in the normal processing temperature range. It does not decompose for a long time at 300 C, and begins to decompose at more than 340 C. Viscosity is less affected by shear rate. Water absorption is strong.                                

"A recent report says that consumer pressure on businesses and producers, regulatory regulations such as the ban on plastic bags, and increased environmental initiatives related to global warming will boost demand for biodegradable plastics.Demand in North America, Europe and Asia was only 269,000 tons in 2012 and will increase to nearly 525,000 tons by 2017, with an average annual growth rate of nearly 15%.Food packaging and catering services will boost demand for biodegradable polymers, with double-digit growth in North America and Europe, Houston-based HIS Chemical said. In terms of demand, the demand for foam packaging and compostable plastic bags will rank first.Michael Malveda, chief analyst of specialty chemicals at HIS Chemicals and lead author of the report, said: "The biodegradable polymer market is still in its infancy and on a small scale, but its expected demand growth and demand potential for the next few years are astonishing. "Food packaging, dishes and tableware are the main markets for such materials, because they can be composted with food without sorting, which is of great benefit to waste management and can also reduce food waste and composting for packaging. With the increasingly stringent regulations and increasing pressure from consumers, retailers and manufacturers are also encouraged to switch to these biodegradable products and materials. "In 2012, Europe accounted for about 55% of global demand for biodegradable polymers, followed by North America for 29% and Asia for 16%."Price and performance are the main barriers to biodegradable polymers, but improvements in processing technology, expansion of applications and increased production will significantly overcome these barriers," Malveda said. Many countries have implemented relevant regulations, such as the ban on plastic bags, which has prompted new research on alternative materials and new uses. "He said demand for biodegradable polymers in Asia was hampered by higher raw material prices.Polylactic acid currently accounts for about 47% of global demand for biodegradable plastics, followed by starch-based plastics at 41%, the report said. "

A Successful Case of H180-32 Model Test Developed by the Company in 2018