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Contacts:Elena
Phone:+86-769-88029572
Skype:china.elena22
E-mail:china_elena@163.com
Address:No. 138, First Sutong Road, Dajingjiu Plastic Market, Changping Town, Dongguan City, Guangdong Province, China

PC / ABS product, silver and solutions


PC / ABS product, silver and solutions
PC / ABS product, silver and solutions
1. Machine aspects:
(1) barrel and screw wear or plastic head, over apron presence of dead streams, prolonged exposure to heat and decomposition.
(2) heating system out of control, causing the decomposition temperature is too high, you should check whether the heating element thermocouple, heaters and other problems. Improper screw design, resulting in a solution or easily into the air.
2. molds:
(1) Exhaust bad.
(2) mold flow channel, runner, cavity friction resistance, resulting in local overheating and decomposition occurs.
(3) gates, the uneven distribution of the cavity, the cooling system will result in unreasonable heat imbalance local overheating or block the air passage.
(4) cooling passage leaking into the cavity.
3. Plastic aspects:
(1) Plastic humidity
(2) to absorb moisture from the atmosphere or from a coloring agent to absorb moisture, but also to deal with the colorant is dried, preferably in the machine table loading dryer.
(3) add plastic lubricants, stabilizers, etc. The amount of excess or uneven mixing, or plastic itself with volatile solvents. There will be the degree of thermal decomposition when mixed plastic difficult to balance.
4. Processing:
(1) to set the temperature, pressure, speed, back pressure, melt caused by excessive motor speed decomposition, or pressure, speed is too low, injection time, holding pressure is not sufficient, when the back pressure is too low, due to the failure to obtain a high pressure and density insufficient melting gas occurrence of silver streaks, should set the appropriate temperature, pressure, speed and time and the use of multi-stage injection speed.
(2) back down, but the speed of disintegration quick and easy air into the cylinder, with the melt into the mold, the cycle is too long when the heat melting the material in the barrel too long.
(3) insufficient quantity, feeding cushion is too large, the material temperature is too low or too low mold temperature affect the flow of material and molding pressure, prompting the formation of bubbles.
2. Recommends
1. drying material temperature of 110 degrees for 4 hours and the actual injection pressure by product regulation. Such as iron sheet is not serious phenomenon is a normal phenomenon, it will go through the metal mesh due to molding pellet production process.
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