PC의 성능이 뛰어남, 높은 투명성, 좋은 충격 인성, 크리프 저항, 광범위한 온도. PC의 공정 특성은: 전단 속도에 대한 용융 점도의 민감도가 작습니다., 그러나 온도에 대한 민감도가 매우 높습니다., 뚜렷한 녹는점이 없음, high viscosity of melt, 고온에서 수지의 가수분해가 용이하고 제품의 균열이 용이함. In view of these characteristics, 우리는 다른 치료에 특별한주의를 기울여야합니다: 용융물의 유동성을 증가시키기 위해, we should not increase the injection pressure but also adopt the method of increasing the injection temperature. The runner and gate of the mould are required to be short and thick to reduce the pressure loss of the fluid and to have a higher injection pressure. Before forming and processing, the resin should be dried sufficiently to keep its moisture content below 0.02%. 게다가, heat preservation measures should be taken to prevent moisture absorption during the process. Not only the reasonable product design is needed, but also the molding process should be correctly mastered, such as increasing the mold temperature and post-treatment of the products, 기타. can reduce or eliminate the internal stress. Adjust the process parameters according to the different conditions of the product.
Here is the forming process
1. Injection temperature must be integrated with the shape, size and mold structure of the product. The performance and requirements of the products can only be made after considering the conditions. 일반적으로, the temperature of the molding is between 270-320 ℃, if the material temperature is higher than 340 ℃, PC will decompose, the product color will become darker, and the surface will show defects such as silver wire, dark strip, black spot and bubble, and the physical and mechanical properties also decrease significantly.
2. Injection pressure has a certain influence on the physical and mechanical properties, internal stress and molding shrinkage of PC products, which has a great influence on the appearance and demoulding performance of the products. Low or too high injection pressure will cause some defects of the products. 일반적으로, the injection pressure is controlled between 80-120MPa, and for products with thin wall, long process, complex shape and small gate, In order to overcome the resistance of melt flow and fill the cavity in time, the higher injection pressure (120-145안전 캡 쉘) is selected. 따라서, the products with complete and smooth surface are obtained.
3. The pressure maintaining pressure, the pressure holding time and the length of the holding time have a great influence on the internal stress of PC products. The pressure maintaining pressure is too small, and the small shrinkage effect is easy to appear vacuum bubble or concave surface, too much pressure retaining pressure, and the large internal stress is easily produced around the gate. In the actual processing, the method of high material temperature and low pressure keeping is often used to solve. The selection of pressure holding time should be determined by the thickness of the product, the size of the gate and the mold temperature. 일반적으로, the small and thin products do not need a long holding time. 반대로, the pressure holding time of the large and thick products should be longer. The length of pressure holding time can be determined by the test of gate sealing time.
4. The injection speed has no obvious influence on the performance of PC products. Except for thin-walled, small gate, deep hole and long process products, medium speed or slow processing is generally adopted, preferably multi-stage injection, and the slow fast slow multi-stage injection method is generally adopted.
5. The mold temperature can be controlled at 80-100 ℃, and the shape of the products with complex shape, thin and high requirements can also be increased to 100-120 ℃, but it can not exceed the hot deformation temperature of the mold.
6. Screw speed and back pressure are characterized by high viscosity of PC melt, which can be beneficial to plasticizing, exhaust and maintenance of plastic machine, to prevent screw overload. The speed requirement of screw should not be too high. 일반적으로, it is appropriate to control the screw speed at 30-60r/min, while the back pressure should be controlled between 10-15% 사출압력.
7. PC should strictly control the use of mold release agent in the process of injection molding, and the use of recycled materials should not exceed three times, and the usage should be about 20%. Requirements for the molding machine for PC products: the maximum injection volume (including runner, 문, 등.) of the products shall not be greater than 70-80% of the nominal injection quantity. The screw shall be of single head thread equal pitch and gradient compression screw with check ring. The length diameter ratio of screw l/d is 15-20, and the geometric compression ratio c/r is 2-3.
JasonMould Industrial Company Limited 정보
Jasonmould는 중국 금형 제작자 플라스틱 금형- 사출 금형, 다이 캐스팅 금형, 플라스틱 블로우 성형, 회전 성형, 의료 플라스틱 사출 성형, 투샷 플라스틱 사출 성형, 인서트 몰딩, 오버 몰딩, 금속 사출 성형, 마이크로 사출 성형, 분말 사출 성형, 세라믹 사출 성형, 액체 사출 성형, 허스키 사출 성형, 가정용 곰팡이, 주조 금형, 금형 도구 다이, 맞춤 금형, 중국 금형, 신속한 프로토 타이핑 도구, 플라스틱 프로토 타이핑 툴링, 펀치 프레스 툴링, 모바일 / 휴대폰 부품 용 다이 및 툴링, 자동차 부품, 진공 청소기, 충전식 도구, 전화기, 복사기, 컴퓨터, 멀티미디어 스피커, 및 기타 많은 전자 제품 및 가전 제품. 또한 플라스틱 제품 제조업체, 금형 제조업체 중국– 플라스틱 부품, 플라스틱 물 탱크, 플라스틱 공, 플라스틱 용기, 플라스틱 버클, 플라스틱 앵커, 플라스틱 걸이, 플라스틱 숟가락, 플라스틱 파이프 피팅, 플라스틱 텀블, 플라스틱 식기, 플라스틱 컵들, 플라스틱 병, 플라스틱 쟁반, 플라스틱 화장품 용기, 플라스틱 케이스, 플라스틱 식품 용기, 플라스틱 의자, 플라스틱 캡, 플라스틱 캡 폐쇄, 플라스틱 튜브, 플라스틱 수도관, 플라스틱 손잡이, 플라스틱 튜브, 플라스틱 유틸리티 박스, 플라스틱 선반 등.
접촉:
사람: 제임스 위안
회사: JasonMould 산업 회사 제한
더하다: 롱강 빌리지,LongXi 타운,BoLuo 카운티,혜주시,광동성, 중국
Tel: 86-752-6682869
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