In our daily life, we have been exposed to a variety of
plastic products , some are colorful, some are colorless and transparent. Let's take a look at the magical magic that makes plastic products transparent. Process characteristics of transparent plastics: In addition to the common problems in the injection molding process of plastic products, transparent plastics also have some process characteristics, which are described as follows:
1. Process characteristics of PMMA
PMMA has high viscosity and poor fluidity. Therefore, it must be filled with high material temperature and high injection pressure. The injection temperature is greater than the injection pressure, but the injection pressure is increased, which is beneficial to improve the shrinkage rate of the product. The injection temperature range is wide, the melting temperature is 160 ° C, and the decomposition temperature is 270 ° C, so the material temperature adjustment range is wide and the processability is good. Therefore, improving fluidity can be started from the injection temperature. Poor impact, poor wear resistance, easy to scratch, easy to brittle, it should improve the mold temperature, improve the condensation process, to overcome these defects.
2, PC process characteristics
PC has high viscosity, high melt temperature and poor fluidity. Therefore, it must be injection molded at a higher temperature (between 270 and 320 °C). Relatively speaking, the temperature adjustment range is narrower and the processability is not as good as PMMA. The injection pressure has little effect on the fluidity, but due to the large viscosity, the injection pressure is still large, and the pressure holding time should be as short as possible in order to prevent the internal stress. The shrinkage rate is large and the size is stable, but the internal stress of the product is large and easy to crack. Therefore, it is better to increase the temperature instead of the pressure to improve the fluidity, and to improve the mold temperature and improve the mold structure and post-treatment to reduce the possibility of cracking. When the injection speed is low, the gate is prone to ripples and other defects, the temperature of the nozzle is controlled separately, the mold temperature is high, and the runner and gate resistance are small.
3, PET process characteristics
PET molding temperature is high, and the material temperature adjustment range is narrow (260-300 ° C), but after melting, the fluidity is good, so the processability is poor, and the anti-ducting device is often added in the nozzle. Mechanical strength and performance are not high after injection, and performance must be improved by stretching and modification. The mold temperature is accurately controlled to prevent warpage. An important factor in deformation is therefore recommended for hot runner molds. The mold temperature should be high, otherwise it will cause poor surface gloss and difficulty in demolding.
1.Quality pass Germany TUV testing. Tuv testing is third safety certificate company,.more authoritative.
2. This system welding machine use Surface Mount System to install electron component and the main PCB board is single .So this system could make the machine`s quality is very stable. Rise the quality consistency.
.
3.The power tube of the switch use germany infineon only.The PCB board thickness size is 2.7mm.
4.The insert component use Taiwan KSS.
5.The aluminum web wing is more bigger and weighter than normal.
6.Passed EMC certificate and get the EMC certificate. According to IEC 60974-1 standard.
7. Our machine`s input voltage is auto change between 85V-240V.So could work under any voltage. Like japan 110V or America 110V AC. Like European 220V-240V AC. Like Brazilian 110V/220V together AC.
8.CEL. Could weld Cellulose electrode easy.
9. Welcome any customer to make your design. We have advanced exploit troop.
10.PFC (Power Factor Correction is more than 98%. So according to energy conversation ,environmental protection and low-carbon.
11. VRD make no-load output voltage under 24±2V, But when arc strike twinkling could rise working output voltage.So this technique could have more physical protection.
Welding Tools
industrial Welding Machine,Pigeon Welding Machine,Family Quality Welding Machine
YongKang WALMA Tools CO., LTD. , http://www.walmatools.com
