Water and gas/water assisted injection molding of polymers

Abstract

Wtryskiwanie tworzyw polimerowych wspomagane wod¹ oraz uk³adem gaz + wodaStreszczenie -Dokonano przegl¹du literatury dotycz¹cej niekonwencjonalnych metod wtryskiwania tworzyw polimerowych wspomaganego wod¹ b¹dŸ gazem i wod¹. Metody te pozwalaj¹ na wytwarzanie wyprasek o w³aoeciwooeciach i cechach powierzchni trudnych lub niemo¿liwych do uzyskania w niekonwencjonalnym procesie wtryskiwania wspomaganego gazem. Omówiono je szczegó³owo z podaniem schematów procesów przetwarzania a tak¿e z podkreoeleniem ich wad i zalet oraz cech szczególnych. Przedstawiono mo¿liwooeae zastosowania wspomnianych metod do produkcji ró¿norakich przedmiotów s³u¿¹cych w wielu dziedzinach gospodarki. S³owa kluczowe: wtryskiwanie niekonwencjonalne, wspomaganie gazem, wspomaganie wod¹, wspomaganie gazem i wod¹, powierzchnia wyprasek, zastosowanie wyrobów. WATER AND GAS/WATER ASSISTED INJECTION MOLDING OF POLYMERSSummary -The literature review concerning unconventional methods of injection molding of the polymers, assisted with water or gas and water, has been done. The methods discussed let produce the parts showing surface properties and features difficult or impossible to reach in the unconventional gas assisted injection molding process. The methods were discussed in detail, with schemes of the processes given ( Fig. 1-3) and with their advantages and disadvantages as well as specific features marked. The possibility to use these techniques in the production of various goods, applied in many economy branches, has been presented ( Fig. 4).

Overview of the Experimental Trends in Water‐Assisted Injection Molding

“…Simulation is a useful tool for the mathematical modeling in polymer crystallization and processing . Due to the complexity of the WAIM process, computer simulation is expected to become an important and required tool to help understanding this process, especially tracing two moving interfaces which are the water–melt interface and melt–front interface. However, there are few reports on modeling and simulation of WAIM.…”

Selected problems of precision injection molding. Part II. Factors influencing the quality of precise moldings

“…Inn¹ metod¹ wtryskiwania stosowan¹ do wytwarzania wyprasek precyzyjnych jest wtryskiwanie wspomagane gazem lub wod¹, nazywane te¿ wtryskiwaniem pustosz¹cym [9]. W procesach tych do gniazda formuj¹cego formy wtryskowej, czêoeciowo lub prawie ca³kowicie wype³nionego tworzywem ciek³ym, wprowadza siê gaz (najczêoeciej dwutlenek wêgla) lub wodê pod du¿ym cioenieniem, umo¿liwiaj¹cym przemieszczenie tworzywa w kierunku oecianek formy [5,29,30]. Bezpooerednio przed otwarciem formy i wyjêciem z niej wypraski, gaz lub woda zostaje usuniête z gniazda.…”

Research on the Key Technologies for New Large Dual-Platen High-Precision Clamping System

“…In the traditional view, the precision injection molding is usually designed for small plastic parts and many experts have carried out some researches on the micro-injection molding [3][4]. However, the large-scale parts` precision is required higher and higher [5].It is a trend that studies and manufactures large injection machine with high-precision. Researchers have done some progress on the aspects of molding process and molding technology [6][7][8].However, there is still lacking of research on the clamp mechanism itself.…”