Request pdf waterassisted injection molding of thermoplastic materials. High injection veloci ties and pressures are undesirable, because they cause melt fracture and part fracture. Gas assist injection molding is a process enhancement to conventional injection molding, involving the injection of highpressure nitrogen gas into the melt stream immediately after the injection of the resin. The gas assist injection molding process enables the molder to design a part that will require, in most cases, lower clamp tonnages. Fluidassisted injection molding is an emerging process that includes gasassisted injection molding gaim and waterassisted injection molding waim 4, 5. Fluid assisted injection molding technology working for you. Waterassisted injection molding has been deployed for the first time in japan to manufacture water pipes in an automotive application.
For the love of physics walter lewin may 16, 2011 duration. When your project requires a specific engineered material, it becomes either a lowvolume injection molding or. Schematic of thermoplastic injection molding machine. Water assist injection molding development basf corporation. The refined process of waterassisted injection molding offers more options than gasassisted molding insofar as what it allows in part production.
Gasassisted injection molding 1 gasassisted injection molding is a process where an inert gas is introduced at pressure, into the polymer melt stream at the end of the polymer injection phase. External gas injection technology gasassisted injection molding. The injection machine is constructed of a mold clamping device that opens and closes the mold tool, and. A statistical experimental study on shrinkage of injection. Rajalingam1, awang bono2 and jumat bin sulaiman3 abstract plastic injection molding is an important process to produce plastic parts. Basfs engineering plastics group has invested in water assist injection molding waim development capabilities in europe and north america, with active application development projects in both regions water assist injection molding is a hot topic within the plastics industry because of the ability to mold hollow or partly hollow parts. The intent is not to cause mixture of the nitrogen and resin, but for the nitrogen to displace resin in flow. Injection molding to the material we have on hand at the time your quote is created. Gasassisted injection molding concept products and versions covered. Lexus adopts waterassisted injectionmolded water pipes. In waterassisted injection molding, according to whether the molten polymer is fully filled with the main cavity before highpressure water injection, it can be divided into shortshot water. Your quote worksheet will present you with the currently available materials.
Simulation of gasassisted injection moulding materials technology. Waterassisted injection molding of thermoplastic materials. Suppliers and manufacturer of gas assisted injection molding machine, consultants for gas assisted injection moulding process and gas assisted injection molding equipment. Gas assisted injection molding is not recommended by any means for all injection molded products. Water assisted injection moulding waim is a new development in the field of injection moulding and said to be an alternative to gas assisted injection moulding gaim. Waterassisted injection molding is the newest way to mold hollow or partly hollow parts. I need some assistance to convert my conventional injection molding machine to gas assisted injection molding. The water, used as a cheap packing material, brings short.
Developed from the same ideas as gasassisted injection molding, this special molding process provides thick molded plastics with excellent mechanical strength and dimensional stability, manufacturing highquality parts with fewer materials. Its basically similar to gasassist molding as a means to core out thick sections. Using stateoftheart 3d animations, participants get a. Water injection through machine nozzle is not possible. Limitless coining p p 1 p 2 p 1 p 2 holding pressure holding pressure p p 1 p 2 p 1 p 2 coining pressure fig. There are many reference data tables regarding plastics data, statistical methods, engineering calculations. Study on waterassisted injection molding technology iconline. Toyotaaffiliated tier 1 toyoda gosei kiyosu, japan is utilizing the technology to mold the coolant pipes for the intercooler of the turbocharger engine in the lexus nx, which was released in july 2014. Injection molding, standard parts, defects, water assisted.
Why water assisted injection moulding fuel injection nozzle. This idea of injection of fluids water or oil was proposed in 70s. Water assisted injection moulding machine aquamold youtube. The process of water assisted injection moulding was developed at the. Us6896844b2 process for gas assisted and water assisted. Using this process, tubular hollow parts and rod shaped products can be manufactured cost effectively.
With fluid injection, it is possible to manufacture molded parts offering vital advantages. Molten plastic is injected at high pressure into a mold, which is the inverse of the products shape. Waterassisted injection molding team, add waterassisted injection molding simulation capabilities in moldflow. Ejector plate travel shall be sufficient for full part ejection and consistent molding cycle operation.
The focus of this study consists of a strong study and understanding of waterassisted injection molding waim process, to aid in the design of a new processsystem to help this technology to allow the production of hollow and bifurcated multiple channels parts within a single injection cycle. Assisted injection moulding aim is part of a family of technologies that are operated with plastics processing methods to improve product quality and significantly reduce cost. Waterassisted injection molding autodesk community. When clamp tonnage is reduced, a smaller machine may be utilized for making the product as compared to conventional injection molding. Injection molding fundamentals is a new two lesson 34 hour training program that teaches your personnel the most important and fundamental aspects of the injection molding production. Gas assisted injection molding, gas assist injection. Course introduction gasassisted injection molding process was developed in 1970s for improvement in surface quality of product and reduction of product warpage, cycle. A preselected amount of resin is injected into the mold, followed by nitrogen, which fills the cavity from inside the resin, leaving a designed void in the middle of the. The injection molding machine consists of the injection unit and the clamping unit, and their features are described below.
The gas pressure regulation is applied individually with pressurecontrol modules at every injection molding machine. However, the difficulty in determining optimum process parameters setting may cause defects of the injected molded parts such as shrinkage. Gas assist processing is also not intended to be only a fix for problematic programs. After a product is designed, usually by an industrial designer or an engineer.
Water injection molding makes hollow parts faster, lighter. Effects of processing parameters the objective of this study was to experimentally. Assisted injection moulding products maximator gmbh. Design and manufacturing of plastic injection mould. Bauer compressors onsite nitrogen generation for gas. This information is most useful by personnel who work in the injection molding field including press operators, technicians, engineers, designers, mold builders, etc. The boundary condition of 1st kind applies to injection molding since the. The technologies include the injection of gas or water at high pressure into plastic in an injection mould. A liquid and gas assisted injection molding apparatus comprising a source of liquid coolant, a source of compressed gas, a source of heated viscous plastic, a mold cavity means for controllably injecting said plastic into said cavity, means for controllably injecting said compressed gas into said cavity, means for controllably injecting said liquid coolant into said cavity, and means for.
Welcome to the premier industrial source for gas assisted injection molding. Water is a chemical compound with the chemical formula h 2o. Water assisted injection molding service universal. Gasassisted injection molding concept moldflow flex. Projected shot area is defined as the area of parts and runners that is.
Effects and optimization of processing parameters in water. Gas assist injection molding helps eliminate the quality issues inherent to conventional injection molding, because nitrogen is used to push the resin to the ends of the mold. It is recommended to keep injection pressures less than bars 15,000 psi and pack pressures less than 700 bars 10,000 psi. The gas injection displaces the molten polymer core ahead of the gas, into the as yet.
Hardware sizes component press size up to 150 tons 250 tons 500 tons 500 tons locator ring 4 4 nozzle radius 12 12 water fittings 1419 nptf or 3818 nptf. Water is a liquid at standard ambient temperature and pressure, but it often coexists on earth with its solid state, ice, and gaseous state, steam water vapor. High injection pressures may dictate the higher clamping recommendation. The companies featured in the following listing offer a comprehensive range of gas assisted injection molding, as well as a variety of related products and services. Gasassisted injection molding is a process where an inert gas is introduced at pressure, into the polymer melt stream at the end of the polymer injection. But waterinjection technology wit comes with a big advantage. Water assisted injection molding for single and multi. Pellets in the hopper passed through heated barrel. In the ikv process, cold water is injected into the melt and. This reference guide was originally prepared in 1990 as a convenient pocket sized resource for use in injection molding.635 229 204 408 1004 1545 968 43 177 350 1010 1297 368 1093 623 111 1277 1606 78 124 1374 1360 373 174 773 549 638 633 771 1539 198 778 254 168 1086 187 909 1059 79 966 50 974 740 661 1012 547 340 551