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What are the differences between an open loop and closed loop injection molding machine?
The difference between open loop and closed loop injection moulding is to do with the type of control system used. An open loop system changes the input signal relative to the pre-defined perameters of the system. A closed loop system uses a feedback signal ie it takes information from a point in the process usually the end and sends it back to the start where the system adjusts the input accordingly. To fully understand this I would suggest getting a good book on control theory. I use 'Modern Control Engineering' by Katsuhiko Ogata. Many people also use Richard Dorf but I find Ogata easier to follow. AuthorOgata, Katsuhiko.TitleModern control engineering / Katsuhiko Ogata.
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What is core and cavity?
The core and cavity are the machined metal parts used in Tool/Mold for Injection Molding Machine or Pressure Die Casting processes. These two parts are designed with reference to the shape of the product. They ensures proper cavity space same like product shape once assembled together. The molten material at certain viscosity will be poured inside & cooled to form the shape of the product once taken out.
What does the term renovation hardware refer to?
Renovation hardware is referring to the fixtures used for home renovations. Renovation hardware can include knobs, molding, trim, cabinets, lighting, and flooring.
What is masterbatches?
Masterbatch (MB) is a solid or liquid additive for plastic used for coloring plastics (color masterbatch) or imparting other properties to plastics (additive masterbatch). Masterbatch is a concentrated mixture of pigments and/or additives encapsulated during a heat process into a carrier resin which is then cooled and cut into a granular shape. Masterbatch allows the processor to colour raw polymer economically during the plastics manufacturing process. The alternatives to using masterbatches are buying a fully compounded material (which may be more expensive and less open to e.g. color variability of the product), or compounding from raw materials on site (which is prone to issues with achieving full dispersion of the colorants and additives, and prone to preparing more material than what is used for the production run). In comparison with pure pigments, masterbatches require more storage space and their lead times are longer. Another disadvantage is additional exposure of heat ("heat history") to both the carrier and the additive; this may be important e.g. for marginally thermally stable pigments.[1] As masterbatches are already premixed compositions, their use alleviates the issues with the additive or colorant clumping or insufficient dispersion. The concentration of the additive in the masterbatch is much higher than in the end-use polymer, but the additive is already properly dispersed in the host resin. In a way their use is similar to uses of ferroalloys for adding alloying elements to steels. The use of masterbatches allows the factory to keep stock of fewer grades of the polymer, and to buy cheaper natural polymer in bulk. The masterbatches can be fairly highly concentrated (in comparison with the target composition), with high "let-down ratios"; e.g. one 25 kg bag can be used for a tonne of natural polymer. The relatively dilute nature of masterbatches (in comparison with the raw additives) allows higher accuracy in dosing small amounts of expensive components. The compact nature of the grains of solid masterbatches eliminates problems with dust, otherwise inherent for fine-grained solid additives. Solid masterbatches are also solvent-free, therefore they tend to have longer shelf life as the solvent won't evaporate over time. The masterbatch usually contains 40-65% of the additive, but the range can be as wide as 15-80% in extreme cases.[1] The carrier material of the masterbatch can be based on a wax (universal carrier) or on a specific polymer, identical or compatible with the natural polymer used (polymer-specific). E.g. EVA or LDPE can be used as carriers for polyolefins and nylon, polystyrene can be used for ABS, SAN, and sometimes polycarbonates. When a carrier different than the base plastic is used, the carrier material may modify the resulting plastic's properties; where this could be important, the carrier resin has to be specified. The usual ratio of masterbatch to the base resin is 1 to 5 percent. Several masterbatches (color and various additives) can be used together.[1] The carrier can also double as a plasticizer (common for liquid masterbatches) or a processing aid. The machines are usually fed with premixed granules of the host polymer and the masterbatch. The final mixing then gets done in the screw and extrusion part of the machine. This is sometimes prone to adverse effects, e.g. separation of the masterbatch and the base material in the machine's hopper. The masterbatch can be also added directly to the machine's screw, as a free-flowing solid or in case of a liquid masterbatch by e.g. a peristaltic pump. Such use of liquid masterbatches allows highly accurate dosing and quick change of color between machine runs.[2][3] Masterbatches can be used in most processes, except rotational molding and Plastisol and other liquid resin systems. (fromWikipedia) For More info, pls visit httitanium.com.
Is injection molding machine just the same as dvdcd replicating machine?
no
When was the first injection molding machine patented?
The first injection molding machine patented in the year 1872. This machine was relatively simple compared to machines used this very days, but was very complicated in 1872.
What is the process used in injection molding?
Go to wikipedia and look up injection molding. You can also try www.mozdex.com/injection-molding-basics. Injection molding involves first having an injection molding machine. Second you must choose what shape you want to create, and have it drawn by a mechanical engineer. Then you must have the dies made at a machine shop to your specifications. Third you must select the type of plastic you want to make it out of, and set up your injection molder accordingly, and set it to run.
What is an injection molding machine made from?
It is made from different types of metal
What is the Injection Unit is responsible for injection molding machine?
It is responsible for material charging and injection. It helps inject the material into the mould.
How does ceramic injection molding work?
Ceramic injection molding is similar to plastic molding. It uses a machine that heats ceramic at a very high temperature. It will melt it than it will heat it to make it stay.
In case of injection molding process reduction of cycle time is depend on mold or machine?
machine
What is relation of shot capacity and shot weight in plastics injection molding?
Shot Capacity : The maximum weight of molten resin that the injection molding machine can push out with one forward stroke of the screw during injection molding operation. Shot weight : The weight of the material injected into the mold in a single shot by an injection molding machine. (Weight of the molded part(s) + Weight of the runner + gate and the sprue)
What is the Process of making plastic articles by injection molding machine?
extrusion moulding
What is the Machine hour rate of 200 ton injection molding machine?
Machine hour rate of 200 ton machine is 200*1.125= ?
Give me introduction about plastic injection molding machine?
work by lots of combine materials
What are the main differences between injection molding and blow molding?
In injection moulding the polymer is moltern and 'injected' into a mould. in blow moulding the polymer is as a sheet or as a parison that is pushed into a mould by air. I guess the main difference is injection moulding fills the mould with solid parts where as blow moulding just creates a thin surface
