Construction Injection Molds Classification

classification or types of mold injection very depend on what we need to make the plastic parts, because every parts have specific and unique design. when design molds we must see what the influencing factor like geometry, number of cavities, ejection principle, plastic material and shape of parts.The...

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Introduction to Mold Engineering of Thermoplastic

most electrical, and home appliances made from plastic, one of technology to make plastic product is using mold, specially injection mold of thermoplastic, basically when thermoplastic material heated, they will change of state, thermoplastic material will become soft, melt and flowable, when cooled...

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Top Plate, Stripper Plate,Sprue Bush and Runner Lock Pin Design

at the picture below you will see a set of Top plate until stripper plate design related with runner flow, at this picture support pin exclude. the mold type in this picture is 3 plate type.the runner system accommodates the molten plastic material that coming from barrel, and guide it into mold cavity,...

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Types of Runner depending temperature

there are various concept and type of runner, here we will give explain about runner type depending on the temperature control, we could divide in 3 type :1. Standard runner system2. Cold runner system3. Hot runner systemstandard runner system are directly machined into the mold plates (plates 2 or...

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When we need slider parts in Mold Design

second previous post i have post about the slider parts and construction in complete mold base , then now i give a little brief when we need slider in mold design, basically we design mold from our customer, first is we must look the parts that we will make by plastic mold, look mare at the drawing...

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Mold Handling Picture after Assembly

Picture below show 3 plate mold after assembly, the position indicate ready to handling by crane, eye bolt was attached at center of mold plate.after assembly process, make sure you has attached the tension link in 3 plate mold type or safety bolt or magnet in 2 plate type of mold this to prevent mold...

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Slider Design and Basic Construction

picture below show slider basic construction in Mold, various construction and litle part available in slider but the basic construction of slider is same, look picture below, sorry if this picture is too grainy, i'll make a new one.the main part from those picture is mold plate, number 1 until 10 is...

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Coring uniform wall thickness

when design a mold then we find nonuniform wall thickness, we can make little graduation translation using core, of course if there was not function parts, ordinary parts like not cosmetic parts, touching with others parts, sliding and etc, should we change by making insert in core or cavity side. look...

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Wall Thickness Design - Maksimum

Dependent on the part design and size, typically, for injection molded parts, the wall thickness will be in the range 0.5 mm to 4 mm (0.02 - 0.16 inch).For parts made from most thermoplastics, nominal wall thickness should not exceed 4.0 mm. Walls thicker than 4.0 mm it is will increase time required...

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Wall thickness in mold design

when design a product The basic wall of the part of the melt during injection, should be kept uniform, this important to prevent sink after injection.even we use cooling after injection part well deform because shrinkage, at this time if wall thickness does not same part will warpage stressthey key...

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SPRUE BUSH and LOCATING RING

when you choose sprue bush, make sure you was know the diameter ball nozzle of plastics injection (SR) is less than diameter ball (SR - at picture below indicate by R)if diameter R of Sprue bush to little than nozzle SR diameter, that will not good match or touching, if injection machine working plastic...

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Runner System and Construction

picture below show a simple runner system in mold construction, begin from nozzle until gate, nozzle for mold usually located in plate 1, plate 1 is upper plate, when you design a runner system, basically like picture below, you must know location of product, is important when we decide where gate...

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Mold Timing and Terminology

Dry-cycle: The total time required for the (machine) clamp to close and open, or the sum of the mold opening and the mold closing time. Today’s fast machines have dry-cycles in the order of 1–3 seconds. A short dry-cycle is of particular importance with fast-cycling molds. The dry-cycle also depends on the length of the clamp stroke.Opening time: Usually quite fast. The ejection preferably should take place during this time,to reduce (or to omit...

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Assembly Inspection New Mold

Pre-Assembly Inspection for a New or Reworked Mold there are following important point to check list when assembly a new or reworked mold, following pinture below show three plate mold when all parting line open• Check all shutoff areas with spotting blue. Tryout any pieces to be insert molded in assembly,...

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Assembly and Disassembly Mold

The following is a good checklist for disassembly and assembly of a plastic injection mold. Some of our customers to not have trained moldmakers on staff to perform this kind of assembly and disassembly so we have listed a procedure here to help give your tooling room staff a good start, HOWEVER, this...

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Hot runner construction and method

Hot runner is a method in plastic injection molding with a mold suitable for use insimultaneous molding of a large number of articles at a time by hot-runner molding technique. The mold has a hot-runner block in which disposed are a plurality of gates through which the molten resin is delivered to the...

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Mold part and construction

Many type of mold in the platic industry but generally mold devide in 3 big section there are :Two plate moldTwo plate mold basically when opening the product after plastic injection process mold just devide in two parts core side and cavity side, this type molding only have one parting line, product...

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Polystyrene Injection Process

Polystyrene is one of the best materials for injection moulding. Cycle times with polystyrene are usually short due to ease of melting, fluidity and reasonable set up times. Complex tooling can be used.The surface finish of the final product is also good, and the low mould shrinkage of polystyrene is a useful factor.Moreover, due to good inherent thermal stability, polystyrene can easily be recycled.Finally, polystyrene can be easily compounded...

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Injection moulding preparation

Each mold works starts with preparation of the molding machine and peripheral device and check of the mold and material, This basic injection mold preparation is Preparation of moldPreparation of plastic materialInstallation of moldSetting temperatureSetting molding conditionStarting molding Those a step by step to prepare moulding, the explanation each step can read below 1. Preparation of mold Before installing a mold, check the...

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Blow Molding

Blow Molding is a highly developed molding technology developed back in the late 1800's to produce celluloid baby rattles. It is best suited for basically hollow parts (such as plastic bottles) with uniform wall thicknesses, where the outside shape is a major consideration. The first polyethylene bottle was manufactured using the blow molding process in December of 1942. This was the real beginning of a huge industry which currently produces 30...

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Injection Molding Basic Knowledge

So, what is injection molding?To put is basically, injection molding is the process of forcing melted plastic in to a mold cavity. Once the plastic has cooled, the part can be ejected. It is useful when the parts are too complex or cost prohibitive to machine. With this process, many parts can be made at the same time, out of the same moldInjection Molding is the process of forcing melted plastic in to a mold cavity. Once the plastic has cooled,...

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Molding Methode

1. Injection moldingis a manufacturing technique for making parts from thermoplastic material. Molten plastic is injected at high pressure into a mould, Injection mouldings count for a significant proportion of all plastics products from micro parts to large components such as bumpers and wheelie bins. Virtually all sectors of manufacturing use injection moulded parts - the flexibility in size and and shape possible through use of this process have...

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