PIM Plastic Molding Company

Category: plastic mold company

  • Glossary of Terms (2)

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    FLOW LINES See SPLAY
    FREEZE TIME The time it takes to set the molded plastic resin for a variety of functions. For example, freeze time describes the time it takes to set the molded resin, in order for ejection to occur.
    FRONT CAVITY PLATE See “A” PLATE
    GATE An opening at the end of the runner through which the material enters the cavity.
    GUIDE PINS See LEADER PINS
    HARDENABILITY The ability of a material to become harder by the addition of alloying elements and heat treatment processes. It should not be confused with hardness.
    HARDNESS The resistance of a metal to surface indentation (denting) or abrasion (scratching). Indentation hardness can be measured with the Rockwell or Brinell methods.
    HEAT SINK A heat absorber or collector. It is used as a mold component or insert into the component to collect heat in an area that is hard to reach by typical cooling design. Materials typically used are copper, beryllium copper, tungsten alloys, and gas or liquid thermal pins.
    HOT RUNNER MOLD A molding method in which the runner system is kept hot and insulated from the cavity portion of the mold. The mold parting line is typically at the gate. This runner system is not ejected to become waste or regrind material, as it is in the cold runner system.
    INJECTION The process of forcing a plastic material or a molten alloy into a mold.
    INJECTION MOLDING The process in which the plastic material is heated to a molten state in a heating cylinder, and then forced into a cooled mold to produce the desired shape.
    INSERT Integral inserts – parts which are machined separately from the basic core and cavity, and are then installed in the proper position in the core and cavity, and which become part of the molded part after the molding material has hardened.
    INSERTS, MOLDED-IN Loaded inserts – not part of the mold, but separate metal pieces placed in the mold which become part of the molded part after the molding material has hardened.
    KNOCKOUT BAR See EJECTOR PLATE
    KNOCKOUT PIN PLATE See EJECTOR RETAINER PLATE
    KNOCKOUT PINS Term given to ejector pins.
    LEADER PINS Hardened and ground steel pins pressed into one of the plates. They align the two halves of the mold base. (Also called GUIDE PINS)
    LOCATING RING Fits into a counterbore in the top clamping plate and is used to locate the mold on the platen of the press so the nozzle and sprue bushing are aligned.
    MACHINABILITY The relative ease of which a metal can be machined or worked on with tools.
    MICROPROCESSOR A computer chip integrated circuit, capable of controlling the (Integrated Circuit) input and output functions, for which it was designed – such as automatically controlling the cooling cycle of a mold. 

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    MIRROR FINISH A diamond finish that shines and reflects light.
    MOLD The entire mechanism (cavities, cores, plungers, holder blocks, etc.) needed to mold parts from plastic materials or from non-ferrous alloys.
    MULTIPLE CAVITY MOLD A mold which has a number of cavities and produces more than one part in each cycle.
    ORANGE PEEL A condition caused by too much pressure, speed, or both when diamonding. When orange peel occurs the surface becomes bumpy and irregular.
    O-RING A tire-shaped, round cross-section of a synthetic rubber gasket or seal. A coolant seal can be formed by a compression fit of the O-ring and itÆs mating parts.
    PARALLELS Mounted on the bottom clamping plate under the support plate to form a space (ejector housing) which allows the ejection stroke when the piece parts are ejected. (Also called RAILS)
    PARTING LINES Marks on a molding where halves of the mold meets in closing.
    PIECE PART The article or part to be molded.
    PILLARS Bars placed between the support plate and the bottom clamping plate. Bolted or doweled to the bottom clamping plate, they are used as additional support for the core retainer plate.
    PLATENS The mounting plates of a press to which the mold assembly is bolted. 
    PROFILER Profiler is a brand name commonly used to refer to any reciprocating hand piece.
    PROTOTYPE MOLD A temporary or experimental mold construction made in order to obtain information on part design, tool design, and market reactions.
    PUSH BACKS See RETURN PINS
    RADIATE Emitting rays of heat, such as a mold-base radiating heat from the molding process.
    RAILS See PARALLELS
    REAMED HOLE A round, hard, multi-cutting edge scraping tool. It is used after a hole is drilled in order to improve the hole geometry. It will produce a rounder, straighter, and smoother hole than drilling.
    REAR CAVITY PLATE See “B” PLATE
    REAR CLAMPING PLATE See BOTTOM CLAMPING PLATE
    REDUCE DEFORMATION Elements added to control the amount of change in a metal due to stress, thermal change, change in moisture or other changes.
    RELEASE The ability of a mold to eject a part. 
    RETURN PINS Located in the ejector retainer plate. These pins force the ejector plate and ejector retainer plate and, therefore the ejector pins, to the bottom position as the mold closes. (Also called EJECTOR RETURN PINS, SAFETY PINS, or PUSH BACKS)
    REYNOLDS NUMBER A number used as a measure of turbulent flow for a liquid.
    RUNNERS Channels through which plastics flow from the sprue to the gates of mold cavities.
    RUST RESISTANCE The ability of a ferrous metal to resist oxidation in the presence of water (rust).
    SAFETY PINS See RETURN PINS
    SCAR An undesirable cosmetic mark left on the mold surface due to a variety of reasons, such as degating the part from the runner system.
    SENSORS A variety of devices designed to detect, measure, or record physical phenomena such as temperature.
    SHRINKAGE ALLOWANCE The additional dimensions that must be added to a mold to compensate for shrinkage of the plastic molding material on cooling.
    SPACER BUTTONS Pressed into the bottom clamping plate, they are lands for the ejector plate. (Also called STOP PINS)
    SPRUE BUSHING Butted up against the nozzle of the injection machine. Has a conical-shaped hole through which the material is forced into the mold runner. 

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  • Mold Base Technology

    Mold Base Technology

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    Cavity Plate, A Plate
    This plate holds the cavity in the mold. Its thickness is normally decided by the “depth” of the part. The runner system and gating are sometimes machined (half) in the surface of the plate. This surface is also the parting line surface and “shut off” (sealing) must be obtained or flash will occur.

       

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    Core Retain Plate, B plate
    This plate holds the cavity in the mold. Its thickness is normally decided by the “depth” of the part. The runner system and gating are sometimes machined (half) in the surface of the plate. This surface is also the parting line surface and “shut off” (sealing) must be obtained or flash will occur.

    B1-04

    Top clamping Plate
    This plate holds the cavity in the mold base. Its thickness is normally decided by the “depth” of the part. The runner system and gating are sometimes machined (half) in the surface of the plate. This surface is also the parting line surface and “shut off” (sealing) must be obtained or flash will occur.

    B1-05

    Supporting Plate
    The primary purpose of the supporting plate is to reinforce the mold during injection. It is actually a thicker plate that will not bows during the injection stage of the molding process. The ejector mechanism (pins) moves though the supporting plate.

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    B1-06

    Ejector bottom  Plate
    The actual ejector plate stands out as the floating plate during the ejector process. Its thickness is determined with the level of pressure necessary to remove the component and the part/mold dimension. This plate furthermore fastens the ejector system (pins or plate) inside the ejector retainer plate.
    B1-07
    Ejector top  Plate
    The ejector bottom plate is adopted in a mold to fix the ejector system (ejection pins, return pins, and so on) on the ejector plate. The retainer plate is head recessed  for every pin. The pin bottoms change to be flush with the back  on the plate and also the ejector plate then fastens straight to the retainer plate. In the course of ejection, the retainer plate “draws” the ejector system (pins) to its original position.
    B1-08
    Stripper  Plate
    The stripper plate is usually an ejector system employed to aid in component stripping. This plate is mounted on the ejector return pins and actuated traditionally. The plate thickness is determined with the pressure necessary to take away the component. The cavity shape should be precisely machined in to the stripper plate to prevent extreme tool wear and enable the stripper plate to “stay” properly whenever it’s retracted.


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  • How to decide a draft

    2011-11-13-03-32-06Among the most typical concerns we’re asked is “How to decide a draft I want to the texture that I want”
    The basic rule of thumb is the fact that you permit for 1.6 degrees of draft for every .001 inch of texture finish depth. Nevertheless, you will find other concerns that should be taken under consideration as a result of the numerous new resins and polymers, molding enhancements, and different other aspects that come into perform in contemporary plastic molding. Examples of scenarios that demand extra draft are thin wall component design and style and large strain molding.

    Some essential concerns to help keep in thoughts are:
    Will be the vertical wall in query an inside or outside wall? If it really is inside wall, the element will shrink onto it in the course of molding, which means you will want a lot more draft to be able to apply a texture, or apply the texture at a lighter depth.

    Specific plastics have really tiny shrinkage and can consequently not shrink far from outside walls as very easily as other plastics. Thermosets, Ryanite, Glass Filled PA, Glass Filled PP, ABS, PC, and so forth. will typically demand a lot more draft as a way to mold elements without scuff or drag marks.

    In the event the core is extremely easy, and there’s absolutely nothing within the core to hold the component in spot in the course of ejection, the element will have a tendency to hang onto the cavity, making scuff marks. The component might demand much more draft, or possibly texture might be utilized towards the core side. This assists hold the element onto the core in the course of ejection.

  • Injection Molding Method and cycle

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    Injection Molding Method

    With injection molding , the gravity deliver the granular plastic from a hopper right into a heated barrel. Since the granules are gradually pushed forward by a screw-type plunger, the plastic is forced right into a heated chamber called the barrel where it really is melted. As the plunger advances, the melted plastic is forced through a nozzle that seats towards the mold sprue bushing, enabling it to enter the mold cavity by means of a gate and runner method. The mold stays at a set temperature so the plastic can solidify virtually as soon as the mold is filled.

    Injection Molding Cycle

    The sequence of occasions throughout the injection molding of the plastic component is termed the injection molding cycle. The cycle starts once the mold closes, followed from the injection of the melt polymer to the mold cavity. When the cavity is filled, a holding pressure is maintained to compensate for material shrinkage. From the following stage, the screw turns, feeding the subsequent shot to the front screw. This triggers the screw to retract since the next shot is ready. As soon as the element is sufficiently awesome, the mold opens and also the portion is ejected.

  • What is injection molding ?

    injection molding vendorWhat is injection molding and What are the features about injection molded plastics? This approach allows suppliers to create goods of more challenging and elaborate shapes that could be too hard or costly to machine. The injection molded plastics procedure furthermore facilitates a large number of items to get created all at once using the same mold. Additional advantages comprise significant processing rates, decreased workcrews expenses and higher repeat tolerance, plus there certainly is minimal require to do whatever to finalize the part once it is usually molded. The untouched plastic pellets and runners can also be reprocessed for potential future molding therefore there is virtually virtually no waste product.
    if you would like bulk construction for intricate objects,the injection molding is a good determination ,and the upcoming show few already mentioned and unmentioned.* Injection molding allows for significant manufacturing output ranges.
    For a few particular usage ,you could possibly fit an insert into tooling or even add in addictives for strenght consideration
    you can get exactly the same dimension and outlines for objects
    We might benefit from over-mold to build the items for different color choice and varied substance in the mean time.
    Commonly,we’d like uncommon effort for second operation immediately after injection molding,as well as the items finish is actually very same.
    *Most scrap may well be reground that can then be used again, consequently there may be little waste.
    * Whole automation may be accomplished with the help of Injection Molding. 

  • Blog

    NX part: M11-7.6Staying a full services offer for china plastic injection molding business and main company in plastic mold and plastic injection molding section,we could fulfill your different quantity demands with regard to shots from Five hundred to thousands and thousands parts.our strenght is ideal for heavy duty and consumer plastic mold constructing and plastic molding.Custom injection molding and mold building are main services which are available from us,and our goods fields includes:OEM mold producing,construction,consumer , motor vehicle ,agriculture or any other machine made work pieces.we would produce numerous plastic molding work pieces,which enable it to have capacity for shot sizes from 1.2 oz to 44 oz. for injection molded parts and up to 8 KG. meant for blow molded parts.We make use of SolidWorks for part and mold building design- one hundred percent centered on item design, SolidWorks aids producers get products to market faster with more precise and effective products designs. Converting what you want much faster for on-time shipping.

    Usually in the mold constructing procedure, it is possible to offer rapid prototypes employing 3D printing and thermoplastic technology and review all aspects of mold design along with the user, complete with procedure and plastic mold troubleshooting, to be certain a high-quality, accurate mold everytime.