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runner stick

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What is the runner stick
runner stick refer to a phenomenon in which the runner of the molded article fails to separate from the mold.

If the holding pressure is applied for a long time ,so that the size of the runner is increased, or the runner path portion of the mold is scratched or undercut, resistance is generated, so that the runner cannot be peeled off when the mold is opened.

Reasons for the  runner stickingInsufficient solidification of runner When the main runner is not fully cured, the shrinkage is small at this moment, and the runner is close stick to the mold, and the strength is also low. Therefore, if the runner is to be ejected at this time, it will be very easy to break. In this way, the runner will remain on the channel. Resin temperature, mold temperature, and cycle (cooling time) have an effect on the solidification of the main flow.
 Excessive  pressure holding The main runner channel is separated from the barrel nozzle directly, so it is easy to apply pressure. T…

Primary Parting Plane Runners

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In many cases, the mold design dictates the gating position, although ideally, the optimum gate position should be determined based on part requirements and afterwards the mold design should be selected to provide for the gate desired position.
Available gating positions, and gate designs, are significantly influenced by whether the runner travels along the primary parting plane of the mold (the parting plane where the part forming cavity is defined) or whether it does not travel along this plane.
In the dominant runner type used in the industry the runner and part forming cavities are located along the same primary parting plane.

Primary parting planes, often referred to as the parting lines, are where the mold opens and closes to allow ejection of the molded part and/or of the runner. The primary parting plane is the one where the molded part is formed and ejected. The primary parting plane runner is used in two plate cold runner molds.

A cold runner mold is defined as a mold in whi…

mold maintenance for operation and downtime

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Plastic Injection mold plays one of the most important roles in plastic molding process, its quality is directly related to the quality of products. Moreover, since plastic mold building occupies a large cost proportion of the production for a plastic mold company, and its life time directly affect injection products cost. Therefore, improving the quality of injection molds, conducting good maintenance and extending its life cycle, are important issues for any injection molding companies Due to product variety, frequent mold exchange on injection machine and longtime storing after production, there are many chances that mold get damaged. However, some plastic molding companies don’t pay much attention to mold maintenance, which invite corrosion on the mold, poor surface finish, and result in lower-quality product and high rejection rate. Statistics show that the usage and maintenance accounted for 15% to 20% in the mold life, the injection mold life in general can be up to 1 million ti…

TW plastic mold maker

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In spite of how many sumthat you would like,you can easliycomply with your desirethrough our ample plastic injection molding practical knowledge,as being China plastic injection moulds manufacturer,we act asa primaryforceand provide one-stop service for you, specialized in plastic mold design,plastic mold producing and plastic injection molding.
 TW injection mould makerhas providedcustomized injection molding. Manufacturerfor all sorts of plastic and nylon materials. Our keyconcentrationhas been around in plastic injection molding and toolsconstructing. You may expect mold making for OEM, computer, medical, aerospace, vehicular or any machinedcomponents.
Unigraphic and autocadare usually employed by us for design,the ordinarytypes we engage in are iges and .dwg.Those professional softwears can certainly help us and usersexperience astraightforward and profitableinteractingabout thefilling out your request,changeyour ideas into an …

How to deal with transparent injection molding

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How to deal with transparent plastic material PMMA,PC and PET injection molding Due to their high light transmittance, the requirement for transparent plastic surface need to be strict, it can not has any markings, voids, whitening, black spots, discoloration, poor gloss and other defects. Thus the whole injection molding process for raw materials, equipment, molds, and even product design, could be said very strict and sometimes even very special. Further more, because of most transparent plastic with high melting point, poor mobility, to ensure the surface quality of the products, it often needs make minor adjustments at high temperature, injection pressure, injection speed and other parameters, so that it could both fill plastic injection mold properly and will produce proper stress which would cause no deformation and cracking. How to dry the raw material Due to any impurities in plastics, they may affect the transparency of the product .Therefore on storage, transportation, feed…

What's injection molding technique

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What'sinjection moldingtechnique
Globally,people develop an ecnomical approach tohelp to makethe vast majority of plastic parts,which is known asplastic injection molding companyusedextensivelydue to itsaffordable and evenmodel.By means ofthis approach ,we're able togetseveralproducts like:container,stools,lounge chair,TV,table,autofender,plastic box,case,notebookcomponents,cell phoneand many others.The pressis used to construct the a variety of injection castpieces,and lots ofmanufacturersconstructdiversekind ofdimensions and shotcapacitymachineto meet this demand from customers.

During early 1868,an designernamedBob Wesley discovereda quick way toproduce plastic balls,which way nowdays is known as injection molding.Soon,the persondesigned a plunger type injection molding machine to improvemanufacturing. Anothercreator, Adam Hendry, elevated on Hyatt's invention and made a screw method of injection molding unit in 1946.
Bot…

Reason why we prefer plastic injection modling plastic part

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Reason whywepreferplastic injection modlingplastic part

Generally,people generate an ecnomical method tocreatemost of plastic parts,calledplastic injection moldingimplementedlargelybecause of itslower price and uniformmodel.Usingthis process ,we can easilydevelopnumerousspecific things like:bowl,bar stool,office chair,Television,stand,carfender,plastic basket,box,pcproducts,cell phoneand many more.The injection machineis utilized to construct the many different injection moldedpieces,and mostproducersmakevarioustype ofsize and shotamountdeviceto meet up this demand from customers.
The procedure of injection molding was created byDiane Wesley Hyatt. In 1868, the persondevelopedpool balls fromshooting celluloid inside a mold.A different type of injection molding deviceas well was invented bythat personshortly afterto helpproduction.A screw model of injection molding device was designed byA differentdesigner in 1946,and this unique …