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vickers-valve

30 Common Problems and Solutions in the Injection Molding Process

30 Common Problems and Solutions in the Injection Molding Process This article will tell you some common problems in the injection molding process and also the corresponding solutions. 1. The product runs off the edge (flash edge)when being turned on. The reason and solution of the product lacking glue after a period of production. When […]

injection-parts-1

How to Solve the Burnt Injection Parts?

How to Solve the Burnt Injection Parts? For some reasons, injection molds often get burnt during the production. With different  causes of the burnt injection parts like machinery, mold or molding conditions, the solutions adopted are also different.  1.  Machinery for example: For the overheating of barrel due to abnormal conditions, the resin is decomposed […]

polycarbonate

What Problems Should Be Paid Attention to When Producing PC Products?

What Problems Should Be Paid Attention to When Producing PC Products? Raw material drying PC plastics, even touching a bit of water, the situation of bonds broken for hydrolysis, lower molecular weight and lower physical strength will occur. Therefore, before molding, the moisture of polycarbonate should be strictly controlled below 0.02% to avoid the reduced mechanical […]

injection-molding

How to Avoid the Serious Shrinkage Problem During Injection Process?

Why Can’t Overly Quick Glue Injection Help Solve the Problem of Serious Shrinkage? To avoid the shrinkage, the first thing we think is to increase the injection pressure and extend the injection time. But if the injection speed has been adjusted very quickly, it is not conducive to solving the shrinkage problem. Therefore, when it’s […]

PET preform

8 Points for Attention in PET Preforms Molding

8 Points for Attention in PET Preforms Molding Resin processing PET macromolecules contain lipid groups and have a certain degree of hydrophilicity. Pellets are sensitive to water at high temperatures. When the moisture content exceeds the limit, the molecular weight of PET decreases and the products are colored and brittle during processing. Therefore, before processing, the materials must be […]

Parting-Line

How Would the Weld Line Occur ?

How Would the Weld Line Occur ? This article has showed the  phenomenon, causes and solutions of the weld line occuring in the prossess of injection molding. 1. Phenomenon Materials flow in two or more directions. When they join again, the resin temperature drops and they don’t fuse, which results in a weld line. 2. […]

short-shot

How to Avoid Short Shot in Plastic Products?

How to Avoid Short Shot in Plastic Products? 1. Phenomenon An incomplete phenomenon in which the resin is not completely filled. And this is called short shot. 2. Cause Overly runner/gate diameter Long runner Large flow resistance in cavity Poor degassing of sprue and runner Insufficient air escape in the mold Lack of supply Insufficient […]

warped-plastic

How to Deal with the Warpage in Injection Molding?

How to Deal with the Warpage in Injection Molding? 1. Phenomenon A phenomenon in which a molded product warps in a convex or a concave shape immediately after molding.     2. Cause Unbalanced protrusion of molded products Bad mold release Uneven cooling Big gate Stick out quickly High injection pressure, high injection speed Short injection/holding time […]

Sink-Marks

Sink Marks: Tips For Solving The Problem

Sink Marks: Tips For Solving The Problem Phenomenon The phenomenon that the surface of a molded product is dented due to shrinkage. It is often found in thick molded products. Cause Small gates, sprues and runners Poor gate position Insufficient cooling time Overly high or low mold temperature Low injection/holding pressure Short injection/holding time 3. Measures […]

flash

Parting-line Flash: Guide for Avoiding

Parting-line Flash: Guide for Avoiding Phenomenon A phenomenon in which the resin squeezes out and solidifies on the parting line of the mold. Cause There is a gap in the mold Foreign matter is attached between the mold plates Rising internal pressure(insufficient vent) High injection pressure Insufficient mold clamping force Large material supply High resin […]

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