Custom Injection Molding

Author: Kenny

  • How to Pack a Jar PET Preform Mold

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    PET preform molds are heavy, precise tools. A jar preform mold weighs tons. Its cavities are polished, its neck rings delicate, its leader pins exact. Bad packing ruins all of that in one trip. Clean and Protect the Mold First Clean the mold fully before packing. Spray cavities and cores with rust-preventive oil. Coat moving…

  • 4 Common PCO 28mm PET Preform Injection Problems and Fixes

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    PCO 28mm is one of the most common neck finishes for beverage preforms. When injection problems appear, they usually fall into a few familiar patterns. Here are four common ones — with causes and fixes. 1. Whitening at the Preform Bottom A white, hazy patch at the base of the preform. The PET at the…

  • How to deal with transparent injection molding

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    Injection Molding Guide How to Deal With Transparent Injection Molding Transparent parts show everything. A black speck invisible in a black housing ruins a clear lens. Molding PMMA, PC, or PET means controlling the full chain — dry material, clean barrel, polished steel, and a process tuned for optics, not just dimensions. Table of Contents…

  • ribs of plastic part

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    Why Ribs Exist Plastic parts need stiffness, but solid thick walls are the enemy. They waste material, extend cooling time, and cause sink marks on the opposite surface. Ribs solve this. They are thin reinforcing walls molded into the part that add rigidity without the penalty of thick sections. A well-ribbed part can be several…

  • Ejector Pins and Sleeve

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    Mold Design Guide Ejector Pins and Ejection: How Parts Leave the Mold The part is molded, cooled, and perfect — and now it has to come out without damage. Ejection sounds simple until a pin punches through a thin wall or drag marks ruin a cosmetic face. Here is how ejection actually works and what…

  • Mold Action

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    What Mold Actions Are Most plastic parts have features the mold cannot form with a straight open-and-close motion: side holes, undercuts, internal threads, snap-fit hooks. Mold actions are the moving mechanisms inside the tool that form these features and then get out of the way before ejection. The three families are slides, lifters (angle lifters),…

  • Mold Polishing and Finishing: Process, Equipment, Materials & Troubleshooting

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    Mold polishing, also called mold finishing, is one of the most skill-intensive steps in injection mold manufacturing. After machining, grinding, or EDM, the cavity and core surfaces still carry cutter marks, EDM recast layers, and uneven textures. Polishing removes these imperfections and creates the exact surface the plastic part requires — a mirror gloss, a…

  • Mold Cooling: Channels, Design and Troubleshooting

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    Once the hot polyester resin goes into the mold it ought to be cooled quickly. Cooling permits the molded component which will keep its preferred pattern when it’s demolded out of the mold. When cooling isn’t offered ,the hot polyester resin may normally heat up the mold steel to a level ,so component cooling to…

  • Injection Mold Runners, Gates and Vents: A Design Guide

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    In injection molding, part quality is decided long before the plastic reaches the cavity. The runner system — sprue, runners, and gates — controls how melt flows into the mold, while vents control how air escapes. Get these right and the mold fills evenly, packs out completely, and ejects cleanly. Get them wrong and you…

  • Glossary of Injection Molding Terms (Part 3)

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    SPRUE PULLER PIN Pin located directly under the opening of the sprue. Used to pull the molded sprue out of the bushing after a shot has been made. SPRUE BUSHING RETAINER RING See LOCATING RING STONING The process of refining all surfaces of the cavity or core with manufactured stones. SUCKER PINS See SPRUE PULLER…