If you work with custom injection molded plastic parts, you have almost certainly seen a thin seam running along the edge of a component. This is the parting line (PL) — one of the most fundamental, and most misunderstood, features of injection molding.
Many buyers mistakenly think a parting line means the product is two separate pieces glued together. This is not true. The finished plastic part is molded as one single piece in one shot. The line simply marks where the two halves of the injection mold close and seal together before plastic is injected.
Plastic parts with undercuts cannot eject directly along the mold opening direction. Mold designers have three mainstream mechanical solutions: slides (side actions), lifters (angled ejectors), and collapsible cores. Many engineers confuse these three structures. This article explains their working principles, use cases, pros & cons, and selection logic for your DFM review and quoting.
READ MOREQuality control is the backbone of every reliable injection mold. A well-executed QC workflow catches dimensional errors, surface defects and assembly issues before the injection mold leaves our factory, avoiding costly rework and production delays for mass molding. Our mold QC system covers three critical stages: CMM coordinate measurement, first article inspection (FAI), and mold pre-shipment inspection.
READ MOREPoor scratch resistance is one of the most common complaints for injection molded plastic products. Many base thermoplastics like ABS, PP and PA12 are relatively soft on the Mohs hardness scale. Fine dust, daily contact and friction will leave visible scratches easily.
There are multiple ways to boost scratch resistance for your injection molding parts. We can divide the solutions into 3 categories: material modification, mold & structure optimization, and post-mold surface finishing.
When manufacturing decorative ribbed plastic tiles, choosing the right surface finish is critical. Your selection directly impacts appearance, unit cost, wear resistance, production yield and environmental compliance. For 3”×6”, 8mm thick ABS tiles with parallel ribs, especially for medium-to-large batch orders up to 73,000 pieces, there are 5 practical finishing solutions to consider.
READ MOREPA12 (Polyamide 12 / Nylon 12) is widely selected for outdoor equipment because of its low moisture absorption, excellent low-temperature toughness and chemical resistance. When formulated with UV stabilizers, UV-resistant PA12 becomes an ideal material for vehicle tracking housings, outdoor sensor enclosures and exposed cargo safety components.
UV additives and PA12 base resin together bring unique challenges for mold design and molding. Improper tooling will cause yellowing, gas burns, silver streaks, warpage and dimensional drift.
