Injection molding defects typically arise from four factors: material, process, mold, and machine. This guide covers 28 common defects, prioritized for quick on-site troubleshooting. Part 1: Surface/Appearance Defects Defect Description Key Solutions 1. Sink Marks Local surface depression Increase pack/hold pressure…

Every mold factory says they have experience.The hard part is figuring out who actually does — and who is just talking. Here‘s what real experience looks like in our trade. Not from a textbook. From years of making mistakes, fixing…

1. The Problem: Why Do Molds Often “Misbehave” After Transfer? The mold is finished, shipped, and arrives at the customer‘s factory. Then the team puts it on the machine — and problems show up: Does this mean the mold was…

1. The Problem: The Long‑Standing Challenge of Undercut Ejection In parts with undercut features, conventional forced ejection often leads to a series of issues: surface scratches, sticking, stress whitening, and even direct scrap. The root cause is simple: the part is…

In the injection molding of fan blades, cooling design is a critical factor affecting product quality, dimensional stability, and production efficiency. Fan blades typically feature a thick central hub and thin blades, creating significant wall thickness variation. This often leads to uneven cooling,…

In the consumer electronics industry, the product enclosure not only provides structural strength and heat dissipation but also serves as a key expression of brand aesthetics. Achieving high-quality appearance while ensuring stable, high-volume production remains a core challenge in mold…

At RiLong, we don’t just mold silicone. We overmold it onto metal inserts — often for customers who have already been burned by delamination, shifting inserts, or invisible rejects. Below are five practical lessons we’ve learned the hard way. If…

In plastic injection molding, the initial tooling cost is always a hot topic. I often hear: “Can we find a cheaper mold?” But after years in this industry, I’ve learned one hard truth: Mold price is what you pay upfront;…

Drawing from years of project experience, We’ve summarized the following cost-reduction strategies from four dimensions: production efficiency, part design, material standardization, and maintenance optimization. We hope these insights prove valuable to industry peers. Strategy 1: Mold Structure & Production Efficiency…

Injection molding brings your product to life—but surface finishing gives it soul. For plastic parts, the real differentiator between “ordinary” and “premium” often lies in the post-molding treatment. The same ABS or PC material can feel like metal, ceramic, or…

Incorporating multi-material designs (e.g., rigid plastic + soft TPE) into products not only enhances grip comfort but also adds functionalities such as waterproofing and shock absorption. However, choosing between Two-Shot Molding and Overmolding is often the first major challenge engineers…

Optimizing Gate Design to Avoid Sink Marks (Dents) in Injection Molding The core principle behind optimizing gate design to prevent sink marks is to ensure that the molten material can effectively pack out the thick-walled areas during the holding pressure…