Adding your logo to injection molded plastic parts is one of the most important steps in building a brand. A well-placed, durable logo tells customers who made the product and signals quality. But if you've never done it before, the number of options can be overwhelming.
Should you engrave the mold? Use in-mold labels? Print after molding? Laser engrave?
This guide breaks down every method — how it works, what it costs, how durable it is, and which one is right for your specific situation.
If you’ve ever requested injection mold quotes, you’ve probably seen a bizarre industry phenomenon: the same mold can be priced wildly differently. Professional mold factories offer a standard budget, while small workshops submit bids at half the price or even lower.
These “cheap cabbage-price molds” look like a great deal at first glance. But most manufacturers who chase low prices end up losing far more money in mass production.
Why has the mold industry fallen into vicious price competition? What exactly is wrong with ultra-low-cost molds? Today, we break down the hidden tricks, massive production losses, and practical tips to avoid cheap mold pitfalls.
If you’ve ever held a comfortable non-slip tool handle, a soft-touch toothbrush grip, or a flexible silicone protective case, you’ve touched overmolding products. Overmolding is one of the most popular plastic molding technologies in daily manufacturing. It bonds two different plastic materials together in one molding process to create products with better grip, durability, comfort and functionality.
Many people only know overmolding as “adding a soft layer on plastic”, but in fact, it has three core types based on hard and soft material matching: hard plastic + soft plastic, hard plastic + hard plastic, and soft plastic + soft plastic. Each type has unique features and specific usage scenarios. Today, let’s break them down simply.
Injection mold polishing is one of the most critical processes in plastic injection manufacturing. Many people believe that injection mold polishing only makes the mold look shiny, but in fact, professional injection mold polishing directly determines the surface quality, yield rate, and production stability of all plastic products.
Without standard injection mold polishing, mold surfaces will retain tool marks, machining lines, tiny scratches, and rust spots. These minor defects will be completely copied to the plastic surface during injection molding, resulting in dull appearance, sticky mold, air marks, and uneven texture. Therefore, high-quality injection mold polishing is the foundation for producing high-grade plastic parts.
If you work in injection molding, product design, or plastic manufacturing, you must have encountered these common problems: inconsistent product dimensions, surface sink marks, uneven warping, or unstable mass production sizes. In most cases, the root cause is plastic shrinkage.
Plastic shrinkage is an unavoidable physical change during the injection molding process. When molten plastic fills the mold cavity and cools down from a high-temperature fluid state to a solid state, its molecular structure tightens and the volume shrinks. However, shrinkage is not fixed—it fluctuates greatly according to materials, mold designs, and production processes.
Today, we will break down four core factors affecting plastic shrinkage rate, helping you quickly troubleshoot defective products and optimize molding quality.
