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What Is Back Pressure in Injection Molding?

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Injection molding is one of the most widely used manufacturing processes for producing plastic parts — from everyday consumer goods to high-precision automotive and medical components. While many factors influence the quality of an injection-molded part — such as temperature, injection speed, and cooling time — one often overlooked but critical parameter is back pressure. In this article, we’ll break down what back pressure is, why it matters, how it affects product quality, and how to optimize it for consistent molding results.   What Is Back Pressure in Injection Molding? In simple terms, back pressure is the resistance applied by the hydraulic system to the screw as it rotates and moves backward during the plasticizing (or recovery) phase of the injection molding cycle. When the screw rotates, it melts the plastic pellets and conveys the molten material toward the front of the barrel. As the molten plastic accumulates in front of the screw, the screw gradually moves b...
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What Is SIS in 3D Printing?

Selective Inhibition Sintering (SIS) is an additive manufacturing ( 3D printing ) process that offers an alternative to more conventional powder-based metal or polymer sintering techniques like Selective Laser Sintering (SLS). Developed by researchers (notably at the University of Southern California), SIS seeks to produce parts by inhibiting sintering (or melting) in certain regions, rather than directly sintering or melting all regions via high-energy sources (lasers, electron beams, etc.). What is SIS in 3d printing ? In simpler terms, in SIS you deposit a base powder (metal or polymer), then selectively apply an inhibitor over the areas you don't want to sinter. Afterwards, you subject the whole thing to a sintering furnace (heat), which fuses the non-inhibited regions to form the final solid object, while the inhibited regions remain loose or non-sintered, acting as sacrificial or “support” material. After sintering, the loose material can be removed, leaving the desired ...
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What Is the ISO Standard for Injection Molding?

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Injection molding is a mature, highly precise manufacturing method primarily for plastics (and sometimes elastomers). Because many industries demand consistent quality, interchangeability of parts, and safety assurance, ISO (International Organization for Standardization) standards play a key role in defining norms for processes, testing, safety, quality, and terminology. However, there is no single ISO standard that covers everything about injection molding. Rather, a network of ISO standards applies to various aspects—test specimens, machinery safety, testing protocols, tolerancing, quality systems, domain-specific standards, etc. This article surveys the major ISO standards relevant to injection molding : what they cover, how they are used in practice, and what considerations manufacturers and designers should be aware of.   Brief Overview: What Is ISO? ISO (International Organization for Standardization) is a global, non-governmental body that develops and publishes...
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Factors to Consider in Injection Mold Design？

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Injection molding is one of the most widely used manufacturing processes for producing plastic parts in high volume with consistent quality. At the heart of this process lies the injection mold design —a critical step that determines not only the efficiency of production but also the performance, durability, and cost-effectiveness of the final product. A well-designed mold reduces cycle time, minimizes defects, and prolongs tool life. On the other hand, poor design choices can lead to warpage, sink marks, excessive scrap, or costly maintenance. Whether you are an engineer, a product designer, or a manufacturer, understanding the key factors in injection mold design is essential for successful project execution. This article explores in depth the factors to consider in injection mold design , covering technical, material, and economic perspectives to guide you toward creating effective and reliable molds.   1. Understanding Injection Mold Design Basics Before diving into t...
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