Plastic Injection Mold Manufacturing Since 2005

What is the procedure to decide the injecting pressure in plastic molding?

Table of Contents


Plastic Injection molding process (injection molding) is a technique in which thermoplastic or thermosetting molding materials are plasticized uniformly in a heated barrel before being forced through an injector and plunger into an empty spiral injection molding machine with closed mold cavity via plunger/moving screw for solidification in cooling chamber.

The molding cycle of plastic injection molding presses is short (several seconds to minutes), the quality of molded products can range from a few grams to tens of kilograms, and molded products with complex shapes, precise dimensions, and metal or non-metal inserts can be molded in one go. Therefore, this method has strong adaptability, high production efficiency and can be produced in large quantities.Injection molding is suitable for almost all thermoplastics. Typical products: automotive plastic parts, consumer electronics plastic casings, etc.

Controlling injection pressure molding is of great significance as it plays a major role in the quality, integrity and performance of plastic products manufactured. We will explore all of its intricate details herein this article; including how this essential procedure affects plastic molding results as well as finding optimal injection nozzle pressure levels to create an effortless manufacturing process.

II. Understanding the Importance of Injecting Pressure

Injection molding pressure refers to the force applied by injection machines during an injection molding process to feed liquid material into molds for injection molding, also referred to as one of its process parameters (typically measured in tons). Injection molding pressure has direct implications on product dimensional accuracy, appearance quality and physical properties as well as production cycle time – so controlling its level during molding allows greater product control during its creation process.

Understanding Injection Pressure

1. Control Dimensional Accuracy

Injection molding pressure control can significantly impact dimensional accuracy for plastic products. During injection molding processes, more consistent injection clamping pressure also results in reduced variation range for product dimensions resulting in better precision of results and greater product accuracy.

2. Control Surface Quality

Injection molding pressure has an enormous influence over product surface finish and venting performance, as gas attached to mold core surfaces is discharged, eliminating defects like bubbles and tumors from appearing. Furthermore, using appropriate injection pressure when feeding plastic helps squeeze oxygen and moisture out from plastic pellets so as to decrease defects like voids, clouds, scratches and warpage on its surfaces.

3. Regulate Physical Properties

Injection molding pressure has an immense influence over the physical properties of products manufactured. In general, higher injection mold machine pressures lead to denser products with increased density levels and better physical characteristics.

III. How to control injection molding pressure?

1. Material properties

The size and change of injection pressure are affected by the properties of raw materials. Generally speaking, raw materials of the same brand have different injection pressure requirements.

2. Mold structure

The structure and gap design of the mold also have a great impact on the control of injection pressure. Reasonable mold design can effectively control the size and change of injection pressure.

3. Adjustment of injection molding equipment

The adjustment of injection molding machine equipment is also very important for the control of injection pressure. When performing injection molding, reasonable the initial injection pressure of molding machine equipment can greatly improve the stability and controllability of injection pressure.

In short, injection molding pressure is a very important parameter in the injection molding process and has a very important impact on the quality and performance of injection molded products. When controlling the injection molding pressure, it is necessary to comprehensively consider the nature of the raw materials, the design of the injection molding machines exert and the adjustment of the injection molding equipment, so that the injection molding pressure can be controlled stably and reasonably, so that the quality and performance of the product can achieve the best results.


Understanding and controlling injection pressure in plastic molding are critical components to producing parts that meet desired specifications and standards. We explored its significance throughout this article; here are a few takeaways:

Injection pressure is of critical importance in creating complete and uniform filling of mold cavities with liquid plastic material, without defects such as voids, bubbles or surface irregularities – in other words ensuring consistent dimensions and tolerances across final products.

Injection pressure helps address warping and shrinkage issues for greater part stability, as it affects plastic parts’ structural strength – something injection pressure plays a huge part in. Thus it the injection process becomes an integral component in prolonging their durability over time.

Manufacturers use a systematic process for identifying optimal injection pressure. This may involve selecting materials, designing molds and considering wall thickness as part of simulation and testing sessions as well as trial and error adjustments prior to production, then continuous monitoring during operations.

Optimizing injection pressure is key in creating cost-efficient plastic molding processes while still meeting high product quality standards, and ensures each plastic part conforms with industry requirements for application across various applications and sectors.

Precision and attention to detail in setting and controlling injection pressure are vital ingredients of plastic molding excellence, producing products of exceptional quality and performance.

Latest Posts
Share on facebook
Share on twitter
Share on linkedin
Share on pinterest

Email: info@zetarmold.com

Or Fill Out The Contact Form Below:

Ask For A Quick Quote

Send drawings and detailed requirements via 


Or Fill Out The Contact Form Below:

Спросите быструю цитату

Мы свяжемся с вами в течение одного рабочего дня, обратите внимание на письмо с суффиксом «xx@zetarmold.com».

Ask For A Quick Quote

Send drawings and detailed requirements via 


Or Fill Out The Contact Form Below:

Ask For A Quick Quote

Send drawings and detailed requirements via 


Or Fill Out The Contact Form Below: