Venting insert design of molded parts

In the thin-walled cavity, the end of the melt flow, the bottom of the blind hole of the mold cavity, the end of the solid column of the plastic part, the bottom of the plastic part rib and screw column, and the corners of the complex cavity are the most where it is easy to cause air trapping, the exhaust in these area mainly depends on the exhaust slot on the shut-off surface between the inserts and the exhaust slot.


图片1.png


Venting design of molded parts:

a. When the end of the material flow is not on the parting surface due to the restriction of the cavity structure, the matching gap between the molded parts can be used to exhaust;

b. Some parts of the forming parts that constitute the cavity, such as ejector rods, ejector pines, moveble parts, etc., the cavity or core are mostly used for clearance fit, and the matching gap is large, if it is designed in the end side of material flow, it can also serve as an exhaust gas, and there is no need to set up an exhaust system at this time;

C. When the exhaust rate cannot meet the requirements, an exhaust structure can be set on the corresponding parts to increase the exhaust rate (see the picture as below);

d. The transitional fitting inserts should have an exhaust slot at the end of the material flow in advance (see the picture as below);

e. The three-stage exhaust slot must be open to the outside of the mold and connected with the air;

f. The exhaust slot between the inserts is easily blocked by plastic powder or mark, and must be cleaned regularly.


Tags: Injection Mold | Injection Mold Supplier | Injection Mold Factory | Mold Factory | Mold Supplier | Injection Molding |
Related News about USM Injection Mold
  • Plastic part ribs desigining

    Plastic part ribs desigining

    Jan 4, 2022The ribs function: The role of ribs is to improve the strength and rigidity of the plastic parts, prevent the plastic parts from being distorted and deformed, and will not cause the appearance of the...view
  • The principle of mold temperature balance in plastic mold cooling system design

    The principle of mold temperature balance in plastic mold cooling system design

    Feb 21, 2022The principle of mold temperature balance: 1. Due to the complexity of the plastic parts and mold structure, it is difficult to make the temperature of the mold completely consistent, but should be...view
  • Slider spring hength and strength calculation

    Slider spring hength and strength calculation

    Apr 22, 2024Processing size: 1. ØD2=ØD+2 2. Ll = total spring length (L) - preload value of spring (N) - slider core pulling distance (L2) Spring length calculation: (refer to picture 1 for length calculation)...view
  • Slider angle designing tips

    Slider angle designing tips

    Dec 4, 20231. Normally, all the insertion slopes of the slider are not allowed to be less than 3° to prevent excessive self-locking force and scratched; 2. The angle of the locking surface must be bigger than...view
  • Five Major Steps of the Injection Mold Production Process

    Five Major Steps of the Injection Mold Production Process

    Dec 9, 2021Injection mold manufacturing can be roughly divided into the following steps: Process analysis of plastic products. Before the mold design, the designer should fully analyze and study whether the...view
  • Venting system of plastic injection mold introduction

    Venting system of plastic injection mold introduction

    Feb 27, 2022Hello everyone, thanks for attention. We’ve discussed about the temperature control system earlier, now we are going to talk about the mold venting information in following 11 articles, from the...view