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China Designing an Injection Chair Mould: A Comprehensive Guide

Date: 2023-8-4


Injection molding is a widely used manufacturing process for producing plastic products. The process involves injecting molten plastic material into a mold cavity, which then cools and solidifies into the desired shape. Designing a mold for injection molding requires careful planning and consideration of various factors. This comprehensive guide will provide step-by-step instructions on designing an injection chair mold.

Step 1: Conceptualize the Design

The first step in designing an injection chair mold is to conceptualize the design of the chair itself. Consider the intended use, aesthetics, and functionality of the chair. Sketch out the basic shape and dimensions of the chair, and make any necessary adjustments to ensure it can be manufactured using injection molding techniques.

Step 2: Mold Layout Design

Once the chair design is finalized, the next step is to create a mold layout design. This involves determining the number of cavities needed in the mold, as well as their placement and orientation. Factors to consider include the size of the chair, material flow, and parting line location. Use computer-aided design (CAD) software to create a 3D model of the mold layout.

Step 3: Gate Design

The gate is the entry point for the molten plastic material into the mold cavity. The gate design plays a crucial role in achieving proper filling and avoiding defects such as air traps or flow marks. Consider factors such as gate size, location, and type (e.g., edge gate, pin gate, or submarine gate). Simulations can be performed to optimize gate design and ensure efficient filling of the mold.

Step 4: Cooling System Design

Efficient cooling is essential for achieving shorter cycle times and consistent part quality. Design the cooling system to ensure uniform cooling throughout the mold. Consider factors such as coolant flow rate, placement of cooling channels, and the use of baffles or bubblers to enhance cooling efficiency. Utilize thermal analysis software to optimize the cooling system design.

Step 5: Ejection System Design

The ejection system is responsible for removing the molded parts from the mold cavity. Designing an effective ejection system is crucial to avoid part damage or deformation. Consider factors such as ejection pin placement, type of ejection (e.g., stripper plate or ejector pins), and ejection sequence. Ensure proper draft angles on the chair design to facilitate easy ejection.

Step 6: Mold Material Selection

Selecting the appropriate mold material is essential for achieving a high-quality mold that can withstand the injection molding process. Factors to consider include mold temperature, part complexity, and expected production volume. Common mold materials include steel alloys, aluminum alloys, and beryllium copper alloys. Consult with material suppliers or mold manufacturers for guidance on material selection.




Step 7: Mold Base Design

The mold base provides the foundation for the mold components and ensures proper alignment and stability. Design the mold base to accommodate the mold layout, cooling system, and ejection system. Consider factors such as size, material, and the inclusion of features such as guide pins, bushings, and locating rings. Utilize standard mold base components to reduce costs and manufacturing time.


Designing an injection chair mold requires careful consideration of various factors, from the initial conceptualization of the chair design to the selection of mold materials and components. Following the step-by-step guide outlined above will help ensure the successful design and manufacture of an injection chair mold. Proper design and optimization will result in efficient production, consistent part quality, and overall cost-effectiveness in the injection molding process.

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