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Creating a Plastic Injection Chair Mould: Design and Manufacturing Techniques

Date: 2023-6-23

Plastic injection moulding is a manufacturing process that is widely used in the production of plastic parts and components. It involves the use of a machine that melts plastic pellets and injects the material into a mould to form a desired shape. One of the most common applications of plastic injection moulding is in the production of chairs, which requires an intricate and well-designed mould to achieve the desired shape and functionality. In this article, we will discuss the design and manufacturing techniques of a plastic injection chair mould.


The first step in creating a plastic injection chair mould is to design the mould itself. This involves careful consideration of the chair\’s shape, size, and intended use. The mould designer must take into account factors such as the chair\’s weight capacity, the types of materials that will be used in production, and the aesthetics of the final product.

Once the design of the mould is complete, the designer must decide on the appropriate materials to use in the mould\’s construction. The mould itself is typically made of steel or aluminum, which can withstand the high temperatures and pressure involved in the injection moulding process. The designer must also determine the placement and orientation of the mould\’s various components, such as the ejector pins, cooling channels, and gate locations.


With the mould design complete, the next step is to manufacture the mould itself. This process involves several steps, including rough machining, finish machining, and heat treatment.

During rough machining, the basic shape of the mould is created using a large milling machine. This process removes most of the excess material and creates the mould\’s basic shape. Finish machining is then used to create the final shape of the mould, including the intricate details needed for the chair\’s design.




After the mould is machined, it must undergo heat treatment to improve its strength and durability. This process involves heating the mould to a high temperature and then cooling it slowly to create a hardened surface layer. This layer helps to prevent wear and tear on the mould during the injection moulding process.

Once the mould is complete, it is ready to be used in the injection moulding process. This involves loading the mould into an injection moulding machine and injecting molten plastic into the mould under high pressure. The plastic then cools and solidifies, and the mould is opened to remove the finished chair.


Creating a plastic injection chair mould requires careful planning and attention to detail. The mould designer must consider the chair\’s shape, size, and intended use, while also taking into account the materials and manufacturing techniques involved in the injection moulding process. With proper design and manufacturing techniques, a high-quality chair can be produced consistently and efficiently using plastic injection moulding.

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