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Why Do Need The Draft Angle For Texture Injection Molds ?

Injection mold texturing, as a surface decoration treatment technology, endows products with unique visual texture and tactile sensation by forming specific texture effects on the mold surface. However, this process places higher demands on the demolding performance of the mold. If the mold design does not consider the draft angle, or if the draft angle setting is unreasonable, problems such as difficulty in demolding and texture damage are prone to occur during the etching process, which seriously affects the yield and appearance quality of the product.

Therefore, in the design of etching patterns on injection molds, it is particularly important to scientifically set the draft angle. It not only helps the workpiece to be smoothly demolded during the etching process, but also effectively reduces scratches and damage caused by friction, ensuring the perfect presentation of the sun drying effect.

1.Based on product depth and material characteristics: The size of the draft angle needs to be determined comprehensively according to factors such as the specific depth, wall thickness, and shrinkage rate of the selected plastic material of the product. Generally speaking, larger draft angles should be used for deeper products and materials with higher shrinkage rates.

2.Ensure uniformity and smoothness: The design of the draft angle should ensure that the product surface is uniform and smooth, avoiding unnecessary scratches and deformation during the demolding process. For products with high precision requirements, smaller demolding angles should be chosen to ensure surface quality.

3.Consider treatment requirements: For injection molded parts that require appearance treatment such as etching and sandblasting, the side walls should be appropriately increased in demolding slope to accommodate the additional stress that may be generated during the treatment process, ensuring the perfect presentation of texture effects.

4.Follow industry standards and experience values: In practical operation, reference can be made to industry standards and experience values. For example, in general, the demolding slope of PS material should be greater than 3 °, and the demolding slope of ABS and PC material should be greater than 2 °, etc., to ensure the rationality and feasibility of the design.

In summary, the design of the draft angle in the etching process of injection molds is crucial. It not only affects the difficulty of demolding the product, but also directly affects the appearance quality and yield of the product. Therefore, in the mold design stage, the design principles and techniques of draft angle should be fully considered to ensure the scientific and rational design of the mold. Only in this way can we produce injection molded products with excellent quality and exquisite appearance, meeting the diverse needs of the market.