The wall thickness of injection plastic part has a great influence on the quality. When the wall thickness is too small, the flow resistance is large, and large and complicated plastic part marking are difficult to fill the cavity.
The minimum size of the wall thickness of the plastic parts should meet the following requirements:
• Has sufficient strength and stiffness ;
• Can withstand the impact and vibration of the demolding mechanism when demoulding;
• Can withstand the tightening force during assembly.
Injection molding plant have a minimum wall thickness value that varies depending on the type of plastic, the grade, and the size of the product. Excessive wall thickness in the processing of plastic parts not only wastes raw materials, but also increases molding time for thermosetting plastic molding processing, and is likely to cause incomplete curing. For thermoplastics, the cooling time is increased. In addition, it will affect the quality of plastic injection moulding processing. The wall thickness of the same injection molded part should be as uniform as possible, otherwise additional stress will be generated due to uneven cooling and curing speed.
It is important to determine the wall thickness of custom plastic injection molder reasonably. The wall thickness of plastic part manufacturing is determined first by the requirements of the plastic parts, including the strength, quality cost, electrical performance, dimensional stability and assembly requirements of the parts. The general wall thickness has empirical values, which can be determined by reference. The iron is generally 2mm thick and the vacuum cleaner is 2.5mm. The notes are as follows:
• The wall thickness of the plastic part production should be as uniform as possible to avoid too thin, too thick and abrupt wall thickness. If the molded part plastic require wall thickness changes, gradient or arc transition should be used, otherwise the plastic parts will be deformed due to uneven shrinkage. Affecting the strength of plastic part maker affecting the molding process such as fluidity during injection molding plastic part;
• The wall thickness of plastic parts is generally in the range of 1-5 mm, and the most commonly used value is 2-3 mm;
• Try not to design the ribs and screw posts too thick. It is generally recommended to take half of the wall thickness of the body to be safer, otherwise it may cause appearance problems such as microcosm;
• Try not to design the part as a separate plate, the size is small, otherwise the deformation will result in uneven parts.
Post time: Feb-14-2019