How Much Does The Wall Thickness Of Plastic Parts Affect The Quality?
The wall thickness of plastic parts processing has a great influence on quality. If the wall thickness is too small, the flow resistance is large, and it is difficult for large and complex plastic parts to fill the cavity. The minimum size of the processed wall thickness of plastic parts should meet the following requirements:
1.Have sufficient strength and rigidity;
2. It can withstand the impact and vibration of the demolding mechanism during demolding;
3. It can withstand the tightening force during assembly.
The injection molding factory stipulates a minimum wall thickness value, which varies due to the variety, brand, and size of plastic parts. Excessive wall thickness in the processing of plastic parts is not only a waste of raw materials.
For thermosetting plastic molding processing, it also increases the molding time, and it is easy to cause incomplete curing; for thermoplastics, it increases the cooling time.
In addition, it will also affect the quality of plastic parts 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 solidification speeds.
| Plastic parts material | Minimum wall thickness | Recommended value
for small parts | Recommended value for medium-sized parts | Recommended value for large parts |
| PS | 1 | 1 | 2~2.5 | 3~4 |
| ABS | 1 | 1.5 | 2~2.5 | 3~4 |
| PP | 0.8 | 1.5 | 2~2.5 | 2.5~3.5 |
| PE | 0.8 | 1.2 | 1.6 | 2.5~3.5 |
| PC | 1 | 1.8 | 2.5 | 3~4.5 |
| POM | 1 | 1.5 | 1.6 | 3~5 |
| PMMA | 1 | 1.5 | 2.5 | 4~6.5 |
It is very important to determine the wall thickness of plastic parts reasonably.
The wall thickness of a plastic part is first determined by the use requirements of the plastic part: including the strength of the part, quality cost, electrical performance, dimensional stability, and assembly requirements. Generally, the wall thickness has an empirical value, which can be determined by referring to similar (such as Irons generally have a wall thickness of 2mm, and vacuum cleaners generally have a wall thickness of 2.5mm). The points to note are as follows:
a. The wall thickness of the plastic parts should be as uniform as possible, avoid too thin, too thick, and sudden wall thickness changes. If the wall thickness changes are required for the plastic parts, a gradual change or arc transition should be adopted, otherwise, the plastic parts will be deformed due to uneven shrinkage. , Affect the strength of plastic parts, affect the fluidity during injection molding, and other molding process issues.
b. The wall thickness of plastic parts is generally in the range of 1-5mm. The most commonly used value is 2-3mm.
c. The minimum wall thickness of commonly used plastic parts and the recommended value of commonly used wall thickness: (mm)
d. Try not to design the stiffeners and screw columns too thick. Generally, it is recommended to take half the body wall thickness for safety, otherwise, it is easy to cause appearance problems such as miniatures.
e. Try not to design the parts as separate flat plates. if the size is small that will not be as this, otherwise, the parts will be uneven due to deformation.
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