The so-called "Buddha depends on gold, people depend on clothes", similarly, the appearance of plastic mask case is very important, due to the different precision of the production of plastic mask case, the selection of raw materials and different process parameters, its appearance dimensional accuracy will be different. The appearance detection of plastic mask case mainly includes the overall shape, surface tone, gloss, appearance quality and other visual quality characteristics of the plastic mask case bottle.

1. Measurement of the diameter of plastic mask case: The measuring method is to use the measuring surface of the vernier caliper to contact the measuring place of the maximum outer diameter of the bottle body, tighten the vernier caliper, and then rotate the plastic mask case body 360 degrees, and record the size of the maximum and minimum values, and the error should be controlled within 0.1Omm.

2. Measurement of outer diameter of plastic mask case: The specific measurement method is to cross the center of the bottle mouth with the measuring tool, avoid the position of the bottle body mold line, and rotate the round bottle mouth 360 degrees at the thread of the main shaft tight mouth, measure the maximum and minimum value, and compare with the bottle design drawing, and the outer diameter error should be controlled within the range of positive or negative O.10mm.

3. Measurement of wall thickness of various parts of plastic mask case: For the plastic mask case of the circular rotary body, the measurement area of the symmetrical part is cut with a tool, so that the measuring tool can enter the detection point of each part of the bottle body. At this time, the thickness of the plastic mask case mouth, the thickness of the shoulder, the thickness of the body, and the thickness of the bottom of the bottle can be strictly measured, and the maximum and minimum values are recorded, and the dimensional tolerance is checked whether it is within the standard requirements by comparing with the unqualified drawings of the bottle body products.

4. Measurement of overall height and size of plastic mask case: The so-called overall height size of the plastic mask case bottle refers to the vertical distance between the mouth of the plastic mask case and the bottom of the bottle. The test method is to place the plastic mask case on the horizontal surface, touch the end of the vernier caliper to the highest point of the bottle mouth, and then rotate the bottle 360 degrees. Read out the maximum and minimum size values, and check with the design size. For example, the size error of 40-60mm bottle height should be controlled within the range of 0.5mm.

The appearance quality inspection of plastic mask case is based on the different defects in each part of plastic mask case, and different appearance defect standards are formulated. The appearance quality of the bottle is usually marked with a physical minimum allowable limit or a standard sample is made, and it is best to seal one of each defect in the standard sample for comparison and verification.

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