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How to inspect the phone case

2020-2-27

 
 
The mobile phone protective cover is a product that we are very familiar with. It not only protects our mobile phone from being scratched, abraded, and injured, but also makes the mobile phone more beautiful and easy to use.

During the inspection of the mobile phone case, we need to check whether the material meets the standards and whether it has a pungent odor; the color difference of the appearance, surface treatment, workmanship, and product size must be within the maximum allowable range.

In addition, it is very important to test the performance of the product. Let ’s share some basic tests of mobile phone cases.

 



1. High and low temperature storage test:

Store the sample in a low-temperature environment at a temperature of -40 ° C ± 2 ° C for 24h; then store it in a high-temperature environment at a temperature of 70 ° C ± 2 ° C for 24h; after the test is completed, leave it at room temperature for more than 2h to check the appearance of the sample.
The result was judged that no dissolution, discoloration, cracking, and peeling of the holster on the surface of the sample were deemed acceptable.

2. Constant temperature and humidity test:

Store the samples in a constant temperature and humidity environment at a temperature of 55 ° C ± 2 ° C and a relative humidity of 95% ± 3% for 48 hours. After the test is completed, leave it at room temperature for more than 2 hours to check the appearance of the sample.
Result judgment: The sample surface is considered as qualified if it has no leather shrinkage, lift, discoloration, bulging, etc.

3. Temperature shock test:

Put the sample in a temperature shock test box, keep it for 1 hour in a low temperature environment of -40 ° C ± 2 ° C, switch the temperature to a high temperature environment of 70 ° C ± 2 ° C within 3 minutes, and keep it for 1 hour. A total of 24 cycles ( 48h). After the test is completed, check the appearance of the sample.
The result was judged that the sample had no defects such as leather shrinkage, lifting, discoloration, bulging, etc., and it was regarded as qualified.

4. Salt spray test:

The sample was subjected to a neutral salt spray test. In a closed environment at 35 ° C ± 2 ° C, humidity is ≥85%, and the pH value is in the range of 6.5-7.2. Rinse the sample with water, and check the appearance of the sample after it has been left for more than 2 hours at room temperature.
Result judgment: The surface of the sample has no leather shrinkage, lift, discoloration, bulging, etc.

5. Hand sweat test:

Sweat (Note: The main component of sweat is 1.07% ammonia, 0.48% sodium chloride, and the rest is water.) The soaked non-woven fabric is affixed to the surface of the product and sealed with a plastic bag. After 24 hours at room temperature, After taking out, wipe the sweat on the surface of the product and leave it for 2h to check the appearance of the paint.
The result is judged that the product has no defects such as leather shrinkage, lifting, discoloration, bulging, etc., which are considered as qualified.

6. Cosmetic resistance test:

Wipe the surface of the sample clean with a dust-free cloth, apply petroleum jelly (special moisturizing formula) on the surface of the sample, and place the sample in a constant temperature and humidity box (temperature set at 55 ℃ ± 2 ℃, relative humidity 95% ± 3 %) After 48 hours, remove the sample, wipe off the cosmetics on the surface of the sample, and leave the sample at room temperature for more than 2 hours to check the appearance of the sample.
The result was judged that the sample had no defects such as leather shrinkage, lifting, discoloration, bulging, etc., and it was regarded as qualified.

7. Back buckle pull test

At normal temperature, use a tensiometer to perform a tensile test on its part with a tensile force of 10KG. Observe the site after the test is completed.
The results were judged to be qualified if there were no defects such as fracture or damage in the relevant parts of the sample.

8. Alcohol resistance test

Dip a pure cotton cloth with absolute alcohol (concentration ≥95%), wrap it on a dedicated 500g / cm2 weight pier, and rub it back and forth on the surface of the sample at a speed of 45-60 times / minute with a stroke of about 20mm One back and forth).
The results were judged to be qualified when no more than 300 cycles were observed on the surface of the sample and the substrate was exposed.
  
9. Abrasion test (screen printing)

Using a special NORMAN RCA abrasion tester (model: 7-IBB-647) and a special paper tape (11/16 inchwide × 6 or 8 inchdiameter), apply a load of 175g to drive the paper tape to rub on the surface of the sample.
The result is judged that the silk screen is impervious to the bottom and the substrate is exposed. It is qualified if it reaches more than 300 cycles.
 
10. Adhesion test (silk screen)

Use 3M600 adhesive tape or equivalent adhesive tape to firmly adhere to the test area, and use an eraser to wipe the tape firmly to increase the contact area and strength of the tape with the test area. After standing for 1 minute, hold the end of the tape with your hand. Quickly peel off the adhesive tape at 90 degrees, and perform the same test 3 times at the same position.

The result is judged that: 3M adhesive paper is not adhered to block or flake paint and other defects are considered acceptable. 2PCS for each routine test.
 
 
 

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