Fifth, hose functional requirements
1, compression performance: can refer to the following two methods
After the hose is installed with a capacity of about 9/10 of the maximum capacity, cap the cap (with inner plug required to fit the inner stopper) and put it in a vacuum desiccator and vacuum it to -0.08 MPa for 3 minutes. No bursting or leakage.
10 samples were randomly selected from each batch of materials; water of the same weight or the same volume as the net content of each product was added to the sample tube and was naturally tapped; the tube was vertically statically pressed with the specified pressure for 1 minute, and the head area was ≥ 1 2 container force area.
2. Drop test: Load the contents of the specified capacity, cover the cover, and freely drop the cement floor from a height of 120cm. No breakage, end of explosion, or leakage, no hoses and covers are not tightly fitted, and no flip cover is loose.
3, cold, heat (compatibility test):
Immerse the contents in a hose or immerse the test piece in the contents and place it in a temperature range of 48°C and -15°C for 4 weeks. No change is found in the hose or test piece and contents.
One lot is tested for every 10 batches of material; 3 caps for each cavity are drawn from a batch of materials, and the total number of tubes used together with the tube is 20 sets; water with the same weight or volume as the net content is added to the tube; Amount of sample is heated in a thermostat to 48±2°C for 48 hours; 1/2 amount of sample is cooled in the refrigerator to -5°C to -15°C and left for 48 hours; the sample is taken out and returned to room temperature. external assessment. Eligibility criteria: No cracking or deformation of any part of the tube or lid (refers to changes in appearance that cannot be restored to the original state), discoloration, and no sealing or cracking of the hose or end of the hose.
4. Yellowing experiment: Put the hose under UV lamp for 24 hours or under sunlight for 1 week, no obvious discoloration compared with the standard sample.
5. Miscibility test: Immerse the contents in the hose or immerse the test piece in the contents. Leave it for 4 weeks at 48°C and -15°C. No changes to the hose or test piece and contents. .
6, adhesion requirements:
Pressure-sensitive adhesive tape peeling test: Use 3M 810 adhesive tape to adhere to the test site. After applying a flat surface (bubbles are not allowed), tear it off quickly. There is no obvious adhesion ink or hot stamping on the tape (requires ink, hot stamping off area <total area of printed letters. (5% of the surface) and a large area of varnish (<10% of the total surface area) fell off as acceptable.
Effect of contents: Friction rubbed back and forth 20 times with the finger with contents, and the contents did not change color and no ink peeled off was passed.
The bronzing shall not fall off with a diameter of 0.2mm or more, and shall not be broken or broken. The offset of the bronzing position shall not exceed 0.5mm.
Screen printing, hose surface, hot stamping: Each batch of 10 batches is tested. Each batch of material is randomly sampled 10, soaked with 70% alcohol for 30 minutes, the surface of the hose does not fall off, the failure rate is ≤ 1/10.