Pp plastic strapping belt is mainly made of polyethylene and polypropylene resin as the main raw material, and it is extruded through uniaxial stretching. PP plastic packing belt for packaging has very high production technology requirements.
At the same time, it also researches the packaging tape testing methods and inspection rules, and now tells you the testing methods, and also hopes that customers and friends can We supervise the quality of our packaged products, and we will strictly require ourselves to create high-quality packaging for everyone.
1, technical requirements:
(1) Appearance: The appearance should be uniform in color, neat and clear, no obvious pollution, no impurities, no cracks, damages, perforations, etc. are allowed.
(2) Size specification width: 13.5mm±0.5mm Thickness: 0.9mm±0.1mm
(3) Physical and mechanical properties Tensile strength at break is not less than 1.1KN, elongation at break is not more than 25%.
(4) Skewness skewness is not more than 30mm
(5) The tension at the interface is determined by our experiment. The refrigerator or freezer with a capacity of 160 litres or more, and the window machine and outdoor unit of the air conditioner with a maximum pull force of not less than 400N for the strapping interface;
160-litre refrigerator or freezer and air-conditioned outdoor unit, no less than 350N.
(6) The strap should be tightly tied to the carton when the test product is pulled out. When the strapping is bundled in the direction of the package size greater than 600mm, the following pullout test shall be performed: When the pulling distance is 50mm, the pulling force is 19.6N-50N.
(7) The length of the bundling interface bundling interface is not less than 20mm, and the interface width is not less than 9.5mm.
Test method for testing whether the packing tape is qualified:
1. Sampling Provisions Random sampling of 5 plastic packing tapes. After removing 3m at the outer end of each roll, 5 samples of the 3m plant were taken.
2. Five 200mm-long specimens were sampled on the five sample tapes.
3, width of each sample measured in 2, a total of 10 records of 10 measurements.
4. Thickness Measure the thickness (including pattern) of the middle part of each sample, and measure two points for each sample, totaling 10 points.
5, visual inspection under normal light.
6. Determination of Tensile Fracture Strength and Breakout Tensile Rate (1) The sample shall take five 300mm long samples with an effective distance of 100mm.
(2) The state of the sample is adjusted under normal temperature and humidity.
(3) Tensile Fracture Strength Measurement (4) Elongation at Break Test The arithmetic average of the test results of five samples was taken.
7. Determination of skewness (1) Five samples of 1.2 m in length were taken from the five samples.
(2) Instruments, utensils Transparent organic glass plates and a ruler with an accuracy of 1 mm.
(3) free lay, one end fixed, pressed with a transparent plexiglass, with the ruler to measure the arithmetic mean of the maximum offset distance of the sample for the skewness of the sample, accurate to 1mm.
8, Determination of strapping interface tension (1) The sample takes two 300mm long samples, the effective distance between the two ends of the interface is not less than 100mm
(2) Interface tensile test Tensile speed is 100mm/min, interface pull off force.
9, pull out the test (1) measuring precision 0.1N spring balance, precision 1mm ruler.
(2) Along the strapping line 300mm away from one end of the box, use a spring balance to hook the strapping to pull it out. The pull must be perpendicular to the face of the box.
10, inspection rules (1) to accept the unit as a batch, the same formula, the same specifications as a batch of packing.
(2)Specifications and skewness shall be tested in batches, each batch of random samples shall be tested, and the test results shall be judged according to requirements. If they are not qualified, they shall be hard-doubled and sampled for review.
(3) The physical and mechanical properties are randomly sampled every 5 batches. The inspection results are judged according to requirements. If they are not qualified, the batch is unqualified.
(4) The strapping interface tension and pull-out test are performed once a week for each line, 2 at a time, and the determination is made as required.
