Stretch film performance test

Stretch film performance test

Stretch film performance test
Stretch film production is started from the late 1980s into the 1990s, China's coastal cities have introduced foreign stretch film packaging equipment. A variety of stretch film production is also increasing, so that the industry developed rapidly. LLDPE stretch film performance test method there are several:
Following a brief stretch fils to maintain the tension, viscosity, permanent deformation, elastic recovery, anti-puncture test methods.
Tension to keep the pallet stretch films in a certain percentage of stretching after a certain time to maintain the state of the tensile force and f value of the ratio of force to maintain tension, expressed as a percentage.
Test procedure
1 sample in the test stretch films taken five specimens, the specimen width of 25mm (horizontal to test samples for the specimen width), sample length is 150mm.
2 samples in each stretch film measuring 5 points on the vertical thickness, and whichever is the arithmetic mean thickness accurate to 0.001mm; the tensile testing machine jaw adjustment range 125mm, so that five samples were set two fixtures on the test machine, the specimen axis and coincides with the center line of the upper and lower clamps; test speed 125mm/min ± 12.5mm/min.
The pallet stretch films stretch the sample to a predetermined elongation (50%, 100%, 150%, 200% four) waiting for 60s ± 2s.
Testing machine according to the original speed of the sample to the original location to relax and wait for 180s ± 2s.
Tensile testing machine back to the pre-elongation of the specimen position. silage film and cling film and stretch film is basically the same test.
Viscosity
Viscosity refers to the stretch film stretch or tension in the state, the adhesion between two layers of stretch films.
Test procedure:
1. Stretch film viscosity test in the test should be three markings on the slope, as shown in Figure a, respectively, indicating the slope of the midline, and the 25mm width of the middle slope position.
Inclined plane in the test specimen should have a different strain rate indicates the scale line. Scale line distance from the top edge of slope were 0mm, 50mm, 75mm and 100mm, respectively, corresponding to the stretching rate of the sample; not stretch, stretch 50%, 100% stretch and stretch 200%.
(2) take a group of pe stretch film sample, the sample will be 500mm × 125mm, the length of the longitudinal direction with the slope, tile and fixed in the test on the slope, within the face, the stretching ratio in the desired slope to find the corresponding the tick marks, according to the scale markings on the sample; use guide uniform tensile specimen, so that marking up the slope of the top, locking the sample; to 180mm × 25mm, vertical and inclined in the same direction, one end of the sample aligned with the slope top, tile to have a fixed specimen, inside-the next, and brush with a special adhesive so that the two samples formed; samples from the upper slope to slope the bottom of the center line curl and the curl part of the clip with a firm fixture ;
To boost the speed of 125mm/min ± 12.5mm/min fixture until two sample separation, the separation process of recording the value of the most vigorous, accurate readings to 0.1n.
Longitudinal elastic recovery, permanent deformation and tension to keep
Elastic recovery is pallet stretch film in the stretch to maintain a certain percentage of the state after a certain time, the recovery after the release of the original size and size ratio, expressed as a percentage. silage film and cling film and stretch film is basically the same test.
Permanent deformation is the stretch film in the stretch after a certain percentage, the increase of the ratio of length and original length, expressed as a percentage.
f force value is stretch film under a predetermined maximum tensile elongation force. silage film and cling film and stretch film is basically the same test.
Resistance to puncture
Resistance to puncture resistant stretch film is used to indicate the ability of acupuncture to wear. Piercing process with membrane rupture force values and expressed through the time displacement.
Test procedure:
Sampling: At least five specimens. Size of 180mm × 180mm.
Calibration of test equipment, select the appropriate sensor. Fixture calipers to the center and needles in the same axis. The sample placed inside the caliper, the needle and the sample surface in contact with the zero state. The instrument needles start to 250mm/min ± 12.5 mm / min speed test. Test will be when the needle completely through the film stops. If the stretch film rupture in another location, then the sample void. In fact, stretch film testing and silage film and cling film is somewhat similar to the test. Only silage film and cling film and stretch film in the function is somewhat different. Understand the test stretch film above the performance of several methods, you can test the production of stretch film quality, companies can know where the deficiencies, to improve, consumers can also buy through these methods to stretch film. JINING HONGXIANG PACKING MATERIAL CO., LTD is LLDPE stretch film manufacturer