How to ensure that soft plastic packaging is not easy to break in cold environments - Database & Sql Blog Articles

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Abstract: Soft plastic packaging stored in a cold environment requires high cold resistance, that is, the physical and mechanical strength of the packaging material is not significantly deteriorated compared to the standard environmental conditions. If the soft plastic packaging is poor in cold resistance, it will easily lead to cracking of the finished packaging in a low temperature environment. Therefore, the cold resistance of the soft plastic packaging used in a low temperature environment is an extremely important physical and mechanical performance index. In this paper, the FIT-01 film impact tester is used to test the pendulum impact energy, and further introduce the relevant industry users how to verify the cold resistance of soft plastic packaging and ensure that the soft plastic packaging is not easy to rupture in cold environment.

Key words: cold resistance, pendulum impact energy, low temperature environment, cold environment, cracking, soft plastic packaging, plastic bag, FIT-01 film impact tester

1, meaning

Some foods or medicines need to be stored in a low temperature environment to ensure that they are not easily deteriorated or thawed. Sometimes the ambient temperature is required to reach minus 18 degrees, and this temperature jeopardizes the external packaging materials while ensuring the quality of the contents. Performance, which may cause problems such as a broken package and a leak. For example, the quick-frozen dumplings did not show bag rupture during the production line, but cracked at the bag or seal after freezing storage. Most of the above-mentioned quality problems are related to the poor cold resistance of the packaging materials, that is, the flexibility and impact resistance of the packaging materials are deteriorated at low temperatures, resulting in intolerance to external impacts.

In soft and cold environment, the physical and mechanical strength of the soft plastic packaging will be deteriorated, especially brittle and cracked, which is related to the change of the chemical structure of the internal polymer material at low temperature. In order to improve the soft plastic packaging material is not easy to be brittle at low temperature, it is necessary to add a toughening agent and other additives to the raw material, but the cold resistance is exactly how it can withstand the low temperature environment, and should be verified by the cold resistance test. Cold resistance is obtained by comparing the anti-pendulum impact energy measured under standard environmental conditions with a temperature of minus 18 ° C. For example, the cold resistance is not less than a fixed percentage ratio (for example, the cold resistance of BOPA/LDPE composite film is not less than 60%), indicating that the physical and mechanical strength of the packaging material at low temperatures has not changed significantly. In this paper, the FIT-01 film impact tester independently developed by Jinan Languang Electromechanical Technology Co., Ltd. is used to test the cold resistance of quick-frozen dumpling bags, which provides technical reference for related industries.

Figure 2 FIT-01 film impact tester

4.1 Test principle

The hemispherical punch of the film impact tester impacts at a certain speed and passes through the film sample to measure the energy consumed by the punch, thereby evaluating the anti-pendulum impact ability of the film.

4.2 Scope of application

(1) This equipment is suitable for the accurate measurement of anti-pendulum impact performance of plastic film, sheet, composite film, metal foil and other materials. It can also be used for anti-pendulum impact performance test of paper and paperboard, such as cigarette paper aluminized paper. , Tetra Pak packaging aluminum plastic paper composite materials.

(2) The equipment meets a number of national and international standards: GB 8809-88, ASTM D3420, NF T54-116.

4.3 Equipment parameters

l Impact energy is 1 J, 2 J, 3 J (expandable to 5 J) with a resolution of 0.001 J.

lThe diameter of the punch is divided into 25.4 mm, 19 mm and 12.7 mm. The other non-standard sizes can be customized.

l The diameter of the sample jaws on the equipment is 89 mm and 60 mm, respectively.

l The range is adjustable, and the electronic measurement can easily and accurately test under various test conditions.

l Pneumatic clamping of the sample, the pneumatic release of the pendulum and the horizontal adjustment auxiliary system effectively avoid the systematic error caused by human factors.

l The system automatically collects test data and visually displays the test results to the user.

l Support Lystem ^TM laboratory data sharing system, unified management test report and test results.

5, the test process

(1) Evenly cut 10 pieces of 100 mm × 100 mm or 100 mm diameter specimens in the width direction of the film, and place the sample at a temperature of 23 ± 2 ° C, 45% ~ 55% RH for at least 4 h, and Test in this environment.

(2) Test the thickness of the center position of each sample, take the arithmetic mean of the test results of 10 samples, and record the thickness of the sample.

(3) According to the anti-pendulum impact energy required for the sample, the size of the punch is selected so that the reading is

instrument

Between 10% and 90% of full scale.

(4) Calibrate the instrument according to the rules of use of the instrument.

(5) Place the sample flatly in the holder to ensure that the sample has no wrinkles or excessive tension around the bed, ensuring that the impact surface of the 10 samples is consistent.

(6) Turn the pointer to the maximum scale, press the handle, and quickly release the pendulum, so that the pendulum impacts the sample and records the reading displayed by the instrument.

(7) Evenly cut 10 pieces of 100 mm × 100 mm or 100 mm diameter samples from the film width direction, place the sample at -18 °C for 2 h, repeat steps (2) ~ (6 ) Continue the experiment.

(8) The anti-pendulum impact energy measured after placing the environment at -18 °C is divided by the anti-pendulum impact energy measured under standard environmental conditions, which is cold resistance, and the unit is %.