Puncture resistance verification scheme for yoghurt plastic cup sealing aluminum foil cover film

ã€Chinese Packaging Network Newsã€‘ Puncture resistance is an important indicator performance of soft plastic film, that is, packaging material resistance to external force puncture performance, "puncture resistance" or "puncture strength" to characterize its performance. For the packaging of finished products using soft plastic film packaging, storage, transportation and distribution, the inside of the package is subject to sharper hard objects (such as bamboo sticks, sticks, bones, flavoring particles, and corners of frozen dumplings, etc.) or the outside world. Punctures, impacts, and other forces that often come into contact with sharp objects (such as the hard edges of other bags). If the packaging material is poor in puncture resistance, ie, the puncture resistance or the puncture strength is low, a pinhole hole may appear on the surface of the package, resulting in leakage or leakage of the finished product package, or even a significant bag breakage, thereby making the interior package Deterioration, leakage, and other quality problems.

Plastic cup yoghurt packaging often uses a metal film containing aluminum foil as a cup cover film, that is, a composite film formed of aluminum foil and other plastic films. Because yoghurt contains a large amount of fat and protein components, its packaging materials are required to have high oxygen barrier properties, and the cover film of this material has a high barrier property, which can guarantee the excellent oxygen barrier of the yoghurt cup; at the same time, it is easily punctured by straws. Easy to eat, but does not mean that the cover film's anti-piercing force is as small as possible (that is, the cover film is easy to pierce), and must meet certain puncture resistance to prevent accidental injury caused by external objects. In this paper, the XLW (EC) intelligent electronic tensile testing machine independently developed by Jinan Languang was used to carry out the relevant puncture resistance test on the cover film of a certain brand of yogurt plastic cup aluminum foil composite film material.

2, standard

The testing methods for the puncture resistance of soft plastic packaging in China are mainly based on the relevant tests in GB/T â€œPlastic composite film for packaging, bag dry compounding, extrusion compoundingâ€ in â€œ6.6.13 Puncture strengthâ€.

3, test sample

A brand yogurt cup cover film (aluminum foil composite film).

4, testing equipment

This article uses Labthink blue light XLW (EC) intelligent electronic tensile testing machine to test the puncture resistance of the sample.

4.1 Test principle

According to the actual puncture direction, it is determined which of the inside and outside surfaces of the sample faces the puncture needle, and the specimen is clamped using a special jig. The puncture needle mounted on the moving chuck will move at a certain speed until the puncture sample, the force sensor and the displacement sensor located on the moving chuck will accurately record the change of the force value during the entire puncturing process.

4.2 Equipment Applicability

(1) XLW (EC) intelligent electronic tensile testing machine is suitable for plastic film, composite materials, soft packaging materials, plastic hoses, adhesives, adhesive tapes, stickers, medical patches, release paper, protective film, Combining covers, foils, separators, back sheet materials, nonwovens, rubber, paper, etc. Puncture resistance, stretching, peeling, deformation, tearing, heat sealing, bonding, opening force, tearing force, low speed Unwinding force, peeling force, pulling force, and other performance tests.

(2) XLW (EC) intelligent electronic tensile testing machine complies with GB 8808-1988, GB/T 1040.1-2006 ~ GB/T 1040.4-2006, GB/T 1040.5-2008, GB/T 4850-2002, GB/T 12914 -2008, GB/T 2790 ~ GB/T 2792, QB/T 2358, ISO 37, ASTM D 3330, ASTM F 904 and other nearly 30 domestic and international standards.

4.3 Equipment Parameters

l Force sensors of 500 N and 50 N are available for selection. The test accuracy is better than 0.5, which effectively ensures the accuracy of the test results.

l The equipment supports two-way pull and pressure test mode. In both test modes, the test speed can be from 50 mm/min, 100 mm/min, 150 mm/min, 200 mm/min, 250 mm/min, 300 mm/ In any of the seven modes of min and 500 mm/min.

l Pneumatic clamping device can effectively prevent the sample from slipping.

l The stroke of the clamp is 950 mm.

l Protect user's operation safety through intelligent configuration such as limit protection, overload protection and automatic return.

l Configure more than 100 different sample holders for users to choose, which can meet the test requirements of more than 1000 kinds of materials, and provide customized services according to the different test materials.

5, test steps

(1) Cut five specimens of 100 mm diameter circular specimens from the surface of the cover film of the aluminum-plastic composite film with a sampler.

(2) After the puncture needle has been punctured by the outer surface of the sample, the sample is clamped to the special fixture for the puncture test. The outer surface of the sample faces the direction of the puncture needle and the fixture is fixed on the test equipment.

(3) Set test information such as test speed, displacement, and sample thickness for holding the puncture needle holder.

(4) Click on the Start Test option to start the test.

(5) The instrument automatically calculates, analyzes and presents test results.

6, test results

The puncture resistance of the five cover film samples tested was 6.928, 7.125, 7.088, 7.216, and 6.994, respectively. The relative deviation between the results of each sample was less than 5%. According to the needs of the actual cover film during use, the value of the puncture resistance is more appropriate, which can not only meet the ease of insertion of the straw when eating, but also ensure that the cover film is not easily punctured by the external hard object to break or leak.

7. Conclusion

Using XLW (EC) intelligent electronic tensile testing machine (Labthink) to test the anti-piercing force of aluminum foil composite film cover film, you can obtain stable and accurate test results, and provide a reliable verification program for the relevant indicators of the actual use of yogurt cup products. The puncture resistance instrument and test method involved in this program can also be applied to the puncture resistance verification of other soft plastic composite film products. Labthink has been committed to providing professional testing services and equipment for customers around the world. Over the years, it has provided thousands of relevant puncture-proof verification services for customers around the world, providing customers with reliable data support. For more information about related testing equipment, you can log in to view specific information or to inquire. Labthink expects to enhance the technical exchanges and cooperation with enterprises and institutions in the industry.