Anti-puncture verification scheme for yoghurt plastic cup sealing aluminum foil cover film

Abstract: Most of the yoghurt cup cover film is made of aluminum foil composite film, mainly to ensure the high barrier of the seal, and to meet the easy puncture of the straw. However, if the cover film is too easy to puncture, the force of the external hard object will not be tolerated, and quality problems such as leakage and breakage may occur. Therefore, how to ensure that the puncture resistance of the cover film is more suitable, then professional puncture resistance testing equipment and reasonable detection methods are needed for verification. This paper introduces in detail the test principle, method and test procedure of the puncture proof verification test, which can provide practical reference for related industries.

Key words: yogurt plastic cup, sealing cover film, leakage, cracking, aluminum foil composite film, aluminum-plastic composite film, soft plastic packaging, puncture resistance, puncture resistance, puncture strength, intelligent electronic tensile testing machine

1, meaning

Puncture resistance is an important indicator of soft plastic film performance, that is, the performance of packaging materials against external force puncture, and its performance is characterized by "puncture resistance" or "puncture strength". In the packaging, storage, transportation and circulation of finished products packaged with soft plastic film, it is easy to be subjected to sharp objects inside the package (such as bamboo sticks, wooden sticks, bones, seasoning granules and corners of quick-frozen dumplings) or outside. Punctures, impacts, etc. of sharp objects that are often in contact (such as the hard corners of other bags). If the puncture resistance of the packaging material is poor, that is, the puncture resistance or the puncture strength is low, it may cause small pinhole-like holes on the surface of the package, resulting in leakage or leakage of the finished package, or even obvious bag breakage, thereby making the interior Quality problems such as deterioration and leakage.

Plastic cup yogurt packaging often uses a film made of metal such as aluminum foil as a cup cover film, that is, a composite film formed of aluminum foil and other plastic films. Because yoghurt contains a lot of fat and protein components, the packaging material is required to have high oxygen barrier property, and the cover film of this material has high barrier property, which can ensure the excellent oxygen barrier property of the yoghurt cup; at the same time, it is easy to be puncture by the straw It is convenient for the consumer to suck, but it does not mean that the puncture resistance of the cover film is as small as possible (that is, the cover film is easy to pierce), and it is necessary to satisfy a certain puncture resistance and prevent accidental damage caused by external objects. This article takes a cover film of a brand of yogurt plastic cup aluminum foil composite film as an example, and uses the XLW (EC) intelligent electronic tensile testing machine independently developed by Jinan Languang to carry out relevant puncture resistance test.

Figure 1 yogurt cup and its cover film

2, standard

The domestic test method for the puncture resistance of soft plastic packaging is mainly based on the "6.6.13 Puncture Strength" part of GB/T 10004-2008 "Plastic composite film for packaging, bag dry composite, extrusion compounding".

3, test samples

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

4, testing equipment

In this paper, the Labthink Languang XLW (EC) intelligent electronic tensile testing machine is used to test the puncture resistance of the sample.

Figure

2 XLW (EC) intelligent electronic tensile testing machine

4.1 Test principle

According to the actual puncture direction, it is determined which side of the inner and outer surfaces of the sample faces the puncture needle, and then the sample is clamped by a special jig. The puncture needle mounted on the moving collet will move at a certain rate until the puncture sample, and the force value sensor and displacement sensor on the moving collet will accurately record the change in force value throughout the puncture.

4.2 Applicable scope of equipment

(1) XLW (EC) intelligent electronic tensile testing machine is suitable for plastic film, composite materials, flexible packaging materials, plastic hoses, adhesives, adhesive tapes, stickers, medical patches, release paper, protective film, Puncture resistance, stretching, peeling, deformation, tearing, heat sealing, adhesion, opening force, tearing force, low speed of composite cover, metal foil, diaphragm, back sheet material, non-woven fabric, rubber, paper, etc. Tests for properties such as unwinding force, peeling force, and drawing force.

(2) XLW (EC) intelligent electronic tensile testing machine meets 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

The l500 N and 50 N force values ​​are available for selection, and the test accuracy is better than 0.5, which effectively guarantees the accuracy of the test results.

l The equipment supports the pull and press bidirectional 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/ Min, 500 mm / min arbitrarily set in seven modes.

l The equipment adopts a pneumatic clamp to prevent the sample from slipping.

l The stroke of the clamp is 950 mm.

l Protects the user's operation security through intelligent configuration such as limit protection, overload protection, and automatic return.

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

5, the test steps

(1) Five pieces of a circular sample having a diameter of 100 mm were cut from the surface of the aluminum-plastic composite film cover film by a sampler.

(2) After confirming that the puncture needle is puncture inward from the outer surface of the sample, the sample is clamped to the special jig for puncture test, the outer surface of the sample faces the direction of the puncture needle, and the clamp is fixed on the test equipment.

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

(4) Click the Start Test option and the test begins.

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

Figure

3 sample clamping process

6, test results

The puncture resistances of the five covered film samples tested were: 6.928, 7.105, 7.088, 7.216, 6.994, and 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 puncture resistance value is suitable, which can not only facilitate the insertion of the straw when eating, but also ensure that the cover film is not easily punctured or ruptured by external hard objects.

7. Conclusion

The XLW (EC) intelligent electronic tensile testing machine (Labthink) is used to test the puncture resistance of the aluminum foil composite film cover film, and stable and accurate test results can be obtained, which provides a reliable verification scheme for the relevant indicators of the actual use of the yogurt cup product. The anti-puncture force instrument and test method involved in the program can also be applied to the puncture proof verification of other soft plastic composite film products. Labthink has been committed to providing professional testing services and equipment to customers around the world. Over the years, it has provided thousands of relevant anti-puncture verification services to customers around the world, providing reliable data support for customers. Learn more about the relevant testing instruments, you can login

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Copyright statement: Article Copyright Jinan Languang Electromechanical Technology Co., Ltd., reprinted without permission!