summaryDuck neck is a common flavored snack that is delicious and loved by consumers. In the circulation process of finished duck neck packaging, quality problems such as bag swelling and air leakage often occur, which brings unpleasant consumption experience to consumers. And similar quality problems with duck necks are often caused by poor barrier properties of packaging materials. This article adopts the independently developed technology of Jinan Languang Electromechanical Technology Co., LtdC230HOxygen permeability testing systemC681MTwo testing devices, namely the rubbing tester, were used to verify the barrier properties of duck neck aluminum-plastic composite packaging bags, and the principles, parameters, and operating processes of the devices were explained. This has certain reference and guidance significance for controlling the barrier properties of aluminum-plastic composite films.

keywordsDuck neck, meat products, oxygen permeability, oxygen barrier, aluminum-plastic composite film, aluminum plated composite film, kneading properties, pinholes

1Meaning

Duck neck is a high protein, low-fat food that has the effects of nourishing qi, tonifying deficiency, and beautifying appearance. It is fresh, fragrant, and beautiful, and is a leisure food suitable for all ages. The rich nutritional content of duck necks also imposes strict requirements on the barrier properties of packaging materials. If the oxygen barrier properties of packaging materials are low and the oxygen permeability is high, the duck necks in the packaging will come into contact with a large amount of oxygen, which can easily lead to quality problems such as mold, bag swelling, and odor.

At present, most common duck necks are packaged with aluminum-plastic composite film. For packaging materials containing aluminum foil, the aluminum foil material has the characteristic of not being resistant to rubbing, which is prone to defects such as creases and pinholes under external force, causing a decrease in barrier properties. Therefore, for the oxygen barrier properties of aluminum-plastic composite film and aluminum plated plastic composite film materials, attention should not only be paid to their oxygen permeability before rubbing, but also to their oxygen permeability after rubbing.

image1 Duck neck aluminum-plastic composite packaging bag

2Related test standards

At present, there are testing standards for oxygen permeability of flexible plastic packaging in ChinaGB/T 1038-2000Plastic films and sheets - Test method for gas permeability - Differential pressure methodGB/T 19789-2005There is currently no relevant testing standard for the rubbing test in China, and when using it domestically, reference is made to the American standard, such as the Coulombic meter detection method for oxygen permeability testing of plastic films and sheets in packaging materialsASTM F 392.

3Testing samples

A certain brand of duck neck aluminum-plastic composite film packaging bag.

4Experimental equipment

This article adopts the methods ofLabthinkLan GuangC230HOxygen permeability testing systemLabthinkLan GuangC681MThe rubbing tester is used to conduct oxygen permeability and rubbing tests on the aluminum-plastic composite film.

image2 C230HOxygen permeability testing system

image3 C681MRubbing tester

4.1 Test principle

C230HThe oxygen permeability testing system adopts the principle of isobaric testing. The pre processed sample is clamped between the testing chambers, and oxygen or air flows on one side of the film, while high-purity nitrogen flows on the other side of the film. Oxygen molecules diffuse through the film into the high-purity nitrogen on the other side, and are carried to the sensor by the flowing nitrogen. By analyzing the oxygen concentration measured by the sensor, the oxygen permeability and other results are calculated; For packaging, high-purity nitrogen flows inside the packaging, while air or oxygen surrounds the outside of the packaging.

C681MThe rubbing tester simulates the rubbing, folding, and damage behavior of packaging materials during production, processing, and transportation, and rubs the samples horizontally and vertically in all directions (separated). By detecting the changes in barrier properties or pinhole numbers before and after rubbing, the rub resistance of the material is determined.

4.2 Scope of Application

(1) C230HOxygen permeability testing system

l Container type: suitable for oxygen permeability testing of bottles, bags, cans, boxes, and barrels made of plastic, rubber, paper, paper plastic composite, glass, metal, and other materials, such as cola bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal three can pieces, plastic cosmetics packaging, dental cream hoses, jelly cups, yogurt cups, etc.

l Thin film category: suitable for oxygen permeability testing of various plastic cover films, plastic composite films, paper plastic composite films, co extruded films, aluminum plated films, aluminum foil, aluminum-plastic composite films and other film like materials.

l Sheet materials: suitable for oxygen permeability testing of various engineering plastics, rubber, building materials and other sheet materials, such asPPSheet materialsPVCSheet materialsPVDCSheet materials, etc.

l Can meet the standards:ASTM D3985TheASTM F1307TheASTM F1927(Optional)GB/T 19789TheGB/T 31354TheDIN 53380-3TheJIS K7126-2-BTheYBB 00082003-2015Waiting for multiple testing standards.

(2) C681MRubbing tester

l Thin film category: suitable for testing the anti rubbing performance of plastic films, thin sheets, and composite films, such as various composite films used in packaging, aluminum plated films, aluminum-plastic composite films, nylon films, coating films, etc.

l Paper type: suitable for testing the anti rubbing performance of paper materials.

l Standard: MeetsASTM F392.

4.3 Equipment parameters

(1) C230HOxygen permeability testing system

l The testing scope of container samples is0.00005～1cm3/(pkg·day)The resolution is0.001cm3/(m2·day)The testing range for thin film specimens is0.01～200cm3/(m2·day)(standard)The resolution is0.001cm3/(m2·day).

l Simultaneously testing3The same sample meets the standard requirements for parallel testing; Support under the same conditions3Test different samples.

l Test temperature control range10～55℃±0.2℃。

l Test humidity control range: Oxygen0，5～90%±1%，100%; Carrier gas0，5～90%±2%(Optional).

(2) C681MRubbing tester

l Rubbing frequency:45time/minute

l Experimental mode: ModeA（2700Secondary), ModeB（900Secondary), ModeC（270Secondary), ModeD（20Secondary), ModeE（20Short distance travel, modeF（0~20000Can be set arbitrarily)

l Pulling pressure:300N

l Rotating torque:2Nm

l Sample thickness: ≤2.5mm(Other thicknesses require the purchase of fixtures)

l Rubbing angle:440° or400°

l Horizontal itinerary:155 mmor80 mm

5Experimental process

5.1 Testing process of oxygen permeability before kneading

(1)sample preparation

Cut the sample from the surface of the pre treated sample using a sampler3Share.

(2)Sample clamping

Apply a layer of vacuum grease around the periphery of the test chamber, stick the sample onto the test chamber, and clamp it with a sample clamping device. As shown in the figure4As shown.

image4 Sample clamping process

(3)Sample testing

Set the test parameters, turn on the vacuum pump, and start the test. After the experiment is completed, the system automatically calculates the test results based on the measurement data.

5.2 Rubbing test process

(1)sample preparation

Cut from the surface of the sample using a sampler280 mm × 200 mmThe sample2Share.

(2)Sample clamping

Fix the sample onto the rotating shaft using a sample fixing clip. As shown in the figure5As shown.

image5 Sample fixation

(3)Sample testing

Select the appropriate kneading mode, start the experiment, and stop the experiment after completing the kneading times corresponding to the selected mode.

5.3 Testing process of oxygen permeability after kneading

according to5.1The steps in the process involve preparing a sample from the surface of the kneaded sample to test the oxygen permeability after kneading.

6Test results

The oxygen permeation rates of the aluminum-plastic composite film used for the duck neck packaging before kneading are as follows:0.1364 cm³/(m²·d)The0.1402 cm³/(m²·d)The0.1391 cm³/(m²·d), throughCpattern6minute270After the second kneading, the oxygen permeability of the sample after kneading is10.1846 cm³/(m²·d)The10.7351 cm³/(m²·d)The10.9430 cm³/(m²·d).

7Conclusion:

利用LabthinkLan GuangC230HOxygen permeability testing systemC681MThe kneading tester can accurately test the oxygen permeability of aluminum-plastic composite film before and after kneading, truly reflecting the barrier performance of the packaging material. The operation of the instrument is simple, the repeatability of test data is good, and the test efficiency is high. After kneading, the oxygen permeability of the aluminum-plastic composite film packaging material significantly increases, while the barrier properties are greatly reduced. This indicates the importance of testing the oxygen permeability before and after kneading to monitor the barrier properties of the packaging material for aluminum-plastic composite films. In addition to the barrier properties tested in this article, the duck neck aluminum-plastic composite film packaging bag also needs to pay attention to testing indicators such as heat sealing strength, puncture resistance, and sealing performance. For testing instruments related to these performance indicators, you can visitLujinan Languang Company WebsiteView or callconsulting service The more we understand, the more we trust!LabthinkLan Guang looks forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry!