Abstract : The fastness of the ink layer of the soft plastic packaging using the surface printing process on the surface of the packaging bag is an important factor related to whether the writing and the pattern are easy to fall off. By detecting binding to a fastness frozen surface ink film packaging, testing methodology for verifying the printing quality of the packaging, and testing process, Labthink blue light BLJ-02 disc peel test machine and YGJ-02 gel A simple description of the test equipment such as adhesive tape roller presses provides a reference for companies to examine the printing effect of packaging materials.

Keywords : surface printing, soft plastic packaging, ink bond fastness, disc peel tester, adhesive tape press roller, single layer film, ink layer shedding

1 , the meaning

The common soft plastic bags include single-layer films and composite films. The printing methods include surface printing and in-print printing. For single-layer film-type flexible plastic packaging, the quality of printing is particularly important, because the printing layer of a single-layer film is usually exposed to the outside, subject to the influence of the external environment, if the combination of printing ink on the film surface If the fastness is poor, the ink layer is easily worn or detached when rubbed or rubbed by external force during the transportation and sales of the finished product packaging, which not only reduces the image of the packaged product in the eyes of consumers, but also may cause Loss of important information such as production date, shelf life, preservation method, etc., inconveniences the purchase or use process of consumers. Therefore, improving the binding fastness of the printing ink on the packaging surface and strengthening the detection of the binding fastness of the printing layer on the surface of the film-like packaging material layer is an important measure to prevent the ink layer from grinding and falling off.

Figure 1 Common surface printing soft plastic packaging

2. Test basis

The ink layer binding fastness test may refer to the relevant provisions in 5.7 of GB/T 7707-2008 " Intaglio Decorative Print" .

3 , test sample

A single layer of soft plastic bags for frozen food packaging.

4 , testing equipment

In this paper, the BLJ-02 disc peel tester and YGJ-02 adhesive tape press roller independently developed by Jinan Languang Electromechanical Technology Co., Ltd. were used to test the ink layer fastness of the samples.

Figure 2 BLJ-02 disc peel tester

Figure 3 YGJ-02 Adhesive Tape Roller

4.1 Test principle

The basic principle of this test is to glue the adhesive tape that meets the requirements to the ink printing surface of the sample, and roll the adhesive tape and the sample that are pasted together with the standard load, the number of rolling times and the rolling speed, After a certain period of time, the sample and the adhesive tape were peeled off under a certain pressure, and the peeling of the ink layer on the surface of the sample was observed, and the fastness of the printed layer of the sample was analyzed.

4.2 Scope of application

(1) The testing equipment mentioned in this paper can be used for the testing of the ink layer binding fastness of plastic film prints, cellophane prints, etc., but it can also be used for aluminum plating of materials such as vacuum aluminized films and coated films. Coating layer adhesion state test.

(2) The testing equipment involved in this article conforms to a number of national and international standards such as GB/T 7707 , JIS C2107 , JIS Z0237 , etc.

4.3 Equipment Parameters

(1) BLJ-02 Disc Peel Tester

(2) YGJ-02 Adhesive Roller

5 , the test process

(1) Stick the adhesive tape on the printed surface of the sample to be tested.

(2) Place the above sample on a tape roll machine and roll it back and forth three times and let it stand for 10 minutes .

(3) One end of the specimen is clamped on the A plate ( large diameter plate ) , and the out tape is fixed on the B plate.

(4) Start the disc peel tester. The A disc is peeled off at a speed of 0.8 m/s .

(5) Remove the sample, cover the tested part of the sample with semi-transparent mm-grid paper, and count the number of cells A1 occupied by the ink layer and the number of cells A2 occupied by the ink layer at the drop-off .

(6) Calculate the ink layer binding fastness [A1/(A1+A2)] .

6 , test results

The ink layer of the sample was peeled off, and the tested ink layer had a combined fastness of 96% .

7. Conclusion

The fastness of the ink layer is a physical index that characterizes whether the ink layer is apt to fall off, and is an important performance index for evaluating the printing quality of a printed product. Combined use of Labthink BLJ-02 disc peel test machine YGJ-02 and the tape pressure roller machine, print ink can be detected in good fastness, and the test process is simple, accurate test results, and reliable. Labthink has always been committed to providing professional packaging inspection equipment and testing services to customers around the world. The packaging performance involved includes barrier properties, flexibility, impact resistance, puncture resistance, heat sealing performance, sealing performance, solvent residue, and evaporation. Residues, etc., related equipment information and service content You can visit the website of Jinan Languang Company to check or call directly for consultation. The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to take this opportunity to increase technical exchanges and cooperation with enterprises and institutions in the industry.

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