Abstract: Composite fastness is an important performance index of composite membrane materials, which has a close impact on its performance. There are many factors affecting the composite fastness. This paper compares and analyzes the effect of different color inks on the composite fastness of the plastic composite film with different color ink printing parts, and passes the test principle and equipment XLW (EC). The introduction of intelligent electronic tensile testing machine parameters and scope of application, testing process, etc., provides a reference for enterprises to monitor and analyze the composite fastness of composite film packaging materials.
Key words: composite fastness, peel strength, printing ink, plastic composite film, intelligent electronic tensile testing machine, composite film material
1 , meaning
The composite film material is a combination of single-layer films of different materials by an adhesive to fully exert the excellent performance of each single-layer film, and meet the quality requirements of the packaged products. Taking the aluminum-plastic composite film PET/Al/PE material as an example, the three single-layer film materials play different roles in the composite film. The PET film acts as a printing layer, Al mainly acts as a barrier, and the PE film is a heat-sealing layer. Since the Al surface is prone to defects such as creases and pinholes, the PET and PE films also protect the Al layer. If the composite fastness between the layers is low and the layering is easy, the protective effect of the plastic film layer on the aluminum foil layer is weakened. When pressed and twisted, the aluminum foil is easily destroyed, which affects the overall barrier of the composite film material. Performance, in addition, low composite fastness will also affect the overall impact resistance and puncture resistance of the package. Therefore, the appropriate composite fastness is a prerequisite for ensuring that the performance of the composite membrane material can reach the expected value.
There are many factors affecting the composite fastness of composite membrane materials, such as the type of adhesive, the distribution ratio of each group, the amount of glue, the composite process parameters, ink, etc. This paper focuses on the comparative analysis of the effects of different color inks on the composite fastness.
Figure 1 various types of composite membrane materials
2 , test basis
The composite fastness is generally characterized by the peel strength. This paper tests the peel strength of the sample according to GB 8808-1988 "Soft Composite Plastic Material Peel Test Method".
3 , test samples
In this test, a plastic composite film composed of two layers of film was selected as a test sample, and the surface of the sample contained three different color ink printing areas.
4 , test equipment
In this paper , the peel strength of the sample is tested by XLW (EC) intelligent electronic tensile testing machine. The equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 XLW (EC) intelligent electronic tensile testing machine
4.1 Test principle
In this paper, the effect of different inks on the composite fastness of samples was analyzed by comparing the peel strength of different color printing areas on the sample surface. The force value required to separate the composite layers of the unit width sample is the peeling strength. During the test, the upper and lower clamps of the device respectively hold the two ends of the sample stripping portion, and the upper clamp moves upward to pull the sample for peeling. The force value and the displacement change generated by the peeling process are monitored in real time by the force value sensor and the displacement sensor configured by the upper clamp, thereby obtaining the peel strength of the sample.
4.2 Equipment parameters
Available in 500 N and 50 N specifications, the test accuracy is better than 0.5 , which effectively guarantees the accuracy of the test results; supports the pull and press bidirectional test mode, in both test modes, the test speed can be Any of the seven modes of 50 mm/min , 100 mm/min , 150 mm/min , 200 mm/min , 250 mm/min , 300 mm/min , 500 mm/min ; pneumatic clamps can effectively prevent The sample slips; the stroke of the clamp is 950 mm ; the intelligent configuration such as limit protection, overload protection and automatic return is used to protect the user's operation safety; more than 100 different sample holders are available for users to choose, which can meet more than 1000 The testing requirements of the materials, and can provide customized services according to the test materials.
4.3 Scope of application
(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, Stripping, stretching, deformation, tearing, heat sealing, bonding, puncture force, opening force, tearing force, low speed solution of composite cover, metal foil, separator, back sheet material, non-woven fabric, rubber, paper, etc. Testing of properties such as rolling force, peeling force, and drawing force.
(2) XLW (EC) intelligent electronic tensile testing machine meets GB 8808 , GB/T 1040.1 ~ GB/T 1040.4 , GB/T 1040.5 , GB/T 4850 , GB/T 12914 , GB/T 2790 ~ GB/T 2792 Nearly 30 domestic and international standards , such as QB/T 2358 , ISO 37 , ASTM D 3330 , and ASTM F 904 .
5 , the test process
(1) Cut the samples in the same direction, and cut 5 samples each with a width of 15.0 mm and a length of at least 10 cm from different colors on the surface of the sample .
(2) Condition adjustment The cut sample was placed in an environment of 23 ± 2 ° C and 45% ~ 55% for 4 h .
(3) Pre-peeling Manually pre-peeling about 3 cm from one end of each sample .
(4) Setting parameters In the control software of the test equipment, the equipment test speed (300 mm/min) , sample width, sample name and other parameter information.
(5) wherein the gripper to take a sample of the pre-peeled peeled portion are two layers of material on the clamping device, the fixture, the central longitudinal axis of the stripped portion of two overlapped clip connection, clicking For the test option, the upper clamp moves upward at the set speed and the specimen is peeled off.
(6) After the end of the test, the device displays the measured peel strength value. Repeat this operation until all samples have been tested.
6 , test results
The peeling strength of the samples measured in different color regions in this test was taken as the average value of the test results of five samples in each region. The peeling strength of the unprinted region, that is, the transparent region was 1.036 N/15 mm , and the peeling of the white printed region. The strength was 0.887 N/15 mm and the peel strength of the yellow printed area was 0.571 N/15 mm .
7 , conclusion
The printing process, ink quality and compatibility with the adhesive will affect the composite fastness in the printed area of ​​the composite film material. This test tested the peel strength in different color areas of the plastic composite film sample. The test operation is simple, the equipment is highly intelligent, and the force value during the test can be clearly and intuitively displayed. The test result shows that the composite fastness of the unprinted area is good, followed by the white printed area and the yellow printed area. This phenomenon may be related to the different compatibility of different color inks and adhesives. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging testing services for packaging inspection equipment. It can provide a full range of testing equipment and services for packaging material performance research and quality control . The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.
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