Joining of the carton carton The box carton of the corrugated carton generally includes three modes: adhesive bonding, tape bonding, and box binding. In foreign countries, adhesive bonding and tape bonding are mainly used for single corrugated cardboard, and the box is mainly used for double corrugated cardboard and three corrugated cardboard; domestic adhesive bonding and box bonding are most commonly used in China. The three bonding methods are shown in the following diagrams 1 to 3: 2. Problems encountered in the actual testing process However, in the actual production process, it is easier to perform the detection of the box joint according to the GB/T 6543-2008 standard, and the quality of the test results is not much different from the actual one. However, for the joints with adhesive joints, the quality of the box joints is only assessed in accordance with the standards for the detection of the width of the joint tongues and the destruction ratio of the adhesive surface at the time of peeling. As a result, the test results are usually acceptable, but the joint burst occurs during use. Happening. 3. According to domestic conditions, the detection methods of domestic bonding strength can be summarized as follows: Tensile testing machine testing method; b) Compression testing machine testing method; c) Circulation in practicality testing method; d) Dropping test method. Among them, the practical test and drop test in circulation have certain practicality, but only qualitative analysis can be performed, and their strength values ​​cannot be determined. If you need to determine the specific strength data, you must use the tension and compression test method. This is also a more experimental method used by domestic users. The specimens were tested on a pressure tester and a tensile tester after constant temperature and humidity treatment. 4. Detection methods for foreign joint strength At present, there is no ISO international standard for the detection method of box joint strength. There are mainly two methods: the compression tester test method and the tensile tester test method. The compression test method adopts ASTM D642, and the tensile tester test method adopts the standard TAPPI T813. Here, the pulldown tester test method is mainly introduced. This method uses a constant speed drawing method to detect the strength of the box joint and is suitable for adhesive bonding, tape bonding and box bonding. The sample corrugated carton shall be placed in a standard atmosphere at a temperature of 23°C and a relative humidity of 50% for 24 hours. Then take 5 intact corrugated cartons, one for each corrugated box. The sampling position is shown in Figure 4. Take five test samples, each sample length at least 200mm, the length direction to include the joints, the joint is preferably in the middle of the length direction, the general adhesive bonding and tape bonding sampling width of 25mm, box binding shall include 1 nail, nails at least 6mm from the sample edge. W is the width of the sample, expressed in mm. Conclusion In the normal detection process, the strength of the box joint is often easily overlooked, but problems such as breakage or breakage of the joint, or poor adhesion will occur in batches, and the consequences will be disastrous. The production process of corrugated cartons and the factors affecting the quality of corrugated cartons are numerous and complex. Quality problems at all stages will ultimately affect the quality of cartons. Therefore, during the production process of corrugated cartons, from the beginning of design to the selection of raw materials and equipment operations And maintenance to the various processes of the production process, each link can not be ignored, the only way to ensure the quality of the carton. Plastic Container,Plastic Storage Containers,Plastic Food Containers,Plastic Container Box EVER GREEN(ZHEJIANG)NEW MATERIAL CO., LTD / KUNSHAN GREENPACK CO.,LTD , https://www.zjchangjingpack.com
u Detection of carton joint strength
1. The national standard stipulates the joint strength. At present, there are few standard methods for the jointing of corrugated boxes in China. Only the description of the joint strength of the box in the standards of GB/T 6543-2008 “Single Corrugated Boxes and Double Corrugated Boxes for Transportation Packaging†is used. : Adhesion should be firm and at least 70% of the adhesive surface is destroyed during peeling. 
Test equipment optional products enjoy PN-TT300 computer tensile testing machine, the distance between the two clips is (180 ± 5) mm, the test speed is (25 ± 5) mm/min, the time of the sample fracture is 15 ~ 30 Completed in seconds. The maximum force (N) at which each sample breaks is recorded, and then divided by the width of the sample, which is the bond strength of the box, expressed in kN/m. If more than 30 seconds, change the test speed so that it can break within 30 seconds and indicate in the report. 
