Analysis of the detection technology of the hottes

Analysis of detection technology of flexible packaging composite film (Part 2)

detection of surface tension of composite film now in order to ensure the quality of products, it is necessary to detect the surface tension of composite film. Surface tension is the degree of corona treatment, expressed in dyne or dye/m3. Materials such as flexible packaging polyethylene and polypropylene are non-polar materials, and their surface is dense and smooth, which is very inert. Without surface treatment, it is difficult for the adhesive to penetrate and moisten it, and it is difficult to bond with polytetrafluoroethylene. In order to improve this phenomenon, corona treatment is adopted, and corona treatment is adopted for all flexible packages

standard: BOPP (CPP) 38 dyne, pet (polyester) 44 dyne, PE (polyethylene) 38 dyne, NY (nylon) 52 dyne; Corresponding surface tension testing pens: 38, 40, 41, 44, 48/Mn/m. you can prepare your own without surface tension pens. See Table 1

testing methods: Corona pen testing method, BOPP transparent tape testing method, ink testing method

1. mark the corona pen on the surface of the tested substrate and observe the mark of the marking. If the scribing is continuous, not broken and not shrunk, it means that it meets the composite requirements. On the contrary, if there is fracture and shrinkage, it means that the treatment length is not enough and it needs to be treated. It should be noted that what kind of corona pen you choose represents what kind of value. For example, marking with 38 - no shrinkage means there is 38 dyne, and the same method is used for the prepared liquid

2. BOPP transparent tape can also be tested. Peel the BOPP transparent tape close to the tested film surface. Generally, if the corona treatment value meets the requirements, it will be very tight and difficult to peel; On the contrary, if the treatment does not meet the requirements, it is easy to peel off

3. tension can also be detected by using ink coating. Place the tested film surface flat, apply chlorinated ink to the surface, and stick it tightly with BOPP tape after drying. If the ink is easily peeled off, only strength: flat sling 1T ⑶ 0t round sling 1T ⑶ 00t indicates that the surface tension does not meet the requirements. On the contrary, peeling difficulty indicates that the tension meets the requirements,

181 degree peeling strength test, heat sealing strength test, tensile strength and deformation test

it is necessary to carry out peeling strength test, heat sealing strength test, tensile strength and deformation test for soft packaging. Now, with the higher and higher requirements of packaging, the strength directly affects the quality of our products. Customers are not only concerned about the solution of the problem, but also pay more attention to the actual peel strength and other requirements of the product. Next, the peel strength test, hot cutting strength test, tensile strength and deformation test concerned in China are analyzed

peel strength: the peeling of flexible packaging refers to the process of using an additional instrument for the product to be tested under certain conditions. The strength is the standard, and the strength is generally expressed in N. the width of the stripped physical object is generally specified as 15mm for flexible packaging, so the overall unit of expression of peel strength should be n/15mm. The heat sealing strength and peel strength are expressed in the same way. The difference is that the heat sealing strength should detect the sewn object at a certain temperature. The heat sealing strength detection of flexible packaging is one kind of performance

tensile secondary deformation rate: it is mainly tested for the base material, but the difference is that generally there is no composite product to be tested. If the two stripping inspection methods in China are to install the finished shoes on the retro film on the shoe last, the last measurement of tensile strength cannot be continued, so the detection should be targeted

180 degree peel strength test is carried out according to gb8808 standard. Heat seal strength test basis (GB/t2358-98 standard is implemented. The detection of tensile strength and deformation is carried out according to the gbl30 detection precision durable preferred machine Jinan new era Gold Testing Instrument Co., Ltd. 22 standard,

examples. Experimental conditions: Jinan Languang intelligent electronic tensile machine; design standard: National GBL implementation and manufacturing; technical indicators are shown in Table 2; location of test conditions: Zhongshan Kanghe quantitative research laboratory. Base material: PET/CPP; sample width: 15mm; length: 20c M； Composite adhesive: kh-d603/kit-1603; Maturation time: 4 hours, but opportunities and challenges coexist x hours; Ripening temperature: 50%: test form: T-Peel; Test speed: 300mm/min: style number: kh-30008 ambient temperature and humidity: 23/60%

detection method: clamp the cut width of 15mm, both ends of the composite film on the fixed clip, and then move the words of experiment on the interface for detection, and record the average value measured. - Generally, the heat sealing strength and peel strength shall be tested for less than three times and the average value shall prevail. Generally, it can be analyzed according to the measured peeling phenomenon, so the phenomenon should be recorded and the measured results should be applied to the table of design. At present, computer facilities are configured for testing experiments. After testing, the data will be printed out in the form of coordinates

precautions: no matter any composite structure is tested, the machinery must be cleaned after testing

(author/chenquandong)

source: flexible packaging weekly