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E-mail
sales@celtec.cn
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Phone
13165113822
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Address
5577 Gongye North Road, Jinan City
Jinan Xio Electromechanical Co., Ltd
sales@celtec.cn
13165113822
5577 Gongye North Road, Jinan City
In industries such as packaging, labeling, medical dressings, and electronic die-cutting, pressure-sensitive adhesive tapepeel strengthIt is the core indicator for measuring its adhesion reliability and performance. It quantifies the force required for the tape to separate from the surface of the adhered object, directly affecting the product's adhesion, re peelability, and safety of use. Mastering scientific testing methods that comply with national standards is crucial for quality control of adhesive tape manufacturers, incoming material inspection of users, and optimization of new product development. This article will systematically explain the basisGB/T 7122-1996The principle, process, and key points of conducting 180 ° peel strength testing according to standards.
The 180 ° peel test is one of the classic and widely used methods for evaluating the performance of pressure-sensitive adhesive tapes. The test result is not only a simple force value, but also can passForce displacement curveIn depth reflection of the performance characteristics of adhesives: the smoothness of the curve reveals the uniformity of adhesion, the initial peak reflects the "fast adhesion" ability, and the fluctuation of the curve may be related to the coating process, substrate treatment, or testing environment.
This test is widely used in multiple key areas:
packaging industryEnsure that the sealing tape and labels are firmly adhered and do not loosen during transportation.
medical industryEvaluate the adhesion and gentle peel properties of medical tapes, electrode pads, band aids, etc. to the skin.
electronics industryTest the adhesive reliability of high-temperature tape, protective film, etc. during precision assembly and processing.
Material research and quality controlProvide key data support for optimizing adhesive formulations, selecting substrates, and adjusting production processes.
The principle of standard peeling test is to peel off a specified width of adhesive tape from a standard test board at a constant rate at an angle of 180 °. The average peeling force during this process is measured by high-precision sensors, and the strength per unit width is calculated, usually in N/cm or kN/m.
In China, relevant tests mainly followGB/T 7122-1996 "Test method for peel strength of pressure-sensitive adhesive tapes and adhesives"In addition, the industry often refers toGB/T 2792Standards for peel strength of pressure-sensitive adhesive tapes. In specific fields such as medical devices, it is also necessary to follow the following guidelines:YY/T 0148Waiting for stricter industry standards. These standards provide unified regulations for testing instruments, sample preparation, environmental conditions, and operating procedures, ensuring the comparability of test results.
A precise and reliable peel strength test must strictly follow every step from sample preparation to result calculation. The core process can be summarized as the following steps:
| key steps | Standard requirements and operational points |
|---|---|
| 1. Environment and sample state adjustment | Testing needs to be conducted inTemperature 23 ± 2 ℃, relative humidity 65 ± 5%Conducted in a standard laboratory environment. The adhesive tape and the adhered material should be placed under these conditionsMore than 2 hoursTo achieve balance. |
| 2. Sample preparation | Usage standardroller(Quality 2000 ± 50g), facing the sample on the back of the tape at a speed of approximately 120mm/sRoll back and forth three timesEnsure that the adhesive surface is fully and evenly adhered to the adhered object (such as stainless steel plate, PET film). For flexible adhesives such as films, a metal straightening plate should be used to fix them and maintain a 180 ° peeling angle. After bonding, it is necessary to park according to the product process requirements for a specified time (such as 20 minutes to 72 hours). |
| 3. Instrument setup and clamping | Use calibrated and qualifiedElectronic tensile testing machineSet the peeling speed to300±10 mm/minFold the unattached end of the sample back 180 °, and clamp the adhesive and the free end of the tape in the upper and lower fixtures respectively, ensuring that the peeling surface coincides with the instrument force line. |
| 4. Test execution and data collection | Start the device and continuously strip an effective length of approximately 100mm. The device software should automatically drawPeel force displacement curve. |
| 5. Result calculation and analysis | Peel strength is taken from the stable section in the middle of the curveaverage peel forceThe calculation methods includeplanimeter methodorEqual division reading method(Read at least 10 points and take the average). The final result is at leastFive valid samplesExpress the arithmetic mean of and report the maximum and minimum values. Need to recordDamage Type(Cohesive failure of adhesive layer, interface adhesion failure or transfer). |
1. Question: What are the main differences between GB/T 7122 and other peel strength testing standards (such as GB/T 2792)?
Answer: The core testing principles of these two standards (180 ° peeling method) are similar, with the main difference being the specificApplicable product scope and details of some testing parametersThe scope of GB/T 7122 is broader, covering various adhesive tapes and adhesives, while GB/T 2792 focuses more on pressure-sensitive adhesive tapes. Enterprises should prioritize selecting their own product labeling execution standards or negotiate with customers to determine them during testing. For special products such as drug packaging materials, it is necessary to followYY/T 0148Waiting for industry-specific standards.
2. Question: How should the tape sample slip or break prematurely at the fixture during testing?
Answer: This is usually related to improper selection of fixtures. Ensure the use ofSpecial peeling fixture with fine tooth patterns or special pads on the surfaceTo provide sufficient clamping force without damaging the specimen. Simultaneously check if the clamping is aligned, andEnsure that the tape and test board have been fully rolled and cured according to standard proceduresIf the strength of the tape itself is extremely low, it may be necessary to add padding at the fixture or use a softer clamping method.
3. Question: How to interpret the information of "destruction type" in the test report? What is its importance?
Answer: The type of destruction is valuable process diagnostic information.
Adhesive cohesive failureInternal separation of the adhesive layer indicates that the cohesive force of the adhesive is less than the adhesive force.
Interface adhesion failureThe separation of the adhesive layer from the test board indicates that the interface adhesion is a weak link.
Adhesive transferTransfer the adhesive layer onto the test board.
Report the type of damageHelps to determine the cause of failure, guide the improvement of adhesive formula, substrate surface treatment, or curing process.
4. Question: What equipment should be used for testing adhesive (creep resistance) tape products?
Answer: Peel strength (initial adhesion) and holding adhesion are two different tests. Adhesive testing requires the use of specializedViscosity testerThe principle is to vertically suspend a test board with adhesive tape attached, hang a specified weight at the lower end, and evaluate the ability of the tape to resist persistent shear force by measuring the displacement or detachment time after a specified time. The commonly used standard isGB/T 4851.
This document aims to provide general technical information and standard method interpretation for peel strength testing of pressure-sensitive adhesive tapes. The content is for reference only and does not constitute any operational commitment. Specific product testing, quality assessment, and business decisions must be based on current effective standard texts, instrument operation manuals, and professional judgments. If there are any updates or discussions in the information in the article, please feel free to exchange and correct them.