The texture of paper and film is thin, easy to break, and the mechanical properties fluctuate greatly, and the accuracy of the tensile test directly determines the quality judgment and process optimization. The selection of tensile testing machine is the key to ensuring accuracy, and such materials have strict requirements for equipment details. This article combines industry standards to disassemble the selection techniques to avoid errors and ensure data accuracy.
1. Clarify material properties and testing requirements
The difference between paper and film mechanics is the basis for selection: paper is brittle, small deformation, focusing on fracture and bursting strength testing; The film has high elongation and easy slippage, focusing on tensile strength and elongation testing. The conventional paper test force value is 0.1~10kN, and the film is 0.1~5kN to avoid range deviation.
2. Ensure the accuracy of testing from the equipment dimension
The selection focuses on "precision adaptation, stable blessing, and precise speed control", focusing on controlling the four dimensions, which directly determines the test accuracy.
1. Model selection: priority is given to small desktop electronic universal testing machine, servo drive high accuracy, stable loading, suitable for low force value, different deformation needs; There is no need for hydraulic models (poor stability, insufficient resolution), and 0.1~50kN models can take into account both versatility and accuracy.
2. Accuracy parameters: It needs to reach level 1 accuracy, with force value and deformation accuracy ≤± 0.5%, with an extensometer with a resolution ≥ 0.001mm, and a displacement accuracy of ≤±0.05% to ensure that the data is comparable and has no deviation.
3. Fixture selection: Follow the principle of "adapted material, anti-slip and no damage", flat clamp for paper + flannel liner, pneumatic flat clamp for film, and special narrow clamp for ultra-thin to avoid slippage and damage.
4. Speed regulation and software: speed control accuracy ≤±0.5%, paper 5~50mm/min, film 10~100mm/min; The software needs to support automatic data calculation, curve display and traceability to avoid manual errors.
3. Avoid implicit errors
Supplementary points: The equipment should have overload and limit protection, good rigidity of the fuselage, and avoid hidden errors; Selection should take into account the ease of calibration to ensure long-term accuracy.
4. Summary
The selection of paper/film material tensile testing machine should be based on material characteristics, focusing on the four core dimensions of model, accuracy, fixture, and speed regulation, and taking into account supplementary points to avoid hidden errors, in order to stably ensure the test accuracy and efficiently support product quality control and R&D upgrading.
