Application Article-Copper Clad Laminate Peel Test

 1.90 ° peeling test of copper clad laminate

This paper introduces an example of 90 peel test of copper clad laminate using Kunpeng BOYI 2025 electronic universal material testing machine, 500N pneumatic double push tensile clamp and 90 peel clamp according to section 2.4.8-peel strength of metal foil clad laminate in IPC-TM-650 test method manual. the adhesive strength between copper clad laminate and substrate is characterized by peel strength. the test results show that, the use of Kunpeng BOYI 2025 electronic universal material testing machine can completely correspond to the 90 ° peel test of copper clad laminate.

Keywords: Kunpeng BOYI 2025 electronic universal testing machine copper clad laminate 90 ° peeling test

Copper Clad Laminate (Copper Clad Laminate, referred to as "CCL") is an electronic glass fiber cloth or other reinforced materials impregnated with resin, one or both sides coated with copper foil and hot pressed to make a plate material, CCL is an important basic material of PCB. With the development of electronic information industry, copper clad laminate technology has been widely used with the development of PCB technology. One of the important technical indexes of copper clad laminate is the adhesion strength of copper clad layer. The higher the adhesion strength of copper clad layer, the more stable the connection between copper clad layer and substrate, and the less prone to peeling or falling off. The adhesion strength is characterized by peeling strength. This application introduces the 90 ° peeling strength test of copper clad laminate. 
The pneumatic double-push stretching fixture and 90 peeling fixture equipped with Kunpeng testing machine can realize rapid positioning and clamping of the sample before the test and return and replacement after the test, thus improving the operation convenience, improving the testing efficiency and greatly saving the testing time. In addition, during the peeling test, thanks to the high-precision slide rail and synchronization device of the special 90 peeling fixture, the axial angle between the plate and the testing machine is always kept at 90, ensure that the test process meets the standard requirements; In addition to the fixture, the high precision of the main machine of the testing machine and the acquisition frequency of more than 1000HZ can completely record all the characteristic data in the stripping process, provide accurate and reliable test data for users, and cooperate with intelligent test software to provide various test curves such as single sample, multiple samples, double coordinates, etc. at the same time, so that different users can have good interactive experience, for the enterprise's research and development, quality and product control escort.

1. Experimental part

1.1 instruments and fixtures

BOYI 2025-001 electronic universal testing machine

500N pneumatic double push stretching fixture

90 ° stripping fixture

Smartest software

1.2 analysis conditions

Test temperature: room temperature about 25 ℃

Load sensor: 1000N(0.5 level)

Loading test rate: 50.8 mm/min

1.3 samples and processing

In this test, a sample with a fixed bonding width of 3.18mm is selected, and the surface of the copper foil is reinforced with a special tape. Peel the sample for a certain distance in advance. The peeling end shall ensure that the copper foil and the adhesive tape are well adhered to avoid splitting or edge damage, and no fracture occurs during the peeling process. At the same time, the peeling end shall be long enough to be fully clamped by the upper clamp. The peeling test requires that the clamping end of the tester clamp shall always be peeled within an angle of 90±5 ° with the substrate.

2. Test Introduction

Use BOYI 2025-001 electronic universal testing machine to carry out the test. Install the sample on the 90 ° peeling fixture. The copper foil is clamped in the upper fixture and the substrate is clamped in the lower fixture. The two are in a 90 ° peeling state, as shown below (Figure 1). The test was carried out at a rate of 50.8 mm/min. Measure the force and displacement data during the peel, take the average peel force during the low peel force peel state, obtain the peel force and peel strength data (Table 1), and generate the peel curve (Figures 2-3).

Fig. 1 Test System (Host, Fixture)

3. Results and Conclusions

3.1 test results

After the test, the load-displacement curve of the 90 ° peeling test of the sample is shown in (Figure 2~3). During the peeling process, the slight force value fluctuation signal is captured by the host to form a stable peeling curve. Using the test software, the data such as load and displacement can be obtained on the curve, and the average peeling strength can be obtained. The specific test results are as follows (Table 1).

Transverse

Vertical

Fig. 2 90 ° peeling curve (multiple samples)

Fig. 3 90 ° peeling curve (single sample)

Fig. 4 Sample Peeling State

It can be seen from the above (Table 1) data and the sample state after stripping that during the whole test process, the sample stripping state is stable, the fluctuation is very small, and there is no abnormal stripping phenomenon. The average values of the results of 5 samples in each of the two groups are very close, and the difference between the maximum value and the minimum value is within 0.1N/mm. From the test results can reflect the Kunpeng BOYI 2025-001 electronic universal testing machine of high precision and high stability.

4. Conclusion

To sum up, Kunpeng BOYI 2025-001 electronic universal testing machine, 500N pneumatic double-push stretching fixture and 90 peeling fixture can fully meet the requirements of section 2.4.8-peeling strength standard of metal foil clad plate in the manual of IPC-TM-650 test methods, and complete the test with high efficiency and high quality. Through the high-precision and high-sampling rate test system, various mechanical data of copper clad laminate can be obtained, and it is stable and reliable, which is very important for the technological development of copper clad laminate and PCB industry, and can provide data support and technical support for product development, quality management, and standardization and standardization of the industry.