With the development of our Versatile Peel Analyzer VPA series, measurements, once impossible or hardly achieved with conventional tensile strength testers, have finally become possible. When equipped with our low force load cell with a full scale rated capacity of only 0.1 N, even minuscule peel strengths as low as 0.001 N can be measured and easily compared.
The most remarkable feature of our Versatile Peel Analyzer VPA series is that the peel behavior of composite materials, such as packaging materials, laminated materials, laminated films, coating films, ceramic green sheets, etc., can be evaluated under freely adjustable peel angles from 0 to 180 º using Kyowa’s unique proprietary 'Flat Plate Cross Stage Method' and self-developed analysis software.
While the standard VPA-H200 model and the compact-sized VPA-H100 model share the same functions and features, the VPA-H200's sample stage, with a length of 200 mm, allows for an effective peel distance twice that of the VPA-H100. The sample stage's maximum speed of 30.000 mm/min allows for a peel rate 2.5 times higher than that of the VPA-H100.

Pressure-sensitive adhesive tapes, or PSA tapes, play significant roles as constitutive and integral parts of production processes in various forefront industries such as flat panel displays, semiconductors, optical instruments, solar batteries, automobiles, architecture, and medical treatments.

The peel adhesion, shear resistance, and tack tests characterize the performance of PSA tapes. The widespread peel adhesion test delivers an objective appraisal with quantitative evaluation following international standards ISO 8510-1 and 2, the 90 º peel test, and the 180 º peel test. The 180 º peel test tends to be affected slightly by the thickness and elasticity of PSA tape, and the 90 º peel test may experience elongation and sagging of PSA tape due to the somewhat complicated structure of the jigs.

Demands on peel adhesion, peel angle, and peel rate for optimizing adhesive tapes used in production processes vary widely depending on the applications.

Peel angles can be changed quickly and easily without extra jigs or tools within a few seconds. To change the peel angle, loosen the locking screw of the rotary table, adjust the desired peel angle according to the affixed angular scale, and tighten again the locking screw. That's how simple it is!

The graph shows an adhesive tape's typical peel strength curve depending on peel angles. At a peel angle of 30 º, the peel strength has its highest value, decreasing gradually with higher peel angles up to about 120 º. A turning point can be seen here, from which the peel strength slightly increases gradually with higher angles.