Measuring and testing – Coating material: ink adhesive and/or plastic
Patent
1988-05-17
1990-01-16
Cuchlinski, Jr., William A.
Measuring and testing
Coating material: ink adhesive and/or plastic
73827, 73829, G01N 1904
Patent
active
048935034
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and an apparatus for easily measuring the adhesive-strength of an adhesive sheet to the adhered substrate, and more particularly to a compact and portable apparatus which is capable of quickly and easily measuring adhesive-strength.
BACKGROUND ART
Conventionally, a variety of tests are carried out against adhesive sheets for checking adhesive-strength, retention strength, tacking strength, or the like. Adhesive characteristic being one of such test items is represented by adhesive strength which is measured at the time of peeling off the adhesive sheet from a specific substrate at 180.degree. or 90.degree. of angle against the surface of the substrate adhered with the peeled portion of the adhesive sheet. For example, adhesive-strength at the time of peeling off the adhesive sheet from the adhered substrate at right angles denotes the strength of inhibiting the adhesive sheet from being peeled off from the surface of the adhered substrate in the vertical direction.
Based on JIS (Japan Industrial Standard), the adhesive-strength is calculated from load which is applied at the time of peeling off the adhesive sheet from the adhered substrate at a constant speed. However, since any of those conventional adhesive-strength measuring apparatuses securely fixes the substrate itself adhered with adhesive sheet onto the surface of the apparatus to hold the tip end of the adhesive sheet to be peeled off from the adhered substrate, the adhesive-strength measuring apparatus is provided with large dimensions and weight to result in the inconvenience for carrying it to a specific location.
Concretely, when measuring the adhesive strength at the time of peeling off the adhesive sheet from the substrate at right angles, since the peeling position shifts as the peeling operation goes on, either the substrate fixed part, or the mechanism of the apparatus which pulls the adhesive sheet from the substrate should precisely and delicately be moved to prevent the peeling angle from varying. However, in order to correctly move them in accordance with the predetermined peeling speed, any of these conventional measuring apparatuses is compulsorily provided with a complex and large constitution.
This in turn causes much inconvenience to an operator to carry the large and heavy measuring apparatus to and from the designated location. In addition, since the operator needs to carry the substrate adhered with adhesive sheet to the apparatus-installed position for setting it to the apparatus, the operator cannot immediately measure the adhesive-strength of the adhesive sheet adhered to an optional substrate as required.
DISCLOSURE OF INVENTION
The primary object of the invention is to overcome the above-mentioned problem by providing a compact and portable apparatus which is capable of adhering an adhesive sheet to a preselected substrate and then quickly measuring the adhesive-strength on the spot.
Another object of the invention is to provide a novel apparatus which is applicable to either 90.degree. peeling or 180.degree. -peeling operation and capable of maintaining the peeling speed and angle constant independent of the flatness and curvature of the surface of the substrate adhered with adhesive sheet so that the apparatus itself can precisely measure the adhesive-strength.
The invention provides a method of measuring the adhesive-strength of adhesive sheets comprising the steps of:
keeping the surface of a substrate adhered with an adhesive sheet except for at least its tip portion in a fixed relative position against the pickup roller by means of an auxiliary roller;
securing the free end portion of either the adhesive sheet or a lead-in tape leading the adhesive sheet to engaging means provided on the above pickup roller;
setting the adhesive-sheet peeling angle against the surface of the substrate to the predetermined angle;
peeling off the adhesive sheet from the substrate and winding it onto the pickup roller by rotating the pickup roller at a constant speed whil
REFERENCES:
patent: 2834205 (1958-05-01), Pickup
patent: 3019644 (1962-02-01), Mancini
patent: 3394588 (1968-07-01), Mohle et al.
patent: 3412606 (1968-11-01), Cooper et al.
patent: 3524345 (1970-08-01), Isaacson
patent: 4294111 (1981-10-01), Rutledge et al.
"Peel Resistance Accurately Measured", Materials Research & Standard (NASA Tech Brief B65-10173), p. 435 (Aug. 1965).
Schweiger, R. L., "How a Release and Adhesion Tester was Developed for Pressure-Sensitive Labels", Adhesives Age, vol. 13, No. 5, pp. 34-36, (May 1970).
Herrman, R. C. and Dunn H. F., "Determining the Peel Strength of Adhesive Bonds Between Flexible Materials, Materials Research and Standards," vol. 10, No. 12 p. 27 (Dec. 1970).
Kimura Akira
Tomita Osamu
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Kanzaki Paper Manufacturing Co.
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