Peel Test Device With Rack And Pinion Synchronization

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Solution Overview

Problem

Conventional 90-degree peel tests face challenges in maintaining a consistent peel angle due to transverse movement of the test plate, leading to reduced measurement accuracy and complexity in device design.

Innovation Solution

A device with a gripping member, movable member, holding member, and conversion mechanisms that allow for linear and rotational motion to maintain a constant peel angle, using a rack and pinion system with a transmission mechanism to synchronize the motion of the test film and holding member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a 90-degree peel test is conducted by pulling the adhesive tape in a direction at an angle of 90 degrees to the test plate, then the adhesive force measurement is preferred over the 180-degree peel test, but the peel angle cannot be maintained at 90 degrees all the time due to transverse movement of the peel position on the test plate

Engineering Contradiction:

Improveadhesive force measurement accuracyVSAvoidpeel angle consistency

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The test plate is made slidable along the peel direction through a guide groove, allowing the peel position to move longitudinally while maintaining the 90-degree peel angle. This dynamic adjustment prevents transverse movement that would otherwise change the peel angle, thereby maintaining both measurement accuracy and angle consistency throughout the test process.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A guide groove structure is introduced as an intermediary mechanism between the test plate and the pulling direction. The guide groove constrains the test plate movement to the peel direction only, acting as a mediator that eliminates transverse displacement and ensures the peel angle remains consistently at 90 degrees during the entire peeling process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If a string is used to pull the test plate to move it slidingly, then the device structure is simplified, but the peel angle changes during the test due to flexure or stretch of the string, reducing measurement accuracy

Engineering Contradiction:

Improvedevice structure simplicityVSAvoidpeel angle consistency

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The string-based pulling mechanism is replaced with a rigid guide groove structure that directly constrains the test plate movement. This substitution eliminates the flexure and stretch problems inherent in string-based systems, maintaining both structural simplicity and measurement precision by using a rigid mechanical constraint instead of a flexible connector.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If the test plate slides a distance longer than the peel length due to inertial force or high-speed testing, then the test can be completed quickly, but the peel angle changes and measurement accuracy is reduced

Engineering Contradiction:

Improvetest speedVSAvoidpeel angle consistency

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The guide groove structure provides preliminary constraint on the test plate movement, preventing excessive sliding distance before the peel is complete. By pre-establishing the movement constraint, the system prevents inertial overshooting that would occur in high-speed tests, ensuring the peel angle remains at 90 degrees even during rapid testing.

Inventive Principle:

Principle #9Preliminary anti-action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables accurate and simple peel testing by maintaining a consistent peel angle, improving measurement accuracy and reducing device complexity, even at high speeds.

Implementation Method 1

a first conversion mechanism configured to convert the linear motion of the movable member to rotational power, and output the rotational power; and a second conversion mechanism configured to convert the rotational power output from the first conversion mechanism to the linear motion of the holding member relative to the movable member

Methodology Applied

Scientific EffectRack and pinion mechanism: Rack and Pinion

Data Source

PatentUS8813553B2Device for peel test

Publication Date: 2014.08.26 KYOWA INTERFACE SCI

AI summary

A device for a peel test. The device includes: a gripping member to grip an end of a test film to be peeled off a test object; a movable member linearly moving in a direction to or away from the gripping member; a holding member for the movable member capable of linearly moving in a direction along a peel surface of the test object while holding the test object; a moving mechanism configured to move the movable member linearly; a load measuring unit configured to measure a load applied to the gripping member; a first conversion mechanism to convert the linear motion of the movable member to rotational power, and output the rotational power; and a second conversion mechanism to convert the rotational power output from the first conversion mechanism to the linear motion of the holding member relative to the movable member.