Grips & Fixtures
Angular & Shear
Variable Angle Peel Testing TJ 123
About Grips
– Peel fixtures are suitable for testing the peel strength of a wide range of laminated materials and components including copper runners on printed circuit boards, thin film coatings, adhesive tapes and other bonded structures.
– Used to determine the peel strength of adhesives applied to materials such as stickers, Labels, etc.
– Fixture is designed for testing at various angles from 90o to 180o. The unit utilizes linear ball bearings to provide virtually friction–free movement.
Principle Of Operation
- The fixtures incorporate a moving table, which is coupled to the crosshead or actuator of the materials testing machine through a cable and pulley.
- As the crosshead (or actuator) is driven in the tensile direction the cable pulls the table laterally to maintain the required peel angle throughout the test.
- This method prevents the exertion of outside forces on the sample.
- The force required to peel the specimen is measured by the machine load measurement system providing a direct measure of bond strength.
- The substrate or base of the test sample is clamped to the moving table via a set of clamps.
Application Range
- Copper runners on printed circuit boards
- Thin films and coatings
- Adhesive tapes and packaging
- Stickers, labels etc
Types Available
A) Variable Angle Peel Fixture:
Peel angles Settable at: 30, 45, 60, 90, 120, 135 or 150 degrees.
Maximum operating temperature: 60°C (140°F).
The variable angle peel fixture is designed for determining the bond and peel strength of microelectronics components like copper runners, films, tapes etc. when peeled from circuit board, substrates or components. Through the use of a special linkage system, the peel angle is maintained constant during the test. The substrate or component is clamped to the table of the fixture via an “up-down” clamping system. The moving table is then attached to the actuator or crosshead of the test system. The motion of the actuator or crosshead creates movement on the clamp base but only peel forces are sensed and recorded.
B) 90-Degree Peel Fixture :
Peel Stroke: 180 mm.
Maximum Specimen Width: 70 mm.
Suitable for peel testing of microelectronics components like copper runners, thin films, tapes, etc. in a circuit board, substrate or component. The substrate or base is clamped via a set of top-down clamps. The fixture is coupled to the moving actuator or crosshead of the test system to ensure a 90-degree peel angle throughout the test.
c) 180-Degree Peel Fixture:
Peel Stroke: 180 mm.
Maximum Specimen Width: 70 mm.
Suitable for peel testing of microelectronics components like copper runners, thin films, tapes, etc. in a circuit board, substrate or component. The substrate or base is clamped via a set of top-down clamps. The fixture is coupled to the moving actuator or crosshead of the test system to ensure a 90-degree peel angle throughout the test.
Coefficient Of Friction Fixture – TJ 150
About Grip
– Co-efficient of friction fixture consists of a horizontal flat bed incorporating a sled.
– The underside of the sled has a layer of smooth-faced foam rubber.
– It uses the tensile motion of the tester to measure the force it takes to pull a weighted sled covered in the tester material across a surface.
– In principle, the test specimen is supported on a friction table, consisting of a horizontal test table, a sled, and a driving mechanism via a pulley to produce a relative motion between the sled and the test table.
– One piece of the material is attached to the table with double-sided adhesive tape. The other piece is wrapped around the sled and secured on the top of the sled with double-sided adhesive tape.
– This sled is then placed onto the specimen on the table. The test machine is driven at a constant rate of displacement, which drags the sled across the length of the specimen on the table.
– The force is recorded, and test results are calculated for static and kinetic coefficient of friction
Principal Of Operation
The coefficient of friction test fixture consists of a fixed horizontal table and a moveable sled. Both the table and sled can be covered with the test material. A tow line attaches the sled to a low force load cell with a pulley guiding the tow line during the test. The fixture is mounted to the base of the instrument and, as the crosshead/ load cell moves, the sled is pulled across the horizontal table. Data is recorded from the load cell during the test and analyzed to determine both static and kinetic friction. The static friction is derived from the first maximum peak (force) on the load curve and kinetic friction is derived from the average force between two predefined points. The coefficient of friction is defined as the recorded force divided by the mass of the sled.
Description
Description:
– The model TJ 123 coefficient of friction fixture is a testing fixture to measure the static and kinetic coefficient of friction of plastic film and sheet using the ASTM D 1894 standard.
– The major items of the fixture include a square metal sled wrapped with a thick foam pad and a rectangular shape metal table with a defined surface finish.
– A pulley is located at one end of the table which allows the sled, when attached to the crosshead via a nylon or metal tow line to be pulled horizontally along the plate.
– Test material can be attached to either the sled or the plate or both
Features
- Mounts to the Dak test instrument using the standard base & load cell adapter
- For measurement of slip friction to ASTM specification D 1894.
- Specimen can be mounted to the sled, the plate or both
- Allows precise measurement of the static and kinetic coefficient of friction
- Fixture includes both a nylon and a metal tow line
- Adaptable to most standard universal testing instruments.
Application
– Used to determine the static and kinetic coefficients of friction of plastic film and paper when sliding the specimen over itself under controlled test conditions.
– A sheet of the specimen is secured to a horizontal bed and another sample of the specimen is drawn across the test bed specimen.
– This measure the force required to overcome the frictional resistance between the two imposed surfaces, when one surface is moved relative to the other along their plane of contact.
– The static coefficient of friction is determined by the force required to overcome the initial resistance between the two surfaces.
– The kinetic coefficient of friction is determined from the subsequent force when continuously sliding at a constant rate.
German Rotating Wheel Fixture- TJ 152
About Grip
Description:
The fixture consists of a 152 mm (6.0 in) diameter, 25.4 mm (1 in) wide, bearing mounted wheel. As the crosshead is driven in the tensile direction, the load weighing system measures the force of the tape or release coating pulling against the wheel. The rotation of the wheel maintains a constant 90° peel angle.
Principle Of Operation
- The rotating German wheel peel fixture measures the bond strength of tapes, laminated release coatings and paper and plastic films.
- The backing of the release film is attached to the wheel with two-sided adhesive tape or the tape is attached directly to the wheel.
- To initiate a test, the fixture is attached to the base of the materials testing system.
- The release coating is then partially peeled from the backing medium or the tape is partially peeled from the wheel and the free end of the sample is inserted into an appropriate upper grip.
- The force required to peel the tape or release coating is monitored by the load-weighing system, providing a direct measurement of bond strength.
- The upper grip, which is connected to the crosshead, is then driven in the tensile direction and the tape or release coating is peeled from the wheel or the backing at a constant peel angle.
Features
- Precisely measures adhesive strength of tapes, laminated release coatings, paper and plastic films
- Attaches directly to most Dak materials test systems
- Maintains constant 90° peel angle for accurate measurement
Application Range
- Laminated release coatings
- Paper and plastic films
H-Adhesion - TJ 132
Application
To determine the tensile adhesion properties of the adhesives used on the ceramic tiles & mosaics
Application Range
- Adhesive strength testing
- Concretes, construction chemicals, mosaics, tiles etc
Tensile Shear Fixture- TJ 311
Application
To determine the Shear Adhesion properties of the adhesives used on the ceramic tiles & mosaics
Application Range
- Adhesive strength testing
- Concretes, construction chemicals, mosaics, tiles etc
Tile Slant Shear Fixture -TJ 532
Application
To determine the Slant Shear Adhesion properties of the adhesives used on the ceramic tiles & mosaics
Application Range
- Adhesive strength testing
- Concretes, construction chemicals, mosaics, tiles etc
Shear Fixture - TJ. 157
Application
To determine the tensile adhesion properties of the adhesives used on the ceramic tiles & mosaics
Application Range
- Adhesive strength testing
- Concretes, construction chemicals, mosaics, tiles etc