BAIEN BN704 Cross Hatch Cutter

BN704

Cross Hatch Cutter

1 purpose

The paint film scratcher is designed and manufactured according to the ISO2409-1974 standard. It is mainly suitable for the determination of adhesion of organic coatings by the crosshatch method. It is not only suitable for laboratories, but also can be used at construction sites under various conditions.

2. Principle and Application

This instrument uses tools of a certain specification to cut and penetrate the coating into a grid pattern. The completed pattern is classified into six levels to evaluate the resistance of the coating to separation from the substrate.

The scratcher has three types of multi-blade cutting knives with spacing (1mm 2mm 3mm), which can be selected according to different test conditions. The multi-blade cutting knives with 1mm spacing are suitable for test pieces with coating thickness <60um; the multi-blade cutting knives with 2mm spacing are suitable for The knife is suitable for test pieces with a coating thickness of 60-120um. The blade cutting knife with a spacing of 3mm is designed for special purposes. The test piece should be made of steel, tinplate, aluminum or glass as the base material.

Three technical indicators

1. The spacing between multi-edged cutting knives is: 1mm 2mm 3mm

2. The straightness of the tooth tip of the multi-edged cutting knife is: ≯0.006mm ≯0.006mm ≯0.012mm

3. Multi-edged cutting knife working tooth tip width: ≯0.10mm

Four test tools

1. Soft brush (bring your own)

2.3x magnifying glass (provided with the instrument)

3. Adhesive tape (bring your own)

Four operations and usage methods

1. Test pieces need to be prepared in accordance with ISO R1514 and ISO 2808.

2. Place the test piece on a flat plate with sufficient hardness.

3. Hold the handle of the scratcher and make the multi-edged cutting knife perpendicular to the plane of the test piece.

4. Cut with uniform pressure, smooth and non-vibrating technique and a cutting speed of 20-50mm/S.

5. Rotate the test piece 90 degrees and repeat the above operation on the cut to form a grid pattern.

6. Use a soft brush to gently brush the test piece backward 5 times and forward 5 times along the two diagonals of the grid pattern.

7. The test should be completed at least on three different positions of the test piece. If the test results at the three positions are different, the test should be repeated on more than three positions and all results should be recorded at the same time.

Five things to note

   1. All cuts should penetrate the coating, but not too deep into the substrate.

2. If the coating is too thick and hard to penetrate the substrate, the test will be invalid, but it should be stated in the test report.

3. In special circumstances or when there are special requirements, the adhesive tape method must be used for measurement. The tape is generally a 25mm wide translucent tape, and the backing material is polyester film or acetate fiber. Paste the tape on the entire grid, and then Tear off at the minimum angle, and the result can be obtained by the ratio of the paint film surface to the peeling area.

4. The test should be conducted at a temperature of 23 ±2℃ and a Relative Humidity of 50 ±5%.

Six results assessment

Note: A magnifying glass can be used for visual inspection

8. Maintenance and storage

After the test is completed, the instrument should be wiped clean, placed in the instrument box, and placed in a dry place.

Nine random accessories

A 3x magnifying glass and an instrument screwdriver.

Packing list：

[Note]Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.