Analysis of the experimental operation characteristics of the cloth surface grinding instrument

Fabric Flat Abraser, also known as Martindale Abrasion Tester, is a professional instrument mainly used for textile abrasion resistance and pilling experiments. In this article, Standard Group (Hong Kong) Co., Ltd. >textile The test conditions and working methods of the surface grinding instrument, as well as the details and maintenance to be paid attention to in the experiment, hope to serve as a reference for the majority of textile testing personnel.

Test conditions:
1. Room temperature: (23±2℃)
2. Technical parameters:
// >(4) Mass of material under pressure:
a. Holder: 200±1g
b. Garment sample weight: 395±2g
c. Furniture decoration sample weight: 594 ±2g
d.Stainless steel disc: 260±1g
(5) Effective friction diameter of grinding block:
A type 200g (1.96N) friction head (9KPa)￠28.8-0.084 mm
Type B 155g (1.52N) friction head (12KPa) ￠90-0.10mm
(6) Relatieve movement speed between holder and grinding table: 20-70r/min (adjustable)
(7) Mass of sample loading hammer: 2385±10g

Consumables configuration:
(1) 9 sets of sample holders;
(2) 9Kpa, 12KPa weights 9 pieces ;
(3)One set of Φ38mm and Φ140mm samplers;
(4)One piece of Φ38mm and Φ140mm sampler back plate;
(5)One pilling test set
(6 ) One set of SM50 standard photo;
(7) One set of EMPA standard pilling photo and one piece of SM-25 standard abrasive cloth 1.6m×5m;
(8 ) A set of standard foam 1.5 m×0.5 m (4 pcs/set);
(9) One piece of standard felt board;
(10) 20 pcs Φ90mm felt discs;
(11 )50 Φ38mm and Φ140mm sampling blades each;
(12)Other necessary accessories recommended by the manufacturer.

A short analysis of Li Sharus graphics:
Graphs shaped by changing movements. This movement is repeated diagonally from a circle to a tapering ellipse until it becomes a straight line, whencer it goes back to an expanding circle to a circle.

Experimental steps:
1. The sample is parked in the laboratory environment for more than 8 hours.
2. Cut a test piece from the flat part of the test piece. If it is an insole, it must be cut down to the transfer printing area. 3. Remove the load from the test machine Weight and load shaft.
4. Remove the top plate and test fixture.
5. Sample device: unscrew the fixing ring on the test fixture, remove the sample compact, put the sample into the test fixture base, and put a piece of sample between the sample and the test fixture base Gasket, then put the sample gland on the sample gasket and fix it with a fixing ring.
6. Wool felt and abrasive cloth device: loosen the fixing screw and fixing ring, place the wool felt on the base and spread the abrasive cloth, press a 2.5 kg pressure platethe center of the abrasive cloth, install Reinstall the retaining ring and tighten the set screw.
7. Replace the top plate and insert the load shaft (12KPa) through the round hole in the top plate. 8. Place the test fixture with the sample facing down on the base fixture, adjust the circular groove of the test fixture to align with the load axis, and insert the load axle into the circular groove of the test fixture. 9. Set the number of times according to the standard, start the switch and start the test.
10. After reaching the set number of times, it will automatically stop and remove the sample to determine the result.

Precautions:
(1) Determination of the inspection interval (number of rubs): The inspection interval is set to prevent the rubbing of the fabric from exceeding the predetermined number of times. In the sample fracture test, avoid wearing out the sample so that the number of abrasions cannot be determinedld. When evaluating the appearance change, set the inspection interval to avoid missing the friction times that cause the surface change of the sample.
(2) The test sample shall be placed in a relaxed state on a smooth, air-ventilated surface and placed at standard atmospheric pressure for at least 18 hours. When sampling, the distance from the edge of the fabric should be at least 100mm, and a sufficient number of samples (usually a minimum of 3 pieces) should be cut from the entire laboratory sample, and all information about the fabric should be included as much as possible.

Notes on the operation of the Martindale Abrasion Tester:
1. The friction cloth cannot be used repeatedly, and a friction cloth must be replaced each time a test is completed;
2. Wool felt can be used Repeated use, if the surface is worn or stained, it should be replacedreplace and can be used on both sides;
3. The insole must be dressed first and then the Martindale abrasion test is carried out;
The test is completed. If the surface table of the final sample has abnormal phenomena such as wear, broken yarn, fluff, severe pilling and severe wear, it will be judged as unqualified. 5. When preparing samples, special attention should be paid to prevent hair changes on the cutting edges, so as to avoid unnecessary loss of quality and appearance changes.
6. Pay attention to operating specifications and personnel safety while using the instrument.

Evaluation of the abrasion resistance of the fabric
The evaluation of the abrasion resistance of the fabric usually has the following methods:
1. Observation of changes in appearance
Commonly used in Under the same test conditioncircumstances, after the specified number of abrasions, observe the changes in the surface gloss, lint, pilling and other appearance effects of the sample, and usually compare it with the standard sample to evaluate its quality. It is also possible to use the friction required to make a certain number of sand lines break on the surface of the sample after sanding, or to make holes of a certain size appear on the surface of the sample. times as basis for evaluation.
2. Determination of changes in physical properties
After the sample has been worn for a certain number of times, the changes in physical and mechanical properties such as weight, thickness and breaking strength are measured to determine the degree of abrasion resistance of the fabric.

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