Place the sample on a firm surface, hold the hardness tester, press the needle in the middle hole at least 12mm from the edge of the test piece, and press the press foot firmly on the sample without any vibration, and keep the pressure foot parallel. On the surface of the sample, so that the pressure pin is pressed vertically into the sample, the force applied is just enough to make the pressing foot and the sample completely in contact. Unless otherwise specified, it must be pressed and the sample is fully pressed for 1 second. The internal reading, if it is Other interval time readings, must be stated, the hardness value is measured 5 times at different positions of the sample at least 6 mm apart, and the average value is taken.
usage notice:
(1) Before the measurement, the pointer of the hardness tester should be in the free state and should point to the zero position. If the amount of the pointer deviates from the zero position, the screw can be loosened in the upper right corner, the surface is rotated, and the zero position is aligned. Then press the hardness tester on the glass plate. When the end face of the press pin is in close contact with the bottom surface of the presser foot, the pointer should point to 100+/-0.5HA. If it is not pointing to 100+/-0.5HA, it can be slightly pressed. If the needle is pressed several times, if it still does not refer to 100 +/- 0.5 HA, the hardness tester cannot be used. When used on the Shore Durometer test frame, the handle can be moved to raise the table to the fixed weight, so that the end face of the press pin and the presser foot surface are in close contact with the glass table, the pointer should point to 100. +/-0.5HA. If not referring to 100
When +/-0.5HA, the adjustment screw of the workbench plane can be adjusted. If the pointer still does not refer to 100+/-0.5HA after adjustment, it is better to send the production unit to adjust.
(2), rubber sample and test temperature requirements; 1, rubber sample thickness is not less than 6mm, width is not less than 15mm, length is not less than 35mm, sample thickness is less than 6mm, can be measured by the same film overlap, but no more than 3 layers . And ask the film to be parallel up and down. 2. The room temperature is 23 °C ± 5 °C. The hardness tester is stored at this temperature for at least 1 hour.
(3), plastic samples and test temperature requirements; 1, plastic samples are square, side length 50mm, thickness 6mm. A 50 x 15 mm sample is also allowed. 2. Where possible, the sample shall be adjusted at the laboratory standard temperature in accordance with the provisions of GB/T2941-1991 before testing. The comparison test or series of tests must be carried out at the same temperature.
(4) The surface of rubber and plastic samples shall be smooth and flat, and there shall be no defects such as mechanical damage and impurities.
(5) After using the hardness tester for 35,000 times, it is recommended to check the relationship between the spring pressure and the pointer scale and the shape and size of the end of the press pin every 10,000 times.
(6) After the hardness tester is used, put it into the instrument box or the instrument box and place it in a dry place to prevent moisture.
(7), the lifting small shaft on the measuring rack and the bottom of the workbench, please pay attention to the regular rubbing, apply a small amount of anti-rust oil to prevent rust.
(8), using Shore hardness timing, when the value of the type A hardness tester is less than 10HA is not accurate, the measurement results can not be used. D type hardness tester is recommended when the type A hardness tester exceeds 90HA.
Plant extracts refer to substances extracted or processed from plants (all or a part of plants) using appropriate solvents or methods. They can be used in the pharmaceutical industry, food industry, daily chemical industry and other industries.
Plant extracts are based on plants as raw materials. According to the needs of the final product extracted, through the process of physical and chemical extraction and separation, one or more active ingredients in the plant are oriented and concentrated without changing the active ingredients. The product formed by the structure.
classification
1. According to the content of active ingredients, it can be divided into three types: effective monomer extract, standard extract and ratio extract;
2. Divided into glycosides, acids, polyphenols, polysaccharides, terpenes, flavonoids, alkaloids, etc. according to ingredients;
3. According to the product form, it can be divided into vegetable oil, extract, powder, lens, etc.
4. According to the purpose, plant extracts can be divided into natural pigment products, Chinese medicine extract products, extract products and concentrated products.
plant extract
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