The pressure gauge is a common instrument in our life. It mainly uses the elastic element as a sensitive element to measure and indicate the pressure above the ambient pressure.
It is widely used in our lives and involves major industries. Basically, he can be seen in all industrial processes and scientific research fields.
As a member of the society, we will have more or less exposure to a lot of pressure gauges. Therefore, we should develop a pair of eye-catching and well-recognized pressure gauges. I will introduce the pressure gauge testing procedures below.
First, appearance inspection
1. Before we get the pressure gauge, we should seriously look at the packaging, identify whether the origin of the pressure gauge is a regular way, and whether the packaging box is clearly marked.
2, After getting the pressure gauge, we should be very hungry to observe the surface of the pressure gauge, observe whether the appearance is smooth and even, no rust marks, no bad plating, and the welding place should be smooth and beautiful.
3, reading part, whether the reading is clearly visible, transparent cover is tainted. 4
4. Zero position, pressure gauge with limited nails. When there is no pressure, the pointer should be close to the stop pin, and the pressure gauge for infinite nailing should be within the zero mark when there is no pressure.
5. If the pressure gauge is filled with liquid, the liquid shall be clear and transparent, free of impurities or floating objects, and the liquid level shall be located at 0.25D-0.3D above the center of the case (D is the outside diameter of the instrument) and in a 60-degree incubator No leakage.
Second, the meter
1. Select an appropriate calibrator. The absolute value of the allowable error of the calibrator should not be greater than 1/4 of the absolute value of the allowable error of the gauge being tested.
2, standard instruments can be used spring tube precision pressure gauge and vacuum gauge, piston pressure gauge, piston vacuum pressure gauge
Third, the indication error, return error, and tapping displacement test
1. Indication error verification method, the pressure meter's indicating value verification is carried out according to the marking line marked with a number of digits. The timing is gradually and steadily stepped up (or stepped down). When the indication value reaches the upper limit of detection, the pressure source is cut off. Pressure 3MIN, and then press the original test point to step down (or boost) in reverse order.
2, return error, the same point of time, in the step-up (or step-down) and step-down (or step-up) detection, the specified absolute value of the allowable error.
3, tapping displacement, for each inspection, at the step-up (or step-down) and step-down (or step-up) inspection timing, the value of the indication change caused by the lightweight case is not greater than the absolute value of the specified allowable error 1/2.
4. Indication error: For each verification point, during the step-up (or step-down) and step-down (or step-up) detection, the difference between the front and rear display case of the lightweight case and the standard device shall meet the requirements.
The main function of the edge banding is to seal the cross-section of the board, so as to avoid the damage of the board and the adverse factors (mainly moisture) in the process of use and prevent the formaldehyde inside the board from volatilizing, and at the same time achieve the effect of beautiful decoration.
The product has the following main features: smooth surface, no blistering, no ribbing, moderate gloss, smooth surface and back surface, uniform thickness, uniform width, reasonable hardness, high elasticity, good quality, strong wear resistance, trimmed and sealed The color of the side and the side is close to the surface color, not whitish, good gloss, and the overall color of the finished furniture is coordinated.
Judge good or bad
1. Look at the hue and surface roughness of the edge banding strip. The color of the surface of a good edge banding strip is also very important. Whether the color is close to the customized product and is gorgeous. If the surface is very rough and there are pull marks, the quality is definitely not much better. This is the surface quality of the edge banding strip. It has nothing to do with the quality of the inner material of the edge banding, mainly the production process of the edge banding factory and the production technical skills of the employees. A good edge banding strip is: the surface must be smooth, no blistering or seldom bubbling, no drawing or few drawing, moderate gloss, not too shiny or too matte (unless there are special requirements).
2. Check the flatness of the surface and bottom of the edge banding and whether the thickness is uniform, otherwise it will cause the joint between the edge band and the board, the glue line is too eye-catching or the gap between the board and the edge band is too large, which will affect the overall beauty. Details determine success or failure, and often a small detail problem may bring an embarrassing situation where the overall effect is not good.
3. Whether the edge trimming is whitish, whether the surface of the bent edge strip is severely whitish, and whether the ground color of the trimming strip is close to the surface color of the board in question. PVC Edge Banding strips are mainly made of PVC and Calcium Carbonate plus additives. If the calcium carbonate content is too high, whitening of the edge banding and bending will occur, which proves that the quality of such products is not good.
4. Whether the strength is okay and whether there is elasticity. High strength means good wear resistance, and the corresponding quality is better. Too high strength also means increased processing difficulty. Low elasticity means low wear resistance and low aging resistance. In addition, according to actual production needs, manual trimming is generally required, and soft spots can be made appropriately, and the automatic edge banding machine can make hard points appropriately.
5. Whether the adhesive is applied evenly and whether it is easy to fall off during use.
6. Smell whether the PVC edge banding strips taste or not. Products produced with good quality raw materials generally have a small taste. If the taste is too large, it means that the quality of the raw materials used in production is relatively poor.
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Henan Shunbang Chemical Industry CO.,Ltd , https://www.pvcresinchem.com