First, the choice of raw materials: the quicklime used in the sulphur stone sulphur mixture requires white color, light weight, no impurities, the finer the sulphur powder, the better, and then prepare some neutral detergent. The ratio of quicklime, sulfur powder and water is 1:1.7:11, and the amount of washing powder is 0.2%-0.3% of water consumption.
Second, the tanning method: When tanning, add the right amount of water in the pot and heat it with a large fire. Weigh the sulfur powder, quicklime and washing powder in proportion. When the water temperature is 40 ° C ~ 50 ° C, the sulfur powder is poured into the pot, the washing powder is added and stirred. When the water temperature is between 80 ° C and 90 ° C, the quicklime is slowly placed in the pot, and the mixture is quickly stirred while the fire is turned down. Once you find the overflow pot, pour a small amount of cold water. Start the recording after the pot (about 13 minutes), and pay attention to observe the color change of the liquid in the pot, and grasp the best heat. When the liquid is brick red, it means that the fire is not enough; when the liquid turns black and green, it means that the fire is big, the effect will be reduced; when the liquid is changed from brick red to reddish brown, it should be stopped immediately. After the ceasefire, the liquid can continue to react with its own residual heat, and the liquid quickly turns into a scented color, which can be cooled.
Third, note: (a) utensils should pay attention to. Do not cook or hold mother liquor in copper or aluminum pans. (2) Pay attention to the ratio of raw materials and the feeding procedure. After the raw materials are placed in the pot, they should be boiled by fire and at the same time pay attention to the color change of the liquid. (3) During the tanning process, a small amount of mother droplets can be dropped into the clear water, and the mother liquor is quickly dispersed to indicate that the fire is almost the same, and the pan can be discharged after further measurement with a Baume hydrometer. If you sink as below, you need to squat again. (4) When using, the water may be sprayed according to the weight multiplication method or the density multiple method according to different tree species, time and concentration requirements, so as to avoid unnecessary phytotoxicity. In the early spring, the orchard advocates spraying 1 or 2 times of high-concentration stone sulphur mixture. In other seasons, the concentration is too high. (5) Avoid using it for a long time. It is best to use the prepared stone sulphur mixture once, and it can not be used for a long time, otherwise it will reduce the efficacy. The mother liquor should be isolated from oxygen, and a layer of kerosene or diesel oil can be added to the mother liquor to prevent oxidation.
Huaxian County Liu Xiuling
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
Round head Tapping screw,hex tapping screw,flat head tapping screw,pan head tapping screw,truss head tapping screw
Shenzhen Lanejoy Technology Co.,LTD , https://www.szstainlesssteelwiremesh.com