The pvc-u tube has a lower overall cost than the cast iron pipe system of the same specification. The company's products are mainly white and gray, with bright color and bright and smooth. PVC-U pipe has excellent physical and chemical properties, corrosion resistance, high impact strength, low fluid resistance, and 30% higher flow rate than cast iron pipes of the same diameter. Anti-aging and long service life. According to the pilot data of the Ministry of Construction, the service life is 50 years. It is an ideal material for building drainage and sewage discharge. It is light and durable, easy to install, can speed up the project schedule and reduce construction costs, and save construction costs. First, the characteristics of PVC-U tube 1. Light weight: the weight per unit length is only 1/6 of the cast iron pipe; 2, high strength: tensile strength can reach more than 45Mpa; 3, the resistance is small: the inner wall of the pipe is smooth and does not scale. The head loss of the same diameter pipe is 30% lower than that of the cast iron pipe, which can save a lot of running power costs; 4. Corrosion resistance: It has good acid resistance, alkali resistance, chemical corrosion resistance, good electrical and electrical corrosion resistance, and no pitting phenomenon during use; 5, easy to install: flexible connection, rubber ring seal, easy installation, good sealing; 6, long life: under normal working conditions, the service life can reach 50 years; 7, non-toxic health: in line with drinking water standards, the water transported is not subject to secondary pollution; 8, low cost: low transportation and installation costs, material costs are cheap, the total cost of the project is 30% less than cast iron pipe Second, the performance of PVC-U tube: PVC-U pipe is a kind of structural pipe which is made of PVC resin as the main material and is added with corresponding processing aid through a specific extrusion die, and evenly distributes elliptical or other small holes in the longitudinal direction of the pipe wall. It has light weight and silence. It has the same rigidity as the same diameter PVC solid wall pipe, and is mainly suitable for building drainage, buried sewage and ventilation. The weight of PVC-U pipe is only about 1/5 of that of metal pipe. It is convenient to carry, load, unload and install, and the construction period is short; it can save construction costs. 1. Excellent chemical corrosion resistance: PVC-U tube has excellent acid and alkali resistance and corrosion resistance, and is suitable for chemical industry, wastewater discharge, sanitary down pipe, etc. It can resist corrosion of alkaline soils such as sulfates and carbonates; high impact strength: PVC pipe has high water pressure resistance, external pressure resistance and impact strength, and is suitable for piping engineering under various conditions. . The construction is convenient, and the requirements for backfilling are not high; in the municipal road engineering, it is not easy to be deformed by extrusion, and the overall cost is low; 2, the appearance is beautiful and generous: UPVC drain pipe appearance is white, bright and smooth, beautiful, bright color, can add a neat and light sense of the atmosphere of the building indoor environment. Simple construction: PVC pipes and fittings are connected by solvent-based adhesives. The joint construction is quick and easy, and the construction cost is low. 3, the overall cost is low: 20-30% lower than the comprehensive cost of using the same specification of cast iron pipe system. Good environmental protection: PVC is an environmentally friendly product that can be recycled and reused without any pollution to the environment. Good noise reduction and noise reduction: It has good sound-absorbing characteristics and can significantly reduce noise pollution. The noise reduction effect is more than 10dB. The smooth fluid resistance of the inner wall is small: the PVC-U pipe wall is smooth, the flow resistance is small, the roughness coefficient is 0.009, which is lower than other pipes, the flow rate is larger under the same pipe diameter, and the scale is not attached, and the pipe is not easy to block. 4, anti-aging long service life: PVC-U pipe elastic modulus with time changes small, to ensure the long-term performance of the pipe; design service life is more than 50 years; PVC-U resistance is strong: can effectively resist the roots of plants Penetration and penetration. Third, the technology of pvc-u tube: 1. Processing of pipe: After the length of pipe is determined, it can be cut by hacksaw, hand saw and small circular saw blade. Both ends should be kept flat after cutting, use a butterfly to remove the burrs and chamfer, the chamfer should not be too large. 2. Bonding of the pipe: Before the bonding, the test assembly must be carried out. The outer end of the pipe end of the inserted pipe should be about 50 mm long and the inner wall of the pipe fitting interface, and then scrubbed once with cotton yarn stained with acetone, and then on the bonding surface of the pipe. Apply a layer of adhesive evenly with a brush and do not leak. After coating, rotate to the ideal combination angle, insert the pipe into the socket of the pipe fitting, and then tap with the raft to make the pipe all inserted into the socket. After about 2 minutes, the pipe can not be disassembled or rotated, and the joint is wiped out in time. Glue out to keep it clean Fourth, PVC-U pipe application range: PVC-U pipes are suitable for conveying water at temperatures not exceeding 45 ° C, including general purpose and drinking water. 1. Civil, municipal, and water supply systems. 2. Utility drainage system. 3. Highway and road drainage systems. 4. Agriculture, forestry, horticulture, water conservancy and drainage systems.
Velcro disc is an abbreviation of sandpaper, a customary name. Velcro disc is also sandpaper. It is a conversion product of sandpaper. Its shape is a positive circle. It is flocked with sandpaper roll , and then put it on the stamping machine for stamping with *** circular die. The stamped product is velcro disc.
Sanding disc can be divided into two types according to the lamination: back glue disc sand and back velvet disc sand (also known as self-adhesive disc sand and brushed disc sand). The fluffed disc sandpaper can be non hole fluffed disc sand paper or hole fluffed disc sand paper. The velcro disc with holes is convenient to discharge waste chips from the holes when grinding objects, so as to improve the grinding efficiency. There are other classification methods. For example, according to the size, the common disc sands are 100mm, 115mm, 125mm, 150mm, 180mm and 215mm in diameter, and the diameter area of disc sands that can be used is 23mm --- 235mm.
According to the sand surface of disc sand, the common ones are white sand disc sand, red sand disc sand, yellow sand disc sand, black sand flocking disc sand, blue sand disc sand, green sand disc sand, grid flocking sand. And classified from the raw materials of disc sand paper, velcro discs can be divided into aluminum oxide velcro disc, silicon carbide velcro disc and zorconia velcro disc. Aluminum oxide velcro disc can be divided into ordinary aluminum oxide velcro disc, calcined aluminum velcro disc and so on. The particle size of disc sand is usually divided into 40# 60# 80# 100# 120# 150# 180# 220# 240# 320# 360# 400# 600# 800# 1000# 1200# 1500# 2000#.
And the application of disc sandpaper is extensive. From the space shuttle to the mobile phones and computers we use, disc sandpaper is used in the production process. Some parts of the space shuttle need to be finely polished with disc sandpaper, and the fuselage needs to be polished with disc sandpaper before spraying paint, so that there will be no paint peeling. Take our common notebook computers for example. If they can have such a mysterious appearance color, they can't lose the fine grinding of disc sand. It is mainly used for polishing, furniture, hardware, electronic accessories. At the same time, the efficiency of disc sandpaper grinding products is very high, which is faster, more convenient and less loss than conventional hand sandpaper grinding; However, the round sand disc also has some shortcomings. At present, with the gradual improvement of the requirements for the surface finish of the ground workpiece, the requirements for the base of the round sand are also higher and higher.
Velcro Disc,Velcro Sanding Discs,Velcro Paper Disc,Round Velcro Sanding Pads Henan Yuteng Abrasives Co.,Ltd , https://www.henanyutengabrasives.com