Features

High installation location: Elevated ducts are generally installed at the top of buildings, above ceilings, or on steel structures at high elevations to provide ventilation or air conditioning coverage for specific areas.

Efficient use of space: It can deliver air to the required areas without occupying floor space. This is particularly important for places with limited space, such as industrial plants, large warehouses, and gymnasiums, as it can effectively utilize vertical space and improve space utilization.

Long air delivery distance: Due to the high installation position, the air duct can utilize natural air flow and pressure differences to deliver air over long distances, thereby achieving large-area ventilation or air conditioning coverage.

Aesthetically pleasing: Elevated ductwork is typically installed at a height where it is not easily visible to people, thereby minimizing its impact on the appearance of the building and keeping the interior neat and attractive.

High construction difficulty: Installation at high altitudes requires specialized high-altitude work equipment and technical personnel. Safety issues must be addressed during construction, which also increases the difficulty and cost of construction.

Maintenance inconvenience: Due to its elevated position, maintenance personnel need to use professional climbing equipment to perform repairs, maintenance, and other tasks, which increases the difficulty and cost of maintenance and places higher demands on the skills and safety awareness of maintenance personnel.

application scenarios

Industrial plants: Used to remove exhaust gases, dust, and heat generated during production, provide fresh air, improve the working environment, protect workers’ health and safety, and also help protect equipment and improve production efficiency.

Large warehouses: such as automated multi-level warehouses, which can control the temperature and humidity of different areas within the warehouse to ensure proper storage conditions for goods and prevent them from becoming damp, moldy, or spoiled.

Commercial buildings: such as shopping malls, supermarkets, shopping centers, etc., used to regulate indoor air temperature, humidity, and air quality, providing customers and employees with a comfortable shopping and working environment.

Sports venues: Able to meet the ventilation and air conditioning needs of large numbers of spectators and athletes in sports venues, ensuring fresh air and comfortable temperatures inside the venue, thereby enhancing the spectator experience and the competitive performance of athletes.

Transportation hubs: such as train stations and airports, can effectively regulate the air environment in areas such as lobbies, waiting rooms, and waiting areas, providing passengers with a comfortable waiting space.

Installation points

Construction plan formulation: Based on the specific conditions of the construction site, including building structure, duct installation location, height, quantity, specifications, and models, formulate a detailed construction plan, clarify construction objectives and construction sequence.

Safety measures: Set up safety warning signs at the construction site, cordon off the construction area, and prevent non-construction personnel from entering. Set up a suitable aerial work platform, ensure that the platform legs are evenly distributed, install guardrails and anti-slip boards, and set up safety nets below the work platform.

Duct inspection and hoisting: Inspect the ducts before construction to ensure that they are free of damage, deformation, and other issues. Set hoisting points based on the length and weight of the ducts, generally at both ends and in the middle, and use special lifting lugs to secure them firmly. During hoisting, a designated person should be in charge to ensure that the ducts are lifted vertically and do not hit nearby obstacles.

Duct connection and sealing: Align the duct ends and ensure that the interface is flat and straight. Use sealing tape, sealant, or flanges to seal the duct system and prevent air leakage. For duct bends and diameter changes, use special elbow components and diameter change pipes, and pay attention to the sealing of the interface.

Installation Quality Inspection: After installation is complete, inspect the installation quality of the ductwork section by section, including whether the ductwork is straight, whether the connections are secure, and whether there are any air leaks. Use professional testing instruments to conduct airtightness tests, airflow and air velocity tests, etc., on the ductwork system to ensure that it meets design requirements.

1. Mechanical cutting

Mechanical cutting is one of the common ways of cutting plates. This method mainly uses a cutting machine or punch press to cut the sheet through the action of mechanical force. The operation requires precise adjustment of the position of the cutter and the depth of cut to ensure accurate and smooth cutting. The advantage of mechanical cutting is that it is easy to operate, suitable for mass production and relatively low cost.

2. Laser cutting

Laser cutting is a high-precision method of cutting plates. It uses a high-power laser beam to irradiate the sheet, causing it to melt or carbonize locally, and then blow the melted material away from the sheet through airflow or mechanical force, thus realizing cutting. The advantages of laser cutting are high cutting precision, high speed and suitable for cutting complex shapes.

3. Thermal cutting

Thermal cutting is mainly to soften the sheet by high temperature, and then use mechanical force or blade to cut. This method is suitable for thicker plates. The advantage of thermal cutting is that it is suitable for different thicknesses of plates, but the operation needs to pay attention to the control of the temperature, to avoid overheating caused by the deformation of the plate.

When carrying out plate cutting, the following points should also be noted:

1. choose suitable cutting tools and equipment, according to the thickness and hardness of the sheet.
2. keep safe when operating, wear protective glasses and gloves to avoid splash injury.
3. make sure the surface of the plate is clean and free of impurities before cutting to improve the cutting quality.

The welding method of PP sheet mainly includes the following steps:

1. Preparation: Before welding, you need to make sure that the welding tools are functioning properly. Check whether the nozzle of the welding gun and the screws of the gun body are loose or off, and connect the power cord of the welding apparatus to ensure that the power supply is not loose.
2. .Pre-welding treatment: Wipe the PP sheet clean and make sure the welding area is dry and free of dust and grease. In addition, it is also necessary to chamfer the edges of the PP sheet.

Welding Sequence:

1. Use hot gas welding or a torch for welding. Hot gas welding can be done with an inert gas such as air or nitrogen; the gas must be dry and free of dust and grease.
2. Clamp the two PP sheets with a fixture to ensure the correct welding position. When welding, hold the welding tool in one hand and press the welding rod into the weld area with the other hand.
3. The welding torch and the object to be welded make an angle of 45 degrees and push the welding rod at a constant speed, while the welding torch moves along the connecting axis in the form of a pendulum to ensure the quality of welding.
4. During the welding process, the welding pressure needs to be controlled to avoid too light or too heavy, so as not to affect the welding effect.

After welding: after welding is completed, first put the welding torch on the workbench, cut off the power supply, clean up the workplace, and finally put the welding tools and materials back to their original places.

Things to keep in mind during the welding process include:Ensure that the welding electrode is the same as the base material to obtain the best weld strength.
Adjust the temperature of the welding torch between scale 3-4 to avoid too high or too low temperatures, which may affect the quality of the weld.
Weld quality is dependent on the welder’s skill and ability to control welding pressure.

• PVC: It has stable physical and chemical properties, insoluble in water, alcohol, gasoline, and low leakage of gas and water vapor; It can resist any concentration of hydrochloric acid, less than 90% sulfuric acid, 50-60% nitric acid and less than 20% caustic soda solution at room temperature, and has certain chemical corrosion resistance; It is quite stable to salts, but can be dissolved in organic solvents such as ethers, ketones, chlorinated aliphatic hydrocarbons and aromatic hydrocarbons.

• PP: Polypropylene is a non-toxic, odorless, tasteless milky white highly crystalline polymer with a density of only 0. 90–“0. At 91g/cm3, it is one of the lightest varieties of all plastics at present. It is particularly stable to water and has a water absorption rate of only 0 in water. 01%, with a molecular weight of about 80,000 to 150,000.Good formability, but due to the large shrinkage rate (1% ~ 2.5%), thick-walled products are easy to dent, for some parts with high dimensional accuracy, it is difficult to meet the requirements, and the surface gloss of the products is good.

The characteristics are different

• PVC: PVC has the advantages of flame retardant (flame retardant value of more than 40), high chemical resistance (resistance to concentrated hydrochloric acid, sulfuric acid with a concentration of 90%, nitric acid with a concentration of 60% and sodium hydroxide with a concentration of 20%), mechanical strength and good electrical insulation.

• PP: non-toxic, odorless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, can be used at about 100 °C. It has good dielectric properties and high-frequency insulation, and is not affected by humidity, but it becomes brittle at low temperature, is not wear-resistant, and is easy to age. It is suitable for making general mechanical parts, corrosion-resistant parts and insulating parts. Common organic solvents such as acids and alkalis have almost no effect on it and can be used for the production of tableware.

The application scenarios are different

• PVC: Stabilizers, lubricants and fillers are added to PVC, and after mixing, the extruder can be used to extrude hard pipes, special-shaped pipes and corrugated pipes of various calibers for sewer pipes, drinking water pipes, wire casings or stair handrails.
• The calendered sheets are superimposed and hot-pressed to make rigid sheets of various thicknesses. The sheets can be cut into the desired shape and then welded with hot air using PVC electrodes into a variety of chemically resistant tanks, air ducts and containers.
• The extruder can be extruded into hoses, cables, wires, etc.; Using injection molding machines with various molds, it can be made into plastic sandals, shoe soles, slippers, toys, auto parts, etc.

• PP: household appliances, plastic pipes, high permeability materials, After adding related materials, the extruder can be used to extrude various calibers of hard pipes, special-shaped pipes, spray towers, activated carbon boxes, etcetc.
• Polypropylene has good mechanical properties, and can be directly manufactured or modified to manufacture parts and components of various mechanical equipment, such as manufacturing industrial pipelines, agricultural water pipes, motor fans, infrastructure templates, etc. Modified polypropylene can be molded into bumpers, scuff strips, car steering wheels, dashboards and interior decorations, etc., which greatly reduce the weight of the body and achieve the purpose of saving energy.
• Modified polypropylene can be used to make insulating shells of household appliances and washing machine liners, and is widely used in insulating materials for wires, cables and other electrical appliances. The polypropylene composite material made of homopolymer polypropylene 60~80 parts by weight, ethylene-vinyl alcohol copolymer 20~40 parts, compatibilizer (reactant of polypropylene maleic anhydride graft and ethylene-vinyl alcohol copolymer) 1~10 parts, mixed at 170 °C ~ 190 °C has high toughness, its impact strength is as high as 210J / m, has high gas barrier properties, and the permeable vapor rate is close to 2000g · μm / (m2 · 24h). In the preparation of barrier films, the traditional film-making process can be used for production, the process is relatively simple, and the production cost is low.

• Profiles and processed profiles are the largest areas of PVC consumption in China, accounting for about 25% of the total consumption of PVC, mainly used to make doors and windows and energy-saving materials, and their application is still growing significantly in the country. In developed countries, the market share of plastic doors and windows is also the highest, such as 50% in Germany, 56% in France, and 45% in United States.

PVC pipes

• Among the many PVC products, PVC pipes are its second largest consumption area, accounting for about 20% of its consumption. In China, PVC pipes were developed earlier than PE pipes and PP pipes, with many varieties, excellent performance and wide range of use, and occupy an important position in the market.

PVC film

• The consumption of PVC in the field of PVC film ranks third, accounting for about 10%. After PVC is mixed with additives and plasticized, a three- or four-roll calender is used to form a transparent or colored film of a specified thickness, and the film is processed in this way to become a calendered film. It can also be cut and heat-sealed to process packaging bags, raincoats, tablecloths, curtains, inflatable toys, etc. Wide, transparent films can be used in greenhouses, plastic greenhouses and mulch films. Biaxially oriented film can be used for shrink wrapping due to heat shrinkage.

PVC hard materials and sheets

• Stabilizers, lubricants and fillers are added to PVC, and after mixing, the extruder can be used to extrude rigid pipes, special-shaped pipes and corrugated pipes of various calibers for use as sewer pipes, drinking water pipes, wire sleeves or stair handrails. The calendered sheets are superimposed and hot-pressed to make rigid sheets of various thicknesses. The sheets can be cut into the desired shape and then welded with hot air using PVC electrodes into a variety of chemically resistant tanks, air ducts and containers.

PVC soft products

• The extruder can be extruded into hoses, cables, wires, etc.; Using injection molding machines with various molds, it can be made into plastic sandals, shoe soles, slippers, toys, auto parts, etc.

PVC packaging material

• Polyvinyl chloride products are mainly used for packaging, mainly in various containers, films and rigid sheets. PVC containers are mainly used in the production of mineral water, beverages, cosmetic bottles, and also for packaging of refined oils. PVC film can be used to co-extrude with other polymers for low-cost laminates, as well as transparent products with good barrier properties. PVC film can also be used in stretch or heat shrink wrap for mattresses, fabrics, toys, and industrial goods.

PVC wainscoting and flooring

• PVC wainscoting is mainly used to replace aluminum wainscoting. In addition to a part of PVC resin, the rest of the components in PVC floor tiles are recycled materials, adhesives, fillers and other components, which are mainly used in the hard ground of airport terminals and other places.

Polyvinyl chloride consumer goods

• Luggage bags are a traditional product made from PVC, which is used to make a variety of imitation leather, used in luggage, sports products such as basketball, football and rugby. It can also be used to make belts for uniforms and special protective equipment. PVC fabrics for clothing are generally adsorbent fabrics (no coating required), such as ponchos, baby pants, faux leather jackets and various rain boots. Polyvinyl chloride is used in many sports and entertainment products, such as toys, records and sports goods, and PVC toys and sporting goods have grown significantly and have advantages due to their low production costs and ease of molding.

PVC coated products

• Artificial leather with a substrate is made by applying PVC paste to cloth or paper and then plasticizing it at temperatures above 100 °C. It can also be made by calendering PVC and additives into a film and then pressing it with a substrate. Artificial leather without substrate is directly rolled into a soft sheet of a certain thickness by a calender, and then pressed with a pattern. Artificial leather can be used to make suitcases, bags, book covers, sofas and car cushions, etc., as well as floor leather, which is used as a flooring material for buildings.

PVC foam products

• When soft PVC is mixed, an appropriate amount of foaming agent is added to make sheets, which are foamed into foam plastics, which can be used as foam slippers, sandals, insoles, and shockproof cushioning packaging materials. It can also be used as a basis for extruder into low-foaming hard PVC sheets and profiles, which can replace wood and is a new type of building material.

PVC transparent sheet

• PVC is mixed with impact modifier and organotin stabilizer to become a transparent sheet after mixing, plasticizing and calendering. It can be made into thin-walled transparent containers or used for vacuum blister packaging by thermoforming, which is an excellent packaging material and decorative material.

The biggest feature of polyvinyl chloride is that it is flame retardant, so it is widely used in fire protection applications. But PVC releases hydrogen chloride and other toxic gases, such as dioxins, during combustion.

The density of pure PVC is 1.4 g/cm3, and the density of PVC plastic parts with plasticizers and fillers is generally 1.15-2.00 g/cm3.

Rigid polyvinyl chloride has good tensile, bending, compressive and impact resistance, and can be used as a structural material alone. The softness, elongation at break, and cold resistance of flexible PVC will increase, but the brittleness, hardness, and tensile strength will decrease.

Polyvinyl chloride has good electrical insulation properties and can be used as low-frequency insulation materials, and its chemical stability is also good. Due to the poor thermal stability of polyvinyl chloride, long-term heating will lead to decomposition, release HCL gas, and discolor polyvinyl chloride, so its application range is narrow, and the use temperature is generally between -15~55 °C.