Deze has extensive experience in the fabrication of metal materials for filtration & separation. For the accurate control of raw materials, equipment accuracy requirements, pre-shipment quality inspection is our basic guarantee of customer product requirements.

Weaving

Woven wire mesh is widely used in different industries and is inseparable from the diverse characteristics of weaving methods. Due to the different weaving methods, each mesh has its own characteristics. With different connection methods of warp and weft, a variety of weaving patterns can be produced.

weaving process
weaving

Plain weave is the most common basic weave structure. Each warp thread is alternately crossed above and below each weft thread, and the warp and weft threads are woven at a 90-degree angle. Warp and weft threads are usually the same diameter. Creates maximum weave stability and the same mesh count in both directions.

All sizes and apertures of our plain weave meshes conform to global standards. Our production cell is equipped with advanced machinery to weave wire cloth from different materials according to order. Wire coils of different diameters can be made into specific lengths and widths according to customer requirements.

twill weaving

The thread in twill weaving runs in a diagonal pattern. In twill weaving, the weft is woven on one or more warp threads, and then on one or more warp threads. One or more warp fibers are alternately woven above and below two or more weft fibers in a regular repeating manner. This will produce the visual effect of straight or broken diagonal “ribs” on the fabric.

Twill fabrics have a tighter yarn arrangement because less interlacing gives greater weight and good drapability. With the decrease of curl, the surface of the fabric becomes smoother and the mechanical properties are slightly higher. A basic fabric with a diagonal effect on the front or right side of the fabric. In some twill fabrics, the diagonal effect can also be clearly seen on the back of the fabric. With the twill pattern, the warp will not be severely deformed and subjected to physical stress like the plain weave. The strength of this design lies in its suitability for applications subject to high levels of mechanical stress.

Dutch plain weave

Dutch plain weave consists of a limited number of warp threads interwoven with a maximum number of weft threads, resulting in a stable and strong fabric. It has high filtration levels and high pressure load resistance. A specific opening is created by multiplying the number of wefts of a specific size by the sum produced by their diameter. Since the wires are positioned together in a specific way during the weaving process, the size of the opening cannot be calculated in the usual way.

Dutch plain weave fabrics are available in two sizes of wire diameters, one where each warp thread with a thick wire diameter passes alternately over and under one weft thread to provide high tensile strength of the mesh. The other is that weft threads with filament diameters pass alternately above and below one warp thread to form pores for filtering.

Dutch twill weave

The weft of Dutch twill weave is driven tightly upwards, so there is always a weft above and below the warp, resulting in a fabric that completely covers the warp. Weft threads are smaller in diameter than warp threads, which are closer to each other. The runner geometry is extremely tortuous, allowing reasonable flow rates while ensuring good particle size retention.

Dutch twill weave filter effect is better. When passing through a twill Dutch grid, impurities must pass through five offset pore levels. This means that long, thin, rod-like and fibrous particles are firmly retained. Fine-gauge twill mesh is used for fine filtration. Thicker gauge twill Dutch mesh is used for pressure and vacuum filtration.

4.3.1p6 weaving process

Five shed twill weaves are generally rectangular holes with each warp thread passing above four threads and one thread below to provide a very smooth surface on one side that promotes efficient cake removal. This robust construction offers high flow rates and good dewatering quality.

Reserve dutch weaves

Reserve dutch weaves are produced in the reverse arrangement of the plain dutch weave threads, where the thinner warp threads are positioned closely together and the thicker weft threads are woven at set intervals. This construction provides a high degree of stability and optimum resistance to high pressures.

Sintering

Sintering is the process of compacting and forming a solid object by heat or pressure without melting it to the point of liquefaction. Sintering occurs during natural or artificial manufacturing processes. The sintering process is one of the factors of the catalytic deactivation process. In catalytic technology, loss of active surface area of bulk catalysts and supported catalysts due to agglomeration or migration of small crystallites into larger crystallites, with concomitant collapse of pore structure and loss of internal surface area of these catalysts and subsequent deactivation processes . Temperature control is very important to the sintering process because grain boundary diffusion and bulk diffusion are heavily dependent on temperature, size and distribution of material particles, material composition, and sintering environment.

4.3.2p1 Sintering process

Sintering is essentially the same process used for conventional moulded powder metallurgy parts and can be carried out in a continuous or batch furnace, either as a separate unit or integrated into a complete production line. It is carried out in a protective atmosphere or in a vacuum at temperatures well below the melting point of the metal. The type of sintering process and sintering conditions depend on the composition and quantity of the material to be sintered. Unlike molded powder metallurgy compacts, metal injection molded parts must undergo significant shrinkage during sintering, which may require higher sintering temperatures and longer sintering cycles.

Sintering can effectively reduce porosity and enhance properties such as strength, electrical conductivity, transparency and thermal conductivity. However, in other cases it is useful to increase its strength but maintain its gas absorbency. During the firing process, the diffusion of atoms drives the interface between powder particles to disappear. This process is divided into different stages:

Sintering process

In the early stage of sintering, the original contact points or contact surfaces are transformed into crystalline bonds, which means that the sintered necks will undergo a process of diffusion, nucleation, growth and formation migration of atoms.

In the middle stage of sintering, atoms or molecules migrate towards the mass of the particle binding surfaces and reduce the spaces between the particles, allowing the matrix powder to form a continuous network. The increase in matrix strength is the main feature of this stage.

In the later stage of sintering, the pores gradually become discontinuous, the shape of the pores tends to be spherical, and the pore size and volume of the sintered body will slowly shrink.

Stamping

Stamping mesh

Stamping is the process of placing a flat sheet of metal in the form of a billet or coil into a stamping press, where tool and die surfaces shape the metal into a net shape. Stamping includes various sheet metal forming manufacturing processes, in which each station in the tool then performs a different cut, punch or bend. The actions of each successive station are added to the work of the previous station to form a complete part.

Stamping is the process of forming metal through tools in a stamping press, either cold stamping or hot forming. Cold stamping puts flat metal in blank form into a stamping machine. In a press, a punch pushes the metal into a die, making the metal into a finished product. Hot stamping is a material forming method in which the blank is first heated to a certain temperature, and then stamped in the corresponding mold with a stamping machine and pressure-hold quenched to obtain the desired shape and at the same time realize the phase change of the metal material.

Stamped metal mesh is a flat sheet of metal made by stamping slots in a sheet of metal and stretching it into an open pattern. Stamped metal mesh can be slotted and stretched, with openings in various patterns and strand sizes. Stamping is the process of stamping a custom shape from a sheet or roll of wire mesh. It involves placing a specific kind of mesh into a special punch and then pressing a custom die into the mesh to give you the mesh pieces in the desired shape.

4.3.3p2 Stamping mesh patterns

Hemming

Hemming

The equipment used for hemming is mainly punch. The metal plate and the stainless steel wire mesh are pressed into shape by using the pressure of the punch. The materials for hemming are various, such as stainless steel, aluminum, copper and other metal materials. The material surface of the hemming filter screen is dusty but easy to remove dirt, which can be washed with soap, weak detergent or warm water.

Use a small tonnage punch to punch the metal wire mesh into small round, square or other shaped pieces Then, the metal plate is punched into a ring shape and necked. Put the punched metal mesh into the ring. Press and flatten the ring again.

The hemming filter is punched into pieces by the die on the stamping machine, and is made by combining the metal screen with the support screen of different mesh numbers and through the hemming process.

Hemming

Welding

Welding is a manufacturing process that uses high temperatures to melt parts together and allow them to cool, thus joining materials together, resulting in fusion. Welding is different from low temperature technologies such as brazing and soft welding, which do not melt the parent metal. In addition to melting the base metal, filler materials are usually added to the joint to form a molten weld pool, and then cooled to form a joint, which can be stronger than the base metal according to the weld configuration. Pressure can also be used in combination with heat or alone to produce welding. Welding also requires a form of shielding to protect the filler metal or molten metal from contamination or oxidation.

Welding
Welding

Deze provides you with high-quality and reliable welding solutions. We have a variety of welding processes:

Gas welding is one of the most common welding processes. The equipment is relatively simple and inexpensive. Generally, acetylene is burned in oxygen to produce a welding flame temperature of about 3100 ° C. As the concentration of flame is lower than that of arc, the cooling rate of weld is slow. Although it simplifies the welding of high alloy steel, it may lead to greater residual stress and weld deformation.

Arc welding uses a welding power source to create and maintain an arc between the electrode and the substrate to melt the metal at the welding point. They can use direct current (DC) or alternating current (AC) and consumable or non consumable electrodes. Welding areas are sometimes protected by some type of inert or semi inert gas, and sometimes filler materials are used.

Resistance welding involves the generation of heat by an electric current passing through a resistance caused by contact between two or more metal surfaces. When the high current passes through the metal, a small molten pool is formed in the welding area. In general, the resistance welding method is highly efficient and has little pollution, but its application is limited and the equipment cost may be high.

Spot welding is a common resistance welding method, which is used to connect overlapping metal plates with a thickness of 3mm. The two electrodes are simultaneously used to clamp the metal plates together and pass the current through the metal plates. The advantages of this method include efficient energy utilization, limited workpiece deformation, high productivity, easy automation and no need for filling materials. The welding strength is obviously lower than that of other welding methods, making this process only applicable to some applications.

 

Seam welding relies on two electrodes to apply pressure and current to connect metal plates. The concept and design of low inertia seam welding aims to minimize the quality in the design of welding system. This is intended to increase the reaction time of the welding roller for maximum weld tracking capability. Seam welding improves the speed of welding joints and reduces the necessary welding pressure. Thin materials and materials with difficult connection characteristics can be welded more easily with consistent high quality.

 

Butt welding is a commonly used welding technology, which can be completed automatically or manually on steel parts. It is used to connect two pieces of metal together, such as pipes, factory frames, and flanges. Butt welding is accomplished by heating two pieces of metal, applying pressure, or both. When they are in the parent metal, full penetration butt welds are formed.

 

Friction welding is a solid state connection process that uses the heat generated by mechanical friction of two parts to connect large and small parts together. This process has many advantages over other welding processes, including the ability to weld a variety of different metals, the ability to avoid shielding gas or filler metal, and the ability to avoid certain welding defects common in fusion welding processes.

Rolling

Rolling is a metal forming process. Metal raw materials pass through one or more pairs of rolls to reduce the thickness, make the thickness uniform, and give the required mechanical properties. Rolling is classified according to the temperature of the rolled metal. If the temperature of the metal is higher than its recrystallization temperature, the process is called hot rolling. If the temperature of the metal is lower than its recrystallization temperature, the process is called cold rolling. In terms of application, the hot rolling process has more tonnage than any other manufacturing process, and the cold rolling process has the largest tonnage of all cold working processes.

Rolling

Rolling is a metal forming process. Metal raw materials pass through one or more pairs of rolls to reduce the thickness, make the thickness uniform, and give the required mechanical properties. Rolling is classified according to the temperature of the rolled metal. If the temperature of the metal is higher than its recrystallization temperature, the process is called hot rolling. If the temperature of the metal is lower than its recrystallization temperature, the process is called cold rolling. In terms of application, the hot rolling process has more tonnage than any other manufacturing process, and the cold rolling process has the largest tonnage of all cold working processes.

Rolling

Rolling mill is used to roll metal into plates, bars or special shapes with different sections. Rolling process is a deformation process, in which the metal in the form of semi-finished products or finished products passes between two opposite rollers, and the metal thickness is reduced through the compression process. When metal is squeezed between them, the rollers roll around the metal.

 

Rolling mainly includes the following types:

Roll forming, roll bending or plate rolling is a continuous bending operation in which long metal strips pass through continuous roll groups or racks, each group performing only the incremental portion of the bending until the desired intersection obtains the profile. Rolling forming is an ideal choice for the production of long length or large quantities of parts. There are mainly four roll, three roll and two roll processes.

Rolling

Flat rolling is the most basic form of rolling, and the starting and ending materials have rectangular cross sections. The material is fed between two rollers, which rotate in opposite directions. The gap between the two rolls is less than the thickness of the starting material, which will cause deformation. The reduction of the material thickness results in the elongation of the material. Friction at the interface between the material and the roll causes the material to be pushed through. The amount of deformation that may occur in a single pass is limited by the friction between the rollers. If the thickness changes too much, the roller will only slide over the material without pulling it in.

Rolling

Controlled rolling is a kind of thermal mechanical processing that integrates deformation control and heat treatment. The heat that makes the workpiece higher than the recrystallization temperature is also used for heat treatment, so no subsequent heat treatment is required. The types of heat treatment include producing fine grain structure, controlling the properties, size and distribution of various transformation products, inducing precipitation hardening and controlling toughness. In order to achieve this, the whole process must be closely monitored and controlled. Common variables controlling rolling include raw material composition and structure, deformation level, temperature at each stage and cooling conditions. The benefits of controlled rolling include better mechanical properties and energy saving.

Rolling

Forging rolling is a longitudinal rolling process, which reduces the cross sectional area of heated bars or billets by guiding them between two roll sections with opposite rotation. This process is mainly used to provide optimized material distribution for subsequent die forging processes. Therefore, it can achieve better material utilization, lower processing force and better part surface quality.

Application

Deze provides solutions for industrial filtration, separation, flow control, noise reduction, powder fluidization and other applications. Metal filter is a cutting-edge technology widely used in many industries. It has a variety of micrometers, metal materials and permeability.

Our products can be used in high temperature and corrosive environments. In harsh environments, accurate pore size, pore geometry and permeability characteristics are prerequisites for optimal filtration. They are widely used in:

  • aerospace
  • automotive
  • electric power
  • chemical
  • pharmaceutical
  • polymer
  • food and beverage
  • oil  
  • natural gas and other applications.

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