Opening ratio of punching mesh

The opening ratio refers to the ratio of the area of holes to the total area of the plate, which can be expressed as a percentage. You must pay attention that the pressure of the punching equipment can cause the deformation of the plate, and the larger the opening ratio, the more obvious the deformation of the plate, especially if the four corners are not left. This kind of deformation can be leveled by the leveling machine in our workshop, so you also need to put forward to us after careful consideration of the special requirements for leveling.

Perforated net edge

The margin refers to the non-punching area on the edge of the sheet. Typical orifice plates have long sides that need to be trimmed. If you have special requirements, you need to provide us with the dimensions of the four sides. Edges may be affected due to manufacturing. If it is not suitable for your requirements, we will provide similar products with your consent.

Perforated plate tolerance

Punched products are allowed to have certain tolerances in thickness, edge distance, opening ratio, flatness, etc. Like the manufacturing process of other products, the stricter the tolerance requirements, the higher the corresponding production cost. So you need to determine the specific tolerances of your product so that you can get a satisfactory product.

Inclined sieve (curved sieve) is a new generation of fiber recycling equipment developed by introducing foreign new technology. The equipment has no rotating and vibrating parts, no power transmission, and is easy to operate. Inclined screens are used in solid-liquid separation systems such as white water filtration, fiber recovery, pulp concentration, waste paper deinking and cleaning in the paper industry, as well as screening equipment in the production processes of textile printing and dyeing, food, brewing and sugar industries. It is a widely used, energy-saving water treatment equipment.

The inclined screen uses the external pump to send the fluid material into the curved screen, and relies on the centrifugal force and gravity of the water flow to separate solids and liquids during relative shearing motion with the screen to achieve the purpose of screening. At the same time, the solid matter accumulated on the net rolls down with the help of the liquid flow, and the liquid continuously scours the sieve grid to make it self-cleaning, thus completing the whole process of continuous self-cleaning of the sieve and continuous collection of solid matter. The automatic cleaning water device can automatically clean the sieve plate with high pressure to avoid the possibility of clogging the sieve plate. The overall stainless steel structure has strong environmental applicability and avoids the possibility of corrosion.

In the paper industry, it can be used in the following applications:

1. Fiber recovery - treatment of white water in various pulping and papermaking processes to recover fibers

2. Concentration of stock - screening and purification system Concentration of good stock and tailing stock - Concentration of broken pulp

3. White water purification - paper machine white water purification for spraying water - paper machine press water purification and reuse

4. Fiber classification - long and short fiber classification - separation of large fiber bundles

5. Fiber/Filler Separation - Deinked Pulp Washing - Coated Broken Pulp Washing

6. Sewage treatment - removal of solid suspended matter

Classification of commonly used slit screens

Common slit screens (sieve plates) are classified by material, generally there are three types

1 stainless steel slotted sieve plate

2 Polyurethane two-component dehydration sieve plate

3 Polyurethane three-component screen

Stainless steel slotted sieve plate, product classification: stainless steel welded mine screen, slotted sieve, sieve plate sieve basket, welded vibrating screen, cylinder screen, curved screen.

Product features: easy to leak, wear-resistant, corrosion-resistant. The mesh section is trapezoidal. The gap is narrow at the top and wide at the bottom. Widely used in mining, coal, petroleum, fertilizer, grain, salt, environmental protection and other industries.

Stainless steel welded slit screen is a metal mesh structural element used for screening and filtering. Widely used in screening, filtration, dehydration, desliming and other operations in many industries. It has high strength, rigidity and bearing capacity, and can be made into rigid screening and filtering devices of various shapes.

Effect of wedge wire screen on isocyanate index. The isocyanate index refers to the molar ratio of polyisocyanate to oligomeric polyol. In the synthesis of prepolymer, the closer the NCO/OH ratio is to 1, the greater the viscosity of the prepolymer and the difficulty in pouring. When the NCO/OH ratio exceeds 2, the viscosity of the prepolymer will decrease significantly, and it is easy to produce branching reaction or free isocyanate, the storage stability will decrease, and a large amount of isocyanate gas will volatilize during operation, which is harmful to health and pollutes Air. The ratio of NCO/OH is generally selected between 115 and 212, because within this ratio range, the viscosity of the prepolymer is moderate, the defoaming operation is easy, and the overall performance of the product is better.

Effect of wedge wire screen reaction temperature Increasing the mixing temperature of prepolymer and chain extender can improve the compression deformation performance, but the tensile strength and tear strength will decrease, and the life in the kettle and gel time will be shortened. too low mixing temperature

Effect of NCO content in wedge wire screens. The NCO content is an important index to characterize the quality of the prepolymer, and it is also an important basis for calculating the amount of chain extender.

The higher the content of the prepolymer, the lower the viscosity of the prepolymer, which is easy to defoam and mix, and the corresponding product hardness, strength and modulus are higher, but the life in the kettle is shortened, and the lower the content of the prepolymer, the product hardness, The strength and modulus are reduced, the viscosity is increased, and the life in the kettle is prolonged

The effect of wedge wire mesh molecular weight. The relative molecular mass of the oligomer polyol determines the density of the neutral group of the polyurethane elastomer. With the increase of the relative molecular mass of the oligomer polyol, the physical properties of the polyester polyurethane elastomer improve and the hydrolysis resistance decreases. With the increase of the relative molecular weight of oligomer polyols, the flexibility and hydrolysis resistance of ether polyurethane elastomers will increase, but the tensile strength and modulus will decrease.

Influence of Compounding Agents for Wedge Wire Screen In the production process, in order to increase the reaction speed, improve the processing performance and product performance, and reduce the cost, a small amount of accelerator is added if necessary to enhance its physical and mechanical properties.

On the one hand, solid chain extenders are not allowed. On the other hand, although it is beneficial to prolong the life of the kettle and improve the physical properties, it is not easy to degas and mix unevenly, so only a moderate temperature range can be used in actual operation.

Wedge wire is a welded steel structure primarily used for filtering, separating and retaining media.

Wedge wire screens feature continuous V-groove wires that provide more open area per square foot of screen than other traditional methods, allowing more water inlets and outlets for greater efficiency.