Rubber Screen Panels Plate
Rubber Screen Panels Plate is a kind of rubber lining plate. Embedded metal skeleton has the same specifications sheet, holes are uniformly distributed on the small noise, has good abrasion resistance. Is the main component of vibrating screen, Rubber Sieve Screen Plate mainly used for coal ore sorting grading, etc., Rubber Sieve Screen Plate are widely used in coal mine selection industry.
Rubber Screen Panels Plate Structural Design:
The design of the structure includes: glue layer, skeleton layer, hole shape, bore diameter, and use the tension hook to connect with the screen machine, fixing method and so on.
Rubber Screen Panels Plate Formula Design:
Wear resistant Rubber Screen Panels Plate adhesive glue and glue brush cover. As the matrix material of polyester cord, the adhesive properties of similar polyester canvas. Therefore, choose polyester canvas glue for plate rub rub adhesive with good results. Rubber Sieve Screen Plate conditions require the use of it has good abrasion resistance, high strength, good elasticity, resistance impact and tear resistant properties. Therefore, determining the coverage formulation principle: high abrasion resistance, high strength, moderate elasticity, good processing performance.
Rubber Sieve Screen Plate Process study:
In order to meet the special use environment and complex load conditions of Rubber Sieve Screen Plate, the following are summarized: plasticization, mixing, rolling, pre forming, vulcanizing
Rubber Sieve Screen Plate Characteristic:
Wear resistant Rubber Sieve Screen Plate in screening equipment, compared with the metal sieve plate, there are several main features:
Highly wear-resistant Rubber Sieve Screen Plate can absorb the impact. so have excellent wear resistance. Under normal circumstances, wear resistant Rubber Sieve Screen Plate having a working life of more than 4-8 times higher than the metal plate.
Wear Rubber Sieve Screen Plate with low noise and less dust: On the basis of field investigation, machine wear rubber plate than metal plate can reduce the noise by 5-20 dB in the same screen, and can significantly reduce the dust flying, the workshop to get a quiet and clean working environment.
Wear Rubber Sieve Screen Plate the proportion of small: easy to install, easy to disassembly and transportation. The weight of 1 square meters of Rubber Sieve Screen Plate of 15mm thickness is less than 15Kg, can reduce the weight of equipment itself, and a corresponding reduction in the power machine consumption.
Due to the structure of Rubber Sieve Screen Plate: which has the properties (i.e. mesh relaxation, under external force there is a periodic variation in small aperture), and the Rubber Sieve Screen Plate is an inverted cone, so it is not easy to hole blocking, has good self purification ability.
High screening accuracy of Rubber Sieve Screen Plate: because the Rubber Sieve Screen Plate is made of special shaped cutting tools at one time, so the size is accurate, with a Rubber Sieve Screen Plate can not have screening accuracy.
Material Used for Rubber Lining of Piping System
Rubber linings are mainly used for protection against corrosion and/or erosion damage.
A wide range of rubbers and elastomers are available for lining vessels, tanks and piping.
Rubbers can also be made with anti-static properties to give a low surface electrical resistance.
Hard rubbers, i.e. hardness greater than Shore D 60, can only be applied by autoclave vulcanization, and therefore hard rubber lining is restricted to small equipment or components. Only soft rubbers can be applied on site.
Hard rubber linings can only be applied to rigid structures and they are also sensitive to large temperature fluctuations. Soft rubber linings remain elastic over a large temperature range, and consequently they can accommodate major deformation, vibrations and significant temperature changes.
With respect to safety aspects, pressure rating, etc. the regulations which apply to piping, equipment and structures are also valid for rubber-lined systems.
Material Selection
Material selection is determined by:
- service conditions (pressure, temperature, medium, etc.)
- design
- manufacturing method
The following rubber types are used for lining purposes (classification according to ASTM D 1418):
- Isoprene or natural rubber (NR)
- Synthetic isoprene rubber (IR)
- Styrene-butadiene rubber (SBR)
- Chloroprene rubber (CR)
- Butyl rubber (IIR)
- Broom-butyl rubber (BIIR)
- Chloro-butyl rubber (CIIR)
- Nitrile-butadiene rubber (NBR)
- Ethylene propylene rubber (EP, EPDM)
- Urethane rubber (UR)
- Chlorosulphonated polyethylene (CSM)**
- Fluoro elastomer (FKM)*
* Commercially available under trade name "Viton" (DuPont product)
** Commercially available under trade name "Hypalon" (DuPont product)
Depending on the degree of vulcanization, rubbers can be classified as 'soft' rubber or as 'hard' rubber. The hardness of soft rubbers is expressed in Shore A, and the hardness of hard rubbers is expressed in Shore D (ASTM D 2240).
Hard rubbers (or Ebonites), i.e. with a hardness higher than Shore D 60, can be produced from NR or blends, e.g. NR/IR, NR/SBR and NR/IR/SBR.
Properties of Rubber
Each rubber material has a specific limit in terms of allowable service temperature and chemical resistance. The chemical resistance and temperature limits for continuous service of several rubber types are given below.
1. Natural rubber (NR)
Soft and hard natural rubber linings are suitable for handling most inorganic chemicals, with the exception of strong oxidising agents such as chromic and nitric acids. Natural rubber linings are also suitable for handling hydrochloric acid. Natural rubber is also resistant to most organic fluids, including alcohols and most esters. They should not be used in the presence of aliphatic or aromatic hydrocarbons, halogenated hydrocarbons, mineral oils and certain vegetable oils. The allowable service temperature range is -40 °C to +80 °C.
The bond strength of NR linings on steel is excellent. The hardness is typically Shore A 55 for soft rubber and Shore D 75 for hard natural rubber.
2. Synthetic isoprene rubber (IR)
Isoprene rubber is a synthetic alternative form of NR, and has similar properties.
3. Styrene-butadiene rubber (SBR)
Styrene-butadiene rubber can be used for the containment of automotive brake fluids, alcohols and mixtures of alcohol and water. The allowable service temperature range is -30 °C to +80 °C. The hardness is in the same range as that of soft natural rubber (NR).
4. Chloroprene rubber (CR)
Chloroprene rubber is resistant to ozone and sunlight, and reasonably resistant to oils and chlorine. Special compounds are suitable for use with refrigerants (e.g. Freon 12 and 22).
The allowable service temperature range is -30 °C to +105 °C. Hardness is approximately Shore A 60.
5. Butyl rubbers (IIR, BIIR, CIIR)
Butyl rubbers have excellent tolerance to hydrochloric acid. Butyl rubber is resistant to ozone and sunlight, non-flammable hydraulic fluids, animal and vegetable oils, water, alcohols, ketones and acids. Butyl rubber should not be used in the presence of free halogens, petroleum oils or halogenated or aromatic hydrocarbons. The allowable service temperature range is -30 °C to +110 °C. Hardness is in the range of Shore A 55 to A 60.
6. Nitrile butadiene rubber (NBR)
Nitrile butadiene rubber (also known as BuNa-N) is a copolymer of butadiene and acrylonitrile. The acrylonitrile content must be at least 35% by mole to obtain good chemical resistance. Nitrile rubbers are resistant to petroleum-based hydraulic and lubricating oils, animal and vegetable oils, acetylene, alcohols, water, alkalis and fuel oils. Nitrile rubber should not be used for phenols, ketones, acetic acids, most aromatic hydrocarbons and nitrogen derivatives. The allowable service temperature is -35 °C to +80 °C. Hardness is approximately Shore A 60.
7. Ethylene propylene rubbers (EPDM / EPM)
Ethylene propylene rubbers are resistant to ozone and sunlight, oxidizing chemicals, non-flammable hydraulic fluids, pure aniline, fire extinguisher liquids, acids, hot water and steam. However, these rubbers are not resistant to mineral oils, petrol solvents and aromatic hydrocarbons. The allowable service temperature range is -40 °C to +150 °C. Hardness is typically in the range Shore A 40 to A 80.
8. Urethane rubber (UR)
Urethane rubber has excellent wear/erosion resistance and is chemically resistant to mineral oils, fuels and ozone. Urethane rubber should not be used for concentrated acids, ketones or chlorinated hydrocarbons, and shall not be used for water above 50 °C.
Otherwise, the allowable service temperature range is -40 °C to +70 °C. Hardness is typically in the range Shore A 50 to A 80.
9. Chlorosulphonated polyethylene (CSM)
Chlorosulphonated polyethylene is a highly wear-resistant synthetic rubber with excellent resistance to heat, ozone sunlight, oxidising media, sodium hypochlorite and sulphuric acid.
CSM rubber has also good resistance to most oils, lubricants and aliphatic hydrocarbons, but is unsuitable for use with esters and ketones. The allowable service temperature range is -35 °C to +80 °C. Hardness is approximately Shore A 60.
10. Fluoro-elastomers (FKM)
Fluoro-elastomers are copolymers of hexa-fluoro-propylene and vinyldiene fluoride. They are suitable for both high-temperature and vacuum applications. These materials have excellent resistance to oils, fuels, lubricants, carbon tetrachloride, most concentrated acids and many aliphatic and aromatic hydrocarbons such as toluenes, benzene and xylene.
They should not, however, be used with low molecular weight esters and ethers, ketones, certain amines and hot anhydrous hydrofluoric or chlorosulphonic acids. These materials are also resistant to ozone and sunlight and can be used in contact with many corrosive gases, e.g. bromine and chlorine. However, they are not resistant to ammonia or highpressure steam. The allowable service temperature range is -20 °C to +230 °C. Hardness is typically in the range Shore A 60 to A 90.
