High quality printing rubber roller

High quality printing rubber roller

First, the definition and classification of cots

 

1, the definition of rubber roller:

Metal or other materials as the core, coated with rubber made of vulcanized roll products.

 

2, Category:

According to the surface morphology can be divided into flat roller and rubber roller pattern.

According to the material can be divided into butyl rubber roller, nitrile rubber roller, polyurethane rubber roller and silicone rubber roller.

Can be divided into paper cots, printing and dyeing Cots, printing Cots, Cushion Cots, metallurgical Cots and offset rubber Cots.

Generally by the outer plastic, hard plastic layer, metal core, roll neck and vent composition.

Its processing includes roll core sandblasting, adhesive treatment, plastic molding, cloth, wire wrapping, vulcanizing and vulcanizing the surface of the process.

Cots are mainly used in papermaking, printing and dyeing, printing, food processing, metallurgy, plastic processing and so on.

 

Second, the performance of different materials cots comparison

 

1, Neoprene roller: Cots of this type of roller has excellent wear resistance, high fire resistance, oil resistance, aging resistance, good heat resistance, and acid and alkali, can be made into printing plastic Roll, iron roll, tanning roll, coating roll and the like. For PCB etching machine, plastic, leather, printing, printing of food stamps, general coating machines and other equipment.

 

2, C rubber roller: has excellent resistance to ozone aging, weather resistance, long-term use at -65 ℃ -140 ℃ ambient temperature, excellent insulation properties, the roller can be used in plastic printing machinery, leather machinery Other common areas. Cots roller factory, printing roller more commonly used.

 

3, natural rubber roller: Such rubber roller has excellent elasticity and mechanical strength, good alkali resistance, commonly used in papermaking leather, textile, packaging and other equipment in the compression roller and metallurgy, mining and other industries traction plastic Roller.

 

4, Fluorine rubber roller: with high heat, oil, acid and other properties, resistance to gas permeability, electrical insulation, anti-aging, flame resistance, wear resistance and other properties are also very good, for special coating equipment .

 

5, polyurethane rubber roller: hardness 30 ° ~ 100 °, with exceptionally high mechanical strength and wear resistance, corrosion resistance, aging resistance and oil resistance, commonly used in metallurgical industry, paper polishing paper, chemical fiber, wood Processing, plastic processing, India and other machinery polished metal. High-level printing Cots, printed iron roller, metallurgical roller commonly used.

 

6, Silicone Rubber Roller: The roller mill uses its high temperature resistance, high pressure resistance, ozone resistance, chemical inertness and non-adhesiveness to plastics for processing hot-stick products such as polyethylene calendering, embossing, printing and dyeing And fabric coating adhesive, plastic composite, corona treatment and other machinery, but also for sugar production and packaging machine release rolls and non-woven fabric manufacturing.

 

Third, what are the performance characteristics of rubber roller?

 

1, excellent resistance to ozone aging, oxygen aging, photoaging and weathering performance. Rubber vulcanized in the free state after a few years of outdoor exposure, no significant change in performance.

 

2, high temperature: rubber roller is a heat-resistant rubber roller. Among the various rubbers, it has the broadest operating temperature range (-100 degrees to 300 degrees).

 

3, excellent electrical insulation properties: After the rubber roller vulcanized electrical insulation in the damp, water or temperature changes in small changes, the combustion of silicon dioxide is still generated after the insulation, which will ensure that the electrical equipment to continue Work until repair.

 

4, rubber roller at the same time with oil, resistance to radiation, combustion and other properties.

 

5, high pressure, deformation recovery is good.

 

6, using an exclusive special curing process, longer life expectancy.

 

7, first-class flexibility, good toughness.

 

8, fast thermal conductivity, excellent thermal conductivity.

 

9, good wear resistance, easy to cut.

 

Fourth, the production of plastic roller knowledge

 

The main raw materials: rubber gum, curing agent, plasticizers, fillers, accelerators.

The main process and role: Mixing - filtration - curing treatment - grinding - polishing.

 

(1) Mixing: The content of each component is controlled, the temperature of hot baking, etc., so that the hardness and composition are stable.

(2) Filtering: make the colloid even without impurities. This is especially important for high-speed presses: uniform stress and high energy transfer at high speeds maintain uniformity when expanded or shrunk due to a variety of factors, so reliance on adjustments can reduce or eliminate adverse effects.

(3) Curing: Stabilizing the speed-increasing agent through heating and pressurizing and vulcanizing, so that the rubber shrinks to the minimum extent by external force. Will be soft and ductile compounds into a solid, but have a certain degree of softness of the material, which is more suitable for ink transfer and transfer.

(4) grinding and polishing: the key to determine the size accuracy and surface area of the roller, especially the curvature of alcohol water roller treatment. The rubber surface looks smooth, but under high magnification, there are many tiny raised and recessed parts. These raised and depressed portions increase the surface area of the cot and make it superior in ink transfer and transfer performance.

 

Fifth, the use and characteristics of polyurethane rubber roller

 

Polyurethane rubber roller is the use of polyurethane as raw materials, and then processed through different processes made of fine materials. Its bright surface color, dimensional stability, whether it is under high temperature or low temperature will not produce deformation, in addition, it also has super viscosity, in many industries and fields have great use.

 

Polyurethane rubber roller as a powerful material in all walks of life are very wide range of uses, but also for different industries to create greater value. Polyurethane rubber roller can be used for printing in different environments, to ensure the quality of printing; can also be used for gasoline, kerosene, lubricants and other solvents; polyurethane rubber roller in the paper industry, textile industry, printing and dyeing industry, the steel industry is also very useful A wide range, and their demand for polyurethane rubber roller is very large.

 

1, polyurethane roller has excellent hydrophilicity, can be used as water, alcohol and other dampening system roller use.

 

2, the polyurethane surface of the rubber roller bonding strength, can be a solid material bonded with the heart curse.

 

3, polyurethane roller hardness indicators are very broad, able to adapt to different types of machines to meet different needs of eating.

 

4, polyurethane rubber roller good chemical properties, excellent physical properties, not easy to old and worn, will not harden, long service life.

 

Six, a variety of printing roller know in detail

 

1, the introduction of printing roller:

 

Such cots have moderate hardness and elasticity, high oil resistance, resistance to wash solvents, abrasion resistance and shape stability. Soft roller generally use SBR, CR and PU production. Hard surface of the original copper material later replaced by polyester resin.

 

2, storage methods:

Printed rubber roller storage, to support the shaft storage, non-extrusion stacked, roller spacing should not be less than 5mm.

 

3, pay attention to matters

 

A, handling moving, to be carried, hanging shaft Department, to prevent the glue knock, touch, scratch.

B, the new roller temporarily do not, please do not remove the wrapping paper, wrapping paper can play a protective role.

C, over-sized storage of printing roller, the printing roller should be checked before use without title on the machine.

D, printing roller maintenance

 

In the offset printing technology, the key is the balance of waterway and ink path, while the balance of ink and ink is the key component of rubber roller and ink roller. The quality of the ink can directly affect the product quality. Gravure, letterpress, flexo even more so. The general printing companies to maintain equipment once a week, including printing cots maintenance. Maintenance methods are the following:

A. Every day after the completion of production operations should be carefully cleaned cots, washed twice;

B, cleaning the printing roller must use the specified chemical agents, such as industrial alcohol, must not use corrosive solvents.

C, holidays to take off the rubber roller to prevent compression deformation;

4, for the protection of printing roller surface should be taken newsprint wrapped, dark place ventilation.

 

4, printing roller repair

 

A, surface treatment: touch the hair to be repaired, clean, decontamination, degreasing, and dry.

B, with plastic repair, the rubber repair curing agent B group into the main group A group of iron rapid averaging (A: B = 1: 1), and then poured to be patched flat

C, curing: curing at room temperature 4-6 hours can be used, 48 hours to achieve maximum intensity.

 

Seven, the use of rubber roller and storage:

 

1, the new cast rubber roller should not be put into use immediately. The new rubber roller should be placed for a period of time, the rubber roller in contact with the external environment temperature and humidity, to maintain a relatively stable state, which can increase the toughness of the colloid, thereby enhancing the durability effect. The company is located in:

2, the correct storage of idle roller. To be used after the cots should be cleaned, the plastic film sealed with plastic, on the rubber roller frame, must not be stacked just a few or easily by the wall next to the vertical, so as not to make the colloid suffer undue losses .

3, rubber roller shaft, bearings should maintain a good lubrication. Usually should be diligent to the rubber roller shaft, bearing lubrication, to prevent the normal use of rubber wear parts, to ensure print quality.

 

Eight, a variety of rubber roller failure introduction

 

1, Cots surface crystallization, calcification: high-quality surface of the roller should be fine, smooth, feel a little sticky, with good ink performance. Production, long-term by the fountain Cots, inks, paper and other factors, combined with each cleaning can not be very thorough, the accumulation of impurities deposited layer by layer on the surface of the roller, over time, it will close the original roller surface Of the pores, the formation of a smooth calcium-like crystalline layer, a serious impact on ink transfer, water transfer performance, can not be stable control of print ink. In this regard, after each wash with car wash water, then use citric acid to wash it again, so that some of the surface of the roller calcium impurities chemical reaction to form a soluble material for cleaning.

 

2, easy to scratch the surface of the rubber roller, hemp eye: Because the rubber roller is relatively soft, the hard material in the high-speed operation will be scratched, especially the alcohol fountain solution by version of the water roller, scratches Can not be used again. To avoid such failures, one is to check whether the plate is tightened or clamping folder, causing the plate drag and cracks at the cracked by the water roller, ink roller; the second is to see if the ink roller maintenance is not timely, Ink, ink residue and other impurities accumulate more accelerated cot friction, heat, aging, so that the surface of the rubber roller hemp, this situation generally more serious roller rubber.

 

3, Cots premature chapped, aging: for many reasons, such as excessive drying oil in the ink, so that the ink dry on the roller heat; cleaning roller with improper choice of cleaning agent, cleaning time is too hasty, roller Impurities can not be thoroughly cleaned; workshop ambient temperature is higher, dampening cooling system is not working properly, a large number of heat generated when the roller operation can not be distributed in time, the inner temperature of the rubber roller is high; Cots roller bearing performance is poor, With rotation, resulting in beating friction, extrusion and so on.

 

4, deinking: In the offset printing operation because of "large watery ink" resulting in emulsion, the formation of a smooth roller on the basis of hydrophilic, will appear deinking phenomenon. The solution is to shovel the emulsion ink, the deinking roller with gasoline wash, with 5% sodium hydroxide solution and talcum powder surface grinding to remove the hydrophilic layer, so that the ink roller restore lipophilic properties. At the same time on the metal roll (or hard roll) also do the appropriate treatment. Hard roller can also be in the water pouring state, with fine sand grinding, can not be fixed in the same place, otherwise it will damage the rubber roller. The fundamental solution is to control the pH value of the liquid water, do a good job ink balance, reduce the degree of emulsion ink.