CN110549731A

CN110549731A - Printing machine and rubber roll

Info

Publication number: CN110549731A
Application number: CN201810612849.2A
Authority: CN
Inventors: 石强
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-05-30
Filing date: 2018-05-30
Publication date: 2019-12-10

Abstract

The invention provides a printing machine and a rubber roller, the rubber roller comprises a mandrel and a plastic part, and is characterized in that: a covering member is disposed outside the plastic portion. Due to the arrangement of the covering piece, if the covering piece is made of wear-resistant materials, the service life of the rubber roller can be prolonged. The covering part can be replaced before the covering part is worn and failed, and the service life of the rubber roller is prolonged.

Description

Printing machine and rubber roll

Technical Field

The invention relates to a printing machine and a rubber roller.

Background

The ink transfer process in offset printing is typically carried out by an ink fountain roller that transfers ink from the ink fountain to an ink transfer roller, and an ink distribution roller that spreads the ink from the ink transfer roller into a uniform film that is transferred to the plate via an ink form roller. The shortest path that one takes to deliver ink from the fountain, through the transfer roller, and to the form roller is called the ink path. The transfer of ink between the rollers is accomplished by contacting the ink layers on adjacent rollers and then separating them. The surface linear velocities of the ink rollers, distribution rollers, and form rollers in the inking unit are all the same, with the exception of the fountain roller and the ink transfer roller. The water roller and the ink roller are the last links of water supply and ink supply, and the quality of the working condition directly determines the quality of the printed product. The surfaces of the form roller and the dampening roller must have a high degree of flatness and the distribution of water and ink thereon must also be uniform. Some napped cloths or napped sleeves used on the water applying roller are degreased and have better hydrophilic performance. The water velvet sleeve has countless capillary pores and has extremely strong adsorption, so that the hydrophilicity and the water absorption performance of the water roller are ensured, and the water velvet sleeve can play a good role in wetting a printing plate. It can be said that water and ink should be in a "set" state on the surface of the form roller and form roller. The water and ink are positioned and then transferred to the printing plate, thereby ensuring the stability of the quality of the printing product. The water or ink path between the form roller and form roller allows some non-uniformity to exist, which can be compensated by the form roller and form roller, but the less non-uniformity the better. The key in the offset printing process technology is the control of the balance of a water path and an ink path, and the balance of ink and water is a key part of a rubber roller, so that the quality of the rubber roller can be directly acted on the product quality. This is especially true for gravure, embossing, and flexography. The printing industry generally maintains the equipment once a week, including the maintenance of the printing rollers. The maintenance method comprises the following steps: 1. after the production operation is finished every day, carefully cleaning the rubber roller, and repeatedly cleaning twice; 2. the printing rubber roller is cleaned by using a specified chemical preparation, such as industrial alcohol and the like, and a corrosive solvent can not be used at all; 3. the rubber roller needs to be taken down when a holiday rest, so that the rubber roller is prevented from being deformed under pressure; 4. the surface of the printing rubber roller is protected by wrapping newsprint and placing the newsprint in a ventilated shade. The printing rubber roller usually has the phenomena of abrasion, hole breakage and the like in the working engineering, and if the roller is replaced by a new roller, the manufacturing cost is too high and the production progress is influenced. Therefore, the rubber roller must be carefully cleaned in daily cleaning, otherwise the surface layer of the rubber roller, the pigment and the resin are oxidized to generate a smooth and hard film, and the surface is vitrified to influence ink transfer. If the rubber roller cannot be cleaned completely, the surface of the rubber roller is uneven for a long time and is not good for use. Therefore, the rubber roller is cleaned and put for standby when the machine is stopped. Ink emulsification occurs during offset printing operations due to "water large ink" forming a hydrophilic base on a smooth rubber roll, which allows it to be deinked. The solution is to shovel off the emulsion ink, wash the deinking rubber roller with gasoline, mix 5% sodium hydroxide solution with pumice powder and polish, and at the same time, treat the metal roller (or hard roller) correspondingly. The hard roller can be polished by fine water sand in a water sprinkling state, and the hard roller can not be fixed and stay at the same position, otherwise the rubber roller can be damaged. The basic method is to control the pH value of the fountain solution and make the ink balance good. The rubber roller is aged after being used for a long time, and is corroded by chemicals to cause the rotten rubber to drop 'slag', and the rubber roller is preferably not used, otherwise, the quality of the printed product is seriously influenced.

Disclosure of Invention

The invention mainly aims to provide a rubber roller which can prevent rotten rubber from falling off slag in time and prolong the service life of the rubber roller.

The main purpose of the invention is realized as follows: the rubber roller comprises a mandrel and a plastic part, and is characterized in that: and a covering part is arranged outside the plastic part.

The core shaft is provided with a covering part fixing seat, and the covering part is fixed on the covering part fixing seat.

The covering part is a circular tube part.

The covering part is made of silica gel.

The covering piece is made of metal materials.

The metal material is stainless steel material.

The thickness of the covering part is less than 0.1 mm.

The surface roughness of the covering part is more than 12.5 um.

A method for manufacturing a thin-wall metal pipe by using a metal pipe is characterized by comprising the following steps: sleeving the hole of the metal pipe on a roller of a double-roller mill with adjustable space; starting the twin roll mill while reducing the twin roll gap.

The printing machine comprises the rubber roller.

Drawings

The invention will now be further described with reference to the accompanying drawings.

FIG. 1 is a front view of a first embodiment of the glue roll of the present invention.

FIG. 2 is a view from direction A-A of a first embodiment of the glue roll of the invention.

FIG. 3 is a view from the B-B direction of the first embodiment of the glue roll of the invention.

Fig. 4 is a front view of a cover of the first embodiment of the present invention.

Fig. 5 is a left side view of the cover of the first embodiment of the present invention.

Fig. 6 is a front view of a cover fixing base according to a first embodiment of the present invention.

FIG. 7 is a front view of a second embodiment of the glue roll of the invention.

FIG. 8 is a view from the C-C direction of a second embodiment of the glue roll of the invention.

FIG. 9 is a front view of a third embodiment of the glue roll of the present invention.

Detailed Description

Example 1

As shown in fig. 1-6, a cover fixing seat (03) is fixed on a mandrel (01), a threaded hole is formed in the cover fixing seat (03), the cover fixing seat (03) is locked on the mandrel (01) by a locking screw (02), a cover (04) is fixed on the cover fixing seat (03), the cover (04) is in a semicircular tube shape, and 2 covers with the same shape cover the whole excircle part of a plastic part (05) from top to bottom. The covering part (04) is provided with a protruding part (06) which is inserted into an inserting hole (07) on the covering part fixing seat, so that the covering part (04) can be fixed and the rotating torque can be transmitted. The cover may be in the shape of a one third circular tube, with 3 covers covering the entire outer circular part of the plastic part (05). When the thickness of the cover member (04) is thin, the protruding portion (06) needs to be thickened in order to have a sufficient strength to transmit torque. The covering piece (04) can be made of metal material, such as stainless steel or copper, and is bent into a circular arc shape to be suitable for the outer diameter of the rubber roller. When a metal material with high hardness is used, the influence of rigidity can be ignored when the thickness of the metal material is very thin, the covering part only plays a role of wear resistance, and the dimensional accuracy can be kept for a long time. The outer shape of the cover member may also be formed using a rolling machine.

Example 2

As shown in fig. 7-8, the covering member (13) is a closed circular tube, which may be a silicone rubber tube. The silicone rubber tube is firmly fixed on the plastic part of the rubber roller by using the elasticity of the silicone rubber tube. Epoxy may also be used to secure the two together. The cover may be a plastic tube of other material.

Example 3

As shown in fig. 9, the mandrel (01) is provided with a fixing hole (08), and the covering member (10) is made of a stainless steel plate and comprises an inserting portion (09), a winding portion (11) and a positioning portion (12). The inserting part (09) is inserted into the fixing hole (08), the positioning part (12) extends out of the fixing hole (08) and limits the position of the left side of the covering piece (10) through bending, the winding part (11) wraps the plastic part (05) in a spiral mode in a split pin-like mode, the inserting part and the positioning part which are similar to the left side are arranged at the position of the right side of the covering piece (10) to play a positioning role, and the fixing hole which is similar to the left side is formed in the right side of the mandrel (01). When the covering part (10) is worn, it can be replaced. When the covering piece is too thin, the fixing can be carried out in a knotting mode. The wire for the covering member is a flat wire.

The covering part can be a part of an unsealed round tube, and is equivalent to a round tube formed by bending a steel plate. The diameter of the circular tube can be slightly smaller than that of the plastic part of the rubber roller, so that the circular tube can be clamped on the plastic part of the rubber roller through elasticity. Epoxy may also be used to secure the two together.

When the covering piece is made of metal materials, the thickness of the covering piece depends on the actual use condition, and if the rubber roller is required to have a wider contact surface, the thickness is required to be thinner so as to reduce the influence of the rigidity of the covering piece.

The plastic part of the rubber roller can adopt natural rubber, chloroprene rubber, butyl rubber, polyurethane, silicon rubber, fluorine rubber, nylon and the like in different occasions. The mandrel portion may be cast iron, stainless steel, etc.

Surfaces that are too smooth are not conducive to wetting, so the surface of the cover can be roughened by sandblasting or chemical etching, and the surface roughness of the cover is greater than 12.5 um.

The rolling mill comprises a base, rollers and a driving device, wherein for rolling metal, hot rolling or cold rolling can be adopted, namely 2 rollers capable of rotating are used, the rollers are driven by a reducer driven by a motor, the gap between the 2 rollers is smaller than the thickness of a rolled product raw material to enable the rolled product raw material to deform, and the gap between the 2 rollers is adjusted from two ends through a screw rod nut device synchronously driven by the motor. The rubber roller is sleeved on the plastic part of the rubber roller after being manufactured, the plastic part can be cooled firstly to reduce the shrinkage diameter of the rubber roller, the covering part is heated to 100 ℃ to increase the diameter of the covering part, and then the assembly is completed. A round tube of smaller diameter can be obtained by hot rolling.

The metal pipe can be sleeved on the plastic part of the rubber roller, the plastic part can be cooled firstly to reduce the shrinkage diameter of the rubber roller, the covering part is heated to 100 ℃ to increase the diameter of the covering part, then the assembly is completed, and then the cylindrical grinding machine is used for grinding, so that the thickness of the covering part is reduced. However, this method may not result in a thin-walled cover.

The covering member may be formed by welding thin steel plates into a pipe shape by roll welding, and the butt joint portion has a repeated plate thickness.

The cover may also be formed by directly epoxy bonding a thin-walled metal plate to the plastic portion of the rubber roller.

A downward projection may be made on the covering of metal material using a stamping process to increase the anti-slip properties. Chemical etching methods may also be used.

Claims

1. The rubber roller comprises a mandrel and a plastic part, and is characterized in that: and a covering part is arranged outside the plastic part.

2. Rubber roll according to claim 1, characterized in that: the core shaft is provided with a covering part fixing seat, and the covering part is fixed on the covering part fixing seat.

3. Rubber roll according to claim 1, characterized in that: the covering part is a circular tube part.

4. Rubber roll according to claim 3, characterized in that: the round pipe part is a closed round pipe part.

5. Rubber roll according to claim 1, characterized in that: the covering piece is made of metal materials.

6. Rubber roll according to claim 5, characterized in that: the metal material is stainless steel material.

7. Rubber roll according to claim 1, characterized in that: the thickness of the covering part is less than 0.1 mm.

8. Rubber roll according to claim 1, characterized in that: the covering member is a wire spirally wound around the plastic portion.

9. A method for manufacturing a thin-wall metal pipe by using a metal pipe is characterized by comprising the following steps: sleeving the hole of the metal pipe on a roller of a double-roller mill with adjustable space; starting the twin roll mill while reducing the twin roll gap.

10. A printing press, characterized by: comprising a rubber roller according to claim 1.