A method of making an elastic roller for a printing mechanism


B41D3/08 - Moulds, e.g. horizontal, for casting tubular, i.e. cylindrical, plates

 

(57) Abstract:

The invention can be used mainly in woodworking, as well as printing, textile, etc. industry. The objective of the invention is to increase the durability of the elastic roller due to the strong attachment axis. The problem is solved due to the fact that in the method of manufacturing an elastic roller for the printing mechanism by making the mandrel elastic roller, fill in a cylindrical shape plastisol in the form of polyurethane compositions with one or two sides through the Central opening of one or two caps with the front sides of the cover in the form of injected axis with the supporting pins, fill the plastisol, the protruding axle skewer the cover and tighten it with the case, in accordance with the invention, axle before filling the form is applied to increase the adhesion to metal bonding material such as PVC with a thickness of 5-7 mm and then heated to 100-120C. In this way, die-casting can be performed simultaneously with vibration, the intensity of which depends on the viscosity of the plastisol. 1 C.p. f-crystals, 1 Il.

The method relates to an elastic rollers used in printing, text is imitating natural wood picture directly on the DVP.

In the form of elastic rollers can be used dyeing, presser, rolling, long, etc. cushions.

Due to the stretchy work surface is achieved uniformity of the applied dye substances not smooth sheet material, such as DBL. In addition, the flexible cushion provides a natural clamp and friction.

In printing known in addition to metal, chrome, etc. rollers rollers with external compressible layer, in particular the transfer roller with a rubber sheath worn on a thin tube, which is mounted on ball bearings on the core roller /1/.

Due to the high friction rubber has a high feed properties, but has a low ability to compensate for the uneven surface of the sheet material during application of the paint.

Known roller for printing mechanisms, such as colorful, printed, guide, moisturizing or transporting used in machines for printing Newspapers, containing a Central shaft made of plastic and an outer casing is also made from plastic.

The shaft ends are closed by metal sleeves /2/.

Known roller does not create dostatochnoy outer cylinder on the rod roller, covered with a layer of compressible material. Between the inner surface of the cylinder and the outer surface layer is pressurized and injected the substance /3/. Stick to the compressible layer cylinder can automatically change the depth, but not suitable to compensate for irregularities in sheet material, such as fiberboard.

Known roller used for the manufacture of paper, calendering, zonal dispensing and supply of humidified solution on the plate cylinder. The platen consists of a fixed core that is installed on envelopes bearing element elastic shell, "floating" through the thin oil film on the bearing element and rotatable relative to the core /4/. The platen is connected to the counter-pressure roller, for example, doctorname roller printing machine for zonal dosing and delivery of the fountain solution or ink on the plate cylinder.

Known roller is complex in design and manufacture and does not compensate for the unevenness of the surfaces of sheet material such as fiberboard.

Known closest to the claimed technical solution is selected as the closest analogue of the method of making an elastic roller for a printing mechanism potamophila with one or two sides, through the center hole of one or two covers from the end of the parties, with the cover in the form of injected axis with the supporting pins, fill the plastisol, the protruding axle skewer the cover and fasten it with the case /5/.

The disadvantage of this method is weak adhesion to metal plastisol, which can lead to rapid failure of the roller. This weak adhesion may partly be caused by the presence of pores and bubbles in the molded mass.

The objective of the invention is to increase the durability of the elastic roller due to the strong attachment axis.

The problem is solved due to the fact that the use of signs known method of manufacturing a mandrel elastic roller for the printing mechanism is filled in a cylindrical shape plastisol in the form of polyurethane compositions with one or two sides through the Central opening of one or two covers from the end of the parties, after removing the cover in the form of injected axis with the supporting pins, fill the plastisol, the protruding axle skewer the cover and tighten it with the case, in accordance with the invention, the axis before filling the form is applied to increase the adhesion to metal bonding material such as a solid which can produce simultaneous vibration, the intensity of which depends on the viscosity of the plastisol.

Drawing on the axle before you die-casting increases the adhesion to metal adhesive material such as rigid PVC with thickness of 5 - 7 mm with subsequent heating to 100-120oC increases the adhesion to metal plastisol, which is a cause of durable fastening axis of the roller, increasing its durability.

When possible vibration of the form when it is filled with intensity, depending on the viscosity of the plastisol, eliminates the presence of pores and bubbles being formed in the mass, which further increases the adhesion to metal plastisol, increasing the durability of the roller.

In more detail the claimed technical solution is seen in the drawing, which presents a cylindrical shape with one cover, taken with the form of bolts with the axis of the cross section.

Form for molding elastic roller has a cylindrical housing 1 with a bottom 2 having a Central hole 3, the cover 4 with a Central hole 5, the tubular axle 6 with the supporting trunnions 7, members of the center hole. Cover 4 and the upper part of the housing 1 forms have placeopedia limb 8 with holes for tightening bolts 9.

For molding elastic shaft CR axis cause dry PVC thickness 5-7 mm, followed by heating to 100-120oC. After released from the lid opening into the space between the inner side of the chassis and the axle of the plastisol is poured, for example polyurethane. When this form is attached to the vibrating table and subjected to vibration. After filling the free space of the form you put on the cap and putting the Central hole on the axle and tighten with the form by means of bolts. After curing plastisol cover is removed, the obtained roller axis and the pins removed from the mold and subjected to surface mechanical treatment of type sanding, polishing, etc., Obtained rollers have a smooth, without cavities elastic surface and provide a uniform pressure to the sheet material, such as fiberboard.

The cylindrical shape may be provided with a bottom with a Central hole for the axle or cross and contractible housing forms a lid with a Central hole for the axle. Cover with the form can be pulled together by bolts.

The axis can be made in the form of a tube, leaving the shape of the ends of which is fixed a pivot axle.

Installation in a cylindrical form, the axis of the support pins provides the receiving roller with high reliability and durability and facilitates set RMI for long roller, provides improved uniformity and density of the solidified plastisol.

Cover, contractible, in particular, bolts, also provides improved uniformity and density of the solidified plastisol.

In General, the hallmarks of technical solutions to improve the quality of the elastic roller.

The inventive elastic roller can be manufactured industrially using known techniques, technologies, raw materials find wide application in printing mechanisms.

Sources of information

1. The invention application Germany 19509393, IPC: 41 B F 31/14, op. 19.09.96.

2. The application of EPO 0544374, IPC: 41 B F 31/26, op. 02.06.93.

3. The application of EPO 0335435, IPC: 41 B F 31/26, op. 04.10.89.

4. Howled. the application Germany 3907582, IPC: 41 B F 31/26, op. 13.09.90.

5. U.S. patent N 3475803, class B 41 F 31/14, 04.11.69.

1. A method of making an elastic roller for the printing mechanism by making the mandrel elastic cushion filled cylindrical plastisol in the form of polyurethane compositions with one or two sides through the Central opening of one or two covers from the end of the parties, with the cover in the form of injected axis with the supporting axle is the axle before filling the form is applied to increase the adhesion to metal bonding material such as rigid PVC with thickness of 5 - 7 mm and then heated to 100 to 120oC.

2. A method of making an elastic roller for a printing mechanism under item 1, characterized in that the die casting produces simultaneous vibration, the intensity of which depends on the viscosity of the plastisol.

 

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