Self-levelling gasket under deckel for printing machine

FIELD: printing.

SUBSTANCE: gasket for offset cylinder of printing machines contains at least one inelastic polyester-based layer and at least one polyurethane elastomeric layer. The said layers are connected inseparably together. The polyurethane elastomeric component has certain chemical/physical characteristics.

EFFECT: ecological compatibility; antipyrine properties; resistance to solvents and mechanical stress; good machinability by mechanical means; durability; significant degree of universality use; good modifiability of the cylinder and elastic flexibility; improved constructional configuration of the printing contact zone; significant degree of uniformity of the image elements spreading on the raster and improved printing stability.

5 cl, 3 dwg

 

The present invention relates to a gasket under Dekel for printing machines, in particular offset.

Addressing offset printing machines, while not excluding other printing machines, such machines usually contain three cylinder: plate cylinder, an offset cylinder, covered impregnated with rubber cloth, and a printing cylinder. Under the tight rubber cylinder contains regular pad under Dekel, made of separately removable (incompressible) calibrated paper sheets to adjust the working diameter of the cylinder; and a separate podatelna material, usually made of elastically compressible polybutadiene.

In order to align in the field of machinery printing machines already known to use as shims under Dekel, films of polyesters, coated on one side with glue.

The lack of use of paper and complex polyester is that both are hard material (therefore not aligned themselves properly), and paper, in addition, is not antepartum material.

Another patent of the same applicant (European patent No. 1,323,527) is already known to use as shims under Dekel few sheets of paper or polyurethane)connected together effective at short-term pressing of the adhesive, which provides perhaps the th removal of individual sheets, to adjust the gasket under Dekel (with rubber tissue) to the desired thickness.

The present invention is to provide such a gasket under Dekel for printing machines, which will meet certain requirements, which the prior art is responsible only partly, i.e. laying under Dekel according to the present invention meets the following requirements: environmentally friendly, flame retardant properties, solvent resistance and mechanical stresses, good machinability mechanical means, durability, high degree of versatility, good modifiers are applied to the cylinder, and resilient elasticity, improved structural configuration of the print zone of contact, a considerable degree of uniformity of application across the raster of image elements, improved stability of printing.

These and other objectives of the invention, illustrated in the below detailed description, are provided by shims under Dekel for printing machines according to the technical characteristics specified in the enclosed claims. The invention is illustrated in the following detailed described as a non-limiting example, the description of some preferred variants of its implementation, presented in the form of examples with the reference to the schematic drawings (Fig.1-3), showing different sections of route options under Dekel according to the present invention.

Laying under Dekel (specified anywhere a reference position 1) in its most General form consists of a composite structure comprising the inelastic part 2 (referred to for simplicity as "hard"), formed from a film based on a complex of the polyester (PPA) high light transmission (e.g., transparent "antineutrophil" TES, the term "antineutrophil" indicates that he is using physical treatment given to small roughness, in order to enable communication with another layer)manufactured by the company POLICROM Inc., , Anselem, pieces Pennsylvania (USA) and the company Toray (Japan), and elastomeric covering 3 (on one side EIT film) - based polyurethane and/or thermoplastic polyurethane (for example, products with the trade name Estane 54660 and 58271 company a Noveon Inc., USA).

On the side opposite the elastomeric covering, the composite structure can have one or more strips of adhesive, or may be completely covered with glue known type, providing lightweight pinning and unpinning (effective for short-term pressing of the adhesive). To connect with the metal surface of the cylinder or steel Dekel glue, as mentioned above, will cover the entire surface. Figure 1 adhesive specified position 4.

The composite structure can be obtained by known methods of obtaining the compound of the coating film, for example, doctor blade method, calendering, co-extrusion or by using a combination of calendering and co-extrusion.

The thickness of the elastomer may be in the range from 20 to 1000 μm (for each layer, with a maximum number of three layers in the case of composite structure with the number of layers is more than one, the United inseparable).

The film thickness on the basis of the PPA can have values from 40 to 100 microns (one side is completely covered with glue and contain not more than 5 μm glue in thickness) and from 50 to 350 microns (without adhesive coating) or with a partial adhesive coating along at the strip.

The following examples.

Example 1

The film is based on EIT thickness of 40 μm, coated with glue on one side (protected by a removable film having a silicone coating), in a non-adhesive side of the known method, doctor blade coating) coated with elastomer, polyurethane-based high hardness in the solution of dimethylformamide thickness of 100 microns.

Apply glue this dockable/dockable type, known as "effective in the short-term pressure".

Chemical/physical characteristics of the polyurethane of the following:

Hardness And shore75 - 95STD. DIN 53505
Density, g/CC1,10 - 1,25STD. DIN 53479
Cyclic compression, %compressibility 60%STD. DIN 53517
Elasticity, %30 - 40STD. DIN 53512
Solvent resistancepersistent

The challenge is in the execution of the loop one million compressions (at 60% on the compressed side), without reducing the thickness of 5 cm elastomeric disks that were 60% compressive load on the elastomeric side, with pre-load of 2 N, with a repetition rate of 20 Hz.

Example 2

The film is based on EIT thickness of 40 μm was coated on one side of the elastomeric layer (polyurethane high hardness) of a thickness of 160 μm by the method of calendering. Details regarding adhesives and coatings, see Example 1.

Example 3

The film is based on EIT thickness of 100 μm using known co-extrusion method was combined with the elastomeric film based on thermoplastic polyurethane.

Example 4

The elastomeric layer thickness of 635 μm on the basis of thermoplastic polyurethane applied by calendering on a standard film about the new EIT thickness of 175 μm.

Example 5

The composite structure formed from a film-based TES thickness of 350 μm and deposited doctor blade method, a layer of elastomer on the basis of polyurethane of a thickness of 450 μm.

Example 6

The composite structure formed from a film-based TES thickness of 500 μm and calendered layer of elastomer on the basis of polyurethane of a thickness of 1000 μm.

Example 7

The polyurethane layer with a thickness of 300 μm applied (the doctor by the way) on the first layer formed from a film-based TES thickness of 175 μm.

Then applied (calendering) film based on EIT thickness of 50 μm on the layer of polyurethane, then (calendering) elastomeric layer 255 µm (thermoplastic polyurethane), then the last layer thickness of 20 μm thermoplastic polyurethane whose characteristics, hardness, for example, differed from the other layers.

Example 8(2)

Obtained by calendering the first composite structure formed from a film (2A) EIT thickness of 175 μm and polyurethane elastomer layer (3A) of a thickness of 600 μm, and calendered in the same composite structure formed from a film (2A) EIT thickness of 175 μm and polyurethane elastomer layer (3A) of a thickness of 600 μm. The coating obtained corresponds to one of the requirements of the users: a simple combination of two one is the same, ie the same, composite structures.

Example 9(3)

Jointly extruded and calendered multi-layered composite structure formed of the first film (2b) EIT thickness of 350 μm, a layer of thermoplastic polyurethane elastomer (3b) with a thickness of 600 μm, the second film (2b) EIT thickness of 50 μm and the second polyurethane elastomer layer (3b) of a thickness of 550 μm.

Example 10

At least one film EIT thickness of 50 μm, covered effective for pressing glue (i.e. dockable/dockable)deposited on a composite structure containing polyurethane film with a thickness of 225 μm and the film EIT thickness of 175 μm. Instead of a single coated adhesive tapes can be used two or three films, stacked separately and removed in order to adjust the thickness.

The scope of this invention also includes the usual ways of combining together multiple composite structures with obtaining the composite structure of the desired thickness having the desired chemical/physical characteristics.

1. Gasket for offset cylinder printing machines, containing at least one viscoelastic layer and at least one elastomeric layer, inseparably United together, and inelastic layer or layers is a layer or layers on the basis of a complex of the polyester and elastomeric layer or layers n is ecstasy a polyurethane layer or layers, characterized in that for obtaining a self levelling pads elastomeric component has the following chemical/physical features:

Hardness And shore75-95STD. DIN 53505
Density, g/CC1,10-1,25STD. DIN 53479
Cyclic compression, %compressibility 60%STD. DIN 53517
Elasticity, %30-40STD. DIN 53512
Solvent resistancepersistent

2. The gasket according to claim 1, in which the thickness of one layer based on a complex of the polyester is from 50 to 350 μm, and the thickness of the same polyurethane elastomer layer is from 20 to 1000 microns.

3. The gasket according to claim 1, in which, in the case of multiple-imposed layers of complex polyester, some of the layers are connected with the possibility of their removal by means of glue.

4. The gasket according to claim 1, in which, in the case of multiple polyurethane elastomer layers, at least one of these layers has a shore a hardness that is different from the other layers.

5. The gasket according to claim 3, in which the number of implemented, with the possibility of removal of layers does not exceed three layers, the thickness of each of them accepts the than 50 microns.



 

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