Device for paintless relief stamping

FIELD: printing industry.

SUBSTANCE: invention relates to production of printing production and concerns device for paintless relief stamping. Contains punch with relief work surface and counterpunch with flat work surface, made from porous polyurethane, placed on base from solid polyurethane and covered from bottom and from above with layers with low friction coefficient.

EFFECT: invention allows to increase endurance of device and its efficiency.

1 dwg

 

The invention relates to the printing industry, in particular used for decoration binding covers, covers, labels and packaging, as well as in the production of an accidental products, where the operations are applied blind embossing. Such a finishing operation gives printed products more attractive, improves its appearance.

Famous traditional design of the device for embossing, consisting of a stamp with a relief surface and polymer contrastano (male mould or matrix) with working embossed surface, mirror towards the relief of the working surface of the stamp [1].

Working with these contstantly characterized by a large time of checkout equipment, significantly depending on the number of clichés and corresponding kontostanos. Required precise positioning of kontostanos relatively cliché within ±0.05 mm with the necessary make-ready almost every contrastano. In addition, the relief conerstone for embossing have a high cost, and the annual cost of the relief conerstone grow proportionally to the number of prilodec.

The aim of the invention is to increase the resistance of contrastano and process efficiency blind embossing by simplifying the design of contrastano./p>

To achieve this goal in the device for blind embossing, containing the stamp with a relief surface and polymer contrastin with the working surface located opposite the relief of the working surface of the stamp, polymer contrastin made of porous polyurethane and has a flat working surface, located above the gap areas outside the contour of the image of the stamp and polymer contrastin on the basis of solid polyurethane and covered on the top and bottom layers with a low coefficient of friction.

The drawing shows a device for blind embossing in the original position.

Device for blind embossing consists of stamp 1 with raised working surface 2 and contrastano 3 flat working surface 4 located opposite the working surface of the stamp 2 and higher space areas 5 on the height, the greater the maximum elevation of the stamp. Polymer contrastin 3 made of porous polyurethane of a thickness of, for example, 5...10 mm, placed on the base 6 of the solid polyurethane of a thickness of, for example, 2...3 mm, and a hardness of 60...80% shore a, and coated on two sides by layers 7 with a low coefficient of friction.

Layers 7 with a low friction coefficient can represent, for example, fluorinated the superficial layers of porous polyurethane contrastano, as well as layers 7 may be a polymer film with a low coefficient of friction (for example, polyethylene terephthalate (PET)), a silicone coating or layers of a powder material (for example, from silicon powder). Between the die 1 and the polymer kontostanos 3 is a processed material 8.

Device for blind embossing works as follows.

The processed material 8 is placed on the working surface 4 of the elastic polymer contrastano 3. After that is blind embossing material 8 stamp 1 with a relief image 2 by bringing the die and contrastano. In addition, the material 8 begins to deform and form a relief surface 2 of the stamp 1, udaliaias in the elastic polymer contrastin 3 made of porous polyurethane. Elastic porous polyurethane contrastin 3 is compressed, squeezed and stretched, resulting in its working surface relief takes the form of a reverse relief the form of a stamp. In the process of deformation of the elastic porous polyurethane contrastin 3 is pressed into the base of a solid polyurethane 6.

As stretching and extrusion of porous elastic polymer contrastano between him and the material to be processed is formed by friction, which causes the tensile stresses in the material that may cause it to rupture. To reduce friction and prevent rupture of the material is the top layer 7 of a material with a low coefficient of friction. Perform design conerstone of elastic polyurethane plate 3 placed on the polyurethane solid base 6, can reduce the rigidity of contrastano, and therefore, increase the value of the obtained relief on the material and reduce power costs during deformation of contrastano.

The lowering of the rigidity of contrastano when it is compressed, and therefore, reduce power and energy costs, is the location of the work plane 4 contrastano, the corresponding area of the image of the stamp above the gap plots 5 by an amount greater maximum height of the relief image of the stamp.

In addition, the extrusion of the material of the elastic porous polyurethane contrastano 3 also prevents friction between the bottom surface and the elastic Foundation of solid polyurethane 5, which may lead to an increase of force between the die and kontostanos. Reduction of the specified friction force and the elimination of obstacles to the extrusion of the material of the elastic porous polyurethane contrastano 3 is the bottom layer 7 with a low coefficient of friction.

Compared with the prototype implementation of contrastano flat work surface makes it easy to the a u se due to the lack of complex reliefs on the working surface, exactly the relief of the stamp, but in reverse relief. Eliminates the need for precise positioning of contrastano relative to the image on the stamp and the execution register, and also eliminates the makeready operation, which reduces the time of preparation of the device for stamping. In addition, there is no need to change contrastano while adjusting to the new edition and the changing pattern of the stamp within constant working space.

Performing conerstone of polyurethane having a high elastic and strength properties and a small relaxation time deformation, increases the length of contrastano.

Perform upper and lower layers of polymer contrastano 3 with a low coefficient of friction reduces the tensile stresses in the material and prevents it breaks.

The proposed solution allows to simplify the design of contrastano, to reduce the complexity of its manufacture, the cost of contrastano, preparing the device for embossing to work, and consequently, to improve the wear resistance of the device and its efficiency.

Device for blind embossing, containing the stamp with a relief surface and polymer contrastin with a working surface opposite the relief of the working surface of the stamp is, characterized in that the polymer contrastin made of porous polyurethane and has a flat working surface, located above the gap areas outside the contour of the image of the stamp and polymer contrastin on the basis of solid polyurethane and covered on the top and bottom layers with a low coefficient of friction.



 

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