JPH03381Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to printing blankets, and more specifically, the invention relates to printing blankets, and more specifically, a printing blanket that is wound around a blanket cylinder and transfers ink transferred from the plate surface of the corresponding plate cylinder to the printing paper surface. It relates to a printing blanket to be transferred onto.

<Background and Prior Art> Conventionally, printing blankets have generally been provided with an ink transfer layer formed on one side and a reinforcing layer laminated on the back side.

The printing blankets mentioned above are constantly subjected to compression by the plate cylinder and impression cylinder during printing, so the rubber, which is the main material, gradually gets fatigued and deteriorates. The rubber gradually swells and deteriorates due to the cleaning oil used to wipe it off. Furthermore, if surface scratches such as paper marks or paper dust residues occur, printing problems will occur, making it impossible to continue using the blanket.

For this reason, the reality is that blankets that have been used for a certain period of time are replaced with new ones and discarded.

However, it is very uneconomical to discard an expensive blanket simply because the ink transfer layer has deteriorated or is damaged, which increases printing costs and is not reasonable from the standpoint of resource conservation.

On the other hand, in order to avoid the inconvenience of the back rubber or internal rubber of the blanket being swollen by cleaning oil, the back and side surfaces of the blanket have been coated with an oil-resistant layer; However, when the compressive stress decreases due to fatigue deterioration or surface scratches occur, it is replaced with a new one, which is also uneconomical.

<Purpose> This invention was made in view of the above-mentioned circumstances, and the purpose is to provide a printing blanket that can be used on both sides of the blanket and double its operating life.

<Structure> The structure of the printing blanket of this invention to achieve the above object is that ink transfer layers are formed on both the front and back surfaces, and the intermediate layer between the ink transfer layers is composed of at least one reinforcing layer. One of the ink transfer layers is laminated on the intermediate layer with a release layer interposed therebetween.

<Example> Next, an example of this invention will be described below with reference to the drawings.

FIG. 1 is an enlarged sectional view of a printing blanket A of this invention.

Reference numeral 1 denotes an ink transfer layer, which is formed on both the front and back surfaces of the blanket A. The ink transfer layer 1 is made of rubber or plastic such as urethane.

Reference numeral 2 denotes an intermediate layer formed between the ink transfer layers 1, and in the case of FIG.
2a, the front and back sides are symmetrical. The reinforcing layers 2a, 2a are made of a plastic sheet made of acrylic resin, polyester resin, etc., or a rubberized sheet of woven fabric made of cotton, rayon, polyester, etc.

One ink transfer layer 1 is laminated on the intermediate layer 2 via a release layer 4 made of a resin film such as a polyester film. More specifically, the release layer 4 and the ink transfer layer 1 are bonded with a primer or the like so that they cannot be separated from each other, whereas the release layer 4 and the intermediate layer 2 are bonded with an adhesive or the like so that they cannot be separated from each other. It is now removable. That is, the ink transfer layer 1 is configured to be peelable from the intermediate layer 2 together with the peeling layer 4.

The surface of the ink transfer layer 1 on the non-peelable side (lower side in Figure 1) is covered with a peelable oil-resistant layer 3 made of a synthetic resin film such as a polyester film so as not to be affected by the swelling effect of cleaning oil. It is preferable to keep it.

In the above-mentioned blanket A, when one of the peelable ink transfer layers 1 deteriorates or scratches occur on the surface, it is peeled off from the intermediate layer 2 to form the oil-resistant layer 3. Then, this is peeled off and the other ink transfer layer 1 on the non-peeled side is used inverted. At this time, due to the peeling of one of the ink transfer layers 1, the overall thickness decreases, and if left unchanged, the printing pressure will change. can be easily adjusted by interposing it between the blanket A and the blanket body.

Next, in the embodiment shown in FIG.
A compressible layer 2b is interposed between a and the reinforcing layer 2.
a and 2a constitute an intermediate layer 2. In this case as well, the ink transfer layer 1 and the release layer 4
It is configured to be separable from the intermediate layer 2 via.
The compressible layer 2b is made of a flexible synthetic resin foam sheet obtained by mixing a foaming agent, Saran micro hollow spheres, etc. Therefore, in this embodiment, the compressible layer 2b is Due to the presence of 2b, very good impact absorption properties can be exhibited.

Furthermore, as shown in FIG.
The combination is arbitrary as long as it has a structure, and in addition to this, the intermediate layer 2 and the release layer 4 may be joined together, and the ink transfer layer 1 and the release layer 4 may be laminated in a removable manner. Various design changes can be made without changing the gist of the invention.

<Effects> According to the printing blanket of this invention constructed as described above, one side of the ink transfer layer is made removable via the release layer, so the ink transfer layer on the removable side may deteriorate or Alternatively, if surface damage such as peeling or abrasion occurs, if this layer is peeled off from the intermediate layer, the other ink transfer layer can be reused with the adverse effects of the damage completely removed.

Therefore, compared to conventional printing blankets that have an ink transfer layer on only one side, the operating life can be doubled, and it is also convenient to use, contributing to lower printing costs, and has various other excellent practical effects. You will be able to donate things.

[Brief explanation of the drawing]

The figure shows an example of this invention.
The figure is an enlarged sectional view, and FIGS. 2 and 3 are enlarged sectional views showing other embodiments. 1... Ink transfer layer, 2... Intermediate layer, 2a...
Reinforcement layer, 2b... Compressible layer, 3... Oil-resistant layer, 4
...Release layer, A...Blanket.

Claims (1)

[Claims for Utility Model Registration] 1. Ink transfer layers are formed on both the front and back surfaces, the intermediate layer between the ink transfer layers is composed of at least one reinforcing layer, and one of the ink transfer layers is peelable. A printing blanket characterized in that the printing blanket is laminated to an intermediate layer through layers. 2. The printing blanket according to claim 1, wherein the surface of the other non-peelable ink transfer layer is covered with a peelable oil-resistant layer. 3. The printing blanket according to claim 2, wherein the peelable oil-resistant layer is a polyester film. 4. The printing blanket according to claim 1, wherein the release layer is a polyester film. 4. The printing blanket according to claim 1, wherein the intermediate layer has a compressible layer interposed between two reinforcing layers.