JPH06344682A - Printing blanket - Google Patents

Abstract

PURPOSE:To provide a printing blanket capable of replacing only its surface layer and easy to replace. CONSTITUTION:In a printing blanket wherein a surface layer is provided on a base layer 54 wherein a compression layer 53 is arbitrarily provided on a reinforcing layer 51, self-adhesive layers 532,54l are provided to one of or both of the base layer 54 and the surface layer 53. Since the self-adhesive layers are provided between the base layer and the surface layer and both layers are made freely detachable, the surface layer can be made easily detachable if necessary.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a printing blanket, and more particularly to a printing blanket having a surface layer with good transferability.

[0002]

2. Description of the Related Art As shown in FIG. 4, an offset printing machine includes a plate cylinder 1 on which a plate serving as an original is wound, and the plate cylinder 1
A blanket cylinder 2 that rotates in conjunction with the blanket cylinder 2 and an impression cylinder 4 that holds the printing paper 3 under pressure with the blanket cylinder 2
It is more basically configured. A blanket 5 is wound around the blanket cylinder 2.

Ink is adhered to the plate wound around the plate cylinder 1, the image formed by the ink is once transferred to the blanket 5 of the blanket cylinder 2, and the transferred image is printed on the printing paper 3 which contacts. To do.

In the blanket 5 used in such a printing machine, generally, a compression layer 52 of an elastic material is formed on a reinforcing cloth 51 as needed, and a second compression layer 52 is further formed on the compression layer 52, as shown in FIG. After the reinforcing cloth 51 is provided (hereinafter referred to as a base layer 54), a rubber surface layer 53 is formed, and the printing paper 3 is adapted to contact the surface layer 53.

When the printing blanket 5 as described above is mounted on the blanket cylinder 2, as shown in FIG. 3, after the printing blanket 5 is wound around the blanket cylinder 2, both ends thereof are provided on the blanket cylinder 2. It is adapted to be inserted into the provided mounting gap 21 and wound and mounted by the winding tool 6.

The surface layer 5 of such a printing blanket
If the item 3 needs to be replaced due to use or some other situation, the entire printing blanket conventionally needs to be replaced. However, in such a case, the base layer 54 does not need to be replaced at all, and therefore the base layer 54 is wasted and the amount of waste increases. Further, the replacement work of the blanket 5 needs to be performed in a narrow work space, which is also a difficult work.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a printing blanket in which only the surface layer can be replaced and which can be easily replaced.

[0008]

To achieve the above object, a printing blanket according to the present invention is a printing blanket in which a reinforcing layer, a base layer optionally provided with a compression layer, and a surface layer are further provided. An adhesive layer is provided on either or both of the base layer and the surface layer.

According to the present invention, since the adhesive layer is provided between the base layer and the surface layer and both layers are detachable, there is an advantage that the surface layer can be easily replaced when it is necessary to replace it.

The present invention will be described in more detail.

In the construction of the printing blanket according to the present invention, the compression layer 52 of the elastic body is formed on the reinforcing cloth 51 as needed, and the second reinforcing cloth 51 is further provided on the compression layer 52 as needed. After that, the surface layer 53 is formed. The base layer 54 includes the above-mentioned reinforcing cloth 51, the compression layer 52, and the second reinforcing cloth 51.

A base adhesive layer 54 is formed on the base layer 54.
1 is provided on the other hand, the surface layer 53 is an ink transfer layer 531 for transferring ink and a surface adhesive layer 5 on the back surface thereof.
The structure has 32.

The base layer 54 is formed longer than the above-mentioned surface layer 53 and has a mounting portion 542 protruding from the surface layer 53. The base adhesive layer 541 is also formed slightly longer than the surface layer 53. The structure has a protrusion 543 (see FIGS. 2 and 3).

When such a printing blanket is used, after the printing blanket 5 is wound around the blanket cylinder 2 as shown in FIG. 2, both ends of the blanket cylinder 5 are attached to the mounting gap 21 provided in the blanket cylinder 2. , And is wound and mounted by the winding tool 6. At this time, the mounting portion 542 becomes a portion to be wound into the winding tool 6, and the protruding portion 543 of the base adhesive layer 541 extends into the gap 21, but the surface layer 53 does not enter the gap 21. There is.

As described above, the ink transfer layer 5 of the surface layer 53.
Since the surface adhesive layer 532 and the adhesive layer of the base adhesive layer 541 are provided between 31 and the base layer 54, when the surface layer 53 is replaced, the surface layer is peeled off from the end of the surface layer 53. The new surface layer 53 can be easily replaced by adhering it to the base layer 54. In the case of the printing blanket having the above structure, when the surface layer 53 is peeled off, the surface adhesive layer 532 is the ink transfer layer 531.
Preferably, the base adhesive layer 541 remains on the base layer 54, while the base adhesive layer 541 is peeled off integrally with the base layer. Therefore, it is preferable that the adhesive layers 532 and 541 adhere to the ink transfer layer 531 and the base layer 54 stronger than the adhesive layers 532 and 541 do.

It is clear that the base adhesive layer 541 and the surface adhesive layer 532 may be either one of them, unlike the above-mentioned constitution, but they may be peeled off at the time of printing,
It is natural that no deviation should occur. Therefore, the overall adhesive strength of the adhesive layer (if there is a base adhesive layer and a surface adhesive layer, the adhesive strength of the base adhesive layer + the adhesive strength of the surface adhesive layer) is 0.3 to 5.0 kgf / cm. Is good. If it is less than 0.3 kgf / cm, the surface layer 53 may fall off or rub, while 5.0 kgf
If it exceeds / cm, it will be difficult to peel off the surface layer,
In addition, the base layer 54 may be damaged.

Examples of the above-mentioned adhesive layer include acrylic type, rubber type (butyl rubber, etc.), silicone type, polyvinyl ether and the like.

The total thickness of the adhesive layer is preferably 0.05 to 1 mm. If it is less than 0.05 mm, the adhesive strength may be insufficient, while if it exceeds 1 mm, vibration may occur between the upper and lower layers of the adhesive layer, which is uneconomical and may be broken by viscous deformation. is there.

When the surface adhesive layer and the base adhesive layer are provided, it is preferable to divide the thickness of the adhesive layer into substantially equal parts.

[0020]

Example A compression layer was provided on a reinforcing cloth, and a reinforcing cloth was further provided. Then, an acrylic adhesive was applied and cured to form a base layer having a base adhesive layer having a thickness of 1.50 mm.

On the other hand, an NB having a thickness of 0.30 to 0.32 mm
An acrylic pressure-sensitive adhesive was applied to the R surface layer and cured to form a surface pressure-sensitive adhesive layer having a thickness of 0.15 to 0.17 mm. The adhesive strength of the entire adhesive layer is 0.7 kgf / c
It was m.

Then, after mounting the base layer on a Mitsubishi sheet-fed press, the surface layer was attached to the base layer for printing. Sheet-fed offset ink was used as the ink, and printing was performed on art paper at a printing speed of 90 sheets / min. In this way, the halftone dot reproducibility was measured. The halftone dot reproducibility was determined by measuring the ink density on the printed art paper with a densitometer. A reflection densitometer was used as the densitometer. The results are shown in Table 1. The comparative example is the dot reproducibility of the conventional printing blanket.

[0023]

As a result of the above, it was found that the halftone dot reproducibility of both printing blankets was almost the same, and good printing was possible without causing the surface layer to be displaced.

[0025]

As is apparent from the above description, according to the printing blanket of the present invention, since the adhesive layer is provided between the base layer and the surface layer and both layers are detachable,
When the surface layer needs to be replaced, it has the advantage that it can be replaced easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a configuration example of a printing blanket of the present invention.

FIG. 2 is a plan view of a configuration example of a printing blanket of the present invention.

FIG. 3 is a cross-sectional view when the printing blanket of the present invention is mounted on a blanket cylinder.

FIG. 4 is a schematic view of a printing machine.

FIG. 5 is a cross-sectional view of a conventional printing blanket.

[Explanation of symbols]

 2 Blanket cylinder 5 Printing blanket 51 Reinforcement layer 52 Compression layer 53 Surface layer 531 Ink transfer layer 532 Surface adhesive layer 54 Base layer 541 Base adhesive layer

Claims (2)

[Claims] 1. A printing blanket having a reinforcing layer, a base layer optionally provided with a compression layer, and a surface layer further provided with an adhesive layer on one or both of the base layer and the surface layer. A blanket for printing. 2. The adhesive force of the entire adhesive layer is 0.3 to 5.0 k.
The printing blanket according to claim 1, which is gf / cm.