JPS63141788A - Moisture-absorptive sleeve for printing and production thereof - Google Patents

Abstract

PURPOSE:To make it possible to maintain moisture between short fibers set on the surface of a sleeve by flocking, enhance moisture-absorbing efficiency and enable long-time preserva tion under normal humidity and temperature conditions, by uniformly setting short fibers on the outer peripheral surface of a hollow cylindrical sleeve base body constituted of a heat-shrinkable film resin, by flocking. CONSTITUTION:A sleeve base body 2 is heated by a heating means in the condition of being fitted to a performing shaft core, whereby the body 2 is contracted in the direction of the axis, and is reduced in diameter. Next, the base body 2 is detached from the shaft core, and the outer peripheral surface thereof is entirely coated with an adhesive 6. Then, short fiber 3 of nylon or the like about 0.3mm in diameter and about 0.5-1.0mm in length are electrified with negative charges, while the sleeve base body 2 is electrified with positive charges, and the short fibers are set upright substantially unformly on the whole surface of the outer peripheral surface of the base body 2 by the attraction between the negative charges and the position charges. The sleeve base body 2 is appropriately cut to a predeter mined length, the cut base body is fitted to a main body 5 of a roller, and is heated by a heating means. By the shrinking action of the sleeve base body 2, the inner peripheral surface of the base body 2 is brought into close contact with the outer peripheral surface of the main body 5 of the roller, whereby the fitting of a moisture-absorptive sleeve 1 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a technology that is particularly effective when applied to a heating sleeve that supplies moisture to the surface of a gold R14 original plate for printing.

[Conventional technology]

In so-called offset printing technology, in order to moisten the surface of the metal original plate for printing, a heating roller is installed in the printing device so as to rotate in contact with the surface of the metal original plate. Moisture is supplied to a heating sleeve attached to the outer peripheral surface of the heating roller. That is, the structure is such that a certain amount of moisture is given to the heating sleeve, and the moisture in the heating sleeve is supplied to the metal original plate side that is rotating in contact with it to maintain a certain level of moisture on the surface of the metal original plate.

By the way, as this type of heating sleeve, one made by condensing water-containing shrinkable paper and forming it into a hollow cylindrical shape is known. That is, at the time of installation, the above-mentioned sleeve is attached to the outer peripheral surface of the roller body, and by supplying moisture to this sleeve, the sleeve itself contracts and the sleeve is fixed in close contact with the roller body, and at the time of printing, By supplying a certain amount of moisture to the attached heating sleeve, the moisture is retained between the fibers of the paper and the metal original plate that is rotating in contact with this roller is moistened. It is.

[Problem that the invention seeks to solve]

However, the inventors of the present invention have discovered that the paper heating sleeve described above has the following problems.

First, this type of heating sleeve is made by condensing paper, so the fibers of the paper are closely spaced.
It takes a long time to fully infiltrate the entire area, and it has the disadvantage that the infiltration rate varies. Therefore, when a new sleeve is attached to the roller, a long trial run is required to allow moisture to penetrate into the entire sleeve.

Second, paper heating sleeves are attached to rollers by taking advantage of the paper's ability to absorb moisture and shrink. Therefore, if the sleeve itself is stored at room temperature, it will not absorb moisture in the air. There is a possibility that the material will absorb moisture, causing it to shrink and become deformed before being attached to the roller. In other words, it has the disadvantage that it is difficult to store it at room temperature for a long period of time.

Thirdly, it was also found that the service life varies from product to product. In other words, in the heating sleeve described above, if the surface of the sleeve becomes fluffy, it will cause dust to adhere to the printing surface and it will not be possible to obtain a sufficient heating effect for the original plate. The status varies depending on the product. Regarding this point, according to research conducted by the present inventors, it has been revealed that one of the reasons for this is that variations in the product occur due to the direction of the grain of the paper when the paper, which is the constituent material of the product, is scooped. .

The present invention has been made focusing on the above problems,
The purpose is to provide a printing moisture sleeve that has good heat supply efficiency, excellent storage properties, and long life.

[Means for solving problems]

The present invention provides a moisture supply sleeve for printing in which a hollow cylindrical sleeve base is formed from a heat-shrinkable film resin, and short hair material is uniformly flocked on the outer peripheral surface of the sleeve base.

In addition, this printing moisture sleeve is manufactured by heating and shrinking a sleeve base made of a heat-shrinkable film resin attached to a preformed core to flatten the inner circumferential surface of the base, and then flattening the inner circumferential surface of the base. It is formed by flocking short hair material with adhesive.

[Effect]

According to the above-mentioned means, since the structure is such that moisture is contained between the short hair materials on the sleeve surface, moisture can penetrate more efficiently than the #a fibers of paper, and the mounting machine It is possible to move to regular printing in a short time.

In addition, since the roller body is attached to the roller body using heating means such as hot air or hot water by utilizing its heat shrinkability, it is easy to attach and can be stored for a long time at room temperature.

Furthermore, since the outer surface of the sleeve is flocked with short hair material, there is no risk of fuzzing, and the life of the sleeve can be extended.

Moreover, through the above manufacturing process, it is possible to prevent variations in the flocking density when flocking the short hair material, and therefore it is possible to maintain a uniform moisture content over the entire outer circumferential surface of the sleeve.

Embodiment] Fig. 1 is an enlarged partial sectional view showing the cross-sectional structure of a heating sleeve which is an embodiment of the present invention, Fig. 2 is a perspective view showing the state in which this sleeve is mounted on a roller, and Fig. 3 ( a) ~ (C)
FIG. 4 is an explanatory view sequentially showing the manufacturing process of the sleeve base, and FIG. 4 is a sectional view showing the state in which the sleeve base is attached to the preformed shaft core.

The heat supply sleeve 1 of this embodiment consists of a sleeve base 2 and a large number of short hairs 3 implanted on the outer circumferential surface of the sleeve base 2.

Here, we will explain the third method for manufacturing the sleeve base body 2 above.
The explanation is as follows based on the figure.

First, a tube-shaped sleeve base 2 is formed of vinyl chloride or the like, and the sleeve base 2 is first formed as shown in FIG.
After forming a small diameter base tube 2a as shown in a), this base tube 2a is heated and stretched radially outward from the center by the action of air pressure etc. to a large diameter state, and then cooled in this stretched state. formed by (
Figure 3)).

By forming the base tube 2a in such a manner that it is stretched outward from the center, the composition of the vinyl chloride that is the constituent material of this tube is also expanded in the circumferential direction, and the sleeve base body 2 is again stretched. When heated, it has the characteristic of shrinking in the axial direction.

The sleeve base 2 obtained in this way is often folded into a flat state as shown in FIG. 3(C) for convenience of storage and transportation of the sleeve base 2 itself. When folded, a folded portion 2C is inevitably formed in this folded portion.

Next, the sleeve base body 2 manufactured as described above is attached to a preformed shaft core 4 as shown in FIG. This preformed shaft core 4 may be of any type as long as it has a heat-resistant structure with a certain diameter accuracy. Also,
Such a preformed shaft core 4 has a diameter that is approximately 1.05 times the diameter of the roller body 5 used as a temperature supply roller, for example.

The sleeve base body 2 is heated by heating means such as hot air or hot water while being attached to the preformed shaft core 4. When such heating is performed, the stretched composition of the sleeve base body 2 attempts to restore its original state and begins to contract in the axial direction, reducing its diameter, and finally the preformed shaft core 4 It maintains close contact with the surrounding surface.

Through the preforming process as described above, the folded portion 2C formed in the stretching process of the sleeve base body 2 is crushed, and the inner circumferential surface of the sleeve base body 2 is processed into a flat state.

Next, the sleeve base body 2 is removed from the preformed shaft core 4, and an adhesive 6 is applied over the entire outer peripheral surface of the sleeve base body 2. In this state, the outer peripheral surface of the IJ-bubble base 2 is made of nylon or the like, and has a diameter of about 0.3 m, for example.
Short hair material 3 having a length of about 0.5 to 1.0 m and a length of about 0.5 to 1.0 marks is implanted. Such flocking of the short hair material 3 can be carried out by, for example, placing the short hair material 3 in a state where it is negatively charged, while the sleeve base 2 side is in a state where it is positively charged. By supplying from outside the outer peripheral surface of the sleeve base 2, the short hair material 3 can be planted in an upright state almost uniformly over the entire outer peripheral surface of the sleeve base 2 due to the attraction action of both charges. In addition, it is possible to control the flocking density of the short hair materials 3 on the outer peripheral surface of the sleeve base body 2 by adjusting the number of short hair materials 3 to be supplied at this time. Such flocking density is related to the diameter of the roller body 5 to be attached, that is, the relationship between the flocking density and the diameter of the sleeve base 2 at the time of final attachment.
It must be determined in relation to the shrinkage rate. In other words, when the sleeve base 2 is attached to the roller body 5, even if the flocking density of the short hair material 3 is too high or too low, an appropriate amount of moisture W will not be retained between the short hair materials, and the original (not shown) Good heat supply efficiency to the surface cannot be obtained.

The sleeve base body 2 obtained as described above is cut into a predetermined length as appropriate to obtain the heating sleeve 1 of this embodiment.

Since the sleeve base 2 of such a heating sleeve 1 is made of resin such as vinyl chloride, it can be stored extremely well without deformation even if exposed to the outside air at normal humidity for a long time. It has a sexual nature.

Next, a description will be given of how to attach the temperature supply sleeve 1 to the roller body 5 constituting the temperature supply roller.

First, the heat supply sleeve 1 is attached to the roller body 5 which has been removed from the apparatus so as to cover it from the axial direction. At this time, the temperature supply sleeve 1 of this embodiment is preformed so that the inner diameter of the sleeve base 2 is approximately 1.05 times larger than the diameter of the roller body 5, as described above. Therefore, the heat supply sleeve 1 can be easily attached to the roller body 5.

Next, the heat supply sleeve 1 is heated from the outside on the outer peripheral surface side using a heating means such as hot air or hot water.

As a result, the stretched composition of the sleeve base body 2 of the heat supply sleeve 1 attempts to restore its original state, so that the heat supply sleeve 1 contracts in the direction of the central axis of the roller body 5. Due to such a contraction effect, the inner circumferential surface of the sleeve base body 2 comes into close contact with the outer circumferential surface of the roller body 5, and the mounting of the heating sleeve 1 is completed.

In this way, the roller main body 5 to which the heating sleeve 1 is attached is supplied with a certain amount of water from the outside of its outer circumferential surface, and the outer circumferential surface rotates in contact with the metal original plate, so that the outer circumferential surface rotates to the surface side of the metal original plate. Apply a certain amount of moisture.

At this time, according to the heating sleeve 1 of this embodiment, the supplied water W is sucked by capillary action between the short bristles 3 flocked on the surface of the heating sleeve 10, as shown in FIG. and is further held in place by its surface tension. Therefore, it is possible to retain moisture better than the moisture retention effect between the fibers of paper.

In addition, according to this heating sleeve l, since the contact surface with the metal master plate is formed by flocking the short hair material 3, this surface will not become fluffed even after long-term heating work. Good heat supply efficiency can be maintained over a long period of time.

As described above, according to this embodiment, the following effects can be obtained.

(1) By forming the heating sleeve 1 in which the short hair material 3 is flocked upright on the outer peripheral surface of the sleeve base 2 via the adhesive 6, the short hair material 3+ can contain moisture. This allows moisture to penetrate the sleeve surface efficiently, making it possible to move to the main opening after a short trial run.

(2) Since the sleeve base 2 is attached to the roller body 5 by utilizing its heat-shrinkable property, even if the heating sleeve 1 is stored for a long period of time exposed to the outside air, the roller body 5 It is possible to prevent the heating sleeve 1 from shrinking and deforming due to moisture content before being attached to the heating sleeve.

(3) Since the outer circumferential surface of the heating sleeve 1 is formed with the short hair material 3 flocked thereto, there is no risk of the surface becoming fuzzed, and the life of the heating sleeve 1 can be extended.

(4) The sleeve base 2 formed by folding is attached to the preformed shaft core 4, and the sleeve base 2 is further heat-shrinked to flatten the inner circumferential surface of the sleeve base 2. When the heat supply sleeve 1 is attached to the heat supply sleeve 1, uniform heat supply efficiency can be maintained over the entire outer peripheral surface of the heat supply sleeve 1 without causing unevenness on the sleeve surface.

(5) According to (1) to (4) above, the supply of moisture to the metal original plate is further improved, so that uneven printing can be prevented and high-quality off-the-shelf printing can be realized.

Although the present invention has been specifically described above based on Examples, the present invention is not limited to the above-mentioned Examples, and can be modified in various ways without departing from the gist thereof.

For example, in the embodiment, vinyl chloride was used as the sleeve base 2, but the sleeve base 2 is not limited to this, and any resin material can be used as long as it is stretchable and has the property of shrinking when heated. good.

In the above description, the present invention is applied to a heating sleeve for offset printing, which is the field of application of the present invention, but the present invention is not limited to this.

〔Effect of the invention〕

According to the present invention, the printing moisture sleeve structure is made up of a hollow cylindrical sleeve base made of heat-shrinkable film resin and short hair material uniformly flocked on the outer peripheral surface of the sleeve base. Moisture can be absorbed between the short hairs on the surface of the sleeve, which improves heat supply efficiency and allows long-term storage at normal humidity and room temperature, and there is no risk of the surface becoming fluffy. ,
The life of the sleeve can be extended.

[Brief explanation of the drawing]

FIG. 1 is an enlarged partial sectional view showing the cross-sectional structure of a heating sleeve according to an embodiment of the present invention, FIG. 2 is a perspective view showing the heating sleeve of the above embodiment attached to a roller body, and FIG.
Figures (a) to (C) are explanatory diagrams sequentially showing the manufacturing process of the sleeve base used in the above example, and Figure 4 shows the sleeve base attached to the preformed shaft core in the manufacturing process of the sleeve base of the example. It is a sectional view showing a state. 1...Heating sleeve, 2...Sleeve base, 2a...Basic tube, 2C...Folding part, 3...Short hair material, 4...Preformed shaft core , 5...Roller body, 6...Adhesive, W...Moisture. Patent applicant Art Printing Co., Ltd. Agent Patent attorney Dai Tsutsui Sodo Patent attorney Hidemi Matsukura Figure 1

Claims (3)

[Claims] (1) A moisture-wicking sleeve for printing, comprising a hollow cylindrical sleeve base made of a heat-shrinkable film resin, and short hair material flocked with uniform density on the outer peripheral surface of the sleeve base. (2) After the sleeve base made of a heat-shrinkable film resin is attached to the preformed shaft core and the inner peripheral surface of the sleeve base is flattened by heating, adhesive is applied to the outer peripheral surface of the sleeve base. A method for manufacturing a moisture-wicking sleeve for printing, characterized in that short hair material is flocked through the fibers. (3), the flocking of the short hair material imparts an electric charge to the short hair material, and the sleeve base side is charged with a different electric charge;
3. The method of manufacturing a moisture-wicking sleeve for printing according to claim 2, wherein the short hair material is adsorbed to the outer circumferential surface of the sleeve base by the attraction action of both electric charges.