JP3914297B2 - Dampening water supply roller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water supply roller of a fountain solution apparatus that supplies water onto a plate surface for offset printing.
[0002]
[Prior art]
Conventionally, offset printing plates have been supplied with dampening water so that ink is not received in hydrophilic non-image areas, and a resistance curtain is formed against oleophilic ink. A water-absorbing roller called a water rod is used for supplying the shimizu.
[0003]
FIG. 6 shows a known fountain solution apparatus for offset printing, wherein the water roller 22 is covered with brass or chrome or cloth soaked in a pan 21 containing the fountain solution 20; A doctor roller 23 covered with a water-absorbing cloth that contacts the roller 22 for water intermittently, a metallic transfer roller 24 transferred from the doctor roller 23, and an entire surface from the transfer roller 24. The dampening water that is uniformly spread and transferred is provided with two application rollers 26 that transfer the dampening water in continuous contact with the plate surface 25, and is transferred from the roller 22 for water. The water 20 is supplied uniformly to the plate surface 25 using the rollers 23, 24 and 26.
[0004]
The doctor roller 23 and the attachment roller 26 are water supply rollers called water rods, and the surfaces of these rollers are called Morton in the industry so that a moderate amount of dampening water can be sucked and supplied. A water-absorbing cloth band is used to wind the film around the roller circumference or to form a cloth cylinder.
[0005]
The water-absorbent fabric band used for the water rod is a velvet that is obtained by cutting loops on the surface of the fiber knitted in a pile shape so as to be able to absorb water that forms a good dampening water curtain on the plate surface. The fabric surface is dense, smooth and highly uniform, and has improved water absorption and water retention.
[0006]
[Problems to be solved by the invention]
However, since the conventional band for water rods is formed by cutting a loop, there are many fluffs and fluffs, and thread breakage is likely to occur and the durability is lowered. Further, if these lint pieces adhere to the surface of the plate or the inking device, the printed pattern may be damaged. Accordingly, it takes time to take care of removing the lint before using the new roller, and management of the cloth on the roller surface requires great care. Further, the work of winding the conventional water-absorbing cloth on the drum circumferential surface of the roller requires skill, and the exchange of dirty or worn cloth is troublesome for an unskilled worker.
[0007]
The present invention has been made in view of the above-mentioned problems, and improves the durability of the cloth for the water supply roller and facilitates maintenance that can maintain the proper dampening state by making the contact of the roller with the plate surface dense. It is to be made.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an offset printing dampening water supply roller in which the surface of a roller body is covered with a tubular cloth body, and the tubular cloth body is formed by ultrafine fibers knitted with superfine fibers. It was made to be detachably fixed by squeezing the fastening string attached to the openings formed at both ends.
[0009]
In addition, by forming the tubular fabric body with ultra-fine fibers knitted in a loop shape, it is difficult to loosen or loosen the yarn, making it soft and good in water contact and water retention with good contact with the plate surface. An excellent water supply roller can be obtained.
[0010]
By forming the tubular fabric body seamlessly by knitted weave, the uniformity of the surface of the roller is improved and the contact property with the plate surface is further improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 1 to FIG. 5 show an embodiment of a dampening water supply roller of the present invention, which is a well-known roller used for a dampening roller or a doctor roller for supplying dampening water to a plate surface for offset printing. The roller body 1 and a cloth tubular cloth body 2 that covers the roller body 1 are configured.
[0013]
The tubular fabric body 2 is mainly made of knitted fabric that is knitted in pile knitting, that is, looped, as shown in FIG. The fiber is formed in a stretchable tubular shape with no seam (see FIG. 3).
[0014]
The ultra-fine fiber knitted by this ultra-fine yarn has a three-dimensional structure with a high porosity, and has a higher impregnation rate of dampening water than a conventional water-absorbent velvet cloth called Morton in the industry, In addition, the dampening water is well retained based on the capillary phenomenon caused by the ultrafine yarn.
[0015]
In addition, the ultra-fine fiber used in the tubular fabric body 2 is less likely to be unraveled and loosened because the loop is not cut, and is more durable than conventional water-absorbent fabrics. The water supply cloth is suitable for dampening work for offset printing with little occurrence.
[0016]
When the tubular cloth body 2 is put on the roller body 1, it is soft and smooth so that it can be supplied with good water on the plate surface without being twisted or loosened by the stretch of the roller cloth 1 because of its stretchability. A smooth roller surface.
[0017]
In addition, the tubular fabric body 1 has a close contact with the plate surface due to the properties of the ultra-fine fibers of the ultra-fine fibers, and further has no seams, so that the roller surface is excellent in uniformity and the plate surface is not uneven. A resistance curtain against ink by dampening water can be formed.
[0018]
The tubular cloth body 1 covered with the roller body 1 is detachably fixed by squeezing the opening 4 with the laces 3 at both ends thereof.
[0019]
Therefore, when the tubular cloth body 2 is worn or damaged, the replacement is easy, and installation does not require the skill of winding a conventional water-absorbing cloth around a roller. In addition, when dirty, it can be washed and reused, which is economical.
[0020]
The method of knitting the ultrafine fibers is not limited to knit weave, and as shown in FIG. 5, the ends of the hairs are raised to form a moquette (a state in which the ends of the hairs are raised vertically). The super fine fibers may be formed into a tubular body to form a tubular cloth body, and can have substantially the same function as the previous embodiment.
[0021]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0022]
The surface of the roller body is covered with a tubular fabric made of ultrafine fibers knitted with ultrafine yarn, so that the stretchability of the tubular fabric makes it closely close to the circumferential surface of the roller body, compared to conventional water supply rollers. As a result, a smooth roller surface with extremely high water absorption and water retention is formed.
[0023]
And, by forming the tubular fabric body seamlessly with the ultrafine fibers knitted in a loop shape, the roller surface is soft and the uniformity is improved, and the contact property to the plate surface is extremely high due to the properties of the ultrafine fibers of the ultrafine fibers. It becomes dense and can form a resistance curtain with dampening water in the best condition with no unevenness on the printing plate.
[0024]
In addition, the ultra-fine fiber knitted in a loop shape has less fluff and fluff and less thread breakage. Therefore, the maintenance time before use of the new water supply roller can be shortened, and the durability is excellent and economical.
[0025]
Further, since the tubular cloth body can be easily attached to and detached from the roller body, it is a water supply roller that is easy to maintain without requiring skill in replacement work when it is damaged or dirty.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a dampening water supply roller of the present invention.
2 is an enlarged sectional view taken along arrow XX in FIG.
3 is a perspective view of a tubular cloth body of the roller of FIG. 1. FIG.
FIG. 4 is an enlarged view for explaining ultrafine fibers used in the present invention.
FIG. 5 is an explanatory enlarged view showing another embodiment of the ultrafine fiber used in the present invention.
FIG. 6 is an explanatory view showing a conventional fountain solution device.
[Explanation of symbols]
1 roller body, 2 tubular cloth body,

Claims (3)

  An offset printing dampening water supply roller in which the surface of a roller body is covered with a tubular cloth body, wherein the tubular cloth body is formed of superfine fibers knitted with superfine yarns and openings formed at both ends. A dampening water supply roller characterized in that it is detachably fixed by squeezing a tightening string attached to the water.   2. The dampening water supply roller according to claim 1, wherein the tubular cloth body is formed of super fine fibers knitted in a loop shape.   The dampening water supply roller according to claim 1 or 2, wherein the tubular cloth body is formed seamlessly by knitted weave.

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