JPS61205191A - Water-bar roller cover for offset printer - Google Patents

Abstract

PURPOSE:To reduce damage to the blade of shearing machine or to paper grinder by a method in which the finishing of piles of PVC yarns raised and uniform raising is brought about on the surfaces of the piles by using the PVC pile yarns subjected to a specific process. CONSTITUTION:By using long PVC yarns of at least 30 times half twist per inch as pile yarns 1, piles 3 erected in an individually twisted state are formed. and raised portions 3a are formed by applying shearing process or paper grinder process to the tips of the piles 3. If half twisting less than 30 times per inch is applied to the piles 3, piles 3 having straight raising property could not be obtained because twisting occurs during knitting period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water roller cuckoo for an offset printing press, and more particularly to a water supply cover for a printing plate used for a water roller for an offset printing press.

[Conventional technology]

Conventionally, this kind of Suishin roller cover is generally knitted into a cylindrical shape using a stockinette circular knitting machine and has loop holes formed entirely on the outer surface, or a product cut from this pile. There are also molded products made of synthetic resin. However, the former is mainly used.

[The problem that the invention attempts to solve]

The present invention improves the braided product by 1% of the above-mentioned flat covers. Conventionally, this material is L-? ll-
Cotton, rayon, vinylon, etc. are used, but they generally have low strength. Therefore, the use of high-strength vinylon, that is, polyvinyl alcohol fiber that has been stretched under high heat and strength, has been considered.This fiber has good strength and water absorption, and it is desirable to construct this fiber as a nogile yarn. However in this case.

Processability is poor and manufacturing efficiency is significantly reduced. That is, the third
The structure shown in the enlarged structural diagram in the figure is the one formed in Ill.

When performing shirring or sandpaper ξ-processing, the nocil 5 hits the cutter and sandpaper 7c and causes the uneven raising of 5a, causing significant heat generation due to friction and damaging the sandpaper ξ- and cutter. In particular, the life of sandpaper ξ- is significantly shortened. In addition, the pile is torn and a large amount of fibers are scratched with sandpaper, making it difficult to raise the desired surface. The present invention solves this difficult problem.

[Means of writing to solve problems]

In other words, the present invention utilizes, as the pile yarn 1, a yarn with all the long fibers of polyvinyl alcohol fibers twisted in a single twist of 30 times per unit (in total, 30 times per unit). ) The disadvantages of the conventional method are to completely form the ξ file 3 and then perform shirring and/or paper grinder treatment on the tip to form the rainbow raised part 3ai. It has been removed.

The pile yarn (needle yarn) (1 in Fig. 1-2) used in the present invention is a so-called high-strength vinylon, that is, a polyvinyl alcohol-A [fiber that has been stretched under high heat and strength, for example,
000d/600f-1200d/600f (d is denier, f is filament) and has a strength of about 7.5 r/d when immersed in water at 15°C. Also, the bobbin thread (first
, 2) in Figure 2 (thread formed into a cylindrical shape, also known as the axis thread), for example, a parlock type of vinylon spun thread costs $20.
#30 is preferable, and the chisel-lock type is made of tow, that is, fibers of various lengths that are pulled and torn off.It is made of gold threads twisted together and has a high tensile strength, 7.5 f/d when immersed in water.
f Show. This one is also about 650d, same as above.

It is important that the oil yarn is twisted in one direction, and that the twist is 30119 inches or more. If it is less than this, when knitted, it will twist and stand up straight as shown in Figure 2.
No leakage occurs. If it is 30 times or more, the more the better, but if it is too loose, it may cause trouble during knitting, so it is not preferable.

In addition, hot air treatment for 1 to 10 minutes at a temperature of around 10 degrees and around 150 degrees Celsius? When applied, the fibers become flexible and can be twisted to a high degree on one side, making it easier to perform the tiA standing treatment.

〔Example〕

For the upper thread ( ) ξ tile thread), one long fiber high-strength vinylon manufactured by Kuraray Co., Ltd., 1000d/600 f was used, and for the bobbin thread (axis thread), the same slot-lock type snog (manufactured by Kuraray Co., Ltd.) was used. Wire number equivalent to Nbiniron thread: 1 #20i, 2 #30
I used this book.

The circular knitting machine is based on the circular knitting machine manufactured by Kotani Hosiery Machinery Works.

A product having a pile structure shown in Figure 2 was obtained.

Using a Resin Belter BH-47 type bevel grinder manufactured by Matsushita Electric Tools Co., Ltd., the surface of the needle was cut into paper ξ- by Riken Corundum Co., Ltd. Endless Spreader Grinder #150. A roller cutter of the present invention was obtained.

〔effect〕

As mentioned above, the water rod roller force of the present invention is the first
As shown in the figure, the soil is neatly raised, and its surface is evenly brushed. Also, the heat generated during the brushing process is extremely low, making it difficult for O-grinders and shearing blades to be damaged, resulting in efficient work. <Can be processed.

The cover has good shrinkability with water and is extremely strong, so it can be firmly attached to a special mounting machine when attached to a roller, making it extremely effective as a water god cover.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an enlarged model of the entire structure of the force of the present invention, Fig. 2 is an explanatory diagram showing the state before processing with a bevel grinder, and Fig. 3 is an explanatory diagram showing the state before processing with a bean grinder. It is an explanatory view showing the state of the cover by grinder processing. l... Pile thread, 2... Lower thread, 3... Twisted tano ξ ile. 3a...Napped part

Claims (1)

[Claims] In a water rod roller cover knitted with a dense pile on one side using yarn made of polyvinyl alcohol fiber, the yarn is made of long fibers of polyvinyl alcohol fiber as the pile yarn, with at least 30 single twists per inch. 1. A water rod roller cover for an offset printing press, characterized in that the pile is individually twisted to form an upright pile, and the tip of the pile is subjected to shirring and/or paper grinding treatment.