JP2534347Y2 - Blanket cleaner for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blanket cleaner used for automatically cleaning a printing press blanket.

[Related Art] An offset printing machine is a method of printing by transferring ink to a blanket made of NBR or the like, and further transferring the ink to paper. In such offset printing, it is necessary to wash the blanket to remove the ink and the water applied before applying the ink, every time the plate changes or when the printed material bleeds.

Conventionally, such blanket cleaning has been performed manually, but in order to save labor and prevent danger, automatic cleaning machines that automatically remove ink and water have become widespread. As a cleaning material of this automatic washing machine, generally, a heat-sealing type, a binder type, and a water entanglement type nonwoven fabric have been used.

There are cases where the whole surface of the non-woven fabric is heat-sealed and some cases where it is partially welded. In the former case, the whole surface is smooth and has no fine pores, so it has no wiping property and liquid absorption. , The blanket could not be sufficiently cleaned. In the latter case, free fibers are present in portions where fibers are not fused with each other, so that fiber waste adheres to the blanket, causing inconvenience in printing or elongation, which tends to cause wrinkles. Therefore, uniform cleaning was not possible. Further, depending on the roll pattern at the time of fusing, there is a drawback that a vertical streak is generated during cleaning, resulting in poor cleaning performance.

Next, also in the case of a nonwoven fabric bonded by a binder, there are a case where the entire surface is bonded and a case where the nonwoven fabric is bonded partially as in the case of the nonwoven fabric by heat fusion, but in each case the same as in the case of heat fusion In addition to the above problem, since the fiber surface is covered with the binder, there is a drawback that only a nonwoven fabric having a lower liquid absorbing property can be obtained.

In the case of a non-woven fabric formed by hydroentanglement, the fibers are merely intertwined with each other. There was a drawback that they were slippery, weakly entangled, stretched and wrinkled, and could not be uniformly cleaned.

In addition, according to the water entanglement method, vertical streaks are formed at intervals of the nozzles in the longitudinal direction of the cleaning material itself. Therefore, when the blanket is washed, vertical streaks are generated, and cleaning failure is likely to occur.

In addition, all of the above three types of nonwoven fabrics were relatively poor in wiping properties because the fibers used were relatively thick, and the blanket could not be sufficiently cleaned.

[Problems to be Solved by the Invention] The present invention has been made in order to solve the above-described drawbacks, and provides a printing press blanket cleaner which does not cause vertical stripes and is excellent in cleaning of a printing press blanket. The purpose is to:

[Means for Solving the Problems] In a blanket cleaner for a printing press provided with an unwinding roll 2, a winding roll 3, and a pressure pad 4 of a cleaning material 1, the cleaning material 1 is mainly composed of split fibers. A blanket cleaner 5 for a printing press, which is made of a nonwoven fabric which is formed by laminating a cross web and a unidirectional web and is entangled with water, and arranged so that the cross web side of the cleaning material 1 is in contact with a blanket 6.

[Operation] The cleaning material 1 of the printing press blanket cleaner 5 of the present invention is a nonwoven fabric in which a laminated web composed of a cross web mainly composed of split fibers and a unidirectional web is entangled by a hydroentanglement method. The use of the split fibers and the contact of the cross web with the blanket 6 improve the wiping properties, liquid absorption properties, and strength.

First, the cleaning material 1 of the present invention becomes an ultrafine fiber by dividing the split fibers, and thus exhibits excellent wiping properties. In other words, conventional fibers have a large fiber diameter, so that fine dirt cannot be removed. On the other hand, the ultrafine fibers generated by splitting the split fibers of the present invention are compared with conventional fibers. Since the fiber diameter is about one-tenth, fine dirt can be scraped off. In addition, since the fiber cross section of the ultrafine fiber obtained by dividing a fiber having a circular cross section is usually a fan type or a substantially rectangular shape, it is easier to scrape off dirt at the corners of the microfiber. .

Secondly, the presence of ultrafine fibers obtained by splitting split fibers as in the present invention easily exerts surface tension and capillary action, thereby exhibiting excellent liquid absorbing properties. That is,
The pores formed by the entanglement of the ultrafine fibers form much finer pores than the pores of a nonwoven fabric formed of fibers of the same diameter as the conventional ones. It is easily absorbed by the surface tension.
Also, when a large amount of ink or water has entered, the diameter of the ultrafine fibers is small, so that the capillary phenomenon is more likely to occur and the liquid absorbing speed is higher than in the conventional case. In addition, in the present invention, since the laminated web composed of the cross web and the unidirectional web is used as the nonwoven fabric entangled by the hydroentanglement method,
Due to the action of the cross web, the ink and water are diffused throughout the cleaning material, and the absolute amount of liquid absorption increases.

Third, the strength is dramatically improved due to the fine entanglement caused by the ultrafine fibers generated by splitting the split fibers by the water flow. This is because the diameter is smaller than that of a fiber having a conventional diameter, so that the fiber is easily entangled. In addition, when the majority of the cross web is composed of split fibers, and the majority of the unidirectional web is made of ordinary fibers having a denier of about 1 to 5 deniers, the extra fine fibers obtained by dividing the fibers of the ordinary diameter are used. Since it is in a fixed hedge-like state where bamboos are tied with ropes, the strength is significantly improved.

Further, the cleaning material 1 in the present invention is obtained by entanglement of a laminated web composed of a cross web and a unidirectional web by a hydroentanglement method.
Since the tensile strength of the cleaning material 1 in the longitudinal direction is improved, there is no possibility that the cleaning material 1 is wrinkled during use to cause cleaning failure.

Fourth, by setting such a cross web of the cleaning material 1 so as to be in contact with the blanket 6, no vertical stripes are formed. In other words, the cross web is macroscopically arranged with fibers arranged in a rhombus, so that when the blanket 9 is wiped, the fibers come into contact with the surface compared to the one-way web. In addition to excellent cleaning properties, no vertical stripes are formed, and excellent cleaning properties are exhibited.

As described above, the blanket cleaner 5 of the present invention provides excellent blanket cleaning performance only by using ultrafine fibers derived from split fibers, laminating a unidirectional web and a cross web, and using a cross web surface for the blanket 6. It has been achieved.

The split fibers used in the present invention are divided into a large number of ultrafine fibers by a water flow, and as described above, the divided ultrafine fibers have various effective properties such as wiping properties, liquid absorbing properties, and strong entanglement properties. Work well.

The split fiber referred to in the present invention has a thickness of about 1 to 5 denier, and becomes ultrafine fiber of about 0.05 to 0.5 denier by being split. Such a split fiber is made of a resin having two or more different components, for example, a polyamide resin and a polyester resin, a polyamide resin and a polyolefin resin, a polyamide resin and a polyacrylonitrile polymer resin, and a polyester resin and polyolefin. Resin, a combination of a polyester resin and a polyacrylonitrile resin, and a combination of a polyolefin and a polyacrylonitrile polymer resin. Although only two components are illustrated, it goes without saying that three or more components may be used as long as they can be divided to form ultrafine fibers.

The components of the ultrafine fibers may be arranged in any manner.For example, in a fiber cross section, a chrysanthemum-like fiber in which one component is radially arranged between other components, the other component is dispersed in an island shape in one component. Sea-island fibers, and bimetallic fibers in which different components are alternately laminated in layers.

In the cleaning material 1 of the present invention, the split fibers are indispensable in the cross web, but are preferably contained in the unidirectional web, but are not essential. This is because, in the present invention, since the cross web side is pressed against the blanket 6, it is the cross web constituent fibers that are actually wiped. Therefore, it is necessary that the cross web of the cleaning material 1 contains at least 50% by weight of the split fibers. When printing is performed by using hydrophilic fibers such as cotton fibers, rayon fibers, vinylon fibers, and polyamide fibers, and polyolefin-based and polyester-based hydrophobic fibers as the fibers other than the split fibers constituting the cross web. Water and ink used in the present invention can be improved in water absorption and oil absorption.

On the other hand, in the case of a unidirectional web, the same split fibers, hydrophilic fibers, and hydrophobic fibers as the cross-web constituent fibers can be used.

The cleaning material 1 of the present invention is obtained by forming a cross web and a unidirectional web using the above-described fibers and laminating them.

The unidirectional web referred to in the present invention is, for example, a web in which fibers which are usually opened by a carding machine are arranged substantially parallel to the longitudinal direction of the web. The web has a function of giving the cleaning material 1 strength enough to withstand a frictional force when the blanket 6 is washed.

On the other hand, the crossed web is, for example, a one-way web opened by a card machine, a one-way web is supplied by a cross layer from a direction perpendicular to the flow direction of the conveyor, and the crossed web is folded at an edge of the conveyor. And a fiber web obtained by crossing by reciprocating both ends of a conveyor.

The cross web formed in this way changes the cross angle of the fiber depending on the traveling speed of the conveyor and the turning speed of the cross layer. This crossing angle is preferably oriented so as to have an angle of 30 degrees or more with respect to the flow direction of the conveyor, and when the angle is less than 30 degrees, the properties are similar to those of a unidirectional web. However, the effect of using the crossed web, that is, the excellent cleaning property of wiping so as not to cause vertical streaks, cannot be exhibited.

Further, the crossing web and the one-way web need not be one layer each, and a lamination method in which three layers are provided and the one-way web is disposed in the middle may be used. However, when the one-way web comes into contact with the blanket 6, a vertical streak is formed, so it is necessary to avoid that both outermost layers become one-way webs.

The fiber webs thus laminated are entangled by the water flow.

A conventional entanglement method is to use a needle punch.However, when performing needle punching, splitting of split fibers occurs only at the point where the needle acts, whereas It can be made to act on a wide area of the fiber web regardless of whether it acts directly or the reflected flow acts, so that the split fibers are easily split and the entanglement becomes stronger.

It is necessary to select whether the entanglement due to the water flow acts from the cross web side or the one-way web side according to the principle of the water entanglement. In other words, when water entanglement mainly divides split fibers by direct water flow, it is necessary to split the split fibers by acting from the cross web side, and entanglement by reflected flow rather than direct water flow acts Is required, it is necessary to act from the one-way web side and split the split fibers on the cross web side by the reflected flow, so it is necessary to consider the working surface of the water flow.

When the water flow is applied not only once but also several times, it is possible to perform more uniform division and entanglement by acting alternately from the back and front of the fiber web.

By applying the water flow in this manner, the entangled nonwoven fabric cleaning material 1 is arranged as shown in FIG. The most important thing in this arrangement is to arrange the crossed web side so as to contact the blanket 6. By arranging the cleaning material 1 in this manner, since the constituent fibers of the cross web are ultrafine fibers obtained by dividing the split fibers, it is possible to scrape dirt not in the line of the cross web constituent fibers but in the surface direction. Since the fiber diameter is small and the fiber diameter is small, it has excellent wiping properties, no vertical streaks, and excellent cleaning properties.

The unwinding roll 2 of the present invention winds the above-mentioned cleaning material 1 and sequentially sends out the cleaning material 1. The material of the unwinding roll 2 is not particularly limited, and a material made of paper, plastic, or the like may be used.

The cleaning material 1 sent out from the unwinding roll 2 is taken up by a take-up roll 3. Similarly to the unwinding roll 2, the material of the winding roll 3 is not particularly limited, and a material made of paper, plastic, or the like may be used.

The pressing pad 4 of the present invention presses the cleaning material 1 against the blanket 6 so that the blanket 6 is pressed.
Since it functions to remove the above water and ink, a material which can be expanded with air so that pressure is uniformly applied to the blanket 6 is generally used. However, sponges, felts, and the like obtained by a method of foaming a resin made of a thermosetting resin, a thermoplastic resin, or the like can also be used.

It is more preferable that the press pad 4 be wrapped with a Teflon sheet or the like because the press pad 4 may be contaminated through the cleaning material 1 from which water and ink of the blanket 6 have been removed.

When a blanket cleaner having the above-described configuration, for example, a pressure bonding pad 4 that expands with air is used, the following operation is performed.

First, the cleaning material 1 unwound from the unwinding roll 2 is sent up to the pressure pad 4. Thereafter, the pressure pad 4 is expanded by air, and the cleaning material 1 is pressed against the blanket 6. By doing so, after removing water and ink from the blanket 6, the air from the pressure bonding pad 4 is evacuated and shrunk, and then the winding pad 3 is wound up. Such an operation is repeated every time the blanket is washed.

In order to make it easy to remove water and ink on the blanket 6, water and washing oil may be dyed between the unwinding roll 2 and the pressure pad 4, or water and washing oil may be directly applied to the blanket 6. May be applied.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[Examples] (Examples) 65% split fiber having a chrysanthemum-shaped cross section composed of polyester resin and nylon resin (fineness: 2 denier, fiber length: 38 mm, trade name, manufactured by Kanebo Co., Ltd., Verima X), rayon fiber (fineness: 45g per unit of 1.5 denier, fiber length 38mm) 35%
and / intersection of m ² web, polyester fibers (fineness 1.5 denier, fiber length 38mm) 50%, and rayon fibers and unidirectional web (fineness 1.5 denier, fiber length 38mm) basis weight 15 g / m ² consisting of 50% stacked . The angle between the cross web and the unidirectional web was dispersed in the range of 35 to 50 °.

By applying a high-pressure water flow of 120 kg / cm ² from a plurality of nozzles to the laminated fiber web, a cleaning material 1 having a basis weight of 60 g / m ² , which is almost uniformly divided and entangled.
I got The water entanglement was performed three times in the order of the cross web side, the one-way web side, and the cross web side, and the split fibers were split and the fibers were entangled.

The cleaning material 1 thus obtained is wound around an unwinding roll 2 made of plastic as shown in FIG. 1 so that the one-way web side is on the inside, and is wound by a winding roll 3 at the end of the cleaning material 1. It was arranged so that it could be taken.
In addition, the sponge wrapped with the Teflon sheet was used for the pressure bonding pad 4.

(Comparative Example 1) The cleaning material obtained in exactly the same manner as in Example 1 was used, and the cleaning material was arranged in exactly the same manner as in Example 1 except that the crossed web side was wound inside the unwinding roll in reverse. did.

(Comparative Example 2) Polyester fiber (fineness 1.5
Denier, fiber length 38mm) 50%, rayon fiber (fineness 1.5
A cleaning material was obtained in exactly the same manner as in Example 1 except that a unidirectional web having a basis weight of 15 g / m ^{2 and} a denier of 50% was used.

The cleaning material thus obtained was arranged as shown in FIG.

(Physical Properties Test) The tensile strength, tensile elongation, 10% modulus, and pilling resistance of the cleaning material 1 obtained in Examples and Comparative Example 2 were measured according to JIS.
It was measured according to L-1096. The results are shown in Table 1.

As is clear from Table 1, the physical properties of the examples, particularly the tensile strength when wet and the 10% modulus, are far superior to the comparative example 2 as a cleaning material for blankets.

(Wipeability test) After mixing solvent 9 with water 1, ink was added to prepare a mixed solution. 2 cc of the mixed solution is spread on the NBR rubber, and the cleaning material 1 used for the blanket cleaner for the printing press of the example and the comparative examples 1 and 2 is placed on the mixed solution thus obtained, and 500 g of the cleaning material is placed. The degree of wiping property was judged by visually observing the state of the rubber surface after applying 10 cm at a constant speed while applying a load.

In addition, the cleaning material of the example removed the mixed solution on the cross web surface, and the cleaning material of the comparative example 1 removed the mixed solution on the unidirectional web surface.

As a result, the wiping property was class 5 when the crossed web side of the example was used, and when the one-way web side of the comparative example 1 was used and when the cleaning material of the comparative example 2 was used, Was also third grade. The criteria for determining the grade are as follows.

Class 1 The liquid absorption is remarkably inferior, vertical streaks occur and the wiping properties are remarkably inferior.

Class 2 Poor absorption of liquid, vertical streaks and poor wiping properties.

Class 3 Despite the liquid absorption, it has vertical streaks and poor wiping properties.

Class 4 There is some liquid absorption, but some vertical streaks occur.

Class 5 Excellent in both liquid absorption and wiping.

As described above, the cleaning material 1 of the present invention has excellent wiping properties by wiping on the cross web side, and has excellent liquid absorbing properties and vertical streaks which have not existed conventionally by using split fibers. You can see that.

[Effects of the Invention] Since the cleaning material of the blanket cleaner of the present invention is divided into split fibers to become ultrafine fibers, it exhibits excellent wiping properties, liquid absorbing properties, and strength.

In addition, since the crossing web side of the cleaning material is installed so as to contact the blanket, no vertical stripes are generated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a printing press blanket cleaner of the present invention. 1 ... cleaning material 2 ... unwinding roll 3 ... winding roll 4 ... pressure bonding pad 5 ... blanket cleaner 6 ... blanket

Claims (1)

(57) [Scope of request for utility model registration] 1. A blanket cleaner for a printing press provided with an unwinding roll 2, a take-up roll 3, and a pressure bonding pad 4 of a cleaning material 1. The cleaning material 1 is one of a cross web mainly composed of split fibers. The cleaning material 1 is made of a nonwoven fabric which is formed by laminating directional webs and entangled with water.
A blanket cleaner for a printing press, wherein the crossed web side of the blanket contacts the blanket 6.