JPH04213545A - Fly cylinder - Google Patents

Abstract

PURPOSE:To improve the abrasion resistance of a fly cylinder and increase the friction coefficient thereof by forming a flame sprayed film on the cylinder. CONSTITUTION:In the fly cylinder comprising the assembly of a roll body 6 and a collar 9, the powder of Al2O3 or Cr2O3 is flame sprayed on the surface of the collar 9, thereby forming a frame sprayed film 10 having a maximum height of between 40 and 70mum Rmax, mean surface roughness of between 5 and 10mum Ra, and projections between 40/cm and 60/cm.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to paper rolls for printing machines and the like.

0002

2. Description of the Related Art FIG. 4 shows a typical example of a roll arrangement diagram in which a paper drawing roll is used. In this figure, the web 5 is flowing from the paper pull rolls 1 and 2 toward the rolls 3 and 4, and the paper pull rolls are used for one of the purposes of controlling the tension of the web between these rolls. This control is mainly performed by changing the peripheral speed of the paper pulling roll. A typical example of a conventional paper pulling roll is shown in FIG. 5. In FIG. 5(a), 6 is the main body,
7 is a stepped collar and is mainly made of steel. The stepped collar 7 is normally used as shown in Fig. 5 (b) with the aim of increasing the coefficient of friction with the paper.
), there are gear tooth-shaped slits (2) on its surface.
mm (width x 2 mm (depth)) or serrations or the like. Further, from the viewpoint of preventing wear, the surface thereof is plated with Cr. In consideration of maintenance when wear occurs during use, many are of the split type as shown in the figure.

0003

[Problems to be Solved by the Invention] In the case of conventional paper rolls, although the surface of the roll is processed with slits, serrations, etc. aimed at increasing the coefficient of friction, the shape of the roll as a whole (including the stepped portions) is ) is 0.
．． It is about 18. Therefore, when this roll is used, there is a problem that sufficient tension cannot be applied to the web, which causes wrinkles or tears in the paper. Further, even if the roll surface is coated with hard Cr plating (film hardness: about Hv900), there is a problem in that it is worn out by sliding with the web and the coefficient of friction changes over a long period of use.

[0004] The present invention provides a roll suitable as a paper drawing roll, which uses a material with superior wear resistance compared to conventional rolls and has a high coefficient of friction.

[0005]

[Means for Solving the Problems] The structure of the present invention for achieving the above object is to provide a paper roll consisting of an assembly of a roll body and a collar, with a maximum height of 40 to 70 μm Rmax on the surface of the collar. , average roughness 5-10
It is characterized in that a thermal sprayed coating is formed by thermally spraying Al2O3-based or Cr2O3-based powder so that the number of peaks of protrusions is 40 to 60/cm.

[0006]

[Operation] The present invention provides that the thermal spray coating made of Al2O3 or Cr2O3 powder sprayed onto the surface of the collar by the above method increases the coefficient of kinetic friction of the paper roll and generates a large frictional force between the paper and the roll. Obtainable.

[0007]

[Example] In order to increase the frictional resistance with paper, it is generally better to increase the roll surface roughness within a range that does not damage the paper. A film cannot be obtained through management. The present invention is characterized in that it has sharp protrusions and its surface is processed by paying attention to the cross-sectional shape of the roughness such as the number of the protrusions. That is, when looking at the surface of paper microscopically, fibers are irregularly intertwined, and fine fibers are fluffed in the direction perpendicular to the surface of the paper. In order to obtain a large frictional resistance in contact with such a paper surface, it is desirable to have a surface structure in which countless triangular pyramid-shaped protrusions 8 with a rough surface stand up as shown in FIG. With this shape, when the paper is pressed against the roll surface, the triangular pyramids stick to the paper fibers, and the fibers become entangled in the rough surface of the triangular pyramids, creating a large frictional force between the paper and the roll. be able to.

FIG. 2 shows a structural diagram of the thermal spray type paper roll of the present invention. FIG. 2(a) shows the roll state after assembly, which consists of a main body 6 and a collar 9 on which a thermally sprayed coating 10 has been thermally sprayed. FIG. 2(b) shows the division situation with color. The manufacturing method for this roll will be described below. First, the main body and collar are assembled as shown in Figure 2(a), and the collar surface is thermally sprayed.
As a pretreatment, oil is removed using trichlor, followed by blasting. Next, Al2 O3 system or C
Thermal spray coating 10 is formed by gas plasma spraying using an r2O3-based powder material. Post-processing such as hole sealing treatment is not performed on the coating 10 after thermal spraying.

FIG. 3 shows the measurement results of the surface roughness of each roll and the coefficient of dynamic friction with paper. The product of the present invention has a surface roughness as shown in A in the figure and has protrusions 11 on the surface. As an example, the maximum height of surface roughness is 40 to 70μm Rm
The thermal spray roll made by controlling the surface so that the number of protrusions (peak count) is 40 to 60/cm with an average roughness of 5 to 10 μm Ra, has a dynamic friction coefficient shown in the first column. So about 0. 7 and the conventional roll is 0. It can be seen that this is a significant improvement compared to 18.

0010

[Effects of the Invention] As described above, according to the present invention, the maximum height Rm a of 40 to 70 μm is formed on the collar surface of the roll body.
x Average roughness 5-10μm Ra and number of protrusions 40
~60 pieces/cm Al2O3 type or C
Since it forms a thermally sprayed coating by thermally spraying r2 O3 type powder, it has the effect of easily and inexpensively obtaining a roll that has high frictional resistance with paper and wear resistance without significantly changing the conventional roll configuration. .

[Brief explanation of the drawing]

[Fig. 1] Showing one embodiment of the present invention, a is a perspective view, and b is a perspective view.
is a partially enlarged perspective view.

FIG. 2 shows an embodiment of the present invention, where a is a side view and b is a side view.
is an exploded sectional view thereof.

FIG. 3 is a measurement diagram of the surface roughness of a roll.

FIG. 4 is a roll arrangement diagram.

FIG. 5 shows a conventional example, in which a is a side view and b is an exploded sectional view thereof.

[Explanation of symbols]

6 Roll body 9 Color 10 Thermal spray coating

Claims (1)

[Claims] 1. In a paper roll consisting of an assembly of a roll body and a collar, the collar has a surface having a maximum height of 40 to 70 μm R max and an average roughness of 5 to 1 μm.
0μm Ra and number of protrusions 40-60 pieces/cm
A paper roll characterized in that a thermally sprayed coating is formed by thermally spraying Al2O3-based or Cr2O3-based powder so as to have the following properties.