JP2749969B2 - roll - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to various rolls applied to a paper machine, a printing machine, a paper machine, and the like.

(Prior Art) In general, various surface modification methods are applied to various rolls used in a paper making machine, a printing machine, etc. in order to satisfy predetermined required functions such as paper peeling characteristics and ink adhesion characteristics. . For example, when it is desired to obtain a surface with low surface energy (hard to wet and hard to adhere), conventionally, as shown in FIG. 8, a low surface energy material (such as Teflon) is uniformly coated on the roll surface. use. In order to obtain surface properties intermediate between low surface energy and high surface energy, for example, as shown in FIG.
(High surface energy material) There is a method of precipitating Teflon particles (low surface energy material) on the surface to impart surface properties intermediate between Ni and Teflon.

To explain a conventional paper machine, FIG. 10 shows a press part of the paper machine, in which 1 is a top roll, 2 is a bottom roll, 3 is felt, and 4 is a wet paper. The wet paper web is dewatered while passing between the rolls together with the felt while being pressed. After pressing, the wet paper web adheres to the top roll, peels off, and is conveyed to the subsequent press part and dewatered again. At this time, the top roll surface must have good paper separation to prevent paper breakage.

At present, a granite roll or a substitute roll which has conventionally been considered to have good paper separation is used in many cases. This alternative roll mixes crushed granite in a polyurethane resin (low surface energy material) and aims at a roll surface with better paper separation than the granite roll (No. 11).
See figure).

(Problems to be Solved by the Invention) However, the above-mentioned modification method is a random pattern modification method, and the area ratio between the low energy part and the high energy part on the surface or the arrangement pattern thereof is not constant. Therefore, it has been difficult to obtain desired surface properties over the entire surface of the roll. In addition, in such a conventional random modification method, it is possible to obtain only surface properties substantially close to a predetermined target value,
The target value is not always satisfied.

Therefore, the present invention focuses on the fact that the surface physical properties (adhesiveness and peelability) are governed by the area ratio and disposition pattern of different materials, and the required surface roughness is reduced by a modification method suitable for various required functions. Rolls provided by the company.

(Means for Solving the Problems) For this reason, the present invention is to construct a low-energy fluorinated resin and a high-energy SUS material in the form of a roll, and the construction pattern is such that the fluorinated resin is in a striped shape or a grid that follows the roller rotation direction. They are arranged in an eye shape and are used as means for solving the problem.

(Operation) According to the present invention, by regularly arranging materials having different surface energies on the outer surface of the roll, specifically, by arranging them in a slit pattern or a patch pattern, the contact as shown in Table 1 is achieved. Angle control is possible.

From this, the optimum pattern can be selected based on the required function of the roll, and the entire surface of the roll can be modified by changing the area ratio.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a roll having a slit pattern as a first embodiment of the present invention, FIG. 2 is a perspective view of a roll having a patch pattern as a second embodiment of the present invention, and FIGS. 1 is a photograph of a specimen in a surface modification state according to a second example.

By the way, as parameters indicating the adhesion / peeling characteristics on the fixed surface, when the liquid moves on the solid surface, there are advancing contact angle generated in the traveling direction and receding contact angle generated on the opposite side to the traveling direction. It has been known.

Generally, the advancing contact angle, receding contact angle, and adhesion / peeling characteristics have the following relationship in the case of a macro-adhesive and a micro surface.

From the above, for example, in printing machines, paper machines, ink, glue, etc. to sufficiently adhere to the roll and transport,
It can be understood that a surface having a small advancing contact angle, or a surface having a large receding contact angle can be modified to form a roll with good paper separation in a paper machine.

In order to investigate the area ratio between the low surface energy material and the high surface energy material, and the relationship between the pattern and the contact angle, the present inventor used fluororesin for the low energy material and fluororesin for the high energy material.
SUS304 was selected, various test pieces were prototyped, and experiments were performed. The manufacturing procedure is to coat a SUS plate (55 × 55 × 0.5 ^t ) etched by a pattern with an arbitrary area ratio and pattern at a depth of 20 μm by overflowing with a fluororesin.硬化 1000 after resin curing
Polish with paper to create a coexisting surface of SUS304 and fluororesin.
The contact angle was measured according to the Wilhelmy method (pure water, sample immersion speed 5 mm / min), which is the principle of a surface tensiometer.

First Example FIG. 3 shows a specimen in which a fluororesin as the low surface energy material 5 and SUS304 as the high surface energy material 6 form a slit pattern, and FIG. Indicates the relationship between the area ratio of the high energy part (SUS304) and the contact angle. As can be understood from FIG. 5, in the case of the slit pattern, it is clear that both the contact angle and the receding contact angle decrease in proportion to the area ratio of the high energy portion.

From this, since the releasability from the solid surface depends on the receding contact angle as shown in Table 2, if this slit pattern is applied to a paper machine roller, and it is applied at an area ratio giving a predetermined contact angle, In addition, it is possible to control the wet paper web releasability (see FIG. 7) and to form a roll meeting the requirements.

Second Embodiment FIG. 4 shows a test piece in which a fluororesin as the low surface energy material 5 and SUS304 as the high surface energy material 6 form a patch pattern, and FIG. Indicates the relationship between the area ratio of the high energy portion and the contact angle. Generally, the advancing contact angle tends to be dominated by the low-energy portion of the dissimilar material, and the receding contact angle tends to be dominated by the high-energy portion. The results in FIG. It can be controlled by the change, but the receding contact angle cannot be controlled by the change of the area ratio.

In other words, as the wetting progresses, the meniscus is all
The SUS304 portion and the SUS304 + fluorine resin coexist surface alternately pass through, but the receding contact angle is determined by the portion having a high surface energy of both, ie, the portion of all SUS304. This indicates that in this patch pattern, the releasability cannot be controlled even when a low-energy material coexists. On the other hand, since the advancing contact angle depends on a portion having a low surface energy of both, the advancing contact angle can be controlled by increasing the ratio of the fluororesin on the meniscus.

Therefore, if this patch pattern is applied to the ink transport roller, the receding contact angle does not change, so that a surface that controls the adhesive characteristic (ink deposition on the roller) with the same ink peeling characteristic can be manufactured. For example, in order to improve the "glue" to the roller without impairing the releasability of the ink, the area ratio of the high energy portion may be increased as shown in FIG. In this case, it is desirable to reduce the size of the surface element so that the pattern of the surface element is not transferred when transferred to the next roll.

In addition, in addition to the slit pattern and the patch pattern in the first embodiment and the second embodiment, if the low surface energy material and the high surface energy material are regularly arranged and the pattern can control the peeling characteristics, It is not necessary to limit to the pattern.

(Effect of the Invention) As described above, unlike the conventional random pattern modification, the present invention constructs a low-energy material of fluorinated resin and a high-energy material of SUS in a roll shape. By arranging in a stripe or grid pattern according to the roller rotation direction, it is possible to control the wettability of the roll surface and change the surface chemical adhesion with the partner, and to cover the entire low-energy fluoric resin roll By changing the area ratio occupied and the modified pattern, it is possible to change the adhesiveness of the entire roll surface and control the adhesiveness and peelability with the partner.

[Brief description of the drawings]

FIG. 1 is a perspective view of a roll having a slit pattern according to a first embodiment of the present invention, FIG. 2 is a perspective view of a roll having a patch pattern according to the second embodiment, and FIG. FIG. 4 is a developed plan view of a patch pattern specimen according to the second embodiment, and FIG.
FIG. 6 is a diagram showing a contact angle measurement result of the slit pattern specimen according to the first embodiment, FIG. 6 is a diagram showing a contact angle measurement result of the patch pattern specimen according to the second embodiment, and FIG. First
FIG. 8 is a diagram showing the results of measuring the wet paper peeling force of the slit pattern specimen according to the example, FIG. 8 is a cross-sectional view of a conventional fluororesin coating roll, FIG. 9 is a plan view showing a conventional dispersion plating state, FIG. The figure is a side view of the conventional paper machine press part,
FIG. 11 is a plan view showing the surface of a conventional resin roller for a paper machine. Explanation of main parts in the figure 1... Top roll 2... Bottom roll 5... Low surface energy material 6... High surface energy material

Claims (1)

(57) [Claims] (1) A low-energy fluorinated resin and a high-energy SUS material are formed in a roll shape, and the laid pattern is such that the fluorinated resin is arranged in a stripe shape or a grid pattern in accordance with the roller rotation direction. roll.