JPS60264010A - Method of cutting semisynthetic paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cutting method for producing an insulating paper tape from semi-synthetic paper used as an insulating paper for ultra-high voltage electrical cables or electrical equipment.

(Prior art) (Problems to be solved) With the recent trend of ultra-high voltages in power transmission, insulators that meet this demand are required not only for power cables but also for various electrical devices. The insulating paper used also has high withstand voltage and resistance! In order to improve the properties, for example, a laminated semi-synthetic paper has been produced in which a layer of plastic film or fiber such as polypropylene or TPX, either alone or mixed as kraft paper, is provided between two sheets of kraft paper.

When cutting this kind of semi-synthetic paper ↓ insulating tape,
Like ordinary insulating paper, it had the problem of delamination when cut.

For example, as shown in Fig. 1, semi-synthetic paper is kraft paper 1,
To explain the semi-synthetic paper which has a three-layer structure with a polypropylene film laminated between them, conventionally, semi-synthetic paper is used between the disc spring upper blade 3-4 and the roller sweat blade 3-4 as shown in Fig. 4. A method was used in which cutting was performed continuously by rotating the upper and lower blades by rotating the upper and lower blades. Therefore, as shown in the same figure, since shearing force is applied when cutting the semi-synthetic paper, peeling between the eyebrows and elongation of the edges are observed in the semi-synthetic paper, and as shown in Fig. 5, the kraft paper layer 1 of the semi-synthetic paper and polypropylene layer 2
The peeled part Sf is sandwiched between 6°6 heat rolls and the polyzolopyrene is fully heat fused to the peeled part.

It was necessary to re-glue the part S, but it was difficult to glue it all the way through due to shearing.

(Means for solving all the problems) The present invention was made in view of the above-mentioned circumstances, and when cutting semi-synthetic paper, the cutting line is heated and fused in advance or at the same time, and the cutting line does not generate any shearing noise. This is a method of pressing and friction cutting.

In the present invention, the term "plastic sheet" includes film and paper.

(Operation) According to this method, the cut portion is completely fused and cut by frictional force, so that the above-mentioned drawbacks do not occur.

C*Example) When cutting semi-synthetic paper as shown in FIG. 1, the present invention uses an underheater roll heated by a sheathed heater (not shown) as shown in FIG. A semi-synthetic paper is sandwiched between the cutter 3-1 and the heat cutter 3 above it, and the heat cutter consists of a cutter 3-1 in the center and a plate heater 3-2 that completely heats it, and an under heater roll. is supported by a spring that biases the upper side of the shaft 5 metal.

Therefore, the semi-synthetic paper is heated at the cutting part, and the propylene film layer 2 in the middle is fused to the kraft paper layer, and the fused part M
Since the tape is cut by the friction caused by the flat pressure force of the cutter 3-1 while being formed, there is no peeling phenomenon at the edges, and no shearing force is applied during cutting, so the tape is free from wrinkles. Can be constructed.

Figure 3 shows another example of under heater roll 4.
is similar to Fig. 2. However, in this case, the cut parts of the semi-synthetic paper are fused together using sound and light, and F is applied to the same side.
After forming L, the heater plate 3-3 is fused, and the entire fused part M is formed.Continuing with this process, a plate heater 3-3 is used, for example, the same as the cutter 3-1 shown in FIG.
Cut using a piece that does not have 25.

It will be easy to understand that the effect is the same since the fusing and cutting are performed separately as opposed to the simultaneous fusing and cutting shown in Fig. 2.

(Effects of the Invention) According to the present invention, since the cutting line is cut after being fused as described above, there is no peeling of the edges, and since the cutting is performed by friction, the tape structure is cut by shearing force. There is no possibility of generating tape waves due to misalignment.

[Brief explanation of the drawing]

@Figure 1 is a sectional view showing an example of semi-synthetic paper cut according to the present invention, Figure 2 is a front view of an example of the present invention, and Figure 3 is a fusion process in another example of the present invention. Front view showing a family meeting, No. 4
The figure is a front view of a conventional cutting method, and FIG. 5 is a front view of a step of fusing the edges of semi-synthetic paper cut by a conventional method. . 1...Kraft paper 2...Polypropylene paper L...
・Semi-synthetic paper 3... Heat cutter 3-1... Cutter 3-2... Plate heater M... Fusion part
4... Under heater roll 5... Core shaft 6...
・Spring 3-3...Heater Shirol agent Patent attorney Mamoru Takeen

Claims (1)

[Claims] A method for cutting semi-synthetic paper, which comprises heating and melting the semi-synthetic paper consisting of a kraft paper layer and a plastic sheet layer along a cutting line and cutting the kraft paper layer and plastic sheet layer by pressing friction.