JPH0790498B2 - Sheet resin cutting device - Google Patents

Description

The present invention relates to a cutting device for cutting a resin extruded into a sheet shape in the width direction, and a sheet-shaped resin conveying device combined with the cutting device. In particular, the present invention relates to a sheet-shaped resin cutting device capable of reliably supplying a sheet-shaped resin having high extensibility, adhesiveness, and flexibility to a cutting portion, cutting the sheet-shaped resin in the width direction, and feeding it to the next step. Is.

[Prior Art] When a synthetic resin material having high ductility, adhesiveness and flexibility, such as a thermoplastic polyester resin, is extruded into a sheet shape, a sheet-shaped extruded material continuous in the longitudinal direction is provided downstream of the extruded material. In many cases, the cutting process is immediately performed on the side in the width direction and the longitudinal direction. For example, FIG. 2 illustrates a cutting device used in such a case, and a sheet-shaped resin material (hereinafter simply referred to as resin material 2) that is drawn out at a high speed through between two endless belts 5a and 5b. In some cases) 2 is cut in the width direction by a cutting device provided between the endless belts 5a and 5b.

This cutting device sandwiches the sheet-shaped resin material 25 between two flat plate-shaped fixed blades 13a and 13b, and cuts the sheet-shaped resin material 2 in the width direction by the shearing force of the fixed blades 13a and 13b.
However, in the case of a sheet-shaped resin that is formed into a sheet after polymerization and remains sticky even after cooling, the resin adheres to the cutting edges of the fixed blades 13a and 13b or stretches in this cutting step. In the case of a highly flexible resin, the portion sandwiched between the fixed blades 13a and 13b may stretch and may not be cut completely. Therefore, as a method of cutting such a sheet-shaped resin material in the width direction,
The sheet-shaped resin material was once wound up together with the release film, and the sheet-shaped resin material was manually cut by sandwiching. Further, it is often experienced that the sheet-shaped resin material 2 adheres to the outer surface of the endless belt 5 and the sheet-shaped resin material 2 is not smoothly fed.

Therefore, in recent years, a so-called water jet knife device has been used, which sprays ultra-high pressure water from a nozzle onto a sheet-shaped resin to cut the resin.

[Problems to be Solved by the Invention] However, when a sheet-shaped resin material having high adhesiveness, ductility and flexibility is cut by using the above-described method using ultra-high pressure water, it is possible to obtain a fixed blade or the like. Although the resin adherence is prevented as much as possible, since high pressure fluid is used, sufficient safety measures must be taken, not only the cost of the entire equipment including safety measures becomes expensive, but also high speed If the nozzle portion is moved at a high speed corresponding to the traveling sheet-shaped resin material, the jetting water pressure may be lowered and the cutting ability may be lowered.

On the other hand, up to now, no device has been proposed in which special measures have been taken against the adhesion of the sheet-shaped resin to the outer surface of the endless belt.

The present invention has been made in consideration of the above circumstances, by reliably feeding the sheet-shaped resin to the cutting portion even if the sheet-shaped resin is soft, easy to adhere, or even has a property of being easily stretched. An object of the present invention is to provide a sheet-shaped resin cutting device capable of cutting and also cutting sheet-shaped resin that is extruded at high speed.

[Means for Solving the Problems] The present invention sandwiches a continuously running sheet-shaped resin at two points in the running direction, and conveys the sheet-shaped resin while applying tension to the sheet-shaped resin. And a cutting section disposed in the vicinity of the sheet-shaped resin between the first conveyance section and the second conveyance section. Each of the conveyance sections has a coil-shaped spring in a sheet shape along the sheet-shaped resin traveling direction. It is composed of a pair of endless belts arranged on the resin sandwiching surface, and the cutting part has a rotary shaft inclined with respect to the running direction of the sheet-shaped resin, a rotary blade provided on the rotary shaft, and a sheet-shaped belt. A sheet-shaped resin cutting device, comprising: a support body that moves a rotary blade so as to obliquely move with respect to a width-direction cutting line of the sheet-shaped resin while the resin is running.

That is, according to the present invention, a plurality of coil-shaped springs are arranged on the surface to prevent adhesion, and the feeding speed of the second transfer section is made faster than that of the first transfer section to apply tension to the sheet-shaped resin. It is characterized in that a pair of endless belts and a rotary blade that moves at a high speed while being inclined with respect to the width direction of the sheet-shaped resin are combined.

[Operation] According to the present invention, for example, the extrusion-molded sheet-shaped resin is sent to the second transport unit through the first transport unit, and the feeding speed of the second transport unit is higher than that of the first transport unit. Since it is also fast, it moves in a state in which tension is applied between the two transport units. In this state, if the support holding the rotating blade rotating at a high speed moves obliquely to the widthwise shear line of the sheet-shaped resin, the sheet-shaped resin will not adhere to the rotating blade. The sheet-shaped resin that is reliably cut and that is sandwiched between the respective conveying units is easily separated from the conveying unit by the restoring force of the coil-shaped spring and is sent to the next step.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, a method of cutting a polyester resin (Vylon resin: trade name manufactured by Toyobo Co., Ltd.), which has been polymerized and then extruded (casting) into a sheet shape, in the width direction will be described as an example.

FIG. 1 is a perspective view of an essential part illustrating a cutting device according to the present invention, in which a sheet-shaped resin material 2 travels between two transfer devices 1, 1 as a first transfer part and a second transfer part. When the traveling speeds Va and Vb of the endless belts 5a and 5b are set so that the resin material does not sag in the cutting portion 3, Va ≦ Vb is set.

A drive source 8 is provided on the solid base 15, and the drive source 8
Applies rotational force to the support 7 and the rotary blade 6 separately via the transmission 9. The disk-shaped support 7 is rotated substantially coaxially with the axis of the transmission 9, and its rotation surface is arranged so as to be oblique to the widthwise cutting line of the sheet-shaped resin material 2. The support 7 does not directly contact the resin material 2. A disc-shaped rotary blade 6 which rotates at a high speed by a belt 12 is arranged at one position on the peripheral edge of the support 7. The rotary blade 6 may be disk-shaped as in the embodiment of FIG. 1 or may be a star-shaped or square rotary blade.

The sheet-shaped resin material 2 is cut by rotating the support 7 in the direction of arrow A and moving the rotary blade 6 that rotates at high speed in the width direction of the sheet-shaped resin material 2. At this time, the sheet-shaped resin material 2 is running at a constant speed in the arrow B direction.
In this example, the turning direction of the support 7 is inclined with respect to the widthwise cutting line of the sheet-shaped resin material 2 for the following reason. That is, when cutting a running sheet,
For example, as shown in FIG. 3, when the sheet-shaped resin material 2 is traveling in the direction of the arrow and is attempted to be cut in the width direction along the one-dot chain 11B from the cutting start point 10, the sheet-shaped resin material 2 continuously runs. As a result, the cut ends up distorting diagonally. Therefore, in order to cut the sheet-shaped resin material 2 right in the width direction, it is necessary to incline the cutting direction in accordance with the traveling speed of the sheet-shaped resin material 2 and cut along the one-dot chain line 11B direction.

The sheet-shaped resin material 2 is conveyed by the sheet-shaped resin material 2.
A pair of endless belts that travel with the sheet sandwiched therebetween are used, but in order to reliably travel the highly adhesive resin material 2, it is necessary to devise so that the sheet resin material 2 does not adhere to the outer surface of the belt. . As a means therefor, as shown in FIG. 4, it is advantageous to adopt a method of reducing the contact surface between the outer surface of the belt and the sheet-shaped resin material 2. That is, in the configuration shown in FIG. 4, a plurality of coil-shaped springs 14 (three in the figure) are arranged on the outer surface of the endless belt 5, and they are opposed to each other.
The sheet-shaped resin material 2 is held between the two springs 14 and 14 to continuously advance the resin material 2.

The cutting unit 3 and the transport unit 1 described above are rotated or operated by a drive system schematically shown in FIG. In this embodiment, 1
Rotation of the rotary blade 6 and driving of the endless belt 5 are simultaneously performed by the one drive source 8. FIG. 6 is a partially cutaway front view showing a state in which the device of the present invention is incorporated on a movable mount.

A cutting experiment of a sheet-like thermoplastic polyester resin having a width of 400 mm and a thickness of 4 mm was conducted by using the cutting device shown in FIG. The speed of the endless belt 5a in the transport section 1 is 20.
The speed of the endless belt 5b was set to 30 m / min, tension was applied by the speed difference, and a stainless steel spring having a coil diameter of 20 mm was installed on the 6-end endless belt in the conveying section. As a result, the sheet-shaped resin material 2 in which the cut and cut shape of the sheet-shaped resin material 2 is constant can be continuously supplied to the next step.

EFFECTS OF THE INVENTION By using the cutting device of the present invention, it becomes possible to accurately and continuously cut a sheet-shaped resin having particularly high ductility, adhesiveness and flexibility along the width direction. Further, in the cutting device of the present invention, there is no fear that the sheet-shaped resin will adhere to the outer surface of the endless belt and the transportability will be deteriorated, and the high-speed running of the sheet-shaped resin can be sufficiently dealt with. Moreover, the mechanism of the device of the present invention has a simple structure despite having the above advantages, and can be manufactured at a low equipment cost.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a configuration of an embodiment of the present invention, FIG. 2 is an explanatory view showing a conventional cutting device, and FIG. 3 is a cutting line in a width direction of a sheet-shaped resin material according to the embodiment. Explanatory drawing which shows, 4th
FIG. 5 is a perspective view showing a configuration of a transport section according to the embodiment, FIG. 5 is an explanatory view showing a drive system of the embodiment, and FIG. 6 is a front view with a partial cutaway showing an overall view of the apparatus of the present embodiment. is there. 1 ... conveying part, 2 ... sheet-shaped resin material 3 ... cutting part, 4 ... clutch 5,5a, 5b ... endless belt 6 ... rotary blade, 7 ... support 8 ... driving source, 9 , 9a, 9b …… Transmission 10 …… Cutting start point 11A …… Width direction cutting line when resin is stopped 11B …… Width direction cutting line when resin is running 12 …… Belt 14 …… Coil spring 15 …… Fixed Stand 17 ... Stand

Claims (1)

[Claims] 1. A first transport section and a second transport section for sandwiching a continuously running sheet-shaped resin at two locations in the running direction and transporting the sheet-shaped resin while applying tension to the sheet-shaped resin, And a cutting section disposed in the vicinity of the sheet-shaped resin between the transport section and the second transport section, wherein each of the transport sections sandwiches the coil-shaped spring along the sheet-shaped resin traveling direction. It is composed of a pair of endless belts arranged in a plurality of lines on the surface, the cutting portion has a rotary shaft inclinedly arranged with respect to the traveling direction of the sheet-shaped resin, and a rotary blade provided on the rotary shaft, and the sheet. A sheet-shaped resin cutting device, comprising: a support for moving the rotary blade so as to obliquely move with respect to a width-direction cutting line of the sheet-shaped resin during traveling of the sheet-shaped resin.