JPH09119025A - Cutting of continuous fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cut a long fiber, while preventing short cut fibers from clogging, by providing a difference in peripheral velocity between a cutter roller and a rubber roller, subjected to revolution. SOLUTION: This method provides a difference in peripheral velocity between a cutter roller 11 and a rubber roller 13, subjected to revolution when a continuous fiber such as glass fiber is delivered between the cutter roller 11 having cutter blades 12 radially on its circumference and the rubber roller 13 standing against the cutter roller and cut by revolutions of the cutter roller 11 and the rubber roller 13. In this method, it is preferable to revolve both rollers in the directions opposite to each other while providing a difference in peripheral velocity between both rollers by maintaining the peripheral velocity of the cutter roller 11 at 310m/min and that of the rubber roller at 300m/min.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method for cutting long fibers such as glass fibers into a certain length.

[0002]

2. Description of the Related Art For example, in the case of glass fiber, molten glass is drawn out from a large number of nozzle holes, spun into continuous fine filaments, coated with a sizing agent, and several hundreds
Thousands are bundled to form a strand, which is wound with a winder to form a roving roll called a cake. Then, after this, by going through a twisting process into a yarn or through a compounding process into roving, other than when it is used as long fibers, it is cut into short fibers of a certain length through a chopping process. It is sometimes used as a chopped strand as a reinforcing material for resins and cement.

In the chopping step, as shown in FIG. 3, a strand S is formed by using a device provided with a cutter roller 2 having a cutter blade 1 radially on its outer peripheral surface and a rubber roller 3 facing the cutter roller 2. Is disconnected. The cutter roller 2 and the rubber roller 3 are arranged at an interval such that the tip of the cutter blade 1 of the cutter roller 2 slightly presses the rubber roller 2 when the strand S is cut, and either the cutter roller 2 or the rubber roller 3 is disposed. Is rotated by a motor (not shown) and the other is followed and rotated, whereby both rollers 2 and 3 are rotated in the opposite directions at the same peripheral speed. Using such a device, the rotating cutter roller 2 and rubber roller 3
The strand S is sent between the two, and the strand S is cut into a length corresponding to the distance between the cutter blades 1 to form a chopped strand C.

[0004]

However, in the conventional cutting method, the chopped strands that have been cut may not be discharged from between the cutter blades of the cutter roller, and in particular, the interval between the cutter blades is shortened in order to shorten the cutting length. The narrower the chop, the less chopped strands are discharged and the more likely it is to clog between the cutter blades. If chopped strands are clogged between the cutter blades, poor cutting will occur easily.If the chopping strands continue to be cut, the chopped strands will accumulate between the cutter blades, and if the cutting blades reach the tip of the cutter blades, the cutting work will become impossible. cause. Further, if the chopped strands are clogged between the cutter blades, performing unreasonable cutting work not only shortens the life of the cutter blades but also causes unevenness on the outer peripheral surface of the rubber roller. There is a problem that the parts of the above must be replaced in a short time.

Therefore, an object of the present invention is to provide a cutting method capable of preventing chopped short fibers from being clogged between the cutter blades of a cutter roller and satisfactorily cutting long fibers. is there.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems and objects, and has a long length between a cutter roller radially having a cutter blade on its outer peripheral surface and a rubber roller opposed to the cutter roller. A method of cutting long fibers by feeding fibers and rotating the cutter roller and rubber roller, in the method for cutting long fibers, characterized in that both the cutter roller and the rubber roller are rotationally driven and a peripheral speed difference is provided between them. It is a method of cutting long fibers.

[0007]

According to the present invention, both the cutter roller and the rubber roller are forcibly driven and rotated with a peripheral speed difference therebetween, whereby each cutter blade of the cutter roller is used when not cutting long fibers. , When standing upright from the outer peripheral surface of the cutter roller and cutting long fibers, that is, when the cutter blade bites into the long fiber and its cutting edge slightly presses against the rubber roller, It shows a state that it curled from the part toward the cutting edge part,
When the blade edge of the cutter blade comes off the rubber roller, the reaction force causes the cutter blade to bounce, thereby discharging short fibers.

[0008]

EXAMPLES The cutting method of the present invention will be described below based on examples.

FIG. 1 is a schematic plan view of a cutting device for carrying out the cutting method of the present invention.

11 is a cutter roller having a cutter blade 12 radially on its outer peripheral surface, and 13 is the cutter roller 11
A rubber roller 14 is a roller for driving the cutter roller, and a rubber roller 15 is a motor for driving the rubber roller.

Pulleys 16 and 16 are attached to the shaft portion 11 'of the cutter roller 11 and the rotating shaft 14' of the motor 14 for driving the cutter roller. The rotation driving of the roller driving motor 14 is transmitted to the cutter roller 11.

The cutter blades 12 are made of metal and are provided on the outer surface of the cutter roller 11 in large numbers at regular intervals.

The rubber roller 13 is made of urethane rubber,
The pulley 16 and 16 and the belt 17 are also interposed between the shaft portion 13 ′ of the rubber roller 13 and the rotation shaft 15 ′ of the rubber roller driving motor 15 so that the rotational driving of the rubber roller driving motor 15 is transmitted to the rubber roller 13. There is.

The cutter roller 11 and the rubber roller 13 are
The blade edges of the cutter blades 12 are arranged at intervals such that they slightly contact the rubber roller 13.

A case where glass fiber strands are cut by such a cutting device will be described.

Both the cutter roller 11 and the rubber roller 13 are forcibly driven by the cutter roller driving motor 14 and the rubber roller driving motor 15, so that the peripheral speed of the cutter roller 11 is 310 m / min, and the peripheral speed of the rubber roller 13 is 3 m / min.
The rotation speed is set to 00 m / min, and the two are rotated in opposite directions with a peripheral speed difference therebetween. When the strand S is supplied between the cutter roller 11 and the rubber roller 13 in this state, the strand S is cut while the blade tip of the cutter blade 12 slightly contacts the rubber roller 13 as shown in FIG. 2, and becomes a chopped strand C. . Each cutter blade 12 of the cutter roller 11 is upright from the outer peripheral surface of the cutter roller 11 when the strand S is not cut, but when the strand S is cut, that is, the cutter blade 12 bites into the strand S. In the state where the cutting edge is slightly pressed against the rubber roller 13, the cutter roller 1 is used in this embodiment.
Since the peripheral speed of 1 is faster than the peripheral speed of the rubber roller 13, the root portion 12a of the cutter blade 12 moves faster than the blade tip portion 12b, and the cutter blade 12 moves from the root portion 12a to the blade tip portion 1a.
It exhibits a state in which it curves back toward 2b, which is opposite to the direction of rotation. When the blade edge of the cutter blade 12 is disengaged from the rubber roller 13, the blade tip portion 12b of the cutter blade 12 instantly rebounds from the state indicated by the alternate long and short dash line in FIG. 2, whereby the chopped strand C is extruded and discharged. It

Regarding the rotation of the cutter roller 11 and the rubber roller 13, the peripheral speed of the cutter roller 11 is preferably 1 to 8% of the peripheral speed of the rubber roller 13, and more preferably 3.
Spin to ~ 6% faster. If it is less than 1%, the peripheral speed difference between the cutter roller 11 and the rubber roller 13 is too small, so that the cutter blade 12 hardly warps, and the blade tip portion 12b of the blade tip 12b when the blade tip of the cutter blade 12 comes off the rubber roller 13 is small. The bounce is small, and the chopped strand C is not sufficiently extruded. Also, 8%
If it is larger, the peripheral speed of the cutter roller 11 becomes too fast, which may damage the cutter blade 12 or cause a cutting failure.

In the present embodiment, the case where the cutter roller and the rubber roller drive motors are separately provided has been described. However, the peripheral speeds of both rollers can be made different by passing the transmission from one drive motor. You may make it rotate.

[0019]

As described above, according to the present invention,
Since the cut short fibers can be discharged by the rebound of the cutter blade of the cutter roller, it is possible to prevent short fibers from clogging between the cutter blades, and it is possible to perform excellent cutting of long fibers. .

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a cutting device for carrying out a cutting method of the present invention.

FIG. 2 is an enlarged view for explaining the cutting method of the present invention.

FIG. 3 is an explanatory view of a conventional cutting device.

[Explanation of symbols]

 11 Cutter Roller 12 Cutter Blade 12a Root 12b Blade Edge 13 Rubber Roller 14 Cutter Roller Drive Motor 15 Rubber Roller Drive Motor 16 Pulley 17 Belt S Strand C Chopped Strand

Claims (1)

[Claims] 1. Long-fiber cutting, in which long fibers are fed between a cutter roller radially having a cutter blade on an outer peripheral surface thereof and a rubber roller facing the cutter roller, and the long fibers are cut by rotation of the cutter roller and the rubber roller. In the method, both of the cutter roller and the rubber roller are rotationally driven, and a peripheral speed difference is provided between the cutter roller and the rubber roller.