WO2014132956A1

WO2014132956A1 - Device for producing glass chopped strands, method for maintaining surface of rubber roller, and method for producing glass chopped strands

Info

Publication number: WO2014132956A1
Application number: PCT/JP2014/054482
Authority: WO
Inventors: 泰樹山下; 松原　正典; 敏之青木
Original assignee: 日本電気硝子株式会社
Priority date: 2013-03-01
Filing date: 2014-02-25
Publication date: 2014-09-04
Also published as: JP6200831B2; JP2014193800A; CN105073353B; MY184086A; CN105073353A

Abstract

Provided is a device for producing glass chopped strands that enables a cutter roller to continuously cut a glass strand by grinding the roughened surface of a rubber roller by just the right amount and maintaining the rubber roller in a uniform smooth state, even in cases where the diameter of the rubber roller has been reduced by the abutment of the cutter roller. This device (100) for producing glass chopped strands comprises: a rubber roller (11); a cutter roller (10) that abuts against the surface of the rubber roller (11) and cuts a glass strand (F) while rotating; and a grinding means (12) that grinds the surface of the rubber roller (11) while moving back and forth in the width direction of the rubber roller (11), and that comes closer to the rubber roller (11) as the diameter of the rubber roller (11) decreases. The state of the grinding means (12) with respect to the rubber roller (11) is made variable such that the grinding amount of the rubber roller (11) per unit time is increased as the diameter of the rubber roller (11) decreases.

Description

Glass chopped strand manufacturing apparatus, rubber roll surface maintaining method, and glass chopped strand manufacturing method

The present invention relates to a glass chopped strand manufacturing apparatus including a rubber roll and a cutter roll, a surface maintaining method for the rubber roll, and a method for manufacturing a glass chopped strand.

Glass chopped strands are produced by cutting glass fiber strands (hereinafter simply referred to as glass strands) formed from hundreds to thousands of glass monofilaments into a certain length. The step of cutting the glass strand is performed by rotating the glass strand supplied from the upstream while the cutter roll is brought into contact with the surface of the rubber roll while the glass strand is placed on the surface of the rubber roll. On the surface of the cutter roll, cutting blades are attached radially at equal intervals around the rotation axis. When the glass strand is fed between the cutter roll and the rubber roll, the glass strand is cut into short fibers having a certain length by the cutter roll to generate a glass chopped strand.

¡Since the surface of the rubber roll is directly hit by the cutting blade of the cutter roll, the surface of the rubber roll gradually becomes rough with scratches. If the cutting process of the glass strand is continued while the surface of the rubber roll is rough, the glass strand sinks into the scratch on the surface of the rubber roll and the cutting blade does not sufficiently hit, so there is a possibility that the glass strand cannot be completely cut. . Therefore, in the past, attempts have been made to restore the surface of the rubber roll to a smooth state by devising to keep the surface of the rubber roll as long as possible, or by polishing the surface of the rough rubber roll.

For example, the long fiber cutting device of Patent Document 1 includes a polishing unit that polishes the surface of the rubber roll while reciprocating at a constant speed in the width direction of the rubber roll, and is roughened by the polishing unit while operating the long fiber cutting device. The surface of the rubber roll is smoothed.

The cutter apparatus of patent document 2 adjusts the space | interval in the circumferential direction of the cutting blade of a cutter roll, and the thickness of a cutting blade to the predetermined range, and the blade shape of the cutter roll formed in the surface of a rubber roll is a cutting blade. The progress of deterioration of the surface of the rubber roll is suppressed so as to coincide with the pitch of the rubber roll.

JP 7-41333 A JP 2000-301487 A

During the production of glass chopped strands, the rubber roll is scraped by the cutting blade of the cutter roll, so that the diameter of the rubber roll gradually decreases. On the other hand, the peripheral speed of the rubber roll is set to a constant speed in order to keep the fiber length of the glass chopped strands constant. Therefore, when the diameter of the rubber roll decreases, the number of rotations of the rubber roll increases, and accordingly, the number of contact between the rubber roll and the cutting blade increases. As a result, the deterioration rate of the surface of the rubber roll increases rapidly as the diameter of the rubber roll decreases.

As described above, the long fiber cutting device of Patent Document 1 includes a polishing means for polishing the surface of the rubber roll, but the deterioration rate of the surface of the rubber roll is not constant and increases with a decrease in the diameter of the rubber roll. Here, when the polishing speed of the polishing means (the speed of the polishing means moving in the width direction of the rubber roll) is matched with the deterioration rate of the rubber roll when the diameter of the rubber roll is reduced (when the polishing speed is set high), the surface of the rubber roll May be excessively shaved to shorten the life of the rubber roll. In addition, when the polishing speed of the polishing means is matched to the deterioration speed of the rubber roll immediately after the start of production of the glass chopped strand (when the polishing speed is set slower), the surface of the rubber roll can be sufficiently polished as the diameter of the rubber roll decreases. Disappear. In this case, since it is necessary to remove and regenerate the rubber roll, the production efficiency of the glass chopped strands may be reduced.

In the cutter device of Patent Document 2, the progress of deterioration of the surface of the rubber roll is suppressed by adjusting the interval in the circumferential direction of the cutting blade and the thickness of the cutting blade. However, it is difficult to perfectly match the blade shape of the cutter roll and the pitch of the cutting blades only by adjusting the interval and thickness of the cutting blades, and deviation occurs between the two over time. As a result, a saw blade shape is formed on the surface of the rubber roll, which may shorten the life of the rubber roll.

The present invention has been made in view of the above problems, and even in a situation where the diameter of the rubber roll has decreased due to the contact of the cutter roll, the rough surface of the rubber roll is polished and maintained in a certain smooth state. An object of the present invention is to provide a glass chopped strand manufacturing apparatus capable of continuously cutting glass strands with a cutter roll and extending the life of a rubber roll. Moreover, this invention provides the surface maintenance method of the rubber roll used for the manufacturing apparatus of the said glass chopped strand, Furthermore, it aims at providing the manufacturing method of glass chopped strand.

The characteristic configuration of the glass chopped strand manufacturing apparatus according to the present invention for solving the above problems is as follows.
A rubber roll for conveying the glass strand supplied from the upstream to the downstream;
A cutter roll that cuts the glass strand while rotating in contact with the surface of the rubber roll;
Polishing while reciprocating the surface of the rubber roll in the width direction of the rubber roll, and a polishing means close to the rubber roll according to a decrease in the diameter of the rubber roll;
An apparatus for producing glass chopped strands comprising:
The state of the polishing means with respect to the rubber roll can be changed so that the polishing amount of the rubber roll per unit time increases in accordance with the decrease in the diameter of the rubber roll.

The apparatus for manufacturing glass chopped strands of this configuration can change the state of the polishing means for the rubber roll so that the amount of polishing of the rubber roll per unit time increases as the diameter of the rubber roll decreases. As a result, the glass strand is always properly ground, and as a result, the glass strand can be continuously cut by the cutter roll. Then, by using a rubber roll whose surface is appropriately polished, it becomes difficult for cutting defects of the glass strand to occur, and it can contribute to improving the quality of the glass chopped strand. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means with respect to the rubber roll can be changed so that the amount of decrease in the diameter of the rubber roll per unit time increases.

The glass chopped strand manufacturing apparatus of this configuration can maintain the amount of polishing on the surface of the rubber roll appropriately because the state of the polishing means for the rubber roll can be changed so that the amount of decrease in the diameter of the rubber roll per unit time increases. can do. Thereby, the surface of the rubber roll is maintained in a smooth state during the cutting of the glass strand, and as a result, the cutting failure of the glass strand hardly occurs, which can contribute to the quality improvement of the glass chopped strand. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means with respect to the rubber roll can be changed so that the rate of increase in the polishing amount of the rubber roll increases as the diameter of the rubber roll decreases.

The glass chopped strand manufacturing apparatus of this configuration can polish the surface of the rubber roll because the state of the polishing means for the rubber roll can be changed so that the increase rate of the polishing amount of the rubber roll increases as the diameter of the rubber roll decreases. The amount can be maintained appropriately. Thereby, the surface of the rubber roll is maintained in a smooth state during the cutting of the glass strand, and as a result, the cutting failure of the glass strand hardly occurs, which can contribute to the quality improvement of the glass chopped strand. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means is set so that the average reciprocating speed of the polishing means increases as the diameter of the rubber roll decreases.

The apparatus for producing glass chopped strands of this configuration is such that the state of the polishing means is set so that the average reciprocating speed of the polishing means increases as the diameter of the rubber roll decreases. The amount of polishing of the surface of the rubber roll of the polishing means can be increased in accordance with the increase in the deterioration rate of. As a result, even when the diameter of the rubber roll is reduced due to the contact of the cutter roll, the rough surface of the rubber roll is polished and maintained in a constant smooth state, and the glass strand is continuously cut by the cutter roll. It becomes possible. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means is set so that the increasing rate of the average reciprocating speed decreases as the diameter of the rubber roll decreases.

The glass chopped strand manufacturing apparatus of the present configuration is set by the polishing means so that the increase rate of the average reciprocating speed decreases as the diameter of the rubber roll decreases. The polishing amount of the surface of the rubber roll of the polishing means can be increased in accordance with the increase in the deterioration rate of the rubber roll. As a result, even when the diameter of the rubber roll has decreased due to contact with the cutter roll, the rough surface of the rubber roll is polished without excess or deficiency to maintain a constant smooth state, and the glass strand is continuously cut by the cutter roll. Can be performed automatically.

In the apparatus for producing glass chopped strand according to the present invention,
The polishing means is close to the rubber roll when the moving direction is changed in a reciprocating movement, and the moving distance of the polishing means to be close to the rubber roll increases as the diameter of the rubber roll decreases. Is preferably set.

In the glass chopped strand manufacturing apparatus of this configuration, the polishing means moves closer to the rubber roll when the moving direction changes in the reciprocating movement, and the proximity movement distance in which the polishing means approaches the rubber roll increases as the diameter of the rubber roll decreases. Thus, since the state of the polishing means is set, the polishing means can increase the pressing force to the rubber roll in accordance with the increase in the deterioration rate of the rubber roll due to the decrease in the diameter of the rubber roll. The amount of surface polishing can be increased. Accordingly, insufficient polishing or excessive polishing of the surface of the rubber roll immediately after the start of production of the glass chopped strands can be suppressed.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means is set so that the reciprocating movement of the polishing means is temporarily stopped in accordance with a decrease in the diameter of the rubber roll.

In the glass chopped strand manufacturing apparatus of this configuration, since the state of the polishing unit is set so as to temporarily stop the reciprocating movement of the polishing unit according to the decrease in the diameter of the rubber roll, the polishing unit is turned on / off. The polishing amount of the rubber roll can be easily adjusted only by operation. In addition, it becomes easy to remove the polishing means at the time of stop and perform maintenance or replacement.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means is set so that the reciprocating movement of the polishing means is partially decelerated in accordance with a decrease in the diameter of the rubber roll.

The apparatus for manufacturing glass chopped strands with this configuration is configured to reduce the amount of rubber roll polishing easily because the state of the polishing means is set so as to partially decelerate the reciprocation of the polishing means as the diameter of the rubber roll decreases. It is possible to adjust to a smoother state.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that a constant speed movement period in which the polishing means reciprocates at a constant speed and a stop period in which the polishing means stops temporarily are provided.

The glass chopped strand manufacturing apparatus of this configuration is provided with a constant speed movement period in which the polishing means reciprocates at a constant speed and a stop period in which the polishing means temporarily stops, so that the operation control of the polishing means is easily performed. be able to. In addition, it becomes easy to remove the polishing means and perform maintenance or replacement during the stop period.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that the state of the polishing means can be changed when the moving direction changes in the reciprocating movement of the polishing means.

The glass chopped strand manufacturing apparatus of this configuration can change the state of the polishing means when the moving direction changes in the reciprocating movement of the polishing means, so that the variation in the diameter in the width direction of the rubber roll is reduced, and the surface of the rubber roll is It is maintained in a smooth state. As a result, it becomes difficult for cutting defects of the glass strand to occur, and this can contribute to improving the quality of the glass chopped strand.

In the apparatus for producing glass chopped strand according to the present invention,
It is preferable that a mixing prevention means for preventing the rubber scraps from being mixed into the manufactured glass chopped strand is provided.

Since the glass chopped strand manufacturing apparatus of this configuration includes the above-described mixing prevention means, it is possible to prevent the polishing scraps generated when the rubber roll is polished from being mixed into the manufactured glass chopped strand. As a result, the quality of the product using the glass chopped strand can be maintained well.

The characteristic configuration of the method for maintaining the surface of a rubber roll according to the present invention for solving the above problems is as follows.
A conveying step of conveying the glass strand supplied from the upstream downstream by a rubber roll;
A cutting step of cutting the glass strand while rotating the cutter roll in a state where the cutter roll is brought into contact with the surface of the rubber roll,
A polishing step of reciprocating a polishing means in the width direction of the rubber roll to polish the surface of the rubber roll;
A method for maintaining the surface of a rubber roll used for the production of a glass chopped strand comprising:
In the polishing step, the state of the polishing means with respect to the rubber roll is changed so that the polishing amount of the rubber roll per unit time increases as the diameter of the rubber roll decreases.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, the surface of the rubber roll is always properly polished, and as a result, the glass strand can be continuously cut by the cutter roll. And, by using a rubber roll with a properly polished surface, it becomes difficult for cutting defects of the glass strand to occur, and furthermore, the rotation of a rubber roll with a properly polished surface is stable, improving the quality of the glass chopped strand Can also contribute. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, the state of the polishing means is preferably set so that the amount of decrease in the diameter of the rubber roll per unit time increases.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, the polishing amount on the surface of the rubber roll can be appropriately maintained. Thereby, the surface of the rubber roll is maintained in a smooth state during the cutting of the glass strand, and as a result, the cutting failure of the glass strand hardly occurs, which can contribute to the quality improvement of the glass chopped strand. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that the state of the polishing means is set so that the rate of increase in the polishing amount of the rubber roll increases as the diameter of the rubber roll decreases.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that the state of the polishing unit is set so that the average reciprocating speed of the polishing unit increases with a decrease in the diameter of the rubber roll.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, even when the diameter of the rubber roll is reduced due to the contact of the cutter roll, the rough surface of the rubber roll is polished and maintained in a constant smooth state, and the glass strand is continuously cut by the cutter roll. Is possible. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that the state of the polishing means is set so that the rate of increase in the average reciprocating speed decreases as the diameter of the rubber roll decreases.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. In other words, even when the diameter of the rubber roll has decreased due to contact with the cutter roll, the rough surface of the rubber roll is polished without excess or deficiency to maintain a constant smooth state, and the glass strand is continuously cut by the cutter roll. Can be performed.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, the reciprocating movement of the polishing means is close to the rubber roll when the moving direction is changed, and the proximity movement distance in which the polishing means is close to the rubber roll increases as the diameter of the rubber roll decreases. The state of the polishing means is preferably set.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, the polishing means can increase the pressing force on the rubber roll in accordance with the increase in the deterioration rate of the rubber roll due to the decrease in the diameter of the rubber roll, and as a result, the polishing amount of the surface of the rubber roll can be increased. Accordingly, insufficient polishing or excessive polishing of the surface of the rubber roll immediately after the start of production of the glass chopped strands can be suppressed.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that the state of the polishing unit is set so that the reciprocation of the polishing unit is temporarily stopped in accordance with a decrease in the diameter of the rubber roll.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, the polishing amount of the rubber roll can be easily adjusted only by turning on / off the polishing means. In addition, it becomes easy to remove the polishing means at the time of stop and perform maintenance or replacement.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that the state of the polishing unit is set so that the reciprocation of the polishing unit is partially decelerated in accordance with a decrease in the diameter of the rubber roll.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, the polishing amount of the rubber roll can be easily adjusted and can be maintained in a smoother state.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that a constant speed movement period in which the polishing means reciprocates at a constant speed and a stop period in which the polishing means stops temporarily are provided.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, it is possible to easily control the operation of the polishing means. In addition, it becomes easy to remove the polishing means and perform maintenance or replacement during the stop period.

In the method for maintaining the surface of the rubber roll according to the present invention,
In the polishing step, it is preferable that the state of the polishing means is changed when the moving direction changes in the reciprocating movement of the polishing means.

The method for maintaining the surface of the rubber roll having this configuration can provide the same excellent effects as those of the glass chopped strand manufacturing apparatus described above. That is, the variation in diameter in the width direction of the rubber roll is reduced, and the surface of the rubber roll is maintained in a smooth state. As a result, it becomes difficult for cutting defects of the glass strand to occur, and this can contribute to improving the quality of the glass chopped strand.

In the method for maintaining the surface of the rubber roll according to the present invention,
It is preferable to execute a regeneration step of removing the rubber roll at a predetermined frequency and regenerating the surface of the rubber roll.

In the method for maintaining the surface of the rubber roll of this configuration, the surface of the rubber roll is further smoothed by removing the rubber roll at a predetermined frequency and regenerating the surface of the rubber roll, thereby further extending the life of the rubber roll.

The characteristic composition of the manufacturing method of the glass chopped strand concerning the present invention for solving the above-mentioned subject,
A conveying step of conveying the glass strand supplied from the upstream downstream by a rubber roll;
A cutting step of cutting the glass strand while rotating the cutter roll in a state where the cutter roll is brought into contact with the surface of the rubber roll,
A method for producing glass chopped strands comprising:
During execution of the cutting step, the polishing means is reciprocated in the width direction of the rubber roll to perform a polishing step of polishing the surface of the rubber roll, and in the polishing step, a unit according to a decrease in the diameter of the rubber roll The state of the polishing means with respect to the rubber roll is changed so that the polishing amount of the rubber roll per hour increases.

The manufacturing method of the glass chopped strand having this configuration can exhibit the same excellent operational effects as the above-described glass chopped strand manufacturing apparatus. That is, the surface of the rubber roll is always properly polished, and as a result, the glass strand can be continuously cut by the cutter roll. And, by using a rubber roll with a properly polished surface, it becomes difficult for cutting defects of the glass strand to occur, and furthermore, the rotation of a rubber roll with a properly polished surface is stable, improving the quality of the glass chopped strand Can also contribute. Moreover, since the excessive grinding | polishing of the surface of the rubber roll immediately after manufacture start of a glass chopped strand can be suppressed, the lifetime of a rubber roll can be extended.

FIG. 1 is a schematic front view of a glass chopped strand manufacturing apparatus. FIG. 2 is a schematic plan view of a glass chopped strand manufacturing apparatus. FIG. 3 is a schematic front view of a glass chopped strand manufacturing apparatus provided with mixing prevention means. FIG. 4 is a graph showing the relationship between the decrease in the diameter of the rubber roll used in the glass chopped strand manufacturing apparatus and the reciprocating time of the polishing means. FIG. 5 is a graph showing the relationship between the diameter of the rubber roll and the elapsed time of the polishing operation during the rubber roll polishing process. FIG. 6 is a graph showing the relationship between the polishing amount of the rubber roll and the elapsed time of the polishing work during the polishing process of the rubber roll.

Hereinafter, an embodiment relating to a glass chopped strand manufacturing apparatus, a rubber roll surface maintaining method, and a glass chopped strand manufacturing method of the present invention will be described with reference to FIGS. However, the present invention is not intended to be limited to the configurations described in the embodiments and drawings described below.

<Glass chopped strand manufacturing equipment>
FIG. 1 is a schematic front view of a glass chopped strand manufacturing apparatus 100. FIG. 2 is a schematic plan view of the glass chopped strand manufacturing apparatus 100. The glass chopped strand manufacturing apparatus 100 is an apparatus for manufacturing the glass chopped strand S by cutting the glass strand F into a predetermined length as shown in FIGS. 1 and 2, and the cutting blade 10a in the circumferential direction. The cutter roll 10 mounted at equal intervals and radially with respect to the rotation axis, the rubber roll 11 with the elastic body 11c around the roller core 11d, and the surface 11a of the rubber roll 11 are polished and maintained in a certain smooth state. And a polishing means 12 for carrying out the above. 1 indicate the rotation direction of the cutter roll 10 and the rubber roll 11, and the black arrow illustrated in FIGS. 1 and 2 indicates the moving direction of the cutter roll 10 and the polishing means 12.

The rubber roll 11 is pivotally supported so as to be rotatable around the shaft center 11 b and is driven to rotate at a constant peripheral speed by the first motor 13. The size of the rubber roll 11 can be changed according to the type of the glass chopped strand S to be manufactured, the manufacturing scale, and the like. For example, the diameter of the rubber roll 11 (including the elastic body 11c) is 250 to 400 mm, and the width direction of the rubber roll 11 The length is set to 250 to 450 mm, and the thickness of the elastic body 11c is set to 5 to 100 mm. The material used for the elastic body 11c can be appropriately selected according to the properties of the glass strand F to be cut, but a rubber material having appropriate elasticity and resistance to deterioration is preferable. For example, urethane rubber, fluorine Examples thereof include rubber, silicone rubber, chloroprene rubber, acrylic rubber, isoprene rubber, nitrile rubber, styrene rubber, hyperon rubber, and natural rubber. The rubber roll 11 configured as described above conveys 1 to 100 glass strands F supplied from the upstream to the downstream while being placed on the surface 11a.

The cutter roll 10 is attached so that the cutting blades 10a protrude radially from the axial center 10b at equal intervals (for example, 3 mm) in the circumferential direction. The shaft center 10 b of the cutter roll 10 is disposed so as to be substantially parallel to the shaft center 11 b of the rubber roll 11, and is disposed so that the cutting blade 10 a of the cutter roll 10 can come into contact with the surface 11 a of the rubber roll 11. The cutter roll 10 is rotatably supported around an axis 10b, and is driven to rotate by the second motor 14 according to the peripheral speed of the rubber roll 11, and rotates while contacting the surface 11a of the rubber roll 11. The strand F is cut. At this time, the peripheral speed of the cutter roll 10 is set in consideration of the generation amount of the glass chopped strand S so that the cut glass chopped strand S is not clogged between the cutting blades 10 a of the cutter roll 10. The size of the cutter roll 10 can be changed according to the type and production scale of the glass chopped strand S to be produced. For example, the diameter of the cutter roll 10 (including the cutting blade 10a) is set to 50 to 100 mm, The length in the width direction of the cutter roll 10 is set equal to or slightly longer than the length in the width direction of the rubber roll 11. As a result, the cutting edge of the cutting blade 10 a of the cutter roll 10 can be reliably brought into contact with the entire width direction of the rubber roll 11.

The cutter roll 10 presses the cutting blade 10a against the surface 11a of the rubber roll 11 with a predetermined pressure in order to give a shearing force to the glass strand F. By this pressing, the cutting blade 10a of the cutter roll 10 bites into the surface 11a of the rubber roll 11, and the surface 11a of the rubber roll 11 is shaved. As a result, the diameter of the rubber roll 11 gradually decreases, and the pressing force of the cutter roll 10 on the surface 11a of the rubber roll 11 is weakened. Therefore, the cutter roll 10 is connected to a slide means 20 for approaching the rubber roll 11 in accordance with the deterioration of the rubber roll 11. As shown in FIG. 2, the slide means 20 includes a first base 21 on which a second motor 14 that rotates the cutter roll 10 is placed, and a first drive means 22 that moves the first base 21. . The first base 21 is slidably disposed on a first rail 23 that is disposed in a direction orthogonal to the axis 10b of the cutter roll 10 (the direction of the arrow a).

The shaft center 10b of the cutter roll 10 and the shaft center 11b of the rubber roll 11 are arranged so as to be substantially parallel, and when the first drive means 22 is driven, the first base 21 moves over the first rail 23 with an arrow. Slide and move in the direction of a. A second motor 14 is placed on the first base 21, and the second motor 14 is connected to the cutter roll 10. For this reason, when the 1st base 21 slides, the cutter roll 10 moves to the direction of arrow a, ie, the direction which presses the surface 11a of the rubber roll 11. FIG. Thereby, the cutter roll 10 can press the cutting blade 10a against the surface 11a of the rubber roll 11 while maintaining the parallel state of the axis 10b of the cutter roll 10 and the axis 11b of the rubber roll 11. For example, a stepping motor capable of causing the cutter roll 10 to approach the rubber roll 11 at regular intervals can be used as the first driving means 22. In this embodiment, the cutter roll 10 is driven by the second motor 14 and is configured to rotate independently of the rubber roll 11. However, the cutter roll 10 is rotated by the rotation of the rubber roll 11. It may be configured. In this case, the number of parts of the glass chopped strand manufacturing apparatus 100 can be reduced.

Since the surface 11a of the rubber roll 11 is gradually scraped by the pressing and rotation of the cutting blade 10a, the smoothness of the surface 11a of the rubber roll 11 decreases with time. The polishing means 12 maintains the surface 11a of the rough rubber roll 11 in a smooth state by polishing the surface 11a of the rubber roll 11. As shown in FIGS. 1 and 2, the polishing unit 12 includes a polishing unit 15 that polishes the surface 11 a of the rubber roll 11, and a proximity moving unit that moves the polishing unit 15 so as to be close to the axis 11 b of the rubber roll 11. 30 and a width direction moving means 40 for reciprocating the polishing portion 15 in parallel with the width direction of the rubber roll 11. The polishing unit 15 abuts on the surface 11a of the rubber roll 11 by the proximity moving means 30, and polishes the surface 11a of the rubber roll 11 by reciprocating in the width direction of the rubber roll 11 by the width direction moving means 40. In this invention, it is comprised so that the state of the grinding | polishing means 12 with respect to the rubber roll 11 can be changed so that the grinding | polishing amount of the rubber roll 11 per unit time may increase according to the reduction | decrease of the diameter of the rubber roll 11. FIG. Here, the state of the polishing unit 12 includes, for example, the posture (polishing angle) of the polishing unit 15 with respect to the rubber roll 11, the moving direction of the polishing unit 15, the reciprocating speed of the polishing unit 15, the proximity moving distance, and the polishing unit 15. It means a movement pattern. The state change of the polishing means 12 will be described later.

As shown in FIGS. 1 and 2, the width direction moving unit 40 is parallel to the width direction of the rubber roll 11 and the second base 41 on which the polishing unit 15 for polishing the surface 11 a of the rubber roll 11 is placed. A second rail 42 disposed on the rail, a rail base 43 for fixing the second rail 42, and a second drive means 44 for moving the second base 41. For example, a DC motor or a servo motor that can change the slide speed of the second base 41 can be used as the second drive unit 44. The polishing portion 15 is fixed to the second base 41 so as to face the surface 11 a of the rubber roll 11. When receiving the driving force from the second driving means 44, the second base 41 slides on the second rail 42 (in the direction of arrow c). As a result, the polishing unit 15 disposed on the second base 41 reciprocates in the direction of the arrow c, and uniformly polishes the surface 11a of the rubber roll 11. It is preferable that the reciprocating speed of the polishing unit 15, which is one of the states of the polishing unit 12, is set so as to increase as the diameter of the rubber roll 11 decreases. The deterioration rate of the rubber roll 11 increases as the diameter of the rubber roll 11 decreases. Therefore, if the reciprocating speed of the polishing portion 15 is increased in accordance with the decrease in the diameter of the rubber roll 11 and the polishing amount per unit time on the surface of the rubber roll is increased, the diameter of the rubber roll 11 is increased by the contact of the cutter roll 10. Even in a situation where the reduction has progressed, the rough surface of the rubber roll 11 is polished and maintained in a certain smooth state, and the glass strand F can be continuously cut by the cutter roll 10. Moreover, by using the rubber roll 11 whose surface is appropriately polished, it becomes difficult for cutting defects of the glass strand F to occur, and it can contribute to improving the quality of the glass chopped strands. Furthermore, since excessive polishing of the surface of the rubber roll 11 can be suppressed, the life of the rubber roll 11 can be extended. The reciprocating speed of the polishing unit 15 is preferably increased when the reciprocating direction of the polishing unit 15 changes. In this case, since the entire polishing amount of the rubber roll 11 can be equalized, the variation in the diameter in the width direction of the rubber roll 11 is reduced, and the surface of the rubber roll 11 is maintained in a smooth state. As a result, it becomes difficult for cutting defects of the glass strand F to occur.

The reciprocating speed of the polishing unit 15 described above refers to an “average reciprocating speed” including a stop period, a deceleration period, and the like, as will be described later. Specifically, the distance that the polishing unit 15 reciprocates can be handled as being divided by the time from the start of the reciprocation to the start of the next reciprocation. Therefore, as long as the set average reciprocating speed is maintained, during the polishing of the rubber roll 11, as the state of the polishing means 12 is changed, the reciprocating movement of the polishing unit 15 is temporarily performed according to the decrease in the diameter of the rubber roll 11. The reciprocating speed of the polishing unit 15 can be partially reduced. Since the temporary stop of the reciprocating movement of the polishing unit 15 can be performed only by the on / off operation of the switch, the polishing amount of the rubber roll 11 can be easily adjusted. In addition, it becomes easy to remove the polishing means at the time of stop and perform maintenance or replacement. If the reciprocating speed of the polishing unit 15 is partially reduced, the polishing amount of the rubber roll 11 can be easily adjusted, and a smoother state can be maintained. In the present invention, it is preferable to provide a constant speed movement period in which the polishing unit 15 reciprocates at a constant speed and a stop period in which the polishing section 15 temporarily stops. In this case, it is possible to easily control the operation of the polishing unit 15, and it is also easy to remove the polishing unit 15 and perform maintenance or replacement during the stop period.

As shown in FIGS. 1 and 2, the proximity moving means 30 includes third driving means 31 that moves the rail base 43. For example, a stepping motor that can move the rail base 43 when the reciprocating direction of the polishing unit 15 changes can be used as the third driving unit 31. When receiving the driving force from the third driving means 31, the rail base 43 slides on the third rail 32 arranged in a direction orthogonal to the axis 11 b of the rubber roll 11 (direction of arrow b). That is, the polishing unit 15 placed on the second base 41 moves in the direction of the arrow b, that is, the direction in which the surface 11a of the rubber roll 11 is pressed. Thereby, the polishing unit 15 can press the surface 11a of the rubber roll 11 with a predetermined pressing force, and is polished by the pressing force. The distance that the polishing unit 15, which is one of the states of the polishing means 12, moves in the direction of pressing the surface 11 a of the rubber roll 11, that is, the distance that moves (proximity movement) in the direction approaching the axis 11 b of the rubber roll 11 (proximity movement distance). ) Is preferably set so as to increase as the diameter of the rubber roll 11 decreases. In this case, since the pressing force of the polishing unit 15 increases as the diameter of the rubber roll 11 decreases, the amount of polishing of the surface of the rubber roll 11 can be increased as the diameter of the rubber roll 11 decreases. As a result, insufficient polishing or excessive polishing of the surface of the rubber roll 11 immediately after the start of production of the glass chopped strands can be suppressed. In addition, when the proximity movement distance of the polishing unit 15 is intermittently increased when the reciprocating direction of the polishing unit 15 changes, the entire polishing amount of the rubber roll 11 can be equalized, and the variation in the diameter of the rubber roll 11 in the width direction is small. Thus, the surface of the rubber roll 11 is maintained in a smooth state. As a result, it becomes difficult for the defective cutting of the glass strand F to occur.

The polishing unit 15 may be any member that can uniformly polish the surface 11a of the rubber roll 11, and includes, for example, a horusoe, a bite blade, a rotating grindstone, an end mill, etc. Among them, the horusoe is preferably used.

In the glass chopped strand manufacturing apparatus 100, it is preferable to provide a control means (not shown) for controlling the operations of the slide means 20, the proximity moving means 30, and the width direction moving means 40. A general-purpose personal computer or the like can be used as the control means. If the control means is used, the state of the polishing means 12 with respect to the rubber roll 11 described above (the attitude of the polishing unit 15 with respect to the rubber roll 11 (polishing angle), the moving direction of the polishing unit 15, the reciprocating speed of the polishing unit 15, the proximity moving distance, and The movement pattern of the polishing unit 15 and the like can be easily changed. Further, by inputting a preset program into the control means and operating the slide means 20, the proximity moving means 30, and the width direction moving means 40 in a predetermined pattern, a rubber roll by the glass chopped strand manufacturing apparatus 100 described later is used. Eleven surface maintenance methods can be performed automatically.

FIG. 3 is a schematic front view of the glass chopped strand manufacturing apparatus 100 provided with mixing prevention means. When the surface 11 a of the rubber roll 11 is polished by the polishing means 12, polishing scraps W of the elastic body 11 c are generated and fall below the rubber roll 11. The glass chopped strand S cut by the cutter roll 10 falls between the rubber roll 11 and the cutter roll 10. Here, if the falling position of the polishing waste W and the falling position of the glass chopped strand S are close to each other, the polishing waste W may be mixed into the glass chopped strand S. Therefore, in order to avoid the mixing of the polishing waste W into the glass chopped strand S, it is effective to provide a mixing prevention means for preventing the polishing waste W from mixing into the glass chopped strand S below the rubber roll 11. The mixing prevention means is configured as a baffle plate 16 as shown in FIG. 3, for example. In this case, since the polishing waste W does not scatter over the baffle plate 16, mixing of the polishing waste W into the glass chopped strand S can be prevented. As a result, the quality of the product using the glass chopped strand can be maintained well. In addition to the baffle plate 16, for example, it is also effective to provide suction means (not shown) for sucking the polishing waste W below the rubber roll 11 as the mixing prevention means. In this case, since the polishing waste W can be sucked by the suction means, when used together with the baffle plate 16, mixing of the polishing waste W into the glass chopped strand S can be more reliably prevented.

<Rubber roll surface maintaining method and glass chopped strand manufacturing method>
Next, a method for maintaining the surface of the rubber roll 11 in the glass chopped strand manufacturing apparatus 100 and a method for manufacturing a glass chopped strand that is executed simultaneously with the surface maintaining method will be described. In the method for maintaining the surface of the rubber roll 11 and the method for producing glass chopped strands of the present invention, the polishing means 12 for the rubber roll 11 is increased so that the polishing amount of the rubber roll 11 per unit time increases as the diameter of the rubber roll 11 decreases. Change the state of. The state of the polishing means 12 is the same as that described in “Glass chopped strand manufacturing apparatus”. When the glass chopped strand is manufactured by the glass chopped strand manufacturing apparatus 100, the glass strand F is unraveled from a plurality of cakes installed on a cake stand (not shown), and the glass strand F in a state of being separated one by one is the cutter roll 10 And the rubber roll 11. The rubber roll 11 conveys the glass strand F downstream by rotation of the rubber roll 11 while placing the supplied plurality of glass strands F on the surface 11a of the rubber roll 11 (conveying step). The cutter roll 10 is rotated by pressing the cutting blade 10a against the surface 11a of the rubber roll 11 with a predetermined pressure, so that the cutter roll 10 is made of glass by the cutting blade 10a arranged on the surface of the cutter roll 10 at equal intervals (for example, 3 mm). The strand F is cut into glass chopped strands S (for example, 3 mm) having a certain length (cutting step).

The cutter roll 10 is moved by the sliding means 20 in a direction approaching the axis 11b of the rubber roll 11 (in the direction of arrow a) according to the deterioration of the surface 11a of the rubber roll 11, and a cutting blade is applied to the surface 11a of the rubber roll 11 10a is pressed with a predetermined pressure. The movement of the cutter roll 10 in the direction of arrow a is interlocked with the movement (direction of arrow b) of the polishing means 12 to be described later in the direction closer to the axis 11b of the rubber roll 11, and the cutter roll 10 moves in a predetermined direction. It can be set to move by distance.

The polishing means 12 is reciprocated in the width direction of the rubber roll 11 (the direction of the arrow c) while being in contact with the rubber roll 11 by the width direction moving means 40, and the polishing portion 15 uniformly polishes the entire surface 11a of the rubber roll 11. And smoothing (polishing step). The polishing means 12 is moved in the arrow b direction by the proximity moving means 30 according to the deterioration of the surface 11 a of the rubber roll 11, and the polishing portion 15 is brought into contact with the surface 11 a of the rubber roll 11. The movement of the polishing means 12 in the direction of arrow b can be set so that the polishing means 12 moves a predetermined distance each time the surface 11a of the rubber roll 11 is reciprocated once. The movement of the polishing means 12 in the arrow direction b occurs, for example, every time the width direction moving means 40 is provided with a pulse signal generator (not shown) and the polishing means 12 moves back and forth on the surface 11a of the rubber roll 11 once. It is executed when a pulse signal is detected. In this embodiment, the cutter roll 10 and the polishing means 12 move in the direction of approaching the axis 11b of the rubber roll 11 each time the polishing means 12 moves back and forth on the surface 11a of the rubber roll 11. However, each time the polishing means 12 reciprocates according to a certain rule (for example, every time it reciprocates twice), the polishing means 12 may be set so as to move in the direction closer to the axis 11b of the rubber roll 11. Alternatively, it may be set so as to move in the direction approaching the axis 11b of the rubber roll 11 in accordance with the elapsed time from the start of cutting of the glass strand F. Furthermore, it is also effective to increase the proximity movement distance in which the polishing means 12 approaches the direction of the axis 11b of the rubber roll 11 when the movement direction changes in the reciprocating movement of the polishing means 12 in accordance with the decrease in the diameter of the rubber roll 11 due to polishing. It is. In this case, the polishing means 12 can increase the pressing force to the rubber roll 11 in accordance with the increase in the deterioration rate of the rubber roll 11 due to the decrease in the diameter of the rubber roll 11, and as a result, the amount of polishing of the surface of the rubber roll 11 is increased. Can be made. Therefore, insufficient polishing or excessive polishing of the surface of the rubber roll 11 immediately after the start of production of the glass chopped strands can be suppressed. When it is necessary to flatten the rough surface 11a of the rubber roll 11 to a level equivalent to that of a new product, the rubber roll 11 is removed from the glass chopped strand manufacturing apparatus 100, and the surface 11a of the rubber roll 11 is regenerated by performing more precise polishing. (Regeneration process). Thereby, the lifetime of the rubber roll 11 can be extended.

By the way, in maintaining the surface 11a of the rubber roll 11 of the glass chopped strand manufacturing apparatus 100, in this embodiment, the polishing means 12 is reciprocated in the direction of the arrow c in a state of being pressed against the surface 11a of the rubber roll 11, The surface 11a of the rubber roll 11 is uniformly polished and maintained in a smooth state. At this time, the surface 11a of the rubber roll 11 is gradually scraped by the polishing means 12, and the diameter of the rubber roll 11 is reduced. When trying to keep the peripheral speed constant with the rubber roll 11 having a reduced diameter, the number of rotations of the rubber roll 11 increases, so the number of contact between the surface 11a of the rubber roll 11 and the cutter roll 10 increases, and the rubber roll 11 deteriorates. Speed will increase. Therefore, in the present invention, the reciprocating speed of the polishing means 12 is set so as to increase as the diameter of the rubber roll 11 decreases. That is, the polishing amount per unit time of the rubber roll 11 is set to increase in accordance with the decrease in the diameter of the rubber roll 11. Here, the reciprocating speed of the polishing means 12 can be handled as the average reciprocating speed as in the above description. Thereby, even in a situation where the diameter of the rubber roll 11 is decreasing, the rough surface 11a of the rubber roll 11 is polished and maintained in a certain smooth state, and the glass strand F is continuously cut by the cutter roll 10. Is possible. Moreover, since the frequency of regeneration of the rubber roll 11 by manual work can be reduced, the life of the rubber roll 11 can be extended. The timing for changing the reciprocating speed of the polishing means 12 may be the time when the polishing means 12 reciprocates once on the surface 11a of the rubber roll 11, or the polishing means 12 reciprocates once on the surface 11a of the rubber roll 11. You may be on the way. In the former case, the change in the reciprocating speed of the polishing means 12 is stepwise, and in the latter case, the change in the reciprocating speed of the polishing means 12 is continuous.

The increase rate of the reciprocating speed of the polishing means 12 is preferably set so as to decrease as the diameter of the rubber roll 11 decreases. As described above, when the diameter of the rubber roll 11 decreases, the number of rotations of the rubber roll 11 increases. Accordingly, the number of contact between the surface 11a of the rubber roll 11 and the cutter roll 10 increases, and the deterioration rate of the rubber roll 11 increases. To increase. At this time, if the increase rate of the reciprocating speed of the polishing means 12 is increased to a constant value, the cutter roll 10 will excessively polish the surface 11a of the rubber roll 11 as the diameter of the rubber roll 11 decreases, and the rubber roll 11 Will shorten the lifespan. This is because when the diameter of the rubber roll 11 decreases, the surface area of the surface 11 a of the rubber roll 11 decreases, and the ratio of the surface area of the rubber roll 11 polished by one reciprocating movement of the polishing means 12 to the total surface area of the rubber roll 11 increases. Because. Therefore, in the present invention, the rate of increase in the reciprocating speed of the polishing means 12 is set to decrease as the diameter of the rubber roll 11 decreases. Thereby, the rough surface 11a of the rubber roll 11 can be polished without excess or deficiency and maintained in a certain smooth state. As a result, the frequency of manual regeneration of the rubber roll 11 can be further reduced, and the life of the rubber roll 11 can be further extended. As a setting example for reducing the increase rate of the reciprocating speed of the polishing means 12 as the diameter of the rubber roll 11 decreases, for example, when the diameter of the rubber roll 11 is 370 mm, the diameter of the rubber roll 11 is a certain amount (for example, 20 mm). There is a method of setting so that the rate of increase in the reciprocating speed of the polishing means 12 decreases each time it decreases.

The increasing rate of the reciprocating speed of the polishing means 12 is constant from the start of use of the rubber roll 11 until the diameter of the rubber roll 11 decreases to a predetermined diameter, and gradually decreases after the diameter of the rubber roll 11 reaches the predetermined diameter. May be set. Specifically, for example, when the diameter of the rubber roll 11 is 370 mm, the increase rate of the reciprocating speed of the polishing means 12 is constant in the section of the diameter of 370 mm to 340 mm, and the section of the diameter of 340 mm to 280 mm is set to the rubber roll 11. It is conceivable that the rate of increase in the reciprocating speed of the polishing means 12 is gradually reduced every time the diameter of the polishing member decreases by 10 mm. As a result, the rough surface 11a of the rubber roll 11 can be further polished and maintained in a certain smooth state. As a result, it is possible to further efficiently reduce the frequency of manually regenerating the rubber roll 11 and further extend the life of the rubber roll 11.

In order to continuously cut the glass strands F by the cutter roll 10 for a long period of time while maintaining the surface of the rubber roll 11 in a certain smooth state, the frequency of the regeneration work performed by removing the rubber roll 11 is reduced, and the rubber roll It is necessary to extend the life of 11. Then, about the state change of the grinding | polishing means 12 implemented when grind | polishing the surface of the rubber roll 11, the test for confirming the lifetime and reproduction | regeneration frequency of the rubber roll 11 is performed using the glass chopped strand manufacturing apparatus 100 of this invention. It was. The contents of the confirmation test will be described below.

<Test method>
The glass chopped strand manufacturing apparatus (Example) in which the reciprocating speed of the polishing means is increased in accordance with the decrease in the diameter of the rubber roll, and the polishing means so that a smooth surface can be obtained even if the diameter of the rubber roll is reduced. Using a glass chopped strand manufacturing apparatus (comparative example) with a constant reciprocating speed, each rubber roll was polished. FIG. 4 is a graph showing the relationship between the decrease in the diameter of the rubber roll used in the glass chopped strand manufacturing apparatus and the reciprocating time of the polishing means. The vertical axis of the graph indicates the time (minutes) for the polishing means to reciprocate in the width direction of the rubber roll. That is, the shorter the time required for the polishing means to reciprocate, the faster the reciprocating speed. The horizontal axis of the graph indicates the diameter (mm) of the rubber roll. The white marker in the graph is an example in which the reciprocating speed of the polishing means is increased in accordance with the decrease in the diameter of the rubber roll. In the examples, as will be described later, the time for the polishing means to reciprocate in the width direction of the rubber roll was set to be shortened step by step from 38 minutes to 6 minutes. The black marker is a comparative example in which the reciprocating time of the polishing means is fixed at 8 minutes and the reciprocating speed of the polishing means is constant.

The diameter of the rubber roll used in Examples and Comparative Examples is 370 mm, the thickness of the elastic body is 100 mm, and the width of the rubber roll is 350 mm. Urethane rubber was used for the elastic body of the rubber roll. A horusoe was used as a polishing part, and the surface of the rubber roll was polished in the width direction of the rubber roll. The movement of the horusoe and the cutter roll in the axial direction of the rubber roll was set so as to move by 0.1 mm in the axial direction of the rubber roll every time the horusoe reciprocated once. The diameter of the rubber roll was set so as to decrease by 0.2 mm (sum of moving distances of the horusoe and the cutter roll) every time the horusoe reciprocates once. In the embodiment, the reciprocating speed of the polishing means was set so as to increase in accordance with the decrease in the diameter of the rubber roll, and the increasing rate of the reciprocating speed of the polishing means was set to decrease stepwise as described above. . Specifically, the diameter of the rubber roll is a first section of 370 mm to 350 mm, a second section of 350 mm to 330 mm, a third section of 330 mm to 310 mm, a fourth section of 310 mm to 290 mm, and a fifth section of 290 mm to 285 mm, respectively. In this section, the rate of increase was constant, and the rate of increase in the reciprocating speed of the horusoe was set to gradually decrease as the section progressed to a new rubber roll diameter section. The rate of increase in the reciprocating speed in each rubber roll diameter section is 72.7% in the first section, 69.2% in the second section, 44.4% in the third section, and 28.6 in the fourth section. %, And the fifth section was set to 16.7%. The increase rate of the reciprocating speed in the rubber roll diameter section will be described by taking the first section as an example. In the first section, the time required for the reciprocating movement of the horusoe is set to 38 minutes when the diameter of the rubber roll is the initial 370 mm, and the time required for the reciprocating movement of the horusoe is set to 22 minutes when the diameter of the rubber roll is 350 mm at the end. It is set. Here, since the reciprocating speed of the Horso is proportional to the reciprocal of the time required for the reciprocating movement, the increasing rate of the reciprocating speed of the Horso in the first section is (1 / 22-1 / 38) ÷ 1/38 × 100 = 72.7 (%). In the comparative example, since the time required for the reciprocating movement of the Horso is set to a fixed time of 8 minutes, the increase rate of the reciprocating speed of the Horso is 0%.

<Test results>
FIG. 5 is a graph showing the relationship between the diameter of the rubber roll and the elapsed time of the polishing operation during the rubber roll polishing process. FIG. 6 is a graph showing the relationship between the polishing amount of the rubber roll and the elapsed time of the polishing work during the polishing process of the rubber roll.

Considering the life of the rubber roll, for example, when the rubber roll is used up to about 77% (diameter 285 mm) when not used (diameter 370 mm), from FIG. It took about 1390 hours to reach the required diameter of 285 mm. In contrast, in the glass chopped strand manufacturing apparatus of the comparative example, the diameter of the rubber roll reached 285 mm in about 690 hours, and it was found that the rubber roll needs to be replaced. The reason why the rubber roll of the example achieved a long life is that, as shown in FIG. 6, in the glass chopped strand manufacturing apparatus of the example, the elapsed time of the rubber roll polishing operation (that is, the decrease in the diameter of the rubber roll). This is because the increase rate of the polishing amount of the rubber roll is increased accordingly. As a result, immediately after the start of the production of the glass chopped strand, while suppressing excessive polishing of the surface of the rubber roll, the surface of the rubber roll is reliably polished at a stage where the polishing operation of the rubber roll has passed to some extent, and the glass strand is maintained in a smooth state. It is possible to prevent cutting defects. On the other hand, in the comparative example, since the polishing amount of the rubber roll is constant regardless of the elapsed time of the polishing operation of the rubber roll, the surface of the rubber roll is particularly excessively polished immediately after the start of production of the glass chopped strand. As a result, the life of the rubber roll was shortened. As described above, if the polishing operation of the rubber roll is performed under the conditions of the present invention, the polishing amount of the surface of the rubber roll can be appropriately maintained, so that the life of the rubber roll can be greatly extended compared to the conventional case. It was shown that.

Regarding the regeneration frequency of the rubber roll, when the glass chopped strand production apparatus of the example was used, it was sufficient to regenerate once per day on the average, but when the glass chopped strand production apparatus of the comparative example was used, the average was 1 Regeneration about 3 times a day was necessary. Thus, the Example was able to reduce the reproduction | regeneration frequency of a rubber roll to about 1/3 compared with the comparative example.

From the above results, when the glass chopped strand is manufactured using the glass chopped strand manufacturing apparatus according to the present invention, the cutting of the glass strand by the cutter roll is long while maintaining the surface of the rubber roll in a certain smooth state. It was shown that it will be possible to continue for a period of time.

The glass chopped strand manufacturing apparatus, rubber roll surface maintaining method, and glass chopped strand manufacturing method of the present invention can be used in a manufacturing process of cutting glass strands (glass fibers) into glass chopped strands. It can also be used in applications for cutting other fibers (for example, synthetic fibers, carbon fibers, natural fibers), and further linear objects such as metal wires.

DESCRIPTION OF SYMBOLS 10 Cutter roll 11 Rubber roll 11a Rubber roll surface 12 Polishing means 16 Baffle plate (mixing prevention means)
100 Glass chopped strand manufacturing equipment F Glass strand S Glass chopped strand

Claims

A rubber roll for conveying the glass strand supplied from the upstream to the downstream;
A cutter roll that cuts the glass strand while rotating in contact with the surface of the rubber roll;
Polishing while reciprocating the surface of the rubber roll in the width direction of the rubber roll, and a polishing means close to the rubber roll according to a decrease in the diameter of the rubber roll;
An apparatus for producing glass chopped strands comprising:
An apparatus for producing glass chopped strands, wherein the state of the polishing means relative to the rubber roll is changeable so that the amount of polishing of the rubber roll per unit time increases as the diameter of the rubber roll decreases.
The apparatus for producing a glass chopped strand according to claim 1, wherein the state of the polishing means for the rubber roll is changeable so that the amount of decrease in the diameter of the rubber roll per unit time is increased.
3. The glass chopped strand according to claim 1, wherein the state of the polishing means relative to the rubber roll is changeable so that an increase rate of the polishing amount of the rubber roll increases with a decrease in the diameter of the rubber roll. Manufacturing equipment.
The production of the glass chopped strand according to any one of claims 1 to 3, wherein the state of the polishing means is set so that an average reciprocation speed of the polishing means increases in accordance with a decrease in the diameter of the rubber roll. apparatus.
The apparatus for producing glass chopped strands according to claim 4, wherein the state of the polishing means is set so that the rate of increase in the average reciprocating speed decreases as the diameter of the rubber roll decreases.
The polishing means is close to the rubber roll when the moving direction changes in reciprocating movement, and the proximity moving distance in which the polishing means approaches the rubber roll increases as the diameter of the rubber roll decreases. The glass chopped strand manufacturing apparatus according to any one of claims 1 to 5, wherein the state is set.
The glass chopped strand according to any one of claims 1 to 6, wherein the state of the polishing means is set so as to temporarily stop the reciprocating movement of the polishing means according to a decrease in the diameter of the rubber roll. Manufacturing equipment.
The glass chopped strand according to any one of claims 1 to 6, wherein the state of the polishing means is set so as to partially decelerate the reciprocating movement of the polishing means in accordance with a decrease in the diameter of the rubber roll. Manufacturing equipment.
The glass chopped strand manufacturing apparatus according to claim 4, wherein a constant speed moving period during which the polishing means reciprocates at a constant speed and a stop period during which the polishing means stops temporarily are provided.
The glass chopped strand manufacturing apparatus according to claim 4, wherein the state of the polishing means can be changed when the moving direction changes in the reciprocating movement of the polishing means.
The glass chopped strand production apparatus according to any one of claims 1 to 10, further comprising a mixing prevention means for preventing the rubber roll polishing scraps from being mixed into the manufactured glass chopped strand.
A conveying step of conveying the glass strand supplied from the upstream downstream by a rubber roll;
A cutting step of cutting the glass strand while rotating the cutter roll in a state where the cutter roll is brought into contact with the surface of the rubber roll,
A polishing step of reciprocating a polishing means in the width direction of the rubber roll to polish the surface of the rubber roll;
A method for maintaining the surface of a rubber roll used for the production of a glass chopped strand comprising:
A method of maintaining a surface of a rubber roll, wherein in the polishing step, the state of the polishing means with respect to the rubber roll is changed so that the amount of polishing of the rubber roll per unit time increases as the diameter of the rubber roll decreases.
The method for maintaining a surface of a rubber roll according to claim 12, wherein the state of the polishing means is set so that the amount of decrease in the diameter of the rubber roll per unit time is increased in the polishing step.
The method of maintaining a surface of a rubber roll according to claim 12 or 13, wherein, in the polishing step, the state of the polishing means is set so that the rate of increase in the polishing amount of the rubber roll increases as the diameter of the rubber roll decreases. .
The state of the polishing means is set in the polishing step so that the average reciprocating speed of the polishing means increases with a decrease in the diameter of the rubber roll. Rubber roll surface maintenance method.
The method of maintaining a surface of a rubber roll according to claim 15, wherein, in the polishing step, the state of the polishing means is set so that an increasing rate of the average reciprocating speed decreases as the diameter of the rubber roll decreases.
In the polishing step, the reciprocating movement of the polishing means is close to the rubber roll when the moving direction is changed, and the proximity movement distance in which the polishing means is close to the rubber roll increases as the diameter of the rubber roll decreases. The method for maintaining a surface of a rubber roll according to any one of claims 12 to 16, wherein a state of the polishing means is set.
The state of the polishing means is set in the polishing step so that the reciprocating movement of the polishing means is temporarily stopped according to a decrease in the diameter of the rubber roll. Rubber roll surface maintenance method.
The state of the polishing means is set in the polishing step so that the reciprocation of the polishing means is partially decelerated in accordance with a decrease in the diameter of the rubber roll. Rubber roll surface maintenance method.
The method for maintaining a surface of a rubber roll according to claim 15, wherein in the polishing step, a constant speed movement period in which the polishing means reciprocates at a constant speed and a stop period in which the polishing means stops temporarily are provided.
The method of maintaining a surface of a rubber roll according to claim 15, wherein, in the polishing step, the state of the polishing means is changed when the moving direction changes in the reciprocating movement of the polishing means.
The method for maintaining a surface of a rubber roll according to any one of claims 12 to 21, wherein a regeneration step is performed in which the rubber roll is removed at a predetermined frequency to regenerate the surface of the rubber roll.
A conveying step of conveying the glass strand supplied from the upstream downstream by a rubber roll;
A cutting step of cutting the glass strand while rotating the cutter roll in a state where the cutter roll is brought into contact with the surface of the rubber roll,
A method for producing glass chopped strands comprising:
During execution of the cutting step, the polishing means is reciprocated in the width direction of the rubber roll to perform a polishing step of polishing the surface of the rubber roll, and in the polishing step, a unit according to a decrease in the diameter of the rubber roll A method for producing a glass chopped strand, wherein the state of the polishing means with respect to the rubber roll is changed so that the polishing amount of the rubber roll per hour increases.