WO2014148288A1

WO2014148288A1 - Production device and production method for chopped glass strands

Info

Publication number: WO2014148288A1
Application number: PCT/JP2014/056126
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: 2013-03-19
Filing date: 2014-03-10
Publication date: 2014-09-25
Also published as: MY176311A; JP2014205942A; CN105121718B; CN105121718A; JP6353246B2

Abstract

Provided is a production device for chopped glass strands wherein deep grooves do not easily form in the surface of a rubber-covered roller even when the peripheral speed of a cutter roller is set faster than the peripheral speed of the rubber-covered roller. A production device (100) for chopped glass strands equipped with a rubber-covered roller (11) for conveying downstream glass strands (F) supplied from upstream and a cutter roller (10) for cutting the glass strands (F) while rotating in contact with the surface (11a) of the rubber-covered roller (11), in which the rubber-covered roller (11) and the cutter roller (10) each rotate in a manner such that the slip ratio (S) of the cutter roller (10) to the rubber-covered roller (11) represented by formula (1) constantly varies by positive values. (1) S(%)=(v1/v2-1)×100 (v1: peripheral speed of outer periphery of cutter roller; v2: peripheral speed of outer periphery of rubber-covered roller.)

Description

Glass chopped strand manufacturing apparatus and manufacturing method

The present invention relates to a manufacturing apparatus and a manufacturing method of a glass chopped strand provided with a rubber roll and a cutter roll.

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.

Here, if the glass strand is cut by rotating the cutter roll and the rubber roll at the same peripheral speed, the glass chopped strand may enter between the cutting blades, causing clogging and not being discharged. In particular, when a short glass chopped strand is manufactured, the interval between the cutting blades becomes narrow, and the glass chopped strand easily enters between the cutting blades and easily clogs. If it is attempted to cut the glass strand with a clogged cutting blade, there is a possibility that a defective cutting of the glass strand may occur.

Therefore, in the long fiber cutting method of Patent Document 1, the peripheral speed of the cutter roll is set to be faster than the peripheral speed of the rubber roll, and the glass chopped strand is clogged between the cutting blades of the cutter roll. It is preventing.

Japanese Patent Laid-Open No. 9-119025

In the long fiber cutting method of Patent Document 1, since the peripheral speed of the cutter roll is set faster than the peripheral speed of the rubber roll, when the cutting blade of the cutter roll bites into the surface of the rubber roll, the tip of the cutting blade is the rubber roll. The base part of the cutting blade rotates at the peripheral speed of the cutter roll. As a result, a speed difference is generated between the tip and the base of the cutting blade, and the cutting blade is warped. When the tip of the cutting blade is detached from the surface of the rubber roll from this state and the warping of the cutting blade is eliminated, the cutting blade rebounds in the rotation direction of the cutter roll. In the long fiber cutting method of Patent Document 1, the chopped strands are pushed out from between the cutting blades and discharged using the rebounding force. However, in the long fiber cutting method of Patent Document 1, since the cutter roll is rotated at a constant slip rate with respect to the rubber roll, the cutting blade of the cutter roll easily bites into the same portion of the surface of the rubber roll. As a result, the scratches generated on the surface of the rubber roll gradually increase due to the rebound of the cutting blade, and a new problem arises in that a deep groove is formed to shorten the life of the rubber roll.

The present invention has been made in view of the above problems, and even when the peripheral speed of the cutter roll is set faster than the peripheral speed of the rubber roll, an apparatus for producing a glass chopped strand in which a deep groove is hardly formed on the surface of the rubber roll, and An object is to provide a manufacturing method.

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;
An apparatus for producing glass chopped strands comprising:
The rubber roll and the cutter roll have a slip ratio S of the cutter roll with respect to the rubber roll represented by the following formula (1):
S (%) = (v1 / v2−1) × 100 (1)
v1: Peripheral speed of the outer peripheral surface of the cutter roll v2: The peripheral speed of the outer peripheral surface of the rubber roll is always rotated so as to fluctuate with a positive value.

The glass chopped strand manufacturing apparatus of this configuration is set so that the slip ratio S always fluctuates with a positive value. Therefore, the cutter roll cutting blade is rotated while rotating the cutter roll at a faster peripheral speed than the rubber roll. It can contact | abut in the state shifted with respect to the surface of a rubber roll (The state where the cutting blade of a cutter roll does not bite into the same location on the surface of a rubber roll). As a result, it is possible to prevent the cutting blade of the cutter roll from damaging the same portion of the surface of the rubber roll, and it is possible to prevent deep grooves from being formed on the surface of the rubber roll.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably set so as to vary periodically.

Since the glass chopped strand manufacturing apparatus of this configuration is set so that the slip ratio S varies periodically, the cutting blade of the cutter roll is made of the rubber roll while rotating the cutter roll at a faster peripheral speed than the rubber roll. It can contact | abut on the surface in the state periodically shifted in the rotation front-back direction. As a result, it is possible to reliably prevent deep grooves from being formed on the surface of the rubber roll.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably set so as to vary randomly.

Since the glass chopped strand manufacturing apparatus of this configuration is set so that the slip ratio S fluctuates randomly, the cutting blade of the cutter roll is placed on the surface of the rubber roll while rotating the cutter roll at a faster peripheral speed than the rubber roll. It can be made to contact | abut with the state shifted | deviated to the rotation front-back direction at random. As a result, it is possible to reliably prevent deep grooves from being formed on the surface of the rubber roll.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably set so as to vary within a certain range with a random time period.

Since the glass chopped strand manufacturing apparatus of this configuration is set so that the slip ratio S fluctuates within a certain range in a random time period, the load applied to the cutting blade is reduced, and the cutting blade of the cutter roll Can be brought into contact with the surface of the rubber roll in a state shifted at random in the longitudinal direction of rotation. As a result, it is possible to reliably prevent deep grooves from being formed on the surface of the rubber roll.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably set so as to vary in a random range at a constant time period.

Since the glass chopped strand manufacturing apparatus of this configuration is set so that the slip ratio S fluctuates in a random range at a constant time period, the load applied to the cutting blade is reduced, and the cutting blade of the cutter roll Can be brought into contact with the surface of the rubber roll in a state shifted at random in the longitudinal direction of rotation. As a result, it is possible to reliably prevent deep grooves from being formed on the surface of the rubber roll.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably set so as to vary according to a certain rule.

Since the glass chopped strand manufacturing apparatus of this configuration is set so that the slip ratio S fluctuates according to a certain rule, a deep groove is formed on the surface of the rubber roll while reliably reducing the load on the cutting blade. Can be effectively suppressed.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably set so as to vary within a range of ± 1% from the reference slip ratio S ′.

Since the glass chopped strand manufacturing apparatus of this configuration is set so that the slip rate S varies within a range of ± 1% from the reference slip rate S ′, it effectively reduces the load on the cutting blade. However, it is possible to reliably suppress the formation of deep grooves on the surface of the rubber roll.

In the apparatus for producing glass chopped strand according to the present invention,
The slip ratio S is preferably changed by sequence control.

The glass chopped strand manufacturing apparatus of this configuration can automatically execute the fluctuation operation of the slip ratio S because the slip ratio S varies by sequence control, and as a result, the glass chopped strand manufacturing efficiency is improved. be able to.

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 the execution of the cutting step, the rubber roll and the cutter roll have a slip ratio S of the cutter roll with respect to the rubber roll represented by the following formula (1):
S (%) = (v1 / v2−1) × 100 (1)
v1: Peripheral speed of the outer peripheral surface of the cutter roll v2: The peripheral speed of the outer peripheral surface of the rubber roll is always rotated so as to fluctuate with a positive value.

The glass chopped strand manufacturing method of this configuration is set so that the slip rate S always fluctuates with a positive value in the cutting step, so the cutter roll is rotated while rotating the cutter roll at a faster peripheral speed than the rubber roll. The cutting blade can be brought into contact with the surface of the rubber roll while being shifted. As a result, it is possible to prevent the cutting blade of the cutter roll from damaging the same portion of the surface of the rubber roll, and it is possible to prevent deep grooves from being formed on the surface of the rubber roll.

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 time chart showing the time change of the slip ratio of the cutter roll with respect to the rubber roll. FIG. 4 is a time chart showing the change over time of the slip ratio of the cutter roll with respect to the rubber roll. FIG. 5 is a photograph of (a) the surface of a rubber roll used in a glass chopped strand manufacturing apparatus according to the present invention, and (b) the surface of a rubber roll used in a conventional glass chopped strand manufacturing apparatus. FIG. 6 is a schematic plan view of a glass chopped strand manufacturing apparatus provided with a polishing means.

Hereinafter, an embodiment relating to a glass chopped strand production apparatus of the present invention will be described with reference to FIGS. About the manufacturing method of a glass chopped strand, it demonstrates together in description of a manufacturing apparatus. 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 G 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 is mounted at regular intervals and radially with respect to the rotation axis, and the rubber roll 11 is formed by covering the roller core 11d with an elastic body 11c. A white arrow shown in FIG. 1 indicates the rotation direction of the cutter roll 10 and the rubber roll 11, and a black arrow shown in FIGS. 1 and 2 indicates the moving direction of the cutter roll 10.

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 12. The size of the rubber roll 11 can be changed according to the type of the glass chopped strand G to be manufactured, the manufacturing scale, etc. 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. That is, the conveyance process in the manufacturing method of the glass chopped strand of this invention is performed.

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 13 in accordance with the peripheral speed of the rubber roll 11. The cutter roll 10 is in contact with the surface 11a of the rubber roll 11 while rotating. The strand F is cut. That is, the cutting process in the manufacturing method of the glass chopped strand of this invention is performed. During execution of the cutting process, the peripheral speed of the cutter roll 10 is faster than the peripheral speed of the rubber roll 11, and can be adjusted to vary according to a certain rule or randomly. Although details will be described later, the glass chopped strands G that are cut when the glass strands F are cut by entering the cutter blades 10 and the rubber rolls 11 are appropriately clogged. In addition, the cutting blade 10a is prevented from biting into the same portion of the surface 11a of the rubber roll 11, and the progress of deterioration of the rubber roll 11 is suppressed. The size of the cutter roll 10 can be changed according to the type and production scale of the glass chopped strand G to be manufactured. 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. Thereby, the cutting edge of the cutting blade 10a can be reliably contacted over 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 13 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 13 is placed on the first base 21, and the second motor 13 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 the glass chopped strand manufacturing apparatus 100, it is preferable to provide control means (not shown) for controlling the operation of the first motor 12, the second motor 13, and the slide means 20. By using a preset program, the first motor 12, the second motor 13, and the slide means 20 are sequence-controlled in a predetermined pattern so that the slip rate S of the cutter roll 10 can be changed with respect to the rubber roll 11, which will be described later. Can be executed automatically. A general-purpose personal computer or the like can be used as the control means.

<Slip rate of cutter roll>
On the outer periphery of the cutter roll 10, cutting blades 10 a are provided at equal intervals (for example, 3 mm), and the tips of the cutting blades 10 a come into contact with the surface 11 a of the rubber roll 11. Here, if the peripheral speed of the outer peripheral surface of the cutter roll 10 is set faster (for example, 273 m / min) than the peripheral speed (for example, 260 m / min) of the outer peripheral surface of the rubber roll 11, the rubber roll 11 and the cutter roll 10 The cutting blade 10a is warped at the contact portion. The glass chopped strand G is pushed out from between the cutting blades 10 a of the cutter roll 10 by the rebounding force of the cutting blade 10 a generated when the warping of the cutting blade 10 a is eliminated, and is efficiently discharged from the cutter roll 10. However, when the slip ratio S of the cutter roll 10 with respect to the rubber roll 11 is set to be constant, the frequency at which the cutting blade 10a bites into the same portion of the surface 11a of the rubber roll 11 increases. Thereby, the damage | wound of the surface 11a of the rubber roll 11 may become large gradually, a saw-shaped deep groove | channel may be formed in the surface 11a of the rubber roll 11, and the lifetime of the rubber roll 11 may be shortened. In order to prevent this, the present invention is configured such that the slip ratio S (%) of the cutter roll 10 relative to the rubber roll 11 always varies with a positive value. This variation is performed periodically or randomly. By periodically or randomly changing the slip ratio S, the cutting blade 10a of the cutter roll 10 is brought into contact with the surface 11a of the rubber roll 11 while being shifted in the front-rear direction of rotation, so that the surface 11a of the rubber roll 11 is substantially uniform. So that it can be sharpened. As a result, the formation of serrated deep grooves on the surface 11a of the rubber roll 11 is prevented, and the life of the rubber roll 11 can be extended. The slip ratio S (%) of the cutter roll 10 relative to the rubber roll 11 can be expressed by the following formula (1).
S (%) = (v1 / v2−1) × 100 (1)
v1: Peripheral speed of the outer peripheral surface of the cutter roll 10 v2: Peripheral speed of the outer peripheral surface of the rubber roll 11

The range in which the slip ratio S of the cutter roll 10 with respect to the rubber roll 11 can be taken is 1% to 10%, preferably 2% to 8%, and more preferably 4% to 6%. If the slip rate S of the cutter roll 10 is set to less than 1%, the difference between the peripheral speeds of the cutter roll 10 and the rubber roll 11 is not sufficient, so that the cutting blade 10a pushes out the glass chopped strand G (bounce force) becomes weak. . As a result, the glass chopped strand G may enter between the cutting blades 10a of the cutter roll 10 to cause clogging of the cutter roll 10 and cause a cutting failure of the glass strand F. When the slip rate S of the cutter roll 10 is set to be larger than 10%, when the tip of the cutting blade 10a bites into the surface 11a of the rubber roll 11, a load due to warping of the cutting blade 10a becomes excessive, and the cutting blade 10a may be damaged. There is. A method for changing the slip ratio S of the cutter roll 10 relative to the rubber roll 11 will be described below.

As a method of changing the slip rate S, for example, (1) a range of the slip rate S that is changed up and down by changing the slip rate S up and down in a certain time period from a reference slip rate (reference slip rate) (up and down change) (2) A second variation method in which the slip rate S is varied from the reference slip rate by a certain amount of vertical variation, and the variation time period is randomly changed. And (3) a variation method combining these variation methods. The up / down fluctuation amount and the fluctuation time period of the slip ratio S may be changed or changed randomly, or may be changed or changed according to a certain rule. Note that “up and down fluctuation” means that the slip ratio S fluctuates to a value smaller than the reference slip ratio when it is fluctuated to a value smaller than the reference slip ratio after being varied to a value larger than the reference slip ratio. This includes the case where the value is changed to a value larger than the reference slip rate after the adjustment. The “time period” represents the time required for the slip rate S to be changed up and down from the reference slip rate to return to the reference slip rate.

As the first variation method, for example, the initial slip rate, which is the slip rate S at the start of manufacturing the glass chopped strand G, is set as the reference slip rate S ′, and the slip rate S is determined from the reference slip rate S ′ by a predetermined amount of vertical fluctuation. And fluctuate in a certain time period, and the amount of fluctuation in the vertical direction is varied randomly for each period. In the first variation method, it is difficult to apply an extreme load to the cutting blade 10a of the cutter roll 10, and damage to the cutting blade 10a can be prevented. The reference slip ratio S ′ is set to 4% to 6%, and the vertical fluctuation amount is set to ± 0.4% to ± 2%. Preferably, the reference slip ratio S ′ is set to 4% to 6%, and the vertical fluctuation amount is set to ± 1%. More preferably, the reference slip ratio S ′ is set to 5%, and the vertical fluctuation amount is set to ± 1%.

As the second variation method, for example, the initial slip rate, which is the slip rate S at the start of production of the glass chopped strand G, is set as the reference slip rate S ′, and the slip rate S is constant from the reference slip rate S ′. The time period of the fluctuation is changed at random. To change the time period of fluctuation at random, the time until the slip ratio S fluctuates from the value of the reference slip ratio S ′ by a predetermined amount of vertical fluctuation and returns to the same reference slip ratio S ′ again is changed. That is. The change width of the time period is preferably set to 10 to 30 seconds. If the change width of the time period is set to be shorter than 10 seconds, the slip ratio S is too finely changed, so that the load due to the warp of the cutting blade 10a becomes excessive and the cutting blade 10a may be damaged. If the change width of the time period is set longer than 30 seconds, the variation of the slip ratio S is not sufficient, so that the cutting blade 10a easily bites into the same portion of the surface 11a of the rubber roll 11. As a result, a saw-like deep groove is formed on the surface 11a of the rubber roll 11 due to the rebounding force of the cutting blade 10a, and the life of the rubber roll 11 may be shortened.

Hereinafter, an embodiment in which the slip ratio S of the cutter roll 10 with respect to the rubber roll 11 is varied will be described. 3 and 4 are time charts showing the change over time of the slip ratio S of the cutter roll 10 with respect to the rubber roll 11. 3A is a time chart of the slip ratio S according to the first embodiment, FIG. 3B is a time chart of the slip ratio S according to the second embodiment, and FIG. 3C is according to the third embodiment. FIG. 4D is a time chart of the slip ratio S according to the fourth embodiment, and FIG. 4E is a time chart of the slip ratio S according to the fifth embodiment. In any of the embodiments, the initial slip ratio at the start of manufacturing the glass chopped strand G is set as the reference slip ratio S ′, and the slip ratio S is changed by a predetermined amount of vertical fluctuation from the reference slip ratio S ′. The number shown to the right of the reference slip ratio S ′ on the vertical axis represents the actual value of the reference slip ratio, and the vertical axis represents the amount of variation from the reference slip ratio S ′. As a variation method of the slip ratio S of the cutter roll 10 with respect to the rubber roll 11, the first variation method, the second variation method, and a variation method combining these can be employed. In addition, it is preferable to change the slip ratio S by making the peripheral speed of the outer peripheral surface of the rubber roll 11 constant and changing the peripheral speed of the outer peripheral surface of the cutter roll 10. Since the peripheral speed of the outer peripheral surface of the rubber roll 11 is constant, the supply rate of the glass strand F supplied to the glass chopped strand manufacturing apparatus 100 can be made constant. As a result, the production amount of the glass chopped strand G per unit time Can be made constant.

[First Embodiment]
In the first embodiment shown in FIG. 3A, the slip ratio S is randomly varied using both the first variation method and the second variation method. Each section delimited by a dotted line in the time chart represents one cycle of the fluctuation of the slip ratio S. The reference slip ratio S ′ is set to 6.0%, and the slip ratio S is randomly changed with a vertical fluctuation amount of ± 0.6 to ± 1.0% from the reference slip ratio S ′. The time period of vertical fluctuations is randomly changed between 10 seconds and 14 seconds. In the present embodiment, since both the amount of vertical fluctuation of the slip ratio S and the time period of the fluctuation are randomly varied or changed, the cutting blade 10 a of the cutter roll 10 is rotated in the front-rear direction with respect to the surface 11 a of the rubber roll 11. It can be made to contact in the state shifted at random. As a result, it is possible to reliably prevent deep grooves from being formed on the surface 11a of the rubber roll 11.

[Second Embodiment]
In the second embodiment shown in FIG. 3B, the vertical fluctuation amount of the slip ratio S is set to be constant, and the time period of the fluctuation of the slip ratio S is randomly changed using the second fluctuation method. Each section delimited by a dotted line in the time chart represents one cycle of the fluctuation of the slip ratio S. The reference slip rate S ′ is set to 5.0%, the slip rate S is changed by a vertical fluctuation amount of ± 1.0% from the reference slip rate S ′, and the time period of change of the slip rate S is set to 10 It is changed randomly between 2 and 22 seconds. In this embodiment, since the time period of fluctuation of the slip ratio S is randomly changed, the cutting blade 10a of the cutter roll 10 is in contact with the surface 11a of the rubber roll 11 in a state of being randomly shifted in the front-rear direction. Can be made. As a result, it is possible to reliably prevent deep grooves from being formed on the surface 11a of the rubber roll 11.

[Third Embodiment]
In the third embodiment shown in FIG. 3C, the time period of the variation of the slip ratio S is set to be constant, and the vertical variation amount of the slip ratio S is randomly varied using the first variation method. Each section delimited by a dotted line in the time chart represents one cycle of the variation of the slip ratio S. The reference slip ratio S ′ is set to 4.0%, and the slip ratio S is randomly varied with a vertical fluctuation amount of ± 0.4 to ± 2.0% from the reference slip ratio S ′. The time period of the fluctuation is set to 10 seconds. In the present embodiment, since the vertical fluctuation amount of the slip ratio S is randomly changed, the cutting blade 10a of the cutter roll 10 is brought into contact with the surface 11a of the rubber roll 11 in a state of being randomly shifted in the front-rear direction of rotation. be able to. As a result, it is possible to reliably prevent deep grooves from being formed on the surface 11a of the rubber roll 11.

[Fourth Embodiment]
In the fourth embodiment shown in FIG. 4D, the slip ratio S is varied according to a certain rule using both the first variation method and the second variation method. Each section delimited by a dotted line in the time chart represents one cycle of the variation of the slip ratio S. The reference slip rate S ′ is set to 5.0%, the slip rate S is changed by an amount of vertical fluctuation of ± 0.6 to ± 1.0% from the reference slip rate S ′, and the slip rate S is changed. Is changed between 10 seconds and 14 seconds. Further, three cycles of the variation of the slip ratio S are set as one cycle, and this cycle is repeated so that the slip ratio S varies according to a certain rule. In the present embodiment, both the vertical fluctuation amount of the slip rate S and the time period of the fluctuation are changed or changed according to a certain rule, so that the cutting blade 10a of the cutter roll 10 is rotated before and after the surface 11a of the rubber roll 11 is rotated. It is possible to make contact with the direction shifted in a predetermined pattern. As a result, it is possible to reliably prevent a deep groove from being formed on the surface 11a of the rubber roll 11 while reliably reducing the load applied to the cutting blade 10a due to the change in the slip ratio S. In the present embodiment, both the vertical fluctuation amount of the slip ratio S and the time period of the fluctuation are changed or changed. However, as in the second embodiment and the third embodiment described above, either one is made constant. The other may be set to vary or change.

[Fifth Embodiment]
In the fifth embodiment shown in FIG. 4 (e), the slip ratio S is varied by setting the vertical variation amount of the slip ratio S and the time period of the variation constant. Each section delimited by a dotted line in the time chart represents one cycle of the variation of the slip ratio S. The reference slip rate S ′ is set to 5.0%, the slip rate S is changed by ± 1.5% up / down fluctuation amount from the reference slip rate S ′, and the time period of change of the slip rate S is 20 Set to seconds. In this embodiment, since the up-and-down fluctuation amount of the slip rate S and the time period of the fluctuation are set to be constant, the load applied to the cutting blade 10a of the cutter roll 10 can be reliably reduced.

An apparatus for manufacturing glass chopped strands (Example) in which the slip rate of the cutter roll relative to the rubber roll according to the present invention was varied, and an apparatus for manufacturing glass chopped strands (Comparative Example) in which the slip rate of the cutter roll relative to the rubber roll was constant. Used, and the deterioration test of the surface of the rubber roll was carried out. The used rubber roll has a diameter of 370 mm, a length in the width direction of 350 mm, and an elastic body thickness of 100 mm. Urethane rubber was used for the elastic body of the rubber roll. The peripheral speed of the rubber roll was set to 260 m / min. In the embodiment, as shown in FIG. 3 (b), the reference slip ratio is set to 5.0%, the slip ratio is changed by a vertical fluctuation amount of ± 1.0% from the reference slip ratio, and the slip The time period of fluctuation of the rate S was randomly changed between 10 seconds and 30 seconds. In the comparative example, the slip ratio was set to 5%. The apparatus for producing glass chopped strands of Examples and Comparative Examples was operated for 30 hours, and the deterioration state of the surface of the rubber roll was visually evaluated.

FIG. 5 shows (a) the surface of a rubber roll used in a glass chopped strand production apparatus according to the present invention (Example), and (b) the surface of a rubber roll used in a conventional glass chopped strand production apparatus (Comparative Example). It is a photograph of. As shown in FIG. 5 (a), the surface of the rubber roll of the example is scraped substantially evenly in the front-rear direction and maintains a smooth state. On the other hand, as shown in FIG. 5 (b), the surface of the rubber roll of the comparative example has a saw-like deep groove, and it can be confirmed that the deterioration is progressing. In addition, clogging of the glass chopped strand into the cutting blade of the cutter roll did not occur in any of the examples and the comparative examples.

[Another embodiment]
FIG. 6 is a schematic plan view of a glass chopped strand manufacturing apparatus 100 provided with a polishing means 14, which is another embodiment of the glass chopped strand manufacturing apparatus according to the present invention. The black arrows shown in FIG. 6 indicate the moving directions of the cutter roll 10 and the polishing means 14. In the above embodiment, the slip rate S of the cutter roll 10 with respect to the rubber roll 11 is changed, and the cutting blade 10a of the cutter roll 10 is brought into contact with the surface 11a of the rubber roll 11 in a state shifted in the front-rear direction. Although the formation of deep grooves on the surface 11a of the rubber roll 11 is suppressed, polishing is performed to polish the surface 11a of the rubber roll 11 while reciprocating in the width direction of the rubber roll 11 in order to smooth the surface 11a of the rubber roll 11. It is also possible to provide further means 14.

As shown in FIG. 6, the polishing unit 14 includes a polishing unit 15 that polishes the surface 11 a of the rubber roll 11, a proximity moving unit 30 that moves the polishing unit 15 so as to be close to the axis 11 b of the rubber roll 11, A width direction moving means 40 for reciprocating the polishing portion 15 in parallel with the width direction of the rubber roll 11 is provided. 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.

As shown in FIG. 6, the width direction moving means 40 is disposed in a direction parallel to the second base 41 on which the polishing portion 15 for polishing the surface 11 a of the rubber roll 11 is placed and the width direction of the rubber roll 11. The second rail 42, the rail base 43 that fixes the second rail 42, and the second driving means 44 that moves the second base 41 are provided. 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.

The proximity moving means 30 includes third driving means 31 for moving the rail base 43, as shown in FIG. 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. Thus, the polishing unit 15 can press the surface 11a of the rubber roll 11 with a predetermined pressure.

By providing such a polishing means 14, the surface 11 a of the rubber roll 11 is actively smoothed, so that formation of deep grooves on the surface 11 a of the rubber roll 11 is further suppressed. The polishing unit 15 constituting the polishing unit 14 may be any as long as the surface 11a of the rubber roll 11 can be uniformly polished. For example, a horusoe, a bite blade, a rotating grindstone, an end mill and the like can be mentioned. Among them, a horusoe is preferably used.

The glass chopped strand production apparatus and production method of the present invention can be used in a production process of cutting glass strands (glass fibers) into glass chopped strands, but fibers other than glass fibers (for example, synthetic fibers, carbons) (Fiber, natural fiber), and further, it can be used in applications for cutting linear objects such as metal wires.

DESCRIPTION OF SYMBOLS 10 Cutter roll 11 Rubber roll 11a Surface 100 Glass chopped strand manufacturing apparatus F Glass strand S Slip ratio S 'Standard slip ratio

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;
An apparatus for producing glass chopped strands comprising:
The rubber roll and the cutter roll have a slip ratio S of the cutter roll with respect to the rubber roll represented by the following formula (1):
S (%) = (v1 / v2−1) × 100 (1)
v1: Peripheral speed of the outer peripheral surface of the cutter roll v2: A glass chopped strand manufacturing apparatus that rotates so that the peripheral speed of the outer peripheral surface of the rubber roll always varies with a positive value.
The apparatus for producing a glass chopped strand according to claim 1, wherein the slip ratio S is set so as to vary periodically.
The apparatus for producing a glass chopped strand according to claim 1, wherein the slip ratio S is set to vary randomly.
The glass chopped strand manufacturing apparatus according to claim 1, wherein the slip ratio S is set so as to fluctuate within a certain range at random time periods.
The apparatus for producing glass chopped strands according to claim 1, wherein the slip ratio S is set so as to vary in a random range at a constant time period.
The apparatus for producing a glass chopped strand according to claim 1, wherein the slip ratio S is set so as to vary according to a certain rule.
The glass chopped strand manufacturing apparatus according to any one of claims 1 to 6, wherein the slip ratio S is set to vary within a range of ± 1% from a reference slip ratio S '.
The glass chopped strand manufacturing apparatus according to any one of claims 1 to 7, wherein the slip ratio S varies by sequence control.
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 the execution of the cutting step, the rubber roll and the cutter roll have a slip ratio S of the cutter roll with respect to the rubber roll represented by the following formula (1):
S (%) = (v1 / v2−1) × 100 (1)
v1: Peripheral speed of the outer peripheral surface of the cutter roll v2: A method of manufacturing a glass chopped strand that rotates so that the peripheral speed of the outer peripheral surface of the rubber roll always varies with a positive value.