JP2002326245A - Unvulcanized rubber sheet manufacturing method and manufacturing apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unvulcanized rubber sheet manufacturing method capable of providing an unvulcanized rubber in an amount necessary for a next process at a necessary time by reduced investment by molding a small amount of a short rubber sheet by a necessary length by a small apparatus and reducing products in process while rapidly outputting feedback data. SOLUTION: A predetermined amount of the unvulcanized rubber is supplied to a rubber kneading machine 16 and wound around a fixed roll 1 to be heated. Thereafter, the rubber sheet 20 wound around the fixed roll 1 is delivered over a predetermined width to be fed to the lower part of a movable roll 2 by a feed means 22 and bonded to the movable roll 2 to be supplied to a bank 12. A series of these processes are repeated to set the rubber sheet 1 to predetermined thickness and width. Succeedingly, the roll machine 16 and feed means 5 and 6 are stopped at the same time and the rubber sheet 20 delivered to the feed means 22 is wound or cut into a constant dimension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention requires an unvulcanized rubber sheet (also simply referred to as a rubber sheet) to be laminated on a core cord, a cored bar or the like in a process of manufacturing a small lot of rubber belts, rubber rollers and the like. The present invention relates to a method and an apparatus for manufacturing an unvulcanized rubber sheet that can be manufactured only for a length (for example, a length of less than 10 m).

[0002]

2. Description of the Related Art A conventional method for producing an unvulcanized rubber sheet is as follows.
As a pre-process of the calendering process, a rubber kneading roll machine combining a fixed roll and a moving roll is provided, and the unvulcanized rubber is heated and mixed (called hot-heating) until it has a rollable hardness. It was formed and wound as a long rubber sheet by a calender device composed of rolls. Small lot, small amount of rubber belt (power transmission belt)
In the case of producing a rubber sheet, etc., a considerable amount of unvulcanized rubber sheet necessary for operating a calendering apparatus including a roll machine was produced, and the sheet was cut to a required length and used. After the required length of rubber sheet is used, store the remaining amount as work in progress until the next order, or repeat and repeat the sheeting to the dimensions of another product. Used as

[0003]

However, as described above, the remaining amount of the rubber sheet manufactured in a long length has a problem that the period until the next order is made is uncertain, and the remaining amount of the rubber sheet remains as a work in process. In addition, when staying for a long time, quality problems such as "burn" may occur. Or, when re-seating and re-sheeting to the dimensions of another product, there is a problem that loss of sheeting cost and downgrade to a lower grade product leads to an increase in material cost. Furthermore, the calendering device is large, the capital investment is large, and a large number of operators are required. To operate this process, a considerable amount of unvulcanized rubber (amount for simultaneously operating the heating process and the rolling process) is required. Must be prepared, and
There is a problem that the process from supplying the unvulcanized rubber to the roll machine to checking the quality of the rubber sheet is long, and the feedback of quality information is delayed.

According to the present invention, a method for producing an unvulcanized rubber sheet which can produce a relatively short rubber sheet only in a required length, has a small investment, reduces work in process, and provides quick feedback of quality information. And a manufacturing apparatus.

[0005]

According to a first aspect of the present invention, there is provided a method of manufacturing a rubber sheet, comprising the steps of: using a rubber kneading roll machine having a fixed roll and a moving roll; A method of manufacturing an unvulcanized rubber sheet for producing a required amount of an unvulcanized rubber sheet, comprising supplying a predetermined amount of unvulcanized rubber to an upper valley of the rubber kneading roll machine and forming a sheet through a roll gap. Rolled and wound on the fixed roll, after heating until the surface of the unvulcanized rubber sheet wound on the fixed roll is substantially smooth, cut out the unvulcanized rubber sheet to a predetermined width, A series of steps of conveying by means of conveying means, below the fixed roll, to below the moving roll, pressing and adhering to the moving roll, and supplying the same to the upper valley of the rubber kneading roll machine, are repeated. Forming the vulcanized rubber sheet to a predetermined thickness and width; subsequently, simultaneously stopping the rubber kneading roll machine and the conveying means, winding or sizing the unvulcanized rubber sheet cut out on the conveying means. It is characterized by cutting.

A predetermined amount of unprocessed material is placed in the upper valley (the space above the roll gap between the fixed roll and the moving roll) of a rubber kneading roll machine (also simply referred to as a rolling machine) having a fixed roll and a moving roll. Supply vulcanized rubber and heat until the surface is almost smooth. The predetermined amount is the minimum amount necessary to operate the roll machine (the minimum bank required to wind the unvulcanized rubber around the roll machine) to the amount required as an unvulcanized rubber sheet (also simply referred to as a rubber sheet). Is the amount added. The bank refers to unvulcanized rubber accumulated in the upper trough. The warming means that the temperature of the unvulcanized rubber is raised by the heat of the preheated roll machine or the heat generated by the kneading operation, so that the unvulcanized rubber is softened and the sheet can be formed.

[0007] The rubber sheet that has been heated and wound around the fixed roll is cut into a predetermined width (a width designed from the product width). The cut-out rubber sheet is conveyed to the lower part of the moving roll via the lower part of the fixed roll by the conveying means, pressed and adhered to the moving roll, and supplied to the upper valley of the roll machine. In the upper valley, a bank of unvulcanized rubber rotates.

[0008] The rubber sheet formed in the roll gap in this way forms a series of steps in which it is again supplied to the upper valley via the lower portion of the fixed roll and the moving roll by the conveying means. By repeating this series of steps, the thickness of the rubber sheet is set to a predetermined thickness. The predetermined thickness is a thickness designed as the thickness of the rubber sheet, and is a thickness obtained by moving the moving roll to adjust the roll gap.

When the rubber sheet is attached to the moving roll and supplied to the upper valley, the bank of the upper valley becomes uniform in the width direction, and the sheet thickness tends to become uniform. In addition, a conveyor belt or the like is used as the transporting means, which makes it possible to reduce a change in thickness during the transporting, and to keep the thickness uniform in a winding step described later in detail.

Subsequently, the roll machine and the transporting means are stopped simultaneously, and the rubber sheet cut out on the transporting means is wound up or cut to a fixed size so as not to change the dimensions. By stopping the roll machine and the like,
The next step such as winding can be easily and completely performed, and the effect of not changing the dimensions of the cut rubber sheet can be expected.

In the method for producing an unvulcanized rubber sheet according to claim 2, when the unvulcanized rubber sheet cut out on the conveying means is wound, the rubber kneading roll machine and the conveying means are simultaneously operated. After stopping, the winding means is brought into contact with the surface of the unvulcanized rubber sheet adhering to the moving roll, and the unvulcanized rubber sheet is cut in the width direction, and the end is applied to the winding means. Winding, while applying an adhesion preventing means between the unvulcanized rubber sheets, the rubber kneading roll machine,
The conveying means is restarted, and the unvulcanized rubber sheet formed into a predetermined thickness and width is wound up.

The roll machine and the transporting means are simultaneously stopped, and the winding shaft of the winding means is brought into contact with the surface of the rubber sheet attached to the moving roll, and the width of the rubber sheet is increased near above the winding shaft. Cut in the direction. Since the moving roll is stopped, the cut rubber sheet end can be accurately wound around the winding shaft. Subsequently, the roll machine, the transporting means and the like are restarted, and the rubber sheet cut out by the transporting means and the like is wound around a winding shaft. Since the rubber sheet is pressed against the moving roll, the entire width of the rubber sheet is uniformly wound on the winding shaft, and the winding is performed without causing a defect such as wrinkling or a change in thickness. By winding the rubber sheet while applying an adhesion preventing means (for example, inserting a liner) between the rubber sheets, the rubber sheet can be smoothly rewound when used.

[0013] A method of manufacturing an unvulcanized rubber sheet according to claim 3, wherein the unvulcanized rubber sheet cut out from the fixed roll is provided with a take-off roll provided with an axis parallel to the fixed roll. The thickness of the unvulcanized rubber sheet is measured by a thickness sensor with reference to the upper surface of the take-off roll, and the thickness of the unvulcanized rubber sheet is adjusted to a predetermined thickness. Features.

The take-off roll has its axis parallel to the axis of the fixed roll and is mounted close to the fixed roll, so that the take-off roll functions as a reference roll and is taken up on its upper surface. The thickness of the rubber sheet is measured by a thickness sensor. The distance between the roll gap for determining the thickness and the thickness measurement position is short, and the time for reflecting the measurement result to the roll gap adjusting means is short.

The manufacturing position of the unvulcanized rubber sheet according to claim 4 is an apparatus for easily carrying out the method for manufacturing an unvulcanized rubber sheet according to claim 1 or 2, wherein a rubber kneading roll is provided. A rubber sheet manufacturing apparatus for manufacturing a relatively short unvulcanized rubber sheet by a required length using a machine, comprising: a rubber kneading roll machine having a fixed roll and a moving roll; A pair of sheet width cutters that are possible and are provided at predetermined intervals in the axial direction of the fixed roll, and the fixed roll is attached near an upper position of the fixed roll in contact with the sheet width cutter. A take-off roll having an axis parallel to the axis of the take-off roll, and conveying the unvulcanized rubber sheet extended from near below the take-off roll, below the fixed roll, to below the moving roll. A step, a guide roll provided above the downstream end of the conveying means and capable of coming into contact with and separating from the moving roll, and a sheet winding means provided above the guide roll and capable of coming into contact with and separating from the moving roll. It is characterized by having.

The pair of sheet width cutters can be brought into contact with and separated from the fixed roll, and are provided at predetermined intervals in the axial direction of the fixed roll. The unvulcanized rubber sheet adhered to the fixed roll can be removed. Cut to the required width. Since the take-off roll is attached near the upper side of the position where the sheet width cutter abuts on the fixed roll, and its axis is parallel to the axis of the fixed roll, the width of the cut-off rubber sheet is fixed to the fixed roll. Can be cut out with less change in thickness and width. Also, this take-off roll
It is also used as a reference roll for thickness measurement according to the third aspect.

The conveying means of the unvulcanized rubber sheet is, for example,
A first conveyor is extended from near below the take-off roll to below the fixed roll, and a second conveyor is extended from near the lower end of the first conveyor to below the moving roll. Since the unvulcanized rubber sheet picked up by the take-off roll can be conveyed below the moving roll without applying tension, the dimension of the unvulcanized rubber sheet does not change in this step. In addition, since the second conveyor is extended to below the moving roll, it is easy to supply the unvulcanized rubber sheet to the bank along the moving roll. Further, since the guide roll can contact and separate from the moving roll, the rubber sheet can be easily attached to the moving roll. The sheet winding means is provided above the downstream end of the second conveyor (above the guide roll), is capable of approaching and separating from the moving roll, and easily winds the unvulcanized rubber sheet adhered to the moving roll. be able to.

According to a fifth aspect of the present invention, there is provided an apparatus for manufacturing an unvulcanized rubber sheet, wherein a thickness sensor which can approach and separate from an upper surface of the take-off roll is provided for measuring the thickness of the unvulcanized rubber sheet. It is characterized by being.

By measuring the thickness using the take-off roll approaching the fixed roll as a reference roll, the measurement result can be promptly fed back to the thickness adjusting means and the thickness can be continuously measured.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a method and an apparatus for producing a rubber sheet according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a rubber sheet manufacturing apparatus according to the present invention, and FIGS. 2 and 3 are front views illustrating a method for manufacturing a rubber sheet according to the present invention.

First, an apparatus for producing an unvulcanized rubber sheet according to the present invention will be described with reference to FIG. Rubber kneading roll machine 16
Comprises a fixed roll 1 and a moving roll 2 as a pair.
The fixed roll 1 has a horizontal axis, is connected to driving means (an electric motor, a speed reducer, etc.) (not shown) and can rotate in the direction of arrow y, and this position is a reference position. The moving roll 2 is provided with its axis parallel to the axis of the fixed roll 1, is movable toward and away from the fixed roll 1, is rotatable in the direction of the arrow z, and is fixed by a transmission means (not shown). Rotated in conjunction with. Both the fixed roll 1 and the moving roll 2 can be heated and cooled, and a predetermined roll gap (also referred to as a nip) is provided between the two rolls. In FIG. 1, a fixed roll 1 and a moving roll 2
Unvulcanized rubber is supplied to the upper valley to form a bank 12, which is rolled into a sheet at a nip 15 and circulated along the fixed roll 1 as a return rubber 11 to the bank 12.

Below the fixed roll 1, a width cutter 14 supported by a support 18 is attached so as to be able to contact and separate therefrom. The width cutters 14 are provided in pairs in the width direction of the fixed roll 1 at predetermined intervals set by the width of the rubber sheet to be manufactured. The take-off roll 3 is provided near the upper side of the width cutter 14 with its axis parallel to the axis of the fixed roll 1. This take-off roll 3
The roll is also used as a reference for measuring the thickness of the rubber sheet 20 to be cut out. The rubber sheet 20 comes into contact with the upper surface of the roll and is sent to the first conveyor 5. Above the take-off roll 3, a thickness sensor 4 that can approach and separate from the take-off roll 3 is provided to measure the thickness of the rubber sheet 20.

The conveying means 22 includes a first conveyor 5, a second conveyor 6, and a guide roll 7, and the first conveyor 5
The second conveyor 6 is extended from a position approaching the lower portion of the take-off roll 3 to below the fixed roll 1, and the second conveyor 6 is located outside the lower end of the first conveyor 5 outside the moving roll 2 (the opposite side facing the fixed roll 1). ). The conveying means 22 conveys the rubber sheet 20 taken from the fixed roll 1 to the take-off roll 3 by the first conveyor 5 and the second conveyor 6 without changing the dimensions.

The guide roll 7 is located above the downstream end of the second conveyor 6 and is attached to the moving roll 2 so as to be able to contact and separate therefrom. The guide roll 7 approaches the moving roll 2 and presses the rubber sheet 20 against the moving roll 2 (see FIG. 2, a two-dot chain line circle 7 ′ indicates a position where the guide roll 7 is separated). The pressed rubber sheet 20 is the moving roll 2
Along the outside of the bank. In this way, a series of steps in which the rubber sheet 20 circulates to the fixed roll 1, the take-off roll 3, the conveying means 22, and the moving roll 2 are formed. While repeating this series of steps, the rubber sheet 2
The thickness of 0 is adjusted to a predetermined thickness (details will be described later / FIG. 2).

The winding means 17 comprises a winding shaft 8 mounted on the winding stand 10 and a liner roll 9 mounted below the winding shaft 8.
A guide roll 7 is provided between the second conveyor 6 and the take-up shaft 8 so as to be able to come into contact with and separate from the moving roll 2. After the guidance, the rubber sheet 20 approaches and is pressed against the moving roll 2.

Next, an embodiment of a method for manufacturing a rubber sheet will be described with reference to FIGS. 2 and 3 in addition to FIG. FIG. 1 shows a first step after the start of work, FIG. 2 shows a second step, and FIG. 3 shows a third step.

The first step shown in FIG. 1 is a heating step, in which the roll machine 16 is rotated in the directions of arrows y and z to adjust the temperature to a predetermined temperature, and then is set between the upper valley between the fixed roll 1 and the moving roll 2. The unvulcanized rubber is supplied to form the bank 12, and the unvulcanized rubber is kneaded and softened repeatedly and wound around the fixed roll 1. In this step, the guide roll 7 and the winding means 7 are separated from the moving roll 2.

The second step shown in FIG.
In this step, the take-off roll 3, the first conveyor 5 and the second conveyor 6 are started, and the rubber sheet 20 wound around the fixed roll 1 is stably fixed to the temporary thickness. It is cut out from the roll 1 (cut and separated), and is taken up on the upper surface of the take-off roll 3. The rubber sheet 20 is continuously drawn on the upper surface of the second conveyor 6 via the first conveyor 5, and is conveyed to a position below the moving roll 2. Note that the rubber sheet 20 is cut to a predetermined width by the width cutter 14. Further, the guide roll 7 is guided by the upper surface of the guide roll 7 and
, The rubber sheet 20 is pressed against and adhered to the outer peripheral surface of the moving roll 2 and supplied to the bank 12. Since the sheet is supplied by being attached, the sheet is supplied to the entire width of the bank 12 and has an effect of making the thickness of the sheet uniform in the width direction.

Thus, the rubber sheet 20 is separated from the fixed roll 1, moved in the order of the take-off roll 3, the first conveyor 5, the second conveyor 6, the guide roll 7, and the moving roll 2, and supplied to the bank 12. Is formed. While repeating this series of steps, the thickness sensor 4 is moved closer to the take-off roll 3 and is moved closer to the top of the rubber sheet 20 to measure the thickness of the rubber sheet 20. The rubber sheet 20 is adjusted to a predetermined thickness by adjusting means (not shown) according to the measurement data. Since the distance between the nip 15 and the thickness sensor 4 is short and the thickness of the rubber sheet 20 immediately after being formed by the nip 15 can be measured, the thickness adjustment can be performed quickly.

The third step shown in FIG. 3 is a step of winding the rubber sheet 20 having a predetermined thickness and width. After the completion of the second step, the rolling machine 16 and the conveying means 22 (take-off roll) 3, the first conveyor, the second conveyor) and the like are stopped simultaneously, and the winding shaft 8 of the winding means 17 is stopped.
Is brought into contact with the rubber sheet 20 attached to the moving roll 2,
The rubber sheet 20 is cut in the width direction near the take-up shaft 8 and separated, and the leading end is wound around the take-up shaft 8.
Then, the roll machine 16 and the conveying means 22 are restarted,
The rubber sheet 20 of a required length cut out from the position of the winding shaft 8 by the conveying means 22 is wound around the winding shaft 8. If the required length is long, the rubber sheet 20 rolled after restart can also be wound.

As a means for preventing the adhesion of the rubber sheet 20, for example, the liner 13 drawn out from the liner roll 9 is continuously sandwiched between the rubber sheets 20 before restart. This is because the rubber sheet 20 can be easily rewound when used. Alternatively, a release agent may be ground.

According to the above-described procedure, a relatively short rubber sheet 20 can be produced with a required length and high thickness accuracy.

[0033]

As is apparent from the above description,
The method and apparatus for producing an unvulcanized rubber sheet of the present invention have the following effects. The method for producing an unvulcanized rubber sheet according to claim 1 is performed by repeating a series of steps of forming a rubber sheet by a roll machine and a conveying unit.
With a simple device, a rubber sheet that is short and has good thickness accuracy can be manufactured in the required length when needed. Since the required length can be manufactured, the work in process is reduced, and the feedback of quality information has the effect of being faster.

In the method for producing an unvulcanized rubber sheet according to the second aspect, the rubber sheet molded to a predetermined thickness is directly wound up by the moving roll, so that the dimension of the molded rubber sheet is wound up as it is. be able to.

In the method for producing an unvulcanized rubber sheet according to the third aspect, since the thickness of the rubber sheet is measured immediately after the rubber sheet is separated from the fixed roll, the time for feeding back to the manual throw for adjusting the roll gap of the roll machine is provided. , The time required for the rubber sheet to have a predetermined thickness is shortened, the quality of the rubber sheet is prevented from deteriorating, and material loss can be reduced.

An apparatus for producing an unvulcanized rubber sheet according to a fourth aspect is an apparatus for effectively realizing the production method according to the first and second aspects, wherein a series of steps for forming a rubber sheet are provided. Can be reliably repeated, and a rubber sheet having a predetermined length can be continuously wound after molding and sent to the next step. In addition, by repeatedly using the roll machine, a large-scale facility such as a calender machine is not required, and the in-process work is greatly reduced.

An apparatus for producing an unvulcanized rubber sheet according to a fifth aspect of the present invention is a production apparatus suitable for carrying out the production method according to the third aspect, wherein the thickness of the rubber sheet is measured by a thickness sensor which can be moved close to and away from the take-off roll. The gap between the roll gap that determines the thickness of the rubber sheet and the thickness measurement position is short,
The time for thickness adjustment can be minimized.

[Brief description of the drawings]

FIG. 1 is a front view showing an apparatus for manufacturing a rubber sheet according to the present invention and showing a first step of a manufacturing method according to the present invention.

FIG. 2 is a front view showing a second step after starting the operation of the rubber sheet manufacturing method according to the present invention.

FIG. 3 is a front view showing a third step after the start of the operation of the rubber sheet manufacturing method according to the present invention.

[Explanation of symbols]

 1: fixed roll 2: movable roll 3: take-off roll 4: thickness sensor 5: first conveyor 6: second conveyor 7: guide roll 8: winding shaft 9: liner roll 12: bank 14: width cutter 15: nip 16 : Rolling machine 17: Winding means 20: Rubber sheet 22: Transport means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 7:00 B29L 7:00

Claims (5)

[Claims] An unvulcanized rubber sheet manufacturing method for manufacturing a relatively short unvulcanized rubber sheet by a required length by using a rubber kneading roll machine having a fixed roll and a moving roll, A predetermined amount of unvulcanized rubber is rolled into a sheet through a roll gap, wound around the fixed roll, and heated until the surface of the unvulcanized rubber sheet wound around the fixed roll is substantially smooth, The unvulcanized rubber sheet is cut out to a predetermined width, conveyed to a position below the moving roll through a portion below the fixed roll by a conveying means, and pressed against and adhered to the moving roll to be in an upper valley of the rubber kneading roll machine. A series of steps of supplying are repeated to form the unvulcanized rubber sheet to a predetermined thickness and width. Then, the rubber kneading roll machine and the transporting means are simultaneously stopped, and cut on the transporting means. A method for producing an unvulcanized rubber sheet, wherein the unvulcanized rubber sheet is wound or cut to a fixed size. 2. When the unvulcanized rubber sheet cut out on the conveying means is taken up, the rubber kneading roll machine and the conveying means are stopped at the same time, and then the uncured rubber sheet adhered to the moving roll is stopped. A winding means is brought into contact with the surface of the vulcanized rubber sheet, the unvulcanized rubber sheet is cut in the width direction, and an end thereof is wound around the winding means, and an adhesion preventing means is provided between the unvulcanized rubber sheets. The rubber vulcanizing roll machine and the conveying means are restarted, and the unvulcanized rubber sheet according to claim 1 is wound up to a predetermined thickness and width. Production method. 3. The unvulcanized rubber sheet cut out from the fixed roll is taken up on an upper surface of a take-off roll having an axis parallel to the fixed roll, and the upper surface of the take-off roll is used as a reference. The method for producing an unvulcanized rubber sheet according to claim 1 or 2, wherein the thickness of the unvulcanized rubber sheet is measured by a thickness sensor, and the thickness of the unvulcanized rubber sheet is adjusted to a predetermined thickness. . 4. A rubber sheet manufacturing apparatus for manufacturing a relatively short unvulcanized rubber sheet by a required length using a rubber kneading roll machine, comprising: a rubber kneading roll machine having a fixed roll and a moving roll. A pair of sheet width cutters that can be brought into contact with and separated from the fixed roll and are provided at predetermined intervals in the axial direction of the fixed roll, and above a position where the fixed roll comes into contact with the sheet width cutter. A take-off roll having an axis parallel to the axis of the fixed roll; and an unvulcanized rubber extended from near below the take-off roll, below the fixed roll, to below the moving roll. A sheet conveying means, a guide roll provided above the downstream end of the conveying means and capable of coming into contact with and separating from the moving roll, and a moving roll provided above the guide roll. An unvulcanized rubber sheet manufacturing apparatus, comprising: a sheet winding means capable of abutting and separating from a sheet. 5. The production of an unvulcanized rubber sheet according to claim 4, wherein a thickness sensor which can approach and separate from an upper surface of the take-off roll is provided for measuring a thickness of the unvulcanized rubber sheet. apparatus.