JP2020044760A - Manufacturing method and manufacturing apparatus of rubber member - Google Patents

Abstract

To provide a manufacturing technique of a rubber member capable of providing an integrated rubber member formed by satisfactorily pressure-bonding a base material and a rubber sheet without an occurrence of creases and air pockets, even when pressure-bonding the rubber sheet onto the base material which has unevenness on the surface.SOLUTION: A manufacturing method of a rubber member is for manufacturing a rubber member in which a base material and a rubber sheet are integrated by pressure-bonding the rubber sheet onto the surface of the base material. The manufacturing method of the rubber member includes: a bladder pressure-bonding step of pressure-bonding the rubber sheet overlapped on the surface of the base material onto the base material by air pressure using an inflated bladder inside of which is filled with air; and a roller pressure-bonding step of pressure-bonding the rubber sheet onto the base material using a pressing roller configured by aligning a plurality of disk-shaped disk rollers. The bladder pressure-bonding step and the roller pressure-bonding step are continuously performed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and an apparatus for producing a rubber member for producing a rubber member in which a rubber sheet is integrated with a substrate by pressing a rubber sheet on the surface of a substrate.

  In the production of pneumatic tires, it is generally performed to integrate various unvulcanized rubber members cut to a predetermined length by pressing and bonding, for example, different types of rubber. An unvulcanized rubber sheet is applied to the required location on the surface of the rubber member as a base material for the purpose of maintaining the adhesion between the members or covering a different color rubber such as white embossed on the black rubber of the base. Crimping and pasting are performed.

  At this time, usually, integration is achieved by pressing using a columnar pressing roller, but it is effective for integration of a flat base material and a rubber sheet, but it is effective as a side wall or the like. When a rubber sheet is pressed against a substrate that has irregularities or steps, the rubber sheet cannot be pressed along the surface shape of the substrate, and air may flow between the substrate and the rubber sheet due to insufficient pressure. There is a risk of remaining. Such air residue causes poor adhesion and poor appearance between the base material and the rubber sheet in the vulcanized product tire, and has to be discarded as scrap.

  In view of this, there has been proposed a rubber sheet pressing device in which individual disc rollers are moved up and down in accordance with the surface shape of a base material by using a pressing roller formed of a plurality of disc rollers (for example, see Patent Reference 1).

  However, the pressing roller constituted by a plurality of disk rollers has a problem that the rubber sheet is likely to wrinkle when pressed.

  In addition, instead of the roller, it is conceivable to press the rubber sheet by using a bladder that expands by injecting air.However, the bladder is made of rubber and expands in an elliptical shape by injecting air. In some cases, it may not be possible to uniformly press the entire width of the rubber sheet, and air may remain.

JP 2017-56665 A

  The present invention has been made in view of the above-described problems, and even when a rubber sheet is pressure-bonded to a substrate having irregularities on the surface, the substrate and the rubber sheet are sufficiently pressed without wrinkles or air residue. An object of the present invention is to provide a technique for manufacturing a rubber member that can provide a rubber member that has been integrated.

  The present inventor has conducted intensive studies on the solution of the above-described problems, and found that the invention described below can solve the above-mentioned problems, and has completed the present invention.

The invention described in claim 1 is
A method for producing a rubber member, comprising: pressing a rubber sheet on a surface of a substrate to produce a rubber member in which the substrate and the rubber sheet are integrated,
Using a bladder that is filled with air and inflated, a bladder pressure bonding step of pressing the rubber sheet superimposed on the surface of the substrate to the substrate by air pressure,
Using a pressing roller composed of a plurality of disk-shaped disk rollers arranged side by side, comprising a roller pressing step of pressing the rubber sheet to the base material,
A method for producing a rubber member, wherein the bladder pressure bonding step and the roller pressure bonding step are performed continuously.

The invention described in claim 2 is
The method for manufacturing a rubber member according to claim 1, wherein the roller pressing step is performed subsequent to the bladder pressing step.

The invention according to claim 3 is
The method for manufacturing a rubber member according to claim 1, wherein the bladder pressure bonding step is performed after the roller pressure bonding step.

The invention described in claim 4 is
The method according to any one of claims 1 to 3, wherein the substrate is a substrate having an uneven surface.

The invention according to claim 5 is
The method according to any one of claims 1 to 4, wherein the base material is a sidewall.

The invention according to claim 6 is
The base material having irregularities on the surface is a base material in which a concave portion having a depth of 1.5 times or more the thickness of the rubber sheet is formed at a central portion in a width direction. 3. A method for producing a rubber member according to (1).

The invention according to claim 7 is
The method according to any one of claims 1 to 6, wherein a thickness of the rubber sheet is 0.3 to 2.0 mm.

The invention according to claim 8 is
The said bladder press-fitting process WHEREIN: The filling of the said air is adjusted so that the internal pressure of the said bladder may be 0.02-0.05MPa, The Claim 1 characterized by the above-mentioned. This is a method for producing a rubber member.

The invention according to claim 9 is
A rubber member manufacturing apparatus for manufacturing a rubber member in which a rubber sheet is pressure-bonded to a surface of a base material and the base material and the rubber sheet are integrated,
A transport conveyor for transporting the base material,
At a predetermined position of the substrate to be transported on the transport conveyor, a rubber sheet supply device that supplies the rubber sheet at a speed equal to the transport speed of the substrate,
A bladder for pressing the rubber sheet,
And a pressing roller for pressing the rubber sheet,
The bladder and the pressing roller are provided downstream from a position where the conveyor and the rubber sheet supply device merge,
The bladder is rotatably supported by a rotating shaft provided in a direction perpendicular to the transport direction above the transport conveyor, and is configured to expand by filling in air.
The pressing roller is formed by a plurality of disk-shaped disk rollers supported individually and rotatably in a radial direction by rotating shafts provided at right angles to a conveying direction above the conveying conveyor. This is an apparatus for manufacturing a rubber member.

The invention according to claim 10 is
Each of the disk rollers has a width of 2 to 5 mm, and a cylindrical sponge roller is fitted between an inner peripheral surface and an outer peripheral surface of the rotating shaft, and is supported by the rotating shaft via the sponge roller. The rubber member manufacturing apparatus according to claim 9, wherein the rubber member manufacturing apparatus is configured as described above.

  According to the present invention, even when a rubber sheet is pressure-bonded to a substrate having irregularities on the surface, the substrate and the rubber sheet are fully pressed and integrated without generating wrinkles or air residue. The present invention can provide a technique for manufacturing a rubber member that can provide a rubber member that has been improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view explaining the whole structure of the manufacturing apparatus of the rubber member which concerns on one Embodiment of this invention. 1 is a schematic longitudinal sectional view of a bladder according to an embodiment of the present invention. FIG. 2 is a schematic vertical sectional view of a pressing roller according to the embodiment of the present invention. It is a schematic front view showing arrangement of a base material, a rubber sheet, and a bladder in a bladder pressure bonding process of one embodiment of the present invention. It is a schematic front view which shows the state of a base material, a rubber sheet, and a bladder in the bladder pressure bonding process of one Embodiment of this invention. FIG. 2 is a schematic front view showing the arrangement of a base material, a rubber sheet, and a pressing roller in a roller pressing step according to an embodiment of the present invention. FIG. 3 is a schematic front view illustrating a state of a base material, a rubber sheet, and a pressing roller in a roller pressing step according to the embodiment of the present invention. FIG. 3 is a diagram illustrating a pressure-bonded state when pressure-bonded by a bladder and a pressing roller in one embodiment of the present invention. It is a figure which shows the crimping | compression-bonding state at the time of crimping | bonding only with a bladder in one Embodiment of this invention.

  Hereinafter, based on embodiments, the present invention will be specifically described with reference to the drawings.

[1] Overview of the present embodiment In the method for manufacturing a rubber member according to the present embodiment, a rubber sheet is pressure-bonded to the surface of a base material to manufacture a rubber member in which the base material and the rubber sheet are integrated. In doing so, it has the following features.
(1) A bladder pressing step of pressing a rubber sheet laminated on the surface of the base material to the base material by air pressure using a bladder expanded by being filled with air is provided.
(2) A roller pressing step of pressing the rubber sheet to the base material using a pressing roller composed of a plurality of disk-shaped disk rollers is provided.
(3) The bladder pressure bonding step and the roller pressure bonding step are performed continuously.

  With such a configuration, the effect of the bladder pressure bonding and the effect of the roller pressure bonding are combined, and even when the rubber sheet is pressure-bonded to the substrate having unevenness on the surface, the base material and the rubber sheet Can be sufficiently press-bonded without generating residual air to form an integrated rubber member.

  The manufacturing method described above is performed by the rubber member manufacturing apparatus according to the present embodiment including the bladder that presses the rubber sheet and the pressing roller.

[2] Specific aspects of the present embodiment First, a manufacturing apparatus for performing the manufacturing method of the present embodiment will be described, and then a specific manufacturing method will be described.

1. Rubber Member Manufacturing Apparatus (1) Overview The rubber member manufacturing apparatus according to the present embodiment mainly has the following configuration.
(A) a conveyor for conveying the base material (b) a rubber sheet feeding device for feeding a rubber sheet to a predetermined position of the base material conveyed on the conveyor at a speed equal to the conveyance speed of the base material (c) conveyance A bladder that is rotatably supported by a rotating shaft provided in a direction perpendicular to the conveying direction above the conveyor and is configured to expand when air is filled in (d) above the conveying conveyor in the conveying direction. Holding rollers formed by a plurality of disk-shaped disk rollers that are individually rotatable and radially swingable by rotating shafts provided at right angles to each other.

(2) Specific Configuration FIG. 1 is a schematic side view illustrating the overall configuration of the rubber member manufacturing apparatus according to the present embodiment. In FIG. 1, 1 is a rubber member manufacturing apparatus, 2 is a bladder, 3 is a pressing roller, 4 is a conveyor, and 5 is a rubber sheet supply apparatus. SW is a base material (sidewall), and GS is a rubber sheet (vinyl rubber). Arrows indicate the transport direction of the substrate SW.

(A) Transport Conveyor The transport conveyor 4 transports the base material SW formed in a long strip shape by extrusion or the like so that the surface provided with the unevenness is on the upper side, and the arrow SW.

(B) Rubber Sheet Supply Device The rubber sheet supply device 5 is provided above the transport conveyor 4 and unwinds the rubber sheet GS wound in a roll shape at the same speed as the transport speed of the base material SW. It is supplied to the junction with the conveyor 4.

(C) Bladder The bladder 2 is provided at the confluence of the conveyor 4 and the rubber sheet supply device 5, and presses the rubber sheet GS against the base material SW by the bladder 2 expanded by filling air.

  FIG. 2 is a schematic vertical cross-sectional view of the bladder 2, in which reference numeral 21 denotes a rotating shaft, and a denotes a filled air. As shown in FIG. 2, the bladder 2 has a cylindrical shape, and is rotatably supported by a horizontal rotating shaft 21 provided above the transport conveyor in a direction perpendicular to the transport direction. The bladder 2 is made of rubber, and expands in an elliptical shape by filling in the air a, and presses the rubber sheet GS on the expanded surface.

  The pressure of the air a of the bladder 2 is preferably adjusted to 0.02 to 0.05 MPa. Thereby, the rubber sheet GS can be pressed sufficiently by following the irregularities on the surface of the base material SW.

(D) Holding Roller In the present embodiment, the holding roller 3 is provided further downstream of the bladder 2, and is provided by a horizontal rotating shaft provided in a direction perpendicular to the carrying direction above the carrying conveyor. It is formed of a plurality of disk-shaped disk rollers which are individually rotatable and supported so as to be swingable in the radial direction. The rubber sheet GS can be further pressed against the base material SW by each disk roller of the pressing roller 3 moving up and down in accordance with the unevenness of the surface of the base material SW.

  FIG. 3 is a schematic vertical sectional view of the pressing roller 3, in which 31 is a rotating shaft, 32 is a disk roller, and 33 is a sponge roller. As shown in FIG. 3, the pressing roller 3 includes a plurality of disk rollers 32. A cylindrical sponge roller 33 is fitted between the inner peripheral surface of the disk roller 32 and the rotating shaft 31 so that the disk roller 32 can swing in the radial direction following the irregularities on the surface of the base material SW. Supported. The pressing roller 3 is supported by a cylinder so as to be pressed in the pressing direction.

  The width of each disk roller 32 is preferably 2 to 5 mm. When the width of the disk roller 32 is smaller than 2 mm, the number of disk rollers increases and the cost increases. On the other hand, when the width is larger than 5 mm, it is difficult to sufficiently follow irregularities on the surface of the base material.

  The disk roller 32 is preferably made of a lightweight resin, and among them, MC nylon (registered trademark), which is a general-purpose resin and has excellent mechanical strength and wear resistance, is particularly preferable. By using such a material, it is possible to achieve both an appropriate pressing force and the ability to follow irregularities on the surface of the base material.

  The sponge roller is preferably formed of a foamable resin such as urethane. By being formed of the above material, the followability of the pressing roller 3 to the surface of the base material can be further improved.

2. Next, a method for manufacturing a rubber member according to the present embodiment using the above-described apparatus for manufacturing a rubber member will be described.

  First, as shown in FIG. 1, while the substrate SW is placed on the transport conveyor 4 and transported, the rubber sheet GS is supplied from the rubber sheet supply device 5, so that the substrate SW is located in front of the bladder 2. And the rubber sheet GS.

  At this time, the transfer speed of the base material SW by the transfer conveyor 4 and the supply speed of the rubber sheet GS by the rubber sheet supply device 5 are set to be the same speed, and the base material SW and the rubber sheet GS Each is positioned so as to be pressed at the position.

  The combined base material SW and rubber sheet GS are transported on the transport belt to the position of the bladder 2 as they are. At this time, the bladder 2 is supported so as to freely rotate around the rotating shaft 21 (FIG. 2) in a state where the bladder 2 is expanded by being filled with air so as to have a predetermined internal pressure (0.02 to 0.05 MPa). Therefore, the rubber sheet GS in contact with the bladder 2 is pressed by the expanded bladder 2 and is pressed to the substrate SW following the irregularities of the substrate SW.

  This bladder pressure bonding step will be described in more detail with reference to FIGS. 4 is a schematic front view showing the arrangement of the base material, the rubber sheet and the bladder in the bladder pressure bonding step, and FIG. 5 is a schematic front view showing the state of the base material, the rubber sheet and the bladder in the bladder pressure bonding step.

  As shown in FIGS. 4 and 5, the base material SW generally has a recess such as a sipe formed at the center in the width direction. Since the rubber sheet GS is supplied in a state of straddling the concave portion, a gap is formed between the rubber sheet GS and the base material SW in the concave portion. The bladder 2 has a length greater than the width of the rubber sheet GS, and is arranged so that the bladder 2 covers the entire width of the rubber sheet GS.

  In the bladder pressure bonding step, the rubber sheet GS is pressed downward while rotating the bladder 2 around the rotation axis at the same linear speed as the transport speed of the rubber sheet GS and the base material SW. By pressing using the air pressure of the bladder 2 in this manner, the rubber sheet GS is deformed along the surface of the base material SW and is pressed against the base material SW.

  However, the bladder 2 may not be able to follow the surface of the base material SW at the portion where the concave portion comes into contact with the ridge due to the tension applied to the bladder 2 when pressed. In this case, as shown in FIG. There is a possibility that a gap is left at a position indicated by an arrow between the sheet GS and the base material SW, and the air becomes a pool.

  Thus, in the present embodiment, a roller pressure bonding step is provided as the next step.

  In the roller pressing step, the rubber sheet is pressed against the base material using a pressing roller composed of a plurality of disk-shaped disk rollers.

  FIG. 6 is a schematic front view showing the arrangement of the base material, the rubber sheet and the pressing roller in the roller pressing step, and FIG. 7 is a schematic front view showing the state of the base material, the rubber sheet and the pressing roller in the roller pressing step.

  As shown in FIGS. 6 and 7, the pressing roller 3 is arranged so as to be larger than the width of the rubber sheet GS and cover the entire width of the rubber sheet GS. Each disc-shaped disk roller of the pressing roller 3 can swing in the radial direction following the unevenness of the base material when pressed. Further, a large pressing force can be obtained as compared with a bladder. For this reason, the gap created between the rubber sheet GS and the base material SW in the bladder pressure bonding step can be pressed accurately by the disk roller at the corresponding position, and as shown in FIG. be able to.

3. Effects of the present embodiment As described above, according to the present embodiment, the rubber sheet GS and the base material SW can be pressure-bonded and integrated while sufficiently suppressing the occurrence of air pockets.

  In the above description, the bladder pressing step is a step before the roller pressing step, but the roller pressing step may be a step before the bladder pressing step. In this case, although sufficient pressure can be obtained by pressing with the pressing roller first, wrinkles are likely to occur on the rubber sheet. However, thereafter, by pressing with a bladder, the wrinkles are stretched and eliminated, and further pressed, so that sufficient pressure can be obtained.

  When a long rubber member is manufactured continuously, when a side wall or the like in which many concave portions such as sipes are formed on a surface is used as a base material, the occurrence of air pockets cannot be avoided in the conventional method. However, in the case of the present embodiment, even if a concave portion having a depth of 1.5 times or more the thickness of the rubber sheet is formed at the center in the width direction, the rubber sheet and the base material are separated without a gap. It is possible to continuously manufacture a long rubber member in which the generation of the air pool is suppressed by pressing.

  In addition, a rubber sheet having a thickness of 0.2 to 2.0 mm is difficult to follow the irregularities of the substrate and easily wrinkles. However, by applying the manufacturing method of the present embodiment, such a rubber sheet Also, it is possible to perform pressure bonding with no gap between the base material and wrinkles.

  The technique described in the present embodiment can provide a particularly remarkable effect when a rubber sheet such as a vinyl rubber is pressure-bonded using a sidewall as a base material.

  Hereinafter, the present invention will be described more specifically based on examples.

1. Production of Test Specimen In order to confirm the effects of the present embodiment, using three types of crimping means of only the bladder (Comparative Example 1), the pressing roller only (Comparative Example 2), the bladder and the pressing roller (Example), A rubber sheet was pressure-bonded to the surface of the sidewall to produce ten integrated rubber members, and then a product tire was manufactured.

  The bladder had an internal pressure of 0.035 MPa, and the pressing roller was composed of 23 disk rollers having a width of 5 mm.

2. Evaluation (1) Evaluation item (a) Pressure-bonded state A pressure-sensitive paper was placed on the surface of the rubber sheet, and a change in color that changed depending on the degree of pressure was observed.

(B) Air Residual The presence or absence of air residual was observed by visually observing the surface of the rubber sheet after pressure bonding.

(C) Occurrence of Wrinkles The occurrence of wrinkles on the rubber sheet surface after pressure bonding was visually observed.

(D) Tire scrap The condition between the base material and the rubber sheet in the manufactured tire was observed, and a product having peeling or poor appearance was determined as a scrap product, and the occurrence rate was determined.

(2) Evaluation results Table 1 shows the evaluation results. In addition, FIG. 8A and FIG. 8B show the results of investigation on the press-fitting state of the bladder alone (Comparative Example 1) and the pressing means of the bladder and the pressing roller (Example).

The evaluation was performed based on the following criteria.
Good: The whole crimped state is fully crimped. No air residue is generated. No wrinkles are generated. Possible: Part is not crimped partially. Air is partially generated. Wrinkles are partially not generated. : There are many places where crimping is not possible. Air remains on the entire surface.

  8A and 8B, the vertical direction is the width direction of the rubber member, the upper and lower edges are portions where the pressure-sensitive paper is placed on the ridges of the sidewalls, and the central portion is a concave portion. It is a place installed above. The manner in which the pressing force is applied is indicated by the color density, and the darker portions indicate the portions where a large pressing force is applied.

  From Table 1, it can be seen that in the examples, the tire scrap ratio was 0%, which is an extremely excellent evaluation result. This result is based on the fact that the evaluation results of the crimped state, the remaining air and the occurrence of wrinkles were good, and the reason that the crimped state was good and the generation of the remaining air was suppressed was as shown in FIG. 8A. This is because the pressing force necessary for close contact was applied over almost the entire area even in the concave portion where the pressing force was hardly applied in the conventional technology.

  On the other hand, in Comparative Example 1 in which the pressing means is only the bladder, as shown in FIG. 8B, there is a portion where the pressing force is not applied to the concave portion, and the remaining air is generated, so that the tire scrap rate becomes 1.2%. ing. In Comparative Example 2 in which only the pressing roller is used, the rubber sheet is wrinkled, and the tire scrap rate is 8%.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments. Various changes can be made to the above embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Rubber member manufacturing apparatus 2 Bladder 3 Holding roller 4 Conveyor 5 Rubber sheet supply devices 21 and 31 Rotary shaft 32 Disk roller 33 Sponge roller a Air GS Rubber sheet (vinyl rubber)
SW base material (sidewall)

Claims (10)

A method for producing a rubber member, comprising: pressing a rubber sheet on a surface of a substrate to produce a rubber member in which the substrate and the rubber sheet are integrated,
Using a bladder that is filled with air and inflated, a bladder pressure bonding step of pressing the rubber sheet superimposed on the surface of the substrate to the substrate by air pressure,
Using a pressing roller composed of a plurality of disk-shaped disk rollers arranged side by side, comprising a roller pressing step of pressing the rubber sheet to the base material,
A method for producing a rubber member, wherein the bladder pressure bonding step and the roller pressure bonding step are performed continuously.   The method for producing a rubber member according to claim 1, wherein the roller pressure bonding step is performed after the bladder pressure bonding step.   The method for manufacturing a rubber member according to claim 1, wherein the bladder pressure bonding step is performed after the roller pressure bonding step.   The method for producing a rubber member according to any one of claims 1 to 3, wherein the substrate is a substrate having an uneven surface.   The method according to any one of claims 1 to 4, wherein the base material is a sidewall.   The base material having irregularities on the surface is a base material in which a concave portion having a depth of 1.5 times or more the thickness of the rubber sheet is formed at a central portion in a width direction. 5. The method for producing a rubber member according to item 1.   The method for manufacturing a rubber member according to any one of claims 1 to 6, wherein the thickness of the rubber sheet is 0.3 to 2.0 mm.   The said bladder press-fitting process WHEREIN: The filling of the said air is adjusted so that the internal pressure of the said bladder may be 0.02-0.05MPa, The Claim 1 characterized by the above-mentioned. A method for producing a rubber member. A rubber member manufacturing apparatus for manufacturing a rubber member in which a rubber sheet is pressure-bonded to a surface of a base material and the base material and the rubber sheet are integrated,
A transport conveyor for transporting the base material,
At a predetermined position of the substrate to be transported on the transport conveyor, a rubber sheet supply device that supplies the rubber sheet at a speed equal to the transport speed of the substrate,
A bladder for pressing the rubber sheet,
And a pressing roller for pressing the rubber sheet,
The bladder and the pressing roller are provided downstream from a position where the conveyor and the rubber sheet supply device merge,
The bladder is rotatably supported by a rotating shaft provided in a direction perpendicular to the transport direction above the transport conveyor, and is configured to expand by filling in air,
The pressing roller is formed by a plurality of disk-shaped disk rollers that are individually rotatably supported by rotating shafts provided in a direction perpendicular to a transport direction above the transport conveyor and are swingable in a radial direction. An apparatus for manufacturing a rubber member, comprising:   Each of the disk rollers has a width of 2 to 5 mm, and a cylindrical sponge roller is fitted between an inner peripheral surface and an outer peripheral surface of the rotating shaft, and is supported by the rotating shaft via the sponge roller. The apparatus for manufacturing a rubber member according to claim 9, wherein the apparatus is configured as follows.

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