JP6572554B2 - Rubber strip manufacturing equipment - Google Patents

Description

  The present invention relates to a rubber strip manufacturing apparatus used for manufacturing a pneumatic tire.

  One of the methods for manufacturing pneumatic tires is to continuously wrap a thin tape-shaped unvulcanized rubber member (rubber strip) on a cylindrical molding drum to attach tread rubber or sidewall rubber. There is a strip wind method for forming the like.

  FIG. 6 is a side view showing an outline of a conventional rubber strip manufacturing apparatus. As shown in FIG. 6, the conventional rubber strip manufacturing apparatus is provided with an extruder 2 that continuously extrudes a rubber molded body G <b> 1 having a predetermined cross-sectional shape, and is provided at the tip of the extruder 2 to be extruded. The rubber molded body G1 is rolled into a predetermined cross-sectional shape and discharged into a rubber strip G2 to be processed into a rubber strip G2. The calendar head 3 is composed of a pair of calendar rolls 3a and 3b and one of the rolled and discharged rubber strip G2. A composite portion 4 for processing the composite tape 12 by continuously supplying and bonding a tape-like support 10 made of a resin material to the surface and a winding portion 6 for winding the composite tape 12 around the reel R are provided. (For example, Patent Document 1).

JP 2014-73589 A

  However, in a conventional rubber strip manufacturing apparatus, generally, as shown in FIG. 7, a profile 101 is formed on the surface of a pair of calendar rolls 3a and 3b constituting the calendar head 3 (FIG. 6). Since the rubber strip G2 is rolled and discharged in accordance with the profile 101, the rubber strip G2 thinner than the thickness of the profile 101 cannot be manufactured, and the minimum thickness t2 of the rubber strip G2 is 1 mm. Stayed in.

  As a result, when sticking to the forming drum, a thick rubber strip is stuck. As shown in FIG. 8, in the case of the rubber strip having a thickness t2 of 1 mm, the overlap thickness t4 is the maximum. It becomes 2 mm and cannot be controlled below that. Thus, in the rubber strip G2 manufactured using the conventional rubber strip manufacturing apparatus, it was not possible to ensure a sufficient degree of freedom in controlling the thickness at the overlapping portion of the rubber strip G2.

  Further, since only one rubber strip is discharged from the calendar head, it takes a long time to produce a rubber strip having a required length, resulting in a decrease in productivity.

  In addition, the manufactured rubber strip is wound on a reel, but the maximum winding diameter at that time is fixed to a predetermined value, so the rubber strip cannot be wound sufficiently long and productivity is improved. It was difficult to plan.

  Therefore, the present invention can simultaneously manufacture a plurality of rubber strips thinner than the conventional one, and further, the obtained rubber strip can be wound on a reel long enough to improve productivity. It is an object of the present invention to provide an apparatus for manufacturing a rubber strip.

  The inventor has intensively studied and found that the above-described problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A rubber extruder that continuously discharges rubber from the discharge port;
A calender head having a pair of upper and lower calender rolls arranged in the vicinity of the discharge port to roll and discharge the discharged rubber to form a belt-shaped rubber strip;
An apparatus for manufacturing a rubber strip, which is provided on the downstream side of the calendar head and includes a winding unit having a reel for winding the rubber strip;
The rubber extruder die plate is formed to discharge a plurality of rubber from the discharge port,
The surfaces of the pair of upper and lower calendar rolls are formed in a flat shape not provided with a profile ,
In the rubber strip manufacturing apparatus, the winding unit is configured to wind up the rubber strip while performing a traverse operation.

The invention described in claim 2
2. The rubber strip manufacturing apparatus according to claim 1, wherein a gap between the pair of upper and lower calendar rolls can be adjusted to be less than 1 mm and 0.5 mm or more.

  According to the present invention, it is possible to simultaneously manufacture a plurality of rubber strips thinner than the conventional one, and further, the obtained rubber strip can be wound on a reel sufficiently long, thereby improving productivity. An apparatus for manufacturing a rubber strip can be provided.

It is a side view which shows the outline | summary of the manufacturing apparatus of the rubber strip which concerns on one embodiment of this invention. It is sectional drawing (a) which shows the shape of the rubber strip manufactured using the manufacturing apparatus of the rubber strip which concerns on one embodiment of this invention, the side view (b) and front view (c) of a calendar roll. Sectional drawing (a) which shows the shape of the rubber strip manufactured using the manufacturing apparatus of the rubber strip which concerns on one embodiment of this invention, (c), and the overlap part when these rubber strips are affixed It is sectional drawing (b) which shows the mode of (d). It is a side view which shows the winding-up part of the manufacturing apparatus of the rubber strip which concerns on one embodiment of this invention. It is a figure explaining the traverse operation | movement in the winding-up part of the manufacturing apparatus of the rubber strip which concerns on one embodiment of this invention. It is a side view which shows the outline | summary of the manufacturing apparatus of the conventional rubber strip. It is sectional drawing (a) which shows the shape of the rubber strip manufactured using the manufacturing apparatus of the conventional rubber strip, the side view (b) of a calender roll, and a front view (c). It is sectional drawing (a) which shows the shape of the rubber strip manufactured using the manufacturing apparatus of the conventional rubber strip, and sectional drawing (b) which shows an overlap part when a rubber strip is affixed.

  As described above, in the conventional rubber strip manufacturing apparatus, a profile is formed on the surface of the upper roll of a pair of calender rolls constituting the calender head, and rolling and discharging according to this profile, Rubber strips were being manufactured.

  However, as a result of diligent study by the present inventor, it has been found that by using a flat roll having no profile and reducing the roll interval, a thin rubber strip having a certain thickness or less can be easily manufactured without any trouble. It was. Also, in this case, it was found that a plurality of rubber strips can be easily manufactured at the same time, thereby completing the present invention.

  That is, by manufacturing a rubber strip using a roll having no profile as described above, a thin rubber strip having a thickness of less than 1 mm that could not be manufactured conventionally can be easily manufactured. And when this rubber strip is affixed on a forming drum and it overlaps | superimposes, the freedom degree of control of the overlapping thickness of a rubber strip can fully be ensured. Moreover, the productivity of a rubber strip is improved by simultaneously manufacturing a plurality of rubber strips.

  Further, when winding the rubber strip, the reel is wound while being traversed, so that it is possible to wind longer than the conventional one, and the productivity of the rubber strip is further improved.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a side view showing an outline of a rubber strip manufacturing apparatus according to the present embodiment. As shown in FIG. 1, a rubber strip manufacturing apparatus 1 according to this embodiment is similar to a conventional rubber strip manufacturing apparatus in that an extruder 2, a calendar head 3, a composite section 4, and a festoon section 5 are provided. And a winding unit 6 including a reel R.

  The extruder 2 includes, for example, a cylinder 2b provided at one end with an inlet 2a into which unvulcanized material rubber and various compounding agents are charged, a screw shaft 2c housed therein and driven to rotate, A die plate 2d serving as a discharge port for discharging the unvulcanized rubber extruded by the screw shaft 2c to the outside as a rubber molded body G1 having a substantially horizontally long cross section is provided. Unlike the conventional die plate, the die plate 2d of the present embodiment is formed so that a plurality of rubbers can be discharged.

  Thus, a plurality of rubber molded bodies G1 can be discharged from the extruder 2 and sent out to the calendar head 3.

  Specifically, for example, by providing two discharge openings of the die plate, the rubber supplied to the die plate can be dispersed and discharged from the extruder into two, so the rubber strip 2 having the same shape This can be discharged simultaneously.

  The calendar head 3 includes a pair of upper and lower calendar rolls 3a and 3b, and the surface thereof is formed in a flat shape having no profile unlike a calendar head in a conventional rubber strip manufacturing apparatus.

  When the plurality of rubber molded bodies G1 discharged from the extruder 2 are fed to the calendar head 3, they are rolled and discharged by passing through the gaps between the calendar rolls 3a and 3b, and processed into a rubber strip G2.

  At this time, as described above, since the surfaces of the calendar rolls 3a and 3b are formed in a flat shape, as shown in FIG. 2, the flat roll sheet is thin with a thickness corresponding to the gap D between the calendar rolls 3a and 3b. The rubber strip G2, specifically, the rubber strip G2 having a minimum thickness of 0.5 mm can be formed. FIG. 2 is a cross-sectional view (a) showing the shape of a rubber strip manufactured using the rubber strip manufacturing apparatus according to the present embodiment, a side view (b), and a front view (c) of a calendar roll. It is. And the thickness t1 and the width W1 of the rubber strip G2 can be appropriately adjusted by adjusting the rubber discharge shape according to the shape of the die plate. Thereby, a plurality of appropriate rubber strips G2 can be processed simultaneously.

  When the rubber strip having such a thickness is used for pasting to the forming drum, for example, when the thickness t1 is 0.5 mm, the thickness t3 at the time of pasting can be 1 mm (FIG. 3). (See (a) and (b)). Moreover, when thickness t1 is set to 0.6 mm, thickness t3 at the time of sticking can be 1.2 mm (refer FIG.3 (c) and (d)). Thus, by processing into a thin rubber strip, the overlapping thickness t3 of the rubber strip can be easily controlled.

  Returning to FIG. 1, the composite unit 4 includes a main body 4 a and a metal cooling drum C that is supported by the main body 4 a and cools the rubber strip G <b> 2. The rubber strip G2 cooled by the cooling drum C is bonded to the support 10 that is unwound from the reel 11 and supplied to be processed into a composite tape 12. Then, the support body 10 is cut into a width corresponding to the width of each rubber strip G2 by the cutter blade 13, thereby being cut into a plurality of composite tapes 12.

  The festoon portion 5 includes a main body 5 a and a plurality of rollers 5 b having a horizontal axis perpendicular to the longitudinal direction of the composite tape 12. The plurality of rollers 5b includes an upper roller 5b1 that is rotatably supported on the upper side of the main body 5a, and a lower roller 5b2 that is rotatably supported on the lower side of the main body 5a and is movable in synchronization with the upper and lower sides. And.

  The festoon portion 5 can temporarily hold the composite tape 12 by the lower roller 5b2 moving downward. Thereby, the festoon part 5 can absorb the composite tape 12 continuously supplied, for example, when the reel R is replaced. A plurality of sets of festoon portions 5 are also prepared in accordance with the number of rubber strips G2 (two sets in the figure).

  Next, FIG. 4 is a side view showing a winding portion of the rubber strip manufacturing apparatus according to the present embodiment. As shown in FIG. 4, the winding unit 6 includes a fixing unit 60, a rail 62 provided on the fixing unit 60, a pedestal 66 that moves on the rail 62, and a reel stand 63 that is fixed on the pedestal 66. And a reel R that is supported by the reel stand 63 and rotates, and a ball screw 64 for moving the pedestal 66 along the rail 62. In FIG. 4, reference numeral 65 denotes a guide roll for guiding the composite tape 12 to the reel R.

  The reel R is configured to wind up the composite tape 12 by reciprocating (traverse operation) on the rail 62 in a direction orthogonal to the rotation direction of the reel R in accordance with the rotation of the ball screw 64 at the time of rotation. FIG. 5 is a diagram for explaining the traverse operation in the winding unit of the rubber strip manufacturing apparatus according to the present embodiment.

  As shown in FIG. 5, the reel R is reciprocated in a direction perpendicular to the rotation direction of the reel R and is rotated by the motor 61, whereby the composite tape is wound around the reel R.

  By taking up the rubber strip G2 (composite tape 12) while performing the traverse operation using the wide reel R in this way, it is possible to take up the rubber strip G2 that is longer than the conventional one. In addition, 65 of FIG. 5 is a guide roll.

  As described above, when the rubber strip manufacturing apparatus according to the present embodiment is used, a thin rubber strip is manufactured, and the thin rubber strip is attached on the forming drum and overlapped, thereby overlapping the thickness of the rubber strip. Control becomes easy and a sufficient degree of freedom of control can be secured.

  Furthermore, by manufacturing using a roll not provided with a profile, a rubber strip member of BC (breaker cushion rubber) having a thickness of 1 mm or more, which has been conventionally manufactured using a roll not provided with a profile, Since it can be manufactured in the same way as rubber strip members of PEN (rubber for preventing static electricity accumulation) and rubber strips of cap (tread cap layer), rubber strips of various thicknesses can be manufactured with a high degree of freedom. It can be manufactured efficiently.

  In addition, since a plurality of rubber strips can be manufactured at the same time, productivity can be greatly improved.

  Further, since the rubber strip can be wound up in a long length, the number of times of changeover for exchanging the reel on which the rubber strip is wound can be greatly reduced, and the productivity is also greatly improved in this respect.

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

DESCRIPTION OF SYMBOLS 1 Rubber strip manufacturing apparatus 2 Extruder 2a Input port 2b Cylinder 2c Screw shaft 2d Die plate 3 Calendar head 3a, 3b Calendar roll 4 Composite part 4a, 5a, 6a Main body 5 Festoon part 5b Roller 5b1 Upper roller 5b2 Lower roller 6 Winding Take-up section 10 Support body 11, R reel 12 Composite tape 13 Cutter blade 60 Fixing section 61 Motor 62 Rail 63 Reel stand 64 Ball screw 65 Guide roll 66 Base 101 Profile C Cooling drum D Gap G1 Rubber molded body G2 Rubber strips t1 to t4 Thickness W1 width

Claims (2)

A rubber extruder that continuously discharges rubber from the discharge port;
A calender head having a pair of upper and lower calender rolls arranged in the vicinity of the discharge port to roll and discharge the discharged rubber to form a belt-shaped rubber strip;
An apparatus for manufacturing a rubber strip, which is provided on the downstream side of the calendar head and includes a winding unit having a reel for winding the rubber strip;
The rubber extruder die plate is formed to discharge a plurality of rubber from the discharge port,
The surfaces of the pair of upper and lower calendar rolls are formed in a flat shape not provided with a profile ,
The rubber strip manufacturing apparatus, wherein the winding unit is configured to wind up the rubber strip while traversing.   The rubber strip manufacturing apparatus according to claim 1, wherein a gap between the pair of upper and lower calendar rolls is adjustable to less than 1 mm and 0.5 mm or more.

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