JP6121218B2 - Raw tire molding apparatus and green tire molding method - Google Patents

Description

  The present invention relates to a green tire molding apparatus and a green tire molding method for molding a green tire by sticking a strip-shaped rubber member for a tire to a former drum.

  When forming a green tire, generally, a so-called strip-shaped rubber member for a tire (strip rubber) such as tread rubber, sidewall rubber, and inner liner rubber is attached to a former drum and spirally wound. A strip wind method is used (for example, Patent Document 1).

  Specifically, as shown in FIG. 5, the strip rubber G extruded from the extruder a is taken up by the conveying belt c1 of the take-up device c, and then passed through a festoon device and an applicator device (not shown), and then the former. A green tire is molded by being attached to a drum and wound.

  At this time, the take-up device c is provided with pressing rollers (A and B in FIG. 5). The pressing rollers A and B press the surface of the strip rubber G into close contact with the conveying belt c1, and the conveying belt c1. By transferring the surface state to the surface of the strip rubber G, the adhesiveness of the strip rubber G when the strip rubber G is wound is ensured.

JP 2007-136740 A

  On the other hand, in recent years, with the demand for lower fuel consumption of vehicles, tires are also strongly required to respond to lower fuel consumption, and accordingly, strip rubber with low fuel consumption is also used in strip rubber. ing.

  However, the strip rubber with low fuel consumption generally has low adhesiveness, so the above-mentioned conventional method cannot secure sufficient adhesiveness of the strip rubber. There was a risk that the strip rubber would fall.

  Accordingly, the present invention provides a raw tire molding apparatus and a raw tire that can secure and sufficiently stick to a former drum even when it is a low-fuel-consumption strip rubber with low stickiness and can be attached to a former drum and wound. It is an object to provide a method for forming a tire.

The invention described in claim 1
A strip forming tire rubber member extruded from an extruder is transported to a former drum by a transport belt, and a raw tire molding apparatus for molding a raw tire,
A pressing means for pressing the tire rubber member against the conveyor belt is provided opposite to the conveyor belt across the tire rubber member;
The pressing means is in surface contact with the transported rubber member for the tire and transfers the surface state of the transport belt to the surface of the tire rubber member in contact with the transport belt, and the surface of the pressing means. The state is configured to be transferred to the surface of the tire rubber member opposite to the surface in contact with the conveyor belt ,
The pressing means has a width that is substantially the same as the width of the conveyor belt, and moves the pressing belt that is stretched between rollers in the direction of the conveyor belt to press the rubber member for tire. Configured,
The green tire molding apparatus according to claim 1 , wherein the pressing unit includes a driving unit that adjusts a pressing force by appropriately adjusting an interval between the pressing belt and the conveying belt. .

The invention described in claim 2
A green tire molding method using the green tire molding apparatus according to claim 1,
A strip rubber production process for producing a strip-shaped rubber member for a tire by extruding a rubber composition of a predetermined composition from an extruder;
The tire rubber member is brought into surface contact with the tire rubber member by using a conveying belt and pressing means disposed at positions facing each other across the tire rubber member, and the tire rubber member is pressed on both sides of the tire rubber member. A transfer step for transferring the surface state of the belt and the pressing means;
A transfer step of peeling the transferred rubber member for tire from the pressing means and transferring the tire rubber member to a former drum using the transfer belt;
A raw tire comprising: a raw tire molding step of peeling the tire rubber member that has been transported from the transport belt, attaching the tire rubber member to the former drum, and winding the tire to form a raw tire This is a molding method.

The invention according to claim 3
3. The green tire molding method according to claim 2 , wherein the rubber composition is a rubber composition containing a low fuel consumption.

  According to the present invention, a raw tire molding apparatus and a raw tire that can secure and sufficiently adhere to a former drum even if it is a low-fuel-consumption strip rubber with low adhesiveness, and can be attached and wound on a former drum. A method for forming a tire can be provided.

1 is a diagram schematically showing a green tire molding apparatus according to an embodiment of the present invention. It is a figure which shows typically the press means of the shaping | molding apparatus of the raw tire which concerns on one embodiment of this invention. It is a figure which shows a test example. It is the perspective view and sectional drawing which show a test example. It is a figure which shows typically the shaping | molding apparatus of the conventional raw tire.

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

1. Raw Tire Molding Device FIG. 1 is a diagram schematically showing a green tire molding device according to the present embodiment. FIG. 2 is a diagram schematically showing the pressing means of the molding apparatus, where (a) is a front view and (b) is a side view.

(1) Molding Device As shown in FIG. 1, the green tire molding device 1 according to the present embodiment takes the tire rubber member (strip rubber) G extruded from the extruder a by the conveyor belt 2. It is configured to convey toward a downstream former drum (not shown). The green tire molding apparatus 1 includes a conveyor belt 2 that is stretched over a roller 2 a and a pressing unit 3 that presses the strip rubber G and presses it against the conveyor belt 2.

(2) Pressing means As shown in FIGS. 2 (a) and 2 (b), the pressing means 3 is constituted by a pressing belt 3b that is stretched over a plurality of rollers 3a and has substantially the same width as the conveying belt 2. A pressing member 3 c is provided, and the pressing member 3 c is disposed along the conveyor belt 2.

  The pressing unit 3 includes a driving unit 3j that moves the pressing member 3c toward the transport belt 2. The driving means 3j is composed of a cylinder, for example, and adjusts the pressing force by appropriately adjusting the distance between the pressing member 3c and the conveyor belt 2 by the extension and contraction of the cylinder. More detailed adjustment of the pressing force is performed by, for example, an adjustment mechanism including a screw rod 3g and a handle 3h.

  A receiving member 3k is disposed at a position facing the pressing member 3c via the transport belt 2.

  By pressing the strip rubber G against the conveyor belt 2 over the entire width using such pressing means 3, the surface state of the conveyor belt 2 is transferred to the surface of the strip rubber G that contacts the conveyor belt 2, and The surface state of the pressing belt 3b is transferred to the surface of the strip rubber G that contacts the pressing belt 3b (that is, the surface opposite to the surface that contacts the conveying belt 2).

  The conveying belt 2 and the pressing belt 3b can be appropriately selected according to the adhesion required for the strip rubber G at the time of sticking to the former drum and winding, but generally the same material, It is preferable to use a belt with less irregularities on both surfaces.

  As a result, both surfaces of the strip rubber G are brought into surface contact by the entire surface being pressed by the conveyor belt 2 and the pressing belt 3b, and the surface state is transferred. Therefore, when the front and back surfaces of the strip rubber G are overlapped , Sufficient adhesive strength can be ensured.

  In the above description, the pressing member 3c is configured by using the pressing belt 3b. However, the configuration is not limited as long as both surfaces of the strip rubber G can be pressed on the entire surface.

  And since installation of such a pressing means does not require the large remodeling of the conventional shaping | molding apparatus, generation | occurrence | production of a new cost can fully be suppressed.

2. Next, a green tire molding method using the green tire molding apparatus 1 described above will be described.

(1) Transfer process First, the front end of the strip rubber G extruded from the extruder a is positioned on the conveyor belt 2, and the strip rubber G is drawn toward the former drum. At this time, the pressing member 3c is raised by the extension of the cylinder of the driving means 3j, and the strip rubber G is pressed against the transport belt 2 by the pressing member 3c. The conveyor belt 2 is received by a receiving member 3k.

  As described above, since the conveyance belt 2 and the pressing belt 3b are set to have substantially the same width, the both sides of the strip rubber G sandwiched between the conveyance belt 2 and the pressing belt 3b are pressed in a surface contact state.

  As a result, the surface of the strip rubber G that is not in contact with the conveyor belt 2 is different from the conventional one in which the surface state of the pressing roller is transferred only in a linear manner on the surface that does not contact the conveyor belt 2 of the strip rubber G. The surface state is transferred by surface contact by 3b. As a result, the unevenness on the surface of the strip rubber G can be reduced, and sufficient adhesiveness can be secured on both sides of the strip rubber G.

(2) Conveying Step Next, the cylinder of the driving means 3j is retracted to separate the pressing member 3c from the upper surface of the strip rubber G (the surface not in contact with the conveying belt 2), and the conveying belt is directed toward the former drum. The strip rubber G is conveyed. At this time, the upper surface of the strip rubber G maintains the transferred surface state.

(3) Raw Tire Molding Step Next, the strip rubber G that has been transported to the former drum is peeled off from the transport belt, attached to the former drum, and wound to form a raw tire.

  At this time, as described above, each of the surface states of the transport belt 2 and the pressing belt 3b is transferred to the both sides of the strip rubber G, and sufficient adhesiveness is secured. Without inviting, the green rubber can be molded by attaching and winding the strip rubber G.

  Specifically, as in the past, the adhesive strength on the back of the strip rubber G remains at 1.0 N with respect to the adhesive strength of 1.5 N on the front surface of the strip rubber G. Compared to the fact that sufficient adhesive strength could not be secured, in the present embodiment, both surfaces of the strip rubber G show a high adhesive strength of 1.5 N or more. Sufficient adhesive strength can be ensured.

  Further, in the present embodiment, since the adhesiveness on both sides of the strip rubber G is improved by pressing using the pressing member 3c having substantially the same width as the conveying belt 2, an excessive pressing force is applied during pressing. There is no need. For this reason, the strip rubber G can be peeled from the conveyor belt 3b in an attempt to secure sufficient adhesive force by applying an excessive pressing force to improve the adhesiveness of the surface contacting the conveyor belt 2 as in the prior art. It will not disappear.

[Experimental example]
Hereinafter, the present invention will be described more specifically based on experimental examples.

  First, Experimental Examples 1 and 2 shown below were conducted as a preliminary experiment for examining an improvement in adhesive force by pressing both surfaces of the strip rubber G over the entire surface.

(Experimental example 1)
A belt-like belt T (manufactured by Habasit Co., Ltd .: Model No. T07 BLUE) is wound around the pressure roller A of a conventional green tire molding apparatus as shown in FIG. The test rubber of Experimental Example 1 was manufactured by pressing a low fuel consumption strip rubber (width 30 mm, thickness 0.7 mm) conveyed to c1.

(Experimental example 2)
For comparison, a test body of Experimental Example 2 was manufactured in the same manner as in Experimental Example 1 except that the belt-like belt T was not wound around the pressing roller A.

  Next, the adhesive strength of both surfaces of each obtained specimen was measured using a general-purpose tack meter. The measurement conditions are a compression load of 500 g, a measurement speed of 10 mm / sec, and a pressure bonding time of 10 seconds.

  As a result of the measurement, the adhesive strength on the back surface was almost the same value as about 2.2 N in all the test bodies. However, the adhesive strength of the surface was 2.0 N in the test body of Experimental Example 1, whereas it remained at 1.0 N or less in the test body of Experimental Example 2. From this result, it was confirmed that the adhesive strength of the surface was improved by pressing both sides of the strip rubber with the belt-like rubber.

(Experimental example 3)
Based on the above results, next, as shown in FIGS. 4 (a) and 4 (b), a strip rubber with low fuel consumption immediately after extrusion is sandwiched between the belt belts T and fixed with tape, as shown in FIG. A test body of Experimental Example 3 was manufactured by pressing with a pressing roller B of a conventional green tire molding apparatus.

  About the produced test body, when the adhesive force of the surface was measured similarly to the above, it turned out that it is 0.8N compared with the measurement result in Experimental example 1 with 2.8N. From this result, it was confirmed that the adhesive strength could be further improved by pressing the strip rubber immediately after extrusion with the surface and transferring the surface of the belt-like rubber to the surface.

(Experimental example 4)
Next, using the green tire molding apparatus 1 according to the above-described embodiment shown in FIG. 1, the pressing means 3 is constituted by the same belt-like belt T as described above, and the test specimen of Experimental Example 4 is made from a strip rubber with low fuel consumption. Was made.

(Experimental example 5)
A test body of Experimental Example 5 was produced in the same manner as Experimental Example 4 except that it was a strip rubber of a conventional rubber composition for tires.

  When the adhesive strength of the surface of each test specimen prepared was measured in the same manner as described above, the adhesive strength of the test specimen of Experimental Example 4 was 2.9 N, which was further improved than that of Experimental Example 3. In the test body of Experimental Example 5, the adhesive strength was 4.3 N, which was higher than that of Experimental Example 2. As a result, by using the raw tire molding apparatus according to the present invention, sufficient adhesive strength can be ensured not only for the tire rubber of the conventional blend but also for the tire rubber of the low fuel consumption blend. It could be confirmed.

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

DESCRIPTION OF SYMBOLS 1, c Raw tire molding device 2, c1 Conveying belt 2a, 3a Roller 3 Pressing means 3b Pressing belt 3c Pressing member 3j Driving means 3g Screw rod 3h Handle 3k Receiving member a Extruder b Calender roll machine A, B Pressing roller G Strip rubber T Belt belt T

Claims (3)

A strip forming tire rubber member extruded from an extruder is transported to a former drum by a transport belt, and a raw tire molding apparatus for molding a raw tire,
A pressing means for pressing the tire rubber member against the conveyor belt is provided opposite to the conveyor belt across the tire rubber member;
The pressing means is in surface contact with the transported rubber member for the tire and transfers the surface state of the transport belt to the surface of the tire rubber member in contact with the transport belt, and the surface of the pressing means. The state is configured to be transferred to the surface of the tire rubber member opposite to the surface in contact with the conveyor belt ,
The pressing means has a width that is substantially the same as the width of the conveyor belt, and moves the pressing belt that is stretched between rollers in the direction of the conveyor belt to press the rubber member for tire. Configured,
The green tire molding apparatus according to claim 1 , wherein the pressing unit includes a driving unit that adjusts a pressing force by appropriately adjusting an interval between the pressing belt and the conveying belt . A green tire molding method using the green tire molding apparatus according to claim 1,
A strip rubber production process for producing a strip-shaped rubber member for a tire by extruding a rubber composition of a predetermined composition from an extruder;
The tire rubber member is brought into surface contact with the tire rubber member by using a conveying belt and pressing means disposed at positions facing each other across the tire rubber member, and the tire rubber member is pressed on both sides of the tire rubber member. A transfer step for transferring the surface state of the belt and the pressing means;
A transfer step of peeling the transferred rubber member for tire from the pressing means and transferring the tire rubber member to a former drum using the transfer belt;
A raw tire comprising: a raw tire molding step of peeling the tire rubber member that has been transported from the transport belt, attaching the tire rubber member to the former drum, and winding the tire to form a raw tire Molding method. 3. The green tire molding method according to claim 2 , wherein the rubber composition is a rubber composition with a low fuel consumption.

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