Stencil plate, its manufacturing method, and tire vulcanization mold

Abstract

To facilitate identification of a front and back of a stencil plate to prevent erroneous attachment to a tire vulcanization mold.SOLUTION: There is provided a stencil plate 20 mounted in a mounting recess 22 provided on a tire molding surface 12 of a tire vulcanization mold 10 to form a tire identification mark on an outer surface of a tire. The stencil plate 20 comprises: a surface 28 that contacts the outer surface of the tire during tire molding; a back surface 30 facing a side of a mounting recess 22 during tire molding; a mark forming part 32 for forming a tire identification mark on the outer surface of the tire; and a front / back identification mark 34 provided on the back surface 30 without appearing on the front surface 28 for identifying the front and back of the stencil plate 20.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] An embodiment of the present invention relates to a stencil plate for forming a tire identification mark on the outer surface of a tire, a method for manufacturing the same, and a tire vulcanization mold including the stencil plate. [Background technology]

[0002] On the outer surface of a pneumatic tire, a tire identification mark such as a letter, symbol, or figure is provided to facilitate identification of the tire manufacturer, type, size, year and week of manufacture, etc. In order to form such a tire identification mark, it is known to replaceably attach a stencil plate made of a metal plate such as aluminum or iron to the tire molding surface of a vulcanization mold (see Patent Documents 1 to 3).

[0003] Conventionally, tire identification marks have been formed in a concave shape on the outer surface of a tire, but in recent years, there has been a demand for tire identification marks to be formed in a convex shape. In order to form a convex tire identification mark, it is necessary to reverse the concave and convex shapes provided on the stencil plate from the conventional case, and a stencil plate has been proposed in which recesses for forming tire identification marks are provided on the surface by embossing a metal plate (see Patent Document 4). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-001224 A [Patent Document 2] JP 2015-051605 A [Patent Document 3] JP 2007-038528 A [Patent Document 4] JP 2020-151915 A Summary of the Invention [Problem to be solved by the invention]

[0005] If the projections and recesses on the stencil plate are set inversely to those of the conventional method as described above, the worker may mistakenly mount the stencil plate upside down when mounting it on the tire vulcanization mold, and if the plate is mounted upside down, the correct tire identification mark cannot be molded. If the stencil plate has countersunk recesses at both ends to receive the heads of the flathead screws for fastening the plate to the tire vulcanization mold, as in the stencil plate described in Patent Document 4, the countersunk recesses make it relatively easy to distinguish the front from the back by sight and touch. However, with a stencil plate without countersunk recesses, it becomes even more difficult for the worker to distinguish the front from the back.

[0006] In view of the above, an embodiment of the present invention aims to make it easy to distinguish between the front and back of a stencil plate and prevent incorrect installation into a tire vulcanization mold. [Means for solving the problem]

[0007] A stencil plate according to an embodiment of the present invention is a stencil plate that is attached to an attachment recess provided on a tire molding surface of a tire vulcanization mold and is used to form a tire identification mark on a tire outer surface, and includes a surface that contacts the tire outer surface during tire molding, a back surface that faces the attachment recess side during tire molding, a mark forming portion for forming the tire identification mark on the tire outer surface, and a front / back identification mark that is provided on the back surface and does not appear on the front surface, for identifying the front and back of the stencil plate. The front / rear identification mark extends in the longitudinal direction of the stencil plate. It is something.

[0008] The front / back identification mark may include a recess provided on the back surface, the recess not reaching the front surface. The recess may be formed by scratching, knurling, or shot blasting the back surface.

[0009] The front / back identification mark may include a colored portion having a color different from that of the front side. The colored portion may be a line drawn with an oil-based marker. The colored portion may be a painted portion.

[0011] The front / back identification mark may be formed by applying a color different from that of the front surface to a recess provided on the back surface that does not reach the front surface.

[0012] The mark forming portion may be a recess for forming a protruding tire identification mark on the outer surface of the tire, and a protrusion corresponding to the recess may be provided on the back surface.

[0013] A tire vulcanizing mold according to an embodiment of the present invention comprises a tire molding surface, a mounting recess provided on the tire molding surface, and the stencil plate mounted in the mounting recess.

[0014] A method for manufacturing a stencil plate according to an embodiment for manufacturing the stencil plate includes forming the front / back identification mark on a surface of a metal plate corresponding to the back surface, embossing the metal plate with the front / back identification mark to form the mark forming portion, and cutting the metal plate with the mark forming portion to the outer shape of the stencil plate. Effect of the Invention

[0015] In this embodiment, by providing a front / back identification mark, it is possible to distinguish between the front and back of the stencil plate, and it is possible to prevent incorrect installation into the tire vulcanization mold. The front / back identification mark does not appear on the front side of the stencil plate, so it does not affect the outer surface of the tire. On the other hand, if the stencil plate is incorrectly installed, the front / back identification mark appears when looking at the tire molding surface, so the operator can be notified of the incorrect installation. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a half cross-sectional view showing a state during vulcanization of a tire vulcanization mold according to an embodiment. [Diagram 2] X-arrow view of Figure 1 [Diagram 3] Cross-sectional view of line III-III in Figure 2 [Figure 4] FIG. 1 is a plan view showing the rear surface of a stencil plate according to a first embodiment; [Diagram 5] Cross-sectional view of line VV in Figure 4 [Figure 6] FIG. 13 is a plan view showing the rear surface of a stencil plate according to the third embodiment; [Figure 7] FIG. 13 is a plan view showing the rear surface of a stencil plate according to the fifth embodiment; [Figure 8] 13 is a cross-sectional view of a stencil plate according to a sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment will be described with reference to the drawings.

[0018] [First embodiment] FIG. 1 is a diagram showing a tire vulcanization mold (hereinafter, sometimes simply referred to as a mold) 10 according to one embodiment, which is used to vulcanize and mold a pneumatic tire (hereinafter, sometimes simply referred to as a tire). Here, the pneumatic tire T is configured to include a tread T1 forming a ground contact surface, a pair of sidewalls T2, T2 and beads T3, T3 extending radially inward from both ends of the tread T1 in the width direction, and can adopt a general tire structure except for a tire identification mark provided on a side portion T4. Here, the side portion T4 is a concept that encompasses the sidewall T2 and the bead T3.

[0019] The mold 10 has a tire molding surface 12 that molds the outer surface of the tire T, and vulcanizes and molds an unvulcanized green tire set in the cavity. The mold 10 has a tread mold 14 having a tread molding surface 14A that molds the outer surface of the tread T1, a pair of upper and lower sidewall molds 16, 16 having sidewall molding surfaces 16A that mold the outer surfaces of the sidewalls T2, and a pair of upper and lower bead molds 18, 18 having bead molding surfaces 18A that mold the outer surfaces of the beads T3, and forms a cavity that is a molding space for the tire T.

[0020] The tire molding surface 12 is provided with a mounting recess 22 for mounting the stencil plate 20. In this example, the mounting recess 22 is provided in a side molding surface 12A of the tire molding surface 12 that molds the side portion T4. Here, the side molding surface 12A is a concept that encompasses the sidewall molding surface 16A and the bead molding surface 18A. In FIG. 1, the mounting recess 22 is provided in the sidewall molding surface 16A, but it may be provided in the bead molding surface 18A, or may be provided in both the sidewall molding surface 16A and the bead molding surface 18A.

[0021] The mounting recess 22 is formed by locally depressing the tire molding surface 12, and is a recessed groove that extends in a curved manner along the tire circumferential direction CD as shown in Fig. 2. Therefore, the mounting recess 22 has a horizontally elongated shape whose length in the tire circumferential direction CD is greater than its width in the tire radial direction RD. The depth of the mounting recess 22 is not particularly limited, and may be, for example, 0.8 to 1.8 mm, or 1.0 to 1.5 mm.

[0022] The stencil plate 20 is a plate for forming a tire identification mark on the outer surface of the tire T, and is fitted and attached in the mounting recess 22. In this example, the stencil plate 20 is a member for forming a convex tire identification mark on the outer surface of the side portion T4, and is made of a horizontally long metal plate whose length L in the tire circumferential direction CD is greater than its width W in the tire radial direction RD (see FIG. 4). The stencil plate 20 is a long and thin strip-shaped member that extends while curving along the tire circumferential direction CD. The thickness t1 (see FIG. 3) of the metal plate is not particularly limited and may be, for example, 0.2 to 0.8 mm, or 0.3 to 0.6 mm.

[0023] The stencil plate 20 is mounted in the mounting recess 22 via a spacer member 24 attached to the mounting recess 22. The spacer member 24 is a raising portion for raising the height of a part of the bottom surface of the mounting recess 22 as shown in Fig. 3, and is provided so as to support the peripheral portion of the stencil plate 20 and the periphery of a screw hole 35 described later as shown in Figs. 2 and 3. The spacer member 24 is attached in the mounting recess 22, the stencil plate 20 is attached thereon, and the screws 26 are fastened at both ends in the longitudinal direction LD, whereby the stencil plate 20 is fixed in the mounting recess 22. The bottom surface of the mounting recess 22 is provided with mounting holes 27 into which the screws 26 are screwed.

[0024] The stencil plate 20 has a front surface 28 that contacts the outer surface of the tire when the tire is molded, a back surface 30 that faces the mounting recess 22 when the tire is molded, a mark forming portion 32 for forming a tire identification mark on the outer surface of the tire, and a front / back identification mark 34 (see FIG. 4) for identifying the front and back of the stencil plate 20. The stencil plate 20 also has screw holes 35 at both ends in the longitudinal direction LD.

[0025] The front surface 28 is the surface, of both the front and back surfaces of the plate-shaped stencil plate 20, that faces the cavity when the stencil plate 20 is attached to the mold 10, and is the upper surface in Fig. 3. The back surface 30 is the surface, of both the front and back surfaces of the plate-shaped stencil plate 20, that faces the bottom side of the attachment recess 22 when the stencil plate 20 is attached to the mold 10, and is the lower surface in Fig. 3.

[0026] In this example, the mark forming portion 32 is configured with a recess 36 for forming a protruding tire identification mark on the outer surface of the tire, and is formed by depressing the surface 28 by embossing. That is, the recess 36 is provided on the surface 28 side of the stencil plate 20. The depth D1 of the recess 36 from the surface 28 is not particularly limited and may be, for example, 0.3 to 1.2 mm.

[0027] By forming the recesses 36, protrusions 38 corresponding to the recesses 36 are formed on the back surface 30 of the stencil plate 20. That is, the protrusions 38 are the recesses 36 as viewed from the back surface 30 of the stencil plate 20, and therefore the protruding height thereof is substantially the same as the depth of the recesses 36.

[0028] In this example, a plurality of recesses 36 are provided in the longitudinal direction LD of the stencil plate 20, and a tire identification mark is formed on the outer surface of the tire by the plurality of recesses 36. As shown in FIG. 2, the recesses 36 have a shape that is an inversion of the tire identification mark formed on the outer surface of the tire. Examples of the tire identification mark include characters, symbols, and figures that indicate the tire manufacturer, type, size, serial number, and date of manufacture. In the example of FIG. 2, the character string "HLD5011" is used as the tire identification mark, and the recesses 36 are formed in a shape that is an inversion of this. Therefore, when the stencil plate 20 is viewed from the back surface 30 as shown in FIG. 4, the protrusions 38 are formed in the same shape as the tire identification mark.

[0029] The front / back identification mark 34 is provided on the back surface 30 of the stencil plate 20 without appearing on the front surface 28. In this example, as shown in Figures 4 and 5, the front / back identification mark 34 is a recess 40 provided on the back surface 30 of the stencil plate 20 that does not reach the front surface 28, and extends in the longitudinal direction LD of the stencil plate 20.

[0030] The recess 40 is formed by scratching the back surface 30 of the stencil plate 20, for example, by a marking needle (i.e., a marking line), and the recess 40 consisting of a single continuous marking line is formed along the longitudinal direction LD of the stencil plate 20. The depth of the recess 40 is not particularly limited as long as it does not reach the front surface 28, but since it is a marking line, it is usually sufficiently smaller than the thickness of the stencil plate 20.

[0031] The stencil plate 20 can be manufactured as follows. (1) A front / back identification mark 34 is formed on a surface corresponding to the back surface 30 using a metal plate. (2) The metal plate having the front and back discrimination marks 34 is embossed to form the mark forming portion 32. (3) The metal plate provided with the mark forming portion 32 is cut into the outer shape of the stencil plate 20.

[0032] In step (1), a long (strip-shaped) metal plate is unwound from a roll of the metal plate, and a marking needle is pressed against one side of the unwound metal plate. That is, the metal plate is fed to a position where the marking needle is fixed. This allows a marking line (a depression 40 corresponding to the front / back identification mark 34) to be formed on one side of the metal plate. After the marking line is formed, in step (2), an embossing die is pressed against the surface of the metal plate corresponding to the above-mentioned front surface 28 (the surface opposite to the surface on which the marking line is formed) to form a depression 36 of the mark forming portion 32. Next, in step (3), the metal plate is punched into a predetermined shape to obtain a stencil plate 20.

[0033] When attaching the stencil plate 20 to the mounting recess 22, a spacer member 24 is attached within the mounting recess 22 of the mold 10, and then the stencil plate 20 is set within the mounting recess 22 and the screws 26 are inserted into the screw holes 35 and screwed into the mounting holes 27 to fix the stencil plate 20.

[0034] When manufacturing a tire T using the mold 10 configured as above, a green tire is set in the mold 10 and closed, and then a bladder (not shown) arranged on the inside is inflated to press the green tire against the inner surface of the mold and maintain it in a heated state. This causes the green tire to be vulcanized and molded, and a tire T is obtained. In the tire T obtained, a tire identification mark is formed on the outer surface of the side portion T4 in a convex shape protruding from the outer surface of the tire. The green tire can be manufactured using a known method.

[0035] In this embodiment, by providing the stencil plate 20 with the front / back identification mark 34, the front and back of the stencil plate 20 can be identified even though the stencil plate 20 is not countersunk, and erroneous attachment to the mold 10 can be prevented. The front / back identification mark 34 is a recess 40 provided on the back surface 30 of the stencil plate 20 that does not reach the front surface 28, and is not visible on the front surface 28, so it does not affect the outer surface of the tire T to be molded. On the other hand, if the stencil plate 20 is attached upside down in the attachment recess 22, the front / back identification mark 34 will appear when the tire molding surface 12 is viewed, and the worker can be notified of the erroneous attachment.

[0036] In the first embodiment, the front / back identification mark 34 is a linear depression 40 that is a single marking line, but a plurality of marking lines may be provided. In addition, in FIG. 4, the linear depression 40 that is a marking line is shown as a continuous straight line in the entire longitudinal direction LD of the stencil plate 20, but it may be formed in a part of the longitudinal direction LD or may be formed intermittently. For example, when the mark forming portion 32 is provided by embossing after forming the marking line as described above, the depression 40 of the marking line may become shallow or disappear due to plastic deformation in the portion where the convex portion 38 of the back surface 30 is provided, so that the marking line may be formed intermittently. In addition, the depression 40 by the marking line is not limited to a form extending in the longitudinal direction LD, and may be provided to extend, for example, in the width direction of the stencil plate 20.

[0037] [Second embodiment] In the first embodiment, the front / back identification mark 34 is formed by scratches made with a marking needle, but the method of making such scratches is not limited to a marking needle. As another example, in the second embodiment, a large number of scratches are made on the back surface 30 of the stencil plate 20 with a grindstone having coarse abrasive grains such as a diamond grindstone.

[0038] In this case, in the above step (1), by pressing a grindstone against one side of the unwound metal plate, a large number of scratches can be formed as front / back identification marks 34 on the surface of the metal plate corresponding to the back surface 30.

[0039] The other configurations and effects of the second embodiment are the same as those of the first embodiment, and therefore a description thereof will be omitted.

[0040] [Third embodiment] 6 is a plan view showing the rear surface 30 of the stencil plate 20A according to the third embodiment. In the third embodiment, the front / back identification mark 34 provided on the rear surface 30 of the stencil plate 20A is a depression 40A formed by knurling, which is different from the first embodiment in that the front / back identification mark 34 is a scratch made by a marking needle.

[0041] The depressions 40A are depressions provided on the back surface 30 side of the stencil plate 20A that do not reach the front surface 28, similar to the depressions 40 in the first embodiment, and a knurling tool is pressed against the back surface 30 of the stencil plate 20A, whereby a concave-convex pattern is rolled on the back surface 30 by plastic deformation. Examples of the knurling tool include, but are not limited to, oblique knurling, flat knurling, and twill knurling.

[0042] 6, the knurled recesses 40A are provided extending in the longitudinal direction LD of the stencil plate 20A as in the first embodiment, but may extend in the width direction. Also, the knurled processing may be applied to the entire back surface 30.

[0043] When manufacturing the stencil plate 20A of the third embodiment, as in the first embodiment, in the above-mentioned step (1), a knurling tool is pressed against one side of the unrolled metal plate, so that a knurled pattern can be formed as a front / back identification mark 34 on the surface of the metal plate corresponding to the back surface 30.

[0044] The other configurations and effects of the third embodiment are the same as those of the first embodiment, and therefore a description thereof will be omitted.

[0045] [Fourth embodiment] In the first to third embodiments, the depressions 40, 40A that do not reach the front surface 28 are provided on the back surface 30 as the front / back identification mark 34. Such depressions that do not reach the front surface 28 are not limited to those formed by the above-mentioned scratches or knurling. As another example, in the fourth embodiment, depressions that do not reach the front surface 28 are formed on the back surface 30 of the stencil plate 20 by shot blasting (graining treatment).

[0046] Shot blasting is a technique in which granules called blasting material are collided with a workpiece, and an example of this is sand blasting. By performing shot blasting on the surface corresponding to the back surface 30 of the metal plate, a large number of minute dents can be formed as front / back identification marks 34 on the back surface 30 of the stencil plate 20 by plastic deformation. The front / back identification marks 34 may be formed on the entire back surface 30 of the stencil plate by shot blasting. Shot blasting may be performed before cutting the metal plate into a long shape, and the metal plate may be cut into a long shape after forming minute dents by sandblasting, and then the above steps (2) and (3) may be performed to manufacture the stencil plate 20.

[0047] The other configurations and effects of the fourth embodiment are the same as those of the first embodiment, and therefore a description thereof will be omitted.

[0048] [Fifth embodiment] 7 is a plan view showing the rear surface 30 of the stencil plate 20B according to the fifth embodiment. In the fifth embodiment, the front / back identification mark 34 provided on the rear surface 30 of the stencil plate 20B is a colored portion 42 that is a different color from the front surface 28, which is different from the depression 40 in the first embodiment.

[0049] That is, in the fifth embodiment, a colored portion 42 is provided on the back surface 30 of the stencil plate 20B as the front / back identification mark 34. In this example, the colored portion 42 is a line drawn with an oil-based marker (also called a felt-tip pen or an oil-based pen) and is provided extending in the longitudinal direction LD of the stencil plate 20B. Therefore, the colored portion 42 drawn with the oil-based marker is formed in a part of the back surface 30 in a color different from that of the other part of the back surface 30.

[0050] The color of the colored portion 42 is preferably a color that contrasts with the base material of the metal plate in order to improve visibility in a dark place, and examples of the color include red, pink, purple, orange, black, blue, green, brown, etc. Also, an oil-based fluorescent marker having a fluorescent color may be used.

[0051] When manufacturing the stencil plate 20B according to the fifth embodiment, in the above step (1) in the first embodiment, a metal plate is fed onto the fixed oil-based marker, and a line is drawn on one side of the metal plate with the oil-based marker. As a result, a colored portion 42 with the oil-based marker is formed on the surface corresponding to the back surface 30 as a front / back identification mark 34. Thereafter, in step (2), an embossing mold is pressed against the surface opposite to the surface on which the colored portion 42 is applied, to form a depression 36 in the mark forming portion 32, and then, in step (3), the metal plate is punched into a predetermined shape to obtain the stencil plate 20B.

[0052] In the fifth embodiment, by providing a contrasting color as the colored portion 42, it is possible to improve visibility in a dark place and to further facilitate identification of the front and back of the stencil plate 20B. The other configurations and effects of the fifth embodiment are the same as those of the first embodiment, and therefore a description thereof will be omitted.

[0053] In the fifth embodiment, the front / back identification mark 34 is the colored portion 42, which is a line made with a single oil-based marker, but a plurality of lines made with an oil-based marker may be provided. In addition, in FIG. 7, the colored portion 42 is shown as a continuous straight line in the entire longitudinal direction LD of the stencil plate 20B, but it may be formed in a part of the longitudinal direction LD or may be formed intermittently. For example, when the mark forming portion 32 is provided by embossing after forming the colored portion 42 as described above, the colored portion 42 may become thin or disappear in the portion where the convex portion 38 of the back surface 30 is provided, and therefore the colored portion 42 may be formed intermittently. In addition, the colored portion 42 made with an oil-based marker is not limited to a form extending in the longitudinal direction LD, and may be provided, for example, extending in the width direction of the stencil plate 20.

[0054] [Sixth embodiment] 8 is a cross-sectional view of a stencil plate 20C according to a sixth embodiment. The sixth embodiment differs from the fifth embodiment in that the colored portion as the front / back identification mark 34 provided on the back surface 30 of the stencil plate 20C is a painted portion 44, in that the colored portion is a line made with an oil-based marker.

[0055] That is, in the sixth embodiment, a painted portion 44 is provided on the rear surface 30 of the stencil plate 20C as a colored portion having a color different from that of the front surface 28. In the example shown in Fig. 8, the painted portion 44 is formed on the entire rear surface 30, but the painted portion 44 may be formed on only a part of the rear surface 30, similar to the colored portion 42 of the fifth embodiment.

[0056] The painted portion 44 is a coating film formed by applying paint containing a colorant having a different color from the base material of the metal plate. For example, a coating film having a matte color, a contrasting color, or a fluorescent color may be applied to the base material of the metal plate having a metallic luster. Examples of the coating film include synthetic resin paints having synthetic resins as the main component, oil-based paints having drying oils as the main component, and lacquers having nitrocellulose as the main component.

[0057] In one embodiment, the coating portion 44 may be a resin layer formed by coating a resin composition (synthetic resin paint) containing a colorant on the rear surface 30 of the stencil plate 20C. The type of resin is not particularly limited, and various resins such as epoxy resins can be used.

[0058] In one embodiment, the coating portion 44 may be a coating film formed by spraying a fluorescent paint (also called a luminous paint) containing a fluorescent colorant onto the rear surface 30 of the stencil plate 20C. In this specification, the term "fluorescence" refers to a broad definition of fluorescence that also includes phosphorescence and phosphorescence.

[0059] The coating portion 44 may be formed, for example, by spraying paint onto one side of the metal plate fed out in the above step (1) in the first embodiment. The coating portion 44 may be formed before the metal plate is cut into a long shape, or the stencil plate 20C may be manufactured by forming the coating portion 44, cutting the metal plate into a long shape, and then performing the above steps (2) and (3).

[0060] The other configurations and effects of the sixth embodiment are the same as those of the fifth embodiment, and therefore a description thereof will be omitted.

[0061] [Seventh embodiment] The front / back discrimination mark 34 of the first to sixth embodiments may be formed by combining any two or more of them. For example, the depressions 40, 40A of the first to fourth embodiments may be combined with the colored portions of the fifth and sixth embodiments.

[0062] In this case, it is preferable that the front / back identification mark 34 is formed on the back surface 30 in depressions 40, 40A that do not reach the front surface 28, and further formed with a color different from that of the front surface 28. More specifically, scratches with a marking needle or grindstone, unevenness by knurling, or a large number of minute depressions by shot blasting are formed in advance, and then colored portions 42 with an oil-based marker or painted portions 44 painted with paint are provided on the depressions 40, 40A thus formed.

[0063] This allows the ink of the oil-based marker or the applied paint to seep into the depressions 40, 40A, making it difficult for the colored parts to disappear. Also, when forming the depressions and the colored parts continuously while unrolling and feeding the long metal plate from the roll, even if there is a problem with the formation of one of them (for example, the ink of the oil-based marker runs out), the front / back identification mark will be formed by the other, so it is possible to avoid the problem of the front / back identification mark not being formed at all.

[0064] Although several embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. [Explanation of symbols]

[0065] T...pneumatic tire, 10...tire vulcanization mold, 12...tire molding surface, 20, 20A, 20B, 20C...stencil plate, 22...mounting recess, 28...surface, 30...backside, 32...mark forming portion, 34...front / rear identification mark, 36...recess, 38...projection, 40, 40A...dent, 42...colored portion, 44...painted portion

Claims

1. A stencil plate that is attached to a mounting recess provided on a tire molding surface of a tire vulcanization mold and is used to form a tire identification mark on an outer surface of a tire, a surface that contacts the outer surface of the tire during tire molding, a back surface that faces the mounting recess side during tire molding, a mark forming section for forming a tire identification mark on the outer surface of the tire, and a front / back identification mark that is provided on the back surface without appearing on the surface and for identifying the front and back of the stencil plate, The stencil plate, wherein the front / back identification mark extends in the longitudinal direction of the stencil plate.

2. 2. The stencil plate according to claim 1, wherein the front / back identification mark includes a recess provided on the rear surface and not reaching the front surface.

3. 3. The stencil plate of claim 2, wherein the recesses are formed by scratching, knurling or shot blasting the back surface.

4. 4. The stencil plate according to claim 1, wherein the front / back identification mark includes a colored portion having a color different from that of the front surface.

5. 5. The stencil plate according to claim 4, wherein the colored portions are lines made with a permanent marker.

6. 5. The stencil plate according to claim 4, wherein the colored portion is a painted portion.

7. 2. The stencil plate according to claim 1, wherein the front / back identification mark is formed by applying a color different from that of the front surface to a recess provided on the back surface that does not reach the front surface.

8. The stencil plate according to any one of claims 1 to 7, wherein the mark forming portion is a recess for forming a convex tire identification mark on the outer surface of the tire, and a convex portion corresponding to the recess is provided on the back surface.

9. A tire molding surface; A mounting recess provided on the tire molding surface; The stencil plate according to any one of claims 1 to 8, which is mounted in the mounting recess; A tire vulcanizing mold comprising:

10. A method for manufacturing a stencil plate according to any one of claims 1 to 8, comprising the steps of: forming the front / back identification mark on a surface of the metal plate corresponding to the back surface; forming the mark forming portion by embossing the metal plate having the front / rear identification mark; cutting the metal plate provided with the mark forming portion into an outer shape of a stencil plate; A method for manufacturing a stencil plate, comprising:

Images