JP2013111787A - Device and method for storing tire-molding extrusion tread - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for storing tire-molding extrusion tread, configured to prevent shrinkage of an extrusion tread, while preventing any foreign objects from entering during storage, and to prevent air from remaining when bonded to a low cover.SOLUTION: The device for storing a tire-molding extrusion tread stores the extrusion tread extruded from an extruder and cut into a predetermined length until the extrusion tread is used for molding the low cover. The device includes: a tray provided with a recess for storing the tire-molding extrusion tread; and a lid provided with protrusions that form air vent grooves on a surface of the tire-molding extrusion tread. In the device for storing the tire-molding extrusion tread, the recess has a depth enough to bring the protrusion into contact with an upper surface of the tire-molding extrusion tread when a lid is closed. The device is used in the method for storing the tire-molding extrusion tread.

Description

  The present invention relates to a storage device for a tire forming extruded tread used for molding a raw cover and a method for storing the extruded tread using the storage device.

  In the field of automotive tires, the demand for FV has become increasingly severe in recent years.

  One of the causes of FV deterioration is that the extruded tread for tire molding (hereinafter also simply referred to as “extruded tread”) shrinks (shrinks) during storage, resulting in variations in length. That is, the extruded tread is generally formed into a long strip by extrusion molding, and after being cut into a predetermined length, it is placed in alignment on a leaf tray or the like until it is used for forming a low cover. Since the shrinkage occurs during the storage and the shrinkage amount is not uniform, the length of the extruded tread after the storage varies.

  Thus, a technique has been developed in which the material is stored in a state in which the shrinkage with time at both ends of the extruded tread is forcibly suppressed and then sent to the raw cover molding process (for example, Patent Document 1).

  Specifically, a technology that forcibly suppress shrinkage of extruded treads over time by sticking non-stretchable sheet bodies to both ends of extruded treads or pressing both ends with the back of stacked leaf trays Has been developed.

JP 2003-53856 A

  However, in the case of the method described in Patent Document 1, although shrinkage of the extruded tread can be suppressed, there is a possibility that foreign matter is mixed due to adhesion of the sheet body to the tread or forgetting to remove it. Moreover, since the surface of the extruded tread stored in the leaf tray is smooth, there is a possibility that air is entrained at the time of raw cover molding and air residue is generated at the time of vulcanization. For this reason, it is necessary to perform holing (drilling) on the raw cover to which the extruded tread is attached to remove the remaining air.

  In view of the above-described problems of the prior art, the present invention can improve the FV accuracy by suppressing the shrinkage of the extruded tread without contamination by foreign matter during storage, and the remaining air during pasting on the raw cover. It is an object of the present invention to provide a storage device and a storage method for an extruded tread for forming a tire capable of suppressing the occurrence of the tire.

The invention described in claim 1
A storage device for an extruded tread for forming a tire for storing an extruded tread extruded from an extruder and cut into a predetermined length until the raw tread is molded,
A tray provided with a recess for accommodating the extruded tread for tire molding;
A lid provided with a ridge that forms a groove for air venting on the surface of the extruded tread for tire molding,
A storage device for an extruded tread for tire molding, characterized in that the depth of the recessed portion is formed to a depth at which the ridges are pressed against the upper surface of the extruded tread for tire molding under a closed state. is there.

The invention according to claim 2
2. The storage device for an extruded tread for forming a tire according to claim 1, wherein the ridge is formed of a wire.

The invention according to claim 3
A method for storing an extruded tread for tire molding using the storage device for an extruded tread for tire molding according to claim 1 or 2,
After placing an extruded tread for tire molding, which is molded by an extruder and cut into a predetermined length, in the storage device for the extruded tread for tire molding,
Until the raw cover is formed, the extruded tread is stored in a pressed state by a lid having the protruding line, and a groove for air bleeding is formed on one side of the extruded tread for forming a tire. This is a method for storing an extruded tread for forming a tire.

  According to the present invention, the FV accuracy can be improved by suppressing the shrinkage of the extruded tread without foreign matter being mixed during storage, and the occurrence of residual air can be suppressed when sticking to the raw cover. A tire storage extruded tread storage device and storage method can be provided.

It is a perspective view which shows the storage apparatus of the extrusion tread for tire shaping | molding in one embodiment of this invention. It is a longitudinal cross-sectional view which shows the tray of the storage apparatus of the extrusion tread for tire shaping | molding in one embodiment of this invention. It is (a) top view and (b) perspective view which show the example of the arrangement | sequence of the groove | channel for air bleeding formed in the extrusion tread. It is sectional drawing which shows an example of the shape of the extrusion tread after being stored.

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

1. 1 is a perspective view showing a storage device for a tire molding extruded tread according to the present embodiment, and FIG. 2 is a longitudinal sectional view showing a tray of the tire molding extruded tread storage device. It is.

  In FIG. 1, 1 is a storage device for an extruded tread for forming a tire, 2 is an extruded tread, 4 is a tray, 5 is a lid, 5a is an inner surface of the lid 5, 6 is a protrusion provided on the inner surface 5a of the lid 5, 8 Is a cart, and 9 is a wheel of the cart 8. In FIG. 2, 4 a is a peripheral frame portion of the tray 4, 4 b is a bottom surface of the tray 4, and 4 c is a concave portion of the tray 4.

  The tire forming extruded tread storage device 1 includes a tray 4 and a lid 5, and the tray 4 has a recess 4c that can accommodate a plurality of extruded treads 2 (three in this embodiment) arranged in the width direction. The bottom surface 4b is formed to be a smooth surface, and the recess 4c is formed to a depth at which the protrusion 6 is pressed against the upper surface of the extruded tread 2 accommodated in the recess 4c under a closed state. Yes.

  On the inner surface 5a of the lid 5, a plurality of ridges 6 are provided obliquely at a predetermined interval. The ridge 6 is provided, for example, by joining a metal wire to the inner surface 5 a of the lid 5. The ridges 6 are preferably formed of a wire having a diameter of 2 to 10 mm so that a groove having a size effective for air bleeding is formed on the back surface of the extruded tread 2, and the interval and the number thereof are matched to the type of tire. Is set as appropriate.

  The material for forming the ridge 6 is not limited as long as it can form a groove for venting air. In addition to the wire, a member having a circular or polygonal cross section (material is not limited) may be used. However, a wire is preferable because the protrusion 6 can be easily formed. The cross-sectional shape of the ridge 6 is not limited to a circle like a wire, but may be a triangle. As a material for the tray 4 and the lid 5, SUS, iron, titanium, and the like are preferable from the viewpoint of material retention and shrinkage prevention.

2. Storage Method of Extruded Tread for Tire Formation A long tread rubber extruded from an extruder outside the figure is cut into a predetermined length by a cutter device outside the figure to form an extruded tread 2. A plurality of extruded treads 2 are placed in alignment in the recess 4c of the tray 4, and then the lid 5 is closed and stacked on the carriage 8 for storage.

  When gravity such as the lid 5 and the stacked trays 4 is applied to the extruded tread 2 during storage, the ridges 6 provided on the inner surface 5a of the lid 5 of the tray 4 press the extruded tread 2, A plurality of air vent grooves 7 (see FIG. 3) are formed on the ridge 6 over the entire surface of one side of the extruded tread 2, and the extruded tread 2 is held to suppress the occurrence of shrinkage.

  Since the tray 4 is provided with a peripheral frame portion 4a having a height that is substantially the same as or slightly higher than the thickness of the extruded tread 2, even when a plurality of treads 2 are stacked, the extruded products loaded in the lower stage An excessive load is not applied to the tread 2. Further, the lid 5 reliably prevents foreign matter from entering the extruded tread 2 being stored.

  FIG. 3 shows an example of the arrangement of the air vent grooves 7 of the extruded tread 2 manufactured by the tire extruded tread storage method of the present invention, where (a) is a plan view and (b) is a perspective view. FIG. 3 shows the formation patterns (a) to (d) of four types of air vent grooves 7. However, the pattern of air vent grooves 7 is limited to these examples. Instead, an appropriate pattern is appropriately adopted as necessary. The air release groove 7 of any formation pattern is formed in such a manner that it vertically cuts from one end to the other end in the width direction or length direction of the extruded tread 2 so that air can escape.

FIG. 4 is a cross-sectional view showing an example of the shape of the extruded tread 2 after being stored in the tire extruded tread storage device for a predetermined time. As shown in FIG. 4, an air bleeding groove 7 is formed on one side of the extruded tread 2 by the protruding line. And the surface in which the groove | channel 7 for air bleeding was formed becomes a sticking surface to a raw cover. The reason why the widths of the front and back surfaces of the extruded tread 2 are different is to make the shape of the low cover close to the tread shape of the tire.

3. Advantages of the present embodiment (1) Since the extruded tread 2 is pressed by the lid 5 and held by the ridges 6 during storage until the extruded tread 2 is subjected to molding of the raw cover, shrinkage of the extruded tread 2 is prevented. By suppressing it, FV accuracy can be improved. Moreover, mixing of foreign substances is prevented.

(2) Since an air bleeding groove 7 is formed on one side of the extruded tread 2 so as to be longitudinally cut from one end to the other end in the width direction or the length direction of the extruded tread 2, air at the time of sticking to the raw cover Can be reliably removed from the air vent groove 7, and the hovering of the low cover for air venting becomes unnecessary.

(3) Since it is an extremely simple method of forming the ridges 6 on the lid 5, the occurrence of troubles is low while being inexpensive.

  Next, the present invention will be described more specifically with reference to examples.

1. Tire storage (Example)
(1) Storage of Extruded Tread After extrusion molding, cut to a predetermined length, and prepare an extruded tread having a size of 185 / 65R15 tire, a thickness of 7.0 mm, and a length of 1,800 mm, It was stored by the method described in the above embodiment. The ridges are parallel to each other with a wire having a diameter of 3.0 mm (manufactured by Sumitomo Electric Industries, Ltd.) at an interval of 30 mm and at an inclination of 45 ° with respect to the longitudinal direction of the extruded tread, as shown in FIG. Arranged. The storage period was 3 hours.

  The extruded tread after storage was taken out and the shrinkage was measured. As a result, it was confirmed that the shrinkage was about 2-3 mm, which was significantly reduced from 5-8 mm of the comparative example. Moreover, it confirmed that the groove | channel for air bleeding of depth 1.0mm was formed over the back surface whole surface.

(2) Manufacture of tire A raw cover was molded using an extruded tread that had been stored in the storage device for a predetermined time, and then vulcanized to manufacture a tire (finished product). The number of samples was 10,000.

(Comparative example)
A tire was manufactured in the same manner as in the example except that the extruded tread was held by a wire during storage. At this time, the shrinkage of the extruded tread after storage was about 5 to 8 mm.

2. Evaluation of tire (1) Evaluation method a. FV accuracy JIS D4233 FV was measured by a uniformity test method for automobile tires, and a standard deviation was obtained.

B. Air remaining scrap Of the tires manufactured, the number of tires that became air remaining scrap was examined.

C. Foreign matter contamination The presence or absence of foreign matter contamination was examined by FTIR.

(2) Evaluation results a. FV Accuracy The standard deviation of the comparative example was 17, whereas the example was 12. In the example, the standard deviation of FV was reduced by 30% compared to the comparative example.

B. Air remaining scrap The air remaining scrap in the comparative example was 8 while the example was 0. In the example, the number of air remaining scrap was almost 0 as compared with the comparative example.

C. Foreign matter contamination In the example, the number of foreign matter contamination was almost zero.

  As described above, the difference between the example and the comparative example is that, in the case of the example, in addition to suppressing the shrinkage, a groove for air bleeding was formed, and the effect of the present invention could be confirmed. It was.

  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 Storage device of tire forming extrusion tread 2 Tire forming extrusion tread 4 Tray 4a Tray peripheral frame portion 4b Tray bottom surface 4c Tray concave portion 5 Lid 5a Lid inner surface 6 Convex strip 7 Air release groove 8 Bogie 9 Wheel

Claims (3)

A storage device for an extruded tread for forming a tire for storing an extruded tread extruded from an extruder and cut into a predetermined length until the raw tread is molded,
A tray provided with a recess for accommodating the extruded tread for tire molding;
A lid provided with a ridge that forms a groove for air venting on the surface of the extruded tread for tire molding,
The tire molding extruded tread storage device, wherein the recess has a depth that allows the projections to be pressed against the upper surface of the tire molding extruded tread in a closed state.   The storage device for a tire forming extruded tread according to claim 1, wherein the protrusion is formed of a wire. A method for storing an extruded tread for tire molding using the storage device for an extruded tread for tire molding according to claim 1 or 2,
After placing an extruded tread for tire molding, which is molded by an extruder and cut into a predetermined length, in the storage device for the extruded tread for tire molding,
Until the raw cover is formed, the extruded tread is stored in a pressed state by a lid having the protruding line, and a groove for air bleeding is formed on one side of the extruded tread for forming a tire. To store the extruded tread for forming a tire.

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