JP4262872B2 - Method and apparatus for adjusting tension of belt-like extruded material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tension adjusting method and an adjusting device for a belt-like extruded material, and more specifically, a state in which a belt-like material having a cross section in the width direction extruded from an extruder and having different thicknesses at both end portions is stabilized in dimensional accuracy. The present invention relates to a tension adjusting method and an adjusting device for a belt-like extruded material that can be extruded by the above method.
[0002]
[Prior art]
Conventionally, when continuously extruding belt-shaped rubber materials such as tire constituent materials, especially bead fillers whose cross-sectional shape in the width direction is formed into a substantially triangular shape, the extrusion speed is both ends due to the difference in the thickness cross-section of the extrudate. There is a problem that the shape of the extrudate is not stable.
[0003]
[Problems to be solved by the invention]
That is, when extrudates having a substantially triangular cross section as described above are extruded from a die (die) of the extruder, the rubber flow is faster because the extrudate resistance is smaller on the side where the cross section thickness of the extrudate is larger. On the other hand, the smaller the cross-sectional thickness of the extrudate, the slower the rubber flow due to the greater extrusion resistance, and therefore the end portion with the smaller cross-sectional thickness is made as thin and sharp as possible. There was a problem that there was a difference in level.
[0004]
From the above, the shape in the longitudinal direction after extrusion has a problem that one end side is long and the other end side is short, and the shape becomes a curved shape with the tip portion inside, and stable extrusion cannot be performed.
[0005]
An object of the present invention is to provide a tension adjusting method for a strip-like extruded material and an adjusting device for the same, which can obtain an extrudate having a uniform dimensional accuracy and a stable dimensional accuracy.
[0006]
[Means for Solving the Problems]
Since this invention to achieve the above object, the tension adjusting method of the strip-shaped extruded material of the present invention, the strip-shaped material having a thickness different extruded widthwise cross section both end terminal portions of the extruder, cross-sectional thickness of the extrudate The belt-shaped material is wound with the small diameter side of the tension adjusting roll having a substantially frustoconical cross section positioned on the larger side and the large diameter side of the tension adjusting roll positioned on the side having the smaller sectional thickness of the extrudate. The gist is to adjust the extrusion conveyance speed to be uniform at both ends of the belt-like material during extrusion.
[0007]
A cross section in the width direction of the band-shaped material is a substantially triangular rubber material, and the tension adjusting roll is formed of a resin material that does not adhere to the rubber-like elastic material .
[0008]
Also, the tension adjusting device of the belt-like extruded material of this invention, the tensioning device between the extruder die and the molding machine is installed, a substantially truncated cone comprising the tension adjusting device from a small diameter side and the larger diameter Tension adjusting apparatus comprising: a tension adjusting roll formed in a shape; a swinging arm that can rotate the tension adjusting roll and support the shaft core horizontally; and a stand that supports the swinging arm rotatably. The gist of this is that
Here, the tension adjusting roll is made of a urethane resin material that does not adhere to the rubber material.
[0009]
The present invention is configured as described above, and a strip-shaped material having a cross section in the width direction extruded from an extruder and having different thicknesses at both end portions has a substantially frustoconical cross section on the side where the cross section thickness of the extrudate is large. Position the small diameter side of the adjusting roll and hang the large diameter side of the tension adjusting roll on the side where the cross-sectional wall thickness of the extrudate is small . By adjusting so that it may become uniform in both ends, the extrudate in which the dimensional accuracy of uniform length was stabilized can be obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0011]
FIG. 1 is a schematic configuration diagram of a tension adjusting device for a belt-like extruded material embodying the present invention, FIG. 2 is a perspective view in use, 1 is an extruder, 2 is a die (die), and 3 is an extruder. 1 is a belt-shaped material W having a substantially triangular cross section with different thicknesses at both end portions extruded from 1 (in this embodiment, a bead filler used as a tire constituent material is used. The tension adjusting device 4 for adjusting the tension (not limited) is a molding machine for the next process, for example, a bead molding machine.
[0012]
As shown in FIGS. 2 and 3, the strip-shaped material W extruded from the die 2 has a substantially triangular cross section, and therefore the thickness t of the strip-shaped material W extruded from the die 2 is thick. When the base end side Wa and the front end side Wb whose tip is formed at an acute angle are extruded at the same pressure, the base end side Wa having a low extrusion pressure (low extrusion resistance) has a fast rubber flow. The extrusion speed is also high, and on the tip side Wb, since the extrusion resistance is large, the rubber flow becomes slow and the extrusion speed becomes slow. As a result, a step is formed between the proximal end portion Wa and the distal end side Wb of the band-shaped material W.
[0013]
Therefore, in the present invention, in order to correct the difference in the extrusion speed of the rubber-like elastic material, the tension adjusting device 3 is installed between the extruder 1 and the molding machine 4 in the next process.
[0014]
The tension adjusting device 3 includes a tension adjusting roll 5 having a substantially frustoconical cross section, a swinging arm 6 that can rotate the tension adjusting roll 5 and supports the shaft core O horizontally, and the swing adjusting roll 5. It is comprised with the stand 7 which supports the arm 6 rotatably.
[0015]
The tension adjusting roll 5 has a length L that is slightly longer than the width H of the band-shaped material W and is a tapered roller. The material is a rubber-like elastic material (rubber) of the band-shaped material W except for the core material. ) And a resin material such as urethane that does not adhere to the surface.
[0016]
The weight of the tension adjusting roll 5 is about 60 g to 300 g and can be adjusted by the weight. The size and weight of the belt-like material W are adjusted by the weight of the tension adjusting roll 5. Further, in the tension adjusting roll 5 formed in a substantially frustoconical cross section, the difference (D−d) between the small diameter portion d and the large diameter portion D depends on the cross sectional shape of the band-shaped material W. When the thickness of the proximal end side Wa is 6.5 mm, the distal end side Wb is 0.5 mm, and the length is 25 mm to 55 mm, the tension adjusting roll 5 having a small diameter portion d of 20 mm and a large diameter portion D of 45 mm is provided. use.
[0017]
As described above, in the present invention, the tension adjusting roll 5 is a truncated cone-shaped taper roll corresponding to the shape of the band-shaped material W, so that the extruded band-shaped material W extrudes a material having a substantially triangular cross section. Also, the difference in the rubber flow between the base end side Wa and the front end side Wb of the extrudate W to be extruded due to the difference in the circumferential length of the tension adjusting roll 5 is corrected or corrected, and then the length is made uniform. Can be supplied to the process.
[0018]
【The invention's effect】
The present invention has established a tension adjusting device between the die and the molding machine extruder as described above, formed in a substantially truncated cone shape made of the tension adjusting device from a small diameter side and the larger diameter tension An extruder equipped with an adjustment roll, a swing arm that can rotate the tension adjustment roll and support the shaft core horizontally, and a stand that rotatably supports the swing arm. A strip-shaped material having a cross section in the width direction extruded from the end portion at both ends is positioned on the small diameter side of the tension adjusting roll having a substantially frustoconical cross section on the side where the cross section thickness of the extrudate is large. Hang in a state where the large diameter side of the tension adjusting roll is positioned on the side where the cross-sectional wall thickness is small , and when extruding the strip-shaped material, the extrusion conveyance speed is adjusted to be uniform at both ends of the strip-shaped material. Stable dimensional accuracy It is possible to obtain a Dashimono at all times, there is an effect that it is possible to enhance the accuracy of the product.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a tension adjusting device for a strip-like extruded material embodying the present invention.
FIG. 2 is a perspective view in use.
FIG. 3 is a cross-sectional view of a strip material extruded from a die.
[Explanation of symbols]
1 Extruder 2 Die (Mold)
3 Tension adjusting device 4 Bead molding machine 5 Tension adjusting roll 6 Oscillating arm 7 Stand W Band-shaped material Wa Base end side Wb Tip end d Small diameter part D Large diameter part

Claims (5)

Extrude the strip-shaped material with different cross-sectional width in the width direction extruded from the extruder at the both ends at the small diameter side of the tension adjusting roll having a substantially frustoconical cross section on the side where the cross section thickness of the extrudate is large. It is hung with the large-diameter side of the tension adjusting roll positioned on the side where the cross-sectional thickness of the object is small, and when the strip material is extruded, the strip extrusion is adjusted so that the extrusion conveyance speed is uniform at both ends of the strip material Material tension adjustment method.   The method for adjusting the tension of the belt-like extruded material according to claim 1, wherein a cross-section in the width direction of the belt-like material is a substantially triangular rubber material. The tension adjusting method for a strip-like extruded material according to claim 1 or 2, wherein the tension adjusting roll is formed of a resin material that does not adhere to the rubber-like elastic material . The tensioning device between the extruder die molding machine is installed, the tension adjusting roll formed cross section truncated cone shape made of the tension adjusting device from a small diameter side and a large diameter, the tension adjusting roll The tension adjustment of the belt-like extruded material is characterized by the installation of a tension adjustment device comprising a swing arm that can rotate the shaft and horizontally support the shaft core, and a stand that rotatably supports the swing arm. apparatus. The said tension adjustment roll is a tension | tensile_strength adjustment apparatus of the strip | belt-shaped extrusion material of Claim 4 comprised with the urethane resin material which is not closely_contact | adhered to rubber material.

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