KR100771277B1 - Manufacturing device and mathod of cap ply for tire - Google Patents

Abstract

A tire cap ply manufacturing device and a method are provided to prevent a cap ply unwinding fail by successively removing drawing tension for the cap ply by rapidly decreasing the drawing tension toward a winding roll by controlling the speed ratio of first, second, and third drive drawing rolls. A tire cap ply manufacturing device is composed of an extruder or a mill(10) extruding or milling cap ply(4); a drawing unit(20) pulling the cap ply extruded or rolled from the extruder or mill; a cooling drum(30) cooling down the cap ply pulled by the drawing unit; and a winding roll(40) spirally winding the cap ply cooled by the cooling drum. The drawing unit comprises first, second, and third drive drawing rolls(21,22,23) installed from the extruder or mill toward the winding roll in three stages, to control the speed ratio by each motor(M). The cooling drum is disposed at a cap ply transfer path formed between the first and second drive drawing rolls.

Description

Manufacturing device and method for tires {Manufacturing Device and mathod of Cap Ply for Tire}

1 is a partial cross-sectional view showing an example of a general tire.

2 is a principal part configuration diagram showing a cap ply manufacturing apparatus for tires according to the present invention.

3 is a flowchart illustrating a method for manufacturing a cap ply for a tire according to the present invention.

4 is a graph showing the relationship between the extrusion speed of the cap ply and the speed of the third driving tow roll.

5 is a graph showing the relationship between the extrusion speed of the cap ply and the speed of the second driving tow roll.

<Explanation of symbols for main parts of the drawings>

4: cap fly, 4a: single cord,

10: extruder or rolling mill, 20: towing means,

21: first driving tow roll, 22: second driving tow roll,

23: third driving tow roll, 30: cooling drum,

40: winding roll, M: motor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a cap ply for a tire, and in particular, to arrange a single cord at a predetermined interval through the detention and pass it between extruders or rolling mills to cover a rubber layer while maintaining a gap between the single cords. Through a step of extruding or rolling a cap ply, and pulling the cap ply while cooling and winding it on a take-up roll, the first to third driving tow rolls in three steps between the extruder or the rolling mill and the take-up roll. And, by pulling the driving force and the driving speed of the drive towing rolls toward the take-up roll gradually corresponding to the extrusion or rolling speed of the cap ply, the take-up roll in the green case forming process before vulcanization Cap for tires that can solve the problem of loosening of cap ply when unscrew cap ply from Ply manufacturing apparatus and method.

Generally, as shown in FIG. 1, a tire includes an inner 1 constituting the inner circumference of the tire, a carcass 2 stacked on an outer circumference of the inner 1, and the carcass 2. A belt 3 stacked on at least one layer on an outer circumference, a tread 5 stacked on an outer circumference of the belt 3 and substantially in contact with the ground, and laminated between the belt 3 and the tread 5 Caps 4 to reinforce the belt 3, both sidewalls 6 and 6 to form both sides of the tire, and both beads 7 to be coupled to the wheel to maintain the air pressure inside the tire. 7), such a tire technology is well disclosed in Korea Patent Publication No. 2005-51103, Korean Patent Publication No. 2005-35438, and the like.

The cap ply 4 is stacked to completely cover the belt 3, or as shown in FIG. 1, to cover both edges of the belt 3 such that both edges of the belt 3 are not separated. Each stacked.

The cap ply 4 is wound around the take-up roll in a spiral shape while cutting the semi-finished product rolled in a rolling mill in a lengthwise direction to have a constant width, and then rewinds the semi-finished product from the take-up roll in a green case forming process before vulcanization. It is a part that forms a green case by moving it around the belt and slowly moving it sideways at regular intervals.

Looking at the process of manufacturing a capply stacked as described above, in order to simplify the recent capply manufacturing process, instead of using a wide cord woven with several balls, a single cord of every single one to each failure Wrap it up and hang it on a stool. In this state, by inserting the single cords through an extruder having a hole for aligning and passing the single cords through the extruder or the rolling mill, the extruded or rolled capply coated with a rubber layer while maintaining the desired distance between the single cords. do.

However, according to this method, a constant pressure is applied to the single cords above and below the single cords passing through the extruder and the extruder or the rolling mill at predetermined intervals, and the rubber caps are coated through the single cords. It is pulled by the towing roll and passed through the cooling drum to cool, and the cooled cap ply is wound in a continuous spiral form on the take-up roll. Even in the process of winding the cap ply on the take-up roll, a constant tension is applied to each single cord.

When the cap ply is wound on the take-up roll in the state that such tension is not completely resolved, the cap ply wound on the take-up roll is unwound and fed to the molding machine in the green case forming process before vulcanization. In this case, the adhesion between the outer portion of the cap ply wound and the inner portion of the cap ply wound is severe. In particular, the central cap ply wrapped around the take-up roll has the most shrinkage, so that the cap plies do not loosen due to sticking together. Even if the cap plies are loosened, the rubber is torn off and the single cords of various ol are exposed to the outside. The entanglement causes the cap ply torn in the longitudinal direction and becomes entangled so that the molding process cannot proceed. This problem leads to a decrease in productivity in addition to the low-speed rolling operation, and also to problems such as an increase in waste cap ply due to damage to the cap ply and poor tire quality.

On the other hand, US Patent US 556726 discloses a tension reducing device. Here, a technique for changing the winding speed according to the detection of the diameter of the take-up roll, which cannot be automatically responded by elongation, which is a difference in physical properties according to the type of cord, has been proposed. Irrelevant

The present invention has been made in consideration of the above-described conventional problems, in the process of winding the winding roll while pulling and cooling the cap ply rolled out or extruded through an extruder or rolling mill, in three steps between the extruder or rolling mill and the winding roll. By installing the first to third drive tow roll, and by lowering the traction force and the drive speed by the drive of the drive tow roll toward the take-up roll corresponding to the extrusion or rolling speed of the cap ply, green case forming process before vulcanization In order to solve the problem of loosening of the cap ply when the cap ply from the take-up roll to supply to the molding machine.

In order to achieve the above object, the present invention is an extruder or rolling mill having an extrusion hole formed with a hole for aligning and passing a plurality of single cords, and rolling or extruding the cap ply by applying rubber to the single cords; ; Towing means for pulling a cap ply rolled or extruded from the extruder or the rolling mill; A cooling drum for cooling the cap ply towed by the towing means; And a winding roll for spirally winding and storing the cap ply cooled by the cooling drum, wherein the towing means comprises three steps sequentially from the extruder or the rolling mill toward the winding roll. And a first driving tow roll, a second driving tow roll, and a third driving tow roll, each of which is installed so that the speed ratio can be adjusted by the motor. The cooling drum is disposed in a cap fly transfer path between the first drive tow roll and the second drive tow roll.

According to the manufacturing apparatus of the present invention, it is preferable that the first driving tow roll is disposed at the shortest distance closest to the extrusion slot of the extruder or the rolling mill.

In addition, the tire cap ply manufacturing method according to the present invention, the step of winding each single cord to the failure hanging; Extruding or rolling a capply coated with a rubber layer while maintaining a space between desired single cords by inserting the single cords and passing them between extruders or rolling mills by inserting the single cords into an extrusion slot formed with holes to align and pass the single cords neatly. Wow; It is installed sequentially in three steps downstream from the extruder or the rolling mill, and the traction force by the driving of the first driving towing roll, the second driving towing roll and the third driving towing roll which can adjust the respective speed ratio by the motor Towing and conveying the cap ply extruded or rolled out from the extruder or the rolling mill with a different pulling force for each section; Cooling the cap ply by passing the cap ply through a cooling drum disposed between the first driving tow roll and the second driving tow roll; And spirally winding the cap fly from the third driving tow roll onto the take-up roll.

According to the manufacturing method of the present invention, a section between the extruder or the rolling mill and the first driving tow roll in a first section, a section between the first driving tow roll and the second driving tow roll in a second section, the second section When the section between the drive tow roll and the third drive tow roll is the third section, and the section between the third drive tow roll and the take-up roll is called the fourth section, the cap fly for the first to the fourth section is The traction tensile force ratio is (1 section = 3%)> (2 sections = 1.5%)> (3 sections = 1%)> (4 sections = 0%) with respect to the head pressure of the extruder or rolling mill. It is preferable to lower sequentially.

In addition, the speed ratio between the driving towing rolls may be adjusted by a speed control method that is directly specified according to the extrusion or rolling speed, or may be adjusted to be equal to or less than a specified tensile force in each section by directly measuring the tensile force of the cap ply in each section. have.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

2 shows a cap ply manufacturing apparatus for a tire according to the present invention.

The apparatus for manufacturing a tire cap ply according to the present invention includes an extruder or a rolling mill 10, a towing means 20, a cooling drum 30, and a winding roll 40.

The extruder or the rolling mill 10 is provided with an extrusion hole (not shown) formed with holes for aligning and passing a plurality of single cords caught on a ledge (not shown), respectively, wound on a failure (not shown). The cap ply 4 is rolled or extruded by applying rubber to the single cords 4a that are aligned and passed by this extruder or rolling mill 10.

The towing means 20 is to pull the cap ply 4 which is rolled or extruded from the extruder or the rolling mill 10 to serve to transport.

The towing means 20, respectively, the first driving tow roll 21, the second driving tow roll 22 and the third driving tow roll 23 which are driven to adjust the speed ratio by the motor (M). These are included, these are installed in three steps at predetermined intervals from the extruder or the rolling mill 10 toward the take-up roll 40 in turn.

The cooling drum 30 is installed to cool by passing the cap ply 4 towed by the towing means 20, the first drive tow roll 21 and the second drive tow roll 22 It is arranged in the capply transfer path between and.

The take-up roll 40 is cooled by the cooling drum 30 and the cap ply 4 which is transported by the traction force driven by the second driving tow roll 22 and the third driving tow roll 23. It is to keep the spiral wound. The cap ply 4 wound around the take-up roll 40 is unwound from the take-up roll 40 in a green case forming step and supplied to a green case forming machine (not shown), around the belt 3 (see FIG. 1). Cold.

In addition, the first driving tow roll 21 is preferably disposed at the shortest distance closest to the extrusion slot of the extruder or the rolling mill 10.

In Fig. 2, reference numeral 50 denotes guide rollers which guide the transfer while supporting the cap ply 4.

Next, a method of manufacturing the cap ply 4 by the cap ply manufacturing apparatus for tires according to the present invention configured as described above will be described.

As shown in Figs. 2 and 3, a single cord 4a is prepared, and each single cord 4a is wound around a failure (not shown) and aligned on a hanger (not shown).

Next, the single cords 4a are inserted through the extruder and formed between the extruder or the rolling mill 10 in the extrusion holes formed with holes to align and pass the single cords 4a. While holding, the cap ply 4 covered with the rubber layer is extruded or rolled.

Next, the first driving tow roll 21, the second driving tow roll 22 and the third driving tow roll 23 of the towing means 20 capable of adjusting the respective speed ratios are driven by the driving force. The cap ply 4 extruded or rolled out from the extruder or the rolling mill 10 is pulled with a different pulling force for each section and transferred to the take-up roll 40.

In this case, the speed ratio of the driving tow rolls 21, 22, 23 is controlled to be sequentially lower on the downstream side, that is, toward the take-up roll 40, thereby giving a time opportunity to sequentially remove the traction tension, thereby extruding Alternatively, the cap ply 4, which has been mechanically stretched during the rolling and pulling process, is induced to contract naturally.

That is, the single cord (4a) generally used for the cap fly (4) has a constant elongation by type, usually a single cord (4a) has an elongation of 7.5kg to 7.5% per one, until the break The elongation is 16%, so when the cap ply 4 is pulled on the capply manufacturing line, the mechanical elongation occurs and shrinks again. Therefore, a process in which rubber is rolled through the head of the extruder or the rolling mill 10 on which the extruder is mounted, is coated with the outlet thickness of the extruder, above and below the single cord 4a arranged at regular intervals. At the force of greater than the head pressure of the extruder or the rolling mill 10 is pulled so that the cap ply (4) out of the extrusion mold. At this time, the capply 4 is stretched due to mechanical elongation, and the adhesion between the single cord 4a and the rubber increases as the head pressure of the higher extruder or rolling mill 10 is applied. In addition, the higher the pressure, the greater the traction tensile force, so that when the traction tension is removed, the contraction time of the naturally tensioned cap ply 4 becomes longer, and the elongation is increased at high traction force due to the characteristics of the single cord 4a, thereby increasing the tensile force. When removed completely, the contraction time is longer. This contraction time increases in proportion to the residence time under traction.

Therefore, immediately after the single cord 4a is pulled out of the extruder or the extruder 10 of the extruder 10, a low tensile force is applied between the first drive tow roll 21 and the second drive tow roll 22 to receive a high traction force. It is important to reduce the residence time as much as possible. In addition, while the traction transfer of the cap ply 4 is carried out between the second driving tow roll 22 and the third driving tow roll 23, the cap ply 4 provides a low traction force such that the cap ply 4 is not entangled with each other. To this end, the speed ratio of the driving towing rolls 21, 22, and 23 should be lowered toward the downstream side, and the ratio is specified differently according to the extrusion or rolling speed.

Although it depends on the diameter of the drive towing rolls 21, 22 and 23, assuming that the diameter of the drive towing rolls 21, 22 and 23 is the same, in general, the towing rolls 21, 22, The speed of 23) is set in the order of the first drive tow roll 21, the second drive tow roll 22, and the third drive tow roll 23, based on the second drive tow roll 22 in order. do. That is, the tensile force of the cap ply 4 between the first drive tow roll 21 and the second drive tow roll 22 should be less than 1.5% in conjunction with the head pressure conditions of the extruder or rolling mill 10. In addition, the ratio between the second driving tow roll 22 and the third driving tow roll 23 should be less than 1%, and a speed ratio with little traction tension should be set just before winding on the take-up roll 40.

Of course, in this process it is necessary to set the speed ratio of the three drive towing rolls (21, 22, 23) so as not to get tangled with each other when moving between the cap ply (4).

Without using the method of minimizing the towing tension according to the speed ratio, a measurement roll (not shown) for measuring the tensile force in real time is attached between the driving towing rolls 21, 22, and 23 to directly measure the towing tension, and towing The speed ratio can be adjusted automatically so that the tension is gradually lowered. This is a slower response and a less effective method than the first method, but it is a usable and useful method.

That is, the speed ratio between the drive towing rolls 21, 22, 23 is adjusted by a speed control method that is directly designated according to the extrusion or rolling speed, or by directly measuring the tensile force of the cap ply 4 in each section. It can be adjusted to be below a specified tensile force in the section. That is, in the former case, the driving speed ratio according to the program can be controlled in a manner of being interconnected according to the elongation according to the type of the single cord 4a, and in the latter case, the tensile force measured from the recognition force measuring device is transmitted in real time. The speed ratio can be adjusted by the circulation control method between speed and tensile force.

Whichever method is used, the first drive tow roll 21 should be installed at the shortest distance from the exit of the extrusion slot of the extruder or rolling mill 10 where extrusion or rolling takes place. This is because a rapid recovery of the cap fly 4 can be expected only when the residence time under high traction tension is reduced to a minimum.

When the cap ply 4 is towed, the stretching force changes due to the extrusion or rolling speed increase because the head pressure of the extruder or the rolling mill 10 changes with the rolling speed, and the cap ply 4 including the single cord 4a Since there is a change according to the material of the configuration, it is necessary to adjust the speed ratio of the driving towing rolls 21, 22, and 23 according to the extrusion or rolling speed, and the driving towing roll 21 for each standard of the cap fly 4. , The speed ratio of 22, 23 is set so that the tensile force of the cap ply 4 satisfies the elongation rate for each section as described above, and then the speed ratio condition of the drive towing rolls 21, 22, 23 is set. To the extrusion or rolling speed, the conditions of FIGS. 4 and 5 (that is, the relationship between the extrusion or rolling speed and the speed of the driving tow rolls 21, 22, and 23) are inputted to the controller, and The drive towing rolls 21, 22, and 23 may be driven by selecting according to the standard.

In summary, as shown in FIG. 2, a section between the extruder or the rolling mill 10 and the first driving tow roll 21 is formed in a first section, the first driving tow roll 21 and the second driving section. A section between the traction roll 22 is a second section, a section between the second driving tow roll 22 and the third driving tow roll 23 is a third section, and the third driving tow roll 23 When a section between the take-up rolls 40 is referred to as a fourth section, the pulling force ratio of the cap ply 4 with respect to the first to fourth sections is based on the head pressure of the extruder or the rolling mill 10 ( The first section = 3%)> (second section = 1.5%)> (third section = 1%)> (fourth section = 0%) is preferably lowered sequentially.

Next, as described above, in the process in which the cap ply 4 is towed and transported by the towing means 20 including three driving towing rolls 21, 22, 23, the first driving tow The cap ply 4 is cooled by allowing the cap ply 4 to pass through the cooling drum 30 disposed between the roll 21 and the second driving tow roll 22.

Then, the cap ply 4 cooled as described above is transferred to the traction force by the driving of the second driving tow roll 22 and the third driving tow roll 23, and from the third driving tow roll 23. It is wound up spirally by the winding roll 40.

According to the apparatus and method for manufacturing a cap ply for a tire according to the present invention configured as described above, the first driving tow roll 21 and the second driving tow roll 22 and the third driving tow roll sequentially installed in three steps. By adjusting the speed ratio of 23, the pulling force of the cap ply 4 is drastically lowered toward the downstream side, i.e., toward the take-up roll 40, thereby pulling the pulled to the tensioned cap ply 4 as it is extruded or rolled out. Since the cap ply 4 can be effectively shrunk by sequentially removing the tension, the cap ply 4 generated when the cap ply 4 is released from the take-up roll 40 and supplied to the molding machine in a green case forming process. The problem of loosening of) can be solved beforehand.

In addition, since the cap ply 4 is not damaged when the wound cap ply 4 is unwound, tire manufacturing productivity can be improved, material waste can be reduced by reducing the waste amount of the damaged cap ply 4, and tire quality Can improve.

In addition, through the continuous process, the cap ply 4 can be manufactured at high speed without damage, and the operation personnel and the installation place can be greatly reduced by the automation and the simplification of the equipment. Effective use can be promoted.

Claims (5)

An extruder having a hole in which a plurality of single cords 4a are arranged and aligned to pass through, and an extruder or a rolling machine 10 for rolling or extruding the cap fly 4 by applying rubber to the single cords; Traction means 20 for pulling a cap ply rolled or extruded from the extruder or the rolling mill; A cooling drum (30) for cooling the cap ply towed by the towing means; In the cap ply manufacturing apparatus for tires comprising: a winding roll 40 for spirally winding the cap ply cooled by the cooling drum; The traction means is installed in three steps in turn from the extruder or the rolling mill toward the take-up roll, and each of the first driving tow rolls 21 and the second driving tow rolls are driven to adjust the speed ratio by the motor M, respectively. (22) and the third driving dog roll (23); The said cooling drum is arrange | positioned in the capply conveyance path | route between the said 1st drive tow roll (21) and the said 2nd drive tow roll (22), The tire cap ply manufacturing apparatus characterized by the above-mentioned. The method of claim 1, The first driving tow roll 21 is a cap ply manufacturing apparatus for a tire, characterized in that arranged in the shortest distance closest to the extrusion port of the extruder or rolling mill (10). Winding each single cord 4a to a hanger by failure; By passing the single cords through the extruder or the rolling mill 10 by inserting the single cords into an extrusion hole having a hole for aligning and passing the single cords, the cap ply 4 coated with a rubber layer is maintained while maintaining a desired distance between the single cords. Extrusion or rolling; The first driving tow roll 21, the second driving tow roll 22, and the third driving, which are sequentially installed in three stages downstream from the extruder or the rolling mill, and each speed ratio can be adjusted by the motor M. Towing and conveying the cap ply (4) extruded or rolled out from the extruder or the rolling mill by a traction force driven by the traction roll (23) with a different traction force for each section; Cooling the cap ply by passing the cap ply through a cooling drum (30) disposed between the first driving tow roll and the second driving tow roll; And, Capillary cap ply manufacturing method comprising the; step of spirally winding the cap ply from the third driving tow roll (23) to the take-up roll (40). The method of claim 3, wherein The first section of the section between the extruder or rolling mill 10 and the first driving tow roll 21, the second section of the section between the first driving tow roll and the second driving tow roll 22 When the section between the second driving tow roll and the third driving tow roll 23 is a third section, and the section between the third driving tow roll and the take-up roll 40 is a fourth section, The pulling force ratio of the cap ply 4 with respect to the first section to the fourth section, The first pressure = 3%> (second section = 1.5%)> (third section = 1%)> (fourth section ≒ 0%) with respect to the head pressure of the extruder or rolling mill A tire cap ply manufacturing method characterized by the above-mentioned. The method according to claim 3 or 4, The speed ratio between the driving towing rolls 21, 22, and 23 is controlled by a speed control method that is directly designated according to the extrusion or rolling speed, or by directly measuring the tensile force of the cap ply 4 in each section. A cap ply manufacturing method for a tire, characterized in that adjusted to be below a specified tensile force.

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