KR101200953B1 - Apparatus for manufacturing and molding tire tread by calendaring - Google Patents

Abstract

The present invention provides an open system that facilitates heat dissipation, suppresses heat generation more than necessary, and prevents mixing of different kinds of compounds, while stacking the rolled thin rubber sheets one by one. It is to provide a tire tread manufacturing and molding apparatus using a rolling method that there is no space between the prepared tread and prevent air inflow between the carcass, the belt during the final molding.

Description

Rolled Tire Tread Forming Machine {Apparatus for manufacturing and molding tire tread by calendaring}

The present invention relates to a rolled tire tread forming machine. More specifically, the present invention relates to a rolling tire tread forming machine capable of simultaneously producing and molding a tire tread using a rolling method.

Recently, as the required performance of tires is diversified, tires having various profiles such as tread width and groove depth of existing tires are produced, and tire tread compositions are also replaced from carbon black fillers to silica fillers, and filler content in compounds is also increased. There is a growing trend.

In the manufacture of tire treads, the compound produced after finishing the refining process is loaded on a pallet, and the temperature of the compound drops to room temperature (about 25 ° C.) after a certain aging period. Rubber, which has fallen to room temperature, is more elastic than viscous, making flowability and processing difficult. Therefore, in order to obtain a sheet having a desired thickness through a calender, a process of heating the rubber immediately before calendering is required.

According to Korean Patent Laid-Open Publication No. 10-2003-0095788, a technique of manufacturing a semi-finished laminated rubber member (see FIG. 1) by winding laminated strip rubber supplied through an extruder on a forming drum in a green tire manufacturing process is introduced. It is. For example, the rubber material is extruded into a strip rubber shape through an extruder to form a laminated rubber member on the molding drum side. A cutter and a guide conveyor are installed adjacent to the head of the extruder, and a pair of calendar rolls are installed at the end of the guide conveyor. An apparatus is provided in which a calendar roll is configured to reciprocate and advance back and forth along a rotation axis direction of a rotating forming drum.

As described above, the Republic of Korea Patent Publication adds an extrusion process by an extruder to a rubber heating process to compensate for the conventional problems, and it is also a current trend to manufacture a tread using such an extruder.

However, this extrusion process has the following problems.

First, since the extruder is composed of a closed system, the use of silica filler and a large filler content compound cause excessive heat generation during extrusion when the compound passes through the extruder due to friction between the filler and the filler. This makes the extrusion production rate very low. In addition, when extruding a complicated pattern of treads, the rubber flow is disturbed depending on the shape of the extrusion die, so that the surface of the extrudate is rough or peeled off and it is difficult to obtain a desired tread profile.

Second, if the tire tread is produced using an extruder, all the rubber remaining inside the extruder should be removed when the compound specification is changed. The only way is to push the compound. At this time, because the heterogeneous compound is mixed in the extruder, waste rubber is generated.

Third, due to the viscoelasticity of the rubber compound, the rubber under pressure in the extruder will shrink and expand after exiting the extruder. Due to the properties of the rubber, it is difficult to predict the change of the extrudate width after extrusion, and it is very difficult to design and manufacture the extrusion die.

Accordingly, the problem of the present invention is to open up a thin layer of rolled thin rubber sheet while making it easy to dissipate heat in an open system, to suppress heat generation more than necessary, and to prevent mixing of different kinds of compounds. It is to provide a rolled tire tread molding machine that can be raised so that there is no space between the finally produced tread and prevent air inflow between the carcass, the belt during the final molding.

Solution to Problem The present invention for achieving the above problems,

A plurality of hot rolling mills for heating the rubber compound material in multiple stages to take out rubber in a sheet form; A cutter knife for cutting the rolled thin sheet rubber drawn out from the rolling mill into a desired width according to a product specification; And

Characterized in that it consists of a forming drum to be laminated by cutting the thin sheet of the rolled thin sheet rubber.

According to the rolling tire tread molding machine according to the present invention, the tread can be manufactured and molded at the same time in a rolling manner, and a fixed amount of rubber can be used in the tread production, and rubber mixing can be prevented when the production standard is replaced, and extrusion can be performed. Tread manufacturing of this difficult profile has the effect of reducing profile deviation as well.

1 is a conceptual diagram of a tread produced by a conventional extruder.
2 is a block diagram of a rolled tread molding machine of the present invention.
3 is a conceptual diagram of a tread produced through the present invention.
Figure 4 is a 3D profile of the tread cross section produced by the rolling tread forming machine.
Figure 5 is a 3D profile of the tread cross section manufactured by a general extruder

The present invention is a rolling tire tread forming machine, the first rolling mill 211, the second rolling mill 212, which rotates in opposite directions while being connected to each other, as shown in FIG. ), The third rolling mill 213 and the fourth rolling mill 214, and the first rolling mill 211 and the second rolling mill 212, the third rolling mill 213 and the fourth rolling mill ( Primary rolled sheet rubber is drawn out from the gap of 214, respectively, and is rotated while attaching the first rolled rubber sheet from the gap of the second rolling mill 212 and the third rolling mill 213 to join them. The thin sheet rubber 216 is pulled out by rolling in multiple stages from the rubber banks 215, which are rubber compound materials, as the secondary rolled sheet rubber is withdrawn.

The sheet rubber 216 drawn out from the hot rolling mill 21 is cut to a desired width by a cutter knife 23 connected to the guide roll 22 according to product specifications, and then wound on the forming drum 24. It becomes.

At the same time, the sheet rubber 216 measures the width and gauge of the sheet rubber 216 by the rolled sheet width measuring device 25 and the online 3D profile scanner 26, and then feeds the measured values to the computer 27. Let's do it.

Here, the fed back values drive the mill gap adjusting device 28 up and down on the basis of the set value, and the cutter knife width adjusting device 29 interlocked with the cutter knife 23 to the left and right to adjust the width of the rolled sheet. The gauge will be adjusted.

The rolled sheet thus formed is stacked on the forming drum 34 to form a tread as shown in FIG. 2.

The present invention will be described in more detail based on Examples and Comparative Examples as follows.

Example

Rubber tread compounded with silica compound in the ratio of the following Table 1 to prepare a tire tread as shown in Figure 1 using a rolling tread molding machine. The results are shown in Table 2 and FIG. 4, respectively.

The rubber compound blended with silica compound in the ratio of the following Table 1 was prepared using a conventional extruder (pilot scale extruder) and the tire tread as shown in FIG. The results are shown in Table 2 and FIG. 5, respectively.

4 is a 3D profile measurement result of the tread cross section manufactured by the tread molding machine of the present invention, it can be seen that the tread cross section manufactured by the rolling tread molding machine is more accurately manufactured to the desired profile, Figure 5 is a gauge (tread height compared to the desired profile) ), You can see that the deviation is severe. 4 and 5, the upper part is a tread profile of the standard to be manufactured, and the lower part shows the deviation of the laser measurement value from the profile.

Compound type Example (PHR) Comparative Example (PHR) S-SBR (1) 96.25 96.25 Ni-BR (3) 20 20 Silica 80 80 Coupling Agent (Si69) 6.5 6.5 Softener (A # 2 Oil) 3 3 Zinc oxide 3 3 Stearic acid 2 2 Antioxidant 2 2 brimstone 1.5 1.5 Accelerator 1 1.4 1.4 Promoter 2 (DPG) 2 2

Item Example Comparative example Manufacturing temperature (℃) 106 143 Tread cross section error (%) 1.5 3.4 Extruded Width / Spec. (Mm) 227/225 229/225 Disposal rubber generated when changing the standard Less than 10 kg 150 kg

As can be seen from the results of Table 2 and the results of FIGS. 4 and 5, the embodiment according to the present invention has a lower manufacturing temperature, a smaller width / area / shape error than the specification of the comparative example, and a specification. It can be seen that the amount of waste rubber generated during replacement is significantly reduced.

The reason is that by using a rolled tread molding machine, the shrinkage and expansion effect of the rubber can be minimized, and the rolled rubber sheet is assembled to obtain a desired profile.

The reason why the waste rubber is significantly reduced is that the rolled tread molding machine can be used to remove and recover the compound without mixing the compound by removing the guide roll and stopping rubber supply when changing the compound size.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as set forth in the foregoing description. And variations are to be construed as falling within the scope of protection of the present invention.

20 ---- tire tread forming machine
21 ---- rolling mill
211 ---- first rolling
212 ---- second rolling mill
213 ---- third rolling mill
214 ---- Fourth Rolling Mill
215 ----- Rubber Bank
216 ---- sheet rubber
22 ---- Guide Roll
23 ---- cutter knife
24 ---- molding drum
25 ---- Rolled sheet width measuring device
26 ---- Online 3D Profile Scanner
27 ---- computer
28 ---- Mill gap regulator
29 ---- cutter knife width adjuster

Claims (4)

A plurality of hot rolling mills 21 for heating the rubber compound material in multiple stages to take out rubber in a sheet form;
A cutter knife 23 for cutting the rolled thin sheet rubber 216 drawn out from the rolling mill 21 to a desired width according to a product specification; And
Rolled tire tread forming machine (20), characterized in that composed of a forming drum (24) for laminating the cut rolled thin sheet rubber one by one. The method according to claim 1,
The plurality of hot rolling mills 21 are arranged to be in contact with each other, and the first rolling mill 211 and the second rolling mill 212 for drawing out a rolled rubber sheet primarily through a gap while rotating in opposite directions. And the third rolling mill 213, the fourth rolling mill 214, and the rolling mills 211 and 213 are rotated in the opposite direction, and are coupled to each other while rotating in a state where the first rolled rubber sheet is attached to the gap. And a second rolling mill (212) and a third rolling mill (213) for drawing out the rolled rubber sheet from the secondary.
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