KR101303710B1

KR101303710B1 - Method for mixing rubber

Info

Publication number: KR101303710B1
Application number: KR20100130795A
Authority: KR
Inventors: 정원준
Original assignee: 한국타이어 주식회사
Priority date: 2010-12-20
Filing date: 2010-12-20
Publication date: 2013-09-03
Also published as: KR20120069299A

Abstract

Rubber mixing apparatus and methods are provided.
The rubber mixing device may include a mill including a first roller and a second roller, and a current meter for measuring and displaying a mill current value, wherein the mill current value is a current applied to the mill during operation of the mill. It can represent a value.
The rubber mixing method is a method of mixing rubber using the rubber mixing device, setting an initial mill condition for the mill, inputting a reference current value and a target current value to the current meter, the mill Injecting a rubber into the first milling step, Measuring the mill current value of the mill, Comparing the mill current value and the reference current value by the rotational speed of the first roller and the second roller or the first Adjusting a gap between the roller and the second roller, performing a second milling until the mill current value reaches the target current value, and after the mill current value reaches the target current value Reducing the mill condition to the initial mill condition and then performing third milling.

Description

Rubber mixing method {METHOD FOR MIXING RUBBER}

The present invention relates to a rubber mixing apparatus and method, and more particularly to a rubber mixing method that can make the physical properties of the rubber compound uniform.

In the tire manufacturing process, the rubber mixing process is the process of making each compound used in the semifinished product for tire production. There are two main methods for mixing rubber compounds. The first is the mixing method through shear stress of the rotor in the halfbarrow mixer chamber with internal mixing through a commonly used Banbury mixer. The second is a mixing method through a shear stress given when passing through a circular mill in an open state in air using a mill including a pair of rollers.

It is advantageous to control the rheology, such as the viscosity and viscoelasticity of the rubber, by mixing the mill at low temperatures. However, if the mill mixing simply controls the mixing time, it may cause variations due to mill conditions such as mill gaps or milling speeds, making it difficult to analyze trends in changes in rubber viscosity and inconsistent quality of rubber formulations. have.

In order to solve the above problems, the present invention provides a rubber mixing apparatus and method capable of making the physical properties and quality of the rubber compound uniform in mill mixing.

The rubber mixing apparatus according to embodiments of the present invention includes a mill including a first roller and a second roller, and a current meter for measuring and displaying a mill current value. The mill current value represents a current value applied to the mill during operation of the mill.

The rotation speed of the first roller and the second roller or the distance between the first roller and the second roller may be adjusted according to the mill current value. The mill is controlled by the current meter so that the rotational speed and the interval can be automatically adjusted.

Rubber mixing method according to embodiments of the present invention, a method of mixing rubber using the rubber mixing device, the step of setting the initial mill conditions for the mill, the reference current value and the target current value in the current meter Inputting a step, putting rubber into the mill to perform a first milling, measuring a mill current value of the mill, comparing the mill current value with a reference current value, and comparing the first roller and the second roller. Adjusting the rotational speed or the interval between the first roller and the second roller, performing a second milling until the mill current value reaches the target current value, and the mill current value being the Reducing the mill condition to the initial mill condition after reaching a target current value and then performing third milling.

If the mill current value is greater than the reference current value, the rotation speed may increase or the interval may be narrowed. If the mill current value is not greater than the reference current value, the rotation speed may decrease or the interval may be widened. Can be.

According to embodiments of the present invention, it is possible to make the physical properties and quality of the rubber mixture discharged after being mixed in the open mill uniform.

1 is a view for explaining a rubber mixing device according to an embodiment of the present invention.
2 is a flowchart illustrating a rubber mixing method according to an embodiment of the present invention.
3A is a graph showing the relationship between the mill gap and the Mooney viscosity reduction amount, and FIG. 3B is a graph showing the relationship between the Mooney viscosity and the mill current value.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The objects, features, and advantages of the present invention will be readily understood through the following embodiments related to the accompanying drawings. The present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the invention to those skilled in the art.

1 is a view for explaining a rubber mixing device 100 according to an embodiment of the present invention.

Referring to FIG. 1, the rubber mixing apparatus 100 includes a mill 110 for mixing a rubber compound and a current meter 120 for measuring and displaying a current value (mill current value) applied to the mill during mill operation. do. The mill 110 includes a first roller 111 and a second roller 112. In FIG. 1, V denotes the rotational speed of the first roller 111 and the second roller 112 as milling speed, and G denotes the gap between the first roller 111 and the second roller 112 as the mill gap. Indicates.

In mill mixing, the shear rate can be expressed in V / G, and the total shear strain can be found by multiplying the shear rate by the total applied time. If the time is applied equally in mill mixing, the total shear deformation the rubber receives is the faster the milling speed (V). It can be seen that the smaller the mill gap G is, the larger it becomes. Therefore, the shear strain amount is largely applied to the rubber having a large viscosity value, and the shear strain amount is small applied to the rubber having a small viscosity value, so that the rubber viscosity value can be uniform in mill mixing. In order to determine how much shear deformation should be applied, a factor for displaying the viscosity in real time at the time of mill mixing is required, and in this embodiment, a mill current value is used. When the rubber in the hard state enters the mill 110, the load on the mill 110 is considerably high, and as the milling continues, the rubber changes to a soft state and the load on the mill 110 is also reduced. In this way, the load value applied to the mill can be known through the current value, through which the rubber viscosity can be known.

3A is a graph showing the relationship between the mill gap and the Mooney viscosity reduction amount, and FIG. 3B is a graph showing the relationship between the Mooney viscosity and the mill current value. Referring to FIG. 3A, the Mooney viscosity decrease is linearly changed as the mill gap is changed, and the correlation coefficient is 0.9779. Referring to FIG. 3B, the mill current value changes linearly as the Mooney viscosity changes, and the correlation coefficient is 0.9895. That is, the mill gap and the Mooney viscosity reduction amount show a very high level of correlation, and the Mooney viscosity and the mill current value show a very high level of correlation. Therefore, the viscosity value of the rubber compound can be detected by using the mill current value at the time of mill mixing, and when the mill condition is controlled by feeding back the mill condition reflecting the detected viscosity value, the wheat mixing is finally completed. The physical properties of the rubber compound can then be made uniform.

2 is a flowchart illustrating a rubber mixing method according to an embodiment of the present invention.

1 and 2, initial mill conditions such as milling speed V and mill gap G are set for the open mill 110 to perform rubber mixing. The reference current value and the target current value are input to the current meter 120. When rubber is injected into the mill 110, the mill 110 performs the first milling, and the current meter 120 scans the mill current value. If the mill current value is greater than the reference current value, the mill 110 performs a second milling by narrowing the mill gap G or increasing the milling speed V, and if the mill current value is not greater than the reference current value, the mill 110 widens the mill gap G or lowers the milling speed V to perform second milling. In one embodiment, the current meter 120 may automatically control the mill 110 by comparing and determining the mill current value and the reference current value. That is, the mill 110 is controlled by the current meter 120 so that the milling speed V and the mill gap G can be automatically adjusted. In another embodiment, the rubber mixing device 100 may further include a controller (not shown) capable of automatically controlling the mill 110 and the current meter 120.

The second milling is continued until the mill current value reaches the target current value. When the mill current value reaches the target current value, mill conditions such as milling speed V and mill gap G are reduced to the initial mill conditions, and mill 110 performs third milling. As such, the third milling is performed after the mill current value reaches the target current value, that is, after the viscosity of the rubber compound reaches a certain value, whereby the physical properties and the quality of the discharged rubber compound can be made uniform.

Hereinafter, specific embodiments of the present invention have been described. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: rubber mixing device
110: wheat
120: current meter

Claims

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A method of mixing rubber using a rubber mixing device having a mill including a first roller and a second roller, and a current meter for measuring a mill current value applied to the mill during mill operation,
Setting an initial mill condition for the mill;
Inputting a reference current value and a target current value into the current meter;
Injecting rubber into the mill to perform first milling;
Measuring a mill current value of the mill;
Comparing the mill current value with a reference current value to adjust a rotational speed of the first roller and the second roller or a gap between the first roller and the second roller;
Performing second milling until the mill current value reaches the target current value; And
After the mill current value reaches the target current value, reducing the mill condition to the initial mill condition and then performing third milling,
In the step of performing the first milling, if the mill current value is greater than the reference current value, the rotational speed increases or the interval becomes narrow,
And in the step of performing the first milling, if the mill current value is not greater than the reference current value, the rotational speed is reduced or the interval is widened.

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