JP2011224935A - Rolling device of unvulcanized rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling device of an unvulcanized rubber capable of effectively reducing rubber burning of a rubber sheet or adhesion to a calender roll.SOLUTION: The unvulcanized rubber is continuously rolled by using three or more calender rolls, temperatures of the respective calender rolls are independently adjusted respectively, the final calender roll 4 has the highest temperature and the intermediate calender roll 3 has the lowest temperature.

Description

  The present invention relates to a rolling device for unvulcanized rubber, and more particularly to a rolling device for unvulcanized rubber that rolls unvulcanized rubber with a calendar device.

  When molding the unvulcanized rubber, the uncured rubber sheet is rolled and molded with a calendar device, and a thin unvulcanized rubber sheet with a certain thickness is laminated and the calender device is composed of three or more calender rolls controlled at a certain temperature. It has been common to roll and mold unvulcanized rubber.

  However, in such an unvulcanized rubber rolling apparatus, particularly when bromobutyl having a flat clay as a filler is used for the unvulcanized rubber, the unvulcanized rubber is rolled with a calender roll, and the temperature of the rubber is measured. However, when the temperature of the rubber is lowered, the rubber is not easily adhered to the final calender roll and the productivity may be reduced. .

  Then, this invention is providing the rolling apparatus of the unvulcanized rubber which can reduce effectively the rubber | gum burning and adhesion | attachment of the rubber sheet to a calender roll in the rolling apparatus of unvulcanized rubber.

  The unvulcanized rubber rolling device of the present invention is formed by continuously rolling unvulcanized rubber with three or more calender rolls, and independently adjusting the temperature of each calender roll to obtain a final roll. The calender roll has the highest temperature and the intermediate calender roll has the lowest temperature.

Here, the intermediate calendar roll may be a plurality of calendar rolls, and means all calendar rolls positioned between the first and last calendar rolls.
The arrangement of the calendar rolls can be an upright type, a V type, an L type, a Z type, or the like.

  In such an unvulcanized rubber molding apparatus, the surface temperature of the calender roll is more preferably in the range of 50 to 85 ° C.

  In the unvulcanized rubber rolling device of the present invention, the temperature of the calender rolls is adjusted to make the final calender roll the hottest and the intermediate calender roll the coldest, so that the first calender roll is the rubber sheet. The rubber sheet is cooled with the next intermediate calender roll to stop the reaction such as vulcanization to reduce the rubber burn and heated with the final calender roll to vulcanize the rubber sheet. By performing the reaction such as again, adhesion to the calendar roll can be reduced. As a result, the productivity of unvulcanized rubber can be improved without reducing the rubber properties.

It is a side view showing typically one embodiment of a rolling device of unvulcanized rubber of the present invention.

The unvulcanized rubber rolling apparatus of the present invention will be described in detail below with reference to the drawings.
In the unvulcanized rubber rolling apparatus 1 shown in the figure, a first calendar roll 2 located in the upper part of the figure, a second calendar roll 3 located in the lower left part of the first calendar roll 2, and this second calendar roll 3 and the third calendar roll 4 located immediately below 3 are arranged in a V shape, and the adjacent calendar rolls rotate in different directions.

Here, the calender rolls are adjusted so that the adjacent calender rolls have a very small gap between each other in order to produce a rubber sheet with a uniform thickness. A large force is applied to the surface, and the rubber thickness can be reduced.
Further, since the rubber sheet is formed thinly without containing bubbles, the surface speed of the calendar roll can be made different from each other.

  Such a rolling device 1, for example, sandwiches and rolls the unvulcanized rubber G between the first calender roll 2 and the second calender roll 3 and moves the rubber along the second calender roll 3. Next, the rubber sheet that has been thinned by being sandwiched and rolled between the second calender roll 3 and the third calender roll 4 is conveyed to the next process via the auxiliary roll 5.

  And in this rolling device 1, the temperature of each calendar roll is adjusted independently, respectively, and the final calendar roll, the third calendar roll 4 in the figure is the highest temperature, the intermediate calendar roll, the second calendar roll 3 in the figure. Is the lowest temperature.

  In such a rolling apparatus 1, the surface temperature of the calender roll is more preferably in the range of 50 to 85 ° C., and by making it within this range, the adhesion with the calender roll is reduced without the unvulcanized rubber being burned. can do.

  More preferably, in such a rolling apparatus 1, the surface temperature of the first calender roll 2 is 60 to 70 ° C., the surface temperature of the second calender roll 3 is 50 to 70 ° C., and the surface of the third calender roll 4. The temperature is in the range of 75 to 85 ° C., and with this configuration, the second calender roll 3 is rolled while preventing rubber burning, the third calender roll 4 is improved in peelability, and the surface temperature of the first calender roll 2 is As a constant surface temperature intermediate between the surface temperatures of the second calender roll 3 and the third calender roll 4, the viscosity of the rubber can be lowered to improve the rolling.

  The temperature control of each calendar roll can be set, for example, by circulating hot water inside the calendar roll.

Such a rolling device 1 is preferably applied when producing an unvulcanized inner liner rubber used in a pneumatic heavy load radial tire for construction vehicles.
The inner liner rubber is wide and needs a certain thickness and is difficult to manufacture with a normal rolling apparatus, but the rolling apparatus 1 can stably manufacture a rubber sheet.

Next, using a rolling apparatus for unvulcanized rubber having a structure as shown in FIG. 1, bromobutyl rubber containing flat clay as a filler is kneaded, and the rubber thickness × width is set to 2.5 mm × 600 mm. As shown in Table 1, for each of Example Rolling Devices 1 and 2 and Comparative Example Rolling Devices 1 to 3 in which the respective specifications were changed, rubber burnability, rubber properties and adhesion were measured.
In addition, since the comparative example rolling apparatus does not require modification other than the temperature of the calender roll, it was assumed to conform to the example rolling apparatus.

[Rubber scorch]
For each of Example Rolling Apparatuses 1 and 2 and Comparative Example Rolling Apparatuses 1 to 3, the unburned rubber that was rolled was measured for rubber scorch using scorch time. The evaluation results are shown in Table 2.
In addition, the value in a table | surface shows the value of the comparative example rolling apparatus 1 as a parameter | index.

[Rubber properties]
For each of Example Rolling Apparatuses 1 and 2 and Comparative Example Rolling Apparatuses 1 to 3, the rolled unvulcanized rubber was measured for surface roughness using a surface roughness meter. The evaluation results are shown in Table 2.
In addition, the value in a table | surface shows the value of the comparative example rolling apparatus 1 as a parameter | index.

[Adhesion]
For each of Example Rolling Devices 1 and 2 and Comparative Example Rolling Devices 1 to 3, the adhesion of the rolled unvulcanized rubber was measured visually and with a tack meter. The evaluation results are shown in Table 2.
In addition, the value in a table | surface shows the value of the comparative example rolling apparatus 1 as a parameter | index.

From the results of Table 2, the Example rolling apparatuses 1 and 2 were able to be improved together with the rubber scorch, rubber properties and adhesion with respect to the Comparative Example rolling apparatuses 1 to 3.
Further, the comparative rolling device 1 was brought into an emergency stop due to the close contact with the third calendar roll. The rolling devices 1 and 2 were able to work satisfactorily without reducing the close contact and performing an emergency stop.

DESCRIPTION OF SYMBOLS 1 Rolling apparatus of unvulcanized rubber 2 First calendar roll 3 Second calendar roll 4 Third calendar roll 5 Auxiliary roll

Claims (2)

In the unvulcanized rubber rolling device formed by continuous rolling of unvulcanized rubber with three or more calender rolls,
An unvulcanized rubber rolling apparatus, wherein the temperature of each calender roll is independently adjusted so that the final calender roll has the highest temperature and the intermediate calender roll has the lowest temperature.   The rolling apparatus for unvulcanized rubber according to claim 1, wherein the surface temperature of the calender roll is in the range of 50 to 85 ° C.

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