JPH07112707B2 - Heating method for heating rolls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is arranged during a process of molding and processing a plastic film, a rubber sheet, etc., and a heating medium is supplied to raise the temperature to heat the material. The present invention relates to a heating method suitable for various heating rolls.

[Prior Art] During the process of molding and processing a plastic film, a rubber sheet, etc., a calendar roll or a mixing roll, a film or a sheet material, which is provided in a preceding stage of the calendar roll and further kneads materials supplied from a kneader. There are various rolls such as a mill roll for crushing into flakes, a roll for only heating, and a roll for cutting. And these rolls are designed to be heated to improve their processability. As a heating method, steam, hot water, a heating medium such as hot oil is circulated in the roll to raise the temperature of the roll surface to the processing temperature of the material, for example, in the case of plastic, approximately 180 to 250 ° C. About 80 for rubber
It is necessary to raise the temperature to about 120 ° C.

[Problems to be Solved by the Invention] By the way, in the prior art, there was a problem that a large amount of heat was dissipated and a large loss of heat energy was caused because heating was performed with the roll exposed to the atmosphere side. In particular, it took a long time to raise the temperature of the cold roll surface to a predetermined temperature before starting the roll operation.

Here, it is conceivable to increase the circulating supply amount of the heat medium in order to shorten the temperature raising time, but there is a problem that the capacity of the heating means and the circulation pump must be increased in order to secure the supply amount. .

Therefore, it is desired to devise a heating method that can raise the temperature of the roll surface in a short time with a small amount of heat medium supply and that can suppress the loss of heat energy even during the roll operation.

[Means for Solving the Problems] In the present invention, when the heating medium for molding / processing a material such as a plastic film is heated by supplying a heating medium such as hot water, the heating roll is insulated. A cover having a heat-resistant property, and an opening / closing door is provided at the material feeding portion and the material feeding portion of the heating roll of the cover, and heat is applied to the heating roll with the opening / closing door closed before supplying the material to the heating roll. A medium is supplied to heat the heating roll, the surface temperature of the heating roll reaches a predetermined temperature, and when the material is supplied to the heating roll, the opening / closing door is opened to heat the heating roll. Is.

[Operation] According to the above configuration, the warming-up time can be shortened by heating the heating rolls with the opening / closing door closed before the material is charged, and the temperature of all the heating rolls can be reduced by covering the entire heating rolls. Becomes uniform and thermal strain is suppressed.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In this embodiment, a plastic film or the like is molded.
As a heating roll which is arranged in the process of treating and which is heated by heating medium such as steam, hot water or hot oil to heat its surface, the calendar roll 1 having an inverted L-shaped arrangement is shown in FIG.
The mixing roll 2 is shown in the figure.

Each of the rolls 1 and 2 has a roll body 3 rotatably attached to a frame 4, and inside each roll 3,
A conduit portion 5 is formed in which a heat medium for heating the material by heating the roll surface is circulated.

The rolls 1 and 2 configured in this manner include the rolls 1 and 2 so as to surround the roll surface for molding and processing the material.
Covers 6 and 7 are provided to cover the whole. The covers 6 and 7 are formed by adhering a heat insulating material or the like to the inner surface thereof in order to regulate heat radiation, and are formed with a contour that is substantially along the outer shape of the roll and is spaced from the roll surface.

Since the calender roll 1 is provided with the take-off roll 8 for feeding the material, the cover 6 is formed with the delivery port 10 which is always open at the material feeding portion 9 of the roll 1.

Further, particularly in the calendar roll 1, it is important to monitor the bank portion 11. However, if the entire roll 1 is covered with the opaque cover 6, the bank portion 11 cannot be monitored. A transparent cover 6a is used as the cover of the portion facing the portion 11 so that the bank portion 11 can be seen through.

Further, the covers 6 and 7 configured as described above are provided with detachable opening / closing doors 13 that open at least the material feeding portion 12 and the material feeding portion 9 of the rolls 1 and 2 to the atmosphere side. The opening / closing door 13 constitutes the cover 6, and includes a feeding portion 12 and a feeding portion 9.
Even if the cover 6 part that covers the rolls 1 and 2 other than the above is detachably configured, as shown in FIG.
14 may be used to open both sides or open one side. Further, it may be configured to be slidable along the cover 13 so that the input portion 12 and the delivery portion 9 can be opened and closed.

When the rolls 1 and 2 are operated, the opening / closing door 13 is covered by the cover 6 at the time of warming up before the material is charged.
To cover the rolls 1 and 2 by blocking them from the atmosphere side and supplying a heat medium to heat them. After that, when the roll surface temperature reaches a predetermined temperature and the material is supplied to the rolls 1 and 2, the opening / closing door 13 is removed to open at least the material feeding portion 12 and the material feeding portion 9 to the atmosphere side, and other Heating is performed with the roll portion covered.

By the way, by doing the above, it is possible to suppress the heat radiation from the rolls 1 and 2 to the atmosphere side as much as possible to reduce the loss of thermal energy, and in particular, it is possible to shorten the roll temperature raising work time before material supply and to heat the heating rolls. By covering the whole of the above, the temperature of all heating rolls becomes uniform, and thermal strain can be suppressed. Further, even during operation, only the necessary parts such as the material feeding part 12 and the material sending part 9 are opened, so that the loss of heat energy can be suppressed. In addition, covering the rolls 1 and 2 restricts the emission of mist scattered around the rolls 1 and 2 from the material that is put into the rolls 1 and 2 during the molding and processing of plastic films, etc. The work environment can be improved. Also, since it covers the hot rolls 1 and 2, it is highly safe.

In the present embodiment, the cover portion 6a facing the bank portion 11
Is transparent, the bank section 11 can be appropriately managed.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

Before heating the material, the heating roll can be heated with the open / close door closed to shorten the warming-up time, and by covering the entire heating roll, the temperature of all heating rolls becomes uniform and thermal distortion is suppressed. . Further, since the open / close door is opened and heating is performed in the state where only the material feeding portion and the material feeding portion are opened, it is possible to suppress the heat radiation from the heating roll to the atmosphere side as much as possible and reduce the loss of heat energy.

[Brief description of drawings]

FIG. 1 is a side view showing an example in which the present invention is applied to a calendar roll, and FIG. 2 is a side view showing an example in which the present invention is applied to a mixing roll. In the figure, 1 and 2 are calendar rolls and mixing rolls illustrated as heating rolls, 9 is a material feeding portion, and 12 is a material feeding portion.

Claims (1)

[Claims] 1. When supplying and heating a heating medium such as hot water into a heating roll for molding and processing a material such as a plastic film, the heating roll is covered with a heat insulating cover and An opening / closing door through which a material can pass is provided in the material feeding portion and the material feeding portion of the heating roll of the cover, and before supplying the material to the heating roll, the heating medium is applied to the heating roll with the opening / closing door closed. After supplying and heating this, after heating the surface temperature of the heating roll to a predetermined temperature, when supplying the material to the heating roll, the opening and closing door is opened to heat. Heating method for heating rolls.