JPH03173614A - Controlling method for temperature of roll and device therefor - Google Patents

Abstract

PURPOSE:To rise the roll temperature, improve the bonding properties of resin with the rolls and release the resin from the rolls by forming two or more heat transfer medium flow paths of different structure concentrically in the longtudinal direction of rolls in the circumferential direction of rolls, flowing heat transfer mediums of different temperature into respective heat transfer medium paths and controlling the temperature of rolls. CONSTITUTION:Molten resin extruded by an extruder 1 is formed into a sheet by means of a die 2. A first pressure roll 3 is connected with a heating and cooling device 6, and a second pressure roll 4 is connected with heating and cooling devices 7 and 8, while a third pressure roll 5 is connected with heating and cooling devices 9 and 10 respectively, and temperature-adjusted heat transfer medium is circulated in respective pressure rolls and heating and cooling devices to control the temperature of pressure rolls. A second heat transfer flow path 26 is formed in the circumferential direction close to the surface of the second pressure roll 4 on the outside of first heat transfer medium flow path 20 formed cylindrically in said second pressure roll 4, and communicated with a second heat transfer medium flow path 24 formed on an end small diameter section 15 along the longitudinal direction through a communicating path 25 in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for controlling the temperature of rolls in rolling forming of synthetic resins, glass, iron, etc.

[Prior art and its problems]

Generally, in roll forming, a plurality of rolls are used, and the roll temperature is controlled for each roll. For example, in rolling sheet molding of synthetic resin, the temperature of the rolls is controlled on a roll-by-roll basis using dedicated heating and cooling devices for each of the 10th, 20th, and 30th rolls.

In order to improve the surface gloss of the rolled sheet,
It is necessary to improve the transfer of the mirror surface of the roll onto the resin. In order to do this, it is necessary to raise the temperature of the roll to improve the adhesion of the resin to the roll, but if the temperature of the roll is too high, the adhesion of the resin to the roll is too large and it is difficult to release the mold from the roll. There is a problem that it becomes impossible to form a rolled sheet.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method and apparatus for controlling the temperature of a roll, which increases the temperature of the roll, improves the adhesion of the resin to the roll, and makes it possible to release the resin from the roll. It is.

[Failure to solve the problem]

In order to achieve the above-mentioned object, the roll temperature control method and device according to the present invention includes at least two or more types of heating medium having different configurations in the roll in the circumferential direction and concentrically in the longitudinal direction of the roll. The device is characterized in that the temperature of the roll is controlled by forming a flow path and causing heat mediums having different temperatures to flow into each of the heat medium flow paths, and as a device for controlling the temperature of the roll. A large number of heat medium flow paths are formed at equal intervals in the longitudinal direction of the heat medium flow path, and a cylindrical heat medium flow path is formed concentrically with the heat medium flow path inside the heat medium flow path. The feature is that the temperature of the roll is controlled by allowing heating mediums having different temperatures to flow into the heating medium flow paths.

[Effect]

The roll temperature control method and device according to the present invention include forming at least two or more types of heat medium flow paths having different configurations in the circumferential direction and concentrically in the longitudinal direction of the roll, and By allowing heat medium with different temperatures to flow into the heat medium flow path, it is possible to finely adjust the temperature of the roll, and the gloss of the surface of the sheet product and the adhesion of the resin to the roll can be adjusted. .

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an apparatus according to an embodiment of the present invention shown in the drawings will be described.

FIG. 1 shows a configuration diagram of this embodiment, in which 1 is an extruder that melts and extrudes resin, and the molten resin extruded by the extruder is shaped into a sheet 1 by a die 2. . 3 is a first rolling roll, 4 is a second rolling roll, 5 is a third rolling roll, 6 is a heating cooler for the first rolling roll 3,
7 and 8 are heating/cooling devices for the second rolling roll; 9 and 10 are heating/cooling devices for the third rolling roll;
is connected to a heating cooler 6, the second rolling roll 4 is connected to heating coolers 7 and 8, and the third rolling roll 5 is connected to heating coolers 9 and 10, respectively, so that the temperature-adjusted heating medium is connected to each rolling roll. The temperature of the rolling rolls is controlled by circulating the rolls through a heating and cooling device.

The sheet-shaped resin described above is rolled by a first rolling roll 3 and a rolling roll 4, and then rolled by a second rolling roll 4 and a third rolling roll 5.
The sheet product 11 is given a glossy surface and is wound up via a take-up roll 12.

To explain the inflow of the heating medium into the rolling rolls using the second rolling roll 4 shown in FIGS. 2 and 3 as an example, reference numerals 13 and 14 are fixed heating medium inflow joints and heating medium discharge joints. A second rolling roll 4 is provided at each of the heat medium inflow joint 13 and heat medium discharge joint 14.
Small-diameter portions 15 and 15' at both ends are loosely inserted through a bearing 16 and a seal 17 so as to be freely rotatable.

Reference numeral 19 denotes a first hole bored in the heat medium inflow junction 13 described above.
This is a heat medium inlet, and the first heat medium flow population 19 has a cylindrical shape 20' at the small diameter end 15 of the second rolling roll 4, and one cylindrical shape inside the second rolling roll 4. The first heat medium flow path 20 is connected to a first heat medium flow path 20 formed in the heat medium discharge joint 14.
It communicates with the heat medium outlet 21 . Therefore, the first heat medium 18 whose temperature has been controlled by the heating/cooling device 7 is
One cylindrical first heat medium flow path 2 formed in the second rolling roll 4 flows into the first heat medium flow passage 19 provided in the second rolling roll 4.
0, the temperature of the second rolling roll 4 is adjusted, and the heat medium is returned to the heating/cooling device 7 through the first heat medium outlet 21 formed in the heat medium discharge joint 14.

Reference numeral 23 denotes a second heat medium inlet opened vertically in the heat medium inflow joint 13, and the second heat medium flow port 23 from the vertical direction is connected to the upper part of the heat medium flow joint 13. (see FIG. 3(N)), which communicates with 174 circular arc-shaped second heat medium flow paths 24' formed on the circumference), and furthermore,
' is a plurality of second heat medium channels 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24. ...... (see Fig. 3 (c)), and the second heat medium flow path 24.24.2.
4. . . . in the second rolling roll 4, outside the cylindrical first heat medium flow path 20, near the surface of the roll 4 in the circumferential direction and along the longitudinal direction. The second heat medium flow path 24.24 formed in the end small diameter portion 15.・・・・・・
. . . communicated with the second heat medium flow path 26.26.26 through the vertical communication path 25.25° .
・See FIG. 3 (I+), (A)), the second heat medium flow path 26.26.26. . . . are vertical communication paths 25', 25', .
The flow path 2'L in the small diameter end portion 15' through...
The second heat medium outlet 27 is connected to the arcuate second heat medium flow path 26 formed in the heat medium discharge joint 14 through the second heat medium outlet 2'L, .
is communicated with.

Therefore, the second heat medium 22 whose temperature is controlled by the heating/cooling device 8 is transferred from the second heat medium flow path 23 to the arc-shaped second heat medium flow path 24'.
The second heat medium flow paths 2424 are bored at equal intervals along the circumference of the end small diameter portion 15 of the second rolling roll 4 and are connected to the arc-shaped second heat medium flow path 24'. , 24.・・・・・・
The flow paths 24, 24, 24, . . . communicate with each other as the second rolling roll 4 rotates. . . . is a vertical communication path 25.25.25. A large number of second heat medium flow paths 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26 have, are are are not 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26.
... to adjust the temperature of the second rolling roll 4, and a flow path 24 formed in the small diameter portion 15' at the roll end. , 24.
.

248. . . . and then returned to the heating/cooling device 8 from the second heat medium outlet 27.

Further, the third rolling roll 5 also has the same configuration as the second rolling roll 4 described above, and the temperature of the third rolling roll 5 is adjusted by allowing separate heating mediums to flow in from heating coolers 9 and 10. There is.

Note that the first rolling roll 3 is the second rolling roll 4 described above.
1910 and 21 which are the heat medium flow paths of the first heat medium 18 in
Only a flow path corresponding to the above is formed.

Figures 4, 5, and 6 show that using the apparatus of this embodiment, acrylic resin is used as the synthetic resin, a sheet-shaped molten resin is extruded from a die, and a sheet is formed using a three-roll method under different conditions. An example is shown below.

In the example shown in FIG. 4, the first rolling roll 3 is connected to a heating/cooling device 6, the second rolling roll 4 is connected to a heating/cooling device 7, and the third rolling roll 5 is connected to a heating/cooling device 9. The heating medium corresponding to the first heating medium 18 described above is caused to flow into the flow path 20 corresponding to the cylindrical first heating medium flow path 20 formed in each roll, and the temperature of the heating medium at this time is When the temperature was set to 90°C, the release of the resin from the roll was smooth, but
The adhesion of the resin to the roll was insufficient, and the surface gloss of the sheet product was also insufficient.

Therefore, in order to improve the surface gloss, the second rolling roll 4
The temperature of the heating medium of the heating/cooling device 7 connected to the heating/cooling device 9 connected to the third rolling roll 5 is increased to 150°C, and the mounting on the second and third rolling rolls 4 and 5 is increased. As a result, as shown in Fig. 5, the release of the resin from the second and third rolling rolls 4.5 became poor, and the wavy appearance defect that occurred when the resin was released from the rolls caused the surface of the sheet product to deteriorate. The remaining appearance became poor.

Therefore, the second rolling roll 4 and the heating/cooling device 8, and the third rolling roll 5 and the heating/cooling device 10 are newly connected, and the temperature of the heating medium is set to 90°C from each heating/cooling device 8.10.
Second heat medium flow paths 26 formed at equal intervals in the circumferential direction near the outer surface of the inside of the second and third rolling rolls.
26.26. When the temperature of the rollers is controlled by flowing the second heating medium into..., the second and third rolling rollers 4
, 5 have longitudinal second heat medium passages 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26.
26. . . . temperature control by inflow of a 90°C heating medium into the second heating medium flow path 26.26.26. ...
Two types of temperature control are provided, one in which a 150°C heat medium is introduced into a single cylindrical first heat medium flow path 20 formed inside the As shown, the second. The mold release of the resin on the third rolling roll 4.5 was good, and the surface appearance of the sheet product also had excellent gloss.

Above, in this embodiment, it has been described that the position of the roll in the circumferential direction is controlled using two types of temperatures, but if three or more types of temperatures are controlled in the same way, for example,
It becomes possible to finely adjust the balance between the gloss of the surface of the sheet product and the poor surface appearance due to excessive adhesion of the resin to the roll, and more desirable effects can be obtained.

0 [Effects of the Invention] The roll temperature control method and device according to the present invention have a plurality of heat medium channels formed in a longitudinal direction at equal intervals in the circumferential direction near the surface of the roll, and A cylindrical heating medium flow path is formed inside, and heating mediums with different temperatures are flowed into these reheating medium flow paths to control the roll temperature at two types of temperatures. Therefore, it is possible to finely adjust the balance between the gloss of the surface of the sheet product and the poor surface appearance due to excessive adhesion of the resin to the roll.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram of a roll temperature control device, FIG. 2 is a sectional view of a rolling roll and a heat medium inlet, and FIG. 3 (A) (D) (C) (,:)
(e) are A-A, B-B, and C-C2D in Figure 2, respectively.
D and E-E cross-sectional views are shown, FIG. 4 is an explanatory diagram showing the state of close contact between the resin and the roll when a 90°C heat medium is introduced from the first heat medium flow path, and FIG. 5 is a 150° FIG. 6 is an explanatory diagram similar to FIG. 4 when the heating medium C is introduced, and FIG. 6 is an explanatory diagram showing the state of close contact between the resin and the roll when the first and second heating mediums are used. 1: Extruder 2. Dice 3: First rolling roll 4: Second rolling roll 5: Third rolling roll 6.7, 8, 9.10: Heating cooler 18: First heating medium 20: First heating medium flow path 22: Second
heat medium

Claims (2)

[Claims] (1) At least two or more types of heat medium channels having different configurations are formed circumferentially within the roll and concentrically in the longitudinal direction of the roll, and the heat medium channels have different temperatures. A method for controlling roll temperature, comprising controlling the temperature of the roll by introducing a medium. (2) A large number of heat medium channels are formed in the roll in the circumferential direction and at equal intervals in the longitudinal direction of the roll, and a cylindrical shape is formed inside the heat medium channel concentrically with the heat medium channel. What is claimed is: 1. A roll temperature control device, characterized in that the temperature of the roll is controlled by forming heating medium flow paths having a shape of 1.5 mm, and controlling the temperature of the roll by causing heating mediums having different temperatures to flow into each of the heat medium flow paths.