JPH031135B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a calendar device.

As shown in FIG. 1, the conventional calender device alternately rotates heating rolls 1 to 4, which are successively arranged in an inverted L shape with their peripheral surfaces facing each other in order, in opposite directions. The thermoplastic resin 5 passed between the second heating rolls 1 and 2 is rolled into a sheet 6 while being sent in order to the third and subsequent heating rolls 3 and 4.
After this sheet 6 is sent to a cooling drum 8 via a guide roller 7 to be cooled, it is wound up by a winding roller 9. In this case, in order to make the sheet width of the wound sheet 6 constant, conventionally, both ends of the sheet 6 are cut with slitters 10 disposed on the left and right positions of the circumferential surface of the fourth heating roll 4, or
Alternatively, both ends of the sheet 6 were cut by a slitter 11 disposed at the rear end of the cooling drum 8. Then, in order to reuse the cut sheet scraps 12 and 13 as sheet raw materials, the sheet scraps 12 are directly returned onto the first and second heating rolls 1 and 2 by the return conveyor 14 (sheet edges Since the material 12 is in a heated state by the heating roll 4), on the other hand,
In the case of the sheet offcuts 13, they were transported by air to a Banbury mixer or mixing roll, pulverized, kneaded again, and then reused (because the sheet offcuts 13 were cooled by the cooling drum 8).

However, in the former case (when cut by the slitter 10), the width of the sheet on the heating roll 4 fluctuates, so a narrow portion is formed in the sheet scraps 12 and the sheet scraps 12 are cut during return by the conveyor 14. This caused the problem that the refund process could not be carried out smoothly. Moreover, in the latter case (when cut by the slitter 11), the sheet offcuts 13 must be transported by air and kneaded again, which poses a problem in that equipment costs such as air transportation and crushing equipment are high.

Therefore, an object of the present invention is to smoothly reuse sheet scraps as sheet raw materials,
To provide a calender device which can be completed at low equipment cost.

An embodiment of this invention will be explained using FIG. 2.
That is, as shown in the figure, this calender device consists of four heating rolls 1, 2, 3, and 4 that are successively arranged in an inverted L shape with their circumferential surfaces facing each other in order, and rotated alternately in opposite directions. A driving heating roll group is provided.
Then, the fourth heating roll 4 of this heating roll group
Left and right slits 15 and 1 are placed at the left and right positions on the circumferential surface of the
5' are arranged facing each other.

On the other hand, a threaded rod 16 parallel to the roll axis is arranged above the first and second heating rolls 1 and 2, and left and right stock guides 17 are connected to the reverse threaded portions provided at both ends of the threaded rod 16. 17' are screwed together. These left and right stock guides 17, 17' are connected to the threaded rod 1.
The forward and reverse rotations of the rollers 6 drive the rolls apart and toward each other in the roll axis direction along the roll circumferential surface, and between these left and right stock guides 17 and 17' and the first and second heating rolls 1 and 2. A resin stock recess 18 is formed using the steps. This threaded rod 16 is driven to rotate in forward and reverse directions by a motor 19 disposed at one end thereof.

Further, on the outside of the left slitter 15, inner and outer phototubes 20 and 21 are arranged in parallel to detect the sheet edge position 6a using changes in the amount of reflected light. When the position 6a is detected, the motor 19 is configured to drive forward and reverse rotation, respectively. In addition, a return conveyor (not shown) is arranged in front of the heating roll group to return the sheet scraps 12 cut by the slitters 15, 15' to the resin stock recess 18, and a return conveyor (not shown) is arranged in the rear of the heating roll group. , a guide roller 7, and a cooling drum (not shown) as in the conventional case. A take-up roller (not shown) is provided.

The operation is explained as follows. That is, the thermoplastic resin 2 is placed inside the resin stock recess 18.
2 is inserted and the heating rolls 1 to 4 are driven to rotate.
Then, the resin 22 passes between the first and second heating rolls 1 and 2, and then passes through the third and fourth heating rolls 3,
4, and is rolled into sheet 6.
and is cut on the circumferential surface of the fourth heating roll 4 near both ends thereof by slitters 15, 15'. The sheet 6' cut into a predetermined width is sent to the cooling drum by the guide roller 7 and cooled, and then wound into a cylindrical shape by the take-up roller. On the other hand, Slitsuta 15,
The sheet scraps 12 cut by 15' are returned to the resin stock recess 18 by the return conveyor and reused as resin raw materials.

In this case, the sheet end position 6a before sheet cutting
is detected by the inner and outer phototubes 20 and 21. That is, when the sheet end position 6a moves inward from the internal phototube 20 (the sheet width decreases),
The internal photocell 20 operates and the motor 19 rotates the threaded rod 20 in the forward direction, causing the left and right stock guides 1 to rotate.
7 and 17' are spaced apart from each other and the width of resin feeding between the first and second heating rolls 1 and 2 is increased, so that the sheet width on the circumferential surface of the fourth heating roll 4 is increased. Conversely, when the sheet end position 6a comes to the outside of the external phototube 21 (the sheet width increases), the external phototube 21 operates and the motor 19 rotates the threaded rod 16 in the opposite direction, causing the left and right stock guides to rotate. 17 and 17' approach each other and the width of resin feeding between the first and second heating rolls 1 and 2 is narrowed, so the sheet width around the fourth heating roll 4 is reduced. In this way, the sheet scrap material 12
The width is always automatically adjusted within a certain range.

In this way, the minimum width of the sheet scraps 12 can be determined by the arrangement position of the internal phototube 20, so by appropriately determining the position of the internal phototube 20 in advance, the sheet scraps 12 can always be kept wider than a predetermined width. By setting a large value, it is possible to prevent the sheet offcuts 12 from being cut during the return operation by the return conveyor, and the sheet offcuts 12 can be smoothly reused as sheet raw material. In addition, sheet scrap material 12
is not a cut of the cooled sheet 6,
The sheet scraps 1 are cut from the sheet 6 heated on the circumferential surface of the fourth heating roll 4.
The air transportation and crushing equipment mentioned in 2 are not required at all, and the equipment cost is also low.

Another embodiment of the invention is shown in FIG. That is, this calender device has left and right threaded rods 23 and 23' parallel to the roll axis arranged at left and right positions above the first and second heating rolls 1 and 2. , 23' are screwed to the left and right stock guides 24, 24', respectively, and left and right motors 25, 2 are attached to the outer ends of the left and right threaded rods 23, 23'.
5', these left and right motors 25, 2
5' drives the left and right threaded rods 23, 23' in forward and reverse rotation to rotate the left and right stock guides 24, 24'.
are configured to slide outward and inward along left and right threaded rods 23 and 23', respectively. On the other hand, on both sides of the left and right slitters 15 and 15',
Internal/external phototubes 26, 27 for detecting the left edge of the sheet and internal/external phototubes 26', 2 for detecting the right edge of the sheet.
7' respectively, and an internal
When the external phototubes 26 and 27 detect the sheet left end position 6a on the circumferential surface of the fourth heating roll 4, the left motor 25 is driven in forward and reverse rotation, respectively;
Internal/external phototube 26', 2 for detecting the right edge of the sheet
7' detects the sheet right end position 6b on the circumferential surface of the fourth heating roll 4, the right motor 25' is driven to rotate in forward and reverse directions, respectively. The other configurations are the same as those of the above embodiment.

As a result of this configuration, the inner and outer photocells 26 and 27 for sheet left edge detection are located at the sheet left edge position 6a.
When the left threaded rod 23 is detected, the left motor 25
is rotated forward and backward, and the left stock guide 24 is driven to slide outward and inward, respectively.
The width of the left sheet offcut 28 can be adjusted to a constant width.
In addition, the inner and outer photocells 26' for detecting the right edge of the sheet,
27' detects the seat right end position 6b, the right motor 25' drives the right threaded rod 23' in forward and reverse rotation to move the right stock guide 24' outward and outward, respectively.
Since it is slid inward, the width of the right sheet offcut 29 can be adjusted to a constant width. In this way, the left
As a result of being able to individually adjust the right sheet scraps 28, 29 to a constant width, the sheet scraps 28, 29 are even more difficult to cut than in the above embodiment, and the sheet scraps 28, 2
9 reuse work can be carried out smoothly. Other effects are similar to those of the above embodiment.

As described above, the calendar device of the present invention has
By alternately rotating a plurality of successively arranged heating rolls with their circumferential surfaces facing each other in opposite directions, the thermoplastic resin passed between the first and second heating rolls is sequentially transferred to the third and subsequent heating rolls. A group of heating rolls that roll while being fed to form a sheet, and a group of heating rolls disposed above the first and second heating rolls so as to be able to approach and separate from each other in the axial direction of the rolls along their circumferential surfaces. left and right stock guides having resin stock recesses formed therebetween, and left and right stock guides arranged opposite to each other on the left and right positions of the circumferential surface of the final heating roll to cut the sheet on the circumferential surface of the final heating roll near both ends thereof.・A right slitter, a return conveyor that sends the sheet scraps cut by the left and right slitter back to the resin stock recess, a sensor that detects the sheet end position before cutting the sheet, and a sheet cutter according to the detection signal of this sensor. Since the sheet scrap material is provided with a stock guide drive means for driving the left and right stock guides toward and away from each other so that the width of the scrap material becomes a predetermined width, the sheet scrap material can be smoothly reused as a sheet raw material. This has the effect of reducing equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional example, FIG. 2 is a perspective view of a main part of an embodiment of the present invention, and FIG. 3 is a perspective view of a main part of another embodiment. 1-4... heating roll, 6... sheet, 15,
15'... Slitter, 16, 23, 23'... Threaded rod, 17, 17', 24, 24'... Stock guide, 18... Resin stock recess, 19, 25, 2
5'...Motor, 20, 21, 26, 26', 2
7, 27'...Phototube, 22...Resin.

Claims (1)

[Claims] 1. By alternately rotating a plurality of successively arranged heating rolls with their circumferential surfaces facing each other in opposite directions, the thermoplastic resin passed between the first and second heating rolls is transferred to a third heating roll. A group of heating rolls that are sequentially fed into subsequent heating rolls and rolled to form a sheet, and a group of heating rolls disposed above the first and second heating rolls so as to be able to approach and separate from each other in the axial direction of the rolls along their circumferential surfaces. By doing so, the left and right stock guides with resin stock recesses formed between them and the final heating roll are arranged opposite to each other on the left and right positions of the circumferential surface of the final heating roll, and the sheet on the circumferential surface of the final heating roll is placed on the left and right stock guides. Left and right slits that cut near both ends,
A return conveyor that sends the sheet scraps cut by the left and right slitter back to the resin stock recess, a sensor that detects the position of the sheet edge before cutting the sheet, and a predetermined width of the sheet scraps according to the detection signal of this sensor. and stock guide driving means for driving the left and right stock guides toward and away from each other so that the width of the stock guides is the same as that of the left and right stock guides. 2. The stock guide driving means includes a threaded rod extending in the axial direction of the rolls above the first and second heating rolls, and having the left and right stock guides screwed into reverse threaded portions at both ends. , a motor that moves the left and right stock guides apart and close to each other by driving the threaded rod in forward and reverse rotation, and the sensor is arranged in parallel on the outside of either the left or right slitter. Claim 1, which is an internal/external phototube that drives the motor in forward and reverse rotations, respectively, by detecting the edge of the sheet.
Calendar device as described in section. 3. The stock guide driving means has left and right screws that are disposed at left and right positions above the first and second heating rolls and extend in the roll axis direction, and are screwed into the left and right stock guides, respectively. and left and right motors that slide the left and right stock guides outward and inward, respectively, by driving these left and right threaded bars in forward and reverse rotation, respectively. Internal and external phototubes for detecting the left edge of the sheet are arranged in parallel to the left of the slitter and drive the left motor in forward and reverse rotation by detecting the left edge of the sheet, and inner and outer phototubes are arranged in parallel to the right of the right slitter to drive the left motor in forward and reverse rotation, respectively. 2. The calendar device according to claim 1, comprising internal and external phototubes for detecting the right edge of the sheet, which drive the right motor in forward and reverse rotations, respectively, by detecting .