JPH0550489A - Extrusion manufacturing apparatus for synthetic resin plate and operating method thereof - Google Patents

Abstract

PURPOSE:To send a plate-shaped synthetic resin in a taking-over roll without applying tension to the plate-shaped synthetic resin and generating the suspension of the plate-shaped synthetic resin between a cooling glazing roll and a guide roll conveyor device and between guide rolls. CONSTITUTION:The interval between a guide roll conveyor device 3 and a cooling glazing roll 1 and the interval between guide rolls 4 are narrowed and the respective guide rolls 4 are rotationally driven. By rotationally driving the guide rolls 4, no tension acts on a plate-shaped synthetic resin 6 and the suspension of the plate-shaped synthetic resin 6 can be prevented because of said narrow intervals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin plate extrusion manufacturing apparatus and its operating method, and more particularly, to a cooling glazing roll for cooling and glazing a plate-shaped synthetic resin extruded from a die, The present invention relates to an improvement in the transport state of a plate-shaped synthetic resin between a plate-shaped synthetic resin and a take-up roll that receives the plate-shaped synthetic resin on the downstream side.

[0002]

2. Description of the Related Art Generally, a synthetic resin plate is prepared by extruding a synthetic resin heated and melted by an extruder from a T-shaped die, cooling it with a cooling glazing roll and performing glazing, and then passing it through a guide roll conveyor device. It is manufactured by taking out with a take-up roll, and then passing through a cutting device or the like to obtain a plate-like product having a predetermined size.

Conventionally, the cooling glazing roll and the take-up roll are rotatably driven by a motor, but the drive device is not connected to each guide roll of the guide roll conveyor device interposed between the two. The guide rolls are simply free to rotate by the bearings on both ends.

Further, if a large number of guide rolls are densely arranged, the total force required for idling all the guide rolls becomes large, and the resistance value when the plate-like synthetic resin passes above the guide rolls becomes large. Since the roll take-up force must be increased, the distance between the guide rolls is relatively large (usually 600 to 800 mm). Then, in order to prevent the plate-shaped synthetic resin from hanging down by its own weight between the guide rolls, the peripheral speed of the take-up roll is made larger than the peripheral speed of the cooling glossing roll, and the plate-shaped composite on the guide roll conveyor device is used. Transport is performed while applying tension to the resin.

[0005]

However, since the plate-shaped synthetic resin is cooled and solidified while the tension is generated, internal stress (strain) remains in the extrusion direction of the synthetic resin plate. For this reason, when the obtained synthetic resin plate is reheated and heat-formed, a large shrinkage occurs particularly in the extrusion direction, and the following problems occur.

(1) The size of the synthetic resin plate to be subjected to the heat-molding process must be set in consideration of heat shrinkage, and there is a difference in shrinkage rate between the extrusion direction and the width direction of the synthetic resin plate. , The direction must be clearly divided before performing the heat forming process, which makes the work complicated and troublesome.

(2) Since the shrinkage rate in the extrusion direction is large, the heat-molded product is distorted, which causes defective molding.

(3) When printing is performed on a synthetic resin plate after printing, shrinkage causes printing misalignment and distortion, resulting in poor appearance.

In order to solve such a problem, it is sufficient not to apply tension to the plate-shaped synthetic resin on the guide roll conveyor device. However, for example, if the ratio of the peripheral speed of the cooling glazing roll and the peripheral speed of the take-up roll is reduced, the plate-shaped synthetic resin hangs down by its own weight between the guide rolls and further between the cooling glazing roll and the guide roll conveyor device. As shown in FIG. 2, the plate-shaped synthetic resin becomes wavy. In FIG. 2, 1 is a cooling glossing roller, and 6 is a plate-like synthetic resin.

On the other hand, it is conceivable to prevent the sagging due to its own weight by reducing the distance between the guide rolls. However, as described above, increasing the number of guide rolls and narrowing the interval between the guide rolls increases the passage resistance of the plate-like synthetic resin, and the take-up roll cannot be taken off unless the take-up force of the take-up roll is increased. Eventually, tension will be applied to the plate-shaped synthetic resin.

Further, the guide rolls are closely arranged, and
It is also possible to shorten the guide roll conveyor device to prevent an increase in the number of guide rolls. However. This causes a disadvantage that the plate-shaped synthetic resin cannot be cooled sufficiently.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to apply tension to the plate-like synthetic resin, and further, between the cooling glazing roll and the guide roll conveyor device and between the guide rolls. An object of the present invention is to enable the plate-shaped synthetic resin to be sent to the take-up roll without causing the plate-shaped synthetic resin to hang down.

[0013]

To this end, in the invention of claim 1, a guide roll conveyor device 3 is provided between the cooling glazing roll 1 and the take-up roll 2, and the guide roll conveyor device 3 has the most cooling shine. The distance between the shaft of the guide roll 4 near the mounting roll 1 and the shaft of the cooling glazing roll 1 and the distance between the shafts of the adjacent guide rolls 4 are each 500 m.
It is an extrusion manufacturing apparatus of synthetic resin plate which is less than or equal to m and is connected to a drive unit 5 in which each guide roll 4 can adjust its peripheral speed.

According to the second aspect of the present invention, each guide roll 4 in the above apparatus is rotationally driven by synchronizing its peripheral speed with the peripheral speed of the cooling glazing roll 1.

[0015]

In the invention of claim 1, the distance between the axis of the guide roll 4 closest to the cooling glazing roll and the axis of the cooling glazing roll 1 and the distance between the adjacent guide rolls 4 is 500 mm or less. What is made small is to prevent the plate-shaped synthetic resin 6 from hanging down between them due to its own weight. At the same time, each guide roll 4 is connected to the drive unit 5 by rotating the guide rolls 4 to increase the number of the guide rolls 4 and thereby to reduce the passage resistance of the plate-like synthetic resin 6. It is to prevent the increase.

In the invention of claim 2, the guide roll 4
The peripheral speed of is synchronized with the peripheral speed of the cooling glazing roll 1 so that the plate-like synthetic resin 6 does not sag or the plate-like synthetic resin 6 is subjected to tension during the time it reaches the take-up roll 2. It is something to do.

[0017]

EXAMPLE As shown in FIG. 1, a die 7, a cooling glazing roller 1, a guide roll conveyor device 3 and a take-up roll 2 are sequentially connected in series.
A post-processing device such as the cutting device 8 is connected to the further downstream side of the. The plate-shaped synthetic resin 6 extruded from the die 7 is
Cooling and glazing are performed by the cooling glazing roll 1, and while being further cooled, it is taken by the take-up roll 2 through the guide roll conveyor device 3. Further, the plate-shaped synthetic resin 6 that has exited the take-up roll 2 is cut in the length direction by the cutting device 8 and further cut in the width direction on the downstream side to become a product.

The distance between the axis of the cooling glazing roll 1 and the axis of the guide roll 4 closest thereto and the distance between the axes of the adjacent guide rolls 4 must be 500 mm or less, preferably. It is 300 mm or less. If this interval exceeds 500 mm, it becomes difficult to prevent the plate-shaped synthetic resin plate 6 from hanging down due to its own weight. Further, the lower limit of each interval is the installable cooling glazing roll 1 and guide roll 4
It is determined based on the diameter and the like.

Each guide roll 4 of the guide roll conveyor device 3 is connected to a driving device 5 such as a motor, and is driven to rotate. The illustrated drive device 5 is provided for each guide roll 4, but all the guide rolls 4 may be commonly connected to one drive device 5.

The drive unit 5 is connected to the controller 9,
Further, the controller 9 is a driving device 10 for the cooling glazing roll 1.
Is also connected to. The controller 9 adjusts the peripheral speed of the guide roll 4, and the controller 9 in the present embodiment synchronizes with the peripheral speed of the cooling glazing roll 1 to rotate and drive the guide roll 4. The driving device 5 is driven. That is, the controller 9 in the present embodiment calculates the peripheral speed of the cooling glazing roll 1 from the number of rotations of the driving device 10 of the cooling glazing roll 1, and the guide roll 5
The driving device 5 of the guide roll 5 is controlled to the rotation speed calculated so that the peripheral speed of the guide roll becomes equal to this peripheral speed.

In this way, since each guide roll 4 always rotates at the peripheral speed synchronized with the peripheral speed of the cooling glazing roll 1, plate-shaped composite is carried out until the guide glazing roll 1 leaves the guide roll conveyor device 3. The resin 6 will be conveyed without any slack or tension.

Further, in general, the peripheral speed of the take-up roll 2 is adjusted according to the peripheral speed of the cooling glazing roll 1, so that the peripheral speed of the cooling glazing roll 1 is the same as that of the cooling glazing roll 1 when operating this apparatus. It should be adjusted to the peripheral speed.

However, the controller 9 is also connected to a drive device (not shown) for the take-up roll 2, and the peripheral speeds of the guide roll 4 and the take-up roll 2 are synchronized with the peripheral speed of the cooling glazing roll 1. It can be controlled at the same time.

Next, an operation example of this device will be described.

In the apparatus as shown in FIG. 1, the cooling glazing roll 1 has a diameter of 300 mm, the guide rolls 4 have a diameter of 10 mm, and the number of the cooling glazing roll 1 is 12 mm.
The distance between the axis of the guide roll 4 and the axis of the guide roll 4 closest to it is 40
0 mm, the distance between the axes of adjacent guide rolls 4 is 3
It was set to 00 mm.

Acrylic resin die 7
To a thickness of 3 mm, and the peripheral speed of the cooling glazing roll 1 and the peripheral speed of each guide roll 4 are synchronized so that the ratio is all 1
As a result, tension is hardly generated in the plate-shaped synthetic resin plate 6, and there is almost no frictional force between the plate-shaped synthetic resin plate 6 and the guide roll 4, so that the plate-shaped synthetic resin plate 6 can be stably conveyed to the take-up roll 2. I was able to.

[0027]

EFFECTS OF THE INVENTION The present invention is as described above, and in the state where no tension is generated in the plate-like synthetic resin 6, the plate-like synthetic resin 6 does not hang down due to its own weight, and the take-up roll 2 is stable. The resulting synthetic resin plate has no internal stress (strain),
It has excellent performance in that shrinkage does not occur in the heat molding process.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a hanging state of a plate-shaped resin due to its own weight.

[Explanation of symbols]

 1 Cooling Glazing Roll 2 Pulling Roll 3 Guide Roll Conveyor Device 4 Guide Roll 5 Guide Roll Driving Device 6 Plate Synthetic Resin 7 Die 8 Cutting Device 9 Controller 10 Cooling Glazing Roll Driving Device

Claims (2)

[Claims] 1. A guide roll conveyor device is provided between a cooling glazing roll and a take-up roll, and a distance between a guide roll shaft closest to the cooling glazing roll and a shaft of the cooling glazing roll is provided in the guide roll conveyor device. And the distance between the axes of the adjacent guide rolls is 500 mm or less,
Moreover, each of the guide rolls is connected to a driving device capable of adjusting the peripheral speed thereof, and an extrusion manufacturing apparatus for a synthetic resin plate, characterized in that: 2. The driving method of the apparatus according to claim 1, wherein each guide roll is rotationally driven by synchronizing its peripheral speed with the peripheral speed of the cooling glazing roll.