JPH06304994A - Manufacturing device for resin film - Google Patents

Abstract

PURPOSE:To provide a manufacturing device for a resin film which can enhance remarkably transparency even for resin with heavy film thickness. CONSTITUTION:A T-die 2 with a discharge port 3 for mold discharging given molten resin 1 in the plane shape is disposed, and a cooling roll 4 for cooling and solidifying the molten resin 1 discharged out of the discharge port 3 is disposed rotatably in the vicinity of the discharge port 3 of the T-die 2, while a water jet device 11 for jetting cooling water 10 from a water jet nozzle 12 to the resin 1 is disposed on the outer peripheral side of the cooling roll 4, and a water recovering device 13 for recovering the cooling water 10 after jetting is disposed in the vicinity of the water jet device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin film manufacturing apparatus, and more particularly to a resin film manufacturing apparatus for forming a planar resin film by discharging molten resin from a discharge port of a T die.

[0002]

2. Description of the Related Art Generally, a resin such as a thermoplastic resin is melted, the molten resin is supplied to a T die having a predetermined shape, and the molten resin is discharged in a flat shape from a discharge port of the T die to obtain a desired shape. The resin film manufacturing apparatus for molding the resin film is used in many cases.

FIG. 3 shows such a conventional resin film manufacturing apparatus, in which a T-die 2 for molding a resin film, to which a predetermined molten resin 1 is supplied, is provided. A substantially linear discharge port 3 for discharging the molten resin 1 in a planar shape of a thin film is formed therein. A cooling roll 4 that cools and solidifies the resin 1 discharged from the discharge port 3 of the T die 2 is rotatably arranged below the T die 2. The cooling roll 4 is, for example, It is cooled to a predetermined temperature by a cooling pipe (not shown) conducted inside.

On the outer peripheral side of the cooling roll 4, a water storage tank 6 having an open upper surface and storing a predetermined cooling water 5 is disposed. Inside the water storage tank 6, the resin 1 is stored. A cooling auxiliary roll 7 which is in close contact with the cooling roll 4 and supplies the cooling water 5 of the water storage tank 6 to the resin 1 portion.
Are rotatably driven. Further, a transport roll 8 that transports the resin 1 solidified by the cooling roll 4 is disposed on the outer peripheral side of the cooling roll 4.

In the conventional resin film manufacturing apparatus described above, a predetermined molten resin 1 is sent to a T die 2, and the T die 2 molds the molten resin 1 into a flat surface and downwards from the discharge port 3. The discharged resin 1 is brought into close contact with the surface of the cooling roll 4 while the cooling water 5 in the water storage tank 6 is supplied by the cooling auxiliary roll 7, whereby the resin 1 is It is cooled and solidified by the cooling water 5 and the cooling roll 4. And this resin 1 is
It is transported by the transport roll 8 and sent to a predetermined supply position (not shown).

FIG. 4 shows another conventional resin film manufacturing apparatus, in which a predetermined molten resin 1 is discharged from a discharge port 3 of the T die 2 below the T die 2. A cooling roll 4 that cools and solidifies the resin 1 is disposed so as to be rotatable, and an air nozzle 9 that ejects cooling air to the resin 1 is disposed on the outer peripheral side of the cooling roll 4. Other parts are the same as those shown in FIG.

In such a conventional resin film manufacturing apparatus, the molten resin 1 discharged from the discharge port 3 of the T die 2 is cooled by the cooling air jetted from the air nozzle 9, and this cooling air is also cooled. By this, it is brought into close contact with the cooling roll 4 and is cooled and solidified by the cooling roll 4.

[0008]

However, in recent years, a resin film having high transparency has been demanded. In the conventional resin film manufacturing apparatus, the resin 1 is cooled by the cooling auxiliary roll 7 or the air nozzle 9. Since the resin 1 is cooled by bringing it into close contact with the roll 4, for example, when molding the resin 1 having an extremely thin film thickness, the resin 1 having high transparency can be molded, but the resin 1 has a thickness of 100 μm. Resin 1 with a relatively thick film thickness of about 2 mm
However, since the resin 1 is not rapidly cooled, the resin 1 is solidified in a semitransparent state, and the resin 1 having high transparency cannot be molded. .

In order to prevent this, it is necessary to cool the resin 1 in the vicinity of the discharge port 3 of the T die 2. However, in the cooling means by the cooling auxiliary roll 7, the water tank 6 is provided. In addition, since the water storage tank 6 hits the cooling roll 4, there is a problem that the cooling auxiliary roll 7 cannot be arranged in the vicinity of the discharge port 3 of the T die 2. Further, the cooling means using the air nozzle 9 has a problem that the cooling range by the cooling air is narrow and the cooling air jetted onto the resin 1 escapes from both ends of the cooling roll, so that the cooling effect is low. There is.

The present invention has been made in view of these points, and an object of the present invention is to provide a resin film manufacturing apparatus capable of remarkably increasing transparency even with a resin having a large film thickness. Is.

[0011]

In order to achieve the above object, a resin film manufacturing apparatus according to the present invention is provided with a T die having a discharge port for molding and discharging a predetermined molten resin in a flat shape. In a resin film manufacturing apparatus in which a cooling roll for cooling and solidifying a molten resin discharged from the discharge port is rotatably driven in the vicinity of the discharge port of the T die, a jet nozzle is provided on the outer peripheral side of the cooling roll. A refrigerant ejecting device for ejecting a refrigerant to the resin is disposed, and a refrigerant recovery device for recovering the ejected refrigerant is disposed in the vicinity of the refrigerant ejecting device.

[0012]

According to the apparatus for producing a resin film of the present invention, T
While molding the molten resin in a flat shape by a die and discharging from the discharge port to the outer peripheral surface of the cooling roll, the refrigerant injection device is operated to eject the refrigerant from the injection nozzle to the resin,
With this refrigerant, the resin is cooled, and the resin is brought into close contact with a cooling roll by the injection pressure of the refrigerant to cool the resin by the cooling roll. It can be arranged near the discharge port of the die, and since the resin is cooled and solidified simultaneously by the refrigerant and the cooling roll, it becomes possible to rapidly cool the resin. It can be solidified in an amorphous state.

[0013]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an embodiment of an apparatus for producing a resin film according to the present invention, in which a T die 2 for molding a resin film to which a predetermined molten resin 1 is supplied is arranged. The T-die 2 is formed with a substantially linear discharge port 3 for discharging the molten resin 1 in a thin film plane.
A cooling roll 4 that cools and solidifies the resin 1 discharged from the discharge port 3 of the T die 2 is rotatably arranged below the T die 2. The cooling roll 4 is, for example, It is cooled to a predetermined temperature by a cooling pipe (not shown) conducted inside.

Further, in the present embodiment, on the outer peripheral side of the cooling roll 4, water as a refrigerant injection device for ejecting cooling water 10 as a refrigerant to the resin 1 wound around the cooling roll 4 is provided. The water jetting device 11 is provided, and a water jetting nozzle 12 for jetting the cooling water 10 is formed at the tip of the water jetting device 11. Further, as shown in FIG. 2, leakage preventing pieces 17 extending so as to cover outer peripheral portions of both end surfaces of the cooling roll 4 are arranged at both ends of the water injection device 11, and the leakage is caused. The prevention piece 17 prevents the cooling water 10 jetted from the water jet nozzle 12 from leaking from both ends of the water jet device 11. The leakage prevention piece 17 may be arranged close to the peripheral surface of the cooling roll 4, or the water injection nozzle 1 may be provided.
It may be provided also in the upper and lower positions of 2, and when the leak prevention piece 17 is made of a soft material such as felt, it may be brought into contact with the cooling roll 4. Then, from this water injection nozzle 12 to the cooling water 10
The resin 1 is cooled by the cooling water 10 and is made to come into close contact with the cooling roll 4 by hydraulic pressure by jetting. As the coolant, cooling air or other cooling medium can be applied in addition to the cooling water 10. Further, by forming the water jet nozzle 12 to have a large width in the vertical direction, a cooling roll can be obtained. The adhesiveness of the resin 1 to the resin 4 can be further enhanced, and a long cooling time can be secured.

A water recovery device 13 for recovering the cooling water 10 ejected from the water injection nozzle 12 is integrally provided below the water injection device 11, and this water recovery device 13 is provided. A suction nozzle 14 for sucking the cooling water 10 is disposed below the water injection nozzle 12. Further, a vacuum device 15 is connected to the water recovery device 13, and by operating the vacuum device 15, the inside of the water recovery device 13 is evacuated to suck the cooling water 10 from the suction nozzle 14. It is done like this. Further, a suction nozzle 14 is provided below the water recovery device 13.
A drain pipe 16 for discharging the cooling water 10 sucked from the cooling roll 10 is disposed, and a transport roll 8 is rotatably driven on the outer periphery of the cooling roll 4.

Next, the operation of this embodiment will be described.

In this embodiment, a predetermined molten resin 1 is sent to a T-die 2, the T-die 2 molds the molten resin 1 into a flat surface, and it is discharged downward from the discharge port 3. The discharged resin 1 is wound around the outer peripheral surface of the cooling roll 4. Then, the water injection device 11 is operated to eject the cooling water 10 from the water injection nozzle 12 to the resin 1, the resin 1 is cooled by the cooling water 10, and the water pressure of the cooling water 10 is applied. The resin 1 is brought into close contact with the cooling roll 4, and the cooling roll 4 cools the resin 1. At this time, the cooling water 10 is the leakage prevention piece 1
7 prevents the water injection device 11 from leaking from both ends.

In this case, in this embodiment, the resin 1 is cooled and solidified simultaneously by the cooling water 10 and the cooling roll 4, so that the resin 1 can be rapidly cooled. The resin 1 can be solidified in an amorphous state. Further, the injection amount of the cooling water 10 by the water injection device 11 is controlled to an appropriate amount according to the material of the resin 1, the film thickness, and the like.

Then, the vacuum device 15 is operated to bring the inside of the water recovery device 13 into a vacuum state, so that the cooling water 10 jetted from the water jet nozzle 12 is sucked into the suction nozzle 1.
4 and the cooling water 10 from this suction nozzle 14
Is discharged from the drain pipe 16 to a predetermined location.

On the other hand, the resin 1 is carried by the carrying roll 8 and sent to a predetermined supply position (not shown).

Therefore, in this embodiment, since the resin 1 is simultaneously cooled and solidified by the cooling water 10 and the cooling roll 4, even if the resin 1 has a thick film thickness, it rapidly increases. It becomes possible to cool, and this resin 1 is solidified in an amorphous state, so that the resin 1
The transparency of can be significantly increased.

The present invention is not limited to the above embodiment, but various modifications can be made as necessary.

[0024]

As described above, in the resin film manufacturing apparatus according to the present invention, since the resin is cooled and solidified simultaneously by the refrigerant ejected from the refrigerant ejecting device and the cooling roll, it has a thick film thickness. Even a resin can be cooled rapidly, and as a result, it is possible to mold a resin having extremely high transparency.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a resin film manufacturing apparatus according to the present invention.

FIG. 2 is a partial configuration diagram showing an end portion of a cooling roll and a water injection device portion of FIG.

FIG. 3 is a schematic configuration diagram showing a conventional resin film manufacturing apparatus.

FIG. 4 is a schematic configuration diagram showing another conventional resin film manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin 2 T die 3 Discharge port 4 Cooling roll 8 Conveying roll 10 Cooling water 11 Water injection device 12 Water injection nozzle 13 Water recovery device 14 Suction nozzle 15 Vacuum device 16 Drain pipe 17 Leakage prevention piece

Claims (1)

[Claims] 1. A T-die having a discharge port for molding and discharging a predetermined molten resin in a plane is provided, and the molten resin discharged from this discharge port is cooled and solidified in the vicinity of the discharge port of the T-die. In a resin film manufacturing apparatus in which a cooling roll is rotatably driven, a cooling medium ejecting device for ejecting a cooling medium from the ejection nozzle to the resin is disposed on the outer peripheral side of the cooling roll. An apparatus for producing a resin film, characterized in that a refrigerant recovery device for recovering the ejected refrigerant is disposed in the vicinity of the device.