JPH0655630A - Device for fabricating tube bilm - Google Patents

Abstract

PURPOSE:To provide a device for fabricating a tubular film which can carry out proper stretch molding by means of resin heated uniformly. CONSTITUTION:An extruder 1 for melting and extruding given resin 2 is disposed, and a die 8 with a discharge opening 10 for extruding the molten resin 2 is connected with the extruder 1, and a cooling device 22 for cooling the resin 2 melted by the extruder 1 down to the given stretch molding temperature is discharged between the extruder 1 and the discharge opening 10 of the die 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular film manufacturing apparatus, and more particularly to a tubular film for forming a film having a predetermined shape by discharging a molten resin supplied by an extruder from a discharge port of a die. Manufacturing equipment.

[0002]

2. Description of the Related Art Generally, a resin such as a thermoplastic resin which is charged from an hopper by an extruder is melted while being transported by a screw conveyor in a closed cylinder, and then the molten resin is formed into a die having a predetermined shape. A tubular film manufacturing apparatus is widely used in which a desired tubular film is molded by extruding the molten resin into a tubular shape through the die discharge port.

FIG. 2 shows such a conventional tubular film manufacturing apparatus. On the upper surface of the extruder 1, a hopper for supplying a predetermined resin 2 into a cylinder 3 inside the extruder 1. 4, a screw conveyor 6 that conveys the resin 2 supplied from the hopper 4 toward a head 5 having an extrusion port, and a head from the screw conveyor 6 are installed inside the extruder 1. A heater (not shown) for melting the resin 2 conveyed to 5 is incorporated. A feed pipe 7 is connected to the upper surface of the head 5 of the extruder 1, and an inlet portion 9 of a tubular film forming die 8 is detachably attached to the tip of the feed pipe 7. It is connected. An annular ejection port 10 for ejecting the molten resin 2 in a thin film cylindrical shape is formed on the upper portion of the die 8. The ejection port 1 of the die 8 is formed.
An air ejection port 11 that opens inside 0 is formed.
Further, an air supply port 12 communicating with the air ejection port 11 is provided on the lower surface of the die 8, and air is sent from the air supply port 12 to eject air from the air ejection port 11. The resin 2 discharged from the discharge port 10 is blown up.

A cooling air supply device 13 for cooling the resin 2 discharged in a cylindrical shape from the discharge port 10 is disposed near the upper portion of the die 8 and further above the die 8. Is the resin 2 discharged in a cylindrical shape from the discharge port 10.
A pair of guide plates 14 and 1 for guiding the vehicle so as to be folded flat.
4 are provided. A pair of pinch rollers 15 and 15 for pulling up and transporting the planar resin 2 folded by the guide plate 14 are disposed above the respective guide plates 14, and above the pinch rollers 15. A guide roller 16 is provided. A pair of second pinch rollers 17 and 17 is provided on the downstream side of the guide roller 16.
Below the second pinch roller 17, a pair of third pinch rollers 18, 18 are arranged so as to have a predetermined interval. This second pinch roller 17
A plate-shaped heater 19 for heating the resin 2 to a predetermined stretching temperature is disposed between the third pinch roller 18 and the third pinch roller 18, and a guide roller is provided downstream of the third pinch roller 18. A winding roller 21 that winds the resin 2 through 20 is provided.

In the conventional tubular film manufacturing apparatus, the predetermined resin 2 charged from the hopper 4 of the extruder 1 is melted by the heater while being conveyed by the screw conveyor 6, and the extrusion port of the head 5 is discharged. From the die, and then sent to the inlet of the die 8 via the feed pipe 7. Then, by the die 8, the molten resin 2
Is formed into a cylindrical shape and is discharged upward from the discharge port 10, and air is fed from the air supply port 12 into the die 8 to blow air from the molten resin 2 from the air jet port 11 at a predetermined pressure. The resin 2 is blown into the cylindrical film to blow out the resin 2. The discharged resin 2 is used as the cooling air supply device 1
The guide plate 1 is cooled by cooling air blown from the guide plate 1.
4 is gradually folded into a flat shape by 4 while being pulled up by the pinch roller 15 and then moved through the guide roller 16 to the second position.
It is sent to the pinch roller 17.

Then, the resin 2 conveyed by the second pinch roller 17 is reheated by the heater 19, and the resin 2 heated by the heater 19 is blown again by an air ejection device (not shown). Stretched,
It is wound around the winding roller 21 via the third pinch roller 18 and the guide roller 20. In this case, the pinch rollers 15, 17, 18 are
Since the rotation speed of the third pinch roller 18 is increased with respect to the second pinch roller 17, between the second pinch roller 17 and the third pinch roller 18,
The reheated resin 2 can be appropriately stretched in two directions, the circumferential direction and the length direction.

[0007]

However, in the conventional tubular film manufacturing apparatus described above, the temperature of the resin 2 discharged from the discharge port 10 of the die 8 is relatively high, and the resin 2 is appropriately bidirectionally stretch-molded. Therefore, the second pinch roller 17 and the third pinch roller 18 cannot be performed.
In the meantime, the heating heater 19 reheats to perform bidirectional stretch molding. However, it is extremely difficult to uniformly heat the resin 2 by the heating heater 19, so that temperature unevenness may occur. There is a problem in that uneven stretching of the resin 2 occurs and proper stretch molding cannot be performed.

Further, in order to stretch the resin 2, it is necessary to provide a special mechanism such as the second and third pinch rollers 17 and 18, a heater 19 and an air jetting device, which makes the structure of the entire device complicated. In addition, there is a problem that the size of the device is increased.

The present invention has been made in view of the above points, and an object of the present invention is to provide a tubular film manufacturing apparatus capable of performing appropriate stretch molding with a uniformly heated resin. .

[0010]

In order to achieve the above object, the tubular film manufacturing apparatus according to the present invention is provided with an extruder for melting and extruding a predetermined resin, and the molten resin is predetermined in the extruder. In a tubular film manufacturing apparatus in which a die having a discharge port for forming and discharging into a shape is connected, between the extruder and the discharge port of the die, a resin melted by the extruder is stretched in a predetermined manner. It is characterized in that a cooling device for cooling to a molding temperature is provided.

[0011]

According to the tubular film manufacturing apparatus of the present invention, the resin melted by the extruder is cooled to a predetermined stretch molding temperature by the cooling device and supplied to the discharge port of the die. Can be stretch-molded in a state where the temperature is uniform, and as a result, the resin discharged from the discharge port of the die causes the 2
It is possible to appropriately perform stretch molding in the direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.
The same parts as those in FIG.

FIG. 1 shows an embodiment of an apparatus for producing a tubular film according to the present invention. On the upper surface of an extruder 1, a predetermined resin 2 is supplied into a cylinder 3 inside the extruder 1. A hopper 4 is attached to the inside of the extruder 1, and a screw conveyor 6 that conveys the resin 2 supplied from the hopper 4 toward a head 5 having an extrusion port, and a screw conveyor thereof. A heater (not shown) for melting the resin 2 conveyed from 6 to the head 5 is built in. Further, in the present embodiment, a cooling device 22 is provided around the outer periphery of the cylinder 3 at the tip portion of the extruder 1, and the cooling device 22 is provided with cooling water inside the cooling device 22. Cooling water piping 23 to supply
Are connected. Thereby, the extruder 1 is configured to convey the resin 2 from the hopper 4, the compression region in which the heater 2 heats and compresses the resin 2 to about 150 ° C., and the resin 2 heated in the compression region, It is constituted by a supply region which is cooled to a predetermined stretching temperature of about 100 ° C. and is supplied to the head 5.

Further, the head 5 of the extruder 1 is detachably connected to an inlet 9 of a tubular film forming die 8 having an annular discharge port 10 formed in the upper part thereof via a feed pipe 7. Inside the ejection port 10 of the die 8, the resin 2 ejected from the ejection port 10 by ejecting the air supplied from the air supply port 12 provided on the lower surface of the die 8 is ejected. An air ejection port 11 for blowing and expanding is formed.

A cooling air supply device 13 for cooling the resin 2 discharged in a cylindrical shape from the discharge port 10 is arranged near the upper portion of the die 8 and further above the die 8. Is the resin 2 discharged in a cylindrical shape from the discharge port 10.
Is provided with a pair of guide plates 14 for guiding so as to be folded in a plane. A pinch roller 15 that pulls up and conveys the planar resin 2 folded by the guide plate 14 is arranged at an upper position of each of the guide plates 14, and a guide roller is provided on the downstream side of the pinch roller 15. A winding roller 21 that winds the resin 2 through 16 is provided.

Next, the operation of this embodiment will be described.

In this embodiment, the predetermined resin 2 charged from the hopper 4 of the extruder 1 is conveyed by the screw conveyor 6 in the conveying area of the extruder 1,
After being heated and melted to about 150 ° C. by the heater in the compression region, about 100 ° C. by the cooling device 22 in the supply region.
It is cooled to and is extruded to the head 5. Then, the resin 2 is sent from the head 5 to the inlet of the die 8 via the feed pipe 7, and the molten resin 2 is molded into a tubular shape by the die 8 and discharged upward from the discharge port 10. At the same time, the air is fed from the air supply port 12 into the die 8 so that the air is blown from the air ejection port 11 at a predetermined pressure.
The resin 2 is blown up by being ejected into a cylindrical film made of. At this time, in this embodiment, the temperature of the resin 2 discharged from the discharge port 10 of the die 8 is cooled by the cooling device 22 in the supply region of the extruder 1 to a temperature at which proper stretch molding can be performed. Since it is set to resin 2
It is possible to appropriately perform stretch molding in the two directions of the circumferential direction and the length direction.

The resin 2 discharged from the discharge port 10 of the die 8 is cooled by the cooling air blown from the cooling air supply device 13 and gradually folded into a planar shape by the guide plate 14, It is pulled up by the pinch roller 15 and wound up by the winding roller 21.

Therefore, in this embodiment, the die 8
Since the resin 2 discharged from the discharge port 10 is supplied at the optimum temperature for performing the stretching process, and unlike the conventional case, the resin 2 is not stretch-molded by heating with a heater. Stretch molding can be performed in a state where the temperature is uniform, and as a result, the resin 2 discharged from the discharge port 10 of the die 8 can appropriately perform stretch molding of the resin 2 in two directions.

Further, since the resin 2 discharged from the discharge port 10 of the die 8 is used for molding, it is not necessary to provide a heater or a large number of pinch rollers as in the conventional case, and the apparatus can be simplified. And can be manufactured easily and at low cost.

In the above embodiment, the case where the cooling device 22 is provided in the extruder 1 has been described, but the cooling device 22 may be provided in the head 5 or the die 8 portion, for example.

Further, in the above embodiment, the melting of the resin and the extrusion of the resin cooled to a predetermined temperature are carried out by one extruder 1. However, an extruder dedicated to melting for melting the resin, The extruder 1 may be configured by an extruder dedicated to extrusion for forcibly extruding the resin, which has been cooled to a predetermined temperature, to the die 8.

Further, the present invention is not limited to the above-mentioned embodiment, but various modifications can be made if necessary.

[0024]

As described above, in the tubular film manufacturing apparatus according to the present invention, the resin melted by the extruder is cooled to a predetermined stretch molding temperature by the cooling device and supplied to the discharge port of the die. Therefore, stretch molding can be performed in a state where the temperature of the resin is uniform, and as a result, stretch molding in two directions, the circumferential direction and the length direction of the resin, is performed by the resin discharged from the discharge port of the die. It can be done appropriately. Further, since molding is performed by the resin discharged from the discharge port of the die, it is not necessary to provide a heater or a large number of pinch rollers as in the conventional case, and the device can be simplified and easily, In addition, there is an effect that it can be manufactured at low cost.

[Brief description of drawings]

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

FIG. 2 is a schematic configuration diagram showing a conventional tubular film manufacturing apparatus.

[Explanation of symbols]

 1 Extruder 2 Resin 3 Cylinder 4 Hopper 5 Head 6 Screw Conveyor 7 Feed Pipe 8 Die 10 Discharge Port 11 Air Jet 12 Air Supply 13 Cooling Air Supply 14 Guide Plate 15 Pinch Roller 21 Winding Roller 22 Cooling Device 23 Cooling water piping

Claims (1)

[Claims] 1. A tubular film produced by arranging an extruder for melting and extruding a predetermined resin, and connecting a die having a discharge port for molding and discharging the molten resin into a predetermined shape to the extruder. In the apparatus, a cooling device for cooling the resin melted by the extruder to a predetermined stretch molding temperature is provided between the extruder and the discharge port of the die, and a tubular film manufacturing apparatus. .