JPH0788929A - Casting apparatus - Google Patents

Abstract

PURPOSE:To prevent the jet streams for cooling a rotary cooling roll from becoming a mist form to scatter to the outside from the peripheral edge of a jet stream sprinkling tank. CONSTITUTION:Brushes 7 made of a thermoplastic resin are provided to the peripheral edge of the jet stream sprinkling tank 6 opposed to a rotary cooling roll 3 so as to be allowed to protrude toward the cooling roll 3 and suction ports are provided to the root parts of the brushes 7. By this constitution, jet streams are prevented from becoming a mist form to scatter to the outside from the peripheral edge of the jet stream sprinkling tank 6 and, even if the brushes are bent, they are easily restored to the original shape and the jet streams are sucked from the suction ports to make the scattering preventing effect of the jet streams to the outside certain still more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a jet flow from the periphery of a jet dispersion tank facing a rotating cooling roll around which a molten resin film or sheet extruded from a die lip of an extruder is scattered. The present invention relates to a casting device.

[0002]

2. Description of the Related Art Conventionally, a jet stream from a spray nozzle sprinkled on a molten resin film or sheet on a rotating cooling roll is prevented from scattering to the outside, and the jet stream once sprayed is recovered and used for cooling again. Although the jet spray tank is provided for this purpose, a certain gap is provided between the jet spray tank and the rotary cooling roll so as not to hinder the movement of the sheet passing carrier chain. The jet itself is sprayed in the form of a mist so that the molten resin film or sheet on the rotary cooling roll is evenly dispersed and cooled uniformly. As a result, there is a drawback that the atomized jet is scattered to the outside from the gap at the periphery of the jet dispersion tank, which adversely affects other devices.

[0003]

As a preventive measure for this, it has been considered to cover the gap around the periphery of the jet dispersion tank with a sheet, but in this case, when a sheet is passed, a carrier chain or a sheet is passed. Due to the resin mass, the sheet covering the gap is greatly bent, and while this work is repeated several times, the sheet does not deform and return to the original shape,
There was a defect that the jet flow scattered to the outside. For this reason, conventionally, it has been considered that the jet flow can be prevented from scattering to the outside in a stable state even after long-term use.
The device shown in Japanese Patent No. 38415 has been proposed.

That is, in the above-mentioned conventional apparatus, a water spray having a jet density higher than that of the cooling jet is provided in the uppermost portion of the jet spray tank, and spray water is jetted toward the roll to form a water curtain. In reality, the water in the water flow curtain may leak to the outside when the sheet is passed, and the expected effect was not obtained. Therefore, the present invention is intended to provide a casting device capable of preventing the jet flow from scattering to the outside in a stable state even after long-term use.

[0005]

Therefore, according to the present invention, a brush protruding toward the rotary cooling roll is attached to the peripheral edge of the jet dispersion tank facing the rotary cooling roll.
This is a means for solving the problem. According to the present invention, the bristles forming the brush are made of thermoplastic resin, and the bristles have a maximum length of 170 mm and a diameter of 0.3 to 0.6 mm. This is formed by forming an intake port for sucking the inner jet flow, and is used as a means for solving the problem.

[0006]

In the casting apparatus of the present invention, a brush (made of a thermoplastic resin and having a maximum length of 17) is provided on the periphery of the jet dispersion tank so as to cover the gap between the jet dispersion tank and the rotating cooling roll.
(0 mm, bristles having a diameter of 0.3 to 0.6 mm) are attached so that the jet flow in the jet spray tank is not blocked by the layers of bristles of the brush and scattered to the outside. In addition, since the brush has high resilience, the bristles of the brush that cover the gap are temporarily bent greatly by the carrier chain and the resin when passing the sheet, and even if this work is repeated several times, The original shape is immediately restored, and the effect of preventing the jet from scattering outside is not reduced. Further, since the intake port for sucking the jet flow inside the peripheral edge of the jet flow distribution tank is formed at the root portion of the brush, the effect of preventing the jet flow from scattering outside can be further ensured.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 4 show the embodiments of the present invention. In order to improve the cooling capacity of the rotary cooling roll 3, the same cooling is performed on the lower outer circumference of the rotary cooling roll 3 for winding and solidifying the molten resin film or sheet 2 extruded from the die lip 1 in the extruder not shown in FIG. A spray nozzle 4 for spraying a jet of water or the like on the molten resin film or sheet 2 wound around a roll 3 is arranged together with a water supply pipe 5. Around the outer periphery of the spray nozzle 4, that is, around the lower portion of the rotary cooling roll 3, a carrier chain for sheet passing (not shown) used when the molten resin film or the sheet 2 is wound is not disturbed. A jet dispersion tank 6 for collecting the jet from the spray nozzle 4 is attached with a gap interposed. On the other hand, a brush 7 is attached to the periphery of the jet spray tank 6 for preventing the jet flow from passing outside through the gap between the jet spray tank 6 and the rotary cooling roll 3. This brush 7 is made of a thermoplastic resin such as polypropylene in consideration of the resilience, and is formed of bristles 8 having a length of 50 mm to 170 mm and a diameter of 0.3 to 0.6 mm, as shown in FIGS. 2 and 3. It has a unique structure.

The operation of the embodiment configured as described above will now be described. In the case of the spray water droplet scattering prevention device 9 in the casting apparatus, the jet spray tank 6 and the rotary cooling roll are provided at the periphery of the jet spray tank 6. A brush 7 is attached so as to cover the gap between the brush 7 and the bristles 8. The bristles 8 are formed in consideration of the resilience. It will not be scattered outside.

Further, since the brush 7 is formed of the thermoplastic resin bristles 8 considering resilience, the brush 7 has a high resilience, and the gap is covered by the carrier chain at the time of sheet passing and the resin solidified at the time of sheet passing. Even if the bristles 8 of the brush 7 are temporarily bent greatly, the bristles 8 of the brush 7 are immediately restored, and even if this work is repeated several times, the bristles 8 are not deformed, and the effect of preventing the jet flow from scattering outside is achieved. It never drops. Furthermore, FIG.
As shown in FIG. 3, an intake port 10 is formed in the root portion of the brush 7 to suck the jet flow inside the peripheral edge of the jet flow distribution tank 6,
The effect of preventing the jet flow from being scattered outside is further ensured.

[0010]

As described in detail above, according to the present invention, there is no drawback that the atomized jet flow is scattered to the outside from the gap at the periphery of the jet dispersion tank, and it does not adversely affect other devices. . Therefore, the cooling effect of the molten resin film or sheet by the rotating cooling roll can be further promoted, the brush is temporarily bent largely due to the resin mass, and even if this operation is repeated, the brush is made of the thermoplastic resin. Therefore, it can be easily restored to its original shape, and since the suction port is formed in the root part of the brush, the jet flow can be sucked and the effect of preventing the jet flow from scattering to the outside can be further secured. it can.

[Brief description of drawings]

FIG. 1 is a side sectional view of a casting device showing an embodiment of the present invention.

FIG. 2 is a front view of a brush used in the device of FIG.

FIG. 3 is a side view of the brush of FIG.

FIG. 4 is a side sectional view showing another embodiment in which the intake port is attached.

[Explanation of symbols]

 1 Die Lip 2 Molten Resin Film or Sheet 3 Rotating Cooling Roll 4 Spray Nozzle 5 Water Supply Pipe 6 Jet Spraying Tank 7 Brush 8 Bristles 9 Scattering Prevention Device 10 Intake Port

Claims (3)

[Claims] 1. A casting device, wherein a brush protruding toward the rotary cooling roll is attached to the periphery of the jet dispersion tank facing the rotary cooling roll. 2. The bristles forming the brush are made of a thermoplastic resin, and the bristles have a maximum length of 170 mm and a diameter of 0.3 to 0.
The casting device according to claim 1, wherein the casting device is 6 mm. 3. The casting device according to claim 1, wherein an intake port for sucking the jet flow inside the peripheral edge of the jet flow distribution tank is formed at the root portion of the brush.