JPH115242A - Manufacture of synthetic resin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate removal of solid material due to cooling of vapor without external appearance fault of a formed synthetic resinous sheet, by supplying the air from a die side of one side in the case of discharging the sheet from a die body, and getting the vapor out of a die side of the opposite side. SOLUTION: In the case of manufacturing the synthetic resin sheet, the air generated by a blower 3 is brought into contact with vapor generated synthetic resin is discharged from a die 1 to a lower side, and sent to be sucked to a suction duct unit 4 disposed at a die 1 side separate from above a molding pass line of the sheet at an opposite side to the blower 3. The blower 3 uses a fan or an intermediate temperature hot air generator sold in the market in the case of the sheet made of the resin molded at a low temperature, may be similar to that in the case of a low temperature if the sheet is formed of the synthetic resin molded at a high temperature, or is used for a high temperature hot air generator in the case of remarkably causing an inconvenience of molding the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a synthetic resin sheet, and more particularly, to a synthetic resin sheet capable of efficiently removing vapor generated from a die body during the production of a synthetic resin sheet. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in order to remove vapor generated during the production of a synthetic resin sheet, vapor suction, which is an umbrella-shaped object provided with a suction duct, is provided above a die body for discharging the synthetic resin sheet. 2. Description of the Related Art A method in which an apparatus is attached to thereby remove a vapor by suction is widely used.

[0003]

However, in the conventional method, the vapor adheres to the die body and the vapor suction device, and the droplets and solidified products formed by cooling the adhered vapor are formed into a synthetic resin sheet. As a result of the dispersion on the pass line, poor appearance occurred in the resulting synthetic resin sheet. In addition, an operation for removing solidified substances generated by cooling the vapor was required.

Accordingly, the present invention provides a method of forming a synthetic resin sheet without causing a defective appearance in the completed synthetic resin sheet, reducing the frequency of removing solidified products formed by cooling the vapor. An object of the present invention is to provide a method of manufacturing a synthetic resin sheet that can efficiently remove vapor without suctioning ducts on a line.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that instead of sucking the vapor with a vapor suction device provided on the upper part of the die body, the blower blows the vapor into the vapor. We found that we hit the wind, and completed the present invention. That is, in the present invention, during the production of a synthetic resin sheet, when discharging the synthetic resin sheet from the die body, air is blown from one die side portion by a commercially available fan or a low-speed blower, and the opposite die side is discharged. A method for producing a synthetic resin sheet, characterized in that a vapor is sucked by a suction blower at one side.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings illustrating one embodiment. Here, FIG.
Is a front view of the present invention, FIG. 2 is a side view of the present invention, FIG. 3 is a plan view of the present invention, 1 is a T die, 2 is a forming roll, 3 is a blower, 4 is a suction duct device, 5 is a blowing area, and θ is a blowing angle.

[0007] The present invention relates to a method for manufacturing a synthetic resin sheet.
The air generated by the blower 3 is applied to the vapor generated when the synthetic resin is discharged below the die, and the vapor is sent to the suction duct device 4 to be sucked. As for the blower 3, in the case of a synthetic resin sheet made of a synthetic resin molded at a low temperature, it is desirable to use a commercially available fan, a medium-temperature hot air generator, or the like. Further, in the case of a synthetic resin sheet made of a synthetic resin molded at a high temperature, it may be the same as the case of the low temperature, but if there is a significant inconvenience in molding the synthetic resin, use a high-temperature hot air generator or the like. Is desirable.

Although the intensity of the air blown from the blower 3 varies depending on the width of the synthetic resin discharge portion of the die body and the discharge speed of the synthetic resin, the wind speed is preferably 2.0 to 4.0 m / sec. As shown in FIG. 3, the air from the blower 3 is blown from one side of the die, and the blowing angle θ is desirably about 30 to 45 degrees with respect to the horizontal. If the blowing angle θ is less than 30 degrees, the vapor is pushed upward, the vapor adheres to the die body and the vapor suction device, and the droplets and solidified products formed by cooling the adhered vapor are formed of a synthetic resin sheet. Adheres to On the other hand, when the angle exceeds 45 degrees, wind is applied to the forming rolls, causing problems such as cooling of the forming rolls.

The temperature of the blown air from the blower 3 should be set in such a range that the temperature of the synthetic resin sheet does not decrease while paying sufficient attention to the temperature of the synthetic resin sheet discharged from the die body and the temperature of the die body. desirable. It is desirable to determine the range of the blowing region 5 from the range of vapor rise generated from the die discharge unit.
The range up to about 0 cm is good.

Suction duct device 4 for sucking vapor
Is located on the side of the die opposite to the side where the blower 3 is located, and away from above the synthetic resin sheet forming pass line, and uses a commercially available or self-made suction duct device. The diameter of the suction port is appropriately selected according to the degree of air diffusion and the air blowing area 5. In particular, 1.5 to 2.0 of the blowing area 5
It is desirable that the suction duct device has a suction port having a double diameter.

Next, the present invention will be described in more detail with reference to examples. Note that the present invention is not limited to the following embodiments.

[0012]

【Example】

(Example 1) Using a commercially available polycarbonate resin as a raw material,
In the same process as in FIG. 1, a synthetic resin sheet was manufactured according to the present invention. As the blower, a commercially available medium-sized hot air generator (manufactured by Takezuna Seisakusho) was used. In addition, a home-made suction duct device was used as a vapor suction device. The individual conditions at the time of implementation are as follows. Wind speed 3.2 to 8.0 m / sec Blast temperature 25 to 30 ° C. Blow angle 40 ° Blow area A 25 cm from the die body, a suction port diameter of 40 cm or more. Approximately 30% defective appearance
However, in the present invention, it could be reduced to 5%, and the appearance defect was significantly reduced. In addition, the frequency of the operation for removing the solidified vapor could be reduced from three times / day to once / week.

[0013]

As described above, according to the present invention, the air generated at the time of manufacturing a synthetic resin sheet is produced by applying the wind generated by the blower to the vapor and sucking the vapor by the suction duct device. It can be removed efficiently. As a result, the appearance defect of the synthetic resin sheet is prevented from being generated, and the frequency of the operation of removing the solidified material formed by cooling the vapor is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of the present invention.

FIG. 2 is an explanatory side view of the present invention.

FIG. 3 is an explanatory plan view of the present invention.

[Explanation of symbols]

 Reference Signs List 1 T die 2 Forming roll 3 Blower 4 Suction duct device 5 Blowing area θ Blowing angle

Claims (1)

[Claims] 1. During the production of a synthetic resin sheet, when discharging the synthetic resin sheet from the die body, air is blown from one side of the die and vapor is sucked at the opposite side of the die. A method for producing a synthetic resin sheet, characterized in that: