JP3358874B2 - Roll surface cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll surface cleaning apparatus for removing organic matter such as film dust adhering to the surface of a roll used in the production or processing of a thermoplastic resin film.

[0002]

2. Description of the Related Art A method of irradiating a surface of a metal part, glass, porcelain or the like with ultraviolet rays to wash organic deposits anhydrously has conventionally been used as a means for cleaning precision parts such as semiconductor products. The characteristic of cleaning by ultraviolet light is 365nm wavelength
The following ultraviolet photodecomposition effect of organic matter,
Generation of ozone (O ₃ ) from oxygen (O ₂ ) by ultraviolet light of nm or less and generation of atomic oxygen (O ₃ = O ₂ +) due to the ozone decomposing action of ultraviolet light having a wavelength of 240 nm or more.
O), the synergistic effect of the oxidation, decomposition and gasification of the deposits. As a source of ultraviolet light of such a wavelength,
Low pressure mercury lamps (wavelengths 253.7 nm and 184.9 nm) are most suitable, but the surface of the low pressure mercury lamp must always be kept clean.

[0003] As an example of applying such an ultraviolet ray cleaning method to the production of a thermoplastic resin film or the cleaning of a film processing roll of a processing apparatus, there is disclosed a method of removing deposits on a roll proposed in Japanese Patent Publication No. 3-65775. Will be described with reference to FIG. FIG. 3 shows an example in which polyethylene terephthalate or a polyester resin containing the same as a main component is melted, extruded into a sheet, and solidified. In the figure, 1 is a die for discharging a molten resin, and 2 is a sheet-like resin extruded thereby. This sheet-shaped resin 2 is cooled and solidified by the cooling drum 3 and transferred to the next step via the take-off roll 4. Cooling water is usually passed through the inside of the cooling roll 3 and is designed to sufficiently cool the sheet-shaped resin. Reference numeral 5 denotes an adhesion removing device for continuously removing organic substances adhering to the cooling roll 3.

FIG. 4 is a detailed view of the adhesion removing device 5, in which 6 is a lamp for generating ultraviolet rays, and 7 is an enclosure for preventing ozone generated by the ultraviolet rays from diffusing and reducing this effect. Since ozone is harmful to the human body, the entire device 5 is covered with a chamber 8 and a suction blower 9 and an ozone decomposer 10 are connected to the device to discharge ozone out of the system. It is practically preferable to take care not to diffuse. As a method for preventing the diffusion of ozone, the internal pressure of the enclosure 7 may be set to a negative pressure. The distance between the lamp and the roll for generating ultraviolet light is important for the effect of removing the deposits. The shorter the distance, the better, but practically the preferred range is about 2 to 10 mm.

[0005]

A phenomenon in which resin scraps, precipitates or additives in the resin adhere to and accumulate on the surface of the forming roll of the thermoplastic resin film manufacturing or processing apparatus over time. And depending on the surrounding environment,
Oils and fats and organic suspended matter may adhere. However, in order to generate ozone by ultraviolet rays and remove the deposits on the roll surface as in the conventional method for cleaning the roll surface described in FIGS. 3 and 4, the ultraviolet lamp 6 is surrounded and connected to a suction blower 9. With just the structure of the chamber 8,
The inside of the enclosure 7 of the ultraviolet lamp 6 is contaminated with dust or the like, and when the ultraviolet lamp 6 is contaminated, the ultraviolet light does not easily reach the deposits on the roll surface, and the cleaning ability is reduced. In addition, only by sucking scum, dust, etc. on the roll surface from the chamber 8 which double covers the surroundings of the enclosure 7 of the ultraviolet lamp 6, only a part of the decomposed organic material is rotated while keeping on the roll to form a sheet. There is a drawback that the quality of the sheet-like resin product is deteriorated because the sheet-like resin product is involved with the resin. The present invention is intended to solve the above-mentioned conventional problems, and the ultraviolet lamp is contaminated by blowing away the residue and dust from the roll surface by a slit nozzle and sucking and removing the residue and dust decomposed by the ultraviolet lamp and the dust. It is an object of the present invention to provide a roll surface cleaning apparatus that does not have any problem.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is to irradiate the surface of a molding roll used in the production or processing of a thermoplastic resin film with ultraviolet rays, and at the same time, decompose and oxidize organic substances adhering to the roll surface with ozone. In a roll surface cleaning device, a pair of slit nozzles are provided before and after the ultraviolet lamp and its enclosure, and in the direction of roll rotation of the enclosure, and blow high-speed air to the roll surface, and are connected to the slit nozzle and an air pipe. The collected clean air source and the pressurized blower, the enclosure of the ultraviolet lamp and the pair of slit nozzles are collectively housed, and the skirt portion is in close proximity to the roll, and the air in the chamber is sucked out. Composed of exhaust blower and piping to discharge, organic matter decomposed by slag and dust on the roll surface and ultraviolet lamp The debris and dust away blow from the roll surface by the slit nozzle, which is a made as eliminate suck with decomposed gas by the exhaust blower, it is an unit for which a problem solution.

[0007]

Further, the present invention relates to a roll surface cleaning apparatus for irradiating ultraviolet rays to the surface of a molding roll used for manufacturing or processing a thermoplastic resin film, and at the same time, decomposing and oxidizing organic substances attached to the roll surface with ozone. The ultraviolet lamp and its enclosure, a pair of slit nozzles provided before and after in the roll rotation direction of the enclosure and blowing high-speed air to the roll surface, the enclosure of the ultraviolet lamp and the pair of slit nozzles are summarized. It is composed of a chamber in which the skirt is housed and the skirt is close to the roll, and a circulating air pipe and a circulating blower for sucking and circulating the air in the chamber. Organic residue and dust are blown away from the roll surface by the slit nozzle, and these are circulated through the circulation nozzle. It is those made so as to circulate sucking with decomposition gases by word, also connects the suction pipe of the cleaning air with a flow control valve to the suction side piping of the circulation blower in the circulating air pipe,
An exhaust pipe having a flow control valve is connected to a pipe on the high pressure side of the circulation blower, and this is used as means for solving the problem.

[0009]

According to the present invention, the surface of the roll is continuously irradiated with ultraviolet rays during the operation of the mechanical equipment to chemically dissociate organic deposits and simultaneously convert oxygen in the air into ozone by ultraviolet rays. With active oxygen generated from ozone,
Organic substances adhering to the roll surface are decomposed and oxidized to gasify. As a means to remove these wastes and slag and dust adhering to the roll surface, high-speed clean air is blown from the slit nozzle to the roll surface before and after the ultraviolet lamp,
Organic residues and dust decomposed by the ultraviolet lamp are blown away from the roll surface to float in the chamber, and the air in the chamber is sucked out together with the decomposed gas and exhausted by an exhaust blower.

In this cleaning apparatus, since a large amount of air is always flowed into the chamber, there is no possibility that the temperature inside the enclosure of the ultraviolet lamp rises, and the ultraviolet intensity of the ultraviolet lamp does not decrease. In addition, if the circulating air pipe and the circulating blower are provided, only one blower is required, and the amount of air blown out from the slit nozzle and the amount of air sucked in can be easily balanced. By releasing the pressure side of the circulation blower slightly, the pressure in the chamber can be reduced to a negative pressure to prevent leakage of harmful ozone gas. Since the deposit removing device of the present invention operates continuously, the amount of deposit removal per hour is very small, and hence the amount of harmful gas generated inside the ultraviolet lamp enclosure is also small. Is expelled by the shunt of air blown from the slit nozzle,
There is no danger of gas storage in the enclosure to the extent that the action of ultraviolet radiation is reduced.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of the present invention; FIG. First, a first embodiment in which a roll surface cleaning device is attached to a cooling roll of a thermoplastic resin film manufacturing apparatus will be described with reference to FIG. FIG. 1 is a side sectional view of the apparatus, and peripheral devices are shown in a block diagram. In the figure, a molten sheet-like resin 12 is extruded into a sheet from a die 11 of an extruder. The extruded sheet-like resin 12 advances in the direction of the arrow, is cooled and solidified by being wound around a cooling roll 13, moves to a take-up roll 14, and is sent to a subsequent process. Reference numeral 15 denotes an adhering matter removing device,
Is fixed by an external fixing member (not shown) at a position slightly away from the cylindrical surface of the cooling roll 13 on the surface portion of the sheet resin 12 where the sheet resin 12 is not wound.

The adhering substance removing device 15 includes an ultraviolet lamp 16 and its enclosure 17 and a roll 13 of the enclosure 17.
A pair of slit nozzles 24 for blowing high-speed air to the surface of the roll 13 at the front and rear portions in the rotation direction of the lamp, and a chamber 18 for collectively housing the enclosure 17 of the ultraviolet lamp 16 and the pair of slit nozzles 24. Have been. The skirt portion of the chamber 18 is provided with the roll 1
3 is provided in the vicinity. Reference numeral 24 denotes a slit nozzle, in which clean air is supplied from a clean air supply source by being pressurized by a blower 29, and the chamber 18 passes through a filter 22 and an ozone decomposing device 20 to a discharge blower 19. Connected by piping. The blowing capacity of the discharge blower 19 is set such that the total amount of air blown out from the slit nozzle 24 is collected in the chamber 18. 23 is an ultraviolet lamp 16
This is a reflector for effectively utilizing the light amount of the light.

Next, the operation of the embodiment constructed as described above will be described. The sheet-like resin 12 extruded from the die 11 of the extruder of the thermoplastic resin film manufacturing apparatus will be described.
Is rapidly cooled by the cooling roll 13, and on the surface of the cooling roll 13, there is observed a phenomenon that resin debris, precipitates or additives in the resin adhere and accumulate over time. Also, depending on the surrounding environment, fats and oils and organic suspended matter may adhere. The adhering matter removing device 15 continuously irradiates the surface of the cooling roll 13 with ultraviolet rays during the operation of the machine to chemically dissociate the organic adhering matter while the amount adhering to the cooling roll 13 is still small ( At the same time, the low pressure mercury lamp has a wavelength of 253.7 nm, which is suitable). At the same time, the oxygen in the air is converted to ozone by ultraviolet light (the low pressure mercury lamp, which has a wavelength of 184.9 nm, is suitable). The organic deposits adhering to the surface of the substrate 13 are decomposed and oxidized to be gasified to be easily removed.

The adhering matter removing device 15 is provided with a pair of slit nozzles 24 at positions before and after the enclosure 17 of the ultraviolet lamp 16, and the surface of the cooling roll 13 is cleaned at a high speed from the slit nozzles 24. By blowing air, gas generated by oxidizing and decomposing by the action of ultraviolet rays, organic residue, dust, and the like are blown away from the surface of the cooling roll 13 to float in the chamber 18, and together with the decomposed gas, The air can be sucked out by the blower 19 and removed. That is, the waste mixed air removes solid matter in the filter 22 and converts the remaining ozone (O ₃ ) into oxygen (O ₂ ) in the ozonolysis device 20.
It is detoxified and released outside by the blower 19. In this adhering matter removing device 15, air is always
8, the temperature inside the enclosure 17 of the ultraviolet lamp 16 does not increase, and the ultraviolet intensity of the ultraviolet lamp does not decrease. In particular, a temperature control device (not shown) is attached, and the maximum UV lamp output temperature is ± 20.
C., preferably the optimum temperature of the maximum ultraviolet output ± 10 ° C., the life and output of the mercury lamp are further improved. Further, while supplying an appropriate amount of clean air or ozone that does not reduce the efficiency of the ultraviolet lamp into the enclosure 17, the blower capacity of the discharge blower 19 can be set to be larger than the blower capacity of the blower 29 on the pressurized clean air supply side. For example, since the inside of the chamber 18 of the attached matter removing device 15 is always at a negative pressure, there is no possibility that toxic ozone leaks from the surrounding gap. In this embodiment, the chamber receiving the air jetted from the slit nozzle 24 and the chamber around the ultraviolet lamp enclosure 17 are the same, but the ultraviolet lamp is less susceptible to dust from the ratchet coming out of the slit nozzle 24. Needless to say, it may be provided separately for the purpose. However, in terms of cost, it is better to make the chamber around the enclosure 17 and the chamber receiving the air from the slit nozzle 24 the same.

Next, a second embodiment of the present invention will be described with reference to FIG. 2. FIG. 2 is a block diagram showing peripheral devices. In FIG. 2, the air supply blower 29 of FIG. 1 is abolished so that the air blown from the slit nozzle 24 of FIG. 1 is circulated, and the piping is replaced by a circulating air piping, and a circulating blower 19 'is disposed in the middle. . In FIG. 2, the structure from the die 11 of the extruder to the take-off roll 14 and the structure and operation of the attached matter removing device 15 are the same as those of the first embodiment shown in FIG.
Since they are completely the same as the embodiment, their description is omitted. In FIG. 2, reference numeral 22 denotes a filter, and a pipe 2 connected to a pipe between the filter 22 and the blower 19 '.
From 6, clean air is supplied. 25
Is a flow control valve provided on the pipe 26 for controlling the supply amount of clean air. A pipe 27 connected to a pipe on the high pressure side of the blower 19 'is used for exhaust. The pipe 27 is provided with a flow control valve 25' for adjusting the exhaust amount and an ozone decomposing device 20.

Next, the operation of the second embodiment shown in FIG. 2 will be described. The arrangement of the circulating air pipe and one circulating blower 19 'reduces the amount of air blown out of the slit nozzle 24. It is easy to balance the amount of air taken in from the chamber 18. Also, the flow control valve 2 of the pipe 27 connected to the high pressure side of the circulation blower 19 '.
By adjusting 5 'to allow a little air to escape, the pressure in the chamber 18 can be reduced to a negative pressure to prevent leakage of harmful ozone gas. Also, a pipe 27 connected to the high pressure side
Is provided with an ozone decomposing device 20 which decomposes ozone remaining in the air which escapes from the device to detoxify it. External air enters through a gap between the chamber 18 and the roll 13 when the supply air is insufficient.
The flow rate adjusting valve 25 may be adjusted to supply clean air.
Since the deposit removing device 15 of FIG. 2 operates continuously, the amount of deposit removal per hour is very small, and therefore the amount of harmful gas generated in the enclosure 17 of the ultraviolet lamp 16 is also small. Therefore, the harmful gas is expelled by the diverted air blown from the slit nozzle 24, and
Without risk of extent of the gas reservoir to reduce the effects of ultraviolet radiation within, it is needless to say that may be supplied with an appropriate amount of air or ozone in the embodiment similarly to the enclosure 17 of FIG.

[0017]

As described in detail above, according to the present invention, before and after the ultraviolet lamp, the slag and dust on the roll surface are blown off from the roll surface, and the slag and dust blown off from the roll surface and the decomposed slag are separated. Since the entire amount of dust and dust is sucked by the blower, air is also diverted into the ultraviolet enclosure, and the ultraviolet lamp is not contaminated. In addition, since a large amount of air blown out is suctioned and collected in its entirety, no pollution or harmful gas is sprinkled around, and the environment is not impaired. Further, since there is no direct contact with a solid such as a brush, there is no danger of damaging the roll surface.

[Brief description of the drawings]

FIG. 1 is a system diagram of a film manufacturing apparatus equipped with a roll surface cleaning apparatus according to a first embodiment of the present invention.

FIG. 2 is a system diagram of a film manufacturing apparatus equipped with a roll surface cleaning apparatus according to a second embodiment of the present invention.

FIG. 3 is a side view showing a conventional roll surface cleaning apparatus.

FIG. 4 is a cross-sectional view showing details of the attached matter removing means of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Base 12 Sheet-shaped resin 13 Cooling roll 14 Take-off roll 15 Adhered matter removing device 16 Ultraviolet lamp 17 Enclosure 18 Chamber 19 Blower 19 'Circulating blower 20 Ozone decomposer 22 Filter 23 Reflector 24 Slit nozzle 25, 25' Flow control valve 26 , 27 Piping 29 Blower

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-108023 (JP, A) JP-A-2-62224 (JP, A) JP-A-3-290224 (JP, A) Jpn. 128016 (JP, U) Japanese Utility Model Hei 2-117034 (JP, U) Japanese Utility Model Utility Model Hei 4-137820 (JP, U) Japanese Patent Publication 3-65775 (JP, B2) Japanese Patent Publication 45-37874 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B08B 5/00

Claims (3)

(57) [Claims] 1. A roll surface cleaning apparatus for irradiating a surface of a molding roll used for production or processing of a thermoplastic resin film with ultraviolet rays, and at the same time, decomposing and oxidizing organic substances adhering to the roll surface with ozone. A pair of slit nozzles provided before and after the enclosure in the direction of roll rotation of the enclosure and blowing high-speed air to the roll surface; a clean air source and a pressure blower connected to the slit nozzle and an air pipe; And a housing in which the enclosure of the ultraviolet lamp and the pair of slit nozzles are collectively housed, and a skirt portion is formed of a chamber in proximity to the roll, and an exhaust blower and piping for sucking and discharging air in the chamber. The slag and dust on the roll surface and the slag and dust of organic matter decomposed by the ultraviolet lamp are removed by the slit nozzle. A roll surface cleaning apparatus, which blows away the roll surface from the roll surface and sucks and removes them together with the decomposition gas by the exhaust blower. 2. A roll surface cleaning apparatus for irradiating a surface of a molding roll used for production or processing of a thermoplastic resin film with ultraviolet rays, and at the same time, decomposing and oxidizing organic substances adhered to the roll surface with ozone. The enclosure and a pair of slit nozzles that are provided before and after in the roll rotation direction of the enclosure and blow high-speed air to the roll surface, and collectively house the enclosure of the ultraviolet lamp and the pair of slit nozzles, The skirt portion is composed of a chamber in which the roll is in close proximity to the roll, a circulating air pipe and a circulating blower for sucking and circulating air in the chamber, and scum and dust on the roll surface and organic scum decomposed by the ultraviolet lamp. And dust are blown off from the roll surface by the slit nozzle, and these are blown by the circulation blower. Roll surface cleaning apparatus characterized by circulating sucking with solution gas. 3. A cleaning air suction pipe having a flow control valve is connected to a pipe on the suction side of the circulation blower in the circulation air pipe, and an exhaust pipe having a flow control valve is connected to a high pressure pipe of the circulation blower. 3. The roll surface cleaning apparatus according to claim 2, wherein: