WO2012121188A1 - シートの製造方法、シート、包装体およびシートの製造装置 - Google Patents

シートの製造方法、シート、包装体およびシートの製造装置 Download PDF

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Publication number
WO2012121188A1
WO2012121188A1 PCT/JP2012/055511 JP2012055511W WO2012121188A1 WO 2012121188 A1 WO2012121188 A1 WO 2012121188A1 JP 2012055511 W JP2012055511 W JP 2012055511W WO 2012121188 A1 WO2012121188 A1 WO 2012121188A1
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WIPO (PCT)
Prior art keywords
sheet
water
roll
manufacturing
absorbing
Prior art date
Application number
PCT/JP2012/055511
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English (en)
French (fr)
Japanese (ja)
Inventor
博 小高
Original Assignee
出光ユニテック株式会社
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Publication date
Application filed by 出光ユニテック株式会社 filed Critical 出光ユニテック株式会社
Priority to CN2012800126988A priority Critical patent/CN103415385A/zh
Priority to JP2013503529A priority patent/JP5946440B2/ja
Priority to KR1020137026534A priority patent/KR20140015451A/ko
Publication of WO2012121188A1 publication Critical patent/WO2012121188A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/9145—Endless cooling belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/355—Conveyors for extruded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/916—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/9175—Cooling of flat articles, e.g. using specially adapted supporting means by interposing a fluid layer between the supporting means and the flat article

Definitions

  • the present invention relates to a sheet manufacturing method, a sheet, a package, and a sheet manufacturing apparatus in which a molten resin is cooled with water to form a sheet.
  • a method for producing a transparent polypropylene resin sheet a method is known in which a molten resin extruded from a die is rapidly cooled and then heat-treated.
  • a cooling method a method for producing a transparent polypropylene resin sheet by rapidly cooling a molten resin with water and heat-treating the front and back of the obtained sheet has been proposed (see Patent Documents 1, 2, and 3).
  • a highly transparent sheet can be produced at a high speed of 30 m / min or more.
  • water droplets remain on the sheet surface in the heat treatment stage after water cooling, there is a problem that the appearance of the sheet surface is partially deteriorated and the commercial value is lowered. Therefore, in order to avoid the influence of residual water droplets, the operation at a sheet conveying speed of about 10 m / min is unavoidable in practice, and there is still room for improvement in terms of improving production efficiency.
  • Patent Documents 4 and 5 various techniques for removing water droplets on a plastic sheet or film surface have been proposed.
  • a rubber draining roll or a liquid draining roll has been proposed (see Patent Documents 4 and 5). These are methods for draining sheets and films by pinching various rubber rolls.
  • a water absorption roll for removing water droplets (see Patent Document 6).
  • molten resin extruded from a die is rapidly cooled by a metal belt.
  • a water absorption roll is used to remove the water.
  • this invention provides the manufacturing apparatus which implements the manufacturing method of a sheet
  • the present invention relates to a method for producing a sheet by water-cooling an extruded sheet-shaped molten resin, wherein the contact surface with the sheet is elastically deformable with respect to the surface of the sheet after the water-cooling A porous water-absorbing roll is energized.
  • the porous water-absorbing roll whose contact surface with the sheet can be elastically deformed is urged against the surface of the sheet after water cooling, water droplets attached to the sheet surface can be efficiently removed.
  • the water-absorbing roll is a pair, and the water-absorbing roll is urged against the front surface and the back surface of the sheet.
  • the water-absorbing roll is urged against the front side surface and the back side surface of the sheet, so that water droplets can be efficiently removed from both sides of the sheet.
  • the water-cooled sheet is preferably conveyed from below to above.
  • the water held in the water absorption roll is discharged downward when the water absorption roll is urged against the sheet and elastically deformed, and the sheet is separated from the water absorption roll upward, and the water absorption roll is deformed.
  • the holes in the water-absorbing roll are opened, the water-absorbing ability is restored, and water droplets on the sheet surface are removed. Therefore, the sheet conveyance speed can be increased, which greatly contributes to an improvement in sheet productivity.
  • the water-absorbing roll rotates at the same peripheral speed as the conveying speed of the sheet when urging the sheet.
  • the rotational peripheral speed of the water absorption roll is the same as the sheet conveyance speed, so the rotational load is Does not affect the tension of the sheet. Therefore, wrinkles and scratches are less likely to occur even with a thin sheet.
  • the said water absorption roll consists of a porous elastic body comprised around the shaft center, and the said elastic body is a foam which has an open cell. According to the invention of this configuration, since the water absorption roll is made of a predetermined foam, water droplets can be efficiently removed without damaging the sheet surface.
  • the average diameter of the hole formed in the said porous elastic body is 130 micrometers or less, and the said hole is a continuous hole. According to the invention of this configuration, since the average diameter of the holes formed in the porous elastic body is 130 ⁇ m or less, the sheet surface is hardly damaged. Further, the water droplets that remain slightly after passing through the water absorption roll are controlled to a level at which the water droplets are refined and immediately vaporized.
  • a pair of the water absorption rolls is provided so as to sandwich the water-cooled sheet.
  • a pair of water absorption rolls are provided so as to sandwich the water-cooled sheet, so that water droplets adhering to both surfaces of the sheet can be absorbed and removed simultaneously. Therefore, the removal process of adhering water can be made compact.
  • moisture content contained in the said water absorbing roll is urged
  • the squeeze roll is preferably rotatable, and may be a free roll, for example.
  • water is continuously dripped with respect to the said water absorption roll from the upper part of the said water absorption roll.
  • the water that cools the molten resin web contains impurities, and there are also substances that elute from the cooled sheet surface. Therefore, if the sheet is manufactured for a long time, contaminants gradually accumulate in the holes of the water absorption roll. become. When this happens, it is necessary to stop the production of the sheet and replace or clean the water absorption roll.
  • the invention of this configuration since water is constantly dripped onto the water absorption roll, in the squeezing roll, water is always pushed out from the inside of the water absorption roll, and the water absorption roll is automatically cleaned. .
  • the relationship between the thickness (D1) of the elastic body portion in the water absorbing roll and the thickness (D2) of the elastic body portion when the water absorbing roll is urged to the surface of the sheet is expressed by the following formula (1).
  • the value (compression rate) is preferably 1% or more and 50% or less. ((D1-D2) / D1) ⁇ 100% (1)
  • the elastic body portion of the water absorbing roll is deformed so that the thickness of the elastic body portion when the water absorbing roll is urged to the sheet is a predetermined ratio with respect to the original thickness. Water droplets that are well attached to the sheet surface can be removed. If the value of the above formula is smaller than 1%, the water absorption effect may not be sufficiently exhibited. On the other hand, if the value of the above formula is larger than 50%, the elastic body of the water absorbing roll becomes hard and the sheet surface may be damaged, or the elastic recovery force of the elastic body may decrease and the water absorbing power may decrease.
  • the sheet it is preferable to heat-treat the sheet with an endless belt heated after removing water droplets adhering to the sheet surface.
  • an endless belt heated after removing water droplets adhering to the sheet surface since the sheet is heat-treated by the heated endless belt after removing water droplets adhering to the sheet surface, a heat-treated sheet free from a defective phenomenon due to water droplets can be obtained.
  • the sheet of the present invention is manufactured by the manufacturing method described above. According to the sheet of the present invention, it is possible to provide a heat-treated sheet free from a defective phenomenon caused by water droplets in a shorter period of time than a conventional manufacturing method. In particular, it is preferable in a field where transparency and gloss are important for the sheet.
  • the package of the present invention is characterized by using the above-described sheet. According to the package of the present invention, since a sheet having no defective phenomenon caused by water droplets is used, a package having a good appearance can be provided.
  • the present invention is a sheet manufacturing apparatus that forms a sheet by water-cooling a molten resin web, and has an elastically deformable porous water-absorbing roll that rotates while contacting the water-cooled sheet against the surface of the sheet A water drop removing device is provided. According to the sheet manufacturing apparatus of the present invention, water droplets attached to the sheet surface can be efficiently removed by the elastically deformable porous water-absorbing roll that rotates in contact with the surface of the sheet after water cooling.
  • the said water absorption roll is a pair and urges
  • the water-cooled sheet is preferably conveyed from below to above.
  • the water held in the water absorption roll is discharged downward when the water absorption roll is urged against the sheet and elastically deformed, and the sheet is separated from the water absorption roll upward, and the water absorption roll is deformed.
  • the holes in the water-absorbing roll are opened, the water-absorbing ability is restored, and water droplets on the sheet surface are removed. Therefore, the sheet conveyance speed can be increased, which greatly contributes to an improvement in sheet productivity.
  • the said water droplet removal apparatus is equipped with the control apparatus which controls the circumferential speed of the said water absorption roll so that it may become the same as the conveyance speed of the said sheet
  • the water droplet removing device since the water droplet removing device includes the control device that controls the peripheral speed of the water absorbing roll so as to be the same as the sheet conveying speed, the load of rotation of the water absorbing roll on the sheet is reduced. None give.
  • FIG. 1 Schematic of the sheet manufacturing apparatus according to the present embodiment.
  • the polypropylene resin is preferably a highly crystalline polypropylene resin having an isotactic fraction of 0.85 to 0.99, preferably 0.88 to 0.99. If the isotactic fraction is within such a range, it is possible to form a sheet having excellent crystallinity, excellent tensile properties and impact resistance, and a good balance with transparency. On the other hand, if the isotactic pentad fraction is less than 0.85, the tensile modulus may decrease, and if the isotactic pentad fraction exceeds 0.99, The internal haze deteriorates and it is not preferable because it may be difficult to use as a transparent polypropylene sheet.
  • FIG. 1 the manufacturing apparatus 1 of the transparent polypropylene resin sheet which concerns on this embodiment is shown.
  • This manufacturing apparatus 1 includes an extrusion apparatus 11 that melts and kneads a resin composition that is a raw material and extrudes it as a sheet-shaped molten resin 20a, and a first cooling apparatus 12 that cools and solidifies the extruded sheet-shaped molten resin 20a with water.
  • the water droplet removing device 16 that removes water droplets from the sheet-like material (sheet 20) to which the water droplets are attached, the preheating device 13 that reheats the sheet 20 after the water droplets are removed, and the sheet 20 is heat-treated to produce a transparent polypropylene resin.
  • a heat treatment device 14 serving as a sheet 21 and a second cooling device 15 for cooling the sheet after the heat treatment are provided.
  • the extrusion apparatus 11 includes an existing extruder 111 such as a single-screw extruder or a multi-screw extruder, for example, and a T-die 112 for forming a sheet at the tip of the extruder 111.
  • the first cooling device 12 includes a large water tank 120, a first roll 121 and a second roll 122 that sandwich the melt-extruded sheet-like molten resin 20 a disposed in the large water tank 120, and these rolls 121. , 122, the third roll 123 installed closer to the bottom surface of the large water tank 120, the fourth roll 124 provided near the periphery of the large water tank 120 on the preheating device 13 side, and the upper side of the large water tank 120. And a small water tank 125.
  • the sheet-like molten resin 20a extruded by the extrusion device 11 flows down through the slit together with the cooling water constantly supplied to the small water tank 125, and then the rolls 121, 122, 123 Along with the rotation, it is introduced into the large water tank 120, cooled and solidified to form a sheet 20.
  • the water droplet removing device 16 removes water droplets from both surfaces of the sheet 20. There is a need to.
  • the water droplet removing device 16 includes a pair of water absorbing rolls 163A and 163 that urge the sheet 20 that has passed through the rolls 161 and 162 to rotate from the front and back.
  • the water absorption rolls 163A, B are made of a porous elastic body that can be elastically deformed, and are provided with hollow shaft centers 163A1, B1 at the center of rotation.
  • This porous elastic body is a sponge-like elastic body having a large number of continuous pores, and a PVF (polyvinyl formal) foam is particularly preferable in terms of having fine pores.
  • the water-absorbing rolls 163 ⁇ / b> A and 163 ⁇ / b> B are controlled to drive at the same peripheral speed as the conveying speed of the sheet 20. However, as long as there is not much load of the water absorption rolls 163A and B and the sheet can be rotated at the same peripheral speed as the conveyance speed of the sheet 20, a free roll may be used.
  • the pores formed in the porous elastic body are continuous pores, and the average diameter is preferably 130 ⁇ m or less, and more preferably 60 ⁇ m or less.
  • squeezing rolls 164A, B for squeezing out the water contained in the water absorbing roll are urged.
  • the squeezing rolls 164A and B are preferably rotatable, and may be controlled to be the same peripheral speed in synchronization with the peripheral speeds of the water absorbing rolls 163A and B, but may be free rolls.
  • water supply devices 165A, B that can continuously drop water to the water absorption rolls are provided.
  • water receiving trays 166A, B for receiving the water pushed out by the squeezing rolls 164A, B are provided.
  • the sheet 20 from which the water droplets have been removed is discharged through a roll 167.
  • the preheating device 13 is disposed at a position sandwiched between the first and third preheating rolls 131 and 133 provided in parallel at substantially the same height, and the preheating rolls 131 and 133, and is slightly shifted downward.
  • the preheating roll 132 and the pressure auxiliary roll 134 whose peripheral surface is pressed and rolled by the third preheating roll 133 and sandwiches the sheet 20 from above and below are configured.
  • the cooled and solidified sheet 20 is brought into close contact with the peripheral surfaces of the preheating rolls 131, 132, and 133 and is preheated.
  • the heat treatment apparatus 14 includes first, second, and third heating rolls 141, 142, and 143, a cooling roll 144, an endless belt 145, a pressure-contact auxiliary roll 146, and a peeling roll 147.
  • the first and second heating rolls 141 and 142 and the cooling roll 144 are provided in parallel at substantially the same height, and the third heating roll 143 is provided in parallel immediately below the heating roll 142.
  • the peripheral surfaces of the first to third heating rolls 141, 142, and 143 can be heated below the melting point of the polypropylene resin (for example, from about 100 ° C. to 160 ° C.) by an electric heater or steam. Yes.
  • the cooling roll 144 has a structure in which cooling water or the like circulates and is cooled to a desired temperature.
  • the endless belt 145 is wound around the first and third heating rolls 141 and 143 and the cooling roll 144 so as to be disposed inside. Thereby, the endless belt 145 is stretched in a state where it is pushed in from the outside to the inside by the second heating roll 142.
  • the pressure auxiliary roll 146 is pressed and rolled from the upper side of the first heating roll 141 to the circumferential surface.
  • the peeling roll 147 peels the sheet 20 from the endless belt 145 and is provided in the vicinity of the cooling roll 144 with a predetermined interval.
  • the second cooling device 15 is provided in parallel at substantially the same height and cooled by the first, second, and third cooling rolls 151, 152, and 153, and the third cooling roll 153. It is comprised with the press-contact auxiliary
  • the transparent polypropylene resin sheet 21 is manufactured by the manufacturing apparatus 1 described above. First, the raw material resin composition is melt-extruded into a sheet form from the T die 112 by the extrusion apparatus 11 to obtain a sheet-shaped molten resin 20a.
  • the sheet-like molten resin 20a is introduced into the first cooling device 12 and cooled and solidified. That is, the melt-extruded sheet-shaped resin composition 20a flows down together with the cooling water that is constantly supplied to the small water tank 125, and is then guided into the large water tank 120, where the first roll 121 and the second roll 122 are introduced. And is sent to the third roll 123, and is led out of the large-sized water tank 120 by the fourth roll 124 to become a sheet (sheet 20).
  • the sheet 20 is introduced into the water droplet removing device 16 (see FIG. 2). That is, the sheet 20 passes through the rolls 161 and 162 and is sandwiched (biased) between the pair of water absorption rolls 163A and 163B having the same peripheral speed as the conveyance speed, and the water droplets W present on both surfaces of the sheet 20 are removed. The Further, the water absorbed in the water absorbing rolls 163A, B is pushed out by the squeezing rolls 164A, B urged to the lower part of the water absorbing rolls 163A, B, and drops onto the water receiving trays 166A, B.
  • the relationship between the thickness (D1) of the elastic body portion in the water absorbing rolls 163A and B and the thickness (D2) of the elastic body portion when the water absorbing rolls 163A and B are biased to the surface of the sheet 20 is as follows.
  • water droplet removal is performed under an urging condition such that the value (compression ratio) is 1% or more and 50% or less, preferably 5% or more and 30% or less.
  • water is continuously dripped at the water absorption rolls 163A and B from the water supply apparatuses 165A and B provided above the water absorption rolls 163A and B.
  • the sheet 20 from which the water droplets W on both surfaces have been removed by the water absorption rolls 163A and 163B is discharged through the roll 167. Furthermore, the sheet 20 from which the water droplets have been removed is blown with air on both sides by a draining nozzle (air nozzle) (not shown), and the remaining water droplets are removed.
  • a draining nozzle air nozzle
  • the sheet 20 from which the water droplets have been removed is introduced into the preheating device 13 and preheated to a predetermined temperature. That is, the sheet 20 is guided from the fourth roll 124 to the upper peripheral surface of the first preheating roll 131, and above the third preheating roll 133 via the lower peripheral surface of the second preheating roll 132. It is sent to the peripheral surface and is sent out while being sandwiched by the pressure welding auxiliary roll 134.
  • the preheated sheet 20 is introduced into the heat treatment apparatus 14 and heat treated, and the surface becomes smooth. That is, the sheet 20 is guided from the preheating roll 133 to the upper peripheral surface of the first heating roll 141, and is sandwiched and pressed together with the endless belt 145 by the pressing auxiliary roll 146, and is in close contact with the endless belt 145. The sheet 20 is guided to the lower peripheral surface of the second heating roll 142 together with the endless belt 145, and is pressed against the endless belt 145 again by the second heating roll 142.
  • the sheet 20 is sent together with the endless belt 145 above the cooling roll 144, cooled by the cooling roll 144, guided to the peeling roll 147, and peeled from the endless belt 145.
  • the sheet 20 is sufficiently pressed into a mirror-finished endless belt 145 and a roll 142 while being heated below the melting point of the polypropylene resin, and the pressed surface is mirror-transferred and smoothed.
  • the heat-treated sheet 20 is introduced into the second cooling device 15 and cooled to a predetermined temperature. That is, the sheet 20 is guided from the peeling roll 147 to the upper peripheral surface of the first cooling roll 151 and is sent to the third cooling roll 153 via the lower peripheral surface of the second cooling roll 152. And press-contacted by the press-contact auxiliary roll 154.
  • the transparent polypropylene resin sheet 21 of this embodiment will be obtained by the above process.
  • the sheet 20 to which water droplets are attached is conveyed from below to above, and the water absorbing rolls 163A and 163B having the same peripheral speed as the conveying speed of the sheet 20 are further urged against the surface of the sheet 20, the sheet 20 Water droplets adhering to the surface can be efficiently removed. That is, the water held in the water absorption rolls 163A and B is discharged downward when the water absorption rolls 163A and B are urged and elastically deformed with respect to the sheet 20, and the sheet 20 is moved upward from the water absorption rolls 163A and B.
  • the rotational peripheral speed of the water absorption rolls 163A, B is controlled to be the same as the conveyance speed of the sheet 20, so Does not affect the tension of the sheet. Therefore, even if the sheet 20 is thin, wrinkles are unlikely to occur and long-term continuous operation is possible. And since the sheet
  • the thickness (D1) of the elastic body portion in the water absorbing rolls 163A, B and the thickness (D2) of the elastic body portion when the water absorbing roll is urged to the surface of the sheet are within a predetermined range.
  • the value of the above formula is smaller than 1%, there is a possibility that the water absorption port cannot be sufficiently exhibited.
  • the value of the above formula is larger than 50%, the elastic body of the water absorbing roll becomes hard and the sheet surface may be damaged, or the elastic recovery force of the elastic body may decrease and the water absorbing power may decrease.
  • the water absorption rolls 163A and B are made of an open cell foam of hydrophilic PVF, water droplets can be efficiently removed without damaging the surface of the sheet 20.
  • the average diameter of the holes formed in the foam is 130 ⁇ m or less, there is an effect that the surface of the sheet 20 is more difficult to be damaged.
  • the squeezing rolls 164A and B are biased to the lower portions of the water absorbing rolls 163A and B, the water absorbed by the water absorbing rolls 163A and B can be squeezed out. Therefore, it is possible to improve the ability of the water absorption rolls 163A, B to absorb water, and to maintain the water absorption power at a certain level or higher.
  • the squeezing rolls 164A, B are preferably rotatable, and may be free rolls, for example.
  • the water that cools the molten resin sheet 20a contains impurities, and there are substances that elute from the surface of the cooled sheet 20. Therefore, if the production of the sheet is continued for a long time, the holes of the water absorption rolls 163A, B Contaminants gradually accumulate inside. In that case, it is necessary to stop the production of the sheet and replace or clean the water absorption rolls 163A and 163B.
  • water is constantly dripped onto the water absorption rolls 163A, B by the water supply devices 165A, B, so that the water is always pushed out of the water absorption roll by the squeezing rolls 164A, B. The water absorption rolls 163A and 163B are automatically cleaned.
  • the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
  • the pair of water absorbing rolls 163A and 163B are used.
  • the sheet 20 may be sandwiched by providing a water absorbing roll 163C on one surface side of the sheet 20 and providing metal or rubber guide rolls 167A, B, and C on the opposite side.
  • metal or rubber guide rolls 167A, B, and C there are no particular restrictions on the shape and number of guide rolls.
  • the material of the water absorbing rolls 163A, B, and C is not limited to the crosslinked PVA foam, and may be a foamed material such as a thermoplastic resin or a thermoplastic elastomer as long as the water absorbing performance is high and the pores are fine.
  • a pair of draining nozzles is provided on both sides of the sheet 20 after the water droplet removing device 16, but it is not always necessary to provide sufficient water droplet removal.
  • a sponge roll such as PU (polyurethane) may be provided after the water droplet removing device 16 in order to further improve the draining ability.
  • a polypropylene resin sheet was produced under each condition using the production apparatus 1 shown in FIG. 1, and various evaluations were performed.
  • the part except the water droplet removal apparatus 16 among the manufacturing apparatuses 1 in a present Example is based on the manufacturing apparatus of the polypropylene resin sheet described in WO05 / 092593.
  • Example 6 In Example 3, it implemented similarly except not providing a squeeze roll and driving a water absorption roll.
  • Example 7 In Example 3, it implemented similarly except not supplying water to a water absorption roll.
  • Example 8 In Example 3, it implemented similarly except having set the average hole diameter of the foam of the water absorption roll to 130 micrometers.
  • Example 9 In Example 3, it was carried out in the same manner except that the PU sponge roll was not provided and the average pore diameter of the foam of the water absorbing roll was 130 ⁇ m.
  • Example 1 In Example 1, it implemented similarly except not providing a water absorption roll, draining air, and PU sponge roll, and having made the sheet
  • Comparative Example 2 In Comparative Example 1, the same procedure was carried out except that drained air and a PU sponge roll were provided.
  • Comparative Example 3 In Comparative Example 2, the same procedure was performed except that the sheet conveyance speed was set to 13 m / min.
  • Comparative Example 4 In Comparative Example 2, the same procedure was performed except that the sheet conveyance speed was set to 15 m / min.
  • Example 5 In Example 3, the same operation was performed except that the water absorption roll was not driven (free roll) and the sheet conveyance speed was 15 m / min. In this case, the squeeze roll became a load, and the peripheral speed of the water absorption roll was lower than the sheet conveyance speed.
  • Comparative Example 2 it is possible to operate for a long time only by installing draining air and a PU sponge roll and setting the sheet conveying speed to a low speed of 10 m / min. High speed operation as in the embodiment is impossible.
  • Comparative Examples 3 and 4 in which the sheet conveyance speed is increased as compared with Comparative Example 2, the continuous operation performance and the appearance of the sheet are deteriorated.
  • Comparative Example 5 is a case where the driving of the water absorbing roll was stopped in Example 3, but the squeezing roll became a rotational load of the water absorbing roll and wrinkles were generated on the sheet. Also, continuous operation was almost impossible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
PCT/JP2012/055511 2011-03-10 2012-03-05 シートの製造方法、シート、包装体およびシートの製造装置 WO2012121188A1 (ja)

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CN2012800126988A CN103415385A (zh) 2011-03-10 2012-03-05 片材的制造方法、片材、包装体以及片材的制造装置
JP2013503529A JP5946440B2 (ja) 2011-03-10 2012-03-05 シートの製造方法、およびシートの製造装置
KR1020137026534A KR20140015451A (ko) 2011-03-10 2012-03-05 시트의 제조 방법, 시트, 포장체 및 시트의 제조 장치

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CN104015329A (zh) * 2014-06-18 2014-09-03 双钱集团（江苏）轮胎有限公司 压出线下坡部件除水装置
EP3124526A4 (en) * 2014-03-24 2017-11-22 Toray Industries, Inc. Method for manufacturing microporous plastic film

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TWI695961B (zh) * 2017-03-22 2020-06-11 住華科技股份有限公司 除液設備及除液方法
CN108481696A (zh) * 2018-03-30 2018-09-04 广州市旭发新材料有限公司 一种透明过水薄膜的成型机构

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JPH0889921A (ja) * 1994-09-22 1996-04-09 Dainippon Screen Mfg Co Ltd 長尺素材乾燥装置
JP2004106519A (ja) * 2003-08-29 2004-04-08 Placo Co Ltd 結晶性熱可塑性樹脂シート又はフイルムの製造装置
JP2008080270A (ja) * 2006-09-28 2008-04-10 Fujifilm Corp 洗浄液切り乾燥装置、めっき被膜付きフィルムの製造装置及び洗浄液切り乾燥方法
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EP3124526A4 (en) * 2014-03-24 2017-11-22 Toray Industries, Inc. Method for manufacturing microporous plastic film
CN104015329A (zh) * 2014-06-18 2014-09-03 双钱集团（江苏）轮胎有限公司 压出线下坡部件除水装置

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TW201249629A (en) 2012-12-16

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