TW201249629A - Method for producing sheet, sheet, and device for producing packaged body and sheet - Google Patents

Abstract

According to this method for producing a sheet, a molten resin in the form of a sheet is cooled with water and fashioned into sheet (20), the sheet (20) is then transported upward from below, and porous, elastically deformable water-absorbent rolls (163A, 163B) rotating at the same circumferential rate as the rate at which the sheet (20) is transported are urged toward a surface of the sheet (20), whereby water droplets (W) adhering to the surface of the sheet (20) are removed.

Description

[Technical Field] The present invention relates to a method for producing a sheet for forming a sheet by cooling a molten resin with water, a sheet, a package, and a sheet manufacturing apparatus. [Prior Art] As a method for producing a transparent polypropylene resin sheet, there is known a method in which (4) a resin extruded from a die is quenched and then sterilized. For example, as a method of cooling, there is a method in which a transparent polypropylene resin which heat-treats the surface of a sheet obtained by quenching a molten resin by water is prepared (refer to Document 1: 曰本专利特公平7- Japanese Patent No. 64008, Document 2: Japanese Patent Publication No. Sho 62-41457, No. 3: WO 05/092593. In fact, according to this water-cooling method, a highly transparent sheet can be produced at a high speed of m/- or higher. However, if water is cooled, ., , and geography, the residual water droplets on the surface of the sheet may cause local defects in the surface of the sheet and reduce the value of the product. Therefore, in order to avoid the influence of residual water droplets, it is necessary to use the transfer speed of the sheet around the center of the mountain in actual use, and there is still room for improvement in productivity. On the other hand, there are various techniques for removing the water droplets on the surface of the sheet or the film on the surface of the film. For example, 'there is a rubber-made water-removing or liquid-removing roller, etc. (Ref. 4: Japanese special (4), 2_•(10) willow Japanese Laid-Open Patent Publication No. 2003-321235 (A), which is a method for removing water from the film by the clamping of various rubber rolls. Further, a water absorbing roller for removing water droplets has been proposed (refer to Japanese Laid-Open Patent Publication No. Hei 14264). In this technique, the melted resin extruded from the die is quenched by the metal strip 162882.doc 201249629, and the water is sprayed and cooled as the quenching method of the belt, and the water is removed by using the water. Newspaper. Specifically, the surface of the hollow metal roll provided with a plurality of small holes is wound around the back of the tape after the surface of the hollow metal roll is placed, and the vacuum pump is connected to the hollow portion to actively absorb water. In the method of manufacturing the embossed sheet, it is also proposed to use a water absorbing roller having a perforation hole connected to the decompression device in order to remove the water droplets of the embossing material (refer to Japanese Patent Laid-Open No. 2GQ3_G25) No. 4

There are the following problems: the uneven thickness of the absolute thickness of the direction of TD (Dings ransverse Direction, Xigu, Shiren vertical) = (: column such as sheet thickness is 2. ~ above) Water seepage, water droplets cannot be completely removed, and with long-term operation, water = quality: the dissolved matter from the sheet is deposited on the roller, and the surface of the damaged product is woven - more holes == _ accumulated in a slightly thin defect . The ability to enter the second low water absorption is not conducive to the low water absorption capacity when the dissolved material from the resin is mixed with water. The σ is in the water', which contributes to the clogging and is reduced. It is also proposed that the dimeric amine is reported to be dehydrated, etc., but = the wind is in contact with the furnace wire μ μ, and the hot air is dry without removing water droplets. The gas jet nest or the sponge roller cannot be fully removed. 162882.doc 201249629 [Summary of the Invention] Therefore, the object of the present invention is to connect to the 耠 — 种 种 包含 包含 包含 包含 包含 包含 包含 包含 包含 包含 包含 包含 包含 〈 〈 〈 〈 〈 〈 〈 〈 〈 〈 〈 〈 〈 〈 The manufacturing method of the sheet, the sheet, and the packaging using the sheet are y W (manufacturing apparatus for manufacturing the method of the body and the sheet. The present invention is characterized in that: 苴在祖#, 卜V A sheet material preparation method for forming a sheet by extruding a sheet-like molten resin by extrusion, and a porous water absorbing roller which is elastically deformable by a contact surface with the sheet after the water-cooling According to the present invention, the porous water absorbing roller which is elastically deformable by the contact surface of the crepe wire U 〃 sheet is pressed against the surface of the water-cooled sheet, so that the adhesion can be efficiently removed. In the present invention, it is preferable that the water absorbing water rolls are paired, and the front side surface and the back side surface of the sheet are respectively pressed. In the invention of the configuration, the water absorbing material is J J On the front side of the sheet The surface of the surface and the side surface are separately applied to remove water droplets. Therefore, it is preferable that the two sides of the sheet are effectively cooled in the present invention. The water vapor is sent from the lower side to the upper side. When sucking large 鲤mp U tr· and water lightly, when the sheet is dusted and elastically deformed, the water trapped in the water absorbing roller is left below, and the potassium enamel sheet is self-absorbed from the water absorbing sheet upwards. The shape water capacity is restored and the sheet is removed. The water hole is open to absorb water droplets on the surface of the sheet. Therefore, the sheet conveying speed can be increased, which is advantageous for greatly increasing the productivity of the sheet. In the present invention, it is preferable that the water absorbing roller rotates at the same peripheral speed as the sheet conveyance when the sheet is pressed. If the thickness of the sheet is thin, it is easy to apply a slight tension to the sheet. In the invention of this configuration, since the rotational peripheral speed of the water absorbing roller is the same as the conveying speed of the sheet, the rotational load does not affect the tension of the sheet. Because of &, even a thin sheet also In the present invention, it is preferable that the water absorbing roller includes a porous elastic body constituting a periphery of the axial center, and the elastic body is a foam having continuous bubbles. The roller contains a specific foam, so that the surface of the sheet can be effectively removed without damaging the surface of the sheet. In the present invention, it is preferred that the pores formed in the porous elastomer have an average diameter of 130 μm or less, and the pores are continuous. According to the invention of this configuration, since the average diameter of the pores formed in the porous elastic body is 130 μm or less, it is difficult to damage the surface of the sheet, and the water droplets remaining after the water absorbing roller passes are also controlled to be fine. The size of the level of gasification immediately. It is preferable that the water absorbing roller is provided with a pair of the water-cooled sheets sandwiching the water-cooled sheet. In the invention of this configuration, since the pair of water absorbing rolls are provided with a pair of sheets which are water-cooled, the water droplets adhering to both surfaces of the sheet can be simultaneously absorbed and removed. Therefore, the step of removing the adhered water can be simplified. In the present invention, it is preferred that the lower portion of the suction roll is pressed by the squeeze water for extruding the moisture contained in the suction roll. 162882.doc 201249629 «Invented by the invention, since the water squeezing roller is invited to the lower part of the suction roller, the water absorbed by the suction roller can be extruded, so that the force of the water absorbing roller to absorb water can be increased. Preferably, the water p is rotatable, for example, a free roll. In the present invention, it is preferred to continuously drip water from the upper portion of the suction roll relative to the suction roll. Cooling the molten resin The water in the web also contains impurities, and there is also a substance eluted from the surface of the cooled sheet. Therefore, if the sheet is to be produced for a long time, the pollutants gradually accumulate in the pores of the water absorption. Thus, the sheet must be temporarily stopped. In the case of (4), the water droplets are continuously dripped with respect to the water absorbing roller. Therefore, the water is always pushed out from the water absorbing portion to the outside in the water squeezing roller, and the water absorbing roller is automatically performed. In the present invention, it is preferable that the thickness (D1) of the elastomer portion in the water absorbing stick is expressed by the following formula (1) and the elastic portion when the suction is applied to the surface of the sheet. In the case of the relationship of degree (D2), the value (compression ratio) is 1% or more and 5 % or less. ((D1-D2)/D1)x 1〇〇〇/0 (1) According to the invention of the composition ' The thickness of the elastomer portion when the water is applied to the sheet is deformed in a specific ratio with respect to the original thickness, so that the elastic portion of the water absorbing roller is deformed, so that the water droplet adhering to the surface of the sheet can be efficiently removed. If the value of the formula is less than j%, there is a problem that the water absorption effect cannot be fully exerted. On the other hand, if the value of the above formula is more than 5 〇〇/, the elastomer of the water absorption becomes hard and the surface of the sheet is damaged. Or elastomer bomb 162882.doc 201249629 Reduced sexual resilience and low water absorption. In the present invention, 'preferably: after removing the water droplets by the above water absorption, the dewatering is provided to the both sides of the sheet. The mouth nozzle sprays air on both sides of the sheet to remove water droplets remaining on both sides of the sheet. According to the invention of the configuration, after the water droplets are removed by suction, the water is applied to both sides of the sheet. Water spray nozzle sprays air on On both sides of the sheet, it is possible to remove water droplets remaining on both sides of the sheet extremely efficiently. In the present invention, it is preferred to remove the water droplets attached to the surface of the sheet and then heat the endless belt to the sheet. According to the invention of this configuration, since the water droplets are adhered to the surface of the sheet and the sheet is heat-treated by the heated endless belt, a heat-treated sheet which is free from defects caused by water droplets can be obtained. The sheet of the invention is characterized in that it is produced by the above-described production method. According to the sheet of the present invention, it is possible to provide a heat-treated sheet which is inferior in the absence of water droplets in a short time compared to the prior art manufacturing method. In particular, it is preferable in the field of transparency and gloss in the sheet. The package of the present invention is characterized in that the above sheet is used. According to the package of the present invention, since a sheet which is free from the occurrence of water droplets is used, a package having a good appearance can be provided. The present invention is characterized in that it is a device for manufacturing a sheet in which a molten resin web is water-cooled to form a sheet, and includes a water droplet removing crack which has elasticity which is rotated in contact with the surface of the sheet after water cooling. The deformation is 162882.doc 201249629 The pores are light and light. According to the apparatus for producing a sheet of the present invention, the water droplets adhering to the surface of the sheet can be effectively removed by the elastically deformable porous water absorbing roller which is rotated in contact with the surface of the sheet after the water cooling. In the present month, it is preferable that the pair of suction rolls are a pair and that the front side surface and the back side surface of the sheet are pressed. In the invention of this configuration, since the pair of suction rolls are pressed and the front side surface and the back side surface of the sheet can be pressed, the water droplets can be effectively removed from both sides of the sheet. In the present invention, it is preferred that the water-cooled sheet is conveyed from the lower side to the upper side. § During the formation of the month, when the suction roll presses the sheet and elastically deforms, the water held in the suction roll is repelled downward, the sheet leaves upward from the suction roll, and the shape of the deformed suction roll is restored. The water absorption hole, the water absorption capacity is restored, & and the water droplets on the surface of the sheet are removed. Therefore, the conveying speed of the sheet can be increased, which contributes to a significant increase in the productivity of the sheet. In the invention, it is preferable that the water droplet removing device includes a control device that controls a peripheral speed of the water absorbing roller to be the same as a conveying speed of the sheet. According to the invention, the water droplet removing device includes the control device for controlling the peripheral speed of the water absorbing member in the same manner as the conveying speed of the sheet, so that the sheet is not subjected to the rotational load of the water absorbing roller. [Embodiment] Hereinafter, an embodiment of the present invention will be described as a manufacturing method of a transparent polypropylene resin sheet 162882.doc 201249629 and a manufacturing apparatus therefor. Further, as a production example of a transparent polypropylene resin sheet which is water-cooled, it is described in |〇〇5/〇92593. ^ [Polypropylene Resin] As the polypropylene resin, a polypropylene resin having an isotacticity of from 〇85 to 〇99, preferably from 0.88 to G.99, is preferred. When the isocratic fraction is within the above range, a sheet excellent in crystal quality, excellent in tensile properties and impact resistance can be formed, and the balance with transparency is also good. On the other hand, if the isotactic pentad fraction is less than 〇.85, there will be a decrease in the tensile modulus and the like, and if the isotactic pentad fraction exceeds 〇, 99, the quenching step: In the case where the haze is deteriorated, it may be difficult to use it as a transparent polypropylene sheet, so it is not [manufacturing apparatus of a transparent polypropylene resin sheet]. Fig. 1 shows the manufacture of the transparent polypropylene resin sheet of the present embodiment. The manufacturing apparatus 1 includes an extrusion apparatus which melt-kneads a resin composition as a raw material and presses the apparatus 12 as a sheet-like molten resin 20a, which melts the extruded sheet 7 into a material-like molten resin 20 by water. a cooling solid

a water droplet removing device 16 which is attached to a sheet of water droplets (sheet 20) to remove water droplets; a preheating device 13, which removes the water droplets after the water droplets are removed and reheated; In the apparatus 14, the bowl is subjected to heat treatment of the sheet 20 as a transparent polypropylene resin sheet 21; and a second embodiment of the "one & second cold heading device 15" which cools the S-shaped sheet after the heat. The extrusion device 11 includes, for example, an existing I62882.doc 201249629 extruder 111 such as a uniaxially extruded crucible backing machine or a multi-axis extruder, and includes a Τ-type mold for sheet forming at the front end of the extruder U1. The head 112 * the first cooling device 12 includes: a large water tank 12 〇; the first roller 121 and the second roller 122 ′ are equal to the inner side of the large water tank 12 , and sandwich the melt-extruded sheet-like molten resin 20 a ; The third roller 123 is disposed on the bottom surface of the large water tank 12A than the rollers 121 and 122; the fourth roller 124 is disposed near the periphery of the large water tank 12 on the side of the preheating device 13; and the small water tank 125, It is disposed on the upper side of the large water tank 120. With such a configuration, the sheet extruded by the extrusion device The molten resin 20a flows down through the slit together with the cooling water continuously supplied to the small water tank 125. Then, the molten resin 20a is introduced into the large water tank 120 by the rotation of the rolls 121, 122, and 123, and is cooled and solidified to form a sheet. A large amount of water droplets adhere to both sides of the sheet 20 discharged through the roller 124, and if the heat treatment is directly performed, various defects are caused. Therefore, it is necessary to remove water droplets from both sides of the sheet 20 by the water droplet removing device 16. In the second embodiment, the water droplet removing device 16 includes a pair of suction rollers 163 A, B which rotatably press the sheet 20 passing through the rollers 161, 162 from the front and back thereof. The suction rollers 163A, B comprise an elastically deformable porous body. The elastic body includes hollow cores 163A1 and B1 at the center of rotation. The porous elastic body is a sponge-like elastic body having a plurality of continuous holes, and is preferably a PVF (polyvinyl form). The water absorbing rolls 163A, B are controlled to be driven so as to have the same peripheral speed as the conveying speed of the sheet 20. Among them, the load of the water absorbing rolls 163 A, B hardly exists as long as The rotating roller may be a free roller at a peripheral speed 162882.doc 201249629 which is the same as the conveying speed of the sheet 20. The hole formed in the porous elastic body is a continuous hole, and the average diameter thereof is preferably 130 μm or less, more preferably 6 〇 μηη or less. The water absorbing rolls 163 A and the lower portion of the crucible are pressed with water squeezing rollers 164A, B for extruding the moisture contained in the water absorbing roller. The water squeezing rollers 164A, B are preferably rotatable. It can be controlled in such a manner as to be at the same peripheral speed in synchronization with the peripheral speed of the suction rolls 163 A, B, or as a free roll. Further, above the water absorbing rolls 163A, B, water supply means 165 A, B for continuously dropping water with respect to the water suction roll are provided. Below the suction rolls 163A, B, water receiving trays 166A, B for receiving water extruded by the water squeezing rolls 164A, B are provided. The sheet 20 from which water droplets are removed is discharged through the grain 167. The preheating device 13 includes first and third preheating rollers 131 and 133 which are disposed in parallel at substantially the same height, and a second preheating roller 132 which is sandwiched between the preheating reports 13 1 and 1 33. The pressure-adjusting auxiliary roller 134 is pressed against the circumferential surface by the third preheating roller 133 to sandwich the sheet 20 from above and below. Thereby, the cooled-cured sheet 20 is brought into close contact with the peripheral surface of the preheating rolls 131, 132' 133 to be preheated. The heat treatment apparatus 14 is composed of first, second, and third heating rolls 141, 142, and 143, a cooling sheet 144, an endless belt 145, a pressure bonding auxiliary 146, and a peeling roller 147. The first and second heating rolls 141 and 142 and the cooling roll 144 are disposed in parallel at substantially the same height. The third heating roller 143 is disposed in parallel below the heating roller 142. 0 162882.doc 12 201249629 The (fourth) to the third heating roller The circumferential surface of 141, (4) can be heated to below the melting point of the polypropylene resin by electric charge or hot milk or the like (10) such as about: to the boot). On the other hand, the cooling light 144 is a cycle of cooling water or the like and is cooled to a desired temperature. Ring belt (4) to be the first! And the third heating light 141, (4) and the cooling parent (4) are disposed on the inner side so as to be wound around the four (4). Thereby, the endless belt 145 is stretched by being pushed in from the outer side to the inner side by the second heating roller 142. The crimping assistance is pressed and rotated in comparison with the circumferential surface of the U6 from the above-mentioned second heating report 141. Further, the peeling roll M7 peels off the sheet 2G from the endless belt 145, and is provided at a predetermined interval in the vicinity of the cooling pair 144. The second cold portion device 15 is pressed by the first, second, and third cooling reports 151, 152, and 153 which are respectively disposed at substantially the same height in parallel, and is pressed against the third cold: roller 153 to sandwich the sheet. The crimping auxiliary roller 154 is constructed. [Manufacturing Method of Transparent Polypropylene Resin Sheet] (Melt Extrusion Step) The transparent polypropylene resin sheet 21 is produced by the above-described manufacturing apparatus 1, and first, the resin of the raw material is fed from the T-die 112 by the extrusion device 11. The composition was melt-extruded into a sheet form to form a sheet-like molten resin 2〇a. (First cooling step) Next, the sheet-like molten resin 20a is introduced into the first cooling device 12, and is cooled and solidified. In other words, the melt-extruded sheet-like resin composition 2〇a flows down along with the cooling water continuously supplied to the small water tank 12 5 , and then is guided into the large water tank 120 and sandwiched between the first roll 121 and the second roll. Between 122, the third roller 123 is conveyed, and the fourth roller 124 is guided to the outside of the large water tank 120 to form a sheet shape 162882.doc 201249629 (sheet 20) » (water drop removing step) Next, the sheet 20 is placed It is introduced to the water droplet removing device 16 (refer to FIG. 2). That is, the sheet 20 is sandwiched (pressed) by the rolls 161, 162 with one of the peripheral speeds of the same speed as the conveying speed, and the water absorbing rolls 163A, B are removed, thereby removing the water droplets w existing on both sides of the sheet 20. Further, the water absorbed in the inside of the water absorbing rolls 163 and b is squeezed out to the water receiving trays 166A and B by pressing the water squeezing rolls 164A and B at the lower portions of the water absorbing rolls i63A and B. At this time, the thickness (D1) of the elastomer portion in the water absorbing rolls 1 6 3 A, B and the elastomer portion when the water absorbing rolls i63a, B are pressed against the surface of the sheet 20 are expressed by the following formula (1) In the case of the relationship of the thickness (D2), the value (compression ratio) is 1 °/. Above 50% or less is preferably 5. /. Above 3〇. /. The water droplets are removed under the following pressure conditions. ((Dl-D2)/Dl)xl〇〇% (1) Further, the water supply devices 165A and B which have not been placed above the water absorption 163A and B continuously drop to the water absorbing rollers 163 and b. The sheet 20 obtained by removing the water droplet w attached to both surfaces by the water absorbing rolls 163 A, B is discharged by the roller 167. Further, the sheet 20 from which the water droplets are removed is sprayed with air on both sides by a water removing nozzle (air nozzle) (not shown) to remove the remaining water droplets. (Preheating step) Next, the sheet 20 from which water droplets are removed is introduced into the preheating device 13 and preheated to a specific temperature. That is, the 'circumferential surface of the sheet 20 guided from the fourth roller 124 to the upper side of the first preheating view 131' is transmitted to the 162882.doc by the lower surface of the second preheating roll 132 to the 162882.doc •14·201249629 3 preheating roll The circumferential surface above the 133 is sent out by the crimping auxiliary roller 134. (Heat Treatment Step) Next, the preheated sheet 20 is introduced into the heat treatment apparatus 14 and heat-treated, and the surface is smoothed. In other words, the sheet 2 is guided from the preheating roller 133 to the circumferential surface above the first heating roller 141, and is pressed against the endless belt 145 by the pressure-bonding auxiliary roller 146 to be in pressure contact with the endless belt 145. The sheet μ and the endless belt 145 are guided to the circumferential surface below the second heating roller 142, and are pressed against the endless belt 145 by the second heating light 142. Then, the sheet 20 and the endless belt 145 are conveyed above the cooling roll 144, cooled by the cooling roll 144, guided to the peeling roll 147, and peeled off from the endless belt 145. The sheet 20 is sufficiently pressure-bonded to the mirror-finished endless belt 145 and the roller 142 in a state of being heated to a temperature equal to or lower than the melting point of the polypropylene resin, and is smoothed by mirror-transferring the surface to be pressed. Sheet. (Second cooling step) Next, the sheet 20 subjected to the heat treatment is introduced into the second cooling device 15, and is cooled to a specific temperature. In other words, the sheet 2 is guided from the peeling roller 147 to the circumferential surface above the second cooling roller 151, and is conveyed to the third cooling roller 15 via the circumferential surface below the second cooling roller 152 by the pressure assisting 轺_! 5 4 crimping. The transparent polypropylene resin sheet of the present embodiment can be obtained by the above steps. 21 According to the above embodiment, the following effects can be obtained. (υ The sheet 2 to which the water droplets adhered is conveyed from the lower side to the upper side, and the surface of the sheet 20 is pressed to have the same peripheral speed 162882.doc 201249629 of the sheet 20. Therefore, the water droplets adhering to the surface of the sheet 2 can be effectively removed. That is, the water held in the water absorbing rolls 163 and B is repelled downward when the sheet is pressed against the pressure absorbing rolls 163A and B and elastically deformed. The sheet 2 is separated from the water absorbing rolls 163A, B upward, and when the shape of the deformed water absorbing rolls 163A, B is restored, the water absorption capacity of the holes in the water absorbing rolls 163A, B is restored to remove the water droplets on the surface of the sheet 20. Therefore, As a result, the conveyance speed of the sheet 2 is increased, and as a result, the productivity of the transparent polypropylene resin sheet 21 is greatly improved. In particular, when the thickness of the sheet is thin, wrinkles are likely to occur due to the adhesion of water droplets, but in the present embodiment, The rotational peripheral speeds of the water absorbing rolls 163 and 3 are controlled to be the same as the conveying speed of the sheet 20, so that the rotational load does not affect the tension of the sheet. Therefore, even if the sheet 2 is thin, it is difficult to generate wrinkles. Continuous operation for a long period of time. Moreover, since the sheet is "heat-treated" by removing the water droplets adhering to the surface of the sheet 20 by the heated endless belt 145, transparency which is caused by the absence of water droplets can be obtained. Polypropylene resin sheet 21. (2) Further, the thickness (1)" of the elastic portion in the water absorbing rolls 163A, "0" and the thickness of the elastic portion when the water absorbing roller is pressed against the surface of the sheet (D2) It is in a specific range, so that water droplets adhering to the surface of the sheet 2 can be removed efficiently. If the value of the above formula is less than i%, the water absorption effect cannot be sufficiently exhibited. On the other hand, if the value of the above formula is larger than The elastic body of the suction roll will be hardened to damage the surface of the sheet, or the elastic restoring force of the elastic body will reduce the water absorption. (3) Since the water absorption report 163A, B contains the hydrophilic pvF continuous bubble foaming It is possible to remove water droplets efficiently without damaging the surface of the sheet. Further, 162882.doc • 16-201249629 Since the average diameter of the holes formed in the foam is 130 μηι or less, it is more difficult to damage. (4) Since the pair of water absorbing rolls 163 and Β are provided with a pair of water-cooled sheets 2, the water droplets adhering to both sides of the sheet 2 can be simultaneously absorbed and removed. Therefore, the step of removing the adhering water can be simplified. (5) Since the water squeezing roller 164 Α and Β are pressed against the suction roller 163 Α and the lower portion of the crucible, the water absorbed by the water absorbing roller 163 Α and Β can be extruded. The water absorbing roller 163 can improve the ability of absorbing water and absorbing water, and the water absorbing force can be maintained at a level higher than the fixed level. The water squeezing rollers 164 Α and Β are preferably rotatable, for example, can also be free 轺. (6) The molten resin sheet 2 is cooled (the water in the mold also contains impurities, and there is also a substance which is eluted from the surface of the cooled sheet 20, so if the sheet is continuously produced for a long time, it is in the pores of the water absorbing rolls 163, 3 Gradually accumulate pollutants. Thus, it is necessary to temporarily stop the manufacture of the sheet, instead of the water absorbing roller 163, Β, or cleaning. In the present embodiment, the water is continuously dripped with respect to the water absorbing rolls 163 and Β by the water supply device 165, so that the water is always pushed out from the inside of the suction roll to the outside by the water squeezing rolls 164 and ,, automatically The washing of the suction roll 163A and the crucible is performed. (7) In the present embodiment, after the water droplet removing device 16, a pair of water removing nozzles are provided on both sides of the sheet 20 to spray air onto both sides of the sheet 2, so that it can be more preferably removed. Water droplets remaining on both sides of the sheet 2 。. Further, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope of the purpose of the invention are included in the present invention. In the water drop removing device 16 of the above embodiment, a pair of water absorbing 162882.doc -17· 201249629 163A, B is used, but the water-cooled sheet is not necessarily simultaneously removed by lightly absorbing the same portion of the water droplets. For example, as shown in Fig. 3, a water absorbing roller 163C may be provided on one side of the sheet, and metal or rubber guide rollers 167A, B, and C may be provided on the opposite side to sandwich the sheet 2G. The shape and number of the guide rolls are not particularly limited. After this step, the same effect as that of the above embodiment can be exerted by providing the same steps of reversing the position of the suction roll and the guide roll. The material of the water absorbing rolls 163A, B, and C is not limited to a crosslinked pVA (polyvinyl alcohol) foam, and may be a thermoplastic resin or a thermoplastic elastomer as long as the water absorbing property is high and the pores are fine. Foam. In the present embodiment, after the water droplet removing device 16, a pair of water removing nozzles are provided on both surfaces of the sheet 2, but it is not necessary to remove the water droplets as long as the water droplets are sufficiently removed. Moreover, in order to further improve the water-removing ability, a sponge roll such as PU (polyurethane) may be placed after the water droplet removing device 丨6. [Examples] Hereinafter, the present invention will be described in more detail by way of examples, but the invention is not limited thereto. Specifically, a polypropylene resin sheet was produced under various conditions using the manufacturing apparatus shown in Fig. 1 to carry out various evaluations. Further, the portion other than the water droplet removing device 16 in the manufacturing apparatus 1 of the present embodiment is based on the manufacturing apparatus of the polypropylene resin sheet described in WO05/092593. [Examples 1 to 5] Raw materials. (Shares) Purimann polymer polypropylene resin (homogeneous type, 162882.doc • 18-201249629 E103WA) Target sheet thickness: 300 μηι Water absorption roller (pair): Xingkun Diameter: 13 0 mm彡 Material: PVF (polyvinylfurfural) foam (continuous bubble) Foam thickness: 20 mm Average pore diameter of foam · 60 μιη Compression ratio (%): 3, 5, 15, 30, 5 0 Water supply: Continuous water supply to the suction roll (squeeze roll): Pressure on the suction roll PU (polyurethane) sponge roll: set after the suction roll to remove water (water nozzle): set at Sheet conveyance speed (m/min) after the PU sponge roll: 18, 20, 20 or more, 20 or more, 16 [Example 6] In the same manner as in Example 3 except that the water squeezing roller was not provided and the water absorbing roller was not driven Implementation. [Example 7] Example 3 was carried out in the same manner except that the water supply roller was not supplied with water. [Example 8] Example 3 was carried out in the same manner except that the average pore diameter of the foam of the water absorbing roll was set to 13 〇 μηι. [Example 9] Example 3 was carried out in the same manner except that ρυ海 nickel+ 孝孝昆 was not provided, and the average pore diameter of the foam of the absorbing water was set to 130 μm. I62882.doc •19·201249629 [Comparative Example 1] In the example, except that the water absorbing roller, the water-removing air, and the sponge roller were not provided, and the sheet conveying speed was set to 10 m/min, the door was set to 10 m/min. Implemented in the same way. [Comparative Example 2] Comparative example! This is carried out in the same manner except that the dewatered air and the Pu sponge are provided. [Comparative Example 3] Other than m/min, the phase was measured in the same manner as in the second embodiment except that the sheet conveyance speed was set to be the same. [Comparative Example 4] In Comparative Example 2, the sheet conveying speed was set to 15 in the same manner. [Comparative Example 5] In Example 3, the same procedure was carried out except that the water absorbing roller (free press) was not driven and the sheet conveying speed was set to 15 m/mU. Further, in this case, the peripheral speed of the water squeezing roller is reduced, and the peripheral speed of the water absorbing roller is also lower than that of the sheet. [s flattening project • evaluation method] The following items were evaluated and the results are shown in Tables 1 to 3. 162882.doc 201249629 gf#

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Alkali V*1?«?F 162882.doc -23- 201249629 (1) Appearance of the sheet, the actual contents of the sheet obtained in the table are not good. The evaluation criteria are as follows. It makes it a number. The appearance of the water droplets observed in the sheet is not good. The number of defects in the sheet is less than 5 _2. 5 or less: The number of defects in the size of 〇 κ 2 mm or more

6 or more: NG sheet is 〇.5 0 every 1 m2. OK 1 or more: NG (2) Damage to the surface of the sheet For the final sheet, visually damage the surface (m/m2) The number is evaluated on the basis of the following criteria. A: None. B: Several extremely thin micro-damages were confirmed. C ··Confirmed 5 or less damages of 0.5 mm2 or less. D. It is confirmed that there are more than 6 damages below 〇5 mm2, or more than 〇5 mm2. (3) Wrinkles at the time of sheet production were evaluated on the following basis. A · jfe· 〇 B : There is a little slack. c : It is slack but can be manufactured. 162882.doc •24· 201249629 D ··The wrinkles are generated and cannot be manufactured. (4) Number of days of continuous operation The number of days in which the above-mentioned "appearance of sheet material" was evaluated in a stable basis for the product of "ΟΚ" was recorded. The case where the number of consecutive days of operation is less than one day is set to NG. [Evaluation Results] According to the results of Table 1, it is understood that the manufacturing method (manufacturing apparatus) of each of the embodiments "includes a specific water absorbing roller, and controls the driving of the water absorbing roller in such a manner as to achieve the same peripheral speed as the sheet conveying speed. Therefore, there is no problem after the water droplet removing step, and it is possible to continuously operate for a long time. In particular, it is possible to continuously operate for 9 days or more by supplying water droplets to the upper portion of the suction roll. On the other hand, in Comparative Example 1, the water absorbing roller was not used, and the dehydrated gas or the p u sponge was not provided, so that the appearance of the sheet was poor, and it was almost impossible to continuously operate. Further, in Comparative Example 2, the water-removing air and the ρυ sponge roller were provided, and the sheet conveying speed was set to a low speed of 10 m/min, whereby the long-time operation was possible. It is not possible to operate at high speed as in the embodiment. In Comparative Examples 3 and 4 in which the sheet conveying speed was improved as compared with Comparative Example 2, the continuous running performance and the appearance of the sheet deteriorated. Comparative Example 5 is a case where the driving of the water absorbing member was stopped in the third embodiment. The water squeezing roller became a rotating load of the water absorbing roller to produce a richness in the sheet. Moreover, it is almost impossible to operate continuously. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a sheet manufacturing apparatus of the present embodiment. Fig. 2 is an enlarged view of the water droplet removing device in the embodiment of Fig. 1. Fig. 3 is an enlarged view of the water droplet removing device in the other state of the swell. 162882.doc •25· 201249629 [Description of main components] 1 Manufacturing device 11 Extrusion device 12 First cooling device 13 Preheating device 14 Heat treatment device 15 Second cooling device 16 Water droplet removing device 20 Sheet 20a Sheet-like molten resin 21 transparent polypropylene resin sheet 111 extruder 112 die 120 large water tank 121 roller 122 roller 123 roller 124 roller 125 small water tank 131 preheating roller 132 preheating roller 133 preheating roller 134 crimping auxiliary roller 141 heating report 162882. Doc -26. 201249629 142 Heating Pro 143 Heating Mok 144 Cooling Roller 145 Ring Belt 146 Crimping Auxiliary Roller 147 Stripping Roller 151 Cooling Roller 152 Cooling Roller 153 Cooling Roller 154 Crimping Auxiliary Roller 161 Roller 162 Roller 163A Water Absorbing Roller 163A1 Hollow Shaft Heart 163B Water absorption roller 163B1 Hollow shaft 163C Water absorption roller 163C1 Hollow shaft 164A Water squeezing roller 164B Water squeezing roller 164C Water 165A Water supply device 165B Water supply device 165C Water supply device 162882.doc -27 201249629 166A Water tray 166B Water tray 166C Water tray 167 Roller 167A Guide roller 167B Guide roller 167C Guide roller D1 Thick Degree D2 thickness W water drop -28- 162882.doc

Claims (1)

201249629 VII. Patent application garden: A method for manufacturing a sheet material, which is characterized in that the sheet-like smelting resin extruded is water-cooled to form a sheet, and for the water-cooled sheet, by The surface of the sheet is pressed by a porous view which is elastically deformable to the contact surface of the sheet. The method for producing a sheet of the item of the first embodiment, wherein the water absorbing roller is a dust: and a method for producing a sheet of 3. == is applied to the front side surface and the back side surface of the sheet, wherein the water cooling system It is transported from the bottom to the top. 4. The method of producing a sheet according to claim 1, wherein the water-absorbent sheet is pressed upwards when pressed. The circumferential speed at which the conveying speed of the material is the same is the method for producing the shaft material. The water absorbing roller includes a porous elastic body formed around the axial center; and the elastic material has a foam of continuous air bubbles. 6. The elastic body of the method for producing the sheet of the item 5 is formed in the above-mentioned multi-layered continuous hole. The average straightness is called the following, and the above-mentioned hole is connected. 7. As claimed in claim 1 1 y U, the method of manufacturing the water-cooled sheet described above, wherein the above-mentioned water absorbing roller is provided with a pair of "requested items". The water-containing U method of the roll is used to press the lower portion of the water-absorbent roll by the water-squeezing roller for sucking the above-mentioned suction. 162 S82.doc 201249629. The method of manufacturing the sheet of claim 8, wherein The water is continuously dripped from the upper portion of the water absorbing roller with respect to the water absorbing roller. The method for producing the sheet of the first aspect of the invention, wherein the thickness of the elastic portion of the water absorbing roller is expressed by the following formula (1) (D1) In the case of the relationship between the thickness (D2) of the elastomer portion when the water absorption is applied to the surface of the sheet, the value is 1% or more and 50°/. or less ((D1-D2)/D1 〇〇〇 0 0 如 如 如 如 如 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求 请求On both sides of the sheet, thereby removing water droplets remaining on both sides of the sheet 12. The method for producing a sheet of a requester, wherein after the water droplets attached to the surface of the sheet are removed, the sheet is heat-treated by a heated endless belt. 13· - Sheets' characteristics It is manufactured by the manufacturing method according to any one of the claims. 14. A packaging body characterized by using the sheet as claimed. 15. A sheet manufacturing apparatus characterized by And (4) the resin web is water-cooled to form a sheet, and includes a water droplet removing device having an elastically deformable porous water absorbing roller that rotates in contact with the surface of the sheet after the water cooling. In the sturdy device of the sheet of 15 wherein the water absorbing roller is - ' ' and the front side surface of the sheet is pressed, the surface of the recording surface and the side surface of the moon surface are pressed. 17. If the weather is 15 or 1 6 sheet of the 袢 袢 袢 , , 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 162 The removal device includes a control device, Control means for controlling the circumferential velocity of the suction roller so that the sheet material of the same conveyance speed. 162882.doc