CN115339076A - Apparatus for manufacturing resin film and method for manufacturing resin film - Google Patents

Apparatus for manufacturing resin film and method for manufacturing resin film Download PDF

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Publication number
CN115339076A
CN115339076A CN202210511076.5A CN202210511076A CN115339076A CN 115339076 A CN115339076 A CN 115339076A CN 202210511076 A CN202210511076 A CN 202210511076A CN 115339076 A CN115339076 A CN 115339076A
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CN
China
Prior art keywords
upstream
resin film
guard plate
downstream
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210511076.5A
Other languages
Chinese (zh)
Inventor
田熊幸治
池永启昭
藤泽健一
大前通宏
山下裕司
植野俊明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Toyo Kohan Co Ltd
Original Assignee
Nitto Denko Corp
Toyo Kohan Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Denko Corp, Toyo Kohan Co Ltd filed Critical Nitto Denko Corp
Publication of CN115339076A publication Critical patent/CN115339076A/en
Pending legal-status Critical Current

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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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • 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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets

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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)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Abstract

The invention provides a film manufacturing device which can inhibit the generation of uneven thickness of a resin film by inhibiting the generation of the whole air flow in a forming unit. A resin film manufacturing device (1) is provided with a forming unit (20) for forming resin into a film shape, wherein the forming unit (20) comprises: a die (30) having a discharge port (31) for extruding a molten resin (101) in the form of a film; a casting roll (42) which is disposed below the mold (30) and cools and solidifies the molten resin (101) discharged from the discharge port (31); cooling rolls (43, 44) and a peeling roll (45) which are arranged at the downstream side of the casting roll (42) and are in contact with the resin film (102) cooled by the casting roll (42); a cover (50) and a wind guard plate (60) which are arranged at the upstream side of the casting roll (42); and a wind-prevention plate (70) disposed below the peeling roller (45).

Description

Apparatus for manufacturing resin film and method for manufacturing resin film
Technical Field
The present invention relates to a resin film manufacturing apparatus for manufacturing a resin film and a resin film manufacturing method for manufacturing a resin film using the manufacturing apparatus.
Background
As a method for producing a resin film, a T-die casting method is known as one of melt extrusion molding methods. In the T die casting method, the resin film may have uneven thickness due to the fluctuation of the molten film in a region between the die and the cooling roll (hereinafter referred to as an "air gap"). When such thickness unevenness occurs in the resin film, the uniformity of the thickness of the resin film is deteriorated, and therefore, particularly when the resin film is used for optical applications, the quality such as optical characteristics may be greatly affected.
In order to suppress such a fluctuation of the molten film, in the apparatus for producing a resin film of patent document 1, a control plate is provided above the nip roller to prevent air blown out from an air blowing device for cooling the nip roller from entering an air gap along the surface of the nip roller.
In the apparatus for manufacturing a resin film of patent document 2, a pair of shielding plates covering both ends of the resin film in the width direction are provided between the discharge port of the mold and the surface of the cooling roll, thereby suppressing the collision of the molten film with the ascending air current generated by the heat dissipation of the mold.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-007803
Patent document 2: japanese laid-open patent publication No. 2009-154518
Disclosure of Invention
Problems to be solved by the invention
However, when the resin film is manufactured, the mold and the roll constituting the molding unit of the manufacturing apparatus are at high temperatures, and the resin film itself during the manufacturing is also at high temperatures. Therefore, a global air flow is generated inside the forming unit by the heat emitted from such a high-temperature substance, and the molten film may be shaken in the air gap by the air flow. In contrast, in both of the above patent documents 1 and 2, attention is paid only to a local air flow in the molding unit, and no study is made on the entire air flow generated in the molding unit as described above.
Accordingly, an object of the present invention is to provide a resin film manufacturing apparatus and a resin film manufacturing method that can suppress the occurrence of thickness unevenness in a resin film by suppressing the occurrence of air flow in the entire molding unit.
Means for solving the problems
The present inventors have found that the above object can be achieved by suppressing the inflow of air from the outside of the forming unit to below the roller, and have completed the present invention.
That is, according to the present invention, there is provided an apparatus for producing a resin film, comprising a molding unit for molding a resin in a film shape, the molding unit comprising: a die for extruding a molten resin in a film form; a casting roll disposed below the mold, for cooling and solidifying the molten resin discharged from a discharge port of the mold; a downstream roll which is disposed downstream of the casting roll and which is in contact with the resin film cooled by the casting roll; an upstream wind guard plate disposed upstream of the casting roll; and a downstream side wind guard plate disposed below the casting roll or the downstream side roll.
In the apparatus for producing a resin film according to the present invention, the molding unit may further include a contact roller that is disposed so as to face the casting roller and that pinches the molten resin discharged from the discharge port together with the casting roller, and the upstream wind-guard plate may include: a 1 st upstream wind guard plate disposed upstream of the contact roller; and a 2 nd upstream side wind-prevention plate disposed below the contact roller.
In the apparatus for manufacturing a resin film according to the present invention, the 2 nd upstream side wind-guard plate may be supported by a base portion of the molding unit so as to be able to tilt.
In the apparatus for producing a resin film according to the present invention, the 2 nd upstream wind-guard plate may be disposed below or upstream of a center axis of the contact roller, the 2 nd upstream wind-guard plate may be inclined toward the upstream side, and the contact roller may rotate in a direction in which a lower portion of the contact roller rotates from the downstream side toward the upstream side.
In the apparatus for manufacturing a resin film according to the present invention, the 2 nd upstream wind-guard plate may include: an upstream main body; and an upstream-side tip portion disposed in the vicinity of the contact roller with respect to the upstream-side main body portion, the upstream-side tip portion being made of a material different from that of the upstream-side main body portion, and the upstream-side tip portion being made of a resin material.
In the apparatus for manufacturing a resin film according to the present invention, the 2 nd upstream wind-guard plate may have a position adjustment mechanism capable of adjusting a relative position of the upstream tip portion with respect to the upstream main body portion.
In the apparatus for producing a resin film according to the present invention, the 2 nd upstream wind-guard plate may have a convex portion corresponding to the small diameter portion of the contact roller.
In the apparatus for producing a resin film according to the present invention, the 2 nd upstream wind-guard plate may have an upstream window portion below the contact roller and the casting roller, the upstream window portion being visually recognizable.
In the apparatus for manufacturing a resin film according to the present invention, the downstream roll may include: a cooling roll which is disposed downstream of the casting roll and cools the resin film; and a peeling roller that peels the resin film from the cooling roller, wherein the downstream wind-prevention plate is disposed below the cooling roller or the peeling roller.
In the apparatus for manufacturing a resin film according to the present invention, the downstream wind guard plate may be supported by a base portion of the molding unit so as to be able to tilt.
In the apparatus for manufacturing a resin film according to the present invention, the downstream wind guard plate may include: a downstream side main body part; and a downstream-side tip portion disposed in the vicinity of the downstream-side roller with respect to the downstream-side main body portion, the downstream-side tip portion being formed of a material different from a material of the downstream-side main body portion, and the downstream-side tip portion being formed of a resin material.
In the apparatus for producing a resin film according to the present invention, the downstream wind guard plate may have a downstream window portion through which a lower portion of the downstream roller can be visually recognized.
Further, according to the present invention, there is provided a method of manufacturing a resin film, wherein the resin film is manufactured by controlling generation of an entire air flow in the molding unit by using any one of the above-described manufacturing apparatuses.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the upstream and downstream wind-guard plates suppress the inflow of air from outside the molding unit to below the roller, and the generation of the entire air flow in the molding unit can be suppressed, so that the occurrence of thickness unevenness in the resin film can be suppressed.
Drawings
Fig. 1 is an overall configuration diagram showing an example of a thin film manufacturing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of a molding unit according to an embodiment of the present invention.
Fig. 3 is a front view of the molding unit according to the embodiment of the present invention, and is a view showing a state in which a cover is opened.
Description of the reference numerals
1. A thin film manufacturing apparatus; 10. an extruder; 11. a hopper; 20. a shaping unit; 21. a base part; 22. a side wall; 23. a bracket; 24. a magnet; 30. a mold; 31. an outlet port; 41. a contact roller; 411. a main body portion; 412. a small diameter part; 42. casting a roller; 43. 44, a cooling roller; 45. a peeling roller; 50. a cover; 51. a hinge; 52. a window portion; 60. a windbreak panel; 61. a main body portion; 62. a front end portion; 621 to 623, 1 st to 3 rd tip parts; 63. a position adjustment mechanism; 631. a long hole; 632. a fastening member; 64. a position adjustment mechanism; 65. a window portion; 66. a hinge; 70. a windbreak panel; 71. a main body portion; 72. a front end portion; 73. a window portion; 74. a hinge; 80. a coiler; 100. a resin; 101. melting the resin; 102. a resin film.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is an overall configuration diagram showing an example of a film production apparatus 1 according to the present embodiment, fig. 2 is a schematic sectional view showing an example of a forming unit 20 according to the present embodiment, and fig. 3 is a front view showing the forming unit 20 according to the present embodiment, and is a view showing a state in which a cover 50 is opened.
The film manufacturing apparatus 1 of the present embodiment is an apparatus for manufacturing the resin film 102. The application of the resin film 102 produced by the film production apparatus 1 is not particularly limited, and optical applications can be exemplified. Specific examples of the resin constituting the resin film 102 are not particularly limited as long as they are thermoplastic resins, and examples thereof include acrylic resins, polyolefin resins, polyester resins, polycarbonate resins, and ABS resins. Among them, as the transparent resin for the optical film, acrylic resin, polyethylene terephthalate (PET), polycarbonate (PC), cyclic olefin resin (COC), and the like are preferably used.
As shown in fig. 1, the film production apparatus 1 includes an extruder 10, a forming unit 20, and a winder 80.
The extruder 10 heats the resin 100, which is fed into the cylinder through the hopper 11, by a screw, and melts the resin 100. The molten resin 101 is continuously supplied to the die 30 of the molding unit 20 connected to the extruder 10. As the extruder 10, either a single-screw extruder or a twin-screw extruder may be used.
The molding unit 20 is a unit for molding the molten resin 101 supplied from the extruder 10 into a film shape. As shown in fig. 2, the molding unit 20 includes a mold 30, a contact roll 41, a casting roll 42, cooling rolls 43 and 44, and a peeling roll 45. The number of cooling rollers is not particularly limited to the above, and may be arbitrarily set according to the type of resin constituting the resin film, and the cooling rollers may be omitted.
The die 30 is a so-called T-die for melt extrusion molding. The die 30 has a discharge port 31 for discharging the molten resin 101 continuously supplied from the extruder 10. The molten resin 101 is extruded in a thin film form through the outlet 31.
The 5 rollers 41 to 45 of the forming unit 20 are rotatably supported by a side wall 22 (see fig. 3) erected on a base portion 21 of the forming unit 20, and can be driven and rotated by a power transmission mechanism (not shown). The 5 rollers 41 to 45 are arranged in order from the upstream side toward the downstream side of the forming unit 20. In the present embodiment, "upstream side" and "downstream side" refer to the arrangement direction of the rollers corresponding to the conveying direction of the resin film, and in fig. 2, "upstream side" corresponds to the left direction of the sheet (the front side of the forming unit 20) and "downstream side" corresponds to the right direction of the sheet (the rear side of the forming unit 20).
The contact roller 41 is a roller having a metal surface, and a cooling mechanism for circulating a refrigerant is provided inside the metal surface. On the other hand, the casting rolls 42 are metal rolls having higher rigidity than the contact rolls 41, and are provided with a cooling mechanism for circulating a refrigerant therein. The contact roll 41 and the casting roll 42 are disposed below the discharge port 31 of the mold 30 so as to face each other, and the molten resin 101 discharged from the discharge port 31 of the mold 30 is nipped and cooled to be solidified.
The molding unit 20 may be provided with a blowing nozzle or a suction nozzle as described in patent document 2. The air blowing nozzle or the suction nozzle forms an air flow flowing in a direction parallel to or perpendicular to the molten resin 101 in the vicinity of the molten resin 101 in the air gap AG (the region from the discharge port 31 of the mold 30 to the casting roll 42).
The cooling rolls 43 and 44 are metal rolls having a cooling function, similarly to the casting roll 42. The resin film 102 formed by the contact roller 41 and the casting roller 42 is conveyed to the cooling rollers 43 and 44. The resin film 102 is cooled in multiple stages by passing through the casting roll 42 and the two cooling rolls 43 and 44.
The peeling roller 45 is a metal or resin roller. The peeling roller 45 peels the resin film 102 from the cooling roller 44 at the most downstream. As shown in fig. 1, the resin film 102 peeled by the peeling roller 45 is fed from the molding unit 20 and wound into a roll shape by the winder 80. Alternatively, the resin film 102 peeled by the peeling roller 45 may be fed to the stretching apparatus instead of the winder 80.
As shown in fig. 2, the molding unit 20 of the present embodiment further includes a cover 50 and windshields 60 and 70. The cover 50 of the present embodiment corresponds to an example of the "1 st upstream side wind guard plate" in the present invention, the wind guard plate 60 of the present embodiment corresponds to an example of the "2 nd upstream side wind guard plate" in the present invention, and the wind guard plate 70 of the present embodiment corresponds to an example of the "downstream side wind guard plate" in the present invention.
The cover 50 is disposed upstream of the contact roller 41. The cover 50 is provided at a front portion of the forming unit 20 so as to cover a region from the base portion 21 of the forming unit 20 to above the contact roller 41. The cover 50 is supported by the base portion 21 via a hinge 51, and can open and close a front portion of the molding unit 20.
The cover 50 has a window 52 through which the inside of the molding unit 20 can be visually checked. The window 52 is formed by fitting a transparent resin member into an opening formed in the cover 50.
The wind guard plate 60 on the upstream side is a plate-shaped member disposed below the contact roller 41. The wind guard plate 60 separates the space between the base portion 21 of the forming unit 20 and the contact roller 41. The wind guard 60 includes a main body 61 and a tip portion 62, and the tip portion 62 is disposed in the vicinity of the contact roller 41 with respect to the main body 61. Further, a gap is secured between the end of the tip portion 62 and the surface of the contact roller 41, and the end of the tip portion 62 does not contact the surface of the contact roller 41.
The main body portion 61 is made of a metal material. In contrast, the distal end portion 62 is made of a resin material such as nylon or heat-resistant rubber. By forming the distal end portion 62 of a resin material, even if the wind-guard plate 60 should contact the contact roller 41, damage to the contact roller 41 and the wind-guard plate 60 can be suppressed.
The main body 61 of the wind guard plate 60 has a window 65 through which the lower portions of the contact roller 41 and the casting roller 42 can be visually observed. The window 65 is formed by fitting a transparent resin member into an opening formed in the windshield 60.
As shown in fig. 3, the front end 62 of the windshield 60 includes a 1 st front end 621, a 2 nd front end 622, and a 3 rd front end 623. The 1 st tip 621 is disposed in the center of the windshield 60. The 2 nd leading end 622 is disposed outside the 1 st leading end 621. The 3 rd tip portion 623 is disposed further outside the 2 nd tip portion 622, and constitutes both ends of the tip portion 62. Here, the contact roller 41 includes a main body 411 and a small diameter portion 412, the main body 411 includes a portion in contact with the resin film 102, and the small diameter portion 412 is located at both ends of the main body 411 and supports the main body 411. The 3 rd leading end portion 623 is disposed so as to correspond to the small diameter portion 412 of the contact roller 41.
The 1 st tip 621 is fixed to the main body 61 by a fixing member such as a bolt. The 1 st tip 621 may be movable relative to the main body 61 by a position adjustment mechanism described later.
On the other hand, the 2 nd tip portion 622 is attached to the main body portion 61 via the position adjustment mechanism 63. The position adjustment mechanism 63 includes a long hole 631 formed in the 2 nd tip end portion 622 along the vertical direction, a circular hole (not shown) formed in the body portion 61 so as to face the long hole 631, and a fastening member 632 such as a bolt inserted through the long hole 631 and the circular hole. The 2 nd tip 622 can be moved relative to the body 61 in the vertical direction by the position adjustment mechanism 63, and the size of the gap between the windshield 60 and the contact roller 41 can be adjusted.
Similarly, the 3 rd tip end portion 623 is also attached to the main body portion 61 via the position adjustment mechanism 64. The position adjustment mechanism 64 has the same structure as the position adjustment mechanism 63 described above. The 3 rd tip end portion 623 can be moved relative to the body portion 61 in the vertical direction by the position adjustment mechanism 64, and the size of the gap between the windshield 60 and the contact roller 41 can be adjusted.
The 3 rd end 623 projects upward beyond the other ends 621 and 622 to form a projection of the wind guard 60. The convex portion is close to the small diameter portion 412 of the contact roller 41, and the sealing between the base portion 21 of the molding unit 20 and the contact roller 41 is improved by the wind guard plate 60.
In the present embodiment, as shown in fig. 2, the wind guard plate 60 is supported by the base portion 21 of the molding unit 20 via a hinge 66 and can be tilted. By thus making the wind guard plate 60 reversible, maintenance inside the forming unit 20 is facilitated.
The windshield 60 can be tilted toward the upstream side by the hinge 66. On the other hand, the rotation direction of the contact roller 41 is a direction in which the lower portion of the contact roller 41 rotates from the downstream side to the upstream side, and is clockwise in fig. 2. That is, in a portion where the wind guard plate 60 and the contact roller 41 face each other, the direction in which the wind guard plate 60 falls coincides with the rotation direction of the contact roller 41. Therefore, even when the resin film 102 is wound around the contact roller 41 and the resin film 102 comes into contact with the wind-guard plate 60, damage to the contact roller 41 or the wind-guard plate 60 can be suppressed by tilting the wind-guard plate 60 by the hinge 66.
As shown in fig. 3, a bracket 23 is provided on the side wall 22 of the molding unit 20. The bracket 23 is fixed to the side wall 22 so as to protrude toward the inside of the forming unit 20. The bracket 23 is disposed to face both ends of the windshield 60. A magnet 24 is attached to the front end of the bracket 23. By holding the wind guard plate 60 made of metal by the magnet 24, the wind guard plate 60 can be easily tilted even when the resin film 102 wound around the contact roller 41 comes into contact with the wind guard plate 60.
In addition, the position of the windshield 60 is only required to be setThe lower side of the contact roller 41 is not particularly limited, but is preferably lower than the center axis CL of the contact roller 41 so that the wind guard plate 60 can be tilted toward the upstream side 0 The lower side of (see fig. 2) is located on the upstream side. In addition, from the viewpoint of avoiding contact between the wind-prevention plate 60 and the contact roller 41, the position where the wind-prevention plate 60 is disposed is more preferably the center axis CL of the contact roller 41 0 Just below.
The wind guard plate 70 on the downstream side is a plate-shaped member disposed below the peeling roller 45. As shown in fig. 2, the wind guard plate 70 separates a space between the base portion 21 of the forming unit 20 and the peeling roller 45. The wind guard plate 60 also includes a main body 71 and a tip end portion 72, similarly to the wind guard plate 60 on the upstream side, and the tip end portion 72 is disposed in the vicinity of the peeling roller 45 with respect to the main body 71. Further, a gap is secured between the end of the tip portion 72 and the surface of the peeling roller 45, and the end of the tip portion 72 does not contact the surface of the peeling roller 45.
The main body portion 71 is made of a metal material. In contrast, the distal end portion 72 is made of a resin material such as nylon or heat-resistant rubber. By forming the distal end portion 72 of a resin material, even if the wind-guard plate 70 should come into contact with the peeling roller 45, damage to the peeling roller 45 and the wind-guard plate 70 can be suppressed.
The main body 71 of the wind guard plate 70 has a window 73 through which the lower portions of the cooling rollers 43 and 44 and the peeling roller 45 can be visually recognized. The window 73 is formed by fitting a transparent resin member into an opening formed in the windshield 70.
In the present embodiment, the wind guard plate 70 is supported by the base portion 21 of the molding unit 20 via a hinge 74, and is of a tiltable type. From the viewpoint of maintenance in the molding unit 20, the wind guard plate 70 on the downstream side can be tilted toward the downstream side by the hinge 74. Similarly to the wind guard plate 60 on the upstream side, a bracket is provided on the side wall 22 of the forming unit 20, and the wind guard plate 70 is held by a magnet attached to the front end of the bracket, which is not particularly shown.
In addition, similarly to the wind guard plate 60 on the upstream side, a convex portion corresponding to the shape of the peeling roller 45 may be formed on the wind guard plate 70. The distal end portion 72 may be movable in the vertical direction relative to the main body portion 71 by a position adjustment mechanism.
The position of the wind guard plate 70 is not particularly limited as long as it is below the peeling roller 45, but is preferably set to be lower than the center axis CL of the peeling roller 45 so that the wind guard plate 70 can be tilted to the downstream side 1 The lower side of the flow path (see fig. 2) is located on the downstream side. In addition, from the viewpoint of avoiding contact between the wind guard plate 70 and the peeling roller 45, the installation position of the wind guard plate 70 is more preferably the center axis CL of the peeling roller 45 1 Just below.
In the present embodiment, the wind guard plate 70 on the downstream side is disposed below the peeling roller 45, but the position where the wind guard plate 70 on the downstream side is disposed is not particularly limited as long as it is below the roller on the downstream side of the contact roller 41. Specifically, the wind guard plate 70 on the downstream side may be provided below any one of the casting roll 42, the cooling roll 43, and the cooling roll 44. In addition, from the viewpoint of preventing air from flowing into the molding unit 20 from the outside, the wind guard plate 70 on the downstream side is preferably disposed below the peeling roller 45.
Here, as described above, in the production of the resin film, the mold, and the roll are heated at high temperatures. Therefore, in the film production apparatus having the conventional structure, the ascending air flow generated by the heat emitted from these high-temperature substances generates a large air flow in the forming unit as follows: air below the rollers is drawn over the rollers via the gaps or spaces between the rollers, and air is drawn under the rollers from outside the forming unit.
Further, as a specific example of the gap between the rolls, a gap between the rolls formed on the outer side of the resin film in the contact roll and the casting roll can be cited. Specific examples of the space between the rolls include a space formed between the small diameter portion of the contact roll and the small diameter portion of the casting roll, a space formed between the casting roll and the cooling roll, a space formed between the cooling rolls, and a space formed between the cooling roll and the stripping roll.
In contrast, in the present embodiment, the cover 50 is provided at the front portion of the molding unit 20, and the wind guard 60 is provided below the contact roller 41, thereby suppressing the inflow of the outside air into the molding unit 20 from the front of the molding unit 20. Similarly, the wind guard plate 70 is provided below the peeling roller 45, thereby suppressing inflow of outside air into the molding unit 20 from behind the molding unit 20.
In this way, the cover 50 and the windbreak plates 60 and 70 suppress the entry of outside air from the outside to the lower side of the rollers 41 to 45 of the molding unit 20, and thus the flow of air existing below the rollers 41 to 45 can be blocked, and the suction-up due to the updraft caused by a high-temperature object can be suppressed. Therefore, generation of global air flow in the molding unit 20 can be suppressed, and generation of fluctuation of the molten film in the air gap can be suppressed, and thus generation of thickness unevenness of the resin film can be suppressed.
In the film production apparatus 1, the film production apparatus 1 may be operated with the cover 50 opened in order to check the state in the forming unit 20 and perform maintenance of the rollers. Therefore, in the present embodiment, both the cover 50 and the wind guard plate 60 are disposed upstream of the casting roll 42, and a double wind guard structure is adopted. Thus, even when the film manufacturing apparatus 1 is operated with the cover 50 open, the wind guard plate 60 can prevent outside air from entering from below the front rollers 41 to 45 of the molding unit 20, and the wind guard plate 60 can also function as a safety cover.
The embodiments described above are described for ease of understanding the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above-described embodiments is intended to include all design modifications and equivalents that fall within the technical scope of the present invention.
In the above-described embodiment, the example in which the present invention is applied to the film production apparatus 1 for producing the single-layer resin film 102 has been described, but the present invention is not particularly limited thereto. For example, the present invention can be applied to a film manufacturing apparatus for manufacturing a multilayer resin film. Alternatively, the present invention may be applied to a film manufacturing apparatus for manufacturing a composite film having a central portion made of a 1 st resin and both end portions made of a 2 nd resin different from the 1 st resin.
In the above-described embodiment, the forming unit 20 includes both the cover 50 and the wind guard 60, but is not particularly limited thereto. The forming unit 20 may be provided with only the cover 50 and no wind guard 60. Alternatively, the molding unit 20 may be provided with only the windshield 60 and no cover 50.
In the above-described embodiment, the present invention has been described as being applied to the thin film manufacturing apparatus of the contact roll system using the contact roll, but the present invention is not particularly limited thereto, and the present invention may be applied to a so-called casting roll system not using the contact roll. In this case, the forming unit includes the cover 50 and the wind guard plate 70 on the downstream side as the wind guard plate, and does not include the wind guard plate 60 on the upstream side.

Claims (13)

1. An apparatus for manufacturing a resin film, wherein,
the resin film manufacturing apparatus includes a molding unit for molding a resin into a film shape,
the molding unit includes:
a die for extruding a molten resin in the form of a film;
a casting roll disposed below the mold, for cooling and solidifying the molten resin discharged from a discharge port of the mold;
a downstream roll disposed downstream of the casting roll and contacting the resin film cooled by the casting roll;
an upstream wind guard plate disposed upstream of the casting rolls; and
and a downstream side wind guard plate disposed below the casting roll or the downstream side roll.
2. The resin film manufacturing apparatus according to claim 1, wherein,
the molding unit further includes a contact roller disposed to face the casting roller, and nipping the molten resin discharged from the discharge port together with the casting roller,
the upstream side wind-guard plate includes:
a 1 st upstream wind guard plate disposed upstream of the contact roller; and
and a 2 nd upstream side wind-prevention plate disposed below the contact roller.
3. The resin film manufacturing apparatus according to claim 2, wherein,
the 2 nd upstream side wind guard plate is supported to be able to tilt on a base portion of the forming unit.
4. The resin film manufacturing apparatus according to claim 3, wherein,
the 2 nd upstream wind-guard plate is disposed below the center axis of the contact roller or upstream of the center axis of the contact roller,
the 2 nd upstream side wind-guard plate is capable of falling toward the upstream side,
the rotation direction of the contact roller is a direction in which a lower portion of the contact roller rotates from a downstream side toward an upstream side.
5. The resin film manufacturing apparatus according to claim 2, wherein,
the 2 nd upstream side wind-guard plate includes:
an upstream side body section; and
an upstream-side tip portion disposed in the vicinity of the contact roller with respect to the upstream-side body portion,
the material constituting the upstream-side tip portion is different from the material constituting the upstream-side body portion,
the upstream-side leading end portion is made of a resin material.
6. The resin film manufacturing apparatus according to claim 5, wherein,
the 2 nd upstream wind guard plate has a position adjustment mechanism capable of adjusting a relative position of the upstream tip portion with respect to the upstream main body portion.
7. The resin film manufacturing apparatus according to claim 2, wherein,
the 2 nd upstream wind-guard plate has a convex portion corresponding to the small diameter portion of the contact roller.
8. The resin film manufacturing apparatus according to claim 2, wherein,
the 2 nd upstream wind guard plate has an upstream window portion through which a lower portion of the contact roller and a lower portion of the casting roller can be visually confirmed.
9. The resin film manufacturing apparatus according to claim 1, wherein,
the downstream side roller includes:
a cooling roll which is disposed downstream of the casting roll and cools the resin film; and
a peeling roller that peels the resin film from the cooling roller,
the downstream wind guard plate is disposed below the cooling roller or the peeling roller.
10. The resin film manufacturing apparatus according to claim 9, wherein,
the downstream side wind guard plate is supported by a base portion of the forming unit so as to be able to tilt.
11. The resin film manufacturing apparatus according to claim 9, wherein,
the downstream side wind guard plate includes:
a downstream side main body part; and
a downstream end portion disposed in the vicinity of the downstream roller with respect to the downstream main body portion,
the downstream side leading end portion is formed of a material different from a material of the downstream side main body portion,
the downstream-side leading end portion is made of a resin material.
12. The resin film manufacturing apparatus according to claim 1, wherein,
the downstream wind guard plate has a downstream window portion through which a lower portion of the downstream roller can be visually recognized.
13. A method for producing a resin film, wherein,
a resin film is produced by controlling the generation of the entire air flow in the molding unit by using the production apparatus according to any one of claims 1 to 12.
CN202210511076.5A 2021-05-12 2022-05-11 Apparatus for manufacturing resin film and method for manufacturing resin film Pending CN115339076A (en)

Applications Claiming Priority (2)

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JP2021-080945 2021-05-12
JP2021080945A JP7275195B2 (en) 2021-05-12 2021-05-12 RESIN FILM MANUFACTURING APPARATUS AND RESIN FILM MANUFACTURING METHOD

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* Cited by examiner, † Cited by third party
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JPH08244098A (en) * 1995-03-14 1996-09-24 Sekisui Chem Co Ltd Film forming apparatus
JP2006150806A (en) 2004-11-30 2006-06-15 Jsr Corp Film manufacturing equipment and film manufacturing method using the equipment
JP2007125833A (en) 2005-11-07 2007-05-24 Kaneka Corp Method for forming film and apparatus for film forming
JP5173476B2 (en) 2007-12-05 2013-04-03 富士フイルム株式会社 Thermoplastic resin film production equipment
JP5167039B2 (en) 2008-09-10 2013-03-21 富士フイルム株式会社 Film, film manufacturing method, polarizing plate and liquid crystal display device
JP2016007803A (en) 2014-06-25 2016-01-18 デクセリアルズ株式会社 Method and apparatus for production of resin film

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KR20220154048A (en) 2022-11-21
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TWI812165B (en) 2023-08-11
TW202302317A (en) 2023-01-16

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