Film manufacturing system

Abstract

A film manufacturing system is provided. The film manufacturing system includes an extrusion molding device, a control device, and a width direction extension device that extends a base material being molded in a width direction. The control device is capable of performing a first extension step that extends the base material in the width direction while conveying the base material at a first conveying speed, a speed increase step that increases the conveying speed of the base material from the first conveying speed to a second conveying speed, a track pattern change step that narrows the interval between a first track and a second track on the inlet side of the width direction extension device according to the width of the base material that is narrowed due to the speed increase step, and a second extension step that extends the base material in a flow direction and the width direction while conveying the base material at the second conveying speed.

Description

TECHNICAL FIELD

[0001] The present application relates to a film manufacturing system. BACKGROUND

[0002] Conventionally, a film manufacturing apparatus of a continuous extension method has been known, which includes a melt extrusion film manufacturing apparatus, a flow direction extension apparatus that extends a manufactured resin film in a flow direction, and a width direction extension apparatus that extends the resin film extended in the flow direction in a width direction (for example, refer to Patent Literature 1).

[0003] PRIOR ART DOCUMENT

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2020-023170 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In the manufacturing system described in Patent Literature 1 described above, for example, in a case where the conveyance speed of the base material rises in accordance with an increase in the extension ratio in the flow direction, the width of the base material becomes narrow (so-called neck-in phenomenon). Therefore, the operator needs to change the track pattern of the width direction extension apparatus in a manner that conforms to the width of the base material. In order to change the track pattern, the operator needs to move a plurality of tracks that constitute the track pattern by manual operation, or operate a control panel of the manufacturing system to move the plurality of tracks. Therefore, the changing work of the track pattern takes time and labor, and it is difficult to improve the production efficiency of the film.

[0008] The present application provides a film manufacturing system capable of improving the production efficiency of a film.

[0009] MEANS FOR SOLVING PROBLEMS

[0010] The present application [1] includes a film manufacturing system including: an extrusion molding device that molds a molten resin into a sheet-shaped base material; a width direction extension device that extends the base material being conveyed along a flow direction in a width direction, the width direction extension device having: a first clamp that clamps one end portion of the base material in the width direction; a second clamp that clamps the other end portion of the base material in the width direction; a first track on which the first clamp travels; and a second track on which the second clamp travels; and a control device that controls the extrusion molding device and the width direction extension device, wherein the control device can execute: a first extension step of extending the base material at least in the width direction while conveying the base material at a first conveyance speed; a speed increase step of increasing the conveyance speed of the base material from the first conveyance speed to a second conveyance speed; a track pattern change step of, in a case where the speed increase step is executed, narrowing the interval of the first track and the second track on the inlet side of the width direction extension device in accordance with the width of the base material that narrows due to the increase in the conveyance speed; and a second extension step of extending the base material in the flow direction and the width direction while conveying the base material at the second conveyance speed.

[0011] According to such a structure, it is possible to automatically narrow the interval of the first track and the second track on the inlet side of the width direction extension device in accordance with the width of the base material, without the need for the operator to move the first track and the second track by manual operation or operation on the control panel, as the conveyance speed of the base material increases.

[0012] As a result, in a case where the extension ratio in the flow direction is increased or the conveyance speed of the base material is increased, it is possible to clamp one end portion of the base material in the width direction with the first clamp and the other end portion of the base material in the width direction with the second clamp in the width direction extension device.

[0013] As a result, it is possible to improve the production efficiency of the film.

[0014] The present application [2] includes the film manufacturing system of the above-mentioned [1], wherein a flow direction extension device that extends the substrate in the flow direction is further provided, the width direction extension device extends the substrate after passing through the flow direction extension device in the width direction, the control device increases the extension ratio in the flow direction by increasing the conveyance speed of the substrate from the first conveyance speed to the second conveyance speed in the speed increasing step, and the control device narrows the interval between the first track and the second track on the inlet side of the width direction extension device according to the width of the substrate that is narrowed due to the increase in the extension ratio in the flow direction in the track pattern changing step.

[0015] According to such a structure, in a case where the width of the substrate is narrowed along with the increase in the extension ratio in the flow direction, the interval between the first track and the second track on the inlet side of the width direction extension device can be automatically narrowed in a manner that conforms to the width of the substrate.

[0016] Therefore, in a structure having a flow direction extension device and a width direction extension device, the production efficiency of a film can be improved.

[0017] Effects of the Invention

[0018] According to the film manufacturing system of the present application, the production efficiency of a film can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a cross-sectional view of a film manufactured using the film manufacturing system that is one embodiment of the present application.

[0020] Figure 2 is a schematic configuration view of the film manufacturing system.

[0021] Figure 3 is an explanatory view of Figure 2 the width direction extension device, showing a state when the first extension step is being performed.

[0022] Figure 4 is a flowchart for explaining the control of the film manufacturing system

[0023] Figure 5 is an explanatory view of Figure 2 the width direction extension device, showing a state when the second extension step is being performed. DETAILED DESCRIPTION

[0024] 1. Film manufacturing system

[0025] The film manufacturing system 1 will be described.

[0026] As Figure 1As shown in FIG. 1, the film F has a substrate S and a coating film C. The substrate S has a first surface S1 and a second surface S2 in the thickness direction of the substrate S. The coating film C is disposed on the first surface S1 of the substrate S. The coating film C covers the first surface S1 of the substrate S. The coating film C can also be an easy-adhesion layer. In the case where the coating film C is an easy-adhesion layer, the film F is an easy-adhesion film. The easy-adhesion film is used, for example, for a polarizing plate of an image display device such as a mobile device, a car navigation device, a display for a personal computer, a television, and the like. In detail, the easy-adhesion film is used as a protective film for protecting a polarizing sheet of the polarizing plate. The easy-adhesion film is attached to the polarizing sheet with an adhesive layer. The easy-adhesion film is attached to the polarizing sheet with the easy-adhesion layer.

[0027] As shown in FIG. 1, the film F has a substrate S and a coating film C. The substrate S has a first surface S1 and a second surface S2 in the thickness direction of the substrate S. The coating film C is disposed on the first surface S1 of the substrate S. The coating film C covers the first surface S1 of the substrate S. The coating film C can also be an easy-adhesion layer. In the case where the coating film C is an easy-adhesion layer, the film F is an easy-adhesion film. The easy-adhesion film is used, for example, for a polarizing plate of an image display device such as a mobile device, a car navigation device, a display for a personal computer, a television, and the like. In detail, the easy-adhesion film is used as a protective film for protecting a polarizing sheet of the polarizing plate. The easy-adhesion film is attached to the polarizing sheet with an adhesive layer. The easy-adhesion film is attached to the polarizing sheet with the easy-adhesion layer. Figure 2 As shown in FIG. 1, the film F has a substrate S and a coating film C. The substrate S has a first surface S1 and a second surface S2 in the thickness direction of the substrate S. The coating film C is disposed on the first surface S1 of the substrate S. The coating film C covers the first surface S1 of the substrate S. The coating film C can also be an easy-adhesion layer. In the case where the coating film C is an easy-adhesion layer, the film F is an easy-adhesion film. The easy-adhesion film is used, for example, for a polarizing plate of an image display device such as a mobile device, a car navigation device, a display for a personal computer, a television, and the like. In detail, the easy-adhesion film is used as a protective film for protecting a polarizing sheet of the polarizing plate. The easy-adhesion film is attached to the polarizing sheet with an adhesive layer. The easy-adhesion film is attached to the polarizing sheet with the easy-adhesion layer.

[0028] (1) Extrusion molding device

[0029] The extrusion molding device 2 molds a molten resin obtained by melting a thermoplastic resin into a sheet-shaped substrate S.

[0030] As the thermoplastic resin, for example, an acrylic resin, a polyolefin resin, a cyclic polyolefin resin, a polyester resin (polyethylene terephthalate, etc.), a polycarbonate resin, a polystyrene resin, a polyamide resin, a polyimide resin, an acetate resin (cellulose diacetate, cellulose triacetate, etc.), or the like can be exemplified.

[0031] In the case of manufacturing the easy-adhesion film used as a protective film for a polarizing sheet, as the material of the substrate S, an acrylic resin is preferable.

[0032] In the case of manufacturing the easy-adhesion film used as a protective film for a polarizing sheet, the acrylic resin can also be an acrylic resin having a glutaric anhydride structure, an acrylic resin having a lactone ring structure. Since the acrylic resin having a glutaric anhydride structure and the acrylic resin having a lactone ring structure have high heat resistance, high transparency, and high mechanical strength, they are suitable for manufacturing a polarizing plate having high polarizing degree and excellent durability. The acrylic resin having a glutaric anhydride structure is described in Japanese Patent Application Publication No. 2006-283013, Japanese Patent Application Publication No. 2006-335902, and Japanese Patent Application Publication No. 2006-274118. The acrylic resin having a lactone ring structure is described in Japanese Patent Application Publication No. 2000-230016, Japanese Patent Application Publication No. 2001-151814, Japanese Patent Application Publication No. 2002-120326, Japanese Patent Application Publication No. 2002-254544, and Japanese Patent Application Publication No. 2005-146084.

[0033] In addition, the substrate S can contain, in addition to the acrylic resin, another thermoplastic resin other than the acrylic resin. By containing another thermoplastic resin, the birefringence of the acrylic resin can be offset, and an easily adhesive film having excellent optical isotropy can be obtained. In addition, the mechanical strength of the easily adhesive film can be improved.

[0034] In addition, the substrate S can contain an antioxidant, a stabilizer, a reinforcing material, an ultraviolet absorber, a flame retardant, an antistatic agent, a colorant, a filler, a plasticizer, a lubricant, a filler, and the like.

[0035] (2) Flow direction extension device

[0036] The flow direction extension device 4A extends the substrate S in the flow direction MD after heating the substrate S being conveyed in the flow direction MD.

[0037] (3) Coating device

[0038] The coating device 3 applies a coating liquid to the first surface S1 of the substrate S. As the coating device, for example, a bar coater, a gravure coater, a kiss coater, and the like can be exemplified. In addition, before the first surface S1 of the substrate S is applied with the coating liquid, the first surface S1 of the substrate S can be subjected to surface treatment such as corona treatment, plasma treatment, and the like.

[0039] In the case of manufacturing an easily adhesive film, the coating liquid is an easily adhesive composition for forming an easily adhesive layer.

[0040] The easily adhesive layer contains an adhesive resin and a fine particle.

[0041] As the adhesive resin, for example, a thermosetting resin such as a urethane resin, an epoxy resin, and the like, and a thermoplastic resin such as an acrylic resin, a polyester resin, and the like can be exemplified. In the case where the easily adhesive film is used as a protective film of a polarizing plate, the adhesive resin is preferably a thermosetting resin. A plurality of adhesive resins can be used in combination.

[0042] As the fine particle, for example, an oxide such as silica, titania, alumina, zirconia, and the like, a carbonate such as calcium carbonate, and the like, a silicate such as calcium silicate, aluminum silicate, magnesium silicate, and the like, a silicate mineral such as talc, kaolin, and the like, a phosphate such as calcium phosphate, and the like can be exemplified. In the case where the easily adhesive film is used as a protective film of a polarizing plate, the fine particle is preferably an oxide, and more preferably silica. A plurality of fine particles can be used in combination.

[0043] The coating liquid (easily adhesive composition) contains a resin component, a dispersion medium, and the fine particle described above.

[0044] The resin component is used to form a coating (easy-to-bond layer) of the aforementioned adhesive resin. When the adhesive resin is a polyurethane resin, waterborne polyurethane resins can be cited as examples of resin components. Examples of waterborne polyurethane resins include, for instance, non-reactive waterborne polyurethane resins that are emulsions of polyurethane resins, and reactive waterborne polyurethane resins that are emulsions of polyurethane resins that utilize blocking agents to protect the isocyanate groups. When the adhesive resin is a polyurethane resin, the coating liquid may also contain a polyurethane curing catalyst (such as triethylamine) and isocyanate monomers.

[0045] Examples of dispersion media include water, alcohols such as methanol and ethanol, and ketones such as acetone and methyl ethyl ketone.

[0046] (4) Width direction extension device

[0047] The width-direction extending device 4B dries the coating liquid applied to the substrate S. Thus, the coating liquid becomes the aforementioned film C. Furthermore, after heating the substrate S to which the film C is formed, the width-direction extending device 4B extends the substrate S in the width direction TD. The width direction TD is orthogonal to the flow direction MD. By extending the substrate S to which the film C is formed in the width direction TD, the aforementioned film F is obtained.

[0048] In detail, such as Figure 3 As shown, the width-direction extension device 4B has an inlet 41, an outlet 42, a preheating zone A1, an extension zone A2, and a cooling zone A3. The preheating zone A1 is located in the flow direction MD, between the inlet 41 and the extension zone A2. The preheating zone A1 is used to heat the substrate S. The extension zone A2 is located in the flow direction MD, between the preheating zone A1 and the cooling zone A3. The extension zone A2 is used to extend the substrate S in the width direction TD. The cooling zone A3 is located in the flow direction MD, between the extension zone A2 and the outlet 42. The cooling zone A3 is used to cool the substrate S.

[0049] The width-direction extension device 4B also has multiple first tracks 43A to 43I, multiple second tracks 44A to 44I, multiple first clamps 45, and multiple second clamps 46.

[0050] The first tracks 43A to 43I are arranged in the width direction extending device 4B in the order of the first tracks 43A to 43I from the inlet 41 to the outlet 42. The first track pattern P1 is formed by arranging the first tracks 43A to 43I. In detail, the first tracks 43A to 43D in the preheating region Al are arranged along the flow direction MD. The first tracks 43E to 43G in the extending region A2 are arranged along a direction inclined with respect to the flow direction MD. The first tracks 43E to 43G are away from the second tracks 44E to 44G as going to the downstream side of the flow direction MD. The first tracks 43H, 43I in the cooling region A3 are arranged along the flow direction MD.

[0051] The second tracks 44A to 44I are arranged in the width direction TD apart from the first tracks 43A to 43I. The second tracks 44A to 44I are arranged in the width direction extending device 4B in the order of the second tracks 44A to 44I from the inlet 41 to the outlet 42. The second track pattern P2 is formed by arranging the second tracks 44A to 44I. In detail, the second tracks 44A to 44D in the preheating region Al are arranged along the flow direction MD. The second tracks 44A to 44D are apart from the first tracks 43A to 43D in the width direction TD. The second tracks 44E to 44G in the extending region A2 are arranged along a direction inclined with respect to the flow direction MD. The second tracks 44E to 44G are away from the first tracks 43E to 43G as going to the downstream side of the flow direction MD. The first track 43F is apart from the second track 44F in the width direction TD by a wider interval than the first track 43E is apart from the second track 44E in the width direction TD. The first track 43G is apart from the second track 44G in the width direction TD by a wider interval than the first track 43F is apart from the second track 44F in the width direction TD. The second tracks 44H, 44I in the cooling region A3 are arranged along the flow direction MD. The second tracks 44H, 44I are apart from the first tracks 43H, 43I in the width direction TD.

[0052] The plurality of first clamps 45 travel on the first track pattern P1. In other words, the plurality of first clamps 45 travel on the first tracks 43A to 43I. The plurality of first clamps 45 respectively hold one end portion E1 of the substrate S in the width direction TD on the way from the inlet 41 to the outlet 42.

[0053] The plurality of second clamps 46 travel on the second track pattern P2. In other words, the plurality of second clamps 46 travel on the second tracks 44A to 44I. The plurality of second clamps 46 respectively hold the other end portion E2 of the substrate S in the width direction TD on the way from the inlet 41 to the outlet 42.

[0054] (5) Slit processing device

[0055] like Figure 2 As shown, the slit cutting device 5 cuts the membrane F to a specified width.

[0056] (6) Knurling processing device

[0057] The knurling device 6 forms embossing at both ends of the film F, which has been cut to a specified width, in the width direction. Embossing can be achieved using a laser. Alternatively, a heated embossing roller can be used to form the embossing.

[0058] (7) Winding device

[0059] The winding device 7 winds up the embossed film F. By completing the winding, a roll of film F can be obtained.

[0060] 2. Details of the membrane manufacturing system

[0061] The membrane manufacturing system 1 also includes a control device 11.

[0062] Control device 11 controls the operation of the film manufacturing system 1. Specifically, control device 11 is electrically connected to the extrusion molding device 2, the flow direction extension device 4A, the coating device 3, the width direction extension device 4B, the slit cutting device 5, the knurling device 6, and the winding device 7. Control device 11 controls the extrusion molding device 2, the flow direction extension device 4A, the coating device 3, the width direction extension device 4B, the slit cutting device 5, the knurling device 6, and the winding device 7. Figure 4 As shown, the control device 11 can execute the first extension step (S1), the speed increase step (S3), the track mode change step (S4), and the second extension step (S5).

[0063] (1) First extension step

[0064] In the first extension step (S1), the control device 11 conveys the substrate S at a first conveying speed while using the width direction extension device 4B to extend the substrate S in the width direction TD after passing through the flow direction extension device 4A. Alternatively, in the first extension step (S1), the substrate S can be extended in the flow direction MD without using the flow direction extension device 4A.

[0065] In the first extension step (S1), the distance between the first track 43A and the second track 44A in the width direction TD is D1. In addition, the distance between the first track 43B and the second track 44B in the width direction TD, the distance between the first track 43C and the second track 44C in the width direction TD, and the distance between the first track 43D and the second track 44D in the width direction TD are also D1.

[0066] Furthermore, the distance between the first track 43I and the second track 44I in the width direction TD is D2. The distance D2 is wider than the distance D1. In addition, the distance between the first track 43H and the second track 44H in the width direction TD is also D2.

[0067] (2) Steps to increase speed

[0068] like Figure 4 As shown, when the operator operates the control panel (not shown) to increase the elongation ratio of the membrane F (S2: "Yes"), the control device 11 executes the speed increase step (S3).

[0069] In the speed increase step (S3), the control device 11 controls the flow direction extension device 4A to increase the extension ratio in the flow direction MD by increasing the conveying speed of the substrate S from the first conveying speed to the second conveying speed. As a result, the width of the substrate S narrows due to the increase in the extension ratio in the flow direction MD (width reduction phenomenon).

[0070] Therefore, as Figure 5 As shown, the width W2 of the substrate S entering the inlet 41 of the width direction extension device 4B becomes narrower than the width W1 of the substrate S entering the inlet 41 of the width direction extension device 4B in the first extension step (S1) (refer to...). Figure 3 ).

[0071] (3) Track mode change steps

[0072] Next, as Figure 4 As shown, when the speed increase step (S3) is executed, the control device 11 executes the track mode change step (S4).

[0073] In the orbital mode change step (S4), such as Figure 5 As shown, the control device 11 narrows the gap between the first track 43A and the second track 44A on the inlet 41 side of the width-direction extending device 4B based on the width W2 of the substrate S, which narrows due to the speed increase step (S3). The control device 11 moves the first track 43A and the second track 44A in the width direction TD to narrow the gap between them. The shape of the first track pattern P1 and the second track pattern P2 is changed through the track pattern changing step (S4).

[0074] After performing the track mode change step (S4), the spacing between the first track 43A and the second track 44A in the width direction TD is D3. Spacing D3 is narrower than spacing D1 (refer to...). Figure 3Furthermore, the spacing between the first track 43B and the second track 44B in the width direction TD, the spacing between the first track 43C and the second track 44C in the width direction TD, and the spacing between the first track 43D and the second track 44D in the width direction TD are the same as the spacing between the first track 43A and the second track 44A in the width direction TD, which is also D3.

[0075] In addition, the control device 11 moves each of the first tracks 43E to 43G and each of the second tracks 44E to 44G in the width direction TD relative to the interval D3, thereby narrowing the interval between the first track 43E and the second track 44E, the interval between the first track 43F and the second track 44F, and the interval between the first track 43G and the second track 44G.

[0076] Furthermore, in this embodiment, the control device 11 does not move the first tracks 43H, 43I and the second tracks 44H, 44I.

[0077] The movement amounts of the first tracks 43A-43G and the second tracks 44A-44G are predetermined through experiments or calculations based on the change in the width of the substrate S during the speed increase step (S3). In this embodiment, the control device 11 stores the movement amounts of the first tracks 43A-43G and the second tracks 44A-44G when the first conveying speed is changed to the second conveying speed as set values. The control device 11 moves the first tracks 43A-43G and the second tracks 44A-44G based on these set values.

[0078] Therefore, without the operator having to manually move the first tracks 43A-43G and the second tracks 44A-44G through the control panel, the first track mode P1 and the second track mode P2 can be automatically changed in accordance with the width W2 of the substrate S as the extension ratio in the flow direction MD increases.

[0079] Therefore, even when the elongation ratio in the flow direction MD is increased, it is possible to use multiple first clamps 45 to clamp one end E1 in the width direction TD of the substrate S, and to use multiple second clamps 46 to clamp the other end E2 in the width direction TD of the substrate S.

[0080] The result is that it can improve the production efficiency of membrane F.

[0081] (4) Second extension step

[0082] If the track mode change step (S4) is completed, the control device 11 executes the second extension step (S5).

[0083] In the second extension step (S5), the control device 11 causes the substrate S to extend in the flow direction MD at the extension ratio set in the speed increase step (S3) in the flow direction extension device 4A, and in the width direction extension device 4B, while the substrate S is conveyed at the second conveying speed, the substrate S is extended in the width direction TD using the first track mode P1 and the second track mode P2 changed by the track mode change step (S4).

[0084] In this embodiment, the extension ratio in the second extension step (S5) is higher than the extension ratio in the first extension step (S1) in both the flow direction MD and the width direction TD.

[0085] 3. Variations

[0086] (1) The control device 11 can also calculate the amount of movement of the first track 43A to 43G and the second track 44A to 44G based on the amount of change in conveying speed caused by the increase of the extension ratio along the flow direction MD, and move the first track 43A to 43G and the second track 44A to 44G based on the calculation results.

[0087] In addition, the control device 11 can also measure the width W2 of the substrate S after the speed increase step (S3), and move the first track 43A to 43G and the second track 44A to 44G based on the measurement result.

[0088] (2) The increase in the conveying speed of the substrate S in the speed increase step (S3) is not limited to the increase in conveying speed used to increase the elongation ratio in the flow direction MD. It can also be the increase in conveying speed used to increase the production speed of the manufacturing system 1 for the membrane F.

[0089] (3) The manufacturing system 1 of the membrane F may not have the flow direction extension device 4A. Alternatively, the width direction extension device 4B can be used to extend the substrate S coated with the coating liquid in both the flow direction MD and the width direction TD (simultaneous extension in both directions).

[0090] (4) The manufacturing system 1 of the membrane F may also have a masking film feeding device for feeding out the masking film and a bonding device for bonding the fed masking film to the membrane F, instead of the knurling processing device 6.

[0091] Furthermore, the above-described invention is provided as an illustrative embodiment of the present invention, but it is merely an example and should not be interpreted in a limiting manner. Modifications of the invention that will be apparent to those skilled in the art are also included within the scope of the claims.

[0092] Industrial availability

[0093] The membrane manufacturing system and method of the present invention are used in the manufacture of membranes such as easy-to-adhere membranes.

[0094] Explanation of reference numerals in the attached figures

[0095] 1: Membrane manufacturing system; 2: Extrusion molding device; 4B: Width direction extension device; 11: Control device; 43A: First track; 44A: Second track; 45: First clamp; 46: Second clamp; F: Membrane; S: Substrate; S1: First extension step; S3: Speed ​​increase step; S4: Track mode change step; S5: Second extension step.

Claims

1. A membrane manufacturing system, comprising: An extrusion molding device that shapes molten resin into sheet-like substrates; A flow direction extending device that extends the substrate being conveyed along the flow direction in the flow direction; A width-direction extending device that extends the substrate conveyed along the flow direction after passing through the flow direction extending device in the width direction, the width-direction extending device having: a first clamp that clamps one end of the substrate in the width direction; a second clamp that clamps the other end of the substrate in the width direction; a first track on which the first clamp travels; and a second track on which the second clamp travels. as well as A control device that controls the extrusion molding apparatus, the flow direction extension device, and the width direction extension device. The control device is capable of controlling the execution of the following steps: In the first extension step, the substrate is conveyed at a first conveying speed while extending the substrate at least in the width direction. In the speed increase step, the flow direction extension device is controlled to increase the conveying speed of the substrate from the first conveying speed to the second conveying speed. In the track mode change step, after the speed increase step has been performed, the spacing between the first track and the second track on the inlet side of the width-direction extension device is narrowed based on the width of the substrate, which narrows due to the increase in conveying speed; and The second extension step involves conveying the substrate at the second conveying speed while extending the substrate in the flow direction and the width direction.

2. The membrane manufacturing system according to claim 1, wherein, During the speed increase step, the control device increases the elongation ratio in the flow direction by increasing the conveying speed of the substrate from a first conveying speed to a second conveying speed. In the track mode change step, the control device narrows the gap between the first track and the second track on the inlet side of the width direction extension device according to the width of the substrate, which narrows due to the increase in the extension ratio in the flow direction.

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