JP2015101001A - Resin sheet manufacturing device, resin sheet manufacturing method, and fuel tank manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin sheet manufacturing device that can improve the yield of a resin molding.SOLUTION: A resin sheet manufacturing device 20 comprises: a die 22 having an extrusion port 24 for extruding a molten resin P into a sheet shape; a lip 26 as an example of a first adjustment member that is installed in the die 22 and moves in a direction orthogonal to the extrusion direction of the molten resin P to adjust the opening amount A in the short-side direction of the extrusion port 24; and a deckle 34 as an example of a second adjustment member that is installed downstream of the lip 26 of the die 22 in the extrusion direction and moves in a direction orthogonal to the extrusion direction and the movement direction of the lip 26 to adjust the opening amount B in the long-side direction of extrusion port 24.

Description

  The present invention relates to a resin sheet manufacturing apparatus, a resin sheet manufacturing method, and a fuel tank manufacturing method.

  In patent document 1, the extruder which extrudes molten resin in a sheet form is disclosed. In this extruder, the lip (segment) provided on the die is slid in a direction perpendicular to the extrusion direction of the molten resin, thereby adjusting the opening of the extrusion port of the die and the thickness of the molten resin extruded into a sheet shape. Is adjusted.

Special table 2010-527819

  By the way, in the extruder of patent document 1, although the thickness of the molten resin extruded to a sheet form can be adjusted, it cannot adjust about a width | variety. For this reason, the yield of the resin product (resin molded product) manufactured with the molten resin extruded in the sheet form may deteriorate, and there is room for improvement.

  In consideration of the above facts, the present invention provides a resin sheet manufacturing apparatus capable of improving the yield of resin molded products, a resin sheet manufacturing method capable of improving the yield of resin molded products, and a resin manufactured by the resin sheet manufacturing method. A method of manufacturing a fuel tank using a seat is obtained.

  The apparatus for producing a resin sheet according to claim 1 is a die having an extrusion port for extruding molten resin into a sheet shape, and is provided in the die and moves in a direction perpendicular to the extrusion direction of the molten resin. A first adjusting member that adjusts an opening amount of the extrusion port in the short direction, and provided on the downstream side of the extruding direction with respect to the first adjusting member of the die, and in a direction orthogonal to the extruding direction and A second adjusting member that moves in a direction intersecting the moving direction of the first adjusting member and adjusts the opening amount of the extrusion port in the longitudinal direction;

  In the resin sheet manufacturing apparatus according to the first aspect of the present invention, the opening amount in the short side direction and the long side direction of the extrusion port is adjusted by the first adjustment member and the second adjustment member, respectively. And molten resin is extruded in a sheet form from the extrusion port in which the opening amount in the short side direction and the long side direction is adjusted. That is, a sheet-like molten resin (a molten resin sheet) is manufactured.

  Here, in the manufacturing apparatus described above, the opening amount in the longitudinal direction of the extrusion port is adjusted by the second adjustment member after the opening amount in the short direction of the extrusion port is adjusted by the first adjustment member. 2 The width of the molten resin extruded into a sheet, as compared with a manufacturing apparatus that does not include an adjustment member, or a manufacturing apparatus that adjusts the opening amount in the short direction of the extrusion port after adjusting the opening amount in the longitudinal direction of the extrusion port. Can be made closer to a predetermined value (the width of the resin sheet required for the production (molding) of the resin molded product). Thereby, the yield of the resin molded product manufactured using the molten resin (molten resin sheet) extruded into a sheet shape can be improved.

  A resin sheet manufacturing apparatus according to a second aspect of the present invention is the resin sheet manufacturing apparatus according to the first aspect, wherein the second adjustment member is on the surface of the die on which the extrusion port is formed. It is arranged with a gap and moves along the surface.

  In the resin sheet manufacturing apparatus according to the second aspect of the invention, the second adjustment member is disposed with a gap with respect to the surface of the die and moved along the surface of the die. Compared to the member that slides along the surface of the die, even if the second adjustment member expands due to the heat of the molten resin, the movement performance of the second adjustment member can be ensured. Thereby, the yield of a resin molded product can be secured stably.

  A resin sheet manufacturing apparatus according to a third aspect of the present invention is the resin sheet manufacturing apparatus according to the first or second aspect, further comprising a cooling means for cooling the second adjusting member.

  In the resin sheet manufacturing apparatus according to the third aspect of the invention, the molten resin around the second adjustment member is cooled by the second adjustment member cooled by the cooling means. As a result, the viscosity of the molten resin around the second adjustment member increases, and leakage of the molten resin from the gap between the die and the second adjustment member is suppressed.

  A resin sheet manufacturing apparatus according to a fourth aspect of the present invention is the resin sheet manufacturing apparatus according to the third aspect, wherein the cooling means includes a flow path formed inside the second adjustment member, and And a delivery device for delivering a cooling medium to the flow path.

  In the resin sheet manufacturing apparatus according to the fourth aspect of the present invention, since the cooling medium is sent out to the flow path formed inside the second adjustment member using the delivery device, the second adjustment member is efficiently cooled. Can do. This effectively suppresses the molten resin from leaking from the gap between the die and the second adjustment member.

  The manufacturing method of the resin sheet which concerns on invention of Claim 5 is a supply process which supplies molten resin to the die | dye which has an extrusion port for extruding molten resin in a sheet form, and the opening amount of the transversal direction of the said extrusion port Adjusting the thickness of the molten resin extruded into a sheet shape and adjusting the opening amount in the longitudinal direction of the extrusion port to adjust the width of the molten resin whose thickness has been adjusted. A width adjusting step.

  In the resin sheet manufacturing method according to the fifth aspect, the thickness is adjusted in the thickness adjusting step, and the molten resin whose width is adjusted in the width adjusting step is extruded into a sheet shape. That is, a sheet-like molten resin (a molten resin sheet) is manufactured.

  Here, in the above manufacturing method, after adjusting the thickness of the molten resin extruded into a sheet shape, the width of the molten resin is adjusted. For example, the manufacturing method does not adjust the width of the molten resin extruded into a sheet shape. Compared with the manufacturing method of adjusting the thickness of the molten resin after adjusting the width of the molten resin extruded into a sheet shape, the width of the molten resin extruded into a sheet shape is a predetermined value (manufacturing (molding) of a resin molded product) The width of the resin sheet required for the Thereby, the yield of the resin molded product manufactured using the molten resin (molten resin sheet) extruded into a sheet shape can be improved.

  The method for producing a resin sheet according to claim 6 is the method for producing a resin sheet according to claim 5, wherein in the width adjusting step, an adjustment member for adjusting an opening amount of the extrusion port in the longitudinal direction is provided. While cooling, the width of the molten resin extruded into a sheet is adjusted.

  In the resin sheet manufacturing method according to the invention of claim 6, in the width adjusting step, the width of the molten resin whose thickness is adjusted while adjusting the adjusting member is adjusted. 2 The molten resin around the adjusting member is cooled. Thereby, the viscosity of the molten resin around the second adjusting member is increased, and the molten resin is prevented from leaking from the gap between the die and the adjusting member.

  According to a seventh aspect of the present invention, there is provided a fuel tank manufacturing method that manufactures a tank body of a fuel tank using the resin sheet manufactured by the resin sheet manufacturing method according to the fifth or sixth aspect.

  In the fuel tank manufacturing method according to the seventh aspect of the invention, the tank body of the fuel tank is manufactured using the molten resin sheet manufactured by the resin sheet manufacturing method according to the fifth or sixth aspect. Is done. Here, the yield of the fuel tank manufactured by the above manufacturing method is improved.

  The apparatus for producing a resin sheet according to the first aspect of the present invention has an excellent effect that the yield of resin molded products can be improved.

  The apparatus for producing a resin sheet according to the second aspect of the present invention has an excellent effect that the yield of the resin molded product can be secured stably.

  The apparatus for producing a resin sheet according to the third aspect of the present invention has an excellent effect that leakage of molten resin during production can be suppressed.

  The apparatus for producing a resin sheet according to the present invention described in claim 4 has an excellent effect that the leakage of the molten resin during production can be effectively suppressed.

  The method for producing a resin sheet according to the fifth aspect of the present invention has an excellent effect that the yield of the resin molded product can be improved.

  The method for producing a resin sheet according to the present invention described in claim 6 has an excellent effect that leakage of the molten resin during production can be suppressed.

  The method for manufacturing a fuel tank according to the seventh aspect of the present invention has an excellent effect that the yield of the fuel tank can be improved.

It is the front view which looked at the manufacturing apparatus of the resin sheet which concerns on one Embodiment of this invention from the front. It is the arrow 2-2 sectional view taken on the line of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 in FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. It is sectional drawing of the fuel tank manufactured with the manufacturing method of the fuel tank which concerns on one Embodiment of this invention. It is sectional drawing of a shaping | molding die which shows the state which set the resin sheet to the shaping | molding die for shape | molding the fuel tank of FIG.

  Hereinafter, an embodiment of a resin sheet manufacturing apparatus according to the present invention will be described. FIG. 1 shows a resin sheet manufacturing apparatus 20 of the present embodiment (hereinafter simply referred to as “manufacturing apparatus 20”). Note that an arrow UP in the drawing indicates the upper side of the manufacturing apparatus 20.

  The manufacturing apparatus 20 of the present embodiment is an apparatus that manufactures a resin sheet (resin material) that becomes a tank body 52 of a fuel tank 50 (see FIG. 6) mounted on a vehicle. The present invention is not limited to this configuration. For example, you may manufacture the resin sheet used as another resin molded product used for a vehicle with the manufacturing apparatus 20. FIG. Moreover, the use of the resin sheet manufactured with the manufacturing apparatus 20 is not restricted to a vehicle.

  As shown in FIGS. 1 and 2, the manufacturing apparatus 20 includes a metal die 22 having an extrusion port 24 (see FIG. 5) for extruding the molten resin P kneaded in the upstream process into a sheet shape. Yes. Inside the die 22, a molten resin P supply channel 23 (see FIG. 2) communicating with the extrusion port 24 is formed. In FIG. 5, illustration of the molten resin P is omitted.

  As shown in FIGS. 2 and 3, the molten resin P is extruded from the extrusion port 24 into a sheet shape. In the present embodiment, the extrusion port 24 faces downward. For this reason, the molten resin P is extruded downward. That is, in this embodiment, the extrusion direction of the molten resin P (the direction indicated by the arrow E in FIG. 1) is downward.

  As shown in FIG. 5, the extrusion port 24 is substantially rectangular when viewed from the front (below). One side of the extrusion port 24 in the short direction is constituted by one end 26A of a lip 26 described later, and the other side in the short direction is constituted by an edge portion 22B of the surface 22A of the die 22 (the lower surface in the present embodiment). It is configured. Further, both sides in the longitudinal direction of the extrusion port 24 are constituted by one end 34A of a deckle 34 described later.

  The molten resin P extruded from the manufacturing apparatus 20 of this embodiment is a multilayered molten resin. Specifically, the multilayered molten resin P includes a resin layer and a barrier layer having a lower fuel permeability than that of the resin layer (a fuel is difficult to permeate). For example, high density polyethylene (HDPE) is used as the resin layer, and ethylene vinyl alcohol (EVOH) is used as the barrier layer as an example. In addition, this invention is not limited to the said structure, For example, the molten resin P may be a single resin layer.

  As shown in FIGS. 2 and 4, the manufacturing apparatus 20 is provided on the die 22 and moves in a direction perpendicular to the extrusion direction of the molten resin P (in this embodiment, the direction indicated by the arrow X). A metal lip 26 is provided as an example of a first adjustment member that adjusts the opening amount A of the extrusion port 24 in the short direction (the same direction as the X direction in the present embodiment). In FIG. 4, illustration of the molten resin P is omitted.

  Specifically, the lip 26 is inserted into a concave portion 28 formed on the surface 22A (the lower surface in FIG. 2) of the die 22, and the holder 30 attached to the die 22 is used in the short direction of the extrusion port 24. It is held so that it can move along.

  Further, the lip 26 is configured to be able to move in the short direction of the extrusion port 24 by receiving a driving force from the actuator 32. In this embodiment, a servo motor is used as an example of the actuator 32, and a driving force (rotational force) from the servo motor is transmitted to the lip 26 via a force conversion mechanism (for example, a ball screw jack). The lip 26 moves in the short direction of the extrusion port 24. In the present embodiment, the actuator 32 is fixed to the die 22 using a bracket (not shown). However, the present invention is not limited to this configuration, and the actuator 32 is attached to the frame (not shown) of the manufacturing apparatus 20. You may fix using a bracket.

  Further, since one side 26A of the lip 26 is formed on one side in the short direction of the extrusion port 24, the opening amount A of the extrusion port 24 is adjusted by moving the lip 26 in the short direction of the extrusion port 24. be able to.

  As shown in FIGS. 1 and 3, the manufacturing apparatus 20 is provided downstream of the lip 26 of the die 22 in the extrusion direction, and is perpendicular to the extrusion direction and the moving direction of the lip 26 (X direction). It moves to the direction which cross | intersects (in this embodiment, the direction shown by the arrow Y which is an orthogonal direction), and adjusts the opening amount B of the longitudinal direction (the same direction as Y direction in this embodiment) of the extrusion port 24. 2 A metal deckle 34 is provided as an example of the adjusting member.

  Specifically, the deckle 34 has a plate shape and is disposed with a gap G between one plate surface (in this embodiment, the upper surface) 34 </ b> B and the surface 22 </ b> A of the die 22. Further, the deckle 34 moves along the surface 22 </ b> A of the die 22. In this embodiment, the surface 22A of the die 22 is a plane orthogonal to the extrusion direction.

  The deckle 34 is held movably along the longitudinal direction of the extrusion port 24 by holders 36 and 37 attached to the die 22. The deckle 34 is configured to be movable in the longitudinal direction of the extrusion port 24 by receiving a driving force from the actuator 38. In the present embodiment, a servo motor is used as an example of the actuator 38, and driving force (rotational force) from the servo motor is transmitted to the deckle 34 via a force conversion mechanism (for example, a ball screw jack). The deckle 34 moves in the longitudinal direction of the extrusion port 24. In this embodiment, the actuator 38 is fixed to the die 22 using a bracket (not shown). However, the present invention is not limited to this configuration, and the actuator 38 is attached to the frame (not shown) of the manufacturing apparatus 20. You may fix using a bracket.

  As shown in FIG. 5, the manufacturing apparatus 20 includes a cooling device 40 as an example of a cooling unit for cooling the deckle 34. The cooling device 40 includes a flow path 42 formed inside the deckle 34 and a pump 44 as an example of a delivery device for sending a cooling medium (cooling water in the present embodiment) to the flow path 42. It is configured.

  One end and the other end of the flow path 42 are opened to the other end 34 </ b> C of the deckle 34. Moreover, the flow path 42 is substantially U-shaped in a plan view between one end and the other end. In the present embodiment, the portion between the one end and the other end of the flow path 42 is configured to extend in a substantially U shape in plan view. However, if the inside of the deckle 34 can be efficiently cooled with cooling water, the flow path 42 is provided. There are no particular restrictions on the path and cross-sectional shape.

  Moreover, in this embodiment, although the flow path 42 is formed in the center part of the thickness direction of the deckle 34, this invention is not limited to this structure. For example, the flow path 42 may be formed close to one plate surface 34 </ b> B side of the deckle 34. Thereby, since one plate surface 34B side of the deckle 34 which is the side in contact with the molten resin P is cooled, the molten resin P around the deckle 34 can be efficiently cooled. A supply port and a recovery port for the cooling water of the pump 44 are connected to one end and the other end of the flow path 42 through a pipe, respectively. As the pump 44 operates, the cooling water in the flow path 42 is circulated.

  Next, the manufacturing method of the resin sheet which concerns on this invention is demonstrated. In addition, in the manufacturing method of the resin sheet of this embodiment, the resin sheet is manufactured using the manufacturing apparatus 20.

(Supply process)
First, the molten resin P kneaded in the upstream process is supplied to the die 22 (see FIGS. 2 and 3).

(Thickness adjustment process)
Next, as shown in FIGS. 2 and 4, the lip 26 is moved to adjust the opening amount A in the short direction of the extrusion port 24. Thereby, the thickness T of the molten resin P extruded in the sheet form from the extrusion port 24 is adjusted.

(Width adjustment process)
Then, as shown in FIGS. 3 and 5, the deckle 34 is moved to adjust the opening amount B in the longitudinal direction of the extrusion port 24. Thereby, the width W of the molten resin P whose thickness T is adjusted is adjusted. In the width adjusting step, the width W of the molten resin P whose thickness T is adjusted is adjusted while cooling the deckle 34 by the cooling device 40.

  Thus, the thickness T is adjusted in the thickness adjusting step, and the molten resin P whose width W is adjusted in the width adjusting step is extruded into a sheet shape. That is, a sheet-like molten resin (a molten resin sheet) is manufactured.

  Here, in the manufacturing method of the resin sheet of the present embodiment, after adjusting the thickness T of the molten resin P extruded into a sheet shape, the width W of the molten resin P is adjusted. Compared to the manufacturing method of adjusting the thickness T of the molten resin P after adjusting the width of the molten resin P, the width W of the molten resin extruded into a sheet shape is required for the predetermined value (manufacturing (molding) of the resin molded product). The width of the resin sheet to be made. Thereby, the yield of the resin molded product (in this embodiment, the tank main body 52) manufactured using the molten resin (molten resin sheet) extruded into a sheet shape can be improved.

  Further, in the width adjusting step, the width W of the molten resin whose thickness T has been adjusted is adjusted while cooling the deckle 34, so that the molten resin P around the deckle 34 is cooled by the cooled deckle 34. As a result, the viscosity of the molten resin P around the deckle 34 is increased, and leakage of the molten resin P from the gap between the die 22 and the deckle 34 is suppressed. Further, since the periphery of the deckle 34 is located at the end portion PE in the width direction of the molten resin P extruded in a sheet shape, the rigidity of the end portion PE becomes higher than the central portion of the molten resin P by cooling. For this reason, even if the difference between the wide width portion and the narrow width portion in the molten resin P extruded into a sheet shape becomes large, the sheet shape of the molten resin P can be maintained, so that problems do not easily occur.

  Next, a method for manufacturing a fuel tank according to the present invention will be described. In the fuel tank manufacturing method of the present embodiment, as shown in FIG. 7, the tank body 52 of the fuel tank 50 (see FIG. 6) using the molten resin sheet manufactured by the resin sheet manufacturing method. Manufacturing.

First, the molten resin sheet WP <b> 1 that becomes the tank body upper portion 54 (see FIG. 6) of the tank body 52 is manufactured by the resin sheet manufacturing method using the manufacturing apparatus 20.
Next, the molten resin sheet WP1 is conveyed to a fuel tank molding device (not shown) and processed into a predetermined length.
Then, the molten resin sheet WP1 is set on a molding upper die 56 (see FIG. 7) for molding the tank body upper part 54 (see FIG. 6), and the shape of the tank body upper part 54 is shaped by vacuum molding. After that, fix the built-in parts.

On the other hand, the resin sheet WP2 in a molten state that becomes the tank body lower portion 58 (see FIG. 6) of the tank body 52 is manufactured by the resin sheet manufacturing method using the manufacturing apparatus 20.
Next, the molten resin sheet WP2 is conveyed to a fuel tank molding device (not shown) and processed into a predetermined length.
Then, the molten resin sheet WP2 was set in a molding lower mold 60 (see FIG. 7) for molding the tank body lower part 58 (see FIG. 6), and the shape of the tank body lower part 58 was shaped by vacuum molding. After that, fix the built-in parts.

  Next, the molding upper die 56 and the molding lower die 60 are closed, a portion corresponding to the outer peripheral edge portion 54A of the resin sheet WP1 serving as the tank main body upper portion 54, and an outer peripheral edge portion of the resin sheet WP2 serving as the tank main body lower portion 58. The portion corresponding to 58A is overlapped, and the molten resin is cooled and solidified. Thereafter, the molding upper die 56 and the molding lower die 60 are opened, and the tank main body 52 is released, whereby the production of the hollow tank main body 52 is completed.

  Thereafter, the fuel tank 50 is completed by attaching the fuel tank constituent members to the tank body 52. In addition, the manufacturing method of the fuel tank of this invention is not limited to the said structure. For example, for forming the tank main body upper part 54 and the tank main body lower part 58, compressed air molding or press molding may be used.

Next, the effect of the manufacturing apparatus 20 of this embodiment is demonstrated.
In the manufacturing apparatus 20, since the opening amount B of the extrusion port 24 is adjusted by the deckle 34 after the opening amount A of the extrusion port 24 is adjusted by the lip 26, the width W of the molten resin P extruded into a sheet shape is set to a predetermined value. The value (the width of the resin sheet required for the production (molding) of the resin molded product) can be approached. Thereby, the yield of the resin molded product (in this embodiment, the tank main body 52) manufactured using the molten resin (molten resin sheet) extruded into a sheet shape can be improved.

  Moreover, in the manufacturing apparatus 20, since the deckle 34 is disposed with a gap G with respect to the surface 22A of the die 22 and moved along the surface 22A, even if the deckle 34 is thermally expanded by the heat of the molten resin P. Since the deckle 34 can be prevented from coming into contact with the surface 22A, smooth movement (movement performance) of the deckle 34 can be ensured. Thereby, the yield of a resin molded product can be secured stably.

  Further, in the manufacturing apparatus 20, the molten resin P around the deckle 34 is cooled by the deckle 34 cooled by the cooling apparatus 40. As a result, the viscosity of the molten resin P around the deckle 34 is increased, and leakage of the molten resin P from the gap between the surface 22A of the die 22 and the deckle 34 is suppressed. Further, since the deckle 34 is cooled by the cooling device 40, thermal expansion due to the heat of the molten resin P is suppressed. Thereby, it can suppress effectively that the deckle 34 contacts the surface 22A. Furthermore, the rigidity of the end portion PE in the width direction of the molten resin P extruded in a sheet shape becomes higher than that of the central portion by the cooled deckle 34 as described above. Thereby, the sheet | seat shape of the molten resin P extruded to the sheet form is maintainable.

  In the cooling device 40, since the cooling water is sent out to the flow path 42 formed inside the deckle 34 using the pump 44, the deckle 34 can be efficiently cooled. Thereby, the leakage of the molten resin P from the gap between the surface 22A of the die 22 and the deckle 34 is effectively suppressed.

  In the manufacturing apparatus 20 of the above-described embodiment, the deckle 34 is moved in a direction orthogonal to the moving direction of the lip 26, but the present invention is not limited to this structure. If the opening amount B of the extrusion port 24 by the deckle 34 can be adjusted, for example, the deckle 34 may be moved in a direction inclined with respect to the moving direction of the lip 26.

  In the manufacturing apparatus 20 of the above-described embodiment, a servo motor is used as the actuator 32, but the present invention is not limited to this configuration. As long as the opening amount A of the extrusion port 24 by the lip 26 can be adjusted, for example, an air cylinder or a hydraulic cylinder may be used. Similarly, an air cylinder or a hydraulic cylinder may be used as the actuator 38 as long as the opening amount B of the extrusion port 24 by the deckle 34 can be adjusted.

  Furthermore, in the manufacturing apparatus 20 of the above-described embodiment, the deckles 34 are arranged on both sides in the longitudinal direction of the extrusion port 24, but the present invention is not limited to this configuration, and the deckles 34 are disposed in the longitudinal direction of the extrusion port 24. It is good also as a structure arrange | positioned only at one side.

  Furthermore, in the manufacturing apparatus 20 of the above-described embodiment, the flow path 42 is formed inside the deckle 34, and the cooling medium (cooling water) is sent to the flow path 42 using the pump 44 to cool the deckle 34. However, the present invention is not limited to this configuration. The deckle 34 may be cooled by blowing cold air to the deckle 34. Further, a fin or the like may be provided on the deckle 34 to dissipate heat.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

20 Manufacturing Equipment 22 Die 22A Surface 24 Extrusion Port 26 Lip (First Adjustment Member)
34 Dickel (second adjustment member, adjustment member)
40 Cooling device (cooling means)
42 Flow path 44 Pump (delivery device)
50 Fuel tank 52 Tank body G Gap A Opening amount (opening direction of extrusion port in short direction)
B Opening amount (opening amount in the longitudinal direction of the extrusion port)
P molten resin WP1, WP2 resin sheet T width of molten resin W thickness of molten resin

Claims (7)

A die having an extrusion port for extruding the molten resin into a sheet,
A first adjustment member that is provided on the die and moves in a direction orthogonal to the extrusion direction of the molten resin to adjust the opening amount in the short direction of the extrusion port;
Provided downstream of the first adjustment member of the die in the extrusion direction, and moved in a direction orthogonal to the extrusion direction and in a direction intersecting the movement direction of the first adjustment member, the length of the extrusion port A second adjustment member for adjusting the opening amount of the direction;
An apparatus for manufacturing a resin sheet.   The said 2nd adjustment member is a manufacturing apparatus of the resin sheet of Claim 1 arrange | positioned with a clearance gap with respect to the surface of the said die in which the said extrusion port was formed, and moving along the said surface.   The resin sheet manufacturing apparatus according to claim 1, further comprising a cooling unit that cools the second adjustment member.   The said cooling means is a manufacturing apparatus of the resin sheet of Claim 3 which has the flow path formed inside the said 2nd adjustment member, and the sending-out apparatus which sends out a cooling medium to the said flow path. A supplying step of supplying the molten resin to a die having an extrusion port for extruding the molten resin into a sheet;
A thickness adjustment step of adjusting the opening amount of the extrusion port in the short direction and adjusting the thickness of the molten resin extruded into a sheet shape,
A width adjustment step of adjusting the width of the molten resin, the thickness of which is adjusted by adjusting the opening amount in the longitudinal direction of the extrusion port,
A method for producing a resin sheet.   The method for producing a resin sheet according to claim 5, wherein, in the width adjusting step, the width of the molten resin whose thickness is adjusted is adjusted while cooling an adjustment member that adjusts an opening amount of the extrusion port in the longitudinal direction. .   The manufacturing method of the fuel tank which manufactures the tank main body of a fuel tank using the resin sheet manufactured with the manufacturing method of the resin sheet of Claim 5 or Claim 6.