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Title:
APPARATUS FOR MANUFACTURING RESIN SHEET, METHOD FOR MANUFACTURING RESIN SHEET, AND METHOD FOR MANUFACTURING FUEL TANK
Document Type and Number:
WIPO Patent Application WO/2015/075527
Kind Code:
A1
Abstract:
An apparatus for manufacturing a resin sheet (20) has: an extruder (22) that extrudes a molten resin (P) into a tubular shape; and a cutting machine (28) that has a cutter (30) arranged on a downstream side of the extruder (22) in an extrusion direction of the molten resin, and cuts the tubular molten resin (P) extruded from the extruder (22) along the extrusion direction while the cutter (30) moves reciprocally with respect to the molten resin (P).

Inventors:
ANZAWA TAKAFUMI (JP)
SUZUKI TEPPEI (JP)
Application Number:
PCT/IB2014/002486
Publication Date:
May 28, 2015
Filing Date:
November 19, 2014
Export Citation:
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Assignee:
TOYOTA MOTOR CO LTD (JP)
International Classes:
B29C48/32; B29C69/00; B29C49/04; B29C51/26; B29C48/355; B29C51/14
Domestic Patent References:
WO2012160835A12012-11-29
Foreign References:
JPH06218792A1994-08-09
US3651725A1972-03-28
JPH091640A1997-01-07
JP2005532200A2005-10-27
Download PDF:
Claims:
CLAIMS

1. An apparatus for manufacturing a resin sheet comprising

a cutting machine having an extruder and a cutter, the extruder extruding a molten resin into a tubular shape, the cutter being arranged on a downstream side of the extruder in an extrusion direction of the molten resin, and the cutting machine cutting the molten resin along the extrusion direction while the cutting machine causing reciprocal movement or rotation of the cutter with respect to the tubular molten resin extruded from the extruder.

2. The apparatus for manufacturing a resin sheet according to claim 1, wherein the cutting machine includes the cutter, a tip of a blade surface of which faces an opposite side from the downstream side in the extrusion direction, and a movement portion configured to cause the cutter to move reciprocally in a thickness direction of the tubular molten resin.

3. The apparatus for manufacturing a resin sheet according to claim 1 or 2, further comprising

a guiding portion being arranged on the downstream side of the extruder in the extrusion direction of the molten resin, the guiding portion guiding the sheet-like molten resin cut by the cutter to the outside in a radial direction of an extrusion opening of the extruder, the extrusion opening being in an annular shape when seen in the extrusion direction, and the guiding portion separating cut surfaces of the molten resin from each other.

4. The apparatus for manufacturing a resin sheet according to any one of claims 1 to 3, wherein

the plural cutting machines are provided.

5. A method for manufacturing a resin sheet comprising:

extruding a molten resin into a tubular shape; and

cutting the tubular molten resin that is extruded by a cutter along an extrusion direction while the cutter moves reciprocally or rotates with respect to the molten resin.

6. The method for manufacturing a resin sheet according to claim 5, wherein upon cutting, the cutter cuts the tubular molten resin while moving reciprocally in a thickness direction of the molten resin, a tip of a blade surface of the cutter facing an opposite side from a downstream side in the extrusion direction.

7. The method for manufacturing a resin sheet according to claim 5 or 6, wherein the sheet-like molten resin cut by the cutter is guided to the outside in a radial direction of an extrusion opening of an extruder, the extrusion opening guiding cut surfaces of the molten resin to separate from each other, and the cut surface being in an annular shape when seen in the extrusion direction.

8. A method for manufacturing a fuel tank comprising

manufacturing a tank body of a fuel tank by using a sheet-like molten resin manufactured by the method for manufacturing a resin sheet according to any one of claims 5 to 7.

Description:
APPARATUS FOR MANUFACTURING RESIN SHEET, METHOD FOR MANUFACTURING RESIN SHEET, AND METHOD FOR MANUFACTURING

FUEL TANK BACKGROUND OF THE INVENTION

1. Field of the Invention

[0001] The present invention relates to an apparatus for manufacturing a resin sheet, a method for manufacturing a resin sheet, and a method for manufacturing a fuel tank.

2. Description of Related Art

[0002] An apparatus for manufacturing a resin sheet has been available that cuts open a tubular molten resin extruded from an extruder and forms it in a sheet (for example, Published Japanese Translation of PCT application No. 2005-532200 (JP 2005-532200 A)).

[0003] In JP 2005-532200 A, a roll device applies a tensile force to the extruded molten resin while the tubular molten resin is cut open by a cutter that is fixed below an extrusion opening of the extruder.

[0004] By the way, when the tensile force is not applied to the extruded molten resin, the molten resin is likely to be accumulated on a blade surface of the cutter, which makes it difficult to cut the molten resin stably.

SUMMARY OF THE INVENTION

[0005] The present invention obtains an apparatus for manufacturing a resin sheet that can cut a molten resin stably without applying a tensile force thereto, a method for manufacturing a resin sheet that can cut the molten resin stably without applying the tensile force thereto, and a method for manufacturing a fuel tank, for which the resin sheet manufactured by this method for manufacturing a resin sheet is used.

[0006] An apparatus for manufacturing a resin sheet according to one aspect of the invention includes a cutting machine having an extruder and a cutter, the extruder extruding a molten resin into a tubular shape, the cutter being arranged on a downstream side of the extruder in an extrusion direction of the molten resin, the cutting machine cutting the molten resin along the extrusion direction while the cutting machine causing the cutter to move reciprocally or rotate with respect to the tubular molten resin extruded from the extruder.

[0007] The apparatus for manufacturing a resin sheet according to the one aspect of the invention manufactures a sheet-like molten resin when the cutter of the cutting machine cuts the tubular molten resin extruded from the extruder along the extrusion direction.

[0008] Here, in the above-described apparatus for manufacturing a resin sheet, the cutter cuts the extruded molten resin while moving reciprocally or rotating. Thus, for example, compared to an apparatus in which the extruded molten resin is cut by a fixed cutter, the molten resin can be cut stably without applying a tensile force thereto.

[0009] The apparatus for manufacturing a resin sheet according to the one aspect of the invention has such a superior effect that the molten resin can be cut stably without applying the tensile force thereto.

[0010] In the apparatus for manufacturing a resin sheet, the cutting machine may include the cutter, a tip of a blade surface of which faces an opposite side from the downstream side in the extrusion direction, and a movement portion configured to cause the cutter to move reciprocally in a thickness direction of the tubular molten resin.

[0011] In the apparatus for manufacturing a resin sheet, since the cutter, the tip of the blade surface of which faces the opposite side from the downstream side of the molten resin in the extrusion direction, moves reciprocally in the thickness direction of the tubular molten resin, a shearing force that is generated by the reciprocal movement of the cutter is applied to a portion ' of the tubular molten resin that contacts the blade surface, so as to be able to cut the molten resin. Thus, the molten resin can be cut stably with a simple structure.

[0012] The apparatus for manufacturing a resin sheet has such a superior effect that the molten resin can be cut stably with the simple structure.

[0013] The apparatus for manufacturing a resin sheet may include a guiding portion being arranged on the downstream side of the extruder in the extrusion direction of the molten resin, the guiding portion guiding the sheet-like molten resin cut by the cutter to the outside in a radial direction of an extrusion opening of the extruder, the extrusion opening being in an annular shape when seen in the extrusion direction, and the guiding portion separating cut surfaces of the molten resin from each other. [0014] In the apparatus for manufacturing a resin sheet, the guiding portion guides the sheet-like molten resin cut by the cutter to the outside in the radial direction of the extrusion opening of the extruder that is in the annular shape when seen in the extrusion direction while separating the cut surfaces of the molten resin from each other. Thus, the cut surfaces of the molten resin can be prevented from being adhered to each other again.

[0015] The apparatus for manufacturing a resin sheet has such a superior effect that the cut surfaces of the cut molten resin can be prevented from being adhered to each other again.

[0016] The apparatus for manufacturing a resin sheet may include the plural cutting machines.

[0017] In the apparatus for manufacturing a resin sheet, since the tubular molten resin can be cut by the plural cutting machines, plural pieces of the sheet-like molten resin can be manufactured simultaneously.

[0018] The apparatus for manufacturing a resin sheet has such a superior effect that the plural pieces of the sheet-like molten resin can be manufactured simultaneously.

[0019] A method for manufacturing a resin sheet according to another aspect of the invention includes: extruding a molten resin into a tubular shape; and cutting the tubular molten resin that is extruded along an extrusion direction while a cutter moves reciprocally or rotates with respect to the molten resin.

[0020] In the method for manufacturing a resin sheet according to the other aspect of the invention, upon cutting, the cutter cuts the extruded molten resin while moving reciprocally or rotating. Thus, for example, compared to a method in which the extruded molten resin is cut by a fixed cutter, the molten resin can be cut stably without applying the tensile force thereto.

[0021] The method for manufacturing a resin sheet has such a superior effect that the molten resin can be cut stably without applying the tensile force thereto.

[0022] In the method for manufacturing a resin sheet, in the cutting process, the cutter may cut the molten resin while moving reciprocally in the thickness direction of the tubular molten resin, and the tip of the blade surface of the cutter may face the opposite side from the downstream side in the extrusion direction.

[0023] In the method for manufacturing a resin sheet, upon cutting, the tip of the blade surface of the cutter faces the opposite side from the downstream side in the extrusion direction of the molten resin, and the cutter moves reciprocally in the thickness direction of the tubular molten resin. Accordingly, the shearing force that is generated by the reciprocal movement of the cutter is applied to the portion of the tubular molten resin that contacts the blade surface, so as to be able to cut the molten resin. Thus, the molten resin can be cut stably by a machine with a simple structure.

[0024] The method for manufacturing a resin sheet has such a superior effect that the molten resin can be cut stably by the machine with the simple structure.

[0025] In the method for manufacturing a resin sheet, the sheet-like molten resin cut by the cutter may be guided to the outside in the radial direction of the extrusion opening of the extruder, the extrusion opening may be in the annular shape when seen in the extrusion direction, and the cut surfaces of the molten resin may be separated from each other and guided.

[0026] In the method for manufacturing a resin sheet, upon guiding, the sheet-like molten resin cut by the cutter is guided to the outside in the radial direction of the extrusion opening of the extruder when seen in the extrusion direction, and the cut surfaces of the molten resin are separated from each other. Thus, the cut surfaces of the molten resin can be prevented from being adhered to each other again.

[0027] The method for manufacturing a resin sheet has such a superior effect that the cut surfaces of the cut molten resin can be prevented from being adhered to each other again.

[0028] In a method for manufacturing a fuel tank according to yet another aspect of the invention, a tank body of a fuel tank is manufactured by using the sheet-like molten resin manufactured by the method for manufacturing a resin sheet.

[0029] In the method for manufacturing a fuel tank according to yet another aspect of the invention, the tank body of the fuel tank is manufactured by using the sheet-like molten resin manufactured by the method for manufacturing the resin sheet.

[0030] The method for manufacturing a fuel tank has such a superior effect that the tank body of the fuel tank can be manufactured by using the sheet-like molten resin manufactured by the method for manufacturing the resin sheet.

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Features, advantages, and technical and industrial significance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:

FIG. 1 is a front view in which an apparatus for manufacturing a resin sheet according to one embodiment of the present invention is seen from the front;

FIG. 2 is a cross-sectional view taken along an arrow line 2-2 in FIG. 1 ;

FIG. 3 is a front view of the apparatus for manufacturing a resin sheet in FIG. 1 , and shows a state that a tubular molten resin extruded from an extruder is being cut;

FIG. 4 is an enlarged view of a portion indicated by an arrow 4 in FIG. 3;

FIG. 5 is a side view in which the apparatus for manufacturing a resin sheet in FIG. 1 is seen from a side, and shows the state that the tubular molten resin extruded from the extruder is being cut;

FIG. 6 is an enlarged perspective view in which a portion indicated by an arrow 6 in FIG. 5 is enlarged and seen down diagonally from above;

FIG. 7 is a modified example of the apparatus for manufacturing a resin sheet in FIG. 1, and is a plan view (a view corresponding to FIG. 2) in which a cutting machine is seen from a downstream side in an extrusion direction of the molten resin;

FIG. 8 is a front view of the apparatus for manufacturing a resin sheet in FIG. 7, and shows the state that the tubular molten resin extruded from the extruder is being cut;

FIG. 9 is a front view of a first modified example of the cutting machine used in the apparatus for manufacturing a resin sheet in FIG. 1 ;

FIG. 10 is a front view of a second modified example of the cutting machine used in the apparatus for manufacturing a resin sheet in FIG. 1 ;

FIG. 11 is a front view of a third modified example of the cutting machine used in the apparatus for manufacturing a resin sheet in FIG. 1 ;

FIG. 12 is a cross-sectional view of a fuel tank according to the one aspect of the present invention; and

FIG. 13 is a cross-sectional view of a forming mold, and shows a state that a resin sheet is set in the forming mold for forming the fuel tank in FIG. 12.

DETAILED DESCRIPTION OF EMBODIMENTS

[0032] A description will hereinafter be made on a first embodiment of an apparatus for manufacturing a resin sheet according to the present invention. FIG. 1 shows an apparatus for manufacturing a resin sheet 20 (hereinafter simply referred to as the "apparatus for manufacturing 20") of the first embodiment. Noted that an arrow UP in the drawing indicates an upward direction of the apparatus for manufacturing 20.

[0033] The apparatus for manufacturing 20 of this embodiment is an apparatus for manufacturing a resin sheet, of which a tank body 62 of a fuel tank 60 (see FIG. 12) installed in a vehicle is formed. Noted that the present invention is not limited to this configuration. For example, another component used in the vehicle may be formed of the resin sheet that is manufactured by the apparatus for manufacturing 20. In addition, the application of the resin sheet is not limited to that in the vehicle.

[0034] As shown in FIG. 1, the apparatus for manufacturing 20 includes an extruder 22. An annular extrusion opening 26 (see FIG. 2) is provided in a surface 24A of a die 24 of this extruder 22. A molten resin P is extruded in a tubular shape (a cylindrical shape in this embodiment) from this extrusion opening 26 (see FIG. 3).

Noted that the extrusion opening 26 of this embodiment faces downward. Accordingly, the molten resin P is extruded downward.

[0035] The molten resin P, which is extruded from the extruder 22 of this embodiment, is a molten resin that is multilayered in the extruder 22. More specifically, the molten resin P is configured by including a resin layer and a barrier layer, fuel permeability of which is lower than this resin layer (in which fuel is less likely to be permeated). As an example, high-density polyethylene (HDPE) is used for the resin layer. As an example, ethylene-vinyl alcohol (EVOH) is used for the barrier layer.

Noted that the present invention is not limited to the above configuration, and the molten resin P may have a single resin layer, for example.

[0036] As shown in FIG. 1 and FIG. 3, the apparatus for manufacturing 20 includes a cutting machine 28 on a downstream side of the extruder 22 in an extrusion direction (meaning the same as below the extruder 22 in this embodiment), the cutting machine 28 being provided to cut the tubular molten resin P, which is extruded from the extrusion opening 26, along the extrusion direction.

[0037] The cutting machine 28 includes a cutter 30 that is arranged on a downstream side of the extrusion opening 26 in the extrusion direction and an actuator 32 as an example of the movement portion configured to cause reciprocal movement of the cutter 30 with respect to the tubular molten resin P.

[0038] As shown in FIG. 4 and FIG. 6, the cutter 30 is in a plate shape that has a sharp blade surface 3 OA. A tip of the blade surface 30A of the cutter 30 faces an opposite side from a downstream side of the molten resin P in the extrusion direction (upward in this embodiment). In addition, the blade surface 3 OA of the cutter 30 of this embodiment extends continuously and linearly when seen in a plate thickness direction of the cutter.

[0039] As shown in FIG. 4, the actuator 32 is configured to cause the cutter 30 to move reciprocally with respect to a thickness direction of the tubular molten resin P while allowing the cutter 30 to cut the molten resin P along the extrusion direction. More specifically, as shown in FIG. 2 and FIG. 3, the actuator 32 causes the cutter 30 to move reciprocally along a radial direction of the extrusion opening 26. Meanwhile, in this embodiment, since the molten resin P is extruded in the cylindrical shape from the extrusion opening 26, the same direction is indicated by the thickness direction of the cylindrical molten resin P and the radial direction of the extrusion opening 26. Noted that a direction in which the cutter 30 moves reciprocally is indicated by an arrow X in the drawings.

[0040] As an example, an air cylinder is used as the actuator 32 of this embodiment. The compressed air is supplied from an air compressor (not shown) to this actuator 32 through piping 34. Noted that the present invention is not limited to the above configuration. For example, a configuration in which a hydraulic cylinder, a servomotor, or the like is used as the actuator 32 may be adopted.

[0041] The cutting machine 28 includes a holder 36, an end of which retains the actuator 32 and another end of which is attached to the surface 24A of the die 24. As shown in FIG. 2, this holder 36 is arranged outside the extrusion opening 26 in the radial direction (outside of a circle).

[0042] As shown in FIG. 1 and FIG. 2, in this embodiment, the two cutting machines 28 are attached to positions where they face each other with the extrusion opening 26 being interposed therebetween, in other words, to positions where they are opposed to each other. In addition, directions of the reciprocal movement of the cutters 30 provided in these paired cutting machines 28 are on the same linear line when seen in the extrusion direction as shown in FIG. 2, it being noted that the present invention is not limited to this configuration. For example, the two cutting machines 28 may not be attached at the positions where they face each other with the extrusion opening 26 being interposed therebetween. [0043] As shown in FIG. 1 and FIG. 5, the apparatus for manufacturing 20 includes a roller conveyor 38 on the downstream side of the extruder 22 in the extrusion direction, the roller conveyor 38 being an example of the guiding portion that guides the sheet-like molten resin P cut by the cutter 30 to the outside in the radial direction of the extrusion opening 26 of the extruder 22 when seen in the extrusion direction and that separates cut surfaces PE of the molten resin P from each other.

[0044] The roller conveyor 38 is configured by including paired frames 40 and plural rollers 42 that are arranged between the paired frames 40.

[0045] One end (an upper end in FIG. 1) of the frame 40 that is positioned on an upstream side in the extrusion direction reaches the vicinity of the surface 24A of the die 24. The one end of the frame 40 is positioned inside in the radial direction of the extrusion opening 26 (inside of the circle) (see FIG. 3 and FIG. 5).

[0046] As shown in FIG. 1 and FIG. 5, the frame 40 is inclined from the one end toward the other end (an end positioned on the downstream side in the extrusion direction), which is not shown, in a manner to separate from a linear line Y that passes through the center of the extrusion opening 26. In other words, when seen in the extrusion direction of the molten resin P, the frame 40 is spread to the outside in the radial direction of the extrusion opening 26 from the one end toward the other end (see FIG. 2). Accordingly, as shown in FIG. 1, a space between the paired frames 40 is spread to the halfway from the one end toward the other end.

[0047] Each of ends of the roller 42 is rotatably supported by the frame 40. The sheet-like molten resin P, which is cut by the cutting machine 28, is supported by the plural rollers 42 and transferred to the next process (a setting process, which will be described below). In addition, an outer peripheral surface of the roller 42 is applied with coating or the like to prevent adhesion of the molten resin P.

[0048] As shown in FIG. 2 and FIG. 5, in this embodiment, the roller conveyors 38 are arranged to face each other with the paired cutting machines 28 being interposed therebetween.

[0049] Next, a method for manufacturing a resin sheet according to the present invention will be described. Noted that, in the method for manufacturing a resin sheet of this embodiment, the resin sheet is manufactured by using the apparatus for manufacturing 20. [0050] (Extrusion process) As shown in FIG. 3, the molten resin P is extruded in the tubular shape from the extrusion opening 26 of the extruder 22.

[0051] (Cutting process) Next, the actuator 32 of the cutting machine 28 is actuated to cause the cutter 30 to move reciprocally and cut the tubular molten resin P, which is extruded from the extruder 22, along the extrusion direction. More specifically, the cutter 30 cuts the molten resin P along the extrusion direction while moving reciprocally along the thickness direction of the molten resin P (the radial direction of the tubular molten resin P). Here, in the cutting process, the cutter 30 cuts the extruded molten resin P while moving reciprocally. Thus, the molten resin P can be cut stably without applying a tensile force thereto (the detail will be described below). In addition, the molten resin P can be cut stably by the cutting machine 28 with a simple structure that causes the cutter 30 to move reciprocally, the tip of the blade surface 30A of the cutter 30 facing the opposite side from the downstream side of the molten resin P in the extrusion direction.

[0052] (Guiding process) Next, as shown in FIG. 5, the roller conveyor 38 guides the sheet-like molten resin P cut by the cutter 30 to the outside in the radial direction of the extrusion opening 26 (a direction to separate from the linear line Y) while the cut surfaces PE of the molten resin P are separated from each other. Here, in the guiding process, since the roller conveyor 38 guides the sheet-like molten resin P that has been cut to the outside in the radial direction of the extrusion opening 26, the cut surfaces PE of the sheet-like molten resin P that has been cut are separated from each other. Thus, the cut surfaces PE of the sheet-like molten resin P can be prevented from being adhered to each other again.

[0053] Then, the sheet-like molten resin P cut by the cutter 30 is guided by the roller conveyor 38 to a mounting table, which is not shown, and subjected to cutting work to be formed in a specified sheet shape. Accordingly, a resin sheet WP in a molten state is manufactured.

[0054] Next, a method for manufacturing a fuel tank according to the present invention will be described. Noted that, in the method for manufacturing a fuel tank of this embodiment, as shown in FIG. 13, the resin sheet WP in the molten state (hereinafter simply described as the "resin sheet WP") is used to manufacture the tank body 62 of the fuel tank 60 (see FIG. 12). [0055] The resin sheet WP, which is transferred from the roller conveyor 38 of the apparatus for manufacturing 20 and mounted on the above-described mounting table, is set in an upper forming mold 66 (see FIG. 13) for forming a tank body upper portion 64 (see FIG. 12) by a transfer apparatus, which is not shown. After the tank body upper portion 64 is shaped by vacuum forming, a built-in component is fixed. Meanwhile, the other resin sheet WP is set in a lower forming mold 70 (see FIG. 13) for forming a tank body lower portion 68 (see FIG. 12) by another transfer apparatus, which is not shown. After the tank body lower portion 68 is shaped by the vacuum forming, another built-in component is fixed.

[0056] Then, the upper forming mold 66 and the lower forming mold 70 are closed, and an outer peripheral edge 64A of the tank body upper portion 64 and an outer peripheral edge 68 A of the tank body lower portion 68 are stacked and joined to form the hollow tank body 62. Next, the molten resin is cooled and hardened, the upper forming mold 66 and the lower foraiing mold 70 are opened, and the tank body 62 is ejected from the molds to complete manufacturing of the tank body 62.

[0057] Then, a fuel tank component is attached to the tank body 62 to finish the fuel tank 60. Noted that the method for manufacturing a fuel tank of the present invention is not limited to the above configuration. For example, pressure forming or press foraiing may be used to shape the tank body upper portion 64 and the tank body lower portion 68.

[0058] Next, effects of the apparatus for manufacturing 20 of this embodiment will be described. In the apparatus for manufacturing 20, the extruded molten resin P is cut while the cutter 30 moves reciprocally. Here, in addition to a pressing force F (see FIG. 6) generated by own weight of the molten resin P that is extruded from the extruder 22, a shearing force generated by the reciprocal movement of the cutter 30 is applied to a portion of the tubular molten resin P that contacts the blade surface 30A (a cut portion 44). Thus, the molten resin P can be cut stably without applying the tensile force to the molten resin P. In addition, the adhesion of the molten resin P to the blade surface 3 OA can be suppressed by the reciprocal movement of the cutter 30.

[0059] The molten resin P can be cut stably with such a simple structure that the cutter 30 moves reciprocally, the tip of the blade surface 3 OA of the cutter 30 facing the opposite side from the downstream side of the molten resin P in the extrusion direction. [0060] In the apparatus for manufacturing 20, the roller conveyor 38 guides the sheet-like molten resin P that has been cut to the outside in the radial direction of the extrusion opening 26, and the cut surfaces PE of the sheet-like molten resin P that has been cut thereby separate from each other. Thus, the cut surfaces PE of the molten resin P that has been cut can be prevented from being adhered to each other again.

[0061] Furthermore, in the apparatus for manufacturing 20, since the extruded tubular molten resin P can be cut by the two cutting machines 28, two pieces of the sheet-like molten resin P can be manufactured simultaneously.

[0062] The apparatus for manufacturing 20 of the above-described embodiment has the configuration in which the two cutting machines 28 are provided. However, the present invention is not limited to this configuration. For example, a configuration may be adopted in which the three or more cutting machines 28 are provided, or, as shown in FIG. 7, a configuration may be adopted in which the one cutting machine 28 is provided. When the one cutting machine 28 is provided, as shown in FIG. 8, the tubular molten resin P that is extruded from the extruder 22 is cut open, and one piece of the sheet-like molten resin P is manufactured.

[0063] In addition, as shown in FIG. 4, the apparatus for manufacturing 20 of the above-described embodiment has the configuration in which the cutter 30 moves reciprocally along the thickness direction of the tubular molten resin P. However, the present invention is not limited to this configuration. For example, as shown in FIG. 9, a configuration may be adopted in which the cutter 30 moves reciprocally in a direction to cross the thickness direction of the tubular molten resin P (a diagonal direction in FIG. 9). Also with this configuration, the shearing force can be applied to cut the cut portion 44 of the tubular molten resin P.

[0064] Furthermore, the apparatus for manufacturing 20 of the above-described embodiment has the configuration in which the cutter 30 cuts the molten resin P along the extrusion direction while moving reciprocally by the actuator 32. However, the present invention is not limited to this configuration. For example, like a cutting machine 46 shown in FIG. 10, a configuration may be adopted in which a cutter 48 is vibrated by ultrasound and cuts the tubular molten resin P along the extrusion direction. More specifically, it is configured that vibration generated by an oscillator 50, which is formed of a piezoelectric element, is amplified by a horn 52 and transferred to the cutter 48. In addition, a tip of a blade surface 48A of the cutter 48 faces the opposite side from the downstream side of the molten resin P in the extrusion direction (faces upward in FIG. 10), and vibrates in the extrusion direction of the molten resin P (a up and down direction in this embodiment). Noted that the vibration of the cutter 48 is included in the reciprocal movement. Here, since the cutter 48 is vibrated by the ultrasound and contacts the molten resin P, the molten resin P can easily be cut. In addition, the adhesion of the molten resin P to the blade surface 48 A can be suppressed.

[0065] Furthermore, as shown in FIG. 2 and FIG. 4, the apparatus for manufacturing 20 of the above-described embodiment has the configuration in which the cutter 30 moves reciprocally in the thickness direction of the tubular molten resin P. However, the present invention is not limited to this configuration. For example, like a cutting machine 54 shown in FIG. 1 1, a disc-shaped cutter 56 may be used to cut the tubular molten resin P along the extrusion direction. More specifically, the cutter 56 is configured such that power (a rotational force) of a motor 58 is transmitted to an axial portion thereof to cause a high-speed rotation. Since a blade surface 56A is brought into contact with the tubular molten resin P while this cutter 56 rotates at a high speed, the molten resin P can be cut by applying the shearing force to the cut portion 44 of the molten resin P. In addition, due to rotation of the blade surface 56A, the adhesion of the molten resin P to the blade surface 56A can be suppressed by a centrifugal force. Noted that an arrow R direction in the drawing indicates a rotational direction.

[0066] The tubular molten resin P may be cut along the extrusion direction while the above-described cutter 56 rotates and vibrates (vibrates ultrasonically). Accordingly, the tubular molten resin P can easily be cut with lowered friction resistance. Furthermore, the tubular molten resin P may be cut along the extrusion direction while the above-described cutter 30 moves reciprocally and vibrates (vibrates ultrasonically). Also in this case, the tubular molten resin P can easily be cut with the lowered friction resistance.

[0067] In the above-described embodiment, the tip of the blade surface 30A of the cutter 30 is configured to continuously and linearly extend when seen in the plate thickness direction. However, the present invention is not limited thereto. For example, the tip of the blade surface 30A of the cutter 30 may have a saw shape or a continuously curved shape when seen in the plate thickness direction. Similarly, a tip of the blade surface 56A of the cutter 56 has a continuously curved shape when seen in the plate thickness direction. However, the present invention is not limited thereto. For example, the tip of the blade surface 56A of the cutter 56 may have the saw shape or a polygonal shape when seen in the plate thickness direction.

[0068] The apparatus for manufacturing 20 of the above-described embodiment has the configuration in which the sheet-like molten resin P that has been cut is guided by the roller conveyor 38. However, the present invention is not limited to this configuration. For example, a belt conveyor may be used instead of the roller conveyor 38. When the belt conveyor is used, it is preferred to use a belt that is formed of a material to which the molten resin P is less likely to be adhered or a belt, a surface of which is coated with a material to which the molten resin P is less likely to be adhered.

[0069] In the apparatus for manufacturing 20 of the above-described embodiment, the molten resin P can be cut stably by the cutting machine 28 without applying the tensile force to the molten resin P that is extruded from the extruder 22. However, when the tensile force is applied, the molten resin P can be cut stably by the cutting machine 28 for a long time period.

[0070] The one embodiment of the present invention has been described so far. Needless to say, the present invention is not limited to the above embodiment, and various modifications can be made thereto within the scope of the gist of the present invention.