Resin molding material tank and manufacturing method of the same

Abstract

To provide a resin molding material tank with a metal door member with of a lateral width dimension and a depth dimension of 50 cm or more which improves opening and closing operability of the door member and a manufacturing method of the same.SOLUTION: A door member 54 has a first door half part 54A attached to a front edge part 53A of a fixed closing part 53 via a first hinge mechanism 55, and a second door half part 54B attached to the first door half part 54A via a second hinge mechanism 56. A stopper part 57 which comes into contact with a surface of the first door half part 54A, and prevents the door member 54 from turning to a rear side thereof, in a state in which the first door half part 54A is turned to the rear side centering around the first hinge mechanism 55 on the fixed closing part 53 of a lid member 5 and the second door half part 54B is turned centering around the second hinge mechanism 56 so as to approach a rear surface of the first door half part 54A and the door member 54 is folded.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a resin molding material tank that stores a resin material to be supplied to a resin molding machine, and a method for manufacturing the same. [Background technology]

[0002] Non-Patent Document 1 (http:yotsuba-tsusyo.sblo.jp / article / 186873707.html) discloses a conventional example of a resin molding material tank called a pellet tank with a hinged lid door. In this conventional resin molding material tank, a metal lid member with a window is attached to a metal tank body via a hinge mechanism. In order to prevent the resin molding material from being charged with static electricity, the tank body and the lid member of the resin molding material tank are made of metal. In addition, the lid member needs to be heavy enough not to be easily opened in order to prevent dust from entering. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] http:yotsuba-tsusyo.sblo.jp / article / 186873707.html Summary of the Invention [Problem to be solved by the invention]

[0004] If the width and depth of the door member exceed 50 cm, the weight of the metal lid member becomes quite heavy, and when the resin molding material is poured into the tank body, the lid member is removed from the tank body, and the force corresponding to the weight of the lid member is required for the operation. For this reason, as in the above-mentioned conventional technology, a resin molding material tank has been proposed in which the door member can be opened while attached to the tank body using a hinge mechanism. However, the larger the dimensions of the door member, the longer the rotation distance of the door member becomes, even if the door member can be opened without removing it from the tank body using the hinge mechanism, and the worse the workability becomes. Therefore, the inventors thought of making the door member a folding (bi-fold) door member. However, when a folding door member is used, although the rotation distance of the door member is shortened, depending on the position of the folded door member, a situation may occur in which the worker must assume an unnatural position when pulling back the door member, or a situation may occur in which a greater force is required than when opening the door member.

[0005] The object of the present invention is to provide a resin molding material tank and a manufacturing method thereof that can improve the ease of opening and closing the door member of a resin molding material tank equipped with a metal door member having a width and depth dimension of 50 cm or more. [Means for solving the problem]

[0006] The resin molding material tank that is the subject of improvement of the present invention is a resin molding material tank that includes a metal tank body into which resin material to be supplied to a resin molding machine is filled from an upper opening and which stores the resin material therein, and a removable metal door member that closes the upper opening of the tank body, the upper opening of the tank body having a width dimension of 50 cm or more and a depth dimension of 50 cm or more. In the present invention, the lid member includes a frame body that has an opening facing the upper opening of the tank body and fits inside or outside the upper opening of the tank body, a fixed closing part that is fixed to the rear depth region of the frame body and extends in the width direction, closing a part of the opening of the frame body, and a foldable door member that is attached to the front edge of the fixed closing part via a first hinge mechanism and closing the remaining part of the opening of the frame body. The door element has a first door half attached to the front edge of the fixed closing part via a first hinge mechanism, a second door half attached to the first door half via a second hinge mechanism, and a grip part provided on the front edge of the second door half and extending in the width direction. The fixed closing part is provided with a stopper part that contacts the surface of the first door half to prevent the door element from rotating backward when the first door half is rotated backward around the first hinge mechanism and the second door half is rotated around the second hinge mechanism so as to approach the back surface of the first door half to fold the door element. By providing such a stopper part, the rotation range of the door element can be restricted, so that the worker who opens and closes the door element folded in two can be opened and closed more easily than before without forcing them to take an unnatural posture.

[0007] The stopper portion can be structured to have an inclined surface that extends in the width direction and diagonally upward on the depth side and contacts the surface of the first door half of the lid member that has been rotated to the depth side around the first hinge mechanism. It is also preferable that, when the door member is folded in two, both ends of the front edge of the second door half are in contact with the upper end surface of the frame. With the stopper portion configured in this way, the first door half of the door member folded in two can be supported by the entire inclined surface of the stopper portion, so that deformation of the lid member can be prevented even if it is repeatedly opened and closed. In addition, when the first door half of the door element folded in two is in contact with the stopper portion, the second door half and the grip portion face the front side of the tank body, and both ends of the front edge of the second door half are in contact with the upper end surface of the frame, so that by an operator grasping the grip portion and pulling it toward himself, the first door half rotates around the first hinge mechanism in a direction toward the opening, and the second door half rotates around the second hinge mechanism in a direction aligned in a straight line with the first door half while being supported by the upper end surface of the frame, ultimately assuming a position that closes the opening of the frame. As a result, the door element can be closed more smoothly and with less force than before.

[0008] The inclination angle of the inclined surface is preferably 105° to 120°. Within this angle range, the door member folded in two can be reliably prevented from falling forward, and the worker can easily grasp the gripping portion and pull it.

[0009] The stopper portion may be formed by bending a metal plate so that the longitudinal cross section has a triangular shape. By using a stopper portion of such a structure, a robust stopper portion can be produced at low cost, and the stopper portion can be easily fixed to the fixed closing portion.

[0010] The first door half and the second door half are integrally formed by bending first and second metal plates, respectively. In this case, it is preferable that a front edge portion adjacent to the second hinge mechanism of the first door half and a rear edge portion adjacent to the second hinge mechanism of the second door half are provided with first and second bent portions formed by bending the first and second metal plates, respectively, and extending in the width direction. When the first door half and the second door half are integrally formed by bending the first and second metal plates, respectively, if the dimensions of the door element are large, the first and second door halves are easily deformed when the door element is opened. Therefore, by bending the first and second metal plates to provide first and second bending portions extending in the width direction at the front edge adjacent to the second hinge mechanism of the first door half and the rear edge adjacent to the second hinge mechanism of the second door half, respectively, the first and second bending portions become reinforcing structural portions of the metal plates, making it possible to easily prevent deformation of the first and second door halves when the door members are opened.

[0011] The first and second door halves may be formed by processing the first and second metal plates, respectively, and the gripping portion may be formed by bending a second side of the metal plate located on the opposite side to the first side of the metal plate to which the second hinge mechanism is attached. By using such a gripping portion, the gripping portion can be formed and attached to the door element only by bending, thereby reducing the number of parts and the number of processing steps. The gripping portion also serves as a reinforcing structure that reinforces the second door element made of a metal plate.

[0012] The gripping portion preferably has a structure in which a rising portion rising from the surface portion of the second door half and an opposing portion extending in a direction intersecting the rising portion and opposing the surface portion of the second door half are integrated together. In this case, the length of the gripping portion in the width direction is such that, when the first door half is in contact with the stopper portion, the base of the rising portion forms the front edge and abuts against the upper end surface of the frame. By configuring the gripping portion in this way, not only does the gripping portion function as a reinforcing portion that increases the mechanical strength of the second door half, but the gripping portion can also be easily and strongly configured by simply processing the plate material.

[0013] A portion of the second door half adjacent to the second hinge mechanism may be provided with an auxiliary gripping portion that is gripped by an operator when lifting the second door half upward. When the dimensions of the lid member become large, the operator can hold the gripping portion with one hand and the auxiliary gripping portion with the other hand to open and close the door member in a two-point gripping position, and the lid member can be opened and closed without increasing the burden on the operator.

[0014] The auxiliary gripping portion may be provided integrally with the second bent portion, which not only eliminates the need to prepare the auxiliary gripping portion as a separate part, but also eliminates the need to perform an operation to attach the auxiliary gripping portion.

[0015] The present invention can also be understood as a manufacturing method for a resin molding material tank. In the manufacturing method, the first door half and the second door half are integrally formed by bending a first and a second metal plate, respectively, and the grip part is formed by bending one edge part of the second metal plate. In addition, the first and second metal plates may be bent at a front edge part adjacent to the second hinge mechanism of the first door half and at a rear edge part adjacent to the second hinge mechanism of the second door half, respectively, to form first and second bent parts extending in the width direction. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1A is a perspective view of a resin molding material tank according to a first embodiment of the present invention with a lid member closed, and FIG. 1B is a plan view of the first embodiment. [Diagram 2] 1 is a perspective view of a resin molding material tank according to a first embodiment of the present invention, showing a state in which a door member is slightly folded. FIG. [Diagram 3] 4 is a perspective view showing a state in which the door member of the resin molding material tank according to the first embodiment of the present invention is further folded. FIG. [Figure 4] 1 is a perspective view showing a state in which a door member of a resin molding material tank according to a first embodiment of the present invention is folded and brought into contact with a stopper portion. FIG. [Diagram 5] 1 is a perspective view of a state in which a door member of a resin molding material tank according to a first embodiment of the present invention is in contact with a stopper portion without being folded. FIG. [Figure 6] 11(A) to 11(D) are diagrams sequentially showing the process of folding the door member. [Figure 7] FIG. 11 is a perspective view of a resin molding material tank according to a second embodiment of the present invention with a door member in a closed state. [Figure 8] FIG. 11 is an enlarged perspective view of a door member according to a second embodiment. [Figure 9] FIG. 11 is a perspective view of a resin molding material tank according to a second embodiment of the present invention, with a door member partially folded. [Figure 10] 13 is a perspective view showing a state in which a door member of a resin molding material tank according to a second embodiment of the present invention is folded and brought into contact with a stopper portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, the resin molding material tank and the manufacturing method thereof according to the present invention will be described in detail with reference to the drawings. Figures 1 to 5 are perspective views of the first embodiment of the resin molding material tank according to the present invention, showing different opening and closing states of the lid member. Figures 6(A) to 6(D) are views for explaining the deformation state of the lid member during the opening and closing operation.

[0018] The resin molding material tank 1 of the first embodiment includes a tank body 3 and a lid member 5. The tank body 3 includes a metal body 31 that is filled with the resin material to be supplied to a resin molding machine from an upper opening and stores the resin material inside, and four legs 32 that support the body 31. The body 31 and the legs 32 are each formed by joining a plurality of parts formed by machining a metal plate such as a stainless steel plate, such as cutting and bending, and an exhaust structure (not shown) that is attached to the bottom wall 31A to exhaust the resin material. Although not shown in the figure, in order to attach the exhaust structure (not shown), the bottom wall 31A has a shape that converges toward the center like a pyramid, and the exhaust structure (not shown) is attached to the center. The structure of the bottom wall 31A and the structure of the exhaust structure are arbitrary.

[0019] The main body 31 of the tank body 3 has four side walls 31B to 31E rising from the four sides of the bottom wall 31A. As shown in FIG. 5, the four side walls 31B to 31E are provided with a peep hole 33 fitted with a transparent plate 34. The presence of the peep hole 33 allows the remaining amount of the resin molding material to be visually confirmed without opening the cover member 5. The space surrounded by the four side walls 31B to 31E is a storage space 35 for storing the pellet-shaped resin molding material, and the upper area of ​​the storage space 35 constitutes the upper opening 36 of the tank body 3. In the resin molding material tank of this embodiment, the upper opening 36 of the main body 31 of the tank body 3 has a width dimension of 50 cm or more and a depth dimension of 50 cm or more, and the total weight is about 30 kg or more. Incidentally, there is a large tank body of 85 cm x 85 cm.

[0020] A valve to which a transfer pipe for transferring the resin molding material to a resin molding machine is connected is attached to the bottom wall 31A of the main body 31. The structure for discharging the resin molding material is arbitrary.

[0021] The lid member 5 is configured to be removable so as to close the upper opening 36 of the main body 31 of the tank body 3. The lid member 5 used in this embodiment is configured by joining or combining a plurality of parts formed by cutting and bending a metal plate such as a stainless steel plate, similar to the main body 31 of the tank body 3. The lid member 5 of this embodiment includes a frame 52 having an opening 51 facing the upper opening 36 of the main body 31 of the tank body 3 and fitting to the outside of the upper opening 36 of the main body 31 of the tank body 3, a fixed closing part 53 fixed to the rear depth region of the frame 52 and extending in the width direction, closing a part of the opening 51 of the frame 52, and a door member 54. As shown in FIG. 1 and FIG. 5, the door member 54 has a folding door structure attached to the front edge 53A of the fixed closing part 53 via a first hinge mechanism 55 and closing the remaining part of the opening 51 of the frame 52. The first hinge mechanism 55 is constituted by three hinge fittings 55A to 55C fixed along the front edge portion 53A of the fixed closing part 53.

[0022] The door member 54 has a first door half 54A attached to the front edge 53A of the fixed blocking part 53 via a first hinge mechanism 55, a second door half 54B attached to the first door half 54A via a second hinge mechanism 56, and a gripping part 54C integrally provided on the front edge 54Ba of the second door half 54B and extending in the width direction. The first door half 54A is made of a first metal plate. The second hinge mechanism 56 is made of three hinge fittings 56A to 56C that connect the first door half 54A and the second door half 54B. The second door half 54B and the gripping part 54C are integrally formed by bending a second metal plate. The gripping portion 54C is formed by bending the second side of the second door half 54B, which is located on the opposite side to the first side of the second door half 54B to which the second hinge mechanism 56 is attached. By using such a gripping portion 54C, the gripping portion 54C can be formed and attached only by bending, so that the number of parts and the number of processing steps can be reduced. The gripping portion 54C has a structure in which a rising portion 54Ca rising from a front edge portion 54Ba of a surface portion 54Bo of the second door half 54B [FIG. 6(A)] and an opposing portion 54Cb extending in a direction intersecting the rising portion 54Ca and opposing the surface portion 54Bo of the second door half 54B are integrated. The length of gripping portion 54C in the width direction is such that, when first door half 54A is in contact with stopper portion 57 (described later), the base of rising portion 54Ca forms front edge portion 54Ba and abuts against the upper end surface of frame body 52. ​​By configuring gripping portion 54C in this manner, not only does gripping portion 54C function as a reinforcing portion that enhances the mechanical strength of second door half 54B, but gripping portion 54C can also be configured simply and strongly by simply processing the plate material.

[0023] 1 and 2, the fixed blocking portion 53 is provided with a stopper portion 57 that comes into contact with the front surface of the first door half 54A to prevent the door element 54 from pivoting backward when the first door half 54A is pivoted backward about the first hinge mechanism 55 and the second door half 54B is pivoted toward the rear surface of the first door half 54A about the second hinge mechanism 56 to fold the door element 54. By providing the stopper portion 57, the pivot range of the door element 54 can be restricted, so that the worker who opens and closes the folded door element 54 is not forced into an awkward position and can open and close the door more easily than before.

[0024] The stopper portion 57 extends in the width direction and diagonally upward on the depth side, and has a structure with an inclined surface 57A that comes into contact with the surface of the first door half 54A of the door element 54 that has rotated to the depth side around the first hinge mechanism 55. The stopper portion 57 is formed by bending a plate material so that its vertical cross section forms a triangle. By using the stopper portion 57 with such a structure, a robust stopper portion can be produced at low cost, and the stopper portion 57 can be easily fixed to the fixed blocking portion 53.

[0025] In this embodiment, when the door element 54 is folded in two, both ends of the front edge 54Ba of the second door half 54B are in contact with the upper end surface 52A of the frame 52. By configuring the stopper portion 57 in this way, the first door half 54A of the door element 54 folded in two can be supported by the entire inclined surface 57A of the stopper portion 57, so that deformation of the door element 54 can be prevented even if it is repeatedly opened and closed. In addition, when the first door half 54A of the door member 54 folded in two is in contact with the stopper portion 57, the second door half 54B and the grip portion 54C face the front side of the tank body 3, and both ends of the front edge portion 54Ba of the second door half 54B are in contact with the upper end surface 52A of the frame body 52, so that when an operator grasps the grip portion 54C and pulls it toward himself, the first door half 54A rotates around the first hinge mechanism 55 in a direction toward the opening 51, and the second door half 54B rotates around the second hinge mechanism 56 in a direction aligned in a straight line with the first door half 54A while being supported by the upper end surface 52A of the frame body 52, and finally assumes a position that closes the opening 51 of the frame body 52. ​​As a result, the door member 54 can be closed more smoothly and with less force than before.

[0026] According to the inventor's research, it has been found that the inclination angle θ of the inclined surface 57A from the upper end surface 52A is preferably 105° to 120°. It is preferable to make this inclination angle θ smaller as the width dimension × depth dimension 50 cm × 50 cm of the upper opening 36 of the main body part 31 of the tank main body 3 increases. This angle range reliably prevents the door member 54 folded in two from falling forward, and also makes it easier for an operator to grasp and pull the grip part 54C.

[0027] 7 to 10 are perspective views showing the structure of a resin molding material tank and a manufacturing method thereof according to a second embodiment of the present invention. In Fig. 7 to 10, the same parts as those in the first embodiment shown in Fig. 1 to 6 are denoted by the same reference numerals as those in Fig. 1 to 6. In the case where the first door half 54A and the second door half 54B are integrally formed by metal processing the first and second metal plates, respectively, if the dimensions of the door element 54 are large, the first and second door halves 54A and 54B are easily deformed when the door element 54 is opened. 8, in the second embodiment, first and second bent portions 54Ab and 54Bd are formed by bending the first and second metal plates and extend in the width direction and are integrally provided on the front edge 54Aa adjacent to the second hinge mechanism 56 of the first door half 54A and the rear edge 54Bc adjacent to the second hinge mechanism 56 of the second door half 54B, respectively. When the first and second bent portions 54Ab and 54Bd are provided, the first and second bent portions 54Ab and 54Bd become reinforcing structures of the metal plates, so that the first and second door halves 54A and 54B can be prevented from being deformed when the door member 54 is opened, as shown in FIGS. 9 and 10. In this embodiment, the first and second bent portions 54Ab and 54Bd are each configured as an inclined portion that is inclined so that the angle between the surface of the first door half 54A and the surface of the second door half 54B is about 45°. The length dimension of the first and second bent portions 54Ab and 54Bd in the inclined direction is about 10 mm.

[0028] In addition, an auxiliary gripping portion 58 is provided at a portion of the second door half 54B adjacent to the second hinge mechanism 56, which is gripped by the worker when the second door half 54B is raised upward. When the size of the cover member becomes large, the worker can grip the gripping portion 54C with one hand and the auxiliary gripping portion 58 with the other hand to open and close the door member 54 in a two-point gripping position. In this embodiment, as shown in FIG. 8, the height dimension of the central portion 54Be in the width direction of the second bent portion 54Bd is larger than the height dimension of the other portions. A circular through hole 54Bf is formed in this central portion 54Be, penetrating the central portion 54Be in the thickness direction, to form the auxiliary gripping portion 58. Therefore, according to this embodiment, there is an advantage that it is not necessary to prepare the auxiliary gripping portion 58 as a separate part, and no work is required to attach the auxiliary gripping portion 58. Incidentally, when the width dimension x depth dimension of the upper opening 36 of the main body part 31 of the tank main body 3 is 85 cm x 85 cm, the dimensions of the auxiliary grip part 58 are 160 mm to 180 mm in the width direction and 70 mm to 90 mm in the height direction. Of course, a ring-shaped cover member made of a flexible material such as rubber may be attached to the edge of the through hole 54Bf. The shape of the through hole 54Bf is not limited to a circular shape.

[0029] In the first and second embodiments, the vertical cross section of the stopper portion 57 is triangular, but it goes without saying that the vertical cross section of the stopper portion may have another shape.

[0030] In the first and second embodiments, the vertical cross-sectional shape of the grip portion 54C is an inverted L-shape, but this vertical cross-sectional shape may be any shape as long as the operator's fingers can be engaged therewith.

[0031] In the above-described first and second embodiments, the first and second hinge mechanisms 55 and 56 are configured by three hinge fittings, but the number of hinge fittings is arbitrary. [Industrial Applicability]

[0032] According to the present invention, the rotation range of the door element can be restricted by providing a stopper portion, so that the worker opening and closing the door element folded in two is not forced into an awkward position, and the door can be opened and closed more easily than before. [Explanation of symbols]

[0033] 1. Resin molding material tank 3 Tank body 31 Main body 31A Bottom wall part 31B to 31E Side wall part 32 Legs 33 Viewport 35 Storage space 36 Upper opening 5 Cover member 51 Opening 52 Frame 52A Top end surface 53 Fixed occlusion 53A Front edge 54 Door parts 54A First Door Half 54B Second Door Half 54C Grip 55 First hinge mechanism 56 Second hinge mechanism 57 Stopper part 57A Slope 58 Auxiliary grip part

Claims

1. A resin molding material tank comprising: a metal tank body into which a resin material to be supplied to a resin molding machine is filled from an upper opening and which stores the resin material therein; and a removable metal cover member which closes the upper opening of the tank body, the upper opening of the tank body having a width dimension of 50 cm or more and a depth dimension of 50 cm or more, The cover member is a frame having an opening facing the upper opening of the tank body and fitted to the outside or inside of the upper opening of the tank body; A fixed closing portion that is fixed to the rear depth region of the frame body, extends in the width direction, and closes a portion of the opening of the frame body; a folding door member attached to a front edge of the fixed closing portion via a first hinge mechanism to close a remaining portion of the opening of the frame; The door member has a first door half attached to the front edge portion via the first hinge mechanism, a second door half attached to the first door half via a second hinge mechanism, and a grip portion provided on the front edge portion of the second door half and extending in the width direction, a stopper portion provided in the fixed closing portion for contacting a surface of the first door half to prevent the door member from pivoting rearward when the first door half is pivoted rearward about the first hinge mechanism and the second door half is pivoted toward a back surface of the first door half about the second hinge mechanism so as to be folded in two.

2. The stopper portion extends in the width direction and in a diagonally upward direction on the depth side, and has an inclined surface that comes into contact with the surface of the first door half that has rotated to the depth side around the first hinge mechanism, 2. The resin molding material tank according to claim 1, wherein, when the door member is folded in two, both ends of the front edge of the second door half are in contact with an upper end surface of the frame.

3. 3. The resin molding material tank according to claim 2, wherein the inclination angle of the inclined surface is 105° to 120°.

4. 4. The resin molding material tank according to claim 3, wherein the stopper portion is formed by bending a metal plate so that the vertical cross section has a triangular shape.

5. The first door half and the second door half are integrally formed by bending a first metal plate and a second metal plate, respectively, 2. The resin molding material tank according to claim 1, wherein a front edge portion of the first door half adjacent to the second hinge mechanism and a rear edge portion of the second door half adjacent to the second hinge mechanism are provided with first and second bent portions formed by bending the first and second metal plates, respectively, and extending in the width direction.

6. The first door half and the second door half are integrally formed by machining first and second metal plates, respectively; 2. The resin molding material tank according to claim 1, wherein the grip portion is located at a front edge portion of the second door half and is configured by bending the second metal plate.

7. The gripping portion has a structure in which a rising portion rising from an edge of a surface portion of the second door half and an opposing portion extending in a direction intersecting the rising portion and opposing the surface portion of the second door half are integrated together, 6. The resin molding material tank according to claim 5, wherein the length of the gripping portion in the width direction is such that, when the first door half is in contact with the stopper portion, the base of the raised portion forms the front edge portion and abuts against the frame body.

8. The resin molding material tank according to claim 1, wherein a portion of the second door half adjacent to the second hinge mechanism is provided with an auxiliary grip portion that is gripped by an operator when lifting the second door half upward.

9. A portion of the second door half adjacent to the second hinge mechanism is provided with an auxiliary gripping portion that is gripped by an operator when lifting the second door half upward, The resin molding material tank according to claim 5 , wherein the auxiliary grip portion is provided integrally with the second bent portion.

10. The tank includes a metal tank body into which a resin material to be supplied to a resin molding machine is filled from an upper opening and which stores the resin material therein, and a removable metal cover member which closes the upper opening of the tank body, the upper opening of the tank body having a width dimension of 50 cm or more and a depth dimension of 50 cm or more, The cover member is a frame having an opening facing the upper opening of the tank body and fitted to the outside or inside of the upper opening of the tank body; A fixed closing portion that is fixed to the rear depth region of the frame body, extends in the width direction, and closes a portion of the opening of the frame body; a folding door member attached to a front edge of the fixed closing portion via a first hinge mechanism to close a remaining portion of the opening of the frame; a door member having a first door half attached to the front edge portion via the first hinge mechanism, a second door half attached to the first door half via a second hinge mechanism, and a grip portion provided on the front edge portion of the second door half and extending in the width direction, The first door half and the second door half are integrally formed by bending a first metal plate and a second metal plate, respectively; A method for manufacturing a resin molding material tank, comprising the steps of: forming the grip portion by bending one edge portion of the second metal plate.

11. 11. The manufacturing method of a resin molding material tank according to claim 10, characterized in that a first and a second bent portion extending in the width direction are formed by bending the first and second metal plates at a front edge portion adjacent to the second hinge mechanism of the first door half and a rear edge portion adjacent to the second hinge mechanism of the second door half, respectively.

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