Resin Molding Material Tank and Method for Manufacturing 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 for storing a resin material supplied to a resin molding machine and a method for manufacturing the same.

Background Art

[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 lid hinge opening / closing door. In this conventional resin molding material tank, a single metal lid member provided with a window portion is attached to a metal tank body via a hinge mechanism. The resin molding material tank has a metal tank body and a lid member in order to prevent the resin molding material from being charged with static electricity. In addition, the lid member needs to have a weight that does not easily open in order to prevent the entry of dust.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the width dimension and the depth dimension of the door member exceed 50 cm respectively, the weight of the metal lid member becomes quite heavy. When putting the resin molding material into the tank body, if one tries to remove the lid member from the tank body, a force corresponding to the weight of the lid member is required for this operation. Therefore, as in the above prior art, a resin molding material tank has been proposed in which the door member can be opened while being attached to the tank body using a hinge mechanism. However, as the size of the door member increases, even if it can be opened without removing the door member from the tank body using the hinge mechanism, the rotation distance of the door member becomes longer and the workability deteriorates. Thus, the inventor considered making the door member a foldable (double-fold) door member. However, when using a foldable door member, although the rotation distance of the door member becomes shorter, depending on the posture of the folded door member, a situation may occur where the operator has to take an awkward posture when pulling back the door member, or a situation may occur where a greater force is required than when opening the door member.

[0005] An object of the present invention is to provide a resin molding material tank and a manufacturing method thereof that can improve the opening and closing operability of the door member of a resin molding material tank provided with a metal door member having a width dimension and a depth dimension of 50 cm or more respectively.

Means for Solving the Problem

[0006] The resin molding material tank to be improved by the present invention includes a metal tank body in which a resin material to be supplied to a resin molding machine is filled from an upper opening and the resin material is stored inside, and a removable metal door member that closes the upper opening of the tank body. The resin molding material tank has a lateral width dimension of 50 cm or more and a depth dimension of 50 cm or more at the upper opening of the tank body. In the present invention, the lid member has an opening facing the upper opening of the tank body, a frame body that fits outside or inside the upper opening of the tank body, and is fixed to the rear region in the depth direction of the frame body and extends in the lateral direction, and a fixed closing portion that closes a part of the opening of the frame body. The lid member includes a folding door member that is attached to the front edge of the fixed closing portion via a first hinge mechanism and closes the remaining part of the opening of the frame body. The door member includes a first door half portion attached to the front edge of the fixed closing portion via a first hinge mechanism, a second door half portion attached to the first door half portion via a second hinge mechanism, and a gripping portion provided at the front edge of the second door half portion and extending in the lateral direction. And on the fixed closing portion, with the first hinge mechanism as the center, the first door half portion is rotated backward and the second door half portion is rotated around the second hinge mechanism so as to approach the back surface of the first door half portion. In the folded state of the door member, a stopper portion is provided that contacts the surface of the first door half portion and prevents the door member from rotating backward. By providing such a stopper portion, the rotation range of the door member can be restricted. Therefore, the operator who opens and closes the door member folded into two does not have to assume an unreasonable posture, and the door can be opened and closed more easily than before.

[0007] The stopper portion can be configured to extend in the lateral width direction and the obliquely upward direction on the depth side, and include an inclined surface that contacts the surface of the first door half of the lid member that has rotated toward the depth side around the first hinge mechanism. Also, in a state where the door member is folded into two, it is preferable that both ends of the front edge of the second door half are in contact with the upper end surface of the frame body respectively. When the stopper portion is configured in this way, the first door half of the door member folded into 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. Also, in a state where the first door half of the door member folded into two is in contact with the stopper portion, the second door half and the gripping portion face the front side of the tank body, and moreover, since both ends of the front edge of the second door half are in contact with the upper end surface of the frame body respectively, by the operator gripping the gripping portion and pulling it forward, without lifting the gripping portion, the first door half rotates in a direction toward the opening around the first hinge mechanism and the second door half rotates in a direction linearly aligned with the first door half around the second hinge mechanism while being supported by the upper end surface of the frame body, and finally assumes a posture that closes the opening of the frame body. As a result, the door member 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, it is possible to reliably prevent the door member folded into two from falling forward, and moreover, it is possible to make the operation when the operator grips and pulls the gripping portion easier.

[0009] The stopper portion may be configured by bending a metal plate so that its longitudinal cross-sectional shape forms a triangle. When using a stopper portion with such a structure, a sturdy stopper portion can be made at low cost, and the stopper portion can also be easily fixed to the fixed closing portion.

[0010] The first door half and the second door half are each integrally formed by bending first and second metal plates. In this case, it is preferable that first and second bent portions that are formed by subjecting the first and second metal plates to bending processes and that extend in the lateral direction are provided at the front edge portion of the first door half adjacent to the second hinge mechanism and at the rear edge portion of the second door half adjacent to the second hinge mechanism, respectively. When the first door half and the second door half are each integrally formed by bending first and second metal plates, when the size of the door member increases, the first and second door halves are likely to be deformed when the door member is opened. Therefore, when first and second bent portions that extend in the lateral direction are provided at the front edge portion of the first door half adjacent to the second hinge mechanism and at the rear edge portion of the second door half adjacent to the second hinge mechanism by subjecting the first and second metal plates to bending processes, respectively, since the first and second bent portions serve as reinforcing structure portions of the metal plates, it is possible to easily prevent the first and second door halves from being deformed when the door member is opened.

[0011] Further, when the first and second door halves are each formed by processing first and second metal plates, the grip portion may be formed by bending a second side portion of the metal plate that is located on the side opposite to the first side portion of the metal plate to which the second hinge mechanism is attached. When such a grip portion is used, since the grip portion can be formed only by bending and attached to the door member, the number of parts and the number of processing steps can be reduced. Also, the grip portion also serves as a reinforcing structure portion that reinforces the second door member made of a metal plate.

[0012] The grip portion preferably has a structure in which a rising portion that rises from the surface portion of the second door half and an opposing portion that extends in a direction intersecting the rising portion and opposes the surface portion of the second door half are integrated. And in this case, the length of the grip portion in the lateral direction has a length such that, in a state where the first door half is in contact with the stopper portion, the base portion of the rising portion constitutes the front edge portion and abuts against the upper end surface of the frame body. When the grip portion is configured in this way, not only does the grip portion become a reinforcing portion that increases the mechanical strength of the second door half, but the grip portion can be easily and robustly configured only by processing the plate material.

[0013] In a portion adjacent to the second hinge mechanism of the second door half, an auxiliary gripping portion that is gripped manually when raising the second door half upward may be provided. When the size of the lid member increases, by gripping the gripping portion with one hand of the operator and gripping the auxiliary gripping portion with the other hand, the door member can be opened and closed in a two-point gripping posture, and the lid member can be opened and closed without increasing the burden on the operator.

[0014] Note that the auxiliary gripping portion may be provided integrally with the second bent portion. By doing so, not only is it unnecessary to prepare the auxiliary gripping portion as a separate part, but also it is unnecessary to perform an operation for attaching the auxiliary gripping portion.

[0015] The present invention can also be understood as a method for manufacturing a resin molding material tank. In the manufacturing method, the first door half and the second door half are integrally formed by bending the first and second metal plates, respectively, and the gripping portion is formed by performing a bending process on one edge of the second metal plate. Further, the first and second bent portions extending in the lateral width direction may be formed by performing a bending process on the first and second metal plates 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.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the resin molding material tank and its manufacturing method according to the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 are perspective views when the opening and closing states of the lid member of the resin molding material tank according to the first embodiment of the present invention are changed. Also, FIGS. 6(A) to (D) are diagrams used to explain the deformed states during the opening and closing operations of the lid member.

[0018] The resin molding material tank 1 of the first embodiment includes a tank main body 3 and a lid member 5. The tank main body 3 includes a metal main body portion 31 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 four leg portions 32 that support the main body portion 31. The main body portion 31 and the leg portions 32 are each composed of a plurality of parts formed by subjecting a metal plate such as a stainless steel plate to machining such as cutting and bending, and a discharge structure portion (not shown) attached to the bottom wall portion 31A for discharging the resin material are joined together. Although not shown in the figure, in order to attach a discharge structure portion not shown, the bottom wall portion 31A has a shape that converges toward the center like a pyramid, and a discharge structure portion not shown is attached to the central portion thereof. Note that the structure of the bottom wall portion 31A and the structure of the discharge structure portion are arbitrary.

[0019] The main body portion 31 of the tank main body 3 includes four side wall portions 31B to 31E that rise from the four sides of the bottom wall portion 31A. As shown in FIG. 5, viewing window portions 33 in which transparent plates 34 are fitted are provided in the four side wall portions 31B to 31E. Due to the presence of the viewing window portions 33, the remaining amount of the resin molding material can be visually confirmed without opening the lid member 5. The space surrounded by the four side wall portions 31B to 31E is a storage space 35 that stores the pellet-shaped resin molding material, and the upper region of the storage space 35 constitutes the upper opening 36 of the tank main body 3. The resin molding material tank of the present embodiment has a lateral width dimension of 50 cm or more and a depth dimension of 50 cm or more at the upper opening 36 of the main body portion 31 of the tank main body 3, and the total weight is about 30 kg or more. Incidentally, for a large one, there is also a tank main body of 85 cm × 85 cm.

[0020] A valve to which a transfer pipe for transferring the resin molding material to the resin molding machine is connected is attached to the bottom wall portion 31A of the main body portion 31. Note that 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 portion 31 of the tank main body 3. The lid member 5 used in the present embodiment is configured by joining or combining a plurality of parts formed by subjecting a metal plate such as a stainless steel plate to machining such as cutting and bending, similar to the main body portion 31 of the tank main body 3. The lid member 5 of the present embodiment has an opening 51 facing the upper opening 36 of the main body portion 31 of the tank main body 3, a frame body 52 that fits outside the upper opening 36 of the main body portion 31 of the tank main body 3, a fixed closing portion 53 that is fixed to the rear region in the depth direction of the frame body 52 and extends in the lateral width direction to close a part of the opening 51 of the frame body 52, and a door member 54. As shown in FIGS. 1 and 5, the door member 54 is attached to the front edge portion 53A of the fixed closing portion 53 via a first hinge mechanism 55 and has a foldable door structure that closes the remaining portion of the opening 51 of the frame body 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 portion 53.

[0022] The door member 54 includes a first door half 54A attached to the front edge 53A of the fixed closing portion 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 grip portion 54C integrally provided at the front edge 54Ba of the second door half 54B and extending in the lateral width direction. The first door half 54A is composed of a first metal plate. The second hinge mechanism 56 is composed of three hinge fittings 56A to 56C connecting between the first door half 54A and the second door half 54B. Also, the second door half 54B and the grip portion 54C are integrally formed by bending a second metal plate. The grip portion 54C is formed by bending the second side portion of the second door half 54B, which is located on the side opposite to the first side portion of the second door half 54B where the second hinge mechanism 56 is attached. By using such a grip portion 54C, the grip portion 54C can be configured and attached only by bending, so that the number of parts and the processing man-hours can be reduced. The grip portion 54C has a structure in which a rising portion 54Ca rising from the front edge 54Ba of the surface portion 54Bo [FIG. 6(A)] of the second door half 54B and an opposing portion 54Cb extending in a direction intersecting with the rising portion 54Ca and opposing the surface portion 54Bo of the second door half 54B are integrated. The length of the grip portion 54C in the lateral width direction has a length such that, in a state where the first door half 54A is in contact with a stopper portion 57 described later, the base portion of the rising portion 54Ca constitutes the front edge 54Ba and abuts against the upper end surface of the frame body 52. When the grip portion 54C is configured in this way, the grip portion 54C not only becomes a reinforcing portion that enhances the mechanical strength of the second door half 54B, but also the grip portion 54C can be simply and robustly configured only by processing the plate material.

[0023] As shown in FIGS. 1 and 2, in the fixed closing portion 53, with the first hinge mechanism 55 as the center, the first door half 54A is rotated rearward, and the second door half 54B is rotated around the second hinge mechanism 56 so as to approach the back surface of the first door half 54A. In the state where the door member 54 is folded, a stopper portion 57 is provided which contacts the surface of the first door half 54A of the door member 54 rotated in the depth direction around the first hinge mechanism 55 to prevent the door member 54 from rotating rearward. By providing the stopper portion 57, the rotation range of the door member 54 can be restricted, so that the operator who opens and closes the door member 54 folded into two can open and close the door more easily without being forced into an awkward posture.

[0024] The stopper portion 57 has a structure extending in the lateral width direction and the obliquely upward direction on the depth side, and includes an inclined surface 57A that contacts the surface of the first door half 54A of the door member 54 rotated in the depth direction around the first hinge mechanism 55. The stopper portion 57 is formed by bending a plate material so that its longitudinal cross-sectional shape is triangular. Using the stopper portion 57 having such a structure, a strong stopper portion can be made at low cost, and the stopper portion 57 can be easily fixed to the fixed closing portion 53.

[0025] In this embodiment, with the door member 54 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 body 52 respectively. When the stopper portion 57 is configured in this way, since the first door half 54A of the door member 54 folded in two can be supported by the entire inclined surface 57A of the stopper portion 57, deformation of the door member 54 can be prevented even when repeatedly opened and closed. Further, in a state where 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 gripping portion 54C face the front side of the tank body 3, and moreover, 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 body 52 respectively. Therefore, by the operator gripping the gripping portion 54C and pulling it forward, without lifting the gripping portion 54C, the first door half 54A rotates in a direction toward the opening 51 around the first hinge mechanism 55 and the second door half 54B rotates in a direction linearly aligned with the first door half 54A around the second hinge mechanism 56 while being supported by the upper end surface 52A of the frame body 52, and finally assumes a posture closing 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 research of the inventor, 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°. This inclination angle θ is preferably made smaller as the lateral dimension × depth dimension 50 cm × 50 cm of the upper opening 36 of the main body portion 31 of the tank body 3 becomes larger. Within this angle range, it is possible to surely prevent the door member 54 folded in two from falling forward, and moreover, the operation when the operator grips and pulls the gripping portion 54C can be made easier.

[0027] Figs. 7 to 10 are perspective views showing the structure of a second embodiment of the resin molding material tank and its manufacturing method according to the present invention. In Figs. 7 to 10, the same parts as those in the first embodiment shown in Figs. 1 to 6 are denoted by the same reference numerals as those in Figs. 1 to 6. When the first door half 54A and the second door half 54B are integrally formed by subjecting the first and second metal plates to metal working, when the size of the door member 54 increases, when opening the door member 54, the first and second door halves 54A and 54B are likely to deform. Therefore, as shown enlarged in Fig. 8, in the second embodiment, at the front edge portion 54Aa adjacent to the second hinge mechanism 56 of the first door half 54A and the rear edge portion 54Bc adjacent to the second hinge mechanism 56 of the second door half 54B, first and second bent portions 54Ab and 54Bd that are formed by subjecting the first and second metal plates to bending and extend in the lateral width direction are integrally provided. When the first and second bent portions 54Ab and 54Bd are provided, since the first and second bent portions 54Ab and 54Bd serve as reinforcing structure portions of the metal plates, as shown in Figs. 9 and 10, when opening the door member 54, deformation of the first and second door halves 54A and 54B can be prevented. The first and second bent portions 54Ab and 54Bd of the present embodiment are each constituted by 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°. Note that the length dimension in the inclined direction of the first and second bent portions 54Ab and 54Bd is about 10 mm.

[0028] Also, in a portion adjacent to the second hinge mechanism 56 of the second door half 54B, an auxiliary gripping portion 58 that is gripped manually when raising the second door half 54B upward is provided. When the size of the lid member becomes large, by gripping the gripping portion 54C with one hand of the operator and gripping the auxiliary gripping portion 58 with the other hand, the door member 54 can be opened and closed in a two-point gripping posture. In the present embodiment, as shown in FIG. 8, the height dimension of the central portion 54Be in the lateral width direction of the second bent portion 54Bd is larger than the height dimensions of other portions. And in this central portion 54Be, a circular through-hole 54Bf penetrating the central portion 54Be in the thickness direction is formed, and the auxiliary gripping portion 58 is configured. Therefore, according to the present embodiment, there is an advantage that it is not necessary to prepare the auxiliary gripping portion 58 as a separate part, and there is also no need for an operation for attaching the auxiliary gripping portion 58. Incidentally, when the lateral width dimension × depth dimension of the upper opening 36 of the main body portion 31 of the tank main body 3 is 85 cm × 85 cm, the dimensions of the auxiliary gripping portion 58 are 160 mm to 180 mm in the lateral 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. Further, the shape of the through-hole 54Bf is not limited to a circular shape.

[0029] In the above first and second embodiments, the longitudinal cross-sectional shape of the stopper portion 57 is triangular, but of course, the longitudinal cross-sectional shape of the stopper portion may be other shapes.

[0030] In the above first and second embodiments, the longitudinal cross-sectional shape of the gripping portion 54C is an inverted L shape, but this longitudinal cross-sectional shape is arbitrary as long as the fingers of the operator can be locked.

[0031] In the above 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, by providing the stopper portion, the rotation range of the door member can be restricted. Therefore, an operator who opens and closes the door member folded in two can open and close the door more easily than before without being forced into an uncomfortable posture.

Explanation of Signs

[0033] 1 Resin molding material tank 3 Tank body 31 Main body portion 31A Bottom wall portion 31B to 31E Side wall portions 32 Leg portion 33 Peep window portion 35 Storage space 36 Upper opening 5 Lid member 51 Opening 52 Frame body 52A Upper end surface 53 Fixed closing portion 53A Front edge 54 Door member 54A First door half 54B Second door half 54C Gripping portion 55 First hinge mechanism 56 Second hinge mechanism 57 Stopper portion 57A Inclined surface 58 Auxiliary gripping portion

Claims

1. A resin molding material tank comprising a metal tank body filled with a resin material supplied to a resin molding machine through an upper opening and storing the resin material therein, and a removable metal lid member closing the upper opening of the tank body, wherein the resin molding material tank has a width dimension of the upper opening of the tank body of 50 cm or more and a depth dimension of 50 cm or more, and the lid member includes a frame body having an opening facing the upper opening of the tank body and fitted outside or inside the upper opening of the tank body, a fixed closing portion fixed to a rear region in the depth direction of the frame body and extending in the width direction to close a part of the opening of the frame body, a folding door member attached to a front edge portion of the fixed closing portion via a first hinge mechanism to close the remaining part of the opening of the frame body, 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 gripping portion provided at a front edge portion of the second door half and extending in the width direction, the fixed closing portion is provided with a stopper portion that contacts the surface of the first door half and prevents the door member from rotating rearward in a state where the first door half is rotated rearward about the first hinge mechanism and the second door half is rotated about the second hinge mechanism so as to approach the back surface of the first door half, and the door member is folded into two. A resin molding material tank characterized by that.

2. The stopper portion includes an inclined surface extending in an obliquely upward direction in the width direction and the depth side and contacting the surface of the first door half rotated in the depth side about the first hinge mechanism, The resin molding material tank according to claim 1, wherein both end portions of the front edge portion of the second door half are in contact with the upper end surface of the frame body in a state where the door member is folded into two.

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

4. The resin molding material tank according to claim 3, wherein the stopper portion is configured by bending a metal plate so that a longitudinal cross-sectional shape forms a triangle.

5. The first door half and the second door half are integrally formed by bending first and second metal plates, respectively. At the front edge of the first door half adjacent to the second hinge mechanism and the rear edge of the second door half adjacent to the second hinge mechanism, first and second bent portions are provided which are formed by bending the first and second metal plates and extend in the lateral width direction. The resin molding material tank according to claim 1.

6. The first door half and the second door half are integrally formed by machining the first and second metal plates respectively. The gripping portion is at the front edge of the second door half and is formed by bending the second metal plate. The resin molding material tank according to claim 1.

7. The gripping portion has a structure in which a rising portion rising from the edge of 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. The length of the gripping portion in the lateral width direction has a length such that, in a state where the first door half is in contact with the stopper portion, the base of the rising portion constitutes the front edge and abuts against the frame body. The resin molding material tank according to claim 5.

8. At a portion of the second door half adjacent to the second hinge mechanism, an auxiliary gripping portion is provided which is gripped by an operator when the second door half is lifted upward. The resin molding material tank according to claim 1.

9. At a portion of the second door half adjacent to the second hinge mechanism, an auxiliary gripping portion is provided which is gripped by an operator when the second door half is lifted upward. The auxiliary gripping portion is provided integrally with the second bent portion. The resin molding material tank according to claim 5.

10. A metal tank body for storing a resin material filled from an upper opening and storing the resin material therein, and a removable metal lid member for closing the upper opening of the tank body, wherein the lateral width dimension of the upper opening of the tank body is 50 cm or more and the depth dimension is 50 cm or more. The lid member is a frame body having an opening facing the upper opening of the tank body and fitting outside or inside the upper opening of the tank body. a fixed closing portion fixed to the rear region in the depth direction of the frame body and extending in the lateral width direction to close a part 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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