JP2016033022A - Flexible container bag having double structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible container bag having a double structure, which can minimize contamination while an inner bag and an outer bag are fixed by sewing or other means in both an injection cylinder and a discharge cylinder, and can be folded easily and compactly.SOLUTION: A flexible container bag 1 having a double structure comprises an outer bag 2 and an inner bag 3. The outer bag 2 comprises an outer bag body 10, an outside injection cylinder 30, and an outside discharge cylinder 40. The inner bag 3 comprises an inner bag body 3a disposed inside the outer bag body 10 for accommodating granules, an inside injection cylinder 3b disposed inside the outside injection cylinder 30, and an inside discharge cylinder 3c disposed inside the outside discharge cylinder 40. The inside injection cylinder 3b and the outside injection cylinder 30 are fixed to each other at the tip parts, and the inside discharge cylinder 3c and the outside discharge cylinder 40 are fixed to each other at the tip parts. Air vent holes 32, 42 for allowing discharge of air in an area A between the inner bag 3 and the outer bag 2 are formed in at least one of the outside injection cylinder 30 and the outside discharge cylinder 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexible container bag used for storing, transporting, and discharging a granular material, and more particularly to a flexible container bag having a double structure of an inner bag and an outer bag.

  A flexible container bag having a double structure of an inner bag and an outer bag has been proposed for a long time (Patent Document 1). In this double-structure flexible container bag, the outer bag is made of a woven cloth such as a synthetic resin cloth, and the inner surface is coated or laminated with a resin as desired. Since this outer bag made of woven fabric lacks moisture resistance, a synthetic resin film bag is used as the inner bag in this double-structure flexible container bag in order to supplement the moisture resistance of the outer bag.

  In Patent Document 1, it has been proposed to heat-seal and stitch the inner and outer bags. However, as far as the applicant knows, even after the proposal of the double-structure flexible container bag according to Patent Document 1, It was rather normal to use the outer bag without being fixed to each other.

  In a double-structured flexible container bag, lint, work tools, dust, insects, or other foreign objects are mixed in between the outer bag and the inner bag, or a part of the inner side of the outer bag material is torn off. Between the outer bag and the inner bag, and when the foreign material discharges or discharges the granular material (raw material or product), the outer discharge tube (outer bag discharge tube) and the inner discharge tube (inner In order to avoid this contamination, the outer bag may be contaminated by being discharged or released together with the powder from the gap between the bag and the discharge tube). It has been proposed to sew the discharge tube and the discharge tube of the inner bag (Patent Document 2).

  In addition, when the inner bag slips from the outer bag when the outer bag injecting cylinder (the charging cylinder or the filling cylinder) and the inner bag (the charging cylinder or the charging cylinder) are not fixed to each other, In order to avoid the possibility that foreign matter that has entered between and discharged together with the powder particles will cause contamination that contaminates the powder particles, the upper end of the inner bag injection tube (inner injection tube) is folded back outward Patent Document 2 also proposes fixing (sewing) to the outer surface of the bag injection tube (outer injection tube).

  In addition, in the flexible container bag having a double structure of the inner bag and the outer bag, there are other proposals for sewing the upper and lower ports to each other (Patent Document 3 and Patent Document 4).

  However, in order to avoid the occurrence of the above-described contamination problem in the flexible container bag having a double structure of the inner bag and the outer bag, the inventor of the outer bag and the inner bag discharge tubes (outer and inner discharge tubes). When the tips of the outer and inner pouches (outer and inner pouches) were sewn together, the double-layer flexible container bag product itself was literally flexible in terms of material. In spite of allowing the material to be compactly folded, the flexible container bag having the double structure is in the form of granular material in the state where the tip of the injection tube and the discharge tube of the outer bag and the inner bag is stitched. Even if you try to fold it without the air inside, the air that has entered the area between the inner bag and the outer bag is not easily removed. The folding was found to be difficult to do in practice. Therefore, in such a state, it was found that an excessive space is required for storing, storing and transporting the double-structure flexible container bag product itself, and it has been found that the merit of the flexible material cannot be fully utilized. .

Japanese Utility Model Publication No. 61-12381 Japanese Patent Laid-Open No. 2005-22736 Microfilm of Japanese Utility Model Application No. 1-107464 (Japanese Utility Model Application Publication No. 3-45896) JP-A-6-286790

  The present invention has been made in view of the above points, and its object is to minimize the possibility of contamination because the inner bag and the outer bag are fixed by stitching or the like in both the injection tube and the discharge tube. An object of the present invention is to provide a flexible double-structured container bag that can be easily folded compactly.

  In order to achieve the above object, the double-structure flexible container bag of the present invention comprises an outer bag and an inner bag accommodated in the outer bag, and the outer bag has an outer bag body, and the outer bag body. An outer injection cylinder connected to one end and having a smaller diameter than the outer bag main body, and an outer discharge cylinder connected to the other end of the outer bag main body and having a smaller diameter than the outer bag main body, the inner bag being disposed in the outer bag main body An inner bag main body for containing particles, an inner injection tube connected to one end of the inner bag main body and having a smaller diameter than the inner bag main body and disposed in the outer injection tube, and an inner bag main body connected to the other end of the inner bag main body An inner discharge tube having a smaller diameter and disposed in the outer discharge tube, the inner injection tube and the outer injection tube are fixed to each other at the tip, and the inner discharge tube and the outer discharge tube are fixed to each other at the tip. A region between the inner bag and the outer bag on at least one of the outer injection tube and the outer discharge tube Vent hole to allow the discharge of air is formed.

  In the flexible container bag having a double structure according to the present invention, “the inner injection tube and the outer injection tube are fixed to each other at the tip portion, and the inner discharge tube and the outer discharge tube are fixed to each other at the tip portion”. In addition to minimizing the risk of contamination of the powder particles that are contained in the flexible container bag, transported and discharged (raw materials and products), the flexible container having the double structure of the present invention In the bag, in particular, “at least one of the outer injection tube and the outer discharge tube is formed with an air vent hole that allows discharge of air in the region between the inner bag and the outer bag”. Double structure with the inner bag inside the outer bag, "the inner injection cylinder and the outer injection cylinder are fixed to each other at the tip, and the inner discharge cylinder and the outer discharge cylinder are fixed to each other at the tip" Flexible When folding the container bag, the air in the region between the inner bag and outer bag, because can be released through the air hole, flexible intermediate bulk container having a double structure can easily be folded compactly.

  Here, since the air vent hole is formed in “at least one of the outer injection cylinder and the outer discharge cylinder”, a foreign object is formed through the air vent hole even though there is a hole (opening). The possibility that contamination will occur due to, for example, entering and exiting can be minimized. That is, for example, when the tip of the outer and inner discharge cylinders are merely partially stitched without being folded back (when the opening is at the tip), the foreign matter falls through the non-stitched portion. Although there is a possibility of causing contamination, the fear can be avoided in the double-structure flexible container bag of the present invention.

  In addition, the “air vent hole” in the double-structure flexible container bag of the present invention is formed in the double-structure flexible container bag (actually the inner bag from the folded state by drawing air between the outer bag and the inner bag). If the outer bag and the inner bag have a slightly different three-dimensional shape due to differences in material rigidity or design three-dimensional shape, etc. It may also serve to allow some air to easily enter between the bag and the inner bag.

  In the double-structure flexible container bag of the present invention, typically, a plurality of air vent holes are formed at intervals in the circumferential direction of the at least one cylinder.

  In that case, each air vent hole can be made relatively small, and the risk of contamination due to the entry and exit of foreign matter through the air vent hole can be minimized.

  In the double-structure flexible container bag of the present invention, typically, the outer bag is a split portion that extends from the end portion on the outer bag main body side of the at least one tube of the outer bag, and at the tip portion. A bundling rope is provided, and the split portion is configured to cover the air vent hole.

  In this case, since the air vent hole can be covered with the split part, the possibility of contamination due to the entry and exit of foreign matter through the air vent hole can be minimized.

  In the flexible container bag having a double structure according to the present invention, when the split portion is provided, typically, an air vent hole is formed between the distal end portion of the at least one of the outer injection tube and the outer discharge tube. It is formed in a region near the base end portion of the base end portion on the outer bag main body side of the at least one cylinder.

  In that case, the air vent hole is easily reliably covered by the split part.

  In the double-structure flexible container bag of the present invention, typically, the tip of the corresponding tube of the inner bag positioned overlapping the at least one tube of the outer bag is the tip of the at least one tube of the outer bag. It protrudes beyond the portion and is folded and stitched on the tip of the at least one tube of the outer bag.

  In that case, the possibility of occurrence of contamination of the granular material caused by the entry and exit of the foreign matter into and out of the region between the inner bag and the outer bag can be minimized.

  In the dual-structure flexible container bag of the present invention, typically, air vent holes are formed in both the outer injection tube and the outer discharge tube.

  In that case, since air in the region between the inner bag and the outer bag is easily released during folding, compact folding can be easily performed.

Explanatory drawing which showed the flexible container bag of the double structure of one preferable Example of this invention (each was seen diagonally from the opening side of a pipe | tube front-end | tip so that the structure of the injection | pouring pipe | tube side and the discharge pipe | tube side may be understood easily. (Shown in perspective view) FIG. 2 is a perspective explanatory view showing the upper portion of the double-structure flexible container bag of FIG. 1 in a state where the injection cylinder rope is loosened and the chrysanthemum part is dropped (however, the hanging belt and the like are not shown). Plane explanatory drawing of the inner bag of the flexible container bag of the double structure of FIG. Explanatory drawing which showed the state which formed the air vent hole in the woven fabric which comprises the injection | pouring cylinder of the outer bag of the flexible container bag of the double structure of FIG. FIG. 2 is a schematic cross-sectional explanatory diagram for explaining the function of an air vent hole in the double-structure flexible container bag of FIG. 1 (the inner bag and the outer bag are shown somewhat apart for the sake of clarity).

  A preferred embodiment of the present invention will be described based on a preferred embodiment shown in the accompanying drawings.

  As can be seen from the explanatory view shown in FIG. 1 and the schematic cross-sectional explanatory view shown in FIG. And a flexible inner bag 3.

  The outer bag 2 has an outer bag body 10, an outer injection tube 30, and an outer discharge tube 40. The outer bag 2 is made of, for example, a woven fabric of flat yarn having a width of about several mm. The outer bag body 10 is made of, for example, a woven cloth made of polypropylene having a high mechanical strength, and the outer injection cylinder 30 and the outer discharge cylinder 40 are made of a highly flexible polyethylene woven cloth. The inner surface of the outer bag 2 may be coated or laminated with a resin in the form of a thin layer of about several tens of microns, for example.

  The outer bag main body 10 includes a large-diameter cylindrical portion 11, an annular upper surface portion or top surface portion 13 sewn to the circular upper edge portion of the large-diameter cylindrical portion 11, and a large-diameter cylindrical portion 11. An annular lower surface portion or bottom surface portion 16 sewn to the circular lower edge portion at the outer peripheral edge.

  On the inner peripheral side of the upper surface portion 13, four pieces of flap-shaped split portions 15 are formed so as to define the upper surface side opening 14, and on the inner peripheral edge side of the bottom surface portion 16, the bottom surface side opening 17 is formed. Four pieces of flap-shaped chrysanthemum part 18 are formed as prescribed. Inner valves 12 and 19 having a length substantially crossing the openings 14 and 17 are respectively provided on the inner surfaces of one of the upper and lower flap-like split portions 15 and 18. It is sewn with. A rope insertion hole 21 is formed at the tip of the upper flap-shaped split portion 15, and an injection tube rope 22 as a binding rope is inserted into the hole 21. Both end portions 22a and 22b of the injection tube rope 22 are inserted into the pipe 23 and connected to each other. Similarly, a rope insertion hole 24 is formed at the tip of the lower flap-shaped split portion 18, and a discharge cylinder rope 25 as a binding rope is inserted into the hole 24. Both end portions 25a and 25b of the discharge cylinder rope 25 are inserted into the pipe 26 and connected to each other. Accordingly, the both ends 22a and 22b of the injection tube rope 22 and the both ends 25a and 25b of the discharge tube rope 25 are pulled and pulled out from the pipes 23 and 26 with respect to the pipes 23 and 26, whereby the injection tube rope 22 and the discharge tube rope. 25, the upper and lower inner valves 12, 19 are expanded so as to substantially close the respective openings 14, 17, and the upper and lower flap-shaped split portions 15 and 18 are closed. And 18 can be brought close together.

  The outer injection cylinder, that is, the outer injection cylinder or the outer filling cylinder 30 is sewn to the inner surface side of the peripheral edge portion 13 a of the opening 14 of the upper surface portion 13 at the lower end portion or the base end portion 31. In the vicinity of the base end portion 31 of the outer injection cylinder 30, an opening 32 that functions as an air vent hole is formed at intervals in the circumferential direction. In this example, the air holes, that is, the air vent holes 32 are round holes, and four air holes are formed at intervals in the circumferential direction. Therefore, when the injection cylinder rope 22 is tightened, the split portion 15 can cover the air hole 32 outside the outer injection cylinder 30. The number and shape of the air holes 32 may be different.

  For example, as shown in FIG. 4, the outer injection tube 30 is formed with four openings 32 at equal intervals in the longitudinal direction of the rectangular outer injection tube woven fabric 33, and the longitudinal direction of the injection tube woven fabric 33. Is formed by stitching both ends 33a and 33b into a cylinder 30.

  The outer discharge tube 40 is the same as the outer injection tube 30. That is, the outer discharge tube 40 is sewn to the inner surface side of the peripheral edge portion 16 a of the opening 17 of the bottom surface portion 16 at the upper end portion or the base end portion 41. In the vicinity of the base end portion 41 of the outer discharge cylinder 40, an opening 42 is formed that acts as an air vent hole at intervals in the circumferential direction. In this example, the air holes, that is, the air vent holes 42 are round holes, and four air holes are formed at intervals in the circumferential direction. Therefore, the split portion 18 can cover the air hole 42 outside the outer discharge tube 40. The number and shape of the air holes 32 may be different. Similarly to the outer injection tube 30, the outer discharge tube 40 is also formed with four openings 42 at equal intervals in the longitudinal direction of the rectangular discharge tube woven fabric 43, and the longitudinal direction of the discharge tube woven fabric 43 is arranged at both ends 43 a, It is formed by sewing 43b into a cylinder 40.

  The outer injection cylinder 30 and the outer discharge cylinder 40 are attached with ties 34 and 44 which are bound to close the cylinders 30 and 40 with the cylinders 30 and 40 being squeezed.

  Suspension belts 51 and 52 used for lifting the bag 1 are reinforcing webbings 53 and 53 (not shown) at intermediate portions 51a and 51b (not shown) and 52a and 52b (not shown). ) And 54, 54 (not shown), and is sewn to the large-diameter cylindrical portion 11 of the outer bag main body 10, and the bottom portion 16 of the outer bag main body 10 at each of the end portions 51 c, 51 d and 52 c, 52 d. Is sewn via a bottom rope 55. A card case 56 in which an information card for specifying the content of the granular material is attached to the suspension belt 52 through a suspension string 56a.

  In addition to the suspension belts 51, 52, hook receivers 57 that allow the bag 1 to be lifted by hook-like lifting tools are sewn together with the intermediate portions of the suspension belts 51, 52 at each force cloth 54. .

  Here, as for the size of the outer bag 2 so that the relative size with the inner bag 3 described later can be easily understood, for example, the diameter D1 of the outer bag body 10 is 100 cm, the height L1 is 50 cm, and the outer injection is performed. The diameter D2 of the cylinder 30 is 40 cm and the length L2 is 40 cm, the diameter D3 of the outer discharge cylinder 40 is 40 cm, and the length L3 is 40 cm. The diameter D9 of the air holes 32 and 42 is 2 cm, for example.

  Of course, the length of the outer bag 2 is not as short as 50 cm, but may be about 100 cm, or may be about 150 cm or longer. Moreover, the diameter D1 of the outer bag main body 10 may be larger or smaller. The ratio between the length L1 and the diameter D1 of the outer bag body 10 is usually larger but may be smaller depending on the case. The diameters D2 and D3 of the outer injection cylinder 30 and the outer discharge cylinder 40 may be smaller or larger. The ratios D2 / D1, D3 / D1 of the diameters D2, D3 of the outer injection cylinder 30 and the outer discharge cylinder 40 to the diameter D1 of the outer bag body 10 may be smaller or larger. The lengths L2 and L3 of the outer injection tube 30 and the outer discharge tube 40 may be larger or smaller. Further, the lengths L2 and L3 and the diameters D2 and D3 of the outer injection tube 30 and the outer discharge tube 40 may be different from each other.

  The inner bag 3 has, for example, a folded shape G as shown in FIG. FIG. 3 shows a planar shape G in a state where the inner bag 3 is folded in half, and has an elongated hexagonal shape. The inner bag 3 of the hexagonal folded shape G is, for example, a polyethylene film F2 having a length of L4 and a width of 2W1, which is folded in the width direction at the intermediate portion so that the folding width becomes W1, and the longitudinal direction Is cut diagonally so that the vertically extending portions 61 and 62 having the length L5 remain in the central portion of the horizontal portion and the horizontal or lateral extending portions 63 and 64 having the lengths W2 and W3 remain in the central portion in the width direction. At the same time, heat sealing is performed along the cut portions to form upper diagonally extending portions 65 and 66 and lower diagonally extending portions 67 and 68 having lengths L6 and L7. A reinforcing tape 69 is attached to the tip side portions of the upper and lower diagonally extending portions 65, 66 and 67, 68.

  The vertically extending portion 62 that is folded and overlapped is also heat-sealed along the extending portion 62. Accordingly, the inner bag 3 of the hexagonal folded shape G is closed except for the horizontal extending portions 63 and 64 and has a cylindrical shape as a whole, and the horizontal extending portions 63 and 64 are formed in the inner bag 3. The upper and lower openings 71 and 72 of the inner cylinder constituting the cylinder are defined.

  Speaking of the size of the inner bag 3 in the case where the outer bag 2 has a size as illustrated, for example, when the outer bag 2 has an elongated hexagonal shape that can be folded in two as shown in FIG. 3, for example, the width W1 is 190 cm, W2 and W3 are each 65 cm, length L5 is 60 cm, and lengths L6 and L7 are each 90 cm.

  That is, 2W1 / π to 120 cm >> D1 = 100 cm, and when the thick portion 73 of the inner bag 3 is cylindrical, the diameter 2W1 / π of the large-diameter cylindrical portion 73 is that of the outer bag body 10. It is somewhat larger than the diameter D1 of the large-diameter cylindrical portion 11, and can be supported in contact with the large-diameter cylindrical portion 11 of the outer bag 2 with a margin when the granular material is accommodated.

  Further, 2W2 / π to 41.4 cm> D2 = 40 cm, and the thinnest portion consisting of the horizontal extending portion 63 defining the opening 71 at the upper end of the inner bag 3, that is, the uppermost detail 74 is cylindrical. The diameter 2W2 / π in this case is approximately the same as the diameter D2 of the outer injection cylinder 30 and is slightly larger than the diameter D2, and the planar shape of the inner bag 3 is the trapezoid J1 in the shape of the entrance side tapered cylindrical portion 75. Of these, the upper diameter portion 75a adjacent to the upper end most detail 74 and thicker than the uppermost detail portion 75a has a diameter larger than the diameter D2 of the outer injection tube 30 when the portion 75a is cylindrical. The narrowest portion of the horizontally extending portion 64 that defines the opening 72 at the lower end of the inner bag 3, that is, the lowermost detail 76 is approximately the same as the diameter D3 of the outer bag discharge tube 40 and larger than the diameter D3. , And the inner bag 3 has a planer shape J2 (in this example, the shape is the same as that of the trapezoid J1 and the direction is opposite). Similarly, the diameter of the tapered tubular lower portion 77a when the portion 77a is cylindrical is somewhat larger than the diameter D3 of the outer bag discharge tube 40. Therefore, there is no fear that the effective diameters of the outer injection cylinder 30 and the outer bag discharge cylinder 40 are small due to the presence of the entry-side tapered tubular portion upper portion 75a and the exit-side tapered tubular portion lower portion 77a of the inner bag 3, and Injection and draining (release) may be possible.

  Further, L5 = 60 cm> L1 = 50 cm, and the length (height) L5 of the large-diameter cylindrical portion 73 of the inner bag 3 is the length (high) of the outer bag main body 10 (the large-diameter cylindrical portion 11). I) Greater than L1.

Of the entrance-side and exit-side tapered cylindrical portions 75, 77 in which the planar shape of the inner bag 3 is trapezoidal J1, J2, for example, the length of the upper diagonally extending portions 65, 66 of the entrance-side tapered tubular portion 75 Speaking of L6, L6 = 90 cm >> {(D1-D2) / 2} + L2 = {(100-40) / 2} + 40 = 70 cm, and the upper diagonally extending portion 65 of the inner bag 3, 66 along the outer bag 2 from the outermost peripheral edge of the top surface portion 13 of the outer bag 2 to the inner peripheral edge (the edge of the opening 14 and the base end 31 of the outer injection cylinder 30). As long as it is along the outer injection cylinder 30, the upper end most detail 72 of the inner bag 3 is a length that can greatly protrude from the injection cylinder 30 of the outer bag 2. On the other hand, the height or length L8 of the trapezoidal J1 constituting the inlet side tapered cylindrical portion 75 of the inner bag 3 is, in this ^{example, {L6 2 - (W1-} W2) 2/4} 1/2 ~64 Since L8 to 64.8 cm <70 cm, the central minimum height portion 75c corresponding to the height of the trapezoid J1 of the entrance side tapered cylindrical portion 75 of the inner bag 3 is outside in the outer bag 2. Trying to run along the outer injection cylinder 30 from the outermost peripheral edge of the top surface portion 13 of the bag 2 to the inner peripheral edge (the edge of the opening 14 and the proximal end 31 of the outer injection cylinder 30) and from the proximal end 31 to the distal end. The inner bag 3 is a region facing the vicinity of the outer peripheral edge of the top surface portion 13 of the outer bag 2 in at least the lower portion of the entry-side tapered tubular portion 75, that is, the entry-side tapered tubular portion lower portion 75b. In this case, a position away from the top surface portion 13 is taken (however, the inner bag 3 Since diameter cylindrical portion 73 is sufficiently longer than the cylindrical portion 11 of the outer bag 2, in fact, it may avoid able remarkable clearance between the inner bag 3 and the outer bag 2). Further, in the region between the minimum height portion 75c at the center when viewed in the circumferential direction and the diagonally extending portions 65 and 66 on both sides of the entrance-side tapered cylindrical portion 75, the gap gradually becomes small. In this region, the top surface portion 13 of the outer bag 2 and the injection tube 30 can be actually along.

  In addition, when adopting the shape which becomes a plane when the inner bag 3 is folded in two, if the inclination at the upper edge or the lower edge of the diagonally extending portions 65, 66 that becomes the maximum length is determined, the diagonal When the direction extending portions 65 and 66 are straight lines, the length is minimized, and the difference Δ = L6−L8 between the oblique direction extending portions 65 and 66 and the central minimum height portion 75c is minimized. Therefore, when the inner bag 3 is folded in two and takes a planar shape, the diagonally extending portions 65 and 66 are preferably linear. However, if desired, the diagonally extending portions 65 and 66 may be in a non-linear shape protruding outward or inward. On the one hand, the inclination of the diagonally extending portions 65 and 66 avoids an excessively large difference Δ, and on the other hand, the size of the opening 71 of the uppermost end detail 74 of the entrance side tapered cylindrical portion 75 and the outer injection cylinder. It can be selected as desired so that the difference from the size of 30 does not become too large.

  In the above description, it is assumed that the upper end 73a of the large-diameter cylindrical portion 73 of the inner bag 3 is aligned with the upper end 11a of the large-diameter cylindrical portion 11 of the outer bag 2. 3 is sufficiently longer than the large-diameter cylindrical portion 11 of the outer bag 2, for example, a portion about 5 cm below the upper end 73 a of the large-diameter cylindrical portion 73 of the inner bag 3 is the outer bag. 2 is arranged so as to coincide with the upper end 11a of the large-diameter cylindrical portion 11, the inner bag 3 is actually attached to the top surface portion 13 of the outer bag 2 and the outer injection cylinder 30 at the central minimum height portion 75c. You can do it along the top. In addition, the description about the entrance side tapered cylindrical part 75 in the above is applied as it is about the exit side tapered cylindrical part 77 as it is in practice.

  That is, in this example (L2 = L3, D1 = D3), the total length L4 passing through the minimum height portion 75c of the inner bag 3 is L4 = L5 + 2 * L8 = 60 + 2 × 64.8 = 189.6 cm. 2 effective length L1 + 2 {L2 + (D1-D2) / 2} = 190 cm, which is practically the same (however, here, the length of the folded portion of the inner bag 3 described later is short enough to be ignored) It is assumed that the case where the length of the folded portion is sufficiently expected will be described later). Therefore, also in this example, the inner bag 3 can be arranged so as to actually follow the outer bag 2.

  It should be noted that the relationship between the entrance side tapered tubular portion 75 and the outer injection tube 30 and the relationship between the exit side tapered tubular portion 77 and the outer bag discharge tube 40 are such that gravity flows in the flow direction of the granular material and the granular material. Since this direction is the reverse direction, the shape of the outlet side tapered cylindrical portion 77 may be slightly different from the shape of the inlet side tapered cylindrical portion 75 in consideration of the difference.

  A portion of the inner bag 3 that actually faces the main body 10 of the outer bag 2 is called an inner bag main body 3a, and a portion of the inner bag 3 that faces the injection cylinder 30 of the outer bag 2, that is, the outer injection cylinder 30 is actually an inner injection cylinder. If the portion of the inner bag 3 that faces the discharge tube 40 of the outer bag 2, that is, the outer discharge tube 40, is actually referred to as the inner discharge tube 3c, the inner bag body 3a is roughly larger than the inner bag 3. It consists of a diameter cylindrical portion 73, an inlet side tapered cylindrical portion lower portion 75b, and an outlet side tapered cylindrical portion upper portion 77b, and the inner injection tube 3b consists of an inlet side tapered cylindrical portion upper portion 75a of the inner bag 3, The discharge cylinder 3c is composed of the outlet side tapered cylindrical lower portion 77a of the inner bag 3. However, the boundary between the entry-side tapered tubular portion upper portion 75a and the lower portion 75b is not clear, and even if the lower portion of the entry-side tapered tubular portion upper portion 75a belongs to the inner bag body 3a, The upper part of the entry side tapered cylindrical part lower part 75b may belong to the inner injection cylinder 3b. Similarly, the boundary between the output side tapered cylindrical part upper part 77b and the lower part 77a is not clear. Even if the upper part of the outlet side tapered cylindrical part lower part 77a belongs to the inner bag body 3a, the lower part of the outlet side tapered cylindrical part upper part 77b belongs to the inner discharge cylinder 3c. Also good. In the following, for the sake of simplicity of explanation, the portion facing the outer injection tube 30 in the entry-side tapered tubular portion 75 is referred to as the entry-side tapered tubular portion upper portion 75a, and the portion facing the outer bag body 10 is designated as the entry side. A portion that faces the outer bag discharge cylinder 40 in the outlet-side tapered tubular portion 77 is called an outlet-side tapered tubular portion lower portion 77a, and a portion that faces the outer bag main body 10 is called an outlet-side tapered portion. This is referred to as a cylindrical portion upper portion 77b. In this case, since the shape distortion caused by the three-dimensionalization occurs, even in the same position in the height direction as seen in the plan view as shown in FIG. 3, the portions that differ in the circumferential direction belong to the upper portions 75a and 77b, 77a.

  In addition, if it says about the flexible container bag 1 comprised by the outer bag 2 and the inner bag 3, the main body (flexible container bag main body) 1a of the flexible container bag 1 is comprised by the outer bag main body 10 and the inner bag main body 3a, The outer injection cylinder 30 and the inner injection cylinder 3b constitute an injection cylinder (flexible container bag injection cylinder) 1b of the flexible container bag 1, and the outer discharge cylinder 40 and the inner discharge cylinder 3c constitute a discharge cylinder (flexible tube). A container bag discharge tube) 1c is formed.

  In order to prevent the foreign matter located in the region A between the outer bag 2 and the inner bag 3 from being mixed with the granular material as the contents and discharged or discharged for some reason, the lowest detail 76 at the lower end of the inner bag 3 and The vicinity 76a is protruded from the leading edge or the lower edge 45 of the outer bag discharge cylinder 40 and folded back to the outside of the outer bag discharge cylinder 40, and the folded portion 76b is connected to the lower edge 45 of the outer bag discharge cylinder 40. The vicinity portion, that is, the lower end portion 46 is sewn. Since the lower portion of the inner bag 3 is squeezed so as to form a trapezoidal planar shape as the outlet-side tapered cylindrical portion 77, the outer bag is generally discharged without excessively leaving the lower end portion 76a of the inner bag 3 in the circumferential direction. It can be folded back along the tube 40 and stitched to the lower end 46 of the outer bag discharge tube 40. In addition, this folding | returning part 76b preferably hides the front-end edge 76c of the bottom end most detail 76 of the inner bag 3, as shown in the blow-out part S1 in FIG. 1 and the typical cross-sectional explanatory drawing of FIG. In the state of being folded twice, it is stitched to the tip of the outer bag discharge tube 40 of the outer bag 2. The length required for this folding is typically about 2 cm or less.

  Similarly, foreign matter is prevented from entering the region A between the outer bag 2 and the inner bag 3, and the upper end of the inner bag 3 falls down so that the inner side of the outer bag 3 or the outer bag 2 and the inner bag 3 In order to prevent foreign matter from being mixed and discharged from the region A between the outermost region 74, the uppermost detail 74 of the upper end of the inner bag 3 and its vicinity 74a are connected to the leading edge of the outer injection cylinder 30 or After projecting from the upper end edge 35 and folded back to the outside of the outer injection cylinder 30, the folded portion 74 b is sewn to the vicinity of the upper end edge 35 of the outer injection cylinder 30, that is, the upper end part 36. Here, since the upper portion of the inner bag 3 is squeezed so as to form a trapezoidal planar shape as the entrance-side tapered cylindrical portion 75, the upper end vicinity portion 74a of the inner bag 3 is generally outside without excessively remaining in the circumferential direction. It can be folded back along the injection tube 30 and stitched to the upper end 36 of the outer injection tube 30. This folded portion 74b is also preferably twice so as to hide the leading edge 74c of the uppermost end detail 74 of the inner bag 3, as shown in the blowout portion S2 in FIG. 1 and the schematic sectional explanatory view of FIG. In the folded state, the tip of the injection tube 30 of the outer bag 2 is sewn. The length required for this folding is typically about 2 cm or less.

  In the above-described example, the lengths of the folded portions 74b and 76b at the upper and lower ends of the inner bag 3 are practically ignored. However, for example, when considering the case where each folded portion requires about 2 cm, for example, The height and length of the large-diameter cylindrical portion 73 of the inner bag 3 may be set to about 65 cm or more instead of 60 cm. Instead, the heights L8 and L9 of the entrance side tapered tubular portion 75 and the exit side tapered tubular portion 77 are set to be about 2 cm or more, so that the minimum height portions 75c and 77c are included. Alternatively, the inner bag 3 may be along the outer bag 2 as a whole.

  In the above description, the shape of the inner bag 3 considering the ease of manufacturing the inner bag 3 has been described so that the cost of the flexible container bag 1 can be minimized. The bag 3 may have a three-dimensional shape such as a shape (typically similar) that is practically similar to the outer bag 2. Even in that case, the inner bag 3 is typically formed in a size somewhat larger than that of the outer bag 2 in order to avoid an excessive load. In that case, for example, even if an inner bag is formed at a stretch by inflation or the like, a plurality of three-dimensional parts are joined by heat sealing or the like to form an inner bag, or a planar film is joined by heat sealing. A three-dimensional shape may be formed. Even if a three-dimensional inner bag is prepared, the three-dimensional shape may be somewhat different instead of being similar to the three-dimensional shape of the outer bag 2.

  In the flexible container bag 1 according to a preferred embodiment of the present invention configured as described above, the outer bag 2 and the inner bag 3 have a double structure. Thus, the inner bag 2 can ensure the contamination and moisture prevention of the contents.

  Moreover, in this flexible container bag 1, the vicinity 74a of the upper end edge 74 of the injection | pouring cylinder part 3b of the inner bag 2 is the vicinity of this upper end edge 35 as the folding | returning part 74b turned up outside the upper end edge 35 of the outer injection | pouring cylinder 30. The lower end edge is formed as a folded portion 76b that is stitched to the portion (upper end portion) 36 and a portion 76a in the vicinity of the lower end edge 76 of the discharge tube portion 3c of the inner bag 2 is turned outside the lower end edge 45 of the outer bag discharge tube 40. Since it is sewn to the vicinity (lower end) 46 of 45, there is no possibility that a foreign substance will accidentally mix in the area A between the outer bag 2 and the inner bag 3, and the outer bag 2 and the inner bag 3 Even if a foreign matter enters the region A between the outer bag 2 and the inner bag 3 due to a part of the woven fabric that is the material of the outer bag falling in the region A between the outer bag 2 and the inner bag 3, the foreign matter is like a granular material. There is no fear of being discharged together with the contents (contents stored in the inner bag 3), and contamination It can be kept to a minimum the possibility of ® down.

  Moreover, in this flexible container bag 1, since the opening 32 is formed in the outer injection cylinder 30 and the opening 42 is formed in the outer bag discharge cylinder 40, the inner bag 3 is put in the outer bag 2 and the inner bag. A portion 74a in the vicinity of the upper end edge 74 of the second injection tube portion 3b is folded back as a turned-up portion 74b outside the upper end edge 35 of the outer injection tube 30 and is sewn to a portion (upper end portion) 36 in the vicinity of the upper end edge 35. Even if the vicinity portion 76a of the lower end edge 76 of the second discharge cylinder portion 3c is stitched to the vicinity portion (lower end portion) 46 of the lower end edge 45 as a folded portion 76b outside the lower end edge 45 of the outer discharge tube 40, By folding in the N1 direction from the central portion M of the main body 1a of the flexible container bag 1 toward the injection tube 1b and in the N2 direction toward the discharge tube 1c (after being folded in the circumferential direction as desired) , Outer bag 2 and inner bag 3 Air remaining in region A between can be easily released outward B through the opening 42 of the opening 32 and the outer bag discharge tubes 40 of the outer infusion tube 30. Therefore, the flexible container bag 1 can be folded compactly. If desired, the inner bag 3 may be made to follow the outer bag 2 by blowing compressed air into the inner bag 3 prior to folding. Even in that case, when the inner bag 3 runs along the outer bag 2, the air remaining in the region A between the outer bag 2 and the inner bag 3 becomes the opening 32 of the outer injection tube 30 and the opening 42 of the outer bag discharge tube 40. Can be easily released outward B. However, since the inside of the inner bag 3 is somewhat damaged by the compressed air when compressed air is blown, it is preferable that the inner bag 3 is simply folded without using compressed air or the like when it is particularly desired to avoid the contamination. . In any case, in the flexible container bag 1 of this double structure, since the bag 1 can be folded up easily so as not to take up a space, taking advantage of the characteristic that the bag 1 is flexible, it is troublesome to fold. In addition, a large amount of the bag 1 itself can be easily transported.

  In the flexible container bag 1 of this example, the air holes 32 and 42 as air vent holes are formed at a distance of about L10 = 10 cm from the base end portions 31 and 41 of the outer injection tube 30 and the outer bag discharge tube 40. Even if the inner bag 3 has a flat shape as shown in FIG. 3, the inner bag 3 is not used except when the air is intentionally sent to the air holes 32 and 42 by folding or the like. The polyethylene film constituting the injection tube portion of the bag 3, that is, the inner injection tube 3 b and the outer injection tube 30 is considerably close to the polypropylene woven fabric forming the injection tube 30 and the discharge tube 40 of the outer bag 2. 2, as shown in FIG. 2, the air holes 32 and 42 to the region A between the outer bag 2 and the inner bag 3 are interposed even when not covered by the split portions 15 and 18. The entry and exit of foreign objects Unlikely to occur. That is, for example, when the lower end portion of the inner discharge tube 3c is partially stitched to the lower end portion of the outer bag discharge tube 40 without being folded back, and a downward gap remains, the gap is compared. Even if the size is small, foreign matter may be released from the region between the outer bag 2 and the inner bag 3 through the gap, whereas the air vent holes 32 and 42 are provided on the outer injection cylinder 30 and the outer bag discharge. In the flexible container bag 1 of this example, which is formed on the side surface of the tube 40 and the end portion is practically completely closed by folding or stitching, the space between the outer bag 2 and the inner bag 3 through the air vent hole 42. There is little possibility that foreign matter is released from the region A or foreign matter enters the region A between the outer bag 2 and the inner bag 3 through the air vent hole 32.

  In this flexible container bag 1, although the entrance side tapered tubular portion 75 and the exit side tapered tubular portion 77 of the inner bag 3 are provided with a trapezoidal plane folded shape as shown in FIG. When the three-dimensional shape is folded back to form the inner discharge cylinder 3c and the three-dimensional shape is used, a portion that is susceptible to unexpected force is reinforced with the reinforcing tape 69, so that the three-dimensional shape is stable. Can be done.

  In the above, an example in which the outer bag 2 has a circular cross section has been described, but an elliptical shape or a polygonal shape (such as a square or a hexagon) may be used instead of the circular shape. Further, although an example has been described in which the outer bag 2 includes the top surface portion 13 and the bottom surface portion 16 that expand in a planar shape, the top surface portion 13 and the bottom surface portion 16 lack the clear top surface portion 13 and the bottom surface portion 16 and cooperate with the cylindrical portion 11. It may act and form a granular material storage room. Further, the injection cylinder 30 and the discharge cylinder 40 may be formed in a tapered truncated cone shape or a rectangular tube shape instead of being cylindrical.

  Furthermore, the flexible container bag 1 may be an antistatic flexible container bag. That is, the outer bag 2 may be made of an antistatic woven fabric having a desired degree of conductivity. Moreover, when the outer bag 2 consists of a woven fabric etc. provided with electroconductivity, the inner bag 3 may also consist of a film etc. provided with electroconductivity.

1 Flexible container bag 1a body (flexible container bag body)
1b Injection cylinder (flexible container bag injection cylinder)
1c Discharge tube (flexible container bag discharge tube)
2 Outer bag 3 Inner bag 3a Inner bag body 3b Inner injection cylinder 3c Inner discharge cylinder 10 Outer bag body 11 Large diameter cylindrical parts 12, 19 Inner valve 13 Upper surface part (top surface part)
13a, 16a Peripheral part 14, 17 Opening 15, 18 Chrysanthemum part 15a, 18a Chrysanthemum part 16 Bottom face part 21, 24 Rope insertion hole 22 Injection cylinder rope 22a, 22b, 25a, 25b End part 23, 26 Pipe 25 Discharge cylinder Rope 30 Outer injection cylinder (outer bag filling cylinder)
31, 41 Base end 32, 42 Opening (air vent hole)
33 Injection tube woven fabric 33a, 33b, 43a, 43b End 34, 44 Tying 35 Upper edge 36 Upper edge (near the upper edge)
40 Outer bag discharge tube 43 Discharge tube woven fabric 45 Lower end edge 46 Lower end part (near part of lower end edge)
51, 52 Suspension belts 51a, 552a Intermediate portions 51c, 51d, 52c, 52d End portions 53, 54 Baffle 55 Bottom rope 56 Card case 56a Suspension strap 57 Hook support 61, 62 Vertically extending portions 63, 64 Horizontal direction ( Lateral direction) Extension portions 65, 66 Upper diagonal direction extension portions 67, 68 Lower diagonal direction extension portion 69 Reinforcing tape 71, 72 Opening 73 Large diameter cylindrical portion 74 Upper end most detail 74a Upper end vicinity portion (upper end uppermost portion) Near the details)
74b Folding part 74c Tip edge 75 of uppermost end detail Fine entry side tapered cylindrical part 75a Upper part of entry side tapered tubular part 75b Lower part of entry side tapered tubular part 75c Minimum height part 76 at the center Lower end detail 76a Near the lower end ( Near the bottom end)
76b Turned-back portion 76c Tip edge 77 at the lowest end of the bottom end Outlet side tapered tubular portion 77a Outlet side tapered cylindrical portion lower portion 77b Outlet side tapered cylindrical portion upper portion 77c Minimum height portion at the center A Between the outer bag and the inner bag Region B Outward D1, D2, D3, D9 Diameter F2 Polyethylene film G Folded shape (planar shape in the folded state)
J1, J2 Trapezoid L1, L8, L9 Height L2, L3, L4, L5, L6, L7, L10 Length M Center N1, N2 Direction W1, W2, W3 Width

Claims (6)

A flexible container bag having a double structure including an outer bag and an inner bag accommodated in the outer bag,
An outer bag is connected to one end of the outer bag main body, an outer injection cylinder having a smaller diameter than the outer bag main body, and an outer discharge cylinder having a smaller diameter than the outer bag main body connected to the other end of the outer bag main body. Prepared,
An inner bag body that is disposed in the outer bag body and accommodates the granular material; an inner injection tube that is connected to one end of the inner bag body and is smaller in diameter than the inner bag body and disposed in the outer injection tube; An inner discharge tube connected to the other end of the inner bag body and disposed in the outer discharge tube with a smaller diameter than the inner bag body;
The inner injection tube and the outer injection tube are fixed to each other at the tip, and the inner discharge tube and the outer discharge tube are fixed to each other at the tip,
A flexible container bag having a double structure in which an air vent hole that allows discharge of air in an area between the inner bag and the outer bag is formed in at least one of the outer injection tube and the outer discharge tube.   The double-structure flexible container bag according to claim 1, wherein a plurality of air vent holes are formed at intervals in the circumferential direction of the at least one cylinder.   The outer bag includes a split portion extending from the end portion of the outer bag main body of the at least one cylinder of the outer bag, and a binding rope is passed through the tip portion. The flexible container bag having a double structure according to claim 2, which is configured to cover the air vent hole.   An air vent hole is formed in a region close to the base end portion of the distal end portion of the at least one tube of the outer injection tube and the outer discharge tube and the base end portion of the at least one tube on the outer bag main body side. The double-structure flexible container bag according to claim 3.   The tip of the corresponding tube of the inner bag positioned over the at least one tube of the outer bag protrudes beyond the tip of the at least one tube of the outer bag and is on the tip of the at least one tube of the outer bag The double-layer flexible container bag according to any one of claims 1 to 4, wherein the flexible container bag is folded and stitched.   The double-structure flexible container bag according to any one of claims 1 to 5, wherein an air vent hole is formed in both the outer injection tube and the outer discharge tube.

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