JP4253547B2 - Content injection device, inner bag for aerosol container, and aerosol container - Google Patents

Description

  According to the present invention, an inner container for an aerosol container is arranged and integrated inside an outer can, and the intended contents are stored in the inner bag, and a pressurized fluid is provided between the inner bag for the aerosol container and the outer can. An aerosol container configured to be able to spray without filling the contents filled in the inner bag for the aerosol container with the pressurized fluid by filling, and the inner bag for the aerosol container used for the aerosol container, and the contents The present invention relates to an object injection device.

  An aerosol product that fills a can with the contents to be sprayed and is filled with a pressurized fluid that serves as a propellant, sprays the contents in a mist by operating a valve provided on the can, or injects into a foam Widely used. In this aerosol product, the contents and the pressurized fluid are always in contact with each other, so that the contents may be deteriorated or deteriorated by the pressurized fluid. For this reason, it is necessary to select the contents to be filled and the pressurized fluid that can be kept stable even if they are in contact with each other, or to select a structure in which the two are not in direct contact with each other.

  As an aerosol container in which the contents and the pressurized fluid do not come into direct contact, an inner container for the aerosol container is arranged inside the outer can, and the contents to be sprayed are stored in the inner bag for the aerosol container and the aerosol container A so-called dual structure aerosol container is provided in which a pressurized fluid serving as a propellant is filled between an inner bag and an outer can. In this dual-structure aerosol container, the contents to be injected are filled in the inner bag for the aerosol container and thus do not come into direct contact with the pressurized fluid. The contents do not deteriorate or deteriorate due to the pressurized fluid.

  For example, the technique disclosed in Patent Document 1 includes a deformable and non-extensible inner bag body, an elastic rubber-like macromolecular material outer container, a substance outlet cooperating with the inner bag body, The present invention relates to a spray device constituted by a valve device that controls the release of a substance and a core portion that cooperates with an internal bag body. In this spraying device, after inserting a core part into the inside of the inner bag body and matching the mouth portions of the two, the inner bag body is inserted into the outer periphery of the mouth portion of the inner bag body by fitting the ring into the core portion. It is fixed to. Moreover, after inserting a piston in the inside of the opening part of a core part, the valve mechanism is comprised by fixing a socket to the outer peripheral part of the opening part of an internal bag body. Therefore, the core part constituting the valve mechanism and the socket are formed as separate bodies, and the bag body is fixed to these members not by adhesion or welding but by a pressing action using a ring.

  The technique disclosed in Patent Document 2 relates to a bag body with a spout and a dual structure aerosol container containing the bag body. In this technology, a sprout cylindrical portion provided with a through-hole is formed into a substantially rhombus shape with a piece extending in two directions on a straight line, and the opening of the bag body is heat sealed to the rhombus-shaped portion. It is. In this technique, the spout is formed in a substantially rhombus shape so that heat sealing with a flat bag can be reliably performed.

  In addition, the technique disclosed in Patent Document 3 has an outer bag having an inner bag in which a dip tube that is not deformed or damaged by external pressure is attached to an aerosol valve or a housing, and the dip tube is inserted inside. The present invention relates to a double structure aerosol container made of a can. With this technology, even if the inner bag is crushed and deformed in a weak part of the film or where there is a gap in the contents, the inner bag is not blocked by the presence of the dip tube, and the filled contents remain. It can be taken out without doing.

JP-A-53-89011 Japanese Patent Laid-Open No. 07-251881 Japanese Patent Laid-Open No. 02-1557057

  The technology of Patent Document 1 shows an initial structure of a double-structure aerosol container, and a core portion where a bag body and a valve mechanism are arranged is integrated by pressing (caulking) with a ring-shaped member, In addition, since it is configured using a large number of parts such as a member that constitutes the core, a ring-shaped member, or a socket, the structure must be complicated and a simpler structure is required. Yes.

  The technology of Patent Document 2 enables a large seal length or seal area when heat-sealing the internal bag body by forming the spout shape into a substantially rhombus shape, thus realizing a good heat seal. I can do it. However, since the spout has only the lower end portion of the cylindrical portion formed in a substantially rhombus shape, there is a problem that it is difficult to manage the insertion depth of the inner bag body with respect to the spout.

  The technique of Patent Document 3 is effective because it is possible to take out almost the entire contents filled in the inner bag by providing a dip tube. However, when the inner bag is crushed and closed at the middle part of the dip tube, the contents on the tip side of the dip tube are taken out, but on the opposite side of the tip part of the dip tube from the closed part There is a problem that the contents cannot be taken out.

  In recent double-structure aerosol containers, a hole is formed in the housing, and a dip tube can be inserted into the hole and fixed in many cases. With this structure, it is possible to reduce the material for molding the housing, which is advantageous, but since the bottom of the hole cannot be seen from the outside, there is no limit when inserting the dip tube, and an excessive force is applied. Or the tube has not reached the bottom due to low force.

  In addition, the housing used for the double structure aerosol container is generally formed as a part in which the part for housing the valve mechanism and attaching the dip tube is different from the part for welding or bonding the inner bag. These parts are bonded together, or are engaged with each other by engaging a locking portion represented by an undercut formed on these parts. For this reason, there are problems that the number of parts is large and the number of manufacturing processes is increased.

  The object of the present invention is to facilitate the management of the insertion depth of the packaging bag housing constituting the inner bag for the aerosol container and the mounting operation of the tube, and to reliably weld the packaging bag to the housing. An object of the present invention is to provide an aerosol container that can reliably discharge the contents filled in the container inner bag, an aerosol container inner bag used for the aerosol container, and a contents injection device.

  In order to solve the above problems, a content injection device according to the present invention has a double structure in which a flexible packaging bag is disposed inside an outer can and a pressurized fluid is filled between the packaging bag and the outer can. A content injection device for an aerosol container, wherein the content injection device has a housing having a cylindrical portion that accommodates a valve mechanism and a welding portion that is welded to the packaging bag, and the welding portion of the housing A tube member that opens toward the content storage portion of the packaging bag and an opening are provided.

  In the content injection device, it is preferable in terms of structure that the tubular portion, the welded portion, and the pipe member of the housing are formed by integral molding of synthetic resin, and in particular, the welded portion is an arc portion and both ends of the arc portion. It is preferable that the planar projection shape formed by the extended portion extended from the substantially rhombic shape and the opening of the welded portion is provided in one or two of the extended portions of the substantially rhombic shape. Moreover, it is preferable to provide a plurality of ridges extending in the circumferential direction on the outer periphery of the welded portion. In this way, by forming the welded portion in a substantially rhombus shape, it is possible to provide an opening in the extended portion, and it is possible to sufficiently take the length of the weld line when welding a flat packaging bag, The pressure at the time of welding the housing to the packaging bag can be efficiently applied to the ridges.

  In addition, it is preferable that the outer diameter of the arc portion of the welded portion is smaller than the outer diameter of the cylindrical member at the joint portion between the welded portion and the cylindrical portion. When welding to a bag, the upper end of a welding part and the upper end of a packaging bag can be made to correspond easily. And it is preferable to insert the tube member which protrudes from a housing into a tube, to attach a tube, and to provide a notch in the opening end of the said tube. With this configuration, when the tube member is inserted into the tube, the lower end surface of the housing is brought into contact with the upper end surface of the tube to function as a stopper, thereby managing the insertion depth of the tube member into the tube. I can do it. Also, by providing a notch at the open end of the tube, when the contents of the packaging bag are reduced, even if the tube is pressed against the inner layer of the packaging bag by the pressurized fluid, the tip of the tube will be easily crushed, and the inner layer will be damaged. There is no.

  Moreover, the inner bag for aerosol containers according to the present invention (hereinafter also referred to as “inner bag”) is obtained by welding any of the above-described content injection devices to the upper end of a flexible packaging bag.

  In the inner bag, the packaging bag preferably has a gas barrier layer, and the gas barrier layer is particularly preferably an aluminum foil. It is also advantageous for the packaging bag to have a gusset fold at the bottom. In such an inner bag, the contents stored in the packaging bag and the pressurized fluid can be reliably separated, and the contents do not deteriorate even when stored for a long period of time.

  The aerosol container according to the present invention is one in which any of the inner bags described above is disposed inside an outer can.

  In the said content injection apparatus, attachment of a tube and welding of a packaging bag can be performed reliably.

  Further, in the above inner bag, when the welded portion provided in the housing is inserted into the upper end (housing attachment port) of the packaging bag, the upper end of the packaging bag comes into contact with the cylindrical portion of the housing. As a function. For this reason, the welding position with respect to the housing of a packaging bag can be stabilized.

  In addition, since the tube member provided in the housing is smaller than the diameter of the arc portion constituting the welded portion, when the tube member is inserted into the tube and mounted, the upper end of the tube can be brought into contact with the arc portion for positioning. I can do it. For this reason, it is possible to easily work while visually confirming whether or not the tube is sufficiently attached to the pipe member, and to realize reliable attachment.

  In addition, a passage communicating with the accommodating portion that accommodates the valve mechanism is provided inside the welded portion of the housing, and an opening of this passage is provided in the welded portion, so that the inside of the packaging bag has a bottom side through a tube. The housing is in communication with the housing, and the housing mounting port side is in communication with the housing through the passage. Therefore, even when the packaging bag is crushed and the packaging bag is divided into upper and lower parts, the contents on the bottom side are provided through the tube, and the contents on the housing mounting side are provided in the housing. It is possible to communicate with the accommodating portion through the corresponding passage and to discharge to the outside through the accommodating portion.

  Further, the welded portion of the housing has a substantially rhombus projection shape formed by an arc portion and an extended portion extending from both ends of the arc portion, and by providing a plurality of protrusions on the outer periphery thereof, the welded portion is attached to the packaging bag. When welding, the welded portions are successively thinner due to the rhombus shape, so that the inner layer of the packaging bag can be sandwiched at both ends of the welded portion without causing a gap. And since the pressure at the time of welding can be received intensively by the ridges, reliable welding can be realized even if there is some variation in the pressure on the welding part of the packaging bag.

  Hereinafter, the preferable form of the said content injection apparatus and an inner bag is demonstrated, and an aerosol container is demonstrated collectively. The content injection apparatus according to the present invention has a housing. The housing is formed as an integrally molded product of synthetic resin, and includes a cylindrical portion that accommodates the valve mechanism and a welding portion that is welded to the packaging bag. The inner bag according to the present invention is used for a double-structure aerosol container, and includes a housing formed as an integrally molded product of a synthetic resin, and a flexible packaging bag. It is constructed by welding the welded portion of the housing to the upper end of the bag.

  And since the housing is an integrally molded product, it is possible to reduce the manufacturing process compared to a housing constructed by combining a plurality of conventional molded products, and when the housing is welded to the packaging bag, It is possible to stabilize the position where the housing is inserted, and to stabilize the mounting depth of the tube when the tube is attached to the tube member protruding from the housing.

  In particular, by providing a passage communicating with the housing portion of the valve mechanism provided in the housing, and opening this passage toward the content storage portion of the packaging bag and communicating with the packaging bag, the packaging bag is crushed. Even when the packaging bag is divided into the housing attachment port side and the tip end side of the tube, the contents filled in the packaging bag can be reliably discharged.

  Further, by providing a plurality of protrusions on the outer periphery of the welded portion provided in the housing, when the packaging bag is welded to the welded portion, the pressure acting at the time of welding is concentrated, so that reliable welding is possible.

  The packaging bag has a function of storing and holding the contents to be jetted and protecting the contents by a gas barrier layer, and easily deforms according to the decrease in the internal volume accompanying the contents being discharged. It is flexible.

  The base material of a packaging bag consists of a single layer or a multilayer film which has a synthetic resin layer which can be welded as an innermost layer at least. This film preferably has a gas barrier layer in order to prevent interaction between the contents in the packaging bag and the substance outside the packaging bag. The gas barrier layer is not particularly limited, and a synthetic resin layer such as vinylidene chloride or ethylene-vinyl alcohol copolymer, an oxide vapor deposition layer such as alumina or silica, a metal layer such as aluminum vapor deposition, aluminum foil, tin foil, or the like should be used. I can do it. Of these gas barrier layers, aluminum foil is preferable because it is easy to handle and obtain and has excellent gas barrier performance. The gas barrier layer is preferably used as a laminate laminate by a method such as coextrusion, extrusion lamination, or dry lamination. These films are overlapped or folded to weld the periphery, and a housing attachment opening into which a welded portion of the housing can be inserted is formed.

  The dimensions of the packaging bag are not particularly limited, and are appropriately set according to the capacity of the contents and the size of the outer can. The shape of the package is not particularly limited, and ordinary flat bags, back-attached bags, gusset bags, bottom gusset bags, and the like can be adopted. Of these shapes, the bottom gusset bag is preferred because it is smoothly deformed as the contents are filled and discharged, and the workability when inserted into the outer can is good. And it is more preferable that the bottom gusset portion is provided with an R-shaped seal or an oblique corner seal because the remaining amount of contents is small.

  In the present invention, the material of the synthetic resin film constituting the packaging bag and the material of the metal foil are not limited, and it is preferable to select an optimal one according to the properties of the contents to be filled.

  Since the packaging bag is formed by welding a film and a housing made of a synthetic resin product is welded, at least the innermost layer of the packaging bag has a high welding performance and is good for the synthetic resin material constituting the housing. It is necessary to have a good welding performance. Polyethylene terephthalate (PET) or the like, which has high welding performance and has moderate strength and flexibility, such as polyethylene (PE) and polypropylene (PP), which hardly absorb fragrance components, etc. It is possible to employ selectively.

  Further, the film of the packaging bag needs to be smoothly deformed as the contents are filled and the contents are discharged. For this reason, it is necessary to have flexibility and moderate strength.

  In particular, as the inner bag of a double-layer aerosol container, PET is used on the outermost side in terms of physical strength, and nylon is laminated on this PET layer as a pinhole-resistant layer, and an aluminum foil is dried on the nylon layer. It is preferable to use a laminate obtained by laminating and laminating a PP layer as the innermost layer. The PP layer is for selecting the PP resin as a resin having excellent strength and hardness and capable of being welded to the innermost layer of the packaging bag. If the housing can be made of PE resin, there is no problem even if it is replaced with the PE layer. Furthermore, similar to PP and PE described above, various synthetic resins are preferably used by appropriately selecting the innermost layer resin of the film and the resin of the housing so as to be a combination of synthetic resin materials of the same system. Is possible.

  The housing is formed by integrally forming a housing portion for housing the valve mechanism, a welding portion for welding the packaging bag, and a tube member for mounting the tube. In this way, by configuring the housing in which the respective parts are integrally formed, it is possible to reduce the number of parts and eliminate the assembly process, thereby realizing rationalization of manufacturing.

  The material constituting the housing is not particularly limited. However, as described above, in order to realize good welding with the packaging bag, it is necessary to emphasize the welding performance with the synthetic resin film constituting the inner layer of the packaging bag, and it is also necessary to ensure the molding performance. Such materials include PP and PE, and any of them can be preferably used.

  The housing has a cylindrical portion with a bottomed housing portion formed therein, a welded portion formed continuously with the tubular portion, and a tube member formed so as to protrude through substantially the center of the welded portion. ing. A flow hole that penetrates the bottom of the housing portion is formed at the center of the tube member, and a passage that penetrates the bottom of the housing portion is formed inside the welded portion separately from the tube member. It is preferable that an opening is made at the welded portion toward the article storage portion. More preferably, the opening or the opening and the passage are provided in an end extension of the substantially diamond-shaped weld. Thus, by forming the tube member and the opening in the housing, when the tube is attached to the tube member, it becomes possible to discharge the contents far away from the housing by the tube, and through the opening provided in the housing. Thus, the contents in the vicinity of the housing can be discharged.

  The welding part formed in the housing is a part for melting and integrating a part of the surface side by inserting a heat seal bar or the like from the outside of the packaging bag, inserted into the housing mounting opening of the packaging bag. is there. Since the packaging bag is formed by superimposing or folding a film, the packaging bag is configured as a flat bag. Therefore, the portion constituting the housing mounting opening is not a circular shape but a flat open end. For this reason, it is preferable that the shape of the welded portion provided in the housing is also a shape that can be easily sandwiched between the films of the packaging bag without applying an excessive force to the housing mounting opening.

  Accordingly, the welded portion formed on the housing has a planar projection shape (a shape projected on a plane perpendicular to the axial direction of the housing) in two directions along an arc portion and a straight line passing through the center from the arc portion. It is formed so as to be a substantially rhombus with an extended portion formed on.

  The arc part which comprises a welding part is formed with the diameter smaller than the outer diameter of the cylindrical part of a housing, and has provided the level | step difference between the cylindrical parts. This level difference functions as a stopper when the welded portion is inserted into the housing attachment port of the packaging bag, thereby eliminating variations in the welding position when the packaging bag is welded to the housing.

  As described above, the outer shape of the welded portion is preferably a substantially rhombus shape. And in order to improve welding performance with a packaging bag and implement | achieve reliable welding, it is more preferable to provide several protrusion on the outer periphery. The number of protrusions, the height dimension, the width dimension, and the like are not particularly limited, and are preferably numbers and dimensions that satisfy the required welding strength between the housing and the packaging bag.

  When multiple ridges are provided on the outer periphery of the welded part, the pressure of the seal tooth profile tends to concentrate on the ridges when heated when welding a packaging bag to the welded part, so the ridges are easily melted. Therefore, the packaging bag can be reliably welded to the welded portion.

  A tube member is formed through the substantially center of the welded portion from the bottom of the accommodating portion that accommodates the valve mechanism formed inside the tubular portion, and the end of the tube member protrudes from the end of the welded portion. And open toward the contents storage part of the packaging bag. The outer diameter of the tube member is smaller than the diameter of the arc portion in the welded portion, and a step portion is formed between the end of the welded portion and the tube member. This step portion functions as a stopper when the tube is attached to the tube member.

  Since the welded part is formed in a substantially rhombus shape, it reaches the bottom of the housing part provided in the cylindrical part of the housing inside the part of the welded part extended in the rhombus and between the outer periphery of the pipe member It is possible to form a gap. This gap opens at the lower end of the housing toward the contents storage portion of the packaging bag, and further, it is possible to form a passage that passes through the bottom and connects the clearance and the storage portion. By configuring the housing in this way, the accommodating portion is electrically connected to the outside through a path having a route different from that of the pipe member. Therefore, when the packaging bag is welded to the welded portion, the opening of the tube member and the housing is electrically connected to the inside of the packaging bag.

  The tube attached to the tube member has a function of discharging the contents filled in the packaging bag. For this reason, it is preferable that the tip of the tube has a length that can reach a position deeper than at least the center of the packaging bag in the depth direction. Moreover, it is preferable that a tube has the intensity | strength which is not deform | transformed even if this packaging bag press-contacts when a packaging bag is crushed.

  By using the tube as described above, even if the packaging bag is crushed and the packaging bag is divided into upper and lower parts, it is possible to secure a flow path for the contents on the bottom side of the packaging bag. It becomes possible. In addition, since the opening of the passage formed in the housing exists on the housing mounting opening side of the packaging bag, even if the packaging bag is crushed, the passage of contents on the housing mounting opening side is ensured. It becomes possible. For this reason, it is possible to reliably discharge the contents filled in the packaging bag.

  In addition, it is preferable to cut the tip of the tube into a V shape so that it can be easily deformed. By making such a cut, the packaging bag is deflated during vacuum suction of the packaging bag prior to filling the contents, or in the process of discharging the contents, and the inner layer of the packaging bag at the tip of the tube Even if pressed, the tube is easily deformed, so that no wrinkles are formed on the packaging bag or the synthetic resin film constituting the inner layer is not damaged.

  Next, the structure of the packaging bag structure according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of the inner bag. FIG. 2 is a cross-sectional view illustrating the configuration of the housing and the tube. 3 is a view taken along the line III-III in FIG. 4 is a view for explaining the outer shape of the housing, and is a view taken along arrows IV-IV in FIG. FIG. 5 is a perspective view of the housing from the tube member side before the tube is attached. FIG. 6 is a diagram illustrating the layer structure of the packaging bag. FIG. 7 is a diagram schematically illustrating the configuration of a dual-structure aerosol container.

  In FIG. 1 to FIG. 6, the inner bag A has a packaging bag 1 formed with a preset size. The packaging bag 1 is formed by forming a gusset fold at the bottom and heat-sealing the periphery using a laminated laminate comprising a synthetic resin film and an aluminum foil that are dry laminated to form four layers. A housing attachment opening 1 a is formed at the upper end of the packaging bag 1. In addition, the bottom part of the packaging bag 1 does not necessarily need to be a gusset fold, and a simple flat bag may be sufficient.

  In particular, as shown in FIG. 6, the packaging bag 1 has a PET layer 1c made of a PET film on the front side, a nylon layer 1d as a pinhole-resistant layer inside the PET layer 1c, and a nylon layer 1d. A laminated laminate in which an aluminum layer 1e is formed by laminating an aluminum foil as a gas barrier layer inside and a PP layer 1f is formed as the innermost layer is used.

  The housing 2 is formed so as to penetrate the welded portion 5 and the tubular portion 4 in which the housing portion 3 for housing the valve mechanism B is formed, the welded portion 5 formed at the end of the tubular portion 4, and the welded portion 5. The pipe member 6 and the passage 7 formed between the pipe member 6 and the inside of the welded portion 5 are integrally formed of PP resin. In particular, the weld portion 5 is formed in a substantially rhombus shape by the arc portion 5a and the extension portion 5b, and a plurality of protrusions 8 are formed on the outer periphery.

  The accommodating portion 3 is open at the upper end side to accommodate the valve mechanism B therein, and is provided with a bottom plate 3a at the bottom. A tube member 6 is formed on the bottom plate 3a on the welded portion 5 side, and a through hole 6a formed in the tube member 5 is formed therethrough. Further, a passage 7 a that is electrically connected to the passage 7 is formed at a position of the bottom plate 3 a corresponding to the inside of the welded portion 5 and the outer periphery of the pipe member 6. Therefore, the accommodating part 3 is electrically connected to the packaging bag 1 by the flow hole 6a of the pipe member 6 and the passage 7a.

  The structure of the valve mechanism B accommodated in the accommodating part 3 is not specifically limited. In the present embodiment, a stem 9 having holes 9a and 9b communicating with the outside, a spring 10 for urging the stem 9 upward, and a hole 9b of the stem 9 are disposed so as to move up and down. And a closing member 11 for closing or opening the hole 9b.

  The closing member 11 is disposed at the opening end of the accommodating portion 3. The opening end portion of the accommodating portion 3 is coincident with the upper end of the cylindrical portion 4 of the housing 2, and the projection 4 a formed on the upper end side of the cylindrical portion 4 is covered with the mountain cup 13 and caulked. 9, the valve mechanism B can be configured by disposing the spring 10 and the closing member 11 at predetermined positions.

  In the valve mechanism B configured as described above, as shown on the left side from the center line in FIG. 2, when the stem 9 is biased by the spring 10 and is in the upper movement limit, the closing member 11 is in the hole 9 b of the stem 9. Is closed to prevent conduction between the housing 3 and the outside. Further, as shown on the right side from the center line of FIG. 2, when the stem 9 is pushed down, the closing member 11 is deformed to open the hole 9 b of the stem 9 and the inside of the packaging bag 1 through the accommodating portion 3. The contents filled in the packaging bag 1 are discharged.

  As shown in FIG. 3, the planar projection shape of the welded portion 5 is formed in a substantially rhombus shape that becomes an arc portion 5 a and an extension portion 5 b. The diameter of the circular arc part 5 a is smaller than the outer diameter of the cylindrical part 4, and the total length of the extension part 5 b is larger than the outer diameter of the cylindrical part 4. In particular, it is essential that the diameter of the arc portion 5a is smaller than the outer diameter of the cylindrical portion 4, but the total length of the extension portion 5b is not particularly limited.

  As described above, since the diameter of the arc portion 5a of the welded portion 5 is smaller than the outer diameter of the tubular portion 4, the stepped portion between the end surface 4b of the tubular portion 4 and the welded portion 5 as shown in FIG. The end surface 4b can be used as a stopper when the packaging bag 1 is welded to the welded portion 5.

  The tube member 6 is integrally formed so as to protrude from the bottom plate 3 a of the accommodating portion 3, and the end portion 6 b is disposed at a position that is fully separated from the end surface 5 c of the welded portion 5. The tube member 6 does not need to form a gap with the arc portion 5 a of the welded portion 5, and may be formed integrally with the welded portion 5. However, it is necessary to form the passage 7 between the extension portion 5 b of the welded portion 5.

  In particular, a tube 14 is attached to the tube member 6. The outer diameter of the tube 14 attached to the pipe member 6 is preferably substantially equal to or smaller than the arc portion 5a of the welded portion 5. For this reason, the outer diameter of the tube member 6 is smaller by the thickness of the tube 14 than the diameter of the arc portion 5 a of the weld portion 5, and a step is formed between the end surface 5 c of the weld portion 5.

  A tube 14 is attached to the tube member 6. The tube 14 has a dimension such that its length is deeper than the central portion in the depth direction of the packaging bag 1. And when attaching the tube 14 to the pipe member 6, the end surface 5c of the welding part 5 can exhibit the function as a stopper of the tube 14. FIG. Further, the tip 14a of the tube 14 is formed with a notch 15 for facilitating deformation of the tip 14a. When the packaging bag 1 is crushed or deflated, the tip 14a of the tube 14 is also deformed together. The packaging bag 1 is not damaged.

  Next, a procedure for configuring the inner bag A will be briefly described. The member constituting the valve mechanism B is accommodated in the accommodating portion 3 of the housing 2 and the mountain cup 13 is attached. In this state, the tube 14 is attached to the tube member 6. At this time, the tube 14 is attached to the tube member 6. It is possible to realize a reliable mounting operation by confirming that the end portion comes into contact with the end surface 5c of the weld portion 5 by being inserted into the welding portion 5.

  Next, the housing attachment opening 1a provided in the packaging bag 1 is enlarged, and the housing 2 is inserted into the housing attachment opening 1a from the tube 14 side. The housing 2 is inserted into the packaging bag 1 until the end of the packaging bag 1 abuts against the end surface 4b of the cylindrical body 4, and the insertion is stopped after confirming that the packaging bag 1 abuts against the end surface 4b. To do.

  Next, a heat seal bar (not shown) is pressed against the outer periphery of the housing attachment opening 1a of the packaging bag 1 to melt the protrusions 8 formed on the outer periphery of the welding portion 5 and the welding portion 5 itself and the packaging bag 1. The synthetic resin layer constituting the inner layer is melted and welded. Thereby, the inner bag A shown in FIG. 1 is comprised.

  As shown in FIG. 5, the inner bag A is housed in a can 21 and the mountain cup 13 is caulked and integrated with the can 21. Further, the gap 22 formed between the can 21 and the packaging bag 1 is filled with a pressurized fluid, and a force acts on the packaging bag 1 by the pressurized fluid. A nozzle 23 is attached to the stem 9 constituting the valve mechanism B to form a double-structure aerosol container C.

  In the aerosol container C having a double structure configured as described above, the inner space of the packaging bag 1 constituting the inner bag A is a passage provided in the housing 2 through the tube 14 and the flow hole 6a of the tube member 6. 7 and 7a are electrically connected to the accommodating portion 3. Therefore, when the user pushes down the nozzle 23, the inside of the housing portion 3 becomes atmospheric pressure, and the contents filled in the packaging bag 1 due to the pressure difference with the packaging bag 1 pass through the housing portion 3 from the nozzle 23 to the atmosphere. To be discharged.

  In particular, the packaging bag 1 is electrically connected to the accommodating portion 3 at both ends on the bottom side and the housing attachment port 1a side, and even if the packaging bag 1 is crushed for some reason and the inside is divided. The contents can be conducted from the bottom side and the top side of the packaging bag 1 to the accommodating portion 3 and discharged to the outside.

  Inner bag A configured as described above can be used for aerosol products that are preferably filled separately from the contents and propellant, and can be turned upside down when the contents are injected. It is possible to use it for aerosol products that have the characteristics.

It is a figure explaining the structure of an inner bag. It is sectional drawing explaining the structure of a housing and a tube. It is the III-III arrow line view of FIG. It is a figure explaining the external shape of a housing, and is the IV-IV arrow line view of FIG. It is the perspective view which looked at the housing from the pipe member side. It is a figure explaining the layer structure of a packaging bag. It is a figure which illustrates the composition of a double structure aerosol container typically.

Explanation of symbols

A Inner bag B Valve mechanism C Double-layer aerosol container 1 Packaging bag 1a Housing attachment port 2 Housing 3 Housing 3a Bottom plate (drawing completed)
4 Cylindrical part 4a Protrusion part 4b End face 5 Welding part 5a Arc part 5b Extension part 5c End face 6 Pipe member 6a Flow hole 7, 7a Passage 8 Projection 9 Stem 9a, 9b Hole 10 Spring 11 Closing member 13 Mountain cup 14a Tube 14 Tip 15 Cut 21 Can 22 Air gap 23 Nozzle

Claims (13)

A content injection device for a double structure aerosol container in which a flexible packaging bag for storing contents is disposed inside an outer can, and a pressurized fluid is filled between the packaging bag and the outer can. The content injection device has a housing having a cylindrical portion that accommodates the valve mechanism and a welded portion that is welded to the packaging bag, and the welded portion of the housing faces the content storage portion of the packaging bag A content injection device provided with a pipe member and an opening that are opened. The content injection device according to claim 1, wherein the tubular portion, the welded portion, and the tube member of the housing are configured by integral molding of synthetic resin. 3. The content injection device according to claim 1, wherein the welded portion has a substantially rhombus in a planar projection shape including an arc portion and an extension portion extended from both ends of the arc portion. The content injection device according to claim 3, wherein the opening of the welded portion is provided in one or two of the extended portions of a substantially rhombus. The content injection device according to any one of claims 1 to 4, wherein an outer diameter of an arc portion of the welded portion is smaller than an outer diameter of the tubular member at a joint portion between the welded portion and the cylindrical portion. The content injection device according to any one of claims 1 to 5, wherein a plurality of protrusions extending in a circumferential direction are provided on an outer periphery of the weld portion. The content injection device according to any one of claims 1 to 6, wherein a tube member is inserted by inserting a tube member of the housing. The content injection apparatus according to claim 7, wherein a cut is provided at an open end of the tube. An inner bag for an aerosol container, wherein the content injection device according to any one of claims 1 to 8 is welded to an upper end of a flexible packaging bag. The inner bag for an aerosol container according to claim 9, wherein the packaging bag has a gas barrier layer. The inner bag for an aerosol container according to claim 10, wherein the gas barrier layer is an aluminum foil. The inner bag for an aerosol container according to any one of claims 9 to 11, wherein the packaging bag has a gusset fold at the bottom. An aerosol container comprising the aerosol container inner bag according to any one of claims 9 to 12 disposed inside an outer can.