JP5098689B2 - Composite container - Google Patents

Description

  The present invention relates to a composite container in which an outer container made of pulp mold and an inner container made of resin are combined.

  Conventionally, plastic containers such as polypropylene resin and polyethylene terephthalate (PET) resin, or aluminum or steel metal cans have been mainly used as containers for storing various contents such as liquids, gels and powders. However, in recent years, containers that reduce the amount of plastic and metal used are desired from the viewpoint of increasing waste and protecting resources.

  Therefore, it consists of a paper outer container (carton) and a plastic inner bag container with a cap-equipped pouring tool at one end. The inner surface of the outer container (carton) and the outer surface of the inner bag container are integrated by point sealing. A complex container has been developed. This composite container can save oil resources by thinning the inner bag container, and can be easily separated from the outer container (carton) and inner bag container at the time of disposal, and can also separate paper and plastic. This type of container is widely used mainly for over-the-counter sales of beverages such as soft drinks, shochu, sake and wine.

  Since such a composite container uses a packaged exterior container, the side surface of the container is bent by a ruled line. Therefore, the container design is limited to a polygonal shape such as a square or a rectangle in cross section, and a shape having a curved surface is difficult.

Therefore, a composite container having a degree of freedom in the container shape has been proposed. For example, in Patent Documents 1 and 2, a plastic inner container is integrated by stretch blow molding inside a pulp mold exterior material. A composite container is disclosed. Since this composite container uses a pulp molded product as an exterior material, the shape can be designed freely.
Japanese Patent Laid-Open No. 2001-130528 JP 2002-264944 A

  However, in the methods of Patent Documents 1 and 2, it is necessary to fill the contents after the exterior material and the inner container are integrated by blow molding. For this reason, the contents may scatter and adhere to the exterior material made of pulp mold at the time of filling, and there are problems that spots where the contents are attached become spots and dirt, and mold is generated.

  An object of this invention is to provide the composite container which can prevent the contamination of an exterior body at the time of filling of the content while ensuring the freedom degree of a shape in view of the said problem.

  To achieve the above object, the present invention provides a bag formed of a laminate including at least a base material layer and an innermost thermoplastic resin layer, a spout fixed to the upper end of the bag, And an outer body constituted by a pair of pulp mold molded bodies that coat the outer surface of the inner container excluding a part of the spout, and are combined into a composite container. .

  In the composite container having the above-described configuration, at least one joining piece is integrally formed on the joining surface of each pulp mold molded body, and the joining piece is bent to the inside of the pulp mold molded body. The exterior body is formed by adhering a joining surface and the joining pieces facing each other.

  In the composite container having the above-described configuration, the pulp mold molded body is fitted on the outer peripheral surface of the spout and a fitting portion that restricts the rotation of the spout with respect to the exterior body is formed. It is a feature.

  According to the present invention, in the composite container configured as described above, the cross-section of the fitting portion has a shape having at least one linear portion or an elliptical shape.

  Moreover, the present invention is characterized in that, in the composite container configured as described above, a cross section of the fitting portion has a polygonal shape.

  Moreover, the present invention is characterized in that, in the composite container configured as described above, the pulp mold molded body has a shape obtained by dividing the exterior body into substantially half when viewed from the spout side.

  Moreover, the present invention is characterized in that, in the composite container having the above-described configuration, the pulp mold molded body has a shape obtained by dividing the exterior body into the spout side and the bag side.

  Further, the present invention is characterized in that, in the composite container having the above-described configuration, a perforation is formed that allows the spout to be removed by breaking a part of the pulp mold molded body.

  According to the first configuration of the present invention, by forming the exterior body as a pulp mold molded body, it is possible to form an exterior body having a curved surface, and the degree of freedom in designing the composite container can be increased. Moreover, since the exterior body is divided into a pair of pulp mold molded bodies, the exterior body can be mounted after filling the inner container composed of the bag body and the spout, and during the filling operation It is possible to reliably prevent the exterior body from being contaminated by the scattered contents.

  Moreover, according to the 2nd structure of this invention, in the composite container of the said 1st structure, at least 1 joining piece is integrally formed in the joining surface of each pulp mold molding, and a joining piece is a pulp mold molding. By bending inward and bonding the bonding surfaces and the bonding pieces facing each other, the bonding area can be expanded and the pulp mold molded body can be firmly bonded, and the smoothness of the surface of the formed exterior body can also be maintained. .

  Moreover, according to the 3rd structure of this invention, in the composite container of the said 1st or 2nd structure, a pulp mold molded object fits to the outer peripheral surface of a spout, and rotation of the spout with respect to an exterior body is carried out. By forming the fitting portion to be regulated, the spout can be supported on the pulp mold molded body with a simple configuration. In addition, since the relative rotation between the formed exterior body and the spout is restricted, the cap can be easily opened and closed when a screw cap is attached to the spout.

  Further, according to the fourth configuration of the present invention, in the composite container of the third configuration, the cross section of the fitting portion is formed into a shape having at least one linear portion or an elliptical shape, thereby providing an exterior with a simple configuration. The relative rotation between the body and the spout can be restricted.

  According to the fifth configuration of the present invention, in the composite container having the fourth configuration, the relative rotation between the exterior body and the spout is more reliably regulated by making the cross section of the fitting portion polygonal. can do.

  Moreover, according to the sixth configuration of the present invention, in the composite container having any one of the first to fifth configurations, each pulp mold molded body is divided into approximately half when viewed from the spout side. By making it a shape, a pair of pulp mold moldings can be made the same shape, which is advantageous in terms of reducing the number of parts and manufacturing costs.

  Further, according to the seventh configuration of the present invention, in the composite container of any one of the first to fifth configurations, each pulp mold molded body has a shape obtained by dividing the exterior body into the spout side and the bag side. By doing so, the bottom of the pulp mold molded body on the bag body side constituting the lower part of the exterior body can be molded flat, and the stability when placing the composite container without post-processing can be improved. it can.

  Moreover, according to the 8th structure of this invention, in the composite container of the said any one of the said 1st thru | or 7th structure, the perforation which fractures | ruptures a part of pulp molded object and makes a spout removable By forming, the exterior body and the inner container after use can be easily separated, and the recyclability of the composite container is improved.

  Hereinafter, the composite container of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a composite container according to a first embodiment of the present invention. The composite container 1 includes a pair of pulps that cover the outer surface of the inner container 4 from the side surface and the inner container 4 having a bag body 2 in which the contents are accommodated and a spout 3 for flowing out the contents to the outside. It is comprised with the exterior body 6 which consists of the molded objects 5a and 5b.

  The bag body 2 is formed of a laminate including at least a base material layer serving as an outermost layer (external body 6 side) and a thermoplastic resin layer serving as an innermost layer. Since the base material layer becomes a basic material constituting the package, and further, when a barrier layer (described later) made of a metal or metal oxide thin film is provided, it becomes a base material for holding the barrier layer. It can withstand the conditions of forming and processing, and can be held well without impairing its properties. In addition, when manufacturing packaging, workability, heat resistance, slipperiness, pinhole resistance It is preferable that it is excellent in water vapor or gas barrier properties and other physical properties.

  As such a base material layer, a simple substance such as a biaxially stretched nylon film, a biaxially stretched polypropylene (OPP) film, a biaxially stretched polyester resin film or a laminate thereof is used, and a biaxially stretched polyester resin film is used. Is particularly preferably used. Specific examples of the biaxially stretched polyester resin film include polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene-2, 6-naphthalate resin, polybutylene-2, 6-naphthalate resin, and polycyclohexanedimethylene terephthalate resin. Various polyester resins can be used. As for the thickness of a base material layer, about 3-50 micrometers is desirable.

  The thermoplastic resin layer may be any layer that can be melted by heat and fused together to form the bag 2, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (Linear) Low density polyethylene, ethylene / α-olefin copolymer polymerized using metallocene catalyst (single site catalyst), polypropylene, ethylene / vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer Polyolefin resins such as polymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene, acrylic acid, methacrylic acid, maleic anhydride, fumaric acid Acid-modified polyolefin resin modified with unsaturated carboxylic acid such as It one not selected from may be used or two or more kinds. The thickness of the thermoplastic resin layer is preferably about 10 μm to 100 μm in consideration of heat sealability and the like.

  In addition, for example, workability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, mold release properties, flame retardancy, antifungal properties, electrical properties, strength, etc. are improved and modified. For this purpose, various plastic compounding agents and additives can be added to the melt-extruded resin constituting the thermoplastic resin layer. Examples of general additives include lubricants, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, and the like. Resin etc. can also be used.

  In order to increase the adhesive strength between the base material layer and the thermoplastic resin layer, an anchor coat layer is laminated on the back surface of the base material layer, and a three-layer structure in which a thermoplastic resin layer is further laminated on the anchor coat layer is also possible. good. An anchor coat layer chemically processes the back surface of a base material layer. The thickness of the anchor coat layer is usually preferably about 0.1 to 2.0 μm. As the anchor coat agent constituting the anchor coat layer, for example, an isocyanate (urethane), polyethyleneimine, polybutadiene, organic titanium, or other anchor coat agent can be used.

  Further, when the contents are liquid, or when the contents are easily changed by moisture or oxygen, the bag body 2 is required to have high water vapor barrier properties and gas barrier properties. In such a case, a barrier layer can also be formed between the base material layer and the thermoplastic resin layer. The barrier layer can be basically used as long as it is a metal foil or a vapor-deposited film on which a metal or metal oxide is vapor-deposited. Examples of the material include silicon (Si), aluminum (Al), and magnesium (Mg). ), Calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y) or other metals or The oxide can be used. Preferable examples include silicon (Si) and aluminum (Al) oxides.

The notation of the above metal oxide is, for example, SiOx, AlOx. MOx, such as MgOx (In the formula, M represents a metal element, and the value of X varies depending on the metal element.). As the range of the value of X, 0 to 2 for silicon (Si), 0 to 1.5 for aluminum (Al), 0 to 1 for magnesium (Mg), 0 to 1 for calcium (Ca). 1, 0 to 0.5 for potassium (K), 0 to 2 for tin (Sn), 0 to 0.5 for sodium (Na), 0 to 1, 5 for boron (B), titanium ( Ti) can be 0 to 2, lead (Pb) is 0 to 1, zirconium (Zr) is 0 to 2, and yttrium (Y) is 0 to 1.5.

  In the above, when X = 0, it is a complete metal, and the composite container 1 of the present invention can be used because the bag body 2 does not require transparency. Moreover, the upper limit of the range of X is a value in a state where the metal is completely oxidized. In the present invention, examples other than silicon (Si) and aluminum (Al) are generally poor. Silicon (Si) is 1.0 to 2.0, and aluminum (Al) is 0.5 to 1. Those in the range of .5 can be used.

  The thickness of the barrier layer as described above is 5 to 30 μm when the barrier layer is a metal foil, and varies depending on the type of metal or metal oxide used when the barrier layer is a deposited film. It is desirable to select and form arbitrarily within the range of about 2000 mm, preferably about 100 to 1000 mm. Moreover, the metal or metal oxide used as a barrier layer can be used in 2 or more types of mixtures, and the vapor deposition film | membrane of the metal or metal oxide mixed by the dissimilar material can also be comprised.

  In addition, in order to improve the adhesion between the barrier layer and the base material layer and the thermoplastic resin layer laminated on both sides thereof, to firmly adhere both of them and prevent the occurrence of delamination, After the barrier layer is deposited on the back surface of the base material layer via the anchor coat layer, a thermoplastic resin layer may be further formed via the anchor coat layer.

  When forming a thermoplastic resin layer using a thermoplastic single layer or multilayer film, a dry laminate layer may be laminated instead of the anchor coat layer. Examples of the laminating adhesive constituting the dry laminating layer include, for example, polyvinyl acetate adhesive, homopolymers such as ethyl acrylate, butyl, 2-ethylhexyl ester, and methyl methacrylate, acrylonitrile, styrene, etc. Copolymers such as polyacrylic acid ester adhesives, cyanoacrylate adhesives, and copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc. System adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives made of urea resin or melamine resin, phenol resin adhesives, epoxy adhesives, polyurethane Adhesives, reactive (meth) acrylic adhesives, Ropurengomu, nitrile rubber, styrene - rubber adhesive comprising a butadiene rubber, a silicone-based adhesive, an alkali metal silicate, may be used an inorganic adhesive or the like made of a low-melting-point glass or the like.

  In addition, since it is assumed that the composite container 1 may be subjected to physically and chemically severe conditions during the manufacturing process, post-manufacture transportation, and storage, the bag body 2 also has high sealing performance, pinhole resistance, and heat resistance. , Light resistance, quality maintenance, workability, hygiene, etc. may be required. Therefore, in order to satisfy the above various conditions, an intermediate layer can be laminated between the base material layer and the thermoplastic resin layer.

  Examples of the intermediate layer include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, and ethylene-ethyl acrylate copolymer. Polymer, ethylene-acrylic acid or methacrylic acid copolymer, methylpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly (Meth) acrylic resin, polyacrylonitrile resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene styrene copolymer (ABS resin), polyester resin, polyamide resin, polycar Any known resin film or sheet such as nate resin, polyvinyl alcohol resin, saponified ethylene-vinyl acetate copolymer, fluorine resin, diene resin, polyacetal resin, polyurethane resin, nitrocellulose, etc. Can be used. In addition, a light-shielding film or sheet obtained by adding a desired additive such as a colorant or an ultraviolet absorber and kneading to form a film can also be used.

  The film or sheet may be any of unstretched and uniaxially or biaxially stretched. Moreover, although the thickness of an intermediate | middle layer is arbitrary, it can select and use from the range of about several micrometers-300 micrometers. Furthermore, as a method for laminating the intermediate layer, any of extrusion film formation, inflation film formation, coating film, dry lamination, and the like may be used.

  If the typical structure of the laminated body which comprises the bag body 2 is illustrated, OPP (base material layer) 40micrometer / dry laminated layer / Si vapor deposition nylon (barrier layer) 25micrometer / low density polyethylene (thermoplastic resin layer) 60micrometer Can be mentioned.

  2 and 3 are an enlarged cross-sectional view and a plan view showing a state in which the joint portion between the pulp mold molded bodies 5a and 5b and the spout 3 is disassembled. The spout 3 is a cylindrical molded product that is injection-molded with a thermoplastic resin. A thread 3 a for screwing a screw cap 7 (see FIG. 1) onto the outer surface of the spout 3, and an annular shape The flanges 3b and 3c are formed. The opening of the bag body 2 is fused to the back surface of the flange 3c by heat sealing or ultrasonic sealing, and the inside of the bag body 2 communicates with the outside through the spout 3. As the material of the spout 3, the same material as the thermoplastic resin layer on the inner surface of the bag body 2 is used so that the spout 3 can be easily fused. The spout 3 is also used as a filling port when the inner container 4 is filled with contents.

  The flange portions 3b and 3c form a fitting portion 9 into which the upper end portions 8a and 8b of the pulp mold molded bodies 5a and 5b are fitted. As shown in FIG. 3, the cross-sectional shape of the fitting portion 9 of the spout 3 is square, and when the exterior body 6 is attached to the inner container 4, the upper end portions 8 a and 8 b of the pulp mold molded bodies 5 a and 5 b are attached. While being inserted into the gap between the flange portions 3b and 3c, the triangular cutout portion 10 formed in the upper end portions 8a and 8b is joined so as to sandwich the fitting portion 9 from both sides.

  With this configuration, the spout 3 is fixed in the vertical direction with respect to the exterior body 6 as shown in FIG. In addition, since the rotation of the spout 3 with respect to the exterior body 6 is restricted by the engagement between the fitting portion 9 and the notch 10, the spout 3 does not rotate when the screw cap 7 is opened and closed, and the composite container 1 can be opened and closed easily. That is, the fitting part 9 has a function of restricting the vertical rotation of the spout 3 and restricting the relative rotation of the spout 3 and the exterior body 6.

  Here, although the cross-sectional shape of the fitting portion 9 is a square, it may be a polygonal shape such as a rectangle, a triangle, or a pentagon, a shape having at least one straight portion such as a D shape, or an elliptical shape. In particular, if the cross-sectional shape is a polygonal shape, the torque generated when the screw cap 7 is opened and closed can be received evenly over the entire circumference of the fitting portion 9, and relative rotation between the exterior body 6 and the spout 3 can be further ensured. Can be regulated. Alternatively, if a protrusion is formed on the outer peripheral surface of the fitting portion 9 and comb-shaped notches that engage with the protrusion are formed on the upper end portions 8a and 8b of the pulp mold molded bodies 5a and 5b, the fitting is achieved. The cross-sectional shape of the part 9 can also be circular.

  Further, a perforation 11 is formed around the notch 10 at the upper end 8b of the pulp molded body 5b. After all the contents of the inner container 4 are used, the pulp mold molded body 5b is pushed along the perforation 11 to release the engagement between the fitting portion 9 and the cutout portion 10 of the spout 3. The And by grasping the spout 3 and pulling out the bag body 2 from the exterior body 6, the resin inner container 4 and the paper exterior body 6 can be easily separated, and the recyclability of the composite container 1. Will improve.

  FIG. 4 is a side view of the pulp mold molded body as viewed from the joint surface side, and FIG. 5 is a longitudinal sectional view of the pulp mold molded body (a cross-sectional view taken along line AA ′ in FIG. 4). In addition, since the pulp mold moldings 5a and 5b have a shape obtained by dividing the exterior body 6 into substantially half when viewed from the spout 3 side and have the same shape, the pulp mold molding 5a side will be described here.

  The pulp mold molded body 5a is a paper fiber laminated body formed by pouring a pulp fiber dispersed in water into a slurry mold (female mold) and suctioning the negative pressure from the outside of the female mold. It is a shell-shaped member molded by a general pulp mold molding method, which is dehydrated and dried by natural drying, hot air drying, hot press using a male mold, or the like. As the pulp fiber, for example, pure pulp made from plants such as straw and kenaf, and recycled pulp made from used paper are used.

  Joining pieces 13a to 13e are integrally formed outward on the joining surface 12 of the pulp mold molded body 5a. The pulp mold molded bodies 5a and 5b are integrated by bonding to form the exterior body 6. However, since the thickness of the pulp mold molded bodies 5a and 5b is about 1.5 to 2 mm, only the joint surface 12 is used as the adhesive surface. Since the bonding area is small, the bonding strength is weak, and the bonding surface may be peeled off due to impact during transportation. Therefore, by using the bonding pieces 13a to 13e as the bonding surfaces in addition to the bonding surface 12, it is possible to increase the bonding area and increase the bonding strength of the pulp mold molded bodies 5a and 5b.

  If the pulp mold molded bodies 5a and 5b are bonded in the state shown in FIG. 4, the joining pieces 13a to 13e protrude from the exterior body 6 and the exterior body 6 looks worse. Therefore, in this invention, as shown in FIG. 6, it adhere | attaches in the state by which the joining pieces 13a-13e were bend | folded inside the pulp mold molding 5a, 5b. According to this method, the pulp mold molded bodies 5a and 5b can be firmly bonded and fixed, and the appearance of the joined portion is also improved. Furthermore, if the surface of the exterior body 6 is packaged with a shrink film subjected to desired printing, the unevenness of the joint portion can be eliminated in addition to the improvement in design, and the joint strength of the exterior body 6 is also improved.

  As an adhesive used for bonding the pulp mold molded bodies 5a and 5b, various adhesives such as an ethylene-vinyl acetate copolymer (EVA) system capable of bonding paper to each other, or a dry laminate system as described above. An adhesive can be used. In particular, if a dry laminate adhesive layer is previously formed on the bonding surfaces 12 and the bonding surfaces of the bonding pieces 13a to 13e by applying a dry laminating adhesive, the pulp mold molded bodies 5a and 5b are only heated and pressed. Can be firmly bonded, and the drying process is unnecessary, so that the production efficiency of the composite container 1 is improved.

  Moreover, although the joining pieces 13a-13e were formed in five places of the joining surface 12 here, what is necessary is just to change suitably the magnitude | size and number of joining pieces according to the shape of the pulp mold moldings 5a and 5b. Moreover, if a perforation or a half-cut line is inserted in the boundary portion between the joining surface 12 and the joining pieces 13a to 13e, the bending work is facilitated. Furthermore, when providing a joining piece in the curve part of pulp mold molding 5a, 5b, it is preferable to divide | segment into a several joining piece by a slit and to make it easy to bend.

  By the way, when molding the pulp mold molded bodies 5a and 5b, it is necessary to consider the draft from the mold. Therefore, it is difficult to form the lower surfaces 14 of the pulp mold molded bodies 5a and 5b horizontally, and when the exterior body 6 is formed, the bottom surface becomes a convex surface. Therefore, it is desirable to process the lower surface 14 into a substantially horizontal or concave surface by a pressing process or the like when the joining pieces 13a to 13e are bent, or to cut out the center of the bottom surface to improve the sitting of the composite container 1.

  Next, the manufacturing process of the composite container of this embodiment will be described. First, the inner container 4 is manufactured by fusing the previously formed bag 2 and spout 3 by heat sealing or the like. On the other hand, pulp mold molded bodies 5a and 5b are manufactured by a pulp mold molding method. In addition, all the joining pieces 13a to 13e of the pulp mold molded bodies 5a and 5b are bent inward, and a dry laminate adhesive is applied to the joining surfaces 12 and the joining surfaces of the joining pieces 13a to 13e.

  Next, after filling the bag 2 with a predetermined amount of liquid, gel or powder contents from the spout 3, a screw cap 7 is attached to the spout 3 and the inner container 4 is sealed. And after covering the pulp mold moldings 5a and 5b so as to sandwich the inner container 4 from both sides of the side, and fitting the notches 10 of the upper end portions 8a and 8b to the fitting portion 9 of the spout 3, the pulp The molded body 5a, 5b is pressure-bonded and the exterior body 6 is mounted, and the composite container 1 is manufactured.

  According to this method, since the contents are filled before the exterior body 6 is mounted, there is a risk that the contents will scatter during the filling operation and stains, dirt, mold, etc. may be generated on the exterior body 6 made of pulp mold. This eliminates the manufacturing yield. If necessary, a label may be attached to the exterior body 6 or a shrink film may be attached to a part or the whole of the composite container 1.

  FIG. 7 is a side cross-sectional view of the composite container according to the second embodiment of the present invention. Portions common to FIG. 1 of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, the exterior molded body 6 is formed by covering the pulp mold molded bodies 5 a and 5 b from the vertical direction of the inner container 4.

  According to this embodiment, the bottom surface of the pulp mold molded body 5b constituting the lower part of the exterior body 6 can be formed flat, and the stability when the composite container 1 is placed without post-processing is improved. To do. Since the assembly method of the composite container 1 is substantially the same as in the first embodiment, the description thereof will be omitted, but it is necessary to cover the pulp mold molded body 5a constituting the upper part of the exterior body 6 from the upper side of the spout 3. Therefore, the fitting mechanism as in the first embodiment cannot be adopted.

  Therefore, as shown in FIG. 7, the hook portion 3 b is detachable, and after fitting the polygonal opening 15 formed in the pulp mold molded body 5 a into the fitting portion 9 having a polygonal cross section of the spout 3, By attaching the flange 3 b to the outer peripheral surface of the spout 3, the spout 3 and the exterior body 6 can be fixed. There is no particular limitation on the mounting method of the flange 3b. For example, if a screw-in fixing type using the thread 3a of the spout 3 is used, the flange 3b can be easily removed at the time of disposal, and the inner container 4 and the outer body 6 Can be separated. In the present embodiment, the inner diameter of the opening 15 (the outer diameter of the fitting portion 9) is set to the screw thread 3a so that the screw thread 3a does not interfere when the opening 15 of the pulp molded body 5a is fitted into the fitting portion 9. It is necessary to form larger than the outer diameter.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, instead of the screw cap 7, a spout 3 having a cap part integrally formed via a hinge part can be used. In this case, the cross-sectional shape of the fitting portion 9 may be circular. In addition, by combining a plurality of types of exterior bodies 6 with one type of bag body 2, the shape of the composite container 1 can be varied.

  The present invention comprises a bag formed of a laminate including at least a base material layer and a thermoplastic resin layer as the innermost layer, and a cylindrical spout fixed to the open end of the bag. The container is a composite container in which a container and an exterior body composed of a pair of pulp mold moldings that cover the outer surface of the inner container excluding a part of the spout are integrated. As a result, it is possible to provide a composite container that has a simple structure and is excellent in design and recyclability, and that can reliably prevent contamination of the exterior body when filling the contents.

  In addition, a joined piece is formed on the joined surface of the pulp mold molded body, the joined piece is bent inward, and the joined surface and the joined pieces are bonded to each other, so that the smoothness of the surface of the exterior body is not impaired. They can be firmly bonded together.

  Moreover, since the fitting part which regulates rotation of the spout with respect to an exterior body was formed in the outer peripheral surface of a spout and a pulp mold molded object was fitted, it becomes a composite container excellent in the usability at the time of screw cap attachment. .

These are side surface sectional drawings of the composite container which concerns on 1st Embodiment of this invention. These are exploded sectional views of the vicinity of the spout in the composite container of the first embodiment. These are the exploded top views of the periphery of the spout in the composite container of 1st Embodiment. These are the side views which looked at the pulp mold molded object which comprises the exterior body of the composite container of 1st Embodiment from the joint surface side. These are the longitudinal cross-sectional views of a pulp mold molding. These are the side views which looked at the state which bent the joining piece of the pulp mold molding from the joining surface side. These are side surface sectional drawings of the composite container which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite container 2 Bag body 3 Outlet 3a Screw thread 3b, 3c collar part 4 Inner container 5a, 5b Pulp molding molded body 6 Exterior body 7 Screw cap 8a, 8b Upper end part 9 Fitting part 10 Notch part 11 Perforation 12 Bonding surfaces 13a to 13e Bonding piece 14 Lower surface 15 Opening

Claims (7)

An inner container comprising: a bag formed of a laminate including at least a base material layer and a thermoplastic resin layer as the innermost layer; and a cylindrical spout fixed to the opening end of the bag. ,
And the outer body consists of a pair of the pulp molded body that covers the outer surface of the inner container, excluding the part of the spout, Ri formed by the integration,
At least one joining piece is integrally formed on the joining surface of each of the pulp mold moldings, and the joining piece is bent to the inside of the pulp mold molding to bond the joining surface and the opposing joining pieces to each other. A composite container in which the outer package is formed . 2. The composite container according to claim 1, wherein a fitting portion that regulates rotation of the pouring port with respect to the exterior body is formed on the outer peripheral surface of the pouring port while the pulp mold molded body is fitted . The composite container according to claim 2, wherein a cross-section of the fitting portion has a shape having at least one straight line portion or an elliptical shape . The composite container according to claim 3, wherein a cross section of the fitting portion is a polygonal shape . The pulp molded body, the watch composite container according to any one of claims 1 to 4, characterized in that as viewed from the outlet side is a shape divided into approximately half the outer body. The composite container according to any one of claims 1 to 4 , wherein the pulp mold molded body has a shape obtained by dividing the exterior body into the spout side and the bag side . The composite container according to any one of claims 1 to 6 , wherein a perforation that allows part of the pulp mold molded body to be broken and the spout to be removed is formed .

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