WO2018124171A1 - 筒状容器およびその製造方法 - Google Patents
筒状容器およびその製造方法 Download PDFInfo
- Publication number
- WO2018124171A1 WO2018124171A1 PCT/JP2017/046867 JP2017046867W WO2018124171A1 WO 2018124171 A1 WO2018124171 A1 WO 2018124171A1 JP 2017046867 W JP2017046867 W JP 2017046867W WO 2018124171 A1 WO2018124171 A1 WO 2018124171A1
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- WIPO (PCT)
- Prior art keywords
- cylindrical
- shrink film
- cylindrical container
- film
- peripheral surface
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
- B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/12—Cans, casks, barrels, or drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/20—External fittings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/34—Coverings or external coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
- B65D3/04—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially cylindrical
Definitions
- the present invention relates to a cylindrical container in which a body portion of a container is covered with a shrink film, and particularly relates to a cylindrical container in which the coated shrink film is less likely to be displaced from the body portion and to be manufactured.
- the diameter changes, for example, when an uneven pattern is formed on the side surface of the cylindrical portion of the cylindrical container body, or when the end portion as disclosed in Patent Document 1 is narrowed.
- the shrinkable shrink film is brought into a state of being in close contact with and locked to the side surface of the body portion along the shape, so that there is little possibility that the shrink film is displaced or detached after the close contact.
- the shrink film is shrunk and adhered to the side of the body.
- the shrink film since there is no structure for locking, the shrink film may be displaced from the cylindrical container body or may come off depending on variations in manufacturing and handling methods.
- the length of the shrink film 100 in the axial direction of the cylindrical container is made longer than the body side surface 120 so as to protrude from both ends, and the protruding portion is strongly shrunk by the heater 41 or the like.
- a winding portion 102 wound inside the end portion is provided, or sealing is performed on the end portion side.
- cylindrical containers mainly made of paper are difficult to form irregularities on the side surface of the body by molding, such as plastic, because of the material properties, and many of them have a side surface of the body that has no irregularities.
- molding such as plastic
- the shrink film is necessary and wasteful than the originally required length, and it is necessary to separately set the heating conditions for the part to be wrapped inside and sealed, or when shrinking There was a problem that it looked bad because of wrinkles.
- the present invention was made to solve the above-described problems of the prior art, and when the shrink film is attached to a cylindrical container that does not have a structure for locking the shrink film such as irregularities on the side surface of the trunk, Provided are a cylindrical container that is mounted without wastefully using a shrink film in order to prevent it from coming off, and has a good appearance, and a method for manufacturing the same.
- a cylindrical container includes a cylindrical container main body having a cylindrical trunk, and a cylindrical shrink film that covers and tightly covers an outer peripheral surface of the trunk.
- the barrel portion and the cylindrical shrink film are bonded with a hot melt adhesive at least at one end edge portion.
- the hot melt adhesive may be applied with an outer diameter of 5 mm or more and 15 mm or less and an application thickness of 2 mm or less.
- at least the first resin layer, the barrier layer, the paper layer, and the second resin layer may be stacked in order from the inner peripheral surface side of the body portion.
- the manufacturing method of the cylindrical container according to the second aspect of the present invention includes an application step of applying a hot melt adhesive to at least one edge portion of the outer peripheral surface of the cylindrical body of the cylindrical container body, In the circumferential direction of the body portion, the cylindrical shape is combined with the position where the hot melt adhesive is applied and the position of the ridge line portion of the cylindrical shrink film which is flattened to form the ridge line portion.
- an adhesion step of adhering the body portion and the cylindrical shrink film with the hot melt adhesive is provided to the hot melt adhesive.
- disconnects a long cylindrical shrink film continuous body, and has the said cylindrical shrink film which has the length equivalent to the length of the center axis direction of the said trunk
- the region to which the hot melt adhesive is applied may have an outer diameter of 5 mm or more and 15 mm or less, and the application thickness of the hot melt adhesive may be 2 mm or less.
- the cylindrical container which concerns on the 3rd aspect of this invention is the cylinder which has the cylindrical trunk
- the cylindrical container manufacturing method according to the fourth aspect of the present invention is a cylindrical body portion in which at least a first resin layer, a barrier layer, a paper layer, and a second resin layer are laminated in order from the inner peripheral surface side.
- a cylindrical container manufacturing method comprising: a cylindrical container body including: a cylindrical shrink film that tightly covers and covers an outer peripheral surface of the barrel portion; and the cylindrical shrink film is externally fitted to the barrel portion.
- the outer fitting step, the cylindrical container body and the cylindrical shrink film are heated at a first temperature higher than the softening temperature of the second resin layer, and the cylindrical shrink film is shrunk to An adhesion process for closely contacting the outer peripheral surface.
- the first temperature may be 170 ° C. or higher, and the softening temperature may be 80 ° C. or lower.
- the manufacturing method of the cylindrical container which concerns on the said 4th aspect WHEREIN: The 2nd temperature lower than the said 1st temperature is used for the whole said trunk
- the method may further include a preparation heating step of heating, and the second temperature may be equal to or higher than a softening temperature of the second resin layer.
- the second temperature may be 80 ° C. or higher.
- the cylindrical shrink film having a length equivalent to the length in the central axis direction of the trunk portion is cut by cutting a continuous cylindrical shrink film. You may further provide the cutting process to form.
- a cylindrical container according to a fifth aspect of the present invention has a cylindrical body part, and a lid part and a bottom part that respectively seal both end parts of the body part, and a discharge port for contents is formed in the lid part.
- the cylindrical container main body and the cylindrical shrink film having a film bonding portion while closely covering and covering the outer peripheral surface of the barrel portion, the film bonding portion of the outer peripheral surface of the barrel portion, It arrange
- the said film junction part may be formed by welding two places of at least 1 film.
- at least the first resin layer, the barrier layer, the paper layer, and the second resin layer may be stacked in order from the inner peripheral surface side of the body portion.
- a method for manufacturing a cylindrical container according to a sixth aspect of the present invention includes a cylindrical body part, and a lid part and a bottom part for sealing both ends of the body part, respectively, and a discharge port for contents in the lid part
- a tubular container manufacturing method comprising: a tubular container body formed with a cylindrical shrink film having a film joint portion while closely covering an outer peripheral surface of the body portion, the film joint portion Is disposed on the opposite side of the outer peripheral surface of the body portion on the opposite side of the portion where the gap between the discharge port and the outer peripheral edge of the lid portion is the narrowest.
- An outer fitting step of fitting the cylindrical shrink film to the barrel portion in alignment with the cylindrical shrink film, heating the cylindrical container body and the cylindrical shrink film, and Shrink the film It comprises an adhesion step of adhering to the outer peripheral surface of the.
- the manufacturing method of the cylindrical container which concerns on the said 6th aspect may further be equipped with the film welding process which welds two places of at least 1 film using a solvent, and forms the said film junction part.
- the cylindrical shrink film having a length equivalent to the length in the central axis direction of the trunk portion is obtained by cutting a continuous tubular shrink film continuous body. You may further provide the cutting process to form.
- the cylindrical shrink film is formed only on the side surface of the barrel, even if the barrel side surface is smooth without unevenness and has no structure for locking the shrink film. Since it is bonded by the hot melt adhesive provided at the edge, it can provide a cylindrical container with a clean appearance without the risk of the shrink film slipping or coming off, especially like a cylindrical container mainly made of paper Even in the case of a cylindrical container in which it is difficult to provide unevenness on the side surface of the body part, it is possible to obtain a cylindrical container that does not use an extra shrink film for winding a shrink film. Moreover, the cylindrical container provided with a favorable adhesive force without the hot melt adhesive being conspicuous and without protruding too much from the side surface of the body portion can be obtained. *
- the cylindrical container and the cylindrical shrink film are bonded to prevent the cylindrical shrink film from being displaced or detached.
- the cylindrical container and the cylindrical shrink film After aligning the position of the hot melt adhesive and the ridgeline part of the tubular shrink film, it can be smoothly fitted by fitting the tubular shrink film, and it is hot when heating to shrink the tubular shrink film.
- the melt adhesive can be melted at the same time to bond the barrel side surface and the cylindrical shrink film, and therefore a cylindrical container can be efficiently manufactured without requiring a separate process.
- sufficient adhesive strength can be obtained without the hot melt adhesive being conspicuous and without protruding from the side surface of the body portion.
- a practical holding strength between the cylindrical shrink film and the body portion can be ensured without using a hot melt adhesive.
- the film joining portion is disposed on the opposite side of the outer peripheral surface of the trunk portion from the discharge port proximity portion, the user discharges the contents.
- the user's mouth can be prevented from coming into contact with the film junction.
- the influence on the user can be eliminated.
- the beautiful printing which is not influenced by a film junction part can be shown to a user.
- the user's mouth does not contact the film joining portion, so the user's discomfort can be reduced.
- FIG. 1 is a perspective view showing a cylindrical container of the present embodiment.
- FIG. 2 is a longitudinal sectional view of the cylindrical container of the present embodiment.
- FIG. 3 is a plan view of a part of the cylindrical container according to the present embodiment as viewed from above, and a partial cross-sectional plan view.
- FIG. 4 is a schematic cross-sectional view showing an example of a laminated material constituting the cylindrical container body. is there.
- the plan view is a view as seen from the direction of the central axis O of the body portion described later.
- the cylindrical container 1 includes a cylindrical container body 2 having a cylindrical body portion 16 and a cylindrical shrink film 13 that covers the outer peripheral surface of the body portion 16 in close contact.
- the barrel portion 16 and the tubular shrink film 13 are bonded to each other with a hot melt adhesive at at least one end edge portion of the barrel portion 16.
- the cylindrical container body 2 includes a cylindrical body portion 16, a disc-shaped lid portion 17 whose circular outer peripheral edge stands up outward, and a disc And a bottom 18 having a circular outer peripheral edge standing outwardly. That is, the cylindrical container body 2 includes a body portion 16, a lid portion 17 and a bottom portion 18 that seals both end portions of the body portion 16.
- the side on which the lid portion 17 is provided is referred to as the upper portion
- the side on which the bottom portion 18 is provided is referred to as the lower portion.
- the lid portion 17 is formed with a discharge port 17 a (a user's drinking port) for contents.
- the discharge port 17a is sealed with a detachable tab material 19.
- the outer peripheral edge portion of the lid portion 17 is joined to the upper inner surface of the trunk portion 16, and the upper edge of the trunk portion 16 is bent radially inward so as to cover the standing portion of the lid portion 17.
- the inner surface of the outer peripheral edge portion of the bottom portion 18 is joined to the lower inner surface of the bottom portion 16, and the lower end edge of the body portion 16 is bent radially inward so as to cover the standing portion of the bottom portion 18.
- the lid portion 17, the body portion 16, and the bottom portion 18 of the cylindrical container body 2 of the present embodiment are arranged in order from the inner peripheral surface side, the first resin layer 31, the barrier layer 32, and the third resin layer. 33, a paper layer 34, and a second resin layer 35 are laminated. If the barrier layer 32 can be directly laminated on the paper layer 34, the third resin layer 33 may not be provided. That is, at least the first resin layer 31, the barrier layer 32, the paper layer 34, and the second resin layer 35 may be laminated in order from the inner peripheral surface side.
- the cover part 17 and the bottom part 18 may be comprised with the plastic plate, the metal plate, etc. other than such a structure, for example.
- the first resin layer 31 is a resin that is exposed on the inner surface of the container and comes into contact with food, and has a heat-fusion property or a heat-adhesive property with the second resin layer 35.
- Polyolefin resin such as polymer (EAA), ethylene-methyl methacrylate copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-propylene copolymer, methylpentene polymer, polyethylene or polypropylene is acrylic.
- An acid-modified polyolefin resin modified with an unsaturated carboxylic acid such as acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid or itaconic acid can be used.
- the thickness of the first resin layer 31 is, for example, about 30 to 100 ⁇ m.
- the second resin layer 35 can be selected according to the purpose and is not particularly limited.
- polyethylene resin, polypropylene resin, polyester resin, ethylene-based copolymer resin, polyamide resin (nylon 6, nylon 66, etc.), polyvinyl chloride, and the like can be given.
- the material of the second resin layer 35 may be the same as that of the first resin layer 31.
- low density polyethylene LDPE
- linear low density polyethylene LLDPE
- polypropylene PP
- ethylene-vinyl acetate copolymer EAA
- EAA ethylene-acrylic acid copolymer Polymers
- EAA ethylene-methyl methacrylate copolymers
- EAA ethylene-ethyl acrylate copolymers
- EA ethylene-ethyl acrylate copolymers
- the paper layer 34 is a layer made of paper, can be selected according to the purpose, and is not particularly limited. For example, by using domestic thinned wood as a raw material for the paper layer 34, a container in consideration of environmental conservation can be manufactured.
- the barrier layer 32 is a layer for imparting gas barrier properties and water vapor barrier properties to the cylindrical container body 2.
- a material of the barrier layer 32 an aluminum foil, an aluminum vapor deposition film, a metal oxide vapor deposition film, an ethylene vinyl alcohol copolymer resin, a vinylidene chloride film, a polyvinyl alcohol film, or the like can be preferably used.
- the first resin layer 31, the paper layer 34, the third resin layer 33, the barrier layer 32, and the second resin layer 35 are laminated using a known method such as a melt extrusion lamination method or a dry lamination method. Can do. Moreover, in bonding each layer, an adhesion improving process such as a corona discharge process or an anchor coat process can be performed as necessary. An additional layer may be provided between the plurality of layers.
- the cylindrical body portion 16 is formed by heat-sealing the second resin layer 35 in the radially outermost layer and the first resin layer 31 in the radially innermost layer at the body joint portion 16a. Further, the body joint part 16 a is provided with an edge protection tape 16 b that covers the edge of the laminate constituting the body 16.
- the cylindrical shrink film 13 of this embodiment consists of one sheet.
- the cylindrical shrink film 13 is formed from a resin film that shrinks when heated, and for example, a thermoplastic resin film that shrinks when heated at 170 ° C. or higher is used.
- a thermoplastic resin film that shrinks when heated at 170 ° C. or higher is used.
- a polystyrene resin such as an OPS film (registered trademark) can be used.
- the single-layer cylindrical shrink film 13 is used, but the shrink film may have a laminated structure.
- the cylindrical shrink film 13 has the film junction part 13a while sticking and covering the outer peripheral surface of the trunk
- the film bonding part 13a is formed by welding at least two places of one film using a solvent. Note that the film bonding portion 13a may be formed using an adhesive if sufficient bonding strength can be ensured.
- the film bonding portion 13 a is the reverse of the portion (discharge port proximity portion 17 b) in the outer peripheral surface of the body portion 16 where the gap G between the discharge port 17 a and the outer peripheral edge of the lid portion 17 is the narrowest. Arranged on the side. More specifically, as shown in FIG. 3, the range from 90 ° to 270 ° means “reverse side”, with the position of the discharge port proximity portion 17b being 0 ° around the central axis of the body portion 16, The film bonding portion 13a is disposed in this range.
- the cylindrical shrink film 13 may be formed by joining two or more films, and a plurality of film joining portions may be provided.
- the cylindrical shrink film 13 is formed by bonding two edges of one film with a solvent to form a cylinder, and then flattened and wound on a roll. It is unwound. Therefore, the both sides of the cylindrical shrink film 13 are creased and have ridge lines 12 projecting outward at both ends of the cylindrical diameter direction.
- printing is performed not on the cylindrical container body 2 but on the cylindrical shrink film 13.
- known methods such as flexographic printing and gravure printing can be used.
- flexographic printing it is possible to reduce the trouble of switching the print design as compared with the case of printing on a conventional container body.
- the water-based ink is used for the printing to the cylindrical shrink film 13, and an environmental load can be reduced.
- a solvent capable of welding a film can be appropriately used.
- a mixture of ethyl acetate and cyclohexane (mixing ratio 17:83) can be used.
- the cylindrical shrink film 13 and the body portion 16 are joined by a hot melt adhesive in one place, so that the tubular shrink film 13 can be easily separated from the body portion 16, It is possible to reduce the labor of sorting.
- the film joining part 13a is arrange
- the user's mouth can be prevented from coming into contact with the film bonding portion 13a. For this reason, even if the solvent remains in the film bonding portion 13a, the influence on the user can be eliminated.
- the beautiful printing which is not influenced by the film joining part 13a can be shown to a user.
- FIG. 5A and FIG. 5B are schematic views showing how the cylindrical shrink film 13 is attached to the cylindrical container body 2 of the cylindrical container of the present embodiment.
- the manufacturing method of the cylindrical container according to the present embodiment includes an application step of applying a hot melt adhesive to at least one end edge portion of the outer peripheral surface of the cylindrical trunk portion of the cylindrical container body, In the circumferential direction, align the position where the hot melt adhesive is applied and the position of the ridge line portion of the cylindrical shrink film that is flattened to form the ridge line portion, and the cylindrical shrink film is placed in the body portion.
- the manufacturing method of the present embodiment includes a cutting step of cutting a continuous tubular shrink film continuous body to form a tubular shrink film having a length equivalent to the length of the trunk portion in the central axis direction.
- the cylindrical container body 2 has a smooth cylindrical shape with no irregularities on the body side surface 20 of the body part 16, and a hot melt adhesive 21 is applied to one part of the edge part, so that part is hot melt bonded. The thickness of the agent 21 slightly protrudes.
- the hot melt adhesive 21 When the hot melt adhesive 21 is applied so as to have an outer diameter of 5 mm or more and 15 mm or less and a coating thickness of 2 mm or less in the radial direction when viewed from the radial direction of the body portion 16, sufficient adhesive strength can be obtained. This is preferable because it does not get in the way when a tubular shrink film 13 to be described later is externally fitted. Furthermore, the positional shift of the cylindrical shrink film 13 can be suitably prevented by setting the coating thickness to 0.5 mm or more.
- the cylindrical shrink film 13 is flattened and unwound from the state wound on the roll 10, cut into a length equivalent to the height T of the body side surface 20, and supplied. .
- the opening 11 is formed and becomes a cylindrical shape.
- both sides have creases, and the diameter of the cylindrical shape is also reduced.
- Ridge line portions 12 projecting in an outer shape remain at both ends in the direction.
- the cylindrical shrink film 13 has a diameter slightly larger than the diameter of the cylindrical container body 2 in a state where the cylindrical shrink film 13 is spread in a cylindrical shape, and can be externally fitted to the cylindrical container body 2.
- the protruding portion of the hot melt adhesive 21 can be stored in a substantially triangular space formed inside the ridge line portion 12, It is possible to reduce the possibility that the cylindrical shrink film 13 is caught on the hot melt adhesive 21 and is displaced or wrinkled when sold outside.
- the length of the cylindrical shrink film 13 is equal to the height T of the body side surface 20 as shown in FIG. 5B, an extra length is unnecessary and efficient.
- the film joining portion 13 a is arranged on the opposite side of the outer peripheral surface of the body portion 16 where the gap G between the discharge port 17 a and the outer peripheral edge of the lid portion 17 is the narrowest.
- the cylindrical shrink film 13 is fitted on the trunk portion 16 by aligning the positions of the trunk portion 16 and the cylindrical shrink film 13 in the circumferential direction of the trunk portion 16.
- the tab material 19 is image-recognized, the position of the body part 16 in the circumferential direction can be acquired, and the position of the body part 16 can be adjusted as appropriate. .
- the position of the body portion 16 may be acquired from the position of the body portion joint portion 16a.
- FIGS. 7A and 7B are enlarged views of a portion of the hot melt adhesive 21 in a cross section obtained by cutting the cylindrical container body 2 in the state of FIG.
- the tubular shrink film 13 is heated by heating the whole in a state where the hot melt adhesive 21 is positioned in the substantially triangular space formed inside the ridge line portion 12 and the tubular shrink film 13 is externally fitted. It shrinks and adheres to the body side surface 20 as shown in FIG. 7B.
- the ridgeline portion 12 disappears by shrinking, and at the same time, the hot melt adhesive 21 is melted to bond the cylindrical shrink film 13 and the body side surface 20.
- FIG. 8A and FIG. 8B are longitudinal cross sections of the hot-melt adhesive 21 of the cylindrical container 1 after heating.
- the tubular shrink film 13 is in close contact with the body side surface 20, and the hot melt adhesive 21 is raised by the thickness, but there is no particular problem in handling as long as it is about 2 mm or less. Since the ridge line portion 12 can be formed on both sides of the cylindrical shrink film 13 in the diametrical direction, the hot melt adhesive 22 is also placed at a position facing the hot melt adhesive 21 of the container body 2 in the diametrical direction accordingly, as shown in FIG. 8B. It may be provided. By providing two places, the adhesion between the body side surface 20 and the tubular shrink film 13 can be made more surely strong.
- FIG. 9 is a schematic diagram of a process for producing the cylindrical container of the present invention.
- the shrink film 14 crushed flat and wound on the roll 10 is unwound from the roll 10, and the height of the barrel side surface 20 of the cylindrical container body 2 with the cutter 30 (the cylindrical shape). It is cut into a length equivalent to the length in the axial direction) to form a small shrink film 15.
- the shrink film 14 may be preliminarily printed 16 with characters, symbols, and the like.
- the opening 11 of the small-sized shrink film 15 is expanded to form a cylindrical shrink film 13.
- the hot melt adhesive 21 is sprayed from the nozzle 50 to the edge of the barrel side surface on the cylindrical container body 2, and then the cylindrical shrink film 13 is aligned with the ridgeline portion 12 and the hot melt adhesive 21. Moreover, it is set as the externally fitted aspect 25. Subsequently, the whole is heated by a heater 40 such as a heating furnace so that the cylindrical shrink film 13 is contracted and closely adhered to the cylindrical container body 2, and at the same time, the cylindrical shrink film 13 is barreled by the hot melt adhesive 21. It adheres to a side surface and obtains the cylindrical container 1 of this invention.
- a heater 40 such as a heating furnace
- cylindrical container has been described as an example of a cylindrical container.
- the same configuration can be used for other cylindrical cylindrical containers, and the same manufacturing method can be used. Can be manufactured.
- the cylindrical container of the present invention obtained as described above and the manufacturing method thereof can be applied to a cylindrical container mainly composed of various materials such as plastic, metal, glass, paper, and the side surface of the body portion to be covered with a shrink film. Because the same size cylindrical shrink film is used, there is no waste and the hot film adhesive applied to the edge part adheres the shrink film and the barrel side of the cylindrical container body so that the shrink film may slip or come off.
- the present invention can be suitably applied to a cylindrical container mainly made of paper that is difficult to be provided with an uneven pattern on the side surface of the body portion, and can be applied as a manufacturing method.
- the cylindrical container according to the present embodiment is different from the first embodiment in that the body portion 16 and the cylindrical shrink film 13 are not bonded with the hot melt adhesive 21.
- the configuration shown in FIGS. 1 to 4 is also used in the second embodiment. The description of the same configuration as that of the first embodiment is omitted.
- the shrink temperature of the cylindrical shrink film 13 is higher than the softening temperature of the second resin layer 35.
- the shrink temperature of the cylindrical shrink film 13 is 170 ° C. or higher
- the softening temperature of the second resin layer 35 is 80 ° C. or lower.
- the shrink temperature refers to a temperature that is set on the film itself and that can perform appropriate shrink.
- the softening temperature is a temperature at which the second resin layer 35 softens, and indicates a temperature at which the shape is maintained when cooled after being softened and changed in shape.
- the cylindrical shrink film 13 shrinks, the second resin layer 35 softens, and the shape of the inner peripheral surface of the cylindrical shrink film 13 and fine irregularities are reduced.
- the second resin layer 35 and the shrink film 13 are firmly adhered to each other by being deformed along. That is, in this embodiment, practical holding strength can be ensured without using a hot melt adhesive. For this reason, the cylindrical shrink film 13 can be easily separated from the trunk portion 16, and the labor of sorting can be reduced.
- the manufacturing method of the cylindrical container 1 which concerns on this embodiment is demonstrated.
- the second resin layer 35 includes the outer fitting process of fitting the cylindrical shrink film 13 to the body portion 16, the cylindrical container body 2 and the cylindrical shrink film 13. And a close contact step in which the cylindrical shrink film 13 is shrunk and is brought into close contact with the outer peripheral surface of the body portion 16 by heating at a first temperature higher than the softening temperature.
- the manufacturing method of this embodiment differs from 1st embodiment by the point which has a preparatory heating process (after-mentioned) and a contact
- the manufacturing method of the present embodiment further includes a preparatory heating step of heating the entire body portion 16 to which the tubular shrink film 13 is externally fitted at a second temperature lower than the first temperature before the adhesion step. .
- the cylindrical container 1 after the external fitting process is heated at a temperature equal to or higher than the softening temperature of the second resin layer 35 as the second temperature.
- the cylindrical container 1 after a preheating process is heated by the temperature more than the shrink temperature of the shrink film 13 as 1st temperature.
- the first temperature is 170 ° C. or higher
- the softening temperature of the second resin layer 35 is 80 ° C. or lower.
- the second temperature may be 80 ° C.
- the second resin layer 35 is softened and deformed along the shape of the inner peripheral surface of the cylindrical shrink film 13 and fine irregularities, so that the second resin layer 35 and the shrink The film 13 adheres firmly. That is, in this embodiment, practical holding strength can be ensured without using a hot melt adhesive.
- the Example using the manufacturing method of the cylindrical container which concerns on 2nd embodiment is shown below.
- a low-density polyethylene resin (LDPE) was extruded and laminated to a surface of paper having a basis weight of 200 g / m 2 to a thickness of 50 ⁇ m to form a second resin layer.
- PET polyethylene terephthalate resin
- barrier layer gas barrier film
- ⁇ Vibration test> One vibration test of the physical property test was performed on the container obtained in the above example, and it was confirmed whether the shrink film was not torn, damaged or the like, and it did not affect the leakage of the cylindrical container.
- a cylindrical container having a diameter of ⁇ 53 mm, a height of 112 mm, and a capacity of 195 ml was accommodated in a corrugated cardboard having a length of 325 mm ⁇ width of 275 mm ⁇ height of 125 mm.
- a cylindrical container having a diameter of ⁇ 48 mm, a height of 95 mm, and a capacity of 125 ml was accommodated in a corrugated cardboard having a length of 305 mm ⁇ width of 255 mm ⁇ height of 100 mm.
- These cardboards were subjected to a vibration test based on JIS Standard Packaged Cargo-Evaluation Test Method General Rules Z 0200-1994. Specifically, it was subjected to a vibration test using a vibration tester (manufactured by Senken Co., Ltd.) with a vibration acceleration of 0.75 G and an excitation time of 60 minutes (longitudinal vibration 30 minutes, lateral vibration 15 minutes ⁇ 2).
- the cylindrical container of this invention had appropriate contact
- the shrink temperature and the temperature in the preparatory heating process can be adjusted as appropriate. Further, the preheating step may be a constant temperature such as 80 ° C., for example. Moreover, if a shrink film can be shrunk appropriately, it is not necessary to perform a preparatory heating process only by the heating in a close_contact
- a cylindrical container can be formed using both the adhesion
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Abstract
Description
本願は、2016年12月27日に、日本に出願された特願2016-252576号に基づき優先権を主張し、その内容をここに援用する。
上記第一態様において、前記ホットメルト接着剤が外径5mm以上15mm以下、かつ塗布厚み2mm以下で塗布されていてもよい。
上記第一態様において、前記胴部は、その内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されていてもよい。
本発明の第二態様に係る筒状容器の製造方法は、筒状容器本体の、筒状の胴部の外周面における少なくとも端縁部の1箇所にホットメルト接着剤を塗布する塗布工程と、前記胴部の周方向において、前記ホットメルト接着剤が塗布されている位置と、平坦に潰されて稜線部が形成された筒状シュリンクフィルムの前記稜線部の位置とを合わせて、前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、前記筒状容器本体および前記筒状シュリンクフィルムを加熱して、前記筒状シュリンクフィルムをシュリンクさせて前記胴部の外周面に密着させるとともに、前記ホットメルト接着剤により前記胴部と前記筒状シュリンクフィルムとを接着する接着工程と、を備える。
上記第二態様に係る筒状容器の製造方法は、長尺の筒状シュリンクフィルム連続体を切断して、前記胴部の中心軸線方向の長さと同等の長さを有する前記筒状シュリンクフィルムを形成する切断工程をさらに備えてもよい。
上記第二態様において、前記ホットメルト接着剤を塗布する領域が外径5mm以上15mm以下であり、かつ前記ホットメルト接着剤の塗布厚みが2mm以下であってもよい。
本発明の第三態様に係る筒状容器は、内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されている筒状の胴部を有する筒状容器本体と、前記胴部の外周面を密着して覆う筒状シュリンクフィルムと、を備え、前記筒状シュリンクフィルムのシュリンク温度が、前記第2樹脂層の軟化温度よりも高い。
上記第三態様において、前記シュリンク温度は170℃以上であり、前記軟化温度は80℃以下であってもよい。
本発明の第四態様に係る筒状容器の製造方法は、内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されている筒状の胴部を有する筒状容器本体と、前記胴部の外周面を密着して覆う筒状シュリンクフィルムと、を備える筒状容器の製造方法であって、前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、前記筒状容器本体および前記筒状シュリンクフィルムを、前記第2樹脂層の軟化温度よりも高い第1温度で加熱して、前記筒状シュリンクフィルムをシュリンクさせて前記胴部の外周面に密着させる密着工程と、を備える。
上記第四態様において、前記第1温度は170℃以上であり、前記軟化温度は80℃以下であってもよい。
上記第四態様に係る筒状容器の製造方法は、前記密着工程よりも前に、前記筒状シュリンクフィルムが外嵌された前記胴部の全体を、前記第1温度よりも低い第2温度で加熱する準備加熱工程をさらに備え、前記第2温度は前記第2樹脂層の軟化温度以上であってもよい。
上記第四態様において、前記第2温度は80℃以上であってもよい。
上記第四態様に係る筒状容器の製造方法は、長尺の筒状シュリンクフィルム連続体を切断して、前記胴部の中心軸線方向の長さと同等の長さを有する前記筒状シュリンクフィルムを形成する切断工程をさらに備えてもよい。
本発明の第五態様に係る筒状容器は、筒状の胴部、並びに前記胴部の両端部をそれぞれ密閉する蓋部および底部を有し、前記蓋部に内容物の吐出口が形成された筒状容器本体と、前記胴部の外周面を密着して覆うとともに、フィルム接合部を有する筒状シュリンクフィルムと、を備え、前記フィルム接合部は、前記胴部の外周面のうちの、前記吐出口と前記蓋部の外周縁との間隔が最も狭い箇所の逆側に配置されている。
上記第五態様において、前記フィルム接合部は、少なくとも1枚のフィルムの2箇所が溶着されて形成されていてもよい。
上記第五態様において、前記胴部は、その内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されていてもよい。
本発明の第六態様に係る筒状容器の製造方法は、筒状の胴部、並びに前記胴部の両端部をそれぞれ密閉する蓋部および底部を有し、前記蓋部に内容物の吐出口が形成された筒状容器本体と、前記胴部の外周面を密着して覆うとともに、フィルム接合部を有する筒状シュリンクフィルムと、を備える筒状容器の製造方法であって、前記フィルム接合部が、前記胴部の外周面のうちの、前記吐出口と前記蓋部の外周縁との間隔が最も狭い箇所の逆側に配置されるように、前記胴部の周方向において前記胴部と前記筒状シュリンクフィルムとの位置を合わせて、前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、前記筒状容器本体および前記筒状シュリンクフィルムを加熱して、前記筒状シュリンクフィルムをシュリンクさせて前記胴部の外周面に密着させる密着工程と、を備える。
上記第六態様に係る筒状容器の製造方法は、少なくとも1枚のフィルムの2箇所を溶剤を用いて溶着して、前記フィルム接合部を形成するフィルム溶着工程をさらに備えていてもよい。
上記第六態様に係る筒状容器の製造方法は、長尺の筒状シュリンクフィルム連続体を切断して、前記胴部の中心軸線方向の長さと同等の長さを有する前記筒状シュリンクフィルムを形成する切断工程をさらに備えていてもよい。
また、吐出口が配置されている側にフィルム接合部がないため、フィルム接合部に影響されない綺麗な印刷を使用者に見せることができる。さらに、フィルム接合部に2つの縁部が接合することにより段差等が生じていたとしても使用者の口がフィルム接合部に接触しないので、使用者の不快感を低減できる。
以下、本発明の第一実施形態を図面を参照しながら詳細に説明する。なお本発明は以下の実施形態に限定して解釈されるものではない。
また、後述する製造方法で説明する通り、筒状シュリンクフィルム13は、1枚のフィルムの2つの縁部を溶剤で接着して筒状とし、その後平坦に潰されてロールに巻かれた状態から巻き出される。そのため、筒状シュリンクフィルム13の両側部には折り癖がついており、筒状の直径方向の両端に外側に張り出した稜線部12をそれぞれ有する。
なお、稜線部12やフィルム接合部13aには重要な情報(バーコードなど)を印刷しないことが好ましい。
また、吐出口17aが配置されている側にフィルム接合部13aがないため、フィルム接合部13aに影響されない綺麗な印刷を使用者に見せることができる。さらに、フィルム接合部13aに2つの縁部が接合することにより段差等が生じていたとしても使用者の口がフィルム接合部13aに接触しないので、使用者の不快感を低減できる。
図5A及び図5Bは、本実施形態の筒状容器の筒状容器本体2に筒状シュリンクフィルム13を装着する様子を示す模式図である。
本実施形態に係る筒状容器の製造方法は、筒状容器本体の、筒状の胴部の外周面における少なくとも端縁部の1箇所にホットメルト接着剤を塗布する塗布工程と、胴部の周方向において、ホットメルト接着剤が塗布されている位置と、平坦に潰されて稜線部が形成された筒状シュリンクフィルムの稜線部の位置とを合わせて、前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、筒状容器本体および筒状シュリンクフィルムを加熱して、筒状シュリンクフィルムをシュリンクさせて胴部の外周面に密着させるとともに、ホットメルト接着剤により胴部と筒状シュリンクフィルムとを接着する接着工程と、を備える。さらに、本実施形態の製造方法は、長尺の筒状シュリンクフィルム連続体を切断して、胴部の中心軸線方向の長さと同等の長さを有する筒状シュリンクフィルムを形成する切断工程を有する。
筒状容器本体2は胴部16の胴部側面20に凹凸が無く滑らかな円筒状であり、端縁部の1箇所にホットメルト接着剤21が塗布されているため、その部分はホットメルト接着剤21の厚み分だけわずかに突出している。ホットメルト接着剤21は、胴部16の径方向から見たときに、外径5mm以上15mm以下、かつ径方向の塗布厚み2mm以下となるよう塗布されていると十分な接着力を得ることができ、かつ後述する筒状シュリンクフィルム13を外嵌する際に邪魔にならず好適である。さらに、塗布厚みを0.5mm以上とすることで、筒状シュリンクフィルム13の位置ズレを好適に防止することができる。
また、外嵌工程において、フィルム接合部13aが、胴部16の外周面のうちの、吐出口17aと蓋部17の外周縁との間隔Gが最も狭い箇所の逆側に配置されるように、胴部16の周方向において胴部16と筒状シュリンクフィルム13との位置を合わせて、筒状シュリンクフィルム13を胴部16に外嵌する。外嵌工程における胴部16と筒状シュリンクフィルム13との位置決めでは、例えば、タブ材19を画像認識して、胴部16の周方向の位置を取得し、胴部16の位置を適宜調整できる。なお、胴部接合部16aの位置から胴部16の位置を取得してもよい。また、筒状シュリンクフィルム13の位置を調整してもよいし、筒状シュリンクフィルム13及び胴部16の位置をいずれも調整してもよい。
以下、本発明の第二実施形態を説明する。本発明の第二実施形態は、ホットメルト接着剤21を使用せずに、胴部16と筒状シュリンクフィルム13とを保持している。なお本発明は以下の実施形態に限定して解釈されるものではない。
本実施形態では、筒状シュリンクフィルム13のシュリンク温度が、第2樹脂層35の軟化温度よりも高い。例えば、筒状シュリンクフィルム13のシュリンク温度は170℃以上であり、第2樹脂層35の軟化温度は80℃以下である。
本実施形態において、シュリンク温度とは、フィルム自体に定められており適切なシュリンクが実施できる温度を示す。本実施形態において、軟化温度とは、第2樹脂層35が軟化する温度であり、軟化して形状を変えた後に冷却するとその形が維持される温度を示す。
本実施形態に係る筒状容器1の製造方法は、筒状シュリンクフィルム13を胴部16に外嵌する外嵌工程と、筒状容器本体2および筒状シュリンクフィルム13を、第2樹脂層35の軟化温度よりも高い第1温度で加熱して、筒状シュリンクフィルム13をシュリンクさせて胴部16の外周面に密着させる密着工程と、を備える。
本実施形態の製造方法は、第一実施形態の接着工程の代わりに、準備加熱工程(後述)及び密着工程を有する点で、第一実施形態とは異なる。即ち、本実施形態の外嵌工程は、第一実施形態の外嵌工程と同じでもよい。
本実施形態の製造方法は、密着工程よりも前に、筒状シュリンクフィルム13が外嵌された胴部16の全体を、第1温度よりも低い第2温度で加熱する準備加熱工程をさらに備える。準備加熱工程では、第2温度として、第2樹脂層35の軟化温度以上の温度で外嵌工程後の筒状容器1を加熱する。また、密着工程では、第1温度として、シュリンクフィルム13のシュリンク温度以上の温度で準備加熱工程後の筒状容器1を加熱する。本実施形態では、具体的に、第1温度は170℃以上であり、第2樹脂層35の軟化温度は80℃以下である。第2温度は80℃以上であってもよい。このように加熱温度を設定することにより、第2樹脂層35が軟化し、筒状シュリンクフィルム13の内周面の形状や微細な凹凸に沿って変形することで、第2樹脂層35とシュリンクフィルム13とが強固に密着する。つまり、本実施形態では、ホットメルト接着剤を使用せずとも実用的な保持強度を確保できる。
<シュリンク時の加熱温度の検証>
坪量200g/m2の紙の表面に、低密度ポリエチレン樹脂(LDPE)を厚さ50μmとなるように押し出しラミネートし、第2樹脂層とした。次に厚さ12μmのポリエチレンテレフタレート樹脂(PET)フィルムに酸化アルミニウムを蒸着したガスバリアフィルム(バリア層)と、紙の裏面とを、LDPE(第3樹脂層)45μmによって押し出しラミネートし、さらにガスバリアフィルムの紙とは逆側に、第1樹脂層としてLDPEを60μmの厚さになるように押し出しラミネートし、積層体とした。この積層体からΦ48mmの筒状容器本体を形成した。シュリンクフィルムとして、OPSフィルム DXL-270-41S 45μ(商標登録、三菱樹脂製)フレキソ印刷品、フィルム接着用の溶剤として、酢酸エチルとシクロヘキサンの混合物(混合比17:83)を用いた。シュリンク時の加熱条件は表1の通りである。送風のためのブロワーに用いた最大出力に対する割合を「ブロワー出力」として示す。
なお、表1の第1、第2工程が準備加熱工程に相当し、第3工程が、密着工程に相当する。
上記実施例で得られた容器において物性試験の1つの振動試験を行い、シュリンクフィルムの破け、破損等がないか、筒状容器の漏れに影響しないか確認をした。Φ53mm高さ112mm容量195mlの筒状容器を、縦325mm×横275mm×高さ125mmの段ボールに収容した。また、Φ48mm高さ95mm容量125mlの筒状容器を、縦305mm×横255mm×高さ100mmの段ボールに収容した。これらの段ボールをJIS規格 包装貨物-評価試験方法通則 Z 0200-1994 に基づく振動試験に供した。具体的には、振動試験機(株式会社振研製)を用いて、振動加速度0.75Gで、加振時間60分(縦振動30分、横振動15分×2)の振動試験に供した。
さらに、振動試験後、段ボールから取り出し、シュリンクフィルムからエアーの漏れが無いか目視検査を行った。その結果、60個全ての破れがないことを確認した。また、60個全てのシュリンクフィルムの位置ズレがないことも確認できた。これにより、本発明の筒状容器は、筒状容器本体とシュリンクフィルムとの適切な密着強度を有することが確認できた。
なお、シュリンク温度や準備加熱工程での温度は適宜調節可能である。また、準備加熱工程は、例えば、80℃等の一定の温度でもよい。また、適切にシュリンクフィルムをシュリンクできれば、密着工程での加熱のみで準備加熱工程は行わなくてもよい。
2・・・・ 筒状容器本体
10・・・ ロール
11・・・ 開口
12・・・ 稜線部
13・・・ 筒状シュリンクフィルム
13a・・・フィルム接合部14・・・ 巻き出されたシュリンクフィルム
15・・・ 小切れのシュリンクフィルム
16・・・ 胴部
17・・・ 蓋部
17a・・・ 吐出口
18・・・ 底部
20・・・ 胴部側面
21・・・ ホットメルト接着剤
25・・・ 筒状シュリンクフィルムを外嵌した容器本体
30・・・ カッター
31・・・ 第1樹脂層
32・・・ バリア層
34・・・ 紙層
35・・・ 第2樹脂層
40・・・ ヒーター
50・・・ ノズル
100・・・ 従来の筒状シュリンクフィルム
102・・・ 巻込み部
120・・・ 胴部側面
Claims (19)
- 筒状の胴部を有する筒状容器本体と、
前記胴部の外周面を密着して覆う筒状シュリンクフィルムと、を備え、
前記胴部の少なくとも端縁部の1箇所で、前記胴部と前記筒状シュリンクフィルムとがホットメルト接着剤で接着されている、筒状容器。 - 前記ホットメルト接着剤が外径5mm以上15mm以下、かつ塗布厚み2mm以下で塗布されている、請求項1に記載の筒状容器。
- 前記胴部は、その内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されている、請求項1または2に記載の筒状容器。
- 筒状容器本体の、筒状の胴部の外周面における少なくとも端縁部の1箇所にホットメルト接着剤を塗布する塗布工程と、
前記胴部の周方向において、前記ホットメルト接着剤が塗布されている位置と、平坦に潰されて稜線部が形成された筒状シュリンクフィルムの前記稜線部の位置とを合わせて、前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、
前記筒状容器本体および前記筒状シュリンクフィルムを加熱して、前記筒状シュリンクフィルムをシュリンクさせて前記胴部の外周面に密着させるとともに、前記ホットメルト接着剤により前記胴部と前記筒状シュリンクフィルムとを接着する接着工程と、を備える、筒状容器の製造方法。 - 長尺の筒状シュリンクフィルム連続体を切断して、前記胴部の中心軸線方向の長さと同等の長さを有する前記筒状シュリンクフィルムを形成する切断工程をさらに備える、請求項4に記載の筒状容器の製造方法。
- 前記ホットメルト接着剤を塗布する領域が外径5mm以上15mm以下であり、かつ前記ホットメルト接着剤の塗布厚みが2mm以下である、請求項4または5に記載の筒状容器の製造方法。
- 内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されている筒状の胴部を有する筒状容器本体と、
前記胴部の外周面を密着して覆う筒状シュリンクフィルムと、を備え、
前記筒状シュリンクフィルムのシュリンク温度が、前記第2樹脂層の軟化温度よりも高い、筒状容器。 - 前記シュリンク温度は170℃以上であり、前記軟化温度は80℃以下である、請求項7に記載の筒状容器。
- 内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されている筒状の胴部を有する筒状容器本体と、前記胴部の外周面を密着して覆う筒状シュリンクフィルムと、を備える筒状容器の製造方法であって、
前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、
前記筒状容器本体および前記筒状シュリンクフィルムを、前記第2樹脂層の軟化温度よりも高い第1温度で加熱して、前記筒状シュリンクフィルムをシュリンクさせて前記胴部の外周面に密着させる密着工程と、を備える、筒状容器の製造方法。 - 前記第1温度は170℃以上であり、前記軟化温度は80℃以下である、請求項9に記載の筒状容器の製造方法。
- 前記密着工程よりも前に、前記筒状シュリンクフィルムが外嵌された前記胴部の全体を、前記第1温度よりも低い第2温度で加熱する準備加熱工程をさらに備え、
前記第2温度は前記第2樹脂層の軟化温度以上である、請求項9または10に記載の筒状容器の製造方法。 - 前記第2温度は80℃以上である、請求項11に記載の筒状容器の製造方法。
- 長尺の筒状シュリンクフィルム連続体を切断して、前記胴部の中心軸線方向の長さと同等の長さを有する前記筒状シュリンクフィルムを形成する切断工程をさらに備える、請求項9から12のいずれか1項に記載の筒状容器の製造方法。
- 筒状の胴部、並びに前記胴部の両端部をそれぞれ密閉する蓋部および底部を有し、前記蓋部に内容物の吐出口が形成された筒状容器本体と、
前記胴部の外周面を密着して覆うとともに、フィルム接合部を有する筒状シュリンクフィルムと、を備え、
前記フィルム接合部は、前記胴部の外周面のうちの、前記吐出口と前記蓋部の外周縁との間隔が最も狭い箇所の逆側に配置されている、筒状容器。 - 前記フィルム接合部は、少なくとも1枚のフィルムの2箇所が溶着されて形成されている、請求項14に記載の筒状容器。
- 前記胴部は、その内周面側から順に、第1樹脂層、バリア層、紙層、および第2樹脂層が少なくとも積層されている、請求項14または15に記載の筒状容器。
- 筒状の胴部、並びに前記胴部の両端部をそれぞれ密閉する蓋部および底部を有し、前記蓋部に内容物の吐出口が形成された筒状容器本体と、前記胴部の外周面を密着して覆うとともに、フィルム接合部を有する筒状シュリンクフィルムと、を備える筒状容器の製造方法であって、
前記フィルム接合部が、前記胴部の外周面のうちの、前記吐出口と前記蓋部の外周縁との間隔が最も狭い箇所の逆側に配置されるように、前記胴部の周方向において前記胴部と前記筒状シュリンクフィルムとの位置を合わせて、前記筒状シュリンクフィルムを前記胴部に外嵌する外嵌工程と、
前記筒状容器本体および前記筒状シュリンクフィルムを加熱して、前記筒状シュリンクフィルムをシュリンクさせて前記胴部の外周面に密着させる密着工程と、を備える、筒状容器の製造方法。 - 少なくとも1枚のフィルムの2箇所を溶剤を用いて溶着して、前記フィルム接合部を形成するフィルム溶着工程をさらに備える、請求項17に記載の筒状容器。
- 長尺の筒状シュリンクフィルム連続体を切断して、前記胴部の中心軸線方向の長さと同等の長さを有する前記筒状シュリンクフィルムを形成する切断工程をさらに備える、請求項17または18に記載の筒状容器の製造方法。
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