Mouth with protective cover

Abstract

To provide a protective-cover-attached mouth part in which a tab region for opening is easily recognized, and which can reduce the number of members discarded after opening.SOLUTION: A protective-cover-attached mouth part 10 includes: a mouth part 100; and a protective cover 200 provided at an upper part of a barrel-shaped container. The mouth part 100 has a trunk part 110 and a flange part 120. A trunk part covering part 230 of the protective cover 200 includes: an adhesive region 232 having a plurality of adhesive parts 232a, and a tab region 234 formed below the adhesive region 232. Each adhesive part 232a is formed with rear side adhesive layers of the protective cover 200 being adhered to each other. The tab region 234 has no adhesive part 232a, or has a number of adhesive parts smaller than the number of the adhesive parts in the adhesive region. A space inside the mouth part communicates with a space outside the mouth part, via a space between a portion adjacent to the adhesive part 232a in the circumferential direction out of the adhesive region 232 and an outer peripheral surface of the trunk part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mouth part with a protective cover. [Background technology]

[0002] Conventionally, a structure in which the mouth of a barrel-shaped container such as a beer keg is covered with a protective cover is known. For example, JP 2007-168829 A discloses a cap seal with a top plate, which includes a flat top plate that covers the opening of the mouth of the barrel-shaped container, and a heat-shrinkable cylindrical film that is heat-sealed to the upper surface of the top plate and extends downward from the periphery of the top plate. The cylindrical film has a ring-shaped folded upper portion that contacts the upper surface of the periphery of the top plate, and an opening tab is provided on a part of the folded upper portion to protrude inward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-168829 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a cap seal with a top plate as described in JP 2007-168829 A, it may be difficult to identify the gripping area for opening, and after opening, two members, the top plate and the tubular film, are generated as waste.

[0005] An object of the present invention is to provide a mouth portion with a protective cover that allows easy identification of a gripping area for opening and reduces the number of parts that are discarded after opening. [Means for solving the problem]

[0006] A mouth with a protective cover according to one aspect of the present invention comprises a mouth provided at an upper portion of a barrel-shaped container, and a protective cover that protects the mouth, the protective cover having a base layer and a back side adhesive layer provided on the back side of the base layer, the mouth having a body portion formed in a cylindrical shape, and a flange portion that protrudes outward in a radial direction of the body portion from an upper end portion of the body portion and has a shape that is connected in an annular manner in the circumferential direction of the body portion, the protective cover having an upper surface covering portion that covers an upper surface of the flange portion, and a body covering portion that covers an outer circumferential surface of the body portion, the body covering portion having a plurality of flange portions arranged at intervals in the circumferential direction. the flange portion having a number of adhesive parts and an adhesive region having an outer diameter smaller than the outer diameter of the flange portion, and a gripping region formed below the adhesive region, each adhesive part in the plurality of adhesive parts is formed by bonding the back adhesive layers together, and the gripping region does not have the adhesive part or has a smaller number of adhesive parts than the number of adhesive parts in the adhesive region, and the space inside the mouth portion is connected to the space outside the mouth portion between the upper surface covering portion and the flange portion, and between a portion of the adhesive region adjacent to the adhesive part in the circumferential direction and the outer peripheral surface of the body portion. Effect of the Invention

[0007] According to the present invention, it is possible to provide an opening portion with a protective cover that makes it easy to identify the gripping area for opening and reduces the number of parts that are discarded after opening. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a schematic diagram of a barrel-shaped container including a mouth with a protective cover in one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a front view of the mouth portion with a protective cover. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. [Figure 6] FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] 1A to 1C are cross-sectional views illustrating a manufacturing process of a mouth portion with a protective cover. [Figure 8] 1A to 1C are cross-sectional views illustrating a manufacturing process of a mouth portion with a protective cover. [Figure 9] 1A to 1C are cross-sectional views illustrating a manufacturing process of a mouth portion with a protective cover. [Figure 10] 1A to 1C are cross-sectional views illustrating a manufacturing process of a mouth portion with a protective cover. [Figure 11] 1A to 1C are cross-sectional views illustrating a manufacturing process of a mouth portion with a protective cover. [Figure 12] 13 is a cross-sectional view showing a schematic modification of the protective cover and the adhesive portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, in which the same or corresponding components are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view showing a barrel-shaped container including a mouth with a protective cover according to one embodiment of the present invention. Fig. 2 is a perspective view of the mouth with a protective cover. Fig. 3 is a front view of the mouth with a protective cover.

[0011] As shown in Fig. 1, the barrel-shaped container 1 includes a container body 5 and a mouth portion 10 with a protective cover. The container body 5 can contain beverages and other contents. The container body 5 is particularly preferably used for containing beer. The container body 5 has a top plate portion 5a.

[0012] The mouth portion 10 with a protective cover comprises a mouth portion 100 and a protective cover 200.

[0013] The mouth part 100 is provided on the top plate part 5a of the container body 5. The mouth part 100 is made of metal or the like. As shown in FIGS. 2 to 4, the mouth part 100 has a body part 110, a flange part 120, and a connection part .

[0014] The body 110 is formed in a cylindrical shape. A valve structure or the like to which a jig capable of filling the container body 5 with contents or discharging the contents from the container body 5 can be connected is provided inside the body 110. As shown in Fig. 4, the outer diameter of the body 110 is constant over the entire area in a direction parallel to the central axis AX of the body 110. However, the outer diameter of the body 110 may increase or decrease as it moves downward in a direction parallel to the central axis AX, and a small protrusion or the like may be provided on the outer circumferential surface of the body 110.

[0015] Flange portion 120 protrudes outward from the upper end of body portion 110 in the radial direction of body portion 110 (left and right direction in FIG. 4 ) and has a shape that is connected in an annular shape in the circumferential direction of body portion 110. The dimension of flange portion 120 in the up-down direction is smaller than the dimension of body portion 110 in the same direction. Flange portion 120 has upper surface portion 121, tapered portion 122, and corner portion 123.

[0016] The upper surface portion 121 constitutes the upper surface of the flange portion 120. The upper surface portion 121 is formed flat. The upper surface portion 121 is perpendicular to the central axis AX.

[0017] Tapered portion 122 has a shape that gradually expands in diameter from the upper end portion of body portion 110 toward the upper side. Tapered portion 122 is inclined with respect to the outer circumferential surface of body portion 110. The angle between tapered portion 122 and central axis AX is preferably 30 degrees or more and 60 degrees or less, and more preferably 40 degrees or more and 45 degrees or less.

[0018] Corner portion 123 connects the outer end of upper surface portion 121 and the outer end of tapered portion 122. Corner portion 123 has a shape that is curved so as to be convex outward in the radial direction.

[0019] The connection part 130 is connected to the lower part of the body part 110. The connection part 130 is a portion that is connected to the top plate part 5a of the container body 5.

[0020] The protective cover 200 protects the mouth part 100. The protective cover 200 is formed in a thin film or sheet shape. As shown in FIG. 5, the protective cover 200 is preferably formed in a rectangular shape before being attached to the mouth part 100. The protective cover 200 may be formed, for example, 90 mm square. However, the outer shape of the protective cover 200 may be formed in a polygonal shape, a circle, or an ellipse different from a rectangular shape, or may be formed in a shape having a protruding part on the periphery like a petal. When the outer shape of the protective cover 200 is rectangular, it is preferable that the outer shape of the protective cover 200 is formed in a rectangular shape because it can be formed only by cutting a raw roll of a predetermined width to a predetermined length without using a special cutting die or the like. As shown in FIG. 4, the protective cover 200 has a base layer 201 and a back adhesive layer 202.

[0021] The base layer 201 is made of paper, cellophane, synthetic resin, etc. The mouth portion 100 is preferably breathable (particularly water vapor permeable) because water droplets are likely to adhere to the inside during filling or cleaning. In addition, the base layer 201 is preferably made of paper or cellophane that can be manufactured from plant-derived pulp materials, etc., because it can reduce the environmental impact of reducing plastic waste and reducing greenhouse gas emissions such as carbon dioxide. The surface of the base layer 201 may be provided with a printed layer (not shown) on which a character design is applied by gravure printing, flexographic printing, offset printing, screen printing, ink jet printing, etc., and a transparent overcoat layer (not shown) that covers the printed layer. When the base layer 201 is made of paper, the thickness is preferably set to 30 μm to 150 μm, and when the base layer 201 is made of cellophane, the thickness is preferably set to 20 μm to 60 μm. In this way, the strength of the base layer 201 and ease of folding (ease of molding) are ensured.

[0022] The base material layer 201 is preferably one that can easily maintain the folded state, and is preferably one that can easily develop a fold when the back adhesive layer 202 is laminated on the base material layer 201. As a structure that can easily develop a fold, it is preferable that the measured angle near the fold in the following folding evaluation test is 60 degrees or less.

[0023] (1) A 10 cm square test piece is lightly folded in four, and the first fold is pressed with a room temperature pressure bar for one second (pressure 0.65 kgf / cm 2 ) multiplied. (2) Fold the specimen in four and spread it out on one side. When spreading it out, lift up the edge of the specimen (the part away from the fold) and spread it out. (3) Leave it for 30 seconds and then measure the opening angle of the first crease.

[0024] This measurement was carried out on the following three test pieces. First test piece: Paper (Nagoya Bashi Ryuo, manufactured by Daio Paper Co., Ltd.) 50g / m 2 A sheet laminated with a water-based heat sealant made of olefin resin. Second test piece: Cellophane (Futamura Chemical's MST AZ-1 #300, moisture-proof cellophane coated on both sides with acrylic heat sealant) The third test piece: A sheet of PET film (Toyobo biaxially oriented PETE5101, 12 μm) coated with a heat seal agent of ethylene vinyl acetate copolymer and laminated.

[0025] The measurement angle of the first test piece was 40 degrees. The measurement angle of the second test piece was 50 degrees. The measurement angle of the third test piece was 80 degrees. In other words, the first test piece and the second test piece were configured to be prone to creases.

[0026] The base layer 201 made of cellophane has the following characteristics: it has transparency similar to that of a synthetic resin film, and has excellent low electrostatic properties, heat resistance, tearability, anti-fogging properties, moisture permeability, and solvent resistance.

[0027] In the base material layer 201 having good tearability, by pinching and pulling up the gripping region 234 described below, the protective cover 200 can be easily removed from the mouth portion 100 because the base material layer 201 can be easily torn from the circumferential edge of the adhesive portion 232a. Such tearability can be evaluated by the following method.

[0028] (1) Prepare a test piece measuring 80 mm x 30 mm. (2) One end of the test piece, which is 80 mm long, is clamped horizontally with a metal plate across its entire width (30 mm), and the other end is held by a clamp connected to a testing machine (push-pull gauge) capable of measuring tensile load. The test piece clamped with the metal plate is pulled up at an angle of 45 degrees upward and 45 degrees toward the front. (3) Measure the load when the test piece begins to tear.

[0029] The tear load measured in this manner is preferably less than 20 N. The measured value of the first test piece was 1 N to 15 N. The measured value of the second test piece was 1 N to 15 N. The measured values ​​of the PET film and OPP film of the third test piece were 20 N or more. In other words, the first test piece and the second test piece had a configuration with good tearability.

[0030] The back adhesive layer 202 is provided on the back surface of the base material layer 201. An undercoat layer (not shown) for improving the adhesion of the back adhesive layer 202 to the base material layer 201 may be provided between the base material layer 201 and the back adhesive layer 202. The back adhesive layer 202 is not adhered to the mouth portion 100. Therefore, the protective cover 200 is rotatable relative to the mouth portion 100.

[0031] The backside adhesive layer 202 is preferably made of a material having thermal adhesiveness. Examples of such materials include thermoplastic resins such as polyethylene, polypropylene, polyamide, acrylic, and polyester. The backside adhesive layer 202 is more preferably made of a material that allows the backside adhesive layers 202 to be thermally bonded together at low temperatures, particularly at about 70°C to 100°C, such as low-density polyethylene, acrylic acid copolymer resins such as ethylene-vinyl acetate copolymer and ethylene-acrylic acid copolymer, chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer, ionomer, etc.

[0032] The back adhesive layer 202 may be formed by laminating it onto the back surface of the base layer 201 by melt extrusion coating, but is preferably applied in the form of a dispersion of emulsion or dispersion (for example, aqueous polyolefin dispersion "product name: Chemipearl" by Mitsui Chemicals, Inc., aqueous emulsion of copolymerized nylon or ethylene vinyl acetate copolymer, etc., "product name: Sepolsion" by Sumitomo Seika Chemicals, Inc.) or contains a water-soluble resin such as polyvinyl alcohol. In this way, the paper fibers are easily dissociated during recycling, improving the recyclability of the base layer 201.

[0033] The backside adhesive layer 202 is not limited to a thermally adhesive one, but may be made of a water-soluble resin such as polyvinyl alcohol or starch, which is activated by water or humidification to bond, or it may be a rubber-based adhesive layer called a cold seal agent, which bonds the adhesive layers when they are brought together.

[0034] The thickness of the backside adhesive layer 202 is preferably thinner than that of the base layer 201, and is preferably 1 μm to 20 μm, more preferably 2 μm to 15 μm, and even more preferably 3 μm to 10 μm.

[0035] As shown in FIGS. 2 to 4, the protective cover 200 has an upper surface covering portion 210, a lower surface covering portion 220, and a body covering portion 230. The upper surface covering portion 210 is a top surface covering portion.

[0036] The upper surface covering portion 210 covers the upper surface portion 121 of the flange portion 120. A portion of the back side adhesive layer 202 located on the back surface of the upper surface covering portion 210 is not adhered to the upper surface portion 121. It is preferable that the printing layer and the overcoat layer are provided on the upper surface covering portion 210.

[0037] The lower surface covering portion 220 covers the tapered portion 122. An upper end portion of the lower surface covering portion 220 is connected to an edge portion of the upper surface covering portion 210. A portion of the back side adhesive layer 202 located on the back surface of the lower surface covering portion 220 is not adhered to the tapered portion 122.

[0038] The trunk covering part 230 covers the outer peripheral surface of the trunk 110. The trunk covering part 230 is connected to the lower end part of the lower covering part 220. In other words, the lower covering part 220 is formed between the upper covering part 210 and the trunk covering part 230. The trunk covering part 230 has an adhesive region 232 and a gripping region 234.

[0039] The adhesive region 232 has an outer diameter smaller than the outer diameter of the flange portion 120. Therefore, the protective cover 200 is prevented from being separated upward from the mouth portion 100. As shown in FIG. 3, the adhesive region 232 has a plurality of adhesive portions 232a arranged at intervals in the circumferential direction. As shown in FIG. 6, each adhesive portion 232a is formed by bonding the back adhesive layers 202 to each other. More specifically, each adhesive portion 232a is formed by forming a portion where the back adhesive layers 202 contact each other by folding (creasing) the base material layer 201, and bonding the portions to each other. Each adhesive portion 232a is formed by heating the protective cover 200 in a state where the protective cover 200 is squeezed so that the protective cover 200 fits along the outer circumferential surface of the body portion 110 (a state where a folded portion is formed in the base material layer 201 and a portion where the back adhesive layers 202 contact each other is formed). 4, the adhesive region 232 is formed in a circumferential band shape with a width of 1 mm to 10 mm in the vertical direction between a boundary P1 between the flange portion 120 and the body portion 110 and a position P2 10 mm below the boundary P1. A portion of the back adhesive layer 202 located on the back side of the adhesive region 232 is not adhered to the body portion 110.

[0040] The pinching region 234 is formed below the adhesive region 232. The pinching region 234 does not have adhesive parts 232a or has adhesive parts fewer than the number of adhesive parts 232a in the adhesive region 232. The part of the back adhesive layer 202 formed on the back side of the pinching region 234 is not adhered to the body 110. In this embodiment, the pinching region 234 is formed at each corner of the protective cover 200. However, when the length of the adhesive region 232 in the vertical direction is relatively small (for example, about 1 mm to 3 mm), in addition to each corner of the protective cover 200, the part between each corner of the periphery of the protective cover 200 (the part constituting the side of the protective cover 200) also constitutes the pinching region 234. The printed layer and the overcoat layer may be provided on the base layer 201 at this corner. In this case, it is preferable that the printed layer includes an indication indicating that the corner is a part to be pinched. In this way, it becomes easier to identify the portion of pick-up area 234 that is to be picked.

[0041] The space S1 (see FIG. 4) inside the mouth portion 100 communicates with the space S2 (see FIG. 4) outside the mouth portion 100 through the gap between the upper surface covering portion 210 and the upper surface portion 121, between the lower surface covering portion 220 and the tapered portion 122, and between the adjacent portion 232b (see FIG. 6) of the adhesive region 232 adjacent to the adhesive portion 232a in the circumferential direction and the outer circumferential surface of the body portion 110. In addition, the base layer 201 and the back adhesive layer 202 have good breathability. Therefore, water vapor generated in the space S1 is effectively released to the space S2.

[0042] Next, a method for manufacturing the mouth part 10 with a protective cover (a method for attaching the protective cover 200 to the mouth part 100) will be described with reference to Figures 7 to 11. The method for manufacturing the mouth part 10 with a protective cover includes a preparation step, a pressing step, a folding step, a retraction step, and an adhesive part forming step.

[0043] In the preparation step, the mouth portion 100 including the body portion 110 and the flange portion 120, and the protective cover 200 including the base material layer 201 and the back adhesive layer 202 are prepared, and the protective cover 200 is positioned above the mouth portion 100 as shown in Fig. 7. At this time, the protective cover 200 is placed above the mouth portion 100 with the back adhesive layer 202 facing the mouth portion 100.

[0044] In the pressing step, as shown by an arrow AR8 in Fig. 8, the protective cover 200 is pressed against the upper surface portion 121 of the mouth portion 100 by the pressing tool 20. The pressing tool 20 is formed in a cylindrical shape having an outer diameter substantially equal to that of the upper surface portion 121. However, as long as the protective cover 200 can be pressed against the upper surface portion 121 of the mouth portion 100, the pressing tool 20 is not limited to a cylindrical shape and may be formed in a cylindrical shape or the like. In order to facilitate the folding step that is the next step after the pressing step, the pressing tool 20 may be heated in the pressing step.

[0045] In the folding process, while the pressing tool 20 keeps pressing the protective cover 200, the portion of the protective cover 200 that protrudes from the upper surface portion 121 is folded downward by the ring member 30 as shown by the arrow AR9 in FIG. 9. The ring member 30 has an inner diameter larger than the outer diameter of the flange portion 120. The inner diameter of the ring member 30 is set so that the distance between the inner peripheral surface of the ring member 30 and the outer end of the flange portion 120 is about twice the thickness of the protective cover 200 or slightly larger than that. In the folding process, the ring member 30 may be heated to facilitate folding of the protective cover 200 and to make it difficult for the protective cover 200 to return from the folded state. When the portion of the protective cover 200 that protrudes from the upper surface portion 121 is folded downward by the heated ring member 30, the base material layer 201 may be folded and the back adhesive layers 202 may be bonded to each other. In this case, the adhesion between the back side adhesive layers 202 is in a provisional or pseudo-adhesive state such that the folded state of the protective cover 200 does not easily unfold.

[0046] In the folding process, the member used to fold downward the portion of protective cover 200 that protrudes from upper surface portion 121 is not limited to ring member 30. In the folding process, a cylindrical member, a plurality of pressing members arranged at intervals in the circumferential direction, or the like may be used.

[0047] In the retraction step, while the pressing of the protective cover 200 by the pressing tool 20 is maintained, the ring member 30 is retracted upward until it is separated from the protective cover 200, as shown by the arrow AR10 in Fig. 10. Note that, in order to reliably maintain the protective cover 200 in a state in which it is bent by the ring member 30, the ring member 30 may be positioned at a position where it is not buffered by the clamping member 40 used in the next adhesive portion forming step, that is, at a position where the lower end of the ring member 30 overlaps with the flange portion 120 in the radial direction, without retracting the ring member 30 upward until it is separated from the protective cover 200.

[0048] In the adhesive formation step, as indicated by an arrow AR11 in Fig. 11, a portion 231 (see Fig. 10) of the protective cover 200 overlapping with the upper portion of the body portion 110 in the radial direction is pressed against the outer circumferential surface of the body portion 110 while being squeezed by a pair of clamping members 40. As shown in Figs. 7 to 10, each clamping member 40 has an arc portion 42 that fits along the outer circumferential surface of the body portion 110. In the adhesive formation step, the portion 231 of the protective cover 200 is pressed against the outer circumferential surface of the body portion 110 while being squeezed by the heated arc portion 42 so that the back-side adhesive layer 202 reaches a temperature at which it becomes adhesive. As a result, as shown in Fig. 11, the portion 231 of the protective cover 200 has a plurality of adhesive portions 232a, i.e., a portion where a number of overlapping portions are generated when the base material layer 201 is pressed against the outer peripheral surface of the body portion 110 while being squeezed by the clamping member 40, and the back adhesive layers 202 are adhered and fixed to each other in this state. As a result, the portion 231 of the protective cover 200 becomes an adhesive region 232. At this time, the back adhesive layers 202 are thermally adhered to each other, but since the surface of the body portion 110 made of a thick metal or the like is difficult to heat, the adhesion of the back adhesive layer 202 to the body portion 110 is difficult to occur, and when the body portion 110 is made of metal, the adhesion of the back adhesive layer 202 to the body portion 110 can be avoided by adjusting the temperature of the back adhesive layer 202 and the clamping member 40.

[0049] In the adhesive portion forming step, the pair of clamping members 40 do not press a portion 233 (see FIG. 10) located below the portion 231 of the protective cover 200 against the outer peripheral surface of the body portion 110. As a result, the portion 233 becomes the pinched region 234. In other words, in the adhesive portion forming step, only a portion of the protective cover 200 located above the lower end is pressed against the outer peripheral surface of the body portion 110 while being heated and squeezed by the pair of clamping members 40 so that the lower end of the protective cover 200 becomes the pinched region 234. Note that, although the adhesive portion 232a (a portion in a provisionally bonded or pseudo-bonded state) formed in the folding step may be present in the pinched region 234, the number of adhesive portions 232a in the pinched region 234 is smaller than the number of adhesive portions 232a in the adhesive region 232.

[0050] The members used to squeeze the portion 231 in the adhesive portion forming step are not limited to the pair of clamping members 40. In the adhesive portion forming step, a member having arc portions divided into four in the circumferential direction, the four arc portions pressing the portion 231 against the outer circumferential surface of the body portion 110 from all four sides, or a member having a large number of pressing portions arranged at intervals in the circumferential direction, the pressing portions pressing the portion 231 against the outer circumferential surface of the body portion 110, or the like may be used.

[0051] As described above, in the mouth part 10 with protective cover of this embodiment, the gripping area 234 is formed below the adhesive area 232 of the protective cover 200, which does not have adhesive parts 232a or has fewer adhesive parts 232a (parts in a temporary adhesive state or a pseudo-adhesive state) than the number of adhesive parts 232a in the adhesive area 232, so that it is easy to recognize the gripping area 234 and to pinch the gripping area 234 to open it, and since the protective cover 200 is made of a single member, only one member is discarded after opening. In addition, since the above-mentioned material with good tearability is used as the base material layer 201, it is preferable that the gripping area 234 is easily torn near the adhesive parts 232a when pinched to open it.

[0052] In the above embodiment, as shown in FIG. 12, the protective cover 200 may further have a front adhesive layer 203 provided on the surface of the base material layer 201. In this case, the front adhesive layers 203 are also bonded to each other in the adhesive portions 232a. Therefore, the adhesive portions 232a are prevented from peeling off unintentionally. As an example of such a protective cover 200, there is cellophane (having a base material layer 201 made of cellophane, a back adhesive layer 202 made of an acrylic resin, a vinyl chloride vinyl acetate resin, a polyvinylidene chloride resin, or the like, and a front adhesive layer 203 made of an acrylic resin, a vinyl chloride vinyl acetate resin, a polyvinylidene chloride resin, or the like) having thermal adhesive properties on both the front and back sides. In this protective cover 200, moisture resistance is also improved.

[0053] The protective cover 200 may also be made of so-called heat seal paper (paper containing low-melting resin fibers). In this case, the paper constitutes the base layer 201, and the low-melting resin fibers constitute the back adhesive layer 202.

[0054] Furthermore, the back adhesive layers 202 may be adjacent to each other over the entire circumferential area in the adhesive region 232. Furthermore, an adhesive portion 232a may be formed in at least one location of the lower surface covering portion 220.

[0055] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0056] The mouth with protective cover in the above embodiment comprises a mouth provided at the top of a barrel-shaped container and a protective cover that protects the mouth, the protective cover having a base layer and a back side adhesive layer provided on the back side of the base layer, the mouth having a body formed in a cylindrical shape and a flange portion that protrudes outward in the radial direction of the body from the upper end of the body and has a shape that is connected in an annular manner in the circumferential direction of the body, the protective cover having an upper surface covering portion that covers an upper surface of the flange portion and a body covering portion that covers an outer peripheral surface of the body, the body covering portion having a plurality of flanges arranged at intervals in the circumferential direction. The mouth portion has an adhesive region having an outer diameter smaller than the outer diameter of the flange portion, and a gripping region formed below the adhesive region, each of the adhesive regions in the plurality of adhesive regions is formed by bonding the back side adhesive layers together, and the gripping region does not have the adhesive region or has a smaller number of adhesive regions than the number of adhesive regions in the adhesive region, and the space inside the mouth portion is connected to the space outside the mouth portion between the upper surface covering portion and the flange portion, and between a portion of the adhesive region adjacent to the adhesive region in the circumferential direction and the outer peripheral surface of the body portion.

[0057] In this mouth with protective cover, a gripping area is formed below the adhesive area of ​​the protective cover that has no adhesive areas or has fewer adhesive areas than the adhesive area, so that it is easy to identify the gripping area and to pinch the gripping area to open it, and since the protective cover is made of a single member, only one member is discarded after opening. Furthermore, since the space inside the mouth communicates with the space outside the mouth, water vapor generated in the space inside the mouth can effectively escape to the outside space.

[0058] The protective cover may further include a front adhesive layer provided on the surface of the base material layer. In this case, it is preferable that the front adhesive layers are also bonded to each other in the adhesive portions.

[0059] In this embodiment, since both the front adhesive layer and the back adhesive layer are bonded at the adhesive joint, the adhesive joint is fixed in a folded-over state in the circumferential direction, preventing the adhesive joint from peeling off unintentionally.

[0060] Furthermore, since the adhesive region is formed between the boundary between the flange portion and the body portion and a position 10 mm below the boundary, the protective cover is held below the flange portion and is less likely to shift upward, which is preferable.

[0061] The flange portion may have a flat upper surface portion and a tapered portion having a shape that gradually increases in diameter from the upper end of the body portion toward the upper side. In this case, it is preferable that the protective cover further has a lower surface covering portion that is formed between the upper surface covering portion and the body covering portion and covers the tapered portion.

[0062] In this embodiment, the tapered portion can cover the upper covering portion, the lower covering portion, and the body covering portion along the outer surface of the mouth. Also, since the flange portion includes a tapered portion and the protective cover has a lower covering portion, when the gripping region is gripped and the protective cover is pulled up to open it, the protective cover is prevented from getting caught on the flange portion, and the protective cover can be opened and removed smoothly, compared to a case where there is no tapered portion and the flange portion rapidly expands in diameter from the upper end portion of the body.

[0063] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0064] 1 barrel-shaped container, 5 container body, 5a top plate portion, 10 mouth portion with protective cover, 100 mouth portion, 110 body portion, 120 flange portion, 121 upper surface portion, 122 tapered portion, 123 corner portion, 130 connection portion, 200 protective cover, 201 base material layer, 202 back side adhesive layer, 203 front side adhesive layer, 210 upper surface covering portion, 220 lower surface covering portion, 230 body covering portion, 232 adhesive region, 232a adhesive portion, 232b adjacent portion, 234 gripping region, AX central axis.

Claims

1. A mouth portion provided at an upper portion of the barrel-shaped container; A protective cover for protecting the mouth portion, The protective cover is A base layer; A backside adhesive layer provided on the back side of the base layer, The mouth portion is A cylindrical body portion; a flange portion that protrudes outward in a radial direction of the body from an upper end portion of the body and has a shape that is annularly connected in a circumferential direction of the body, The protective cover is An upper surface covering portion that covers an upper surface of the flange portion; A trunk covering portion that covers an outer peripheral surface of the trunk portion, The trunk covering portion is a bonding region having a plurality of bonding portions spaced apart in the circumferential direction and having an outer diameter smaller than an outer diameter of the flange portion; a gripping area formed below the adhesive area, Each of the adhesive portions in the plurality of adhesive portions is formed by bonding the back adhesive layers to each other, the gripping region has no adhesive portions or has fewer adhesive portions than the number of adhesive portions in the adhesive region; A mouth portion with a protective cover, wherein the space inside the mouth portion is connected to the space outside the mouth portion via a gap between the upper surface covering portion and the flange portion, and between a portion of the adhesive region adjacent to the adhesive portion in the circumferential direction and the outer peripheral surface of the body portion.

2. The protective cover further has a front adhesive layer provided on a surface of the base material layer, The mouth section with protective cover according to claim 1 , wherein the front adhesive layers are also bonded to each other in each of the adhesive sections.

3. 3. The spout with protective cover according to claim 1, wherein the adhesive region is formed between a boundary between the flange portion and the body portion and a position 10 mm below the boundary.

4. The flange portion is A flat upper surface portion; A tapered portion having a shape that gradually increases in diameter from the upper end of the body portion toward the upper side, The mouth portion with a protective cover according to any one of claims 1 to 3, wherein the protective cover is formed between the upper surface covering portion and the body covering portion, and further has a lower surface covering portion that covers the tapered portion.

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