container

Abstract

To provide a container that is small in environmental load and superior in designability, and can suppress inter-layer peeling inside a paper layer.SOLUTION: There is provided a container which has a trunk part for containing an object body. The trunk part is formed of a laminate 10 having a paper layer 12 forming an intermediate layer, an inside resin layer 11 laminated inside the paper layer 12, and an outside resin layer 13 laminated outside the paper layer 12. The paper layer 12 has a plurality of through holes 14 formed over the entire trunk part, the inside resin layer 11 and the outside resin layer 13 being bonded in the plurality of through holes 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a container. [Background technology]

[0002] Patent document 1 describes a self-supporting cylindrical container that includes a cylindrical member made of a cylindrical laminated film having a bonding layer on its outermost surface that is bonded to a sealant layer on its innermost surface, a top member provided on the top surface, and a bottom member provided on the bottom surface.

[0003] Patent Document 2 describes a paper container for liquids that uses at least paper as a base material, has sides with see-through films on the front and back of the base material, and has a window section on the side without a base material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-1715 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-98339 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, attempts have been made to reduce the amount of plastic used in containers and packaging and to increase the amount of biodegradable materials used, such as paper and cellophane. However, in fields where plastic containers have traditionally been used, when trying to replace them with paper or cellophane, it has been difficult to reproduce the luxurious design that can be achieved with plastic.

[0006] Furthermore, when paper is used as the base material of the container, there is a risk of delamination occurring in the paper layer. For example, when the paper layer is formed into a cylindrical shape, the end of the paper layer may be exposed in the longitudinal or circumferential direction of the tube, which may cause deterioration of the paper layer. Furthermore, even if it is not the end of the paper layer, when an external force such as squeezing is applied, the paper layer may be deteriorated due to delamination.

[0007] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a container that has a small environmental impact, is excellent in design, and is capable of suppressing delamination of the paper layers. [Means for solving the problem]

[0008] In order to solve the above problem, the present invention provides a container having a body for accommodating contents, wherein the body is formed from a laminate having a paper layer forming an intermediate layer, an inner resin layer laminated on the inside of the paper layer, and an outer resin layer laminated on the outside of the paper layer, wherein a plurality of through holes are formed in the paper layer throughout the body, and the inner resin layer and the outer resin layer are bonded together at the plurality of through holes.

[0009] The inner resin layer and the outer resin layer may each be formed from an adhesive resin layer or a sealant resin layer. The laminate may have a printing substrate layer having a printing layer on at least one side thereof, and an adhesive resin layer that adheres the printing substrate layer to the paper layer from the outside of the paper layer. The inner or outer surface of the body may have irregularities corresponding to the shape of the through-hole.

[0010] The laminate may have a first sealant resin layer that forms the inner surface of the body portion and a second sealant resin layer that forms the outer surface of the body portion, and the body portion may be formed into a cylindrical shape by joining the inner surface of the body portion and the outer surface of the body portion at both circumferential ends. The body portion may be cylindrical, and a molding member or an end member may be joined to at least one end of the body portion in the length direction. The molding member or the end member may have an opening for removing the contents. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a container that has a small environmental impact, is excellent in design, and is capable of suppressing delamination of the paper layers. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a cross-sectional view showing an example of a laminate. [Figure 2] FIG. 1 is a cross-sectional view showing an example of a laminate having a printing substrate layer. [Figure 3] 10(a) to 10(d) are plan views illustrating examples of through-hole patterns in a laminate. [Figure 4] FIG. 2 is a front view showing the container of the first embodiment. [Figure 5] FIG. 10 is a front view showing a container according to a second embodiment. [Figure 6] FIG. 10 is a front view showing a container according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be described below based on preferred embodiments with reference to the drawings. Figures 1 and 2 show examples of laminates 10 and 100 according to the embodiments. Figures 3(a) to 3(d) are plan views illustrating patterns of through holes 14 in the laminates 10 and 100.

[0014] As shown in Figures 1 and 2, the laminate 10, 100 of this embodiment has a paper layer 12, which serves as an intermediate layer, having a plurality of through holes 14 formed throughout the laminate 10, 100. The through holes 14 penetrate between the inner and outer surfaces of the paper layer 12. In addition to the paper layer 12, the laminate 10, 100 has at least an inner resin layer 11 laminated on the inner side of the paper layer 12 and an outer resin layer 13, 17 laminated on the outer side of the paper layer 12. The inner resin layer 11 and the outer resin layer 13, 17 close the through holes 14.

[0015] The inside is the side closer to the space in the body where the contents are stored, and the outside is the side farther from the space in the body where the contents are stored. The inside surface is called the inside surface, and the outside surface is called the outside surface, and the inside and outside surfaces together are sometimes called both surfaces.

[0016] The container of the embodiment has a body formed from the laminate 10,100. The through holes 14 are distributed throughout the body. Both surfaces in the thickness direction of the laminate 10,100 can form the inner and outer surfaces of the body, respectively. When forming the body from the laminate 10,100, another layer may be laminated on the inner surface of the laminate 10,100, and the inner surface of the body may be formed from that other layer. Alternatively, another layer may be laminated on the outer surface of the laminate 10,100, and the outer surface of the body may be formed from that other layer. These other layers include a coating layer, a cover film layer, etc.

[0017] The laminate 10, 100 has an adhesive portion 15 inside the through hole 14, where the inner resin layer 11 and the outer resin layer 13, 17 are bonded together. The adhesive portion 15 may be formed by welding the inner resin layer 11 and the outer resin layer 13, 17 together. If either the inner resin layer 11 or the outer resin layer 13, 17 is an adhesive resin layer, the adhesive portion 15 may be formed by the adhesive force of the adhesive resin layer. In this way, the inner resin layer 11 and the outer resin layer 13, 17 may be in direct contact with each other at the adhesive portion 15, or the adhesive portion 15 may be formed by an adhesive interposed between the inner resin layer 11 and the outer resin layer 13, 17. In the following description, the inner resin layer 11 and the outer resin layer 13, 17 may be collectively referred to as the resin layers 11, 13, 17.

[0018] The adhesive portion 15 made of the resin layers 11, 13, and 17 is formed inside the through-hole 14, thereby preventing delamination of the paper layer 12. For example, when the laminate 10, 100 is cut to the shape and dimensions of the trunk portion, the paper layer 12 is not continuous in the direction along the edge of the laminate 10, 100, and portions of the paper layer 12 and portions where the adhesive portion 15 is formed inside the through-hole 14 alternate. This improves the strength of the paper layer 12 at the edge of the laminate 10, 100.

[0019] The through holes 14 with the adhesive portions 15 formed therein do not necessarily have to be located on the ends of the laminate 10, 100, but may be located near the ends of the laminate 10, 100. Furthermore, the through holes 14 with the adhesive portions 15 formed therein are distributed throughout the laminate 10, 100, even in areas other than the ends of the laminate 10, 100. This prevents delamination of the paper layers 12 even when an external force such as ironing is applied to the laminate 10, 100, improving the strength of the container.

[0020] The laminate 10, 100 can be used as a raw roll for forming a body portion. The raw roll for the body portion may have an area large enough to form multiple body portions from one sheet. The through holes 14 and adhesive portions 15 may be formed in the region of the raw roll where the body portion will be formed. In regions where the body portion will not be formed, for example, regions that will become cutting waste when the raw roll is cut to form the body portion, the formation of the through holes 14 or adhesive portions 15 may be omitted.

[0021] The ratio (area ratio) of the area of ​​the through holes 14 to the total area of ​​the paper layer 12, including the through holes 14, in a plane intersecting the thickness direction of the paper layer 12 is, for example, approximately 1 to 99%, or approximately 10 to 90%. The larger the area ratio of the through holes 14, the larger the area ratio where the adhesive joints 15 are formed, thereby improving the reinforcing effect of the paper layer 12. The larger the area ratio of the paper layer 12 excluding the through holes 14, the more paper can be used and the less resin can be used. Specific examples of the area ratio of the through holes 14 include, but are not limited to, 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, or intermediate values ​​or values ​​close to these.

[0022] The pattern of the multiple through holes 14 in a plane intersecting the thickness direction of the paper layer 12 is not particularly limited and may be regular or irregular. Within a unit area containing a specific number of through holes 14, the through holes 14 may be arranged with less regularity, and the unit area may be regularly repeated in a predetermined direction of the body. When the laminate 10, 100 forms a long web, the pattern of through holes 14 may be repeated in the machine direction (MD), cross direction (TD), or diagonal direction. When the body is cylindrical, square, or other tubular, the pattern of through holes 14 may be repeated in the circumferential direction, length direction, or diagonal direction of the body.

[0023] The circumferential direction of the cylindrical body is the direction along the annular cross section of the body in a cross section that cuts through the cylindrical body. The longitudinal direction of the cylindrical body is the direction connecting both open ends of the cylindrical body. When the cylindrical body is placed upright, the longitudinal direction is the same as the height direction. The radial direction of the cylindrical body is the direction connecting any point on the annular cross section of the body to the center point in a plane that intersects with the longitudinal direction.

[0024] The plan views shown in Figures 3(a) to (d) are developed views in which the left-right direction of the paper corresponds to the circumferential direction of the body and the up-down direction of the paper corresponds to the longitudinal direction of the body. Figures 3(a) and (b) show an example in which the through holes 14 are quadrangular (approximately square), while Figures 3(c) and (d) show an example in which the through holes 14 are circular. Figures 3(a) and (c) show an example in which adjacent through holes 14 are repeatedly arranged diagonally. Figures 3(b) and (d) show an example in which adjacent through holes 14 are repeatedly arranged in the up-down and left-right directions.

[0025] The shape of the through holes 14 is not limited to a rectangle or a circle, and any shape can be used. The shape of the through holes 14 may be a polygon such as a triangle, pentagon, or hexagon, or a curved shape such as an ellipse or egg shape. Linear through holes 14 having a desired width may be arranged in an appropriate shape such as a wave shape, cloud shape, or mountain shape. Two or more types of through holes 14 with different shapes, dimensions, etc. may be mixed. Tools such as punching or press dies may be used to form the through holes 14 in the paper layer 12.

[0026] The diameter of the through hole 14 is, for example, within the range of 1 to 20 mm. When the shape of the through hole 14 is polygonal, the diameter refers to the distance between opposing vertices, sides, or vertices and sides, and when there are two or more of these, it is preferable that the minimum and maximum values ​​are within the above ranges. When the shape of the through hole 14 is non-circular, such as elliptical, the diameter refers to, for example, the maximum value of the distance between any two points on the periphery of the through hole 14. Specific examples of the diameter of the through hole 14 are not particularly limited, but include, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, etc., or intermediate values ​​or values ​​close to these.

[0027] The interval between adjacent through holes 14 is, for example, within a range of 1 to 20 mm. The interval between through holes 14 is, for example, the minimum distance between any one point on the outer periphery of a first through hole 14 and any one point on the outer periphery of a second through hole 14 between two adjacent through holes 14. Specific examples of the interval between through holes 14 are not particularly limited, and include, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, etc., or intermediate values ​​or values ​​close to these.

[0028] When the resin layers 11, 13, 17 laminated in the through holes 14 of the laminates 10, 100 are transparent, the contents can be seen from the outer surface of the laminates 10, 100. In the case of the laminates 100 having the printed substrate layer 16, the state of the contents can be visually confirmed from the outer surface of the laminate 100, depending on the transparency of the printed substrate layer 16. Even when the resin layers 11, 13, 17 are colored or hazy, the structure can be such that the amount, shape, etc. of the contents can be confirmed from the outer surface of the laminates 10, 100 as a shadow through the inside of the through holes 14. The term "transparent" does not necessarily mean colorless transparent, but may also mean colored transparent.

[0029] When the laminate 10, 100 is transparent through the through-hole 14, the color, shape, etc. of the contents can be displayed at the position of the through-hole 14, and a design that changes over time can be realized by combining it with the color, etc. of the laminate 10, 100 around the through-hole 14. For example, the contents may be a liquid containing particles with a particle size approximately the same as or smaller than the diameter of the through-hole 14. Specific examples include beverages, seasonings, medicines, etc., in which granular materials are dispersed.

[0030] The paper layer 12 is formed from a paper sheet. Examples of fibers that make up paper include plant fibers, animal fibers, mineral fibers, synthetic fibers, and recycled fibers. From the perspective of reducing the petroleum dependency of the laminates 10 and 100, paper manufactured by agglutinating plant fibers such as wood pulp, bamboo pulp, straw pulp, bast fibers, seed hair fibers, leaf vein fibers, and grass fibers is preferred. Since resin layers 11, 13, and 17 are laminated on both sides of the laminates 10 and 100, there is no need to provide a resin layer on the paper that forms the paper layer 12. From the perspective of making the laminates 10 and 100 thin and facilitating the processing of the body, the basis weight of the paper layer 12 is set to 7 to 60 g / m 2 It is preferable to set it to about this level.

[0031] The color of the paper layer 12 is not particularly limited and may be white or a color such as brown or yellow. When coloring the paper layer 12, a coloring agent such as a dye may be added to the pulp during papermaking, or a coloring agent such as a dye may be adsorbed onto the paper layer 12 after papermaking. The paper layer 12 may have two or more colors in each region, such as a gradation or pattern, or the coloring may form a pattern. Some or all of the regions of the paper forming the paper layer 12 may be colored by dyeing, metal vapor deposition, or the like. The color of the paper layer 12 may be visible from the outer surface of the laminate 10, 100 through the outer resin layer 13, 17. In this case, the colored paper layer 12 will be visible from the outer surface of the laminate 10, 100.

[0032] In the laminate 10 shown in Fig. 1, the inner resin layer 11 is formed from a first sealant resin layer 11 on both sides of the paper layer 12, and the outer resin layer 13 is formed from a second sealant resin layer 13. The first sealant resin layer 11 forms the inner surface of the body, and the second sealant resin layer 13 forms the outer surface of the body. For the laminate 10, the inner resin layer 11 and the first sealant resin layer 11 are designated by the same reference numeral, and the outer resin layer 13 and the second sealant resin layer 13 are designated by the same reference numeral.

[0033] In the laminate 100 shown in FIG. 2 , a printing substrate layer 16 and an adhesive resin layer 17 are laminated between a paper layer 12 and a second sealant resin layer 13. On both sides of the paper layer 12, an inner resin layer 11 is formed from a first sealant resin layer 11, and an outer resin layer 17 is formed from an adhesive resin layer 17. The adhesive resin layer 17 is used for interlayer adhesion between at least the paper layer 12 and the printing substrate layer 16. Furthermore, the adhesive resin layer 17 may be adhesive to the first sealant resin layer 11. In the laminate 100, the inner resin layer 11 and the first sealant resin layer 11 are designated by the same reference numeral, and the outer resin layer 17 and the adhesive resin layer 17 are designated by the same reference numeral.

[0034] By bonding the inner resin layer 11 and the outer resin layers 13, 17 inside the through hole 14, the surfaces of the laminates 10, 100, which form the inner and outer surfaces of the body, are formed with irregularities corresponding to the shape of the through hole 14. The surface of the first sealant resin layer 11 is formed with recesses 11a recessed according to the depth to which the inner surface of the inner resin layer 11 has fallen into the through hole 14, and protrusions 11b consisting of the surface remaining around the recesses 11a. The surface of the second sealant resin layer 13 is formed with recesses 13a recessed according to the depth to which the inner surfaces of the outer resin layers 13, 17 have fallen into the through hole 14, and protrusions 13b consisting of the surface remaining around the recesses 13a.

[0035] The inner resin layer 11 laminated on the inner surface of the paper layer 12 does not necessarily have to be the first sealant resin layer 11 that forms the inner surface of the body. Another layer (not shown) may be interposed between the first sealant resin layer 11 and the paper layer 12, and an adhesive resin layer may be laminated to bond the other layer to the inner surface of the paper layer 12. In this case, the adhesive resin layer becomes the inner resin layer 11. The other layer is not particularly limited, but examples include a resin layer, a paper layer, a metal layer, and a cellophane layer.

[0036] 1 and 2 show that the inner resin layer 11 and the outer resin layers 13, 17 are respectively recessed into the through-hole 14 from both sides of the paper layer 12. As a result, recesses 11a, 13a and protrusions 11b, 13b are formed on the surfaces of the first sealant resin layer 11 and the second sealant resin layer 13. In the following description, the first sealant resin layer 11 or the second sealant resin layer 13 may be collectively referred to as the sealant resin layer 11, 13.

[0037] Although not specifically shown, only the inner resin layer 11 may be recessed into the through hole 14, so that the recesses 11a and protrusions 11b are formed only on the surface of the first sealant resin layer 11, which forms the inner surface of the barrel. Alternatively, only the outer resin layers 13, 17 may be recessed into the through hole 14, so that the recesses 13a and protrusions 13b are formed only on the surface of the second sealant resin layer 13, which forms the outer surface of the barrel.

[0038] By forming recesses 11a, 13a on the surfaces of the sealant resin layers 11, 13, it is possible to adjust or improve the tactile sensation of the fingers gripping the contents or the container. The recesses 13a and protrusions 13b formed on the second sealant resin layer 13, which forms the outer surface of the body, provide anti-slip properties and also contribute to a beautiful appearance. The recesses 11a, 13a of the sealant resin layers 11, 13 tend to create shadows at the position of the through-hole 14. If the resin layers 11, 13, 17 of the through-hole 14 are transparent, the shadows created by the recesses 11a, 13a, the colors of the resin layers 11, 13, 17, and the contents of the body visible through the through-hole 14 overlap, allowing for a variety of designs to be realized.

[0039] When both the inner resin layer 11 and the outer resin layers 13, 17 each fall into the inside of the through hole 14 and block the cross section of the through hole 14, the thickness of each resin layer 11, 13, 17 can be made thinner, and the thickness of the laminate 10, 100 can also be made thinner, compared to when only one of the inner resin layer 11 or the outer resin layers 13, 17 falls into the inside of the through hole 14 and blocks the cross section of the through hole 14.

[0040] When bonding the inner resin layer 11 and the outer resin layers 13, 17 inside the through-hole 14, the direction or depth to which the resin layers 11, 13, 17 fall into the through-hole 14 can be adjusted by adjusting the direction, strength, etc. of applying pressure to the laminate 10, 100 from the inside or outside. If the resin layers 11, 13, 17 are heated and melted when pressure is applied to the resin layers 11, 13, 17, the fluidity of the resin layers 11, 13, 17 increases, making it easier to close the through-hole 14. To prevent air bubbles from remaining, vibrations may be applied using ultrasound or the like.

[0041] The resin layers 11, 13, and 17 in contact with the paper layer 12 preferably have appropriate fluidity when heat-welded or formed to the paper layer 12. For example, the melt (mass) flow rate (MFR) at the heat-welding or forming temperature is preferably about 5 to 20 g / 10 min. Before laminating the resin layers 11, 13, and 17 on the paper layer 12, the surface of the paper layer 12 may be subjected to a surface treatment such as anchor treatment to improve adhesion to the resin layers 11, 13, and 17.

[0042] The inner resin layer 11 may be laminated first toward the inner surface of the paper layer 12 having the through hole 14, and then the outer resin layers 13, 17 may be laminated on the outer surface of the paper layer 12. Alternatively, the outer resin layers 13, 17 may be laminated first toward the outer surface of the paper layer 12 having the through hole 14, and then the inner resin layer 11 may be laminated on the inner surface of the paper layer 12. When laminating the resin layers 11, 13, 17 on one side of the paper layer 12 having the through hole 14, a receiving surface such as rubber or film may be provided on the surface of the paper layer 12 opposite the resin layers 11, 13, 17.

[0043] Examples of sealant resins that form the sealant resin layers 11 and 13 include at least one of polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET) and polylactic acid (PLA), cyclic olefin resins such as cycloolefin polymer (COP) and cycloolefin copolymer (COC), thermoplastic resins, adhesive resins, and coating agents. The sealant resin layers 11 and 13 can be made of any resin that has adhesive properties to the same type of sealant resin layer 11 or 13. The thickness of each of the first sealant resin layer 11 and the second sealant resin layer 13 is, for example, 10 to 50 μm, and may be approximately 25 to 30 μm.

[0044] Because the sealant resin layers 11, 13 are laminated on both sides of the laminate 10, 100, when forming a cylindrical body from the laminate 10, 100, it is preferable to face and join the inner surface of the laminate 10, 100 at one circumferential end of the body to the outer surface of the laminate 10, 100 at the other circumferential end of the body. When forming the laminate 10, 100 into a cylindrical shape by joining the inner surface and the outer surface of the body at both circumferential ends of the body, the joint does not protrude in the radial direction of the body, as would occur if the inner surfaces or outer surfaces of the laminate 10, 100 were joined together. This allows for improved design and feel at the joint.

[0045] When the body portion is formed from the laminate 10, 100 by heat sealing using the sealant resin layer 11, 13, there are no problems with adhesive overflow or insufficient application, compared to joining the laminate 10, 100 by partial application of adhesive, and the laminate 10, 100 can be joined more reliably. The sealant resin in at least one of the sealant resin layers 11, 13 may melt to cover the edge of the paper layer 12 or the printed substrate layer 16. Furthermore, a coating agent such as resin or varnish may be applied to cover the edge of the paper layer 12 or the printed substrate layer 16 at the circumferential edge of the laminate 10, 100.

[0046] In the cylindrical body, at or near the joint where the circumferential ends of the laminates 10, 100 are joined, as described above, the resin layers 11, 13, 17 laminated on both sides of the paper layer 12 are joined inside the through hole 14. This makes it possible to prevent delamination of the paper layer 12 at the end of the paper layer 12 that contacts the joint.

[0047] Examples of adhesive resins that form the adhesive resin layer 17 include at least one of polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET) and polylactic acid (PLA), cyclic olefin resins such as cycloolefin polymer (COP) and cycloolefin copolymer (COC), thermoplastic resins, and coating agents. It is preferable to use an adhesive resin that is appropriate for the materials and surface conditions of the paper layer 12 and the printing substrate layer 16. The thickness of the adhesive resin layer 17 is, for example, 10 to 50 μm, and may be approximately 25 to 30 μm.

[0048] The thickness of each of the resin layers 11, 13, and 17 in contact with the paper layer 12 is preferably at least 5 μm, and more preferably at least 10 μm, thicker than half the thickness of the paper layer 12 having the through-hole 14. This allows the resin layers 11, 13, and 17 to be more uniformly bonded to the surface of the paper layer 12 surrounding the through-hole 14, even if part of the resin layers 11, 13, and 17 falls into the through-hole 14.

[0049] It is preferable that at least one of the sealant resin layers 11, 13 or the adhesive resin layer 17 contains a biomass resin. The sealant resin or adhesive resin may be a mixture of a biomass resin and another resin. The sealant resin or adhesive resin may be formed solely from a biomass resin. Examples of biomass resins that can be used as sealant resins or adhesive resins include biomass polyethylene, biomass polypropylene, biomass polyethylene terephthalate, and biomass polylactic acid.

[0050] Synthetic resins derived from fossil fuels such as petroleum contain radioactive carbon (14 Biomass resins derived from biomass such as plants contain carbon. 14 The ratio of carbon derived from biomass (biomass ratio) is: 14 It can be measured based on the content of C. The biomass degree of the biomass resin is preferably 50% or more, more preferably 80% or more, and most preferably 100%.

[0051] Since the second sealant resin layer 13 is laminated on the paper layer 12 or the printed substrate layer 16, it is preferably a highly transparent sealant resin so that at least one of the paper layer 12 or the printed substrate layer 16 can be seen from the outer surface of the laminate 10, 100. Examples of highly transparent sealant resins that are preferred include low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), which have lower crystallinity than high-density polyethylene (HDPE), due to their excellent heat-sealing properties and transparency. By laminating the second sealant resin layer 13 on the paper layer 12 or the printed substrate layer 16, it is possible to protect the design of the printed layer or the like formed on the paper layer 12 or the printed substrate layer 16, provide waterproofing and stain resistance, and suppress color fading.

[0052] The printing substrate layer 16 is formed from a printing substrate and a printing layer laminated on at least one side of the printing substrate. Examples of printing substrates include paper, cellophane, resin film, and metal foil. When the printing substrate is transparent, such as cellophane or resin film, the printing layer may be formed on the inner surface of the printing substrate. When printing layers are laminated on both sides of the printing substrate, the designs of these printing layers can be overlapped and made visible from the outside of the laminate 10, 100.

[0053] When the printed layer is formed on the entire surface of the laminate 10, 100, the paper layer 12 can be made invisible from the outer surface of the laminate 10, 100. By omitting a portion of the printed layer, the paper layer 12 laminated inside the printed layer can be made visible from the outer surface of the laminate 10, 100. The printed layer can be formed from an ink layer containing a coloring material such as a pigment or dye, and a binder such as a resin or oil.

[0054] A solid print layer may be formed on the entire surface of the printing substrate, and then a pattern print layer may be overlaid on top of it. The pattern print may be a pattern print including multiple colors. The number of colors in the multi-color print is not particularly limited, but examples include 2 colors, 3 colors, 4 colors, 5 colors, 6 colors, 7 colors, 8 colors, etc. The pattern print may be laminated on the entire surface of the solid print. The pattern print may be laminated only on a partial area of ​​the solid print. Two or more layers of pattern print may be laminated.

[0055] The thickness of the laminate 10, 100 is preferably 500 μm or less as the total thickness of each layer, and may be approximately 350 μm or 200 μm. The proportion of the thickness of the laminate 10, 100 that is accounted for by the paper layer 12 may be, for example, 5 to 95%, 10 to 90%, or 20 to 80%. The proportion of the thickness of the laminate 10, 100 that is accounted for by the printing substrate layer 16 may be, for example, 5 to 95%, 10 to 90%, or 20 to 80%. The proportion of the thickness of the laminate 10, 100 that is accounted for by the total thickness of the sealant resin layers 11, 13 or adhesive resin layer 17 may be, for example, 5 to 95%, 10 to 90%, or 20 to 80%. In the laminates 10, 100, the balance of the materials, thicknesses, etc. of the paper layer 12, the print substrate layer 16, the sealant resin layers 11, 13, and the adhesive resin layer 17 can be designed as appropriate.

[0056] The laminates 10, 100 may have layers other than the layers described above. For example, a transparent resin film may be laminated between the paper layer 12 and the second sealant resin layer 13 as a base layer, reinforcing layer, etc. The transparency of the transparent resin film is not limited to colorless transparency, and may also be colored transparency. A desired resin film may be laminated between the paper layer 12 and the first sealant resin layer 11 as a base layer, reinforcing layer, etc.

[0057] The material of the resin film that can be laminated as an intermediate layer of the laminate 10, 100 as a resin layer other than the sealant resin layers 11, 13 is not particularly limited, but examples include polyamide resins such as nylon, polyester resins such as polyethylene terephthalate, polyethylene resins, oriented polypropylene resins, and polyolefin resins such as cyclic olefin resins. The thickness of the resin film used as the intermediate layer is, for example, 5 to 50 μm, and more preferably 7 to 30 μm.

[0058] The laminate 10, 100 may be a packaging material without a barrier layer. Alternatively, the laminate 10, 100 may be a packaging material with a barrier layer. The barrier layer is a layer that reduces the permeability of water vapor or oxygen. Examples of the barrier layer of the laminate 10, 100 include a metal foil such as aluminum foil, a resin film vapor-deposited with a metal such as aluminum, or a metal oxide such as silica or alumina. Even when the laminate 10, 100 does not have a barrier layer, the sealant resin layers 11, 13 are laminated on both sides of the laminate 10, 100, thereby reducing the permeability of water vapor, oxygen, etc. compared to the paper layer 12. It is preferable that the sealant resin layers 11, 13 have lower permeability than the paper layer 12.

[0059] By covering the inner surface of the paper layer 12 with the first sealant resin layer 11 and the outer surface of the paper layer 12 with the second sealant resin layer 13 or the adhesive resin layer 17, it is possible to suppress the water absorption of the laminate 10,100. Even when paper, cellophane, or the like is used as the printing substrate of the printing substrate layer 16, it is possible to suppress the water absorption of the laminate 10,100 by covering the inner surface of the printing substrate layer 16 with the first sealant resin layer 11 or the adhesive resin layer 17 and covering the outer surface of the printing substrate layer 16 with the second sealant resin layer 13. This improves the water resistance of the laminate 10,100 and also suppresses wrinkles and poor appearance of the laminate 10,100 caused by moisture absorption by the paper layer 12 or the printing substrate layer 16.

[0060] The method for laminating the layers forming the laminate 10,100 is not particularly limited, but examples include dry lamination, extrusion lamination, and coextrusion. An adhesive layer made of an adhesive, adhesive resin, anchoring agent, or the like may be provided between the layers. The laminate 10,100 may be endowed with one or more functions, such as oxygen absorption, odor absorption, or non-adsorption. Therefore, the laminate 10,100 may have a functional layer having one or more functions, such as oxygen absorption, odor absorption, or non-adsorption.

[0061] The functional layer having an oxygen absorbing function (oxygen absorbing layer) may be formed from a resin layer containing an oxygen absorbent such as a conjugated diene polymer or a transition metal compound. A functional layer (such as an odor absorbing layer or deodorizing layer) having an odor absorbing function may be formed, for example, from a resin layer or paper layer containing an odor absorbing agent. Examples of odor absorbing agents include deodorizers that decompose or absorb odorous components such as ammonia, amines, hydrogen sulfide, mercaptans, chlorine compounds, and aldehydes, as well as fragrances and air fresheners that alleviate the sense of odorous components. An appropriate agent may be used as the odor decomposing agent for each target odorous component. Porous materials such as activated carbon, wood and bamboo charcoal, and zeolite may also be used as odor adsorbents. The functional layer (non-adsorption layer) having a non-adsorption function may be, for example, a resin layer containing a non-adsorption resin such as a polyester resin or a cyclic olefin resin laminated as a sealant layer that comes into contact with the contents or an inner layer close to the contents.

[0062] The container of the embodiment has a body portion in which the storage space for the contents is surrounded by the above-described laminate 10, 100. The contents stored in the body portion are not particularly limited and may be any of liquids, solids, powders, granules, and mixtures of two or more of these. The contents stored in the body portion are surrounded by the above-described laminate 10, 100. The types of contents are not particularly limited and may include beverages, food products, seasonings, cosmetics, pharmaceuticals, detergents, adhesives, household goods, industrial products, etc.

[0063] The cylindrical body has end faces that open at both ends in the length direction. The shape of these end faces is not limited to circular, but may be elliptical, oval, oval, polygonal, etc. Examples of polygonal end face shapes include triangular, rectangular, pentagonal, hexagonal, heptagonal, octagonal, nonagonal, and decagonal. The shapes of both end faces of the body are not limited to being congruent (same shape and same dimensions), and the body may have a taper, for example, so that one end face is larger or smaller than the other end face. For example, the shapes of both end faces of the body may be different from each other, such as one end face being circular and the other end face being polygonal.

[0064] The diameter of the body is not particularly limited, but is, for example, within the range of 5 to 250 mm, preferably within the range of 10 to 200 mm. When the body is a rectangular tube, the diameter is the distance between opposing vertices, sides, or vertices and sides, and when there are two or more of these, it is preferable that the minimum and maximum values ​​are within the above ranges. The diameter of the body is not particularly limited, but may be, for example, 20 mm, 50 mm, 100 mm, 150 mm, etc.

[0065] A shaped member or an end member may be joined to at least one end in the length direction of the cylindrical body. The shaped member or end member may close the end face of the body. The shaped member or end member may be provided with an opening for removing the contents. The shaped member may be a three-dimensional molded product. The end member may be a thin member with a two-dimensional flat or curved surface, such as a sheet-like film or laminate.

[0066] The shaped member or end surface member can be disposed on the upper surface (top surface) or lower surface (bottom surface) when the length direction of the body is arranged vertically. Even when the length direction of the body is not vertically, the shaped member or end surface member can be disposed on at least one of the end surfaces of the body.

[0067] The molded member can be formed from metal, resin, wood, etc. The molded member is preferably formed from a molding resin such as a thermoplastic resin, a thermosetting resin, or a photocurable resin. The molding resin may contain additives such as a filler or a stabilizer. Examples of molding resins include polyolefin resins such as polyethylene and polypropylene; polyester resins such as polyethylene terephthalate and polylactic acid; and other thermoplastic resins.

[0068] At the joint between the laminate 10, 100 forming the body and the molding member, a resin selected from the sealant resin layers 11, 13 or the molding resin may be melted to coat the end of the paper layer 12 or the printed substrate layer 16 with resin. Also, at the end of the laminate 10, 100 in the longitudinal direction, a coating agent such as resin or varnish may be applied to coat the end of the paper layer 12 or the printed substrate layer 16.

[0069] The end surface members may be formed from the same laminate 10, 100 as the body portion, or may be formed from other sheet-like materials. Examples of other sheet-like materials that can form the end surface members include resin films, paper substrates, and laminate films in which different materials such as paper or metal foil are laminated to a resin. When the laminate film has a sealant resin layer on at least one side, the sealant resin layer of the end surface members can be bonded to the sealant resin layers 11, 13 of the body portion. The paper substrate of the other sheet-like members may be a paper layer without through holes 14.

[0070] When joining an end member to the longitudinal end of the body, at least one of the sealant resin layers 11, 13 of the laminate 10, 100 forming the body can be opposed to at least one surface of the end member in the thickness direction. The peripheral portion of the end member may be bent in the longitudinal direction of the body along the inner or outer surface of the body.

[0071] The molded member or the end surface member may be a non-flexible plate. The molded member or the end surface member may be a bottom plate at the bottom of the body. The bottom plate is formed of, for example, a hard resin. Examples of materials that can be used to form the bottom plate include polyolefin resins such as polyethylene (PE) and polypropylene (PP), and polyester resins such as polyethylene terephthalate (PET). The bottom plate can be produced by, for example, injection molding.

[0072] The bottom plate and the body can be joined by heat sealing (thermal welding). There are no particular limitations on the method of joining by thermal welding, but examples include ultrasonic welding, high-frequency welding, and laser welding. The bottom plate and the body may also be joined by an adhesive.

[0073] As described above, at or near the joint where the body part and the molding member or the end member are joined, the resin layers 11, 13, and 17 laminated on both sides of the paper layer 12 having the through hole 14 are joined inside the through hole 14. This makes it possible to suppress delamination of the paper layer 12 at the end of the paper layer 12 that contacts the joint.

[0074] <Cylindrical container> 4 shows a cylindrical container 20 as a container of the first embodiment. The cylindrical container 20 comprises a body 21 formed from the laminate 10, 100 described above, a shoulder 22 joined to the upper end of the body 21, a cap 24 that closes a spout 23 of the shoulder 22, and a bottom 25 joined to the lower end of the body 21. The shoulder 22 may be formed from the molded member described above. The bottom 25 may be formed from the end surface member described above or from the molded member described above.

[0075] The spout 23 may be formed integrally with the shoulder 22. If the top surface is formed from a flat end member instead of the shoulder 22, the spout 23 may be molded and joined to the end member, and pouring may be possible through an opening formed in the end member. The cap 24 may be connected to the spout 23 by screws, adhesives, thin-walled sections, fitting, elastic contraction force, etc. The connection between the spout 23 and the cap 24 may allow repeated attachment and detachment (resealing). The spout 23 may be designed so that it cannot be resealed once the cap 24 has been opened. The spout 23 may be reclosable using an opened cap 24, but the state in which the cap 24 has been opened may be visually confirmed.

[0076] The means for closing the spout 23 is not limited to the cap 24, and any other structure may be used. For example, a sealing film may be attached to the spout 23, and the contents may be sucked out by inserting a straw into the film. Although not shown, the spout 23 and the cap 24 may be connected via a thin portion such as a hinge. In this case, the shoulder portion 22, the spout 23, and the cap 24 may be formed as a single molded member.

[0077] When the end surface member of the bottom 25 of the cylindrical container 20 is omitted, it is also possible to form a tube container by closing the body in the radial direction. A sealing portion for sealing the bottom 25 of the tube container can be formed by welding the first sealant resin layers 11 on the inner surface of the laminate 10, 100 to each other. A coating agent such as resin or varnish may be applied to the end of the laminate 10, 100 at the sealing portion to cover the end of the paper layer 12.

[0078] In a cylindrical container 20 having a body 21 formed into a cylindrical shape such as a cylinder, if the body 21 were formed only from a flexible resin film, the weight of the contents would cause the body 21 to deform when filled with contents, resulting in a poor appearance. In the case of the cylindrical container 20 of the embodiment, the body 21 is formed from a laminate 10, 100 including a paper layer 12 having a through-hole 14 and resin layers 11, 13, 17 covering both sides of the paper layer 12. This provides appropriate durability and deformability, making it possible to prevent deformation of the body 21, for example, swelling of the lower part of the body 21 due to the weight of the contents.

[0079] <Jar container> Fig. 5 shows a jar 30 as a container of the second embodiment. The jar 30 comprises a body 31 formed from the laminates 10 and 100 described above, an annular member 32 joined to the upper end of the body 31, a lid 33 that seals an opening formed in the annular member 32 in an openable and closable manner, and a bottom 34 joined to the lower end of the body 31. The annular member 32 may be formed from the molded member described above. The bottom 34 may be formed from the end surface member described above.

[0080] If sealing of the contents is not required, the lid portion 33 may be provided with holes or with a mesh or lattice. The lid portion 33 may be formed from a molded member that is integrated with the annular member 32 via a hinge or the like. The lid portion 33 may be molded separately from the annular member 32 so that the lid portion 33 can be connected to the annular member 32 by screws, fitting, or the like. A ring-shaped edge having a diameter smaller than the inner diameter of the lid portion 33 may protrude from the upper surface of the annular member 32, and the edge of the annular member 32 and the outer periphery of the lid portion 33 may overlap in the radial direction.

[0081] The portion of the annular member 32 that is joined to the body 31 may be the first annular member, and the portion that is joined to the lid 33 may be the second annular member, and the first and second annular members may be formed as separate bodies. In this case, the step of joining the first annular member to the body 31 and the step of connecting the second annular member to the first annular member may be performed in stages. The structure for joining the lid 33 to the second annular member may be the same as the structure for joining the lid 33 to the annular member 32 described above.

[0082] Examples of structures for connecting the first and second annular members include thermal welding of resins forming the annular members, bonding using an adhesive, insert molding in which one annular member is molded integrally with the other annular member, screws, and fitting.A ring-shaped edge portion having a diameter smaller than the inner diameter of the second annular member may be protruded from the upper surface of the first annular member, and the edge portion of the first annular member and the second annular member may be overlapped in the radial direction.A ring-shaped edge portion having a diameter smaller than the inner diameter of the first annular member may be protruded from the lower surface of the second annular member, and the edge portion of the second annular member and the first annular member may be overlapped in the radial direction.

[0083] <Rod-shaped container> 6 shows a rod-shaped container 40 as a container of the third embodiment. The rod-shaped container 40 includes a body 41 formed from the above-described laminates 10, 100, and lid members 42, 43 that seal both longitudinal ends of the body 41. The lid members 42, 43 can each be formed from the above-described molded member.

[0084] The stick-shaped container 40 is suitable for storing stick-shaped items such as syringes, lipsticks, and sweets. The syringe may be a pharmaceutical container pre-filled with an injection solution. A holding member of an appropriate structure can be stored in the stick-shaped container 40 to hold the stick-shaped item inside the stick-shaped container 40. The holding member may be fixed to the stick-shaped container 40 and the stick-shaped item may be held by the holding member. The holding member holding the stick-shaped item may also be stored inside the stick-shaped container 40 without being fixed to the stick-shaped container 40.

[0085] The lid members 42, 43 may be polygonal to prevent the rod-shaped container 40 from rolling when placed on its side. The polygon has approximately 3 to 10 corners or sides, such as a triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, or decagon. The body 41 may have a polygonal prism shape having approximately 3 to 10 side faces on the outer surface of the body 41, such as a triangular prism, square prism, pentagonal prism, hexagonal prism, heptagonal prism, octagonal prism, nonagonal prism, or decagonal prism. The lid members 42, 43 may have protrusions on their outer peripheries to prevent rolling.

[0086] At least one of the lid members 42, 43 may have an installation surface. This allows the rod-shaped container 40 to be placed upright with the installation surface facing downward. For example, the installation surface may be set on a plane that is approximately perpendicular to the central axis of the cylindrical body 41. The outer periphery of the installation surface may be flat, with a recess formed on the inside of the outer periphery. Three or more protrusions may be formed on the installation surface, and the rod-shaped container 40 may be placed upright with the tips of the protrusions facing downward.

[0087] When opening the rod-shaped container 40, an outlet may be provided in at least one of the lid members 42, 43. For example, the lid members 42, 43 may be ring-shaped, with the inside of the ring serving as the outlet. To close the outlet, a closure such as a cap or plug may be attached to the lid members 42, 43. The outlet may also be formed as an opening in the body 41. When the opening in the body 41 or the lid members 42, 43 serves as the outlet, the outlet may be closed by adhering a covering material such as a film, sheet, or paper around the periphery of the outlet.

[0088] When opening the rod-shaped container 40, the body 41 may be broken to form a dispensing opening. To make the body 41 breakable, a break line such as a dotted line or a continuous line may be formed in at least one layer of the laminate 10, 100 that forms the body 41. The break line may be formed, for example, by laser processing, mechanical processing, or the like. Because the paper layer 12 has excellent tearability, an opening initiation portion such as a notch-shaped cut or a tongue-shaped tab may be formed at the end of the body 41. When tearing begins from the opening initiation portion, a tear in the body 41 can be easily formed in the desired range along that extension line.

[0089] The present invention has been described above based on preferred embodiments, but the present invention is not limited to the above-described embodiments and examples, and various modifications are possible within the scope of the present invention. Modifications include addition, substitution, omission, and other changes to components in the embodiments or examples. Furthermore, components used in two or more examples can be combined as appropriate.

[0090] The container of the present invention is not limited to the above-described embodiments and examples, and can be applied to various packaging containers, etc. The body portion is not limited to being formed from one laminate 10, 100, and may be formed from two or more laminates 10, 100. [Explanation of symbols]

[0091] 10,100...Laminate, 11...First sealant resin layer (inner resin layer), 11a...Concave portion of first sealant resin layer, 11b...Convex portion of first sealant resin layer, 12...Paper layer, 13...Second sealant resin layer (outer resin layer), 13a...Concave portion of first sealant resin layer, 13b...Convex portion of first sealant resin layer, 14...Through hole, 15...Adhesive portion, 16...Printing substrate layer, 17...Adhesive resin layer (outer resin layer), 20...Cylindrical container, 21,31,41...Body portion, 22...Shoulder portion, 23...Pouring spout, 24...Cap, 25,34...Bottom portion, 30...Jar container, 32...Annular member, 33...Lid portion, 40...Rod-shaped container, 42,43...Lid member.

Claims

1. A container having a body for accommodating contents, the body portion is formed from a laminate having a paper layer forming an intermediate layer, an inner resin layer laminated on the inner side of the paper layer, and an outer resin layer laminated on the outer side of the paper layer, a plurality of through holes are formed in the paper layer throughout the body portion, and the inner resin layer and the outer resin layer are bonded to each other through the plurality of through holes; A container characterized in that the body portion is cylindrical, the pattern of the through holes is repeated in the circumferential direction, longitudinal direction, or diagonal direction of the body portion, and adjacent through holes are repeated in a diagonal direction.

2. 2. The container according to claim 1, wherein the inner resin layer and the outer resin layer are each formed from an adhesive resin layer or a sealant resin layer.

3. 3. The container according to claim 1, wherein the inner or outer surface of the body has irregularities corresponding to the shape of the through-hole.

4. The container according to any one of claims 1 to 3, characterized in that the body portion is cylindrical and a molded member or an end member is joined to at least one end of the body portion in the longitudinal direction.

5. 5. The container according to claim 4, wherein the molding member or the end member has an opening for removing the contents.

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