JP2013043684A - Paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container which can prevent a skive-hemming-finished part from being bent even if resin layers using different materials are provided on both surfaces of a base material.SOLUTION: The paper container includes: a body member 10 formed into a cylindrical shape by welding the processed part 61 and the second resin layer 53 of the other end side and pressure bonding the first resin layer 52 adjacent to the processed part 61 and the second resin layer 53 of the other end side, wherein a laminated material 50 includes a base 51 formed of a paper material and a first resin layer 52 and a second resin layer 53 formed of different resin materials on both main surfaces of the base, wherein the second resin layer 53 of the laminated material 50 is arranged in the inside thereof, and a processed part 61 having, on both main surfaces, the first resin layer 52 and a second resin layer 53 formed on one end side of the laminated material 50 by skive-hemming-finishing for removing part of the base 51 and bending it, is positioned in the inside thereof and laminated on the other end side of the laminated material 50; and a bottom member 11 for closing one end opening of the body member 10.

Description

  The present invention relates to a paper container having a resin layer on its surface.

  In a cup-type paper container using paper as a base material, a technique using a laminated material in which a resin layer made of a polyethylene resin, which is a thermoplastic resin, is provided on both surfaces of the base material in order to protect the base material is known. . Such a cup-shaped paper container includes a cylindrical body member and a bottom member fixed to a lower portion of the body member.

  Such a paper container is provided at one end of the fan-shaped laminated material in order to prevent the liquid as the contents from entering the base material from the cut surface (end face) of the laminated material located inside the paper container. A technique called so-called skive hemming is known in which a part of one main surface is removed to make it thin, and the resin layer is arranged on the end surface by folding back and fixing to the removed main surface side (for example, (See Patent Document 1 and Patent Document 2).

  In this paper container, the laminated material is rolled into a cylindrical shape so that one end side subjected to skive hemming is on the inner surface side of the paper container, and both end side parts are laminated, and the thermoplastic resin layers on the both end side parts are laminated. By making it weld, it can prevent that a base material exposes to an inner end surface.

JP 2004-18099 A JP 2004-18100 A

  The paper container described above has the following problems. That is, in the above-mentioned paper container, the thermoplastic resin layer has a unique odor called a so-called polyethylene odor when polyethylene resin is used for both the outer surface side and the inner surface side of the paper container. The fragrance to things is not good. In addition, the polyethylene resin also has a problem of adsorbing specific components of the contents.

  Therefore, it is conceivable to provide a resin layer other than polyethylene resin, for example, a polyethylene terephthalate resin layer, which is one of polyester resins, on the inner surface side of the paper container as the thermoplastic resin layer. However, different types of resins such as polyethylene resin and polyethylene terephthalate resin cannot be welded together.

  When a polyethylene resin layer is provided on the outer surface layer of the paper container, and a polyethylene terephthalate resin layer is provided on the inner surface layer, the skive hemming part is provided with a polyethylene terephthalate resin layer on both sides. The polyethylene terephthalate resin layers can be thermally welded together.

  However, since the polyethylene resin layer and the polyethylene terephthalate resin layer face each other, both end portions of the body member that overlaps beyond the skive hemming portion cannot be welded.

  Further, since the skive hemming portion is folded and fixed, there is a problem that the strength of the boundary portion between the end portion from which the main surface of the laminated material is removed and the folded end portion is low. For this reason, the paper container has a problem that the body member bends with the boundary portion of the skive hemming as a base point, and the opening shape becomes elliptical.

  Therefore, an object of the present invention is to provide a paper container that can prevent bending in the processed portion of the skive hemming process even if resin layers of different materials are provided on both surfaces of the substrate.

  In order to solve the above problems and achieve the object, the paper container of the present invention is configured as follows.

  As one aspect of the present invention, a base material formed of a paper material and the second resin layer of a laminated material having a first resin layer and a second resin layer formed of different resin materials on both main surfaces of the base material Are disposed on the inside of the first resin layer and the second resin layer formed on one side of the laminated material by a skive hemming process in which a part of the first resin layer and the base material is removed and bent. The processed portion is located on the inner side and laminated with the other end side portion of the laminated material, and welds the second resin layer on the processed portion and the other end side portion, and is adjacent to the processed portion. A body member formed in a cylindrical shape by press-bonding the first resin layer and the second resin layers on the other end side portion, and a bottom member that closes an opening at one end of the body member.

  As one aspect of the present invention, a base material formed of a paper material and the second resin layer of a laminated material having a first resin layer and a second resin layer formed of different resin materials on both main surfaces of the base material Is disposed on the inner side, and the first resin layer and a part of the base material are removed by leaving the first resin layer at one end of the laminated material at the end of the one end side. And a processed portion having the second resin layer on both main surfaces formed by skive hemming for welding the remaining first resin layer and the first resin layer of the laminated material. A body member formed in a cylindrical shape by being positioned and laminated with the other end side portion of the laminated material, and welding the second resin layers of the processed portion and the other end side portion; And a bottom member that closes an opening at one end.

  ADVANTAGE OF THE INVENTION According to this invention, even if it provides the resin layer of a different material on both surfaces of a base material, it becomes possible to provide the paper container which can prevent a bending in the boundary part of a skive hemming process part.

Explanatory drawing which shows the structure of the paper container which concerns on the 1st Embodiment of this invention in a partial cross section. Sectional drawing which shows typically the principal part structure of the trunk | drum member used for the paper container. Sectional drawing which shows typically the principal part structure of the trunk | drum member and bottom member which are used for the paper container. Sectional drawing which shows the principal part structure of the trunk | drum member typically. Sectional drawing which shows the principal part structure of the trunk | drum member typically. Sectional drawing which shows the shaping | molding method of the principal part of the trunk | drum member typically. Sectional drawing which shows the shaping | molding method of the principal part of the trunk | drum member typically. Sectional drawing which shows the shaping | molding method of the principal part of the trunk | drum member typically. Explanatory drawing which shows the manufacturing method of the paper container typically. Sectional drawing which shows typically the principal part structure of the trunk | drum member used for the paper container which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows the shaping | molding method of the principal part of the trunk | drum member typically.

(First embodiment)
Hereinafter, the configuration of the paper container 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 9.

  FIG. 1 is an explanatory diagram showing a partial cross section of the configuration of the paper container 1 according to the first embodiment of the present invention, and FIG. 2 is a main configuration of a barrel member 10 used in the paper container 1, specifically, the barrel. FIG. 3 is a cross-sectional view schematically showing the laminated material 50 of the member 10 enlarged in a main part II in FIG. 1, FIG. 3 is a main part configuration of the trunk member 10 and the bottom member 11 used in the paper container 1, specifically 1 is a cross-sectional view schematically showing the configuration of the trunk member 10 and the bottom member 11 by enlarging the main part III in FIG. 1, FIG. 4 shows the main part configuration of the trunk member 10, specifically, the configuration of the laminated portion 22. 1 is a cross-sectional view taken along the line IV-IV in FIG. 1 along the longitudinal direction of the laminated portion 22, and FIG. 5 shows the configuration of the laminated portion 22 of the body member 10 along the width direction of the laminated portion 22. FIG. 6 is a cross-sectional view schematically showing a method of forming the processed portion 61, which is a main part of the barrel member 10, and FIG. 7 is a processed portion 6 of the barrel member 10. FIG. 8 is a cross-sectional view schematically showing a method for forming the processed portion 61 of the body member 10, and FIG. 9 is an explanatory view schematically showing the method for manufacturing the paper container 1. .

  As shown in FIG. 1, the paper container 1 is formed of a laminated material 50 and is formed into a bottomed cylindrical shape, more specifically, a cup shape of a truncated cone shape that is bottomed and gradually expands toward an opening end. Has been. The paper container 1 is a so-called paper cup that can hold a liquid material as its contents. The paper container 1 is not limited to a paper cup, and may be a container having another shape or application as long as it has a bottomed cylindrical shape.

  As shown in FIG. 2, the laminated material 50 is formed on a base material 51 formed of a paper material, a first resin layer 52 formed on one surface of the base material 51, and the other surface of the base material 51. The second resin layer 53 is provided.

  The first resin layer 52 forms a surface on the outer surface side of the paper container 1. The first resin layer 52 is made of, for example, polyethylene resin. The second resin layer 53 forms a surface on the inner surface side of the paper container 1. The second resin layer 53 is formed of a polyester resin, for example, a polyethylene terephthalate resin. The second resin layer 53 may be a homopolyethylene terephthalate resin having a melting point of about 260 ° C., but is formed of a copolymer polyethylene terephthalate resin having a lower melting point in consideration of ease of pressure bonding described later. Specifically, those having a melting point in the range of about 150 ° C to 230 ° C are used.

  As shown in FIGS. 1 to 5, the paper container 1 includes a body member 10 and a bottom member 11. The body member 10 has an opening on one end side closed by the bottom member 11. The body member 10 is formed in a cylindrical shape having a gradually increasing diameter from the bottom member 11 toward the opening end.

  The body member 10 is formed by bending the laminated material 50 into a cylindrical shape and fixing both ends. In addition, the laminated material 50 which shape | molds the trunk | drum member 10 is one fan shape, Comprising: As shown in FIG.4 and FIG.8, it has the process part 61 formed by the skive hemming process in the one end side part. The processed portion 61 is provided with the second resin layer 53 on both sides thereof by skive hemming.

  As shown in FIGS. 1 and 3, the body member 10 includes a cylindrical body portion 21 in which the second resin layer 53 of the laminated material 50 is disposed on the inner side and the end portions of the fan-shaped laminated material 50 overlap each other. The laminated portion 22 is laminated, the flange curl portion 23 is formed at one end thereof, and the return portion 24 is formed at the other end and fixed to the bottom member 11.

  As shown in FIGS. 4 and 5, the laminated portion 22 is adjacent to the processed portion 61 and the processed portion 61 provided on one end side of the laminated material 50 so that the processed portion 61 is inside the trunk member 10. A part of the first resin layer 52 and the other end side of the laminated material 50 are laminated and fixed.

  As shown in FIG. 4, the laminated portion 22 is a welded portion in which the second resin layer 53 on the outer surface side of the processed portion 61 and the second resin layer 53 on the inner surface side of the other end of the laminated material 50 are laminated and welded. 62, and a wrap portion 63 on which the second resin layer 53 on the other end side is laminated and pressure-bonded to the first resin layer 52 adjacent to the processed portion 61. The second resin layer 53 is welded to the weld portion 62.

  In the wrap portion 63, the second resin layer 53 is laminated with the first resin layer 52 by a predetermined width, for example, 0.5 mm to 4 mm, preferably 1 mm to 2 mm, and has a predetermined tensile strength, specifically JIS-Z-. The adhesive strength measured according to 0238 is crimped at 0.5 N / 15 mm or more. Note that 0.5 N / 15 mm or more is based on the result of obtaining a good shape when the paper container 1 is actually manufactured.

  As shown in FIG. 1, the flange curl portion 23 is formed by bending the end portion of the body member 10 outward so that the cross-sectional shape thereof is circular or rectangular. The return portion 24 is formed by folding the other end of the body portion 21 inward.

  The bottom member 11 is made of the laminated material 50. The bottom member 11 includes a bottom portion 26 and a bent portion 27 in which the outer peripheral edge portion of the bottom portion 26 is bent by arranging the second resin layer 53 on the outer peripheral side.

  In the bottom member 11, the bent portion 27 is disposed between the barrel portion 21 and the return portion 24 of the barrel member 10, and the second resin layer 53 of the bent portion 27 is welded to the second resin layer 53 on the inner surface of the barrel portion 21. And it is fixed to the body member 10 by being pressure-bonded to the first resin layer 52 of the return portion 24.

Next, a method for manufacturing the paper container 1 configured as described above will be described below with reference to FIGS.
First, a method for forming the processed portion 61 of the laminated material 50 used for the body member 10 will be described. As shown in FIGS. 6 and 7, the first resin layer 52 and the substrate 51 on one end side of the fan-shaped laminated material 50 are cut to a predetermined depth by a rotary blade 80, a grinder, or the like. Moreover, in the cutting of the base material 51 and the first resin layer 52, the processing end end portion of the processing surface 51a of the base material 51 is formed substantially vertically, and the cutting end surface 51c is formed. This cutting process is called a so-called skive, and the base material 51 is removed from the first resin layer 52 side until the thickness becomes approximately half the thickness of the laminated material 50.

  Next, as shown in FIG. 7, a recess 51 b is provided in the vicinity of the approximate center in the width direction of the processed surface 51 a of the cut base material 51 along the extending direction of the end portion of the fan-shaped laminated material 50. . In addition, this hollow part 51b makes it easy to bend | fold the cut base material 51 mentioned later. Next, as shown in FIG. 8, the cut base material 51 and the second resin layer 53 are bent around the recess 51 b, and the base material 51 is opposed and fixed. This bending process is called so-called hemming.

  The fixing of the base material 51 is performed by applying an adhesive to the processing surface 51a and the cutting end surface 51c of the base material 51, and the processing surfaces 51a of the base material 51 that are bent and brought into contact with each other, and the cutting end surface 51c and the laminated material. The end surface 51d of one end side of 50 is bonded. Through these steps, the processed portion 61 is formed in the laminated material 50. Further, the contact portion where the cutting end surface 51 c and the end surface 51 d of the laminated material 50 are bonded serves as a boundary portion 55 between the first resin layer 52 and the second resin layer 53.

  Next, a method for manufacturing the paper container 1 will be described. First, as shown in FIG. 9 (S1), hot air H is blown and heated to a heating unit 50a that heats both ends of the laminated member 60 on which the processed unit 61 is formed. Note that the surface temperature of the heating part 50 a at both ends of the laminated material 50 is heated to about 180 ° C. by the blowing of the hot air H. In addition, the surface temperature of the heating part 50a by blowing hot air H is preferably in the range of 150 ° C to 230 ° C. Here, the heating unit 50a is a range in which the stacked units 22 described above are stacked on each other.

  Next, as shown in FIG. 9 (S2), the laminated material 50 is wound around the mandrel 100 formed in the shape of the body member 10 with the second resin layer 53 facing the mandrel 100, and the laminated material 50 is processed. The both sides of the laminated material 50 are laminated with the portion 61 inside.

Next, as shown in FIG. 9 (S3), the heating unit 50a (laminated portion 22) in which the laminated material 50 wound around the mandrel 100 in the shape of the body member 10 is moved about by the pressure applying device 101. Bonding is performed by applying a pressure of 0.38 N / mm ² . In addition, it is preferable that the pressure application apparatus 101 applies the pressure of the range of 0.1-1 N / mm < ² > to the laminated | stacked heating part 50a. By applying pressure with the pressure application device 101 after heating the heating unit 50a with the hot air H, the laminated unit 22 is welded between the second resin layers 53 in the welding unit 62 as shown in FIG. In the part 63, the first resin layer 52 and the second resin layer 53 are pressure-bonded, and the body member 10 is molded.

  Next, as shown in FIG. 9 (S4), the bottom member 11 in which the bent portion 27 is formed on the bottom portion 26 is placed at the tip of the mandrel 100 so that the bent portion 27 faces upward (outside). The body member 10 is put on the bottom member 11, and the bent portion 27 is inserted between the body portion 21 and the return portion 24. In this state, as shown in FIG. 9 (S5), hot air H is sprayed onto the end portion of the trunk portion 21, the return portion 24, and the bent portion 27 to heat them. After heating, as shown in (S6) of FIG. 9, pressure is applied to the body portion 21, the return portion 24, and the bent portion 27 using the crimping jig 102. As a result, the second resin layers 53 of the trunk portion 21 and the bent portion 27 are welded together, the second resin layer 53 of the return portion 24 and the first resin layer 52 of the bent portion 27 are pressure-bonded, and the bottom member is attached to the barrel member 10. 11 is fixed.

  Next, as shown in FIG. 9 (S 7), the hot air H is blown onto the opening end of the body member 10 and the curl molding die 103 is molded so that the winding amount is less than that of the flange curl portion 23. One curl 23a is formed.

  Next, as shown in FIG. 9 (S 8), hot air H is blown onto the first curl 23 a by the curl molding die 103, and the first curl 23 a is molded by the curl molding die 103. A flange curl portion 23 that is a curl is formed. After forming the flange curl part 23, the flange curl part 23 is crushed from above and below to flatten the upper surface of the flange curl part 23. Through these steps, the paper container 1 is formed.

  According to the paper container 1 configured as described above, the laminated portion 22 of the trunk member 10 is welded to the second resin layers 53 by the weld portion 62, and the wrap portion 63 adjacent to the weld portion 62 is The first resin layer 52 and the second resin layer 53, which are different resin materials, are pressure-bonded to have a predetermined adhesive strength.

  As a result, the boundary portion 55 of the processed portion 61 where the skive hemming processing portion has been performed is covered with the other end portion of the stacked laminated material 50, so that the boundary portion 55 of the processed portion 61 is not bent. For this reason, the paper container 1 can form the trunk | drum member 10 in the shape close | similar to a perfect circle by opening shape.

  More specifically, the boundary portion 55 of the processed portion 61 subjected to skive hemming is a portion where the cutting end surface 51c and the end surface 51d are adhered and brought into contact with each other with an adhesive or the like, and thus the strength thereof is weak. However, the paper container 1 welds the second resin layer 53 of the processed portion 61 and the second resin layer 53 on the other end side of the laminated material 50, and is adjacent to the processed portion 61 with a predetermined adhesive strength. A second resin layer 53 on the other end side of the resin layer 52 is pressure-bonded.

  Thereby, the laminated portion 22 is fixed with a predetermined adhesive strength and the boundary portion 55 is reinforced by the other end side of the laminated material 50 in which the paper container 1 is laminated. Even if stress is applied in the direction in which the body member 10 is bent, the opening shape of the body member 10 can be prevented from being deformed into an ellipse shape with the boundary portion 55 as a base point. For this reason, it becomes possible for the paper container 1 to make the shape of the opening end into a substantially perfect circle shape.

  As described above, according to the paper container 1 according to the embodiment of the present invention, even if the laminated material 50 using different resin materials on both sides is used, the opening shape can be improved.

(Second Embodiment)
Next, the structure of the paper container 1 which concerns on the 1st Embodiment of this invention is demonstrated using FIG.10 and FIG.11.
FIG. 10 is a cross-sectional view showing the configuration of the laminated portion 22A of the paper container 1A according to the second embodiment of the present invention, and FIG. . Note that, in the configuration of the paper container 1A according to the second embodiment, the same reference numerals are given to the same configurations as those of the paper container 1 according to the first embodiment described above, and detailed description thereof is omitted.

  The paper container 1 </ b> A is a so-called paper cup formed of the laminated material 50. The paper container 1 </ b> A includes a trunk member 10 </ b> A and a bottom member 11. The body member 10 </ b> A includes a body portion 21, a laminated portion 22 </ b> A in which end portions of the fan-shaped laminated material 50 are laminated, a flange curl portion 23, and a return portion 24.

As shown in FIG. 10, the laminated portion 22 </ b> A is formed by laminating and fixing a processed portion 61 </ b> A provided on one end side of the laminated material 50 and the other end side portion of the laminated material 50.
Next, a method for forming the processed portion 61A will be described with reference to FIGS.

  First, as shown in FIGS. 6 and 11, the first resin layer 52 and the substrate 51 at one end of the fan-shaped laminated material 50 are separated from the end surface 51 d at one end by a predetermined distance. The first resin layer 52 and the base material 51 at the end of one end side are left to be cut to a predetermined depth by a rotary blade 80, a grinder, or the like. As a result, as shown in FIG. 11, the base material 51 and the first resin layer 52 remain at one end of the laminated material 50, and the base material has a predetermined width and a predetermined depth. A part of 51 and the 1st resin layer 52 will be notched.

  Next, as shown in FIG. 11, a recess 51 b is provided near the approximate center in the width direction of the processed surface 51 a of the cut base material 51. Next, as shown in FIG. 11, the cut base material 51 and the second resin layer 53 are bent around the hollow portion 51 b so that the processing surfaces 51 a of the base material 51 face each other, and one end side portion The first resin layer 52 remaining on the substrate and the first resin layer 52 adjacent to the cut end surface 51c of the cut substrate 51 are fixed to face each other.

  The processed portion 61A applies an adhesive to the processing surface 51a to bond the processing surfaces 51a that are bent and in contact with each other and weld the first resin layers 52 to each other. As a result, the second resin layer 53 is positioned on the upper surface thereof, and the processed portion 61A that is firmly fixed between the first resin layers 52 is molded.

  In the thus configured paper container 1A, the upper surface of the processed portion 61A is covered with the second resin layer 53, and the boundary portion 55A of the processed portion 61A is firmly fixed by welding the first resin layers 52 to each other. . For this reason, the paper container 1A can firmly fix the laminated portion 22A by laminating and welding the second resin layers 53 in the laminated portion 22A. Further, since the boundary portion 55A of the processed portion 61A is formed along the outer shape of the formed body member 10A, the body member 10A is not deformed from the boundary portion 55A as a base point. 10A can be formed in a shape close to a perfect circle with an opening shape.

  As described above, according to the paper container 1 </ b> A according to the embodiment of the present invention, the processing unit 61 </ b> A in which the base materials 51 and the first resin layers 52 are fixed is used. Even if the laminated material 50 using different resin materials is used, the opening shape can be improved.

  The present invention is not limited to the above embodiment. In the example described above, only the configuration in which the first resin layer 52 is a polyethylene resin has been described, but the present invention is not limited to this. For example, the first resin layer 52 may be configured to be foamed by evaporating moisture in the base material 51 by heating to form a foam heat insulating layer. Moreover, the structure which provides an intermediate | middle layer further between the base material 51 and the 1st resin layer 52 and the base material 51 and the 2nd resin layer 53 may be sufficient. In addition, the said intermediate | middle layer is a resin layer by the ethylene vinyl alcohol copolymer which has high gas barrier property, for example. The intermediate layer may have another configuration.

  Moreover, although the 2nd resin layer 53 demonstrated the structure made into a polyethylene terephthalate resin in the example mentioned above, it is not limited to this. For example, polybutylene terephthalate resin, polyethylene naphthalate resin, polyethylene terephthalate / polybutylene terephthalate copolymer resin, and polyethylene terephthalate / polyethylene naphthalate copolymer resin may be used. Similarly, the first resin layer 52 may be another resin material as long as it is a resin different from the second resin layer 53 and is difficult to weld to each other.

  Furthermore, in the example described above, the bottom member 11 has a configuration in which the first resin layer 52 is formed on one surface and the second resin layer 53 is formed on the other surface, but the configuration is not limited thereto. For example, the second resin layer 53 may be formed on both surface layers. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1, 1A ... Paper container 10, 10A ... Body member, 11 ... Bottom member, 21 ... Body part, 22, 22A ... Laminate part, 23 ... Flange curl part, 24 ... Return part, 26 ... Bottom part, 27 ... Bending part 50 ... Laminated material, 50a ... Heating part, 51 ... Base material, 51a ... Treatment surface, 51c ... Cutting end face, 51b ... Indented part, 51d ... End face, 52 ... First resin layer, 53 ... Second resin layer, 55 55A ... Boundary part, 60 ... Laminated member, 61, 61A ... Processed part, 62 ... Welding part, 63 ... Lap part.

Claims (7)

The base material formed of a paper material and the second resin layer of a laminated material having a first resin layer and a second resin layer formed of different resin materials on both main surfaces of the base material are disposed inside the base material. And a processed portion having the second resin layer formed on one end side of the laminated material by a skive hemming process in which the first resin layer and a part of the base material are removed and bent. The second resin layer of the laminated material is laminated with the other end side portion of the laminated material, and the second resin layer of the processed portion and the other end side portion is welded to each other, and the first resin layer adjacent to the processed portion and the other A body member formed into a cylindrical shape by crimping the second resin layers of the end sides;
A bottom member that closes an opening at one end of the body member;
A paper container comprising:   2. The paper container according to claim 1, wherein the second resin layer is formed of a polyester-based resin, and the first resin layer is formed of a resin material different from that of the second resin layer. The first resin layer is formed of a polyethylene resin,
The paper container according to claim 2, wherein the second resin layer is formed of a polyethylene terephthalate resin.   The paper container according to any one of claims 1 to 3, wherein the first resin layer and the second resin layer are pressure-bonded with an adhesive strength of 0.5 N / 15 mm or more. The base material formed of a paper material and the second resin layer of a laminated material having a first resin layer and a second resin layer formed of different resin materials on both main surfaces of the base material are disposed inside the base material. In addition, the one end side portion of the laminated material is bent by removing the first resin layer and a part of the base material by leaving the first resin layer at the end portion of the one end side portion, and leaving the first resin layer. Further, a processed portion having the second resin layer on both principal surfaces formed by skive hemming for welding the first resin layer and the first resin layer of the laminated material is located on the inner side of the laminated material. A body member that is laminated with the other end side part, and is formed into a cylindrical shape by welding the second resin layer of the processed part and the other end side part;
A bottom member that closes an opening at one end of the body member;
A paper container comprising:   The paper container according to claim 5, wherein the second resin layer is formed of a polyester-based resin, and the first resin layer is formed of a resin material different from that of the second resin layer. The first resin layer is formed of a polyethylene resin,
The paper container according to claim 6, wherein the second resin layer is made of polyethylene terephthalate resin.

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