CN112978004B - Cup-shaped container and method for manufacturing same - Google Patents
Cup-shaped container and method for manufacturing same Download PDFInfo
- Publication number
- CN112978004B CN112978004B CN202011489945.6A CN202011489945A CN112978004B CN 112978004 B CN112978004 B CN 112978004B CN 202011489945 A CN202011489945 A CN 202011489945A CN 112978004 B CN112978004 B CN 112978004B
- Authority
- CN
- China
- Prior art keywords
- heat
- main body
- fusible resin
- cup
- metal foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
- B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
- B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
- B65D85/78—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials for ice-cream
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Packages (AREA)
Abstract
The present invention relates to a cup-shaped container and a method for manufacturing the same. Provided is a cup-shaped container which can be manufactured at low cost by using a paper cup manufacturing facility, is excellent in long-term storage stability of the contents, and can be sterilized by aseptic sterilization or retort sterilization, while suppressing deterioration or the like caused by contact with the contents. The cup-shaped container includes: a main body formed by interlacing and joining both end edges of a main body blank to each other to form a tubular shape; and a base body formed by molding a blank for the base body to form a base and a hanging portion. The outer surface of the depending portion engages the inner surface of the lower end of the body. The body material and the base material are each formed of a laminate including a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer. In the staggered portion of the main body, the inner end surface of the main body preform is covered with the inner resin reservoir.
Description
Technical Field
The present invention relates to a cup-shaped container containing food, beverage, etc. such as ice cream and yogurt, and a method for producing the same.
Background
As a container for filling and packaging semisolid dairy products such as ice cream and yogurt, a cup-shaped container made of paper, that is, a paper cup is generally used.
Paper cups are generally formed by joining a main body formed of paper blanks each cut into a predetermined shape to a base body. In more detail, the body is formed as follows: the two end edges of the substantially fan-shaped body material are staggered (overlapped) and joined to form a cylindrical shape, and a folded-back portion folded back inward is formed at the lower end opening edge, and a flange portion curled outward is formed at the upper end opening edge. The base body has a substantially inverted U-shaped cross section and is formed by skirt-forming a substantially circular base body blank so as to form a hanging portion at the outer peripheral portion thereof. Further, the hanging portion of the base is engaged by the folded portion of the main body, thereby integrating the main body with the base.
Each of the blanks for the main body and the base body is formed of, for example, a laminate having a paper layer formed of plain base paper, acid-resistant paper, coated paper, or the like, and a polyethylene resin (PE) layer laminated on one or both sides of the paper layer (for example, see patent document 1 below).
As a material of each blank, a paper cup is also known, in which a laminate of a paper layer and a polyethylene resin (PE) layer and a barrier layer made of aluminum foil or the like is laminated (for example, see patent document 2 below).
As containers for ice cream, yogurt, and the like, containers formed from plastic molded bodies such as polypropylene resin (PP) are also known (for example, see patent document 3 below).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 58-30955
Patent document 2: japanese patent laid-open No. 2007-210639
Patent document 3: japanese patent laid-open No. 2007-17685
Disclosure of Invention
Problems to be solved by the invention
However, paper cups are excellent in productivity and can be manufactured at low cost, but on the other hand, they are low in barrier property and are not suitable for long-term storage of contents.
In the case of paper cups with a barrier layer such as aluminum foil, the long-term storage property of the contents is improved, but water easily intrudes from the end face of the paper layer, and steam sterilization is not performed.
In addition, in the case of a plastic container, the manufacturing equipment is costly and is not suitable for long-term storage of the contents.
In order to solve the above-described problems, the inventors of the present application have heretofore proposed a cup-shaped container using a laminate formed of a metal foil layer and a heat-fusible resin layer laminated on at least one of both surfaces thereof as materials of a base material and a body material (japanese patent application No. 2019-106125).
According to the cup-shaped container, the cup-shaped container can be manufactured at low cost by using the paper cup manufacturing equipment, and the contents are excellent in long-term storage property and can be sterilized by aseptic sterilization or retort sterilization.
Here, in the case of the cup-shaped container, since the inner end face of the body preform located inside the container is exposed to the content at the staggered portion of the body, there is a possibility that deterioration due to delamination (delamination) and corrosion may occur at the inner end face depending on the type of the content or the like, and there is a case where it is not preferable from the viewpoint of hygiene.
In the case of the cup-shaped container, if the both end edges of the body blank are joined to each other and the body and the base are not sufficiently joined, there is a possibility that the sealability of the container is lowered and the contents may leak. On the other hand, if the sealing conditions are strict in order to improve the bonding strength, there is a possibility that deformation or the like occurs at the bonded portion, and the appearance of the container is impaired.
The present invention aims to provide a cup-shaped container which can be manufactured at low cost by using paper cup manufacturing equipment, can inhibit degradation and the like caused by contact with contents, has excellent long-term storage property of the contents, and can be sterilized by aseptic sterilization and retort sterilization.
Another object of the present invention is to provide a method for manufacturing a cup-shaped container, which can more reliably join both end edges of a body blank and a body to a base without causing defects in appearance such as deformation of the container, and can improve the sealability of the container.
Means for solving the problems
The present invention includes the following means for achieving the above object.
1) A cup-shaped container, comprising:
a main body formed by interlacing and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
in the cup-shaped container, the main body and the bottom body are integrated by joining the inner surface of the lower end of the main body to the outer surface of the hanging part of the bottom body,
the body blank is formed from a laminate comprising a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the mutually overlapping surfaces of the both end edge portions to each other,
The base blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the upper side of the base of the two sides of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting these sides to each other,
in the cup container, at the staggered portion of the main body, the inner end surface of the main body preform located inside the main body is covered with an inner resin reservoir formed when the heat-sealable resin layers at both end edges of the main body preform are heat-sealed to each other.
2) The cup-shaped container according to 1) above, wherein when the thickness of the metal foil layer in the body blank is T1, the thickness of the inner heat-fusible resin layer located inside the body is T2, and the thickness of the outer heat-fusible resin layer located outside the body is T3, T1: t2: t3=1: 0.3 to 1.5:0.2 to 1, and T2 is more than or equal to T3.
3) The cup-shaped container according to 1) or 2), wherein the melt Mass Flow Rate (MFR) of the inner heat-fusible resin layer located inside the body in the body preform is 1 to 10g/10 min.
4) The cup-shaped container according to any one of 1) to 3), wherein the inner heat-fusible resin layer located inside the body in the body preform comprises 2 or more thermoplastic resin layers, wherein the sealing side thermoplastic resin layer constituting the inner surface of the body of the thermoplastic resin layers has a melt Mass Flow Rate (MFR) of 3 to 10g/10 minutes, and wherein the lamination side thermoplastic resin layer laminated on the metal foil layer of the thermoplastic resin layers has a melt Mass Flow Rate (MFR) of 3 to 10g/10 minutes.
5) The cup-shaped container according to any one of 1) to 4), wherein an inner end surface of the body blank is formed as an inclined surface facing an outer side of the body.
6) The cup-shaped container according to any one of 1) to 5), wherein, in the body material, a stepped portion bent in a crank shape so as to face an inner end face of the body material is formed in a portion adjacent to an outer end edge portion which is an outer side of the body, of the staggered both end edge portions, and an inner resin reservoir is formed between the stepped portion and the inner end face of the body material.
7) The cup-shaped container according to any one of 1) to 6), wherein the outer end surface of the body preform located outside the body is further covered with an outer resin reservoir formed when the heat-fusible resin layers of both end edges of the body preform are heat-fused to each other at the staggered portion of the body.
8) A cup-shaped container, comprising:
a main body formed by interlacing and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
In the cup-shaped container, the main body and the bottom body are integrated by joining the inner surface of the lower end portion of the main body to the outer surface of the hanging portion of the bottom body, the cup-shaped container is characterized in that,
the body blank is formed from a laminate comprising a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the mutually overlapping surfaces of the both end edge portions to each other,
the base blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the upper side of the base of the two sides of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting these sides to each other,
in the cup-shaped container, at least one of the 2 heat-fusible resin layers of the body blank includes 2 or more layers, and the heat-fusible resin constituting the laminated side heat-fusible resin layer laminated on the metal foil layer among the 2 or more layers has a lower melting point than the heat-fusible resin constituting the other layers,
At the staggered portion of the main body, the metal foil layer portion of the inner end face of the main body blank located inside the main body and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with a protective film formed by melting and solidifying the heat-fusible resin constituting the laminate-side heat-fusible resin layer when the heat-fusible resin layers of both end edges of the main body blank are heat-fused to each other.
9) The cup-shaped container according to 8), wherein the metal foil layer portion located on the outer end face of the body blank outside the body and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with a protective film formed by melt-curing the heat-fusible resin constituting the laminate-side heat-fusible resin layer when the heat-fusible resin layers at both end edges of the body blank are heat-welded to each other at the staggered portion of the body.
10 The cup-shaped container according to 8) or 9), wherein the melting point of the heat-fusible resin constituting the laminate-side heat-fusible resin layer is lower than the melting point of the heat-fusible resin constituting the other layers by at least 10 ℃.
11 The cup-shaped container according to the above 10), wherein the melting point of the heat-fusible resin constituting the laminate-side heat-fusible resin layer is 110 to 140 ℃.
12 The cup-shaped container according to any one of the above 8) to 11), wherein the melt Mass Flow Rate (MFR) of the heat-fusible resin constituting the laminate-side heat-fusible resin layer is 1 to 5g/10 minutes or more greater than the melt Mass Flow Rate (MFR) of the heat-fusible resin constituting the other layers.
13 The cup-shaped container according to the above 12), wherein the melt Mass Flow Rate (MFR) of the heat-fusible resin constituting the laminate-side heat-fusible resin layer is 4 to 10g/10 min.
14 A method for manufacturing a cup-shaped container 1) or 8), comprising:
punching a laminate including a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer to form a body blank;
punching a laminate including a metal foil layer and a heat-fusible resin layer laminated on at least an upper surface of a base of both surfaces of the metal foil layer to form a base blank;
forming a bottom body having a substantially inverted U-shaped cross section by drawing a blank for the bottom body to form a bottom portion and a hanging portion extending downward from an outer peripheral edge portion of the bottom portion;
A step of forming a tubular body by interlacing both end edges of a body blank and thermally welding thermally weldable resin layers constituting mutually overlapping surfaces of the both end edges; and
a step of integrating the main body with the base by overlapping the inner surface of the lower end portion of the main body with the outer surface of the hanging portion of the base and thermally welding the thermally weldable resin layers constituting the surfaces to each other,
in the above manufacturing method, in the step of forming the tubular body, the heat-sealable resin layers at both end edges of the body blank are heat-sealed 2 times, and the heat-sealing at the 2 nd time is heat-sealed by high-frequency sealing.
15 A method of manufacturing a cup-shaped container, comprising:
punching a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the inner side of the metal foil layer to form a body blank;
punching a laminate including a metal foil layer and a heat-fusible resin layer laminated on at least an upper surface of a base of both surfaces of the metal foil layer to form a base blank;
forming a bottom body having a substantially inverted U-shaped cross section by drawing a blank for the bottom body to form a bottom portion and a hanging portion extending downward from an outer peripheral edge portion of the bottom portion;
A step of overlapping both end edge portions of a body material and thermally welding thermally weldable resin layers constituting the overlapping surfaces of both end edge portions to each other to form a tubular body; and
a step of integrating the main body and the base body by overlapping the inner surface of the lower end portion of the main body with the outer surface of the hanging portion of the base body and thermally welding the thermally weldable resin layers constituting the surfaces to each other,
in the step of forming the tubular body, the heat-sealable resin layers at both end edges of the body preform are heat-sealed 2 times, and the 2 nd heat-sealing is heat-sealed by high-frequency sealing.
16 The method for manufacturing a cup-shaped container according to the above 15), wherein in the step of forming the body blank, a laminate in which heat-fusible resin layers are laminated on both sides of a metal foil layer is used as the laminate,
in the step of forming the tubular body, both end edge portions of the body blank are overlapped in a palm-like shape, and heat-fusible resin layers constituting mutually overlapped surfaces of the both end edge portions are bonded to each other by performing 1 st heat-welding, thereby forming the tubular body having the palm-like portion, and then the palm-like portion is bonded to the outer surface of the body by performing 2 nd heat-welding by high-frequency sealing in a state where the palm-like portion is bent to one side and overlapped with the outer surface of the body.
17 The method for manufacturing a cup-shaped container according to any one of 14) to 16), wherein in the step of integrating the main body and the base, the heat-fusible resin layers of the lower end portion of the main body and the hanging portion of the base are heat-fused to each other 2 times, and the 2 nd heat-fusion is heat-fused by high-frequency sealing.
18 A method of manufacturing a cup-shaped container, comprising:
punching a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the inner side of the metal foil layer to form a body blank;
punching a laminate including a metal foil layer and a heat-fusible resin layer laminated on at least an upper surface of a base of both surfaces of the metal foil layer to form a base blank;
forming a bottom body having a substantially inverted U-shaped cross section by drawing a blank for the bottom body to form a bottom portion and a hanging portion extending downward from an outer peripheral edge portion of the bottom portion;
a step of overlapping both end edge portions of a body material and thermally welding heat-fusible resin layers constituting the overlapping surfaces of both end edge portions to each other to form a tubular body; and
A step of integrating the main body and the base body by thermally welding heat-fusible resin layers constituting the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base body,
in the step of integrating the main body and the base, the heat-sealable resin layers at the lower end portion of the main body and the hanging portion of the base are heat-sealed 2 times, and the heat-sealing at the 2 nd time is heat-sealed by high-frequency sealing.
19 The method for manufacturing a cup-shaped container according to 17) or 18), wherein in the step of forming the base material, a laminate in which heat-fusible resin layers are laminated on both sides of a metal foil layer is used as the laminate,
in the step of integrating the main body with the base, the main body is folded back inward from the lower end opening edge portion thereof so as to enclose the hanging portion of the base, and the main body and the base are integrated by heat-welding the heat-fusible resin layers constituting the surfaces of the lower end portion of the main body and the hanging portion of the folding portion and the base to each other, and the heat-welding of the heat-fusible resin layers of the lower end portion of the main body and the hanging portion of the folding portion and the base is performed 2 times, and the 2 nd heat-welding is performed by high-frequency sealing.
Effects of the invention
According to the cup-shaped container of 1), since the inner end surface of the body preform located inside the body is covered with the inner resin reservoir formed when the heat-fusible resin layers of the both end edges of the body preform are heat-fused to each other at the staggered portion of the body without being exposed to the contents, deterioration due to delamination and corrosion of the inner end surface can be effectively suppressed, and the cup-shaped container is also desirable in terms of hygiene.
The cup-shaped container according to 2) to 6) above can more reliably exhibit the above-described effects of the cup-shaped container of 1) above.
According to the cup-shaped container of 7), since the outer end surface of the body preform located outside the body is also covered with the outer resin reservoir formed when the heat-fusible resin layers of the both edge portions of the body preform are heat-fused to each other at the staggered portion of the body, deterioration due to delamination and corrosion of the outer end surface can be effectively suppressed.
According to the cup-shaped container of 8), the metal foil layer portion of the inner end face of the body blank located inside the body and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with the protective film formed by melting and solidifying the low-melting heat-fusible resin in the laminated heat-fusible resin layer among the heat-fusible resin layers constituting the body blank including 2 or more layers at the time of heat welding, so that deterioration due to delamination and corrosion of the inner end face can be effectively suppressed, and the cup-shaped container is also desirable in terms of hygiene.
In the case of specifying the present invention, the "melting point" means a melting peak temperature (Tmp) measured by Differential Scanning Calorimetry (DSC) based on JIS K7121-1987.
According to the cup-shaped container of 9), the metal foil layer portion and the interface portion between the metal foil layer and the heat-fusible resin layer on the outer end face of the body blank located on the outer side of the body are also covered with the protective film formed by melt-curing the low-melting heat-fusible resin in the laminate-side heat-fusible resin layer among the heat-fusible resin layers comprising 2 or more layers constituting the body blank at the time of heat welding, so that deterioration due to delamination and corrosion of the outer end face can be effectively suppressed.
The cup-shaped container according to 10) to 13) above can more reliably exhibit the above-described effects of the cup-shaped container of 8) or 9) above.
According to the method for manufacturing a cup-shaped container of 14) or 15), the heat-fusible resin layers at the both end edges of the body blank are heated and heat-fused from the metal foil layer heated to a high temperature by induction heating of high-frequency sealing, so that the both end edges of the body blank can be joined to each other more reliably, and resin pools can be easily formed at the corresponding joining portions with the heat fusion, whereby not only the sealability of the container can be improved, but also defects in appearance such as deformation of the container with the heat fusion can be effectively suppressed.
According to the method for manufacturing a cup-shaped container of 16), delamination and the like can be suppressed by making both end surfaces of the body material not contact with the content, and the container which is easy and sanitary to sterilize can be manufactured simply by making the surface contacting with the content of 1 resin.
Further, according to the method for manufacturing a cup-shaped container of 16), since the step of joining the palm portion of the main body to the outer surface of the main body can be performed by heating from the metal foil layer by ultrasonic sealing, the heat for heat welding is uniformly transferred to each heat-fusible resin layer, and therefore the joining of both can be performed more reliably, which is also advantageous in terms of manufacturing efficiency.
According to the method for manufacturing a cup-shaped container of 17) or 18), the lower end portion of the main body and the hanging portion of the base body are more reliably joined by high-frequency sealing, and resin is easily accumulated at the corresponding joint portion due to heat welding, whereby not only can the sealability of the container be improved, but also the occurrence of defects in appearance such as deformation due to heat welding can be effectively suppressed.
The method of manufacturing a cup-shaped container according to 19) above, including the inside of the folded portion, can further improve the sealability of the joined portion between the main body and the base.
Drawings
Fig. 1 is a perspective view of a cup-shaped container according to embodiment 1 of the present invention.
Fig. 2 is a vertical sectional view taken along line II-II of fig. 1, in which a portion surrounded by a single-dot chain line a is an enlarged view of a portion surrounded by a single-dot chain line a, and a portion surrounded by a single-dot chain line B is an enlarged view of a portion surrounded by a single-dot chain line B.
Fig. 3 (a) is an enlarged cross-sectional view showing the layer structure of the laminate of materials as a base material, and (b) is an enlarged cross-sectional view showing the layer structure of the laminate of materials as a base material.
Fig. 4 (a) is an enlarged cross-sectional view showing the layer structure of the laminate of the material as the base material, and (b) is an enlarged cross-sectional view showing the layer structure of the laminate of the material as the base material, and is a diagram showing a mode in which each heat-fusible resin layer has a 3-layer structure.
Fig. 5 is a horizontal cross-sectional view showing an enlarged manner of the staggered portion of the main body in the cup-shaped container.
Fig. 6 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 7 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 8 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 9 (a) is a plan view of a body material, and (b) is a perspective view of a body molded from the body material.
Fig. 10 (a) is a plan view of a base material, and (b) is a perspective view of a base molded from the base material.
Fig. 11 is a vertical sectional view showing a part of the manufacturing process of the cup-shaped container.
Fig. 12 is an enlarged partial vertical cross-sectional view showing a modification of the connection structure between the main body and the base in the cup-shaped container.
Fig. 13 is a diagram showing a cup-shaped container according to embodiment 2 of the present invention, (a) is an enlarged cross-sectional view showing a layer structure of a laminate of materials as a base material, and (b) is an enlarged cross-sectional view showing a layer structure of a laminate of materials as a base material, and is a diagram showing a mode in which each heat-fusible resin layer has a 2-layer structure.
Fig. 14 (a) is an enlarged cross-sectional view showing the layer structure of the laminate of the material as the base material, and (b) is an enlarged cross-sectional view showing the layer structure of the laminate of the material as the base material, and is a diagram showing a mode in which each heat-fusible resin layer has a 3-layer structure.
Fig. 15 is a horizontal cross-sectional view showing an enlarged manner of the staggered portion of the main body in the cup-shaped container.
Fig. 16 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 17 is a horizontal cross-sectional view showing an enlarged cross-section of a body in a cup-shaped container according to embodiment 4 of the present invention.
Fig. 18 is a horizontal cross-sectional view sequentially showing a part of the process of manufacturing the main body of the cup-shaped container.
Fig. 19 is a horizontal cross-sectional view of a cup-shaped container according to embodiment 5 of the present invention, in which a portion surrounded by a one-dot chain line C is shown in an enlarged manner.
Fig. 20 is a horizontal cross-sectional view showing a part of a process for manufacturing the main body of the cup-shaped container.
Fig. 21 is a diagram showing a cup-shaped container according to embodiment 6 of the present invention, and is a horizontal cross-sectional view showing an enlarged manner of the staggered portion of the body.
Fig. 22 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 23 is a diagram showing a cup-shaped container according to embodiment 7 of the present invention, and is a horizontal cross-sectional view showing an enlarged manner of the staggered portion of the body.
Fig. 24 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 25 is an enlarged partial cross-sectional view sequentially showing a step of forming a hot press portion at an inner end portion of a body blank.
Fig. 26 is a diagram showing a cup-shaped container according to embodiment 8 of the present invention, and is a horizontal cross-sectional view showing an enlarged manner of the staggered portions of the main body in the cup-shaped container.
Fig. 27 is a horizontal cross-sectional view showing an enlarged view of another mode of the staggered portion of the main body in the cup-shaped container.
Fig. 28 is a horizontal cross-sectional view showing an enlarged view of a further alternative form of the staggered portion of the main body in the cup-shaped container.
Fig. 29 is an enlarged partial cross-sectional view taken along line XXIX-XXIX of fig. 9 (a), and (a) to (c) respectively show 3 modes differing in cross-sectional shape.
Description of the reference numerals
1. 1X, 1Y: cup-shaped container
2: main body
2a: lower end of main body
21: staggered part
21Y: palm closing part
23: flange part
20A: blank for body
20: laminate body
201: metal foil layer
202: inner heat-fusible resin layer
202a: sealing side thermoplastic resin layer
202b: laminate side thermoplastic resin layer
203: outer heat-fusible resin layer
203a: sealing side heat-fusible resin layer
203b: laminated side heat-fusible resin layer
204. 204X: inner end face
205: outer end face
206: layer difference part
3: bottom body
31: bottom part
32: hanging part
30A: blank for base
30: laminate body
301: metal foil layer
302: upper heat-fusible resin layer
303: lower heat-fusible resin layer
R1: inner resin reservoir
R2: outer resin reservoir
M1: protective coating
M2: protective coating
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to fig. 1 to 29.
In the following description, "up and down" refers to up and down (for example, up and down of fig. 2, 11, and 12) of the cup-shaped container, the main body, and the bottom body, and "inside" refers to one side (for example, lower side of fig. 5 to 8, 15, 16, 21 to 24, 26 to 28, and right side of fig. 11 and 12) of the cup-shaped container, the main body, and the bottom body near the center, and "outside" refers to one side (for example, upper side of fig. 5 to 8, 15, 16, 21 to 24, and 26 to 28, and left side of fig. 11 and 12) of the cup-shaped container, the main body, and the bottom body, respectively.
Fig. 1 and 2 show the overall configuration of a cup-shaped container 1 according to embodiment 1 of the present invention, in which a body 2 molded from a body blank 20A and a base 3 molded from a base blank 30A are joined and integrated together in the container 1.
As shown in fig. 9, the body 2 has a tapered cylindrical structure, and is formed by interlacing and bonding both end edges of a body blank 20A formed in a fan shape. Therefore, the body 2 has the staggered portion 21 extending in the height direction thereof.
A folded portion 22 folded back inward is formed at the lower end opening edge portion of the main body 2.
Further, a flange 23 is provided at an upper end opening edge of the main body 2, and is bent outward. The flange 23 is folded back downward and formed into a substantially horizontal flat shape. The flange portion may be formed in a shape of a substantially circular arc in cross section by being curled downward in a manner other than the illustrated one, for example.
The base body 3 has a substantially inverted U-shaped cross-section, and includes a horizontal base 31 formed in a circular shape and a hanging portion 32 extending downward from an outer peripheral edge portion of the base 31, and is formed by drawing a circular base body blank 30A as shown in fig. 10.
The outer surface of the hanging portion 32 of the base 3 is joined to the inner surface of the lower end portion 2a of the main body 2, and the folded portion 22 of the main body 2 is joined to the inner surface of the hanging portion 32, whereby the main body 2 and the base 3 are integrated (see fig. 2 and 11).
As shown in the modification example in fig. 12, the folded portion 22 may not be formed at the lower end opening edge portion of the main body 2, and the main body 2 and the base 3 may be integrated only by a coupling structure in which the outer surface of the hanging portion 32 of the base 3 is joined to the inner surface of the lower end portion 2a of the main body 2. According to this structure, even when a plurality of wrinkles are generated in the hanging portion 32 during molding of the base body 3, air or the like is not mixed, and the lower end portion 2a of the main body 2 and the hanging portion 32 of the base body 3 can be reliably sealed.
As shown in fig. 3 (a), the body material 20A is formed of a laminate 20, and the laminate 20 includes: a metal foil layer 201; an inner heat-fusible resin layer 202 laminated on the inner surface of the main body 2 of the two surfaces of the metal foil layer 201; and an outer heat-fusible resin layer 203 laminated on the outer surface of the main body 2, which is one of the two surfaces of the metal foil layer 201, wherein the main body material 20A does not have a paper layer.
As shown in fig. 3 (b), the base material 30A is formed of a laminate 30, and the laminate 30 includes: a metal foil layer 301; an upper heat-fusible resin layer 302 laminated on the upper surface of the base body 3, out of the two surfaces of the metal foil layer 301; and a lower heat-fusible resin layer 303 laminated on the lower surface of the base body 3, which is one of the two surfaces of the metal foil layer 301, wherein the base body blank 30A does not have a paper layer.
The thickness of each laminate 20, 30 is preferably less than 250 μm, more preferably less than 200 μm. By setting the thickness of each of the laminated bodies 20 and 30 to the above range, it is possible to reliably avoid problems such as an excessive level difference in the portion of the flange portion 23 of the main body 2 formed by the staggered portion 21, or unstable joining of the lower end portion 2a of the main body 2 and the folded portion 22 to the hanging portion 31 of the base body 3, as in the case of paper cups using laminated bodies having a thickness of about 250 to 400 μm as a material of the blank.
The metal foil layers 201, 301 function as a barrier layer for protecting the contents from gas, water vapor, light, and the like.
As the metal foil constituting the metal foil layers 201 and 301, aluminum foil, iron foil, stainless steel foil, copper foil, or the like can be used, and aluminum foil is preferably used. In the case of aluminum foil, both of pure aluminum foil and aluminum alloy foil may be soft and hard, and for example, when it is a soft material (O material) after completion of annealing treatment of a8000 system (in particular, a8079H, A8021H) classified according to JIS H4160, it is excellent in formability, and thus can be preferably used. Further, when a hard material (H material) is applied to the aluminum foil constituting the metal foil layers 201 and 301 (particularly, the metal foil layer 201 of the main body blank 20A), it is considered that the strength of the flange portion 23 is improved, deformation of the flange portion 23 due to unexpected impact can be suppressed, and further, the shape retention of the entire cup-shaped container 1 is improved.
The metal foil layers 201 and 301 are subjected to a substrate treatment such as a chemical conversion treatment on both sides, as necessary. Specifically, for example, a surface of a metal foil subjected to degreasing treatment is coated with an aqueous solution of any one of the following 1) to 3), and then dried, and a chemical conversion treatment is performed to form a coating film:
1) Contains phosphoric acid;
chromic acid; and
aqueous solution of a mixture of at least 1 compound selected from the group consisting of metal salts of fluorides and nonmetallic salts of fluorides
2) Contains phosphoric acid;
at least 1 resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins; and
aqueous solutions of mixtures of at least 1 compound selected from the group consisting of chromic acid and chromium (III) salts
3) Contains phosphoric acid;
at least 1 resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins;
at least 1 compound selected from the group consisting of chromic acid and chromium (III) salts; and
an aqueous solution of a mixture of at least 1 compound selected from the group consisting of metal salts of fluorides and nonmetallic salts of fluorides.
The film formed on the surface of the metal foil layer 201, 301 by the chemical conversion treatment preferably has a chromium adhesion amount (per one side) of 0.1mg/m 2 ～50mg/m 2 Particularly preferably 2mg/m 2 ～20mg/m 2 。
The thickness of the metal foil layers 201, 301 is preferably 40 to 200. Mu.m, more preferably 80 to 160. Mu.m. By setting the thickness of the metal foil layers 201 and 301 to the above range, sufficient barrier properties and molding processability can be obtained.
The heat-fusible resin layers 202, 203, 302, 303 constitute the inner and outer surfaces of the container 1, and function to protect the metal foil layers 201, 301 and impart moldability to the laminate 20, 30, and also function as heat-fusible layers when joining the both end edges of the body blank 20A to each other and joining the lower end 2a of the body 2 and the folded-back portion 22 to the hanging portion 32 of the base 3.
The heat-fusible resin layers 202, 203, 302, 303 are composed of, for example, a general-purpose film such as a polypropylene (PP) film or a Polyethylene (PE) film having heat-fusible properties, or a composite film obtained by bonding these films, and particularly, an unstretched polypropylene film (CPP) excellent in heat resistance and drawing moldability is preferable. The heat-fusible resin layers 202, 203, 302, 303 may be formed of a coating layer of maleic acid-modified polyethylene, maleic acid-modified polypropylene, ethylene-vinyl acetate, epoxy resin, shellac resin, or the like, instead of the film.
The thickness of the heat-fusible resin layers 202, 203, 302, 303 is preferably 5 to 80 μm, more preferably 10 to 60 μm. By setting the thicknesses of the heat-fusible resin layers 202, 203, 302, 303 to the above-described ranges, sufficient adhesive strength can be obtained at the joint between the both end edges of the body blank 20A, the lower end 2a of the body 2, and the joint between the folded-back portion 22 and the hanging portion 32 of the base body 3, and the difference in layer of the portion constituted by the staggered portions 21 on the upper surface of the flange portion 23 of the body 2 can be made gentle, so that the sealing property at the time of sealing with the lid material is good.
The metal foil constituting the metal foil layers 201 and 301 and the film constituting the heat-fusible resin layers 202, 203, 302, and 303 are laminated by, for example, a dry lamination method via an adhesive layer (not shown). For example, a two-part curable polyester-polyurethane adhesive or polyether-polyurethane adhesive is used as the adhesive layer.
Due to the presence of the adhesive layer, for example, in the case where the heat-fusible resin layers 202 and 203 at both end edges of the body blank 20A are thinned by heat welding at the staggered portion 21 of the body 2, the metal foil layers 201 are prevented from contacting each other, and thus the sealing property is maintained. In addition, if the adhesive layer is present, even when the content passing through the heat-fusible resin layers 202, 203, 302, and 303 is filled, the metal foil layers 201 and 301 can be prevented from corroding and the content can be prevented from leaking.
The laminate 20 constituting the body material 20A and the laminate 30 constituting the base material 30A are usually the same, but may be different in material and/or thickness.
Next, an example of a method of forming the cup-shaped container 1 using the laminated bodies 20 and 30 will be described.
First, the laminate 20 is punched out into a fan shape of a predetermined size to form a body material 20A (see fig. 9 (a)).
The laminate 30 is punched out into a circular shape of a predetermined size to form a base material 30A (see fig. 10A), and the base material 30A is subjected to drawing forming processing using a die (not shown), whereby a base 3 having a substantially inverted U-shaped cross section including the bottom portion 31 and the hanging portion 32 is formed (see fig. 10 b). No wrinkles are generated on the manufactured base body 3. In addition, the corner portion between the bottom 31 and the hanging portion 32 in the outer surface of the bottom body 3 forms an angle.
Then, the base 3 is previously set on a substantially conical trapezoidal mold (not shown) so that the upper surface of the bottom 31 overlaps the top surface of the mold, the body material 20A is wound around the outer peripheral surface of the mold, and after the both end edges thereof are staggered, the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the overlapping surfaces of the staggered portions 21 are heat-fused, thereby forming the tapered tubular body 2. The heat sealing means of the staggered parts 21 may be high-frequency sealing, ultrasonic sealing, or the like, in addition to heat sealing using a hot plate.
Next, as shown in fig. 11, the lower end opening edge portion of the main body 2 is turned back inward, and after the turned back portion 22 is pressed against the suspended portion 32 of the base 3 by a disk-shaped rotary mold (not shown), the inner heat-fusible resin layer 202, which constitutes the surface where the lower end portion 2a of the main body 2 and the turned back portion 22 overlap with the suspended portion 32 of the base 3, is heat-fused with the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303, whereby the main body 2 and the base 3 are joined together.
The flange 23 (see fig. 11) is formed by crimping the upper end opening edge portion of the main body 2 to the outside using a predetermined crimping die (not shown) and pressing the crimped portion in the up-down direction to be flat.
In this way, the cup-shaped container 1 shown in fig. 1 and 2 was produced.
The cup-shaped container 1 of embodiment 1 has the following features in terms of the constitution of the staggered portion 21 of the body 2.
That is, as shown in fig. 5, the inner end face 204 of the body preform 20A located inside the body 2 is covered with an inner resin reservoir R1 formed when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the both end edges of the body preform 20A overlapping each other are heat-fused.
The outer end surface 205 of the body preform 20A located outside the body 2 is also covered with an outer resin reservoir R2 (see fig. 5) formed when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the both end edges of the body preform 20A overlapping each other are heat-fused. However, the outer resin reservoir R2 is not necessarily formed.
The inner resin reservoir R1 and the outer resin reservoir R2 are formed as follows: when the staggered end edges of the main body preform 20A are heat-welded to each other, a part of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the end edges overlapping each other are melted, and the melted resin is extruded in the width direction of the staggered portion 21 by the pressurizing force at the time of heat welding, thereby forming the inner resin reservoir R1 and the outer resin reservoir R2. It is considered that the inner resin reservoir R1 may be formed of a resin obtained by melting a part of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the inner end face 204 of the body blank 20A and a part of the inner heat-fusible resin layer 202 adjacent to the inner end face 204, and the outer resin reservoir R2 may be formed of a resin obtained by melting a part of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the outer end face 205 of the body blank 20A and an outer heat-fusible resin layer 203 adjacent to the outer end face 205.
These resin reservoirs R1, R2 can be formed by controlling sealing conditions (sealing temperature, pressurizing force, sealing time, sealing range, etc.) at the time of thermal welding, or by appropriately setting the configuration of the body preform 20A as described later.
In the body blank 20A, when the thickness of the metal foil layer 201 is T1, the thickness of the inner heat-fusible resin layer 202 is T2, and the thickness of the outer heat-fusible resin layer 203 is T3, T1 is preferably: t2: t3=1: 0.3 to 1.5:0.2 to 1, and T2 is more than or equal to T3. More preferably T1: t2: t3=1: 0.5 to 0.8:0.4 to 0.7. With the above-described thickness ratio configuration, the probability of forming the inner resin reservoir R1, which covers the inner end surface 204 of the body material 20A, in particular, can be improved. If T2 is greater than T3, the sealability between the lower end 2a of the main body 2 and the suspended portion 32 of the folded portion 22 and the bottom body 3 can be improved.
The melt mass flow rate, i.e., MFR, of the inner heat-fusible resin layer 202 of the body preform 20A is preferably 1 to 20g/10 minutes, more preferably 7 to 18g/10 minutes. Here, when the inner heat-fusible resin layer 202 is 2 or more layers, the MFR refers to the average value thereof. When the MFR of the inner heat-fusible resin layer 202 is set to the above range, the probability of formation of the inner resin reservoir R1 can be improved.
In the case of specifying the present invention, "MFR" means "MFR" based on JIS K7210-1:2014, and a value obtained by a standard test method of MFR specified in the specification. For example, when the inner heat-fusible resin layer 202 is formed of polypropylene, the MFR is a value measured under the conditions of a temperature of 230 ° and a load of 2.16kgf based on the above-described test method.
The MFR of the outer heat-fusible resin layer 203 of the main body preform 20A is preferably 1 to 15g/10 minutes, more preferably 4 to 10g/10 minutes. Here, when the number of the outer heat-fusible resin layers 203 is 2 or more, the MFR refers to the average value thereof. When the MFR of the outer heat-fusible resin layer 203 is set to the above range, the melted resin becomes less flowable during heat sealing, and the roughness of the surface of the sealing portion is reduced.
Fig. 4 (a) is a diagram showing a preferred embodiment in the case where the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the laminate 20 constituting the body blank 20A are each formed of 2 or more thermoplastic resin layers.
In fig. 4 (a), the inner heat-fusible resin layer 202 of the body blank 20A has a 3-layer structure formed of a sealing side thermoplastic resin layer 202a constituting the inner surface of the body 2, a lamination side thermoplastic resin layer 202b laminated on the metal foil layer 201, and an intermediate thermoplastic resin layer 202c interposed between these layers 202a, 202 b.
The MFR of the sealing side thermoplastic resin layer 202a is preferably 3 to 10g/10 min, more preferably 4 to 9g/10 min. The MFR of the laminate-side thermoplastic resin layer 202b is preferably 3 to 10g/10 min, more preferably 4 to 9g/10 min. The MFR of the intermediate thermoplastic resin layer 202c is preferably smaller than that of the sealing side thermoplastic resin layer 202a and the lamination side thermoplastic resin layer 202b, and is preferably 0.5 to 5g/10 minutes, more preferably 1.5 to 4g/10 minutes. By defining the ranges of MFR of the 3 layers 202a, 202b, 202c in the above manner, the probability of formation of the inner resin reservoir R1 can be increased, and the inner end surface 204 in particular of the body material 20A can be reliably covered and protected.
Similarly, the outer heat-fusible resin layer 203 of the body preform 20A has a 3-layer structure including a sealing side thermoplastic resin layer 203a constituting the outer surface of the body 2, a lamination side thermoplastic resin layer 203b laminated on the metal foil layer 201, and an intermediate thermoplastic resin layer 203c interposed between these layers 203a and 203 b. The MFR of each layer 203a, 203b, 203c can be set to the same range as the MFR of each corresponding layer 202a, 202b, 202c of the inner heat-fusible resin layer 202.
The inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 having the above layer configuration can be constituted by, for example, 2 kinds of 3-layer (atactic polypropylene (rPP)/block polypropylene (bPP)/atactic polypropylene (rPP)) or 1 kind of 3-layer (atactic polypropylene (rPP)/atactic polypropylene (rPP)) unstretched polypropylene films (CPP).
As shown in fig. 4 (b), the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 of the laminate 30 constituting the base material 30A may have a 3-layer structure formed of the sealing-side thermoplastic resin layers 302a and 303a, the lamination-side thermoplastic resin layers 302 b and 303b, and the intermediate thermoplastic resin layers 302c and 303c, as described above.
The body material 20A and the base material 30A may have not only the 3-layer structure described above but also a 2-layer structure formed of a sealing side thermoplastic resin layer and a lamination side thermoplastic resin layer. In this case, the MFR of the sealing side thermoplastic resin layer may be increased and the MFR of the lamination side thermoplastic resin layer may be decreased.
In the staggered portion 21 of the main body 2 of the cup-shaped container 1, the total thickness T4 of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203, which are heat-fused to each other at both end edges of the main body preform 20A, is preferably 8 to 150 μm, and more preferably 16 to 80 μm (see fig. 5). If the total thickness T4 is less than 8 μm, the sealability of the staggered portions 21 may be insufficient. On the other hand, if the total thickness T4 exceeds 150 μm, the barrier properties of the staggered portions 21 may be impaired.
In the staggered portion 21 of the main body 2, the overlapping width W1 of the metal foil layers 201, 201 at both end edges of the main body blank 20A is preferably 2 to 10mm, more preferably 4 to 8mm, as viewed in the thickness direction (see fig. 5). If the overlap width W1 is less than 2mm, barrier properties of the staggered portions 21 may be impaired, and sealing width may be too small to provide sufficient sealing properties. On the other hand, if the overlapping width W1 exceeds 10mm, the width of the staggered portion 21 becomes excessively large, which leads to an increase in cost, and further, there is a possibility that appearance defects such as wrinkles may occur in the inner portion of the staggered portion 21 due to a difference in stress applied to the inner portion (one end edge portion of the body blank 20A) and the outer portion (the other end edge portion of the body blank 20A) of the staggered portion 21.
Fig. 6 to 8 each show another embodiment of the staggered portion 21 of the body 2 in the cup-shaped container 1.
In the case of the staggered portion 21 of the main body 2 shown in fig. 6, the inner end surface 204X of the main body preform 20A is formed as an inclined surface facing the outside of the main body 2.
Compared with the embodiment shown in fig. 5, the angle formed by the inner end surface 204X formed by the inclined surface and the inner surface of the portion of the body blank 20A adjacent to the outer end edge portion of the body 2, which is the outer side of the body, is small and is an acute angle. Therefore, the gaps between these surfaces are easily filled with the inner resin reservoir R1, and the inner end surface 204X can be covered with the inner resin reservoir R1 more reliably.
The inner end surface 204X formed by such an inclined surface can be formed, for example, as follows: the laminate 20 is cut from the outer heat-fusible resin layer 203 side toward the inner heat-fusible resin layer 202 side to form a body blank 20A.
In addition, although not shown, the outer end surface 205 of the body material 20A may be formed as an inclined surface facing the inside of the body 2 in addition to the above-described configuration. This can more reliably cover the outer end surface 205 with the outer resin reservoir R2.
In the staggered portion 21 of the main body 2 shown in fig. 7, a stepped portion 206 bent in a crank shape so as to face the inner end surface 204 of the main body material 20A is formed in a portion of the main body material 20A adjacent to an outer end edge portion which is the outer side of the main body 2, out of both end edge portions of the staggered portion. An inner resin reservoir R1 is formed between the stepped portion 206 and the inner end surface 204.
In this case, the angle formed between the inner end surface 204X of the body material 20A and the inner surface of the stepped portion 206 is smaller than the embodiment shown in fig. 5 and is an acute angle. Therefore, the gaps between these surfaces are easily filled with the inner resin reservoir R1, and the inner end surface 204X can be covered with the inner resin reservoir R1 more reliably.
The stepped portion 206 is formed by deforming a desired portion of the body material 20A by a pressing force generated by a hot plate or the like, for example, when the both end edges of the body material 20A are staggered and heat-welded.
In the case of the staggered portion 21 of the main body 2 shown in fig. 8, the inner end surface 204X of the main body material 20A is formed as an inclined surface facing the outside of the main body 2. Further, a stepped portion 206 bent in a crank shape is formed in a portion of the body material 20A adjacent to an outer edge portion which is an outer side of the body 2, of the staggered end edges, so as to face the inner end surface 204X of the body material 20A. An inner resin reservoir R1 is formed between the stepped portion 206 and the inner end surface 204X formed of the inclined surface.
In the case of the above-described embodiment, the gap between the inner end surface 204X of the body preform 20A and the inner surface of the stepped portion 206 is narrower than the embodiment shown in fig. 6 and 7, so that the filling with the inner resin pool R1 is facilitated, and the coating of the inner end surface 204X with the inner resin pool R1 can be performed more reliably.
According to the cup-shaped container 1 of embodiment 1, the following effects are obtained.
a) The body material 20A and the base material 30A are formed of the laminate 20, 30, respectively, and the laminate 20, 30 includes the metal foil layers 201, 301 and the heat-fusible resin layers 202, 203, 302, 303 laminated on both surfaces thereof, so that the paper cup can be manufactured at low cost using manufacturing equipment.
b) The laminate 20, 30, which is the material of each of the blanks 20A, 30A, has the metal foil layers 201, 301, and therefore the long-term storage property of the content is excellent.
c) Since the thickness of the body material 20A is smaller than that of the paper cup, the level difference of the portion including the staggered portions 21 on the upper surface of the flange portion 23 of the body 2 can be reduced, and thus, sealing failure is less likely to occur when the lid is sealed on the upper surface of the flange portion 23 of the container 1. In addition, in the case of aseptic filling, the sterilizing liquid is less likely to remain on the upper surface of the flange portion 23 at the level difference.
d) The base body 3 is formed by drawing the base body blank 30A, and therefore, the base body 3 does not wrinkle, and therefore, poor joining between the hanging portion 32 of the base body 3 and the lower end portion 2a and the folded portion 22 of the main body 2 or a decrease in barrier properties does not occur as in the conventional paper cup.
e) The thicknesses of the body material 20A and the base material 30A are smaller than those of the paper cup, and therefore the lower end portion 2a of the body 2 and the folded portion 22 can be stably joined to the hanging portion 32 of the base 3.
f) Since the radius of curvature R, which is the corner between the bottom 31 and the hanging portion 32, of the outer surface of the base 3 can be made smaller than that of a paper cup, sterilizing liquid is less likely to remain on the boundary between the upper surface of the base 3 of the cup-shaped container 1 and the inner peripheral surface of the main body 2 when aseptic (aseptic) filling is performed.
g) The stacked bodies 20, 30, which are the materials of the respective blanks 20A, 30A, have no paper layer, and thus can be subjected to retort sterilization without any trouble.
h) In the staggered portion 21 of the main body 2, the inner end surfaces 204, 204X of the main body preform 20A located inside the main body 2 are covered with the inner resin reservoir R1 formed when the heat-fusible resin layers 202, 203 at both end edges of the main body preform 2 are heat-fused to each other, and are not exposed to the content, so that deterioration due to delamination and corrosion of the inner end surfaces 204, 204X can be effectively suppressed, and the present invention is also desirable in terms of hygiene.
i) In the staggered portion 21 of the main body 2, the outer end surface 205 of the main body preform 20A located outside the main body 2 is covered with the outer resin reservoir R2 formed when the heat-fusible resin layers 202 and 203 at both end edges of the main body preform 2 are heat-fused to each other, so that deterioration due to delamination and corrosion of the outer end surface 205 can be effectively suppressed.
< embodiment 2 >
Fig. 13 to 16 are views showing a cup-shaped container according to embodiment 2 of the present invention. The cup-shaped container of this embodiment is substantially the same as the cup-shaped container 1 of embodiment 1 shown in fig. 1 to 12, except for the following points.
In the cup-shaped container 1 of the present embodiment, first, the body blank 20A has the following features. That is, at least one (preferably both) of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body blank 20A includes 2 or more layers.
As shown in fig. 13 (a), when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body blank 20A are each of a 2-layer structure, the heat-fusible resins constituting the laminate-side heat-fusible resin layers 202b and 203b laminated on the metal foil layer 201 have a lower melting point than the heat-fusible resins constituting the seal-side heat- fusible resin layers 202a and 203a (which constitute the inner surface or the outer surface of the body 2) in the respective layers 202 and 203.
As shown in fig. 14 (a), when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body blank 20A are each of a 3-layer structure, the heat-fusible resins constituting the laminate-side heat-fusible resin layers 202b and 203b laminated on the metal foil layer 201 have a lower melting point than the heat-fusible resins constituting the seal-side heat- fusible resin layers 202a and 203a (which constitute the inner surface or the outer surface of the body 2) and the heat-fusible resins constituting the intermediate heat-fusible resin layers 202c and 203c (which are interposed between the laminate-side heat-fusible resin layers 202b and 203b and the seal-side heat- fusible resin layers 202a and 203 a) in the respective layers 202 and 203.
Similarly, as shown in fig. 13 (b), the base material 30A may have a 2-layer structure of both the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303, and the heat-fusible resins constituting the laminate-side heat-fusible resin layers 302b and 303b laminated on the metal foil layer 301 in the respective layers 302 and 303 may have a lower melting point than the heat-fusible resins constituting the seal-side heat- fusible resin layers 302a and 303a located on the front surface side of the base 3. Alternatively, as shown in fig. 14 (b), the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 may each have a 3-layer structure, and the heat-fusible resins constituting the laminate-side heat-fusible resin layers 302b and 303b laminated on the metal foil layer 301 in each of the layers 302 and 303 may have a lower melting point than the heat-fusible resins constituting the seal-side heat- fusible resin layers 302a and 303a positioned on the front surface side of the base 3 and the heat-fusible resins constituting the intermediate heat-fusible resin layers 302c and 303c (which are interposed between the laminate-side heat-fusible resin layers 302b and 303b and the seal-side heat- fusible resin layers 302a and 303 a).
The melting point of the heat-fusible resin constituting the laminate-side heat- fusible resin layers 202b, 203b, 302b, 303b is preferably 10 ℃ or more, more preferably 20 ℃ or more, lower than the melting point of the heat-fusible resin constituting the seal-side heat- fusible resin layers 202a, 203a, 302a, 303a (and the intermediate heat- fusible resin layers 202c, 203c, 302c, 303 c). The difference in melting points specified here is the difference between the melting point of the heat-fusible resin constituting the lamination-side heat-fusible resin layer and the lowest melting point among the melting points of the heat-fusible resins constituting the other 2 or more heat-fusible resin layers in the heat-fusible resin layers formed of 3 or more layers.
More specifically, the melting point of the heat-fusible resin constituting the laminate-side heat- fusible resin layers 202b, 203b, 302b, 303b is preferably 110 to 140 ℃, and more preferably 120 to 135 ℃.
In the case where the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body material 20A and the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 of the base material 30A are of a 2-layer structure, the heat-fusible resins constituting the sealing side heat- fusible resin layers 202a, 203a, 302a, 303a preferably have a melting point of 150 to 165 ℃, more preferably 155 to 160 ℃.
In the case where the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body material 20A and the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 of the base material 30A are 3-layer structures, the melting point of the heat-fusible resin constituting the sealing side heat- fusible resin layers 202a, 203a, 302a, 303a is preferably 110 to 140 ℃, more preferably 120 to 135 ℃, and the melting point of the heat-fusible resin constituting the intermediate heat- fusible resin layers 202c, 203c, 302c, 303c is preferably 150 to 165 ℃, more preferably 155 to 160 ℃.
In addition to the above difference in melting point, the melt mass flow rate or MFR of the heat-fusible resin constituting the laminate-side heat- fusible resin layers 202b, 203b, 302b, 303b is preferably greater than the melt mass flow rate or MFR of the heat-fusible resin constituting the seal-side heat- fusible resin layers 202a, 203a, 302a, 303a (and the intermediate heat- fusible resin layers 202c, 203c, 302c, 303 c), more preferably greater than 1 to 5g/10 minutes, and still more preferably greater than 2 to 4g/10 minutes. The difference in the melt mass flow rate, that is, the MFR, defined here for the heat-fusible resin layers formed of 3 or more layers is the difference between the MFR of the heat-fusible resin constituting the lamination-side heat-fusible resin layer and the MFR of the largest value among the MFRs of the heat-fusible resins constituting the other 2 or more heat-fusible resin layers.
The MFR, which is the melt mass flow rate, is a value obtained by a standard test method based on the MFR specified in JIS K7210-1-2014. For example, when each heat-fusible resin layer is formed of polypropylene, the MFR thereof is a value measured under a condition of a temperature of 230 ℃ and a load of 2.16kgf based on the above-described test method.
More specifically, the MFR of the heat-fusible resin constituting the laminate-side heat- fusible resin layers 202b, 203b, 302b, 303b is preferably 4 to 10g/10 minutes, and more preferably 5 to 8g/10 minutes.
In the case where the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body material 20A and the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 of the base material 30A are of a 2-layer structure, the MFR of the heat-fusible resin constituting the sealing side heat- fusible resin layers 202a, 203a, 302a, 303a is preferably 4 to 10g/10 minutes, more preferably 5 to 8g/10 minutes.
When the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body material 20A and the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 of the base material 30A are 3-layer structures, the MFR of the heat-fusible resin constituting the sealing side heat- fusible resin layers 202a, 203a, 302a, 303a is preferably 4 to 10g/10 minutes, more preferably 5 to 8g/10 minutes, and the MFR of the heat-fusible resin constituting the intermediate heat- fusible resin layers 202c, 203c, 302c, 303c is preferably 2 to 5g/10 minutes, more preferably 3 to 4g/10 minutes.
In the cup-shaped container 1 of embodiment 2, the staggered portion 21 of the body 2 has the following features.
That is, as shown in fig. 15, the metal foil layer 201 portion of the inner end surface 204 of the body blank 20A located inside the body 2 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are covered with a protective film M1, and the protective film M1 is formed by melting and solidifying the heat-fusible resin constituting the laminate-side heat-fusible resin layers 202b and 203b when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the both end edges of the body blank 20A overlapped with each other are heat-welded.
In the case of the staggered portion 21 of the main body 2 of the embodiment shown in fig. 16, the metal foil layer 201 portion of the outer end surface 205 of the main body material 20A located outside the main body 2 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are further covered with a protective film M2, which is formed by the heat-fusible resin that forms the lamination-side heat-fusible resin layers 202b and 203b when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 that form the surfaces of the two end edges of the main body material 20A that overlap each other are heat-welded together, in addition to the covering of the inner end surface 204 with the protective film M1.
According to the cup-shaped container 1 of embodiment 2, the following effects can be exhibited.
j) In the staggered portion 21 of the main body 2, the metal foil layer 201 portion of the inner end surface 204 of the main body blank 20A located inside the main body 2 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are covered with the protective film M1 (which is formed by melting and solidifying the heat-fusible resin of the low melting point constituting the laminated side heat-fusible resin layers 202b and 203b of the heat-fusible resin layers 202 and 203 of the multilayer structure in the main body blank 20A at the time of heat welding), and are not exposed to the content, and therefore, deterioration due to delamination and corrosion of the inner end surface 204 can be effectively suppressed, and further, it is desirable in terms of hygiene.
k) In the staggered portion 21 of the main body 2, the metal foil layer 201 portion of the outer end surface 205 of the main body blank 20A located outside the main body 2 and the interface portion protection film M2 between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 (which is formed by melting and solidifying the heat-fusible resin of the low melting point constituting the lamination-side heat-fusible resin layers 202b and 203b in the heat-fusible resin layers 202 and 203 in the multilayer structure in the main body blank 20A at the time of heat welding) are coated, so deterioration due to delamination and corrosion of the outer end surface 205 can be effectively suppressed for a long period of time.
Although not shown, the metal foil layer 301 and the interface between the metal foil layer 301 and the heat-fusible resin layers 302 and 303 may be covered with a protective film formed by melting and solidifying the heat-fusible resin layers 302, 303, and 202 constituting the laminate-side heat- fusible resin layers 302b, 303b, and 202b when the heat-fusible resin layers 302, 303, and 202 constituting the surfaces of the lower end portion 32 of the base 3 and the overlapping surface of the lower end portion 2a of the main body 2 and the folded-back portion 22 are heat-welded to each other at the end surface of the base material 30A, that is, the lower end surface of the lower end portion 32 of the base body 3. This can effectively suppress degradation due to delamination and corrosion of the lower end surface of the hanging portion 32 of the base 3.
Further, the upper and lower edge surfaces of the body preform 20A, that is, the front end surface of the flange portion 23 of the body 2 and the front end surface of the folded portion 22 of the body 2 (the lower end surface of the body 2 in the case where the folded portion 22 is not provided in the body 2) are also covered with the protective film formed by, for example, melt-curing the low-melting-point heat-fusible resin constituting the laminated-side heat- fusible resin layers 202b, 203b, 302b, 303b of the multilayer structures when the cover is heat-welded to the flange portion 23 of the body 2 and when the lower end portion 2a of the body 2 and the folded portion 22 of the body 2 are heat-welded to the hanging portion 32 of the base 3, in the same manner as described above, whereby deterioration due to delamination and corrosion of the respective top end surfaces can be effectively suppressed.
In the cup-shaped container according to embodiment 2, the body may be formed by overlapping and joining both end edges of the body material. In this embodiment as well, as in the above embodiment, the metal foil layer portion of at least one of the 2 end faces of the body blank and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with the protective film formed by melt-curing the heat-fusible resin of the low melting point constituting the laminate-side heat-fusible resin layer in the inner heat-fusible resin layers of the multilayer structure of the two end edges of the body blank when the heat-fusible resin layers are heat-welded to each other, whereby deterioration due to delamination and corrosion of the end faces can be effectively suppressed.
A method for manufacturing cup-shaped container 1 according to embodiment 3 will be described below with reference to fig. 2, 9 to 12, and the like.
The manufacturing method includes the following steps 1 to 6. The order of the steps may be changed as appropriate.
(step 1)
The 1 st step is a step of punching out a laminate 20 including a metal foil layer 201 and an inner heat-fusible resin layer 202 and an outer heat-fusible resin layer 203 laminated on both sides of the metal foil layer 201 into a fan shape of a predetermined size to form a body blank 20A (see fig. 9 (a)).
(step 2)
The step 2 is a step of punching out a laminate 30 including a metal foil layer 301 and an upper heat-fusible resin layer 302 and a lower heat-fusible resin layer 303 laminated on both sides of the metal foil layer 301 into a circular shape having a predetermined size to form a base material 30A (see fig. 10 (a)).
(step 3)
The 3 rd step is a step of drawing the base material 30A using a die (not shown) to form the base 3 having a substantially inverted U-shaped cross section formed by the bottom 31 and the hanging portion 32 (see fig. 10 b).
No wrinkles are generated on the manufactured base body 3. In addition, the corner portion between the bottom 31 and the hanging portion 32 in the outer surface of the bottom body 3 forms an angle.
(step 4)
The 4 th step is a step of forming the tubular body 2 by interlacing both end edges of the body material 20A and heat-welding the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the both end edges overlapping each other (see fig. 9 (b) and the like).
This process is generally performed as follows: the base body 3 is previously set so that the upper surface of the bottom 31 overlaps the top surface of a substantially conical trapezoidal mold (not shown), and then the main body preform 20A is wound around the outer peripheral surface of the mold, and after the both end edges thereof are staggered, the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the overlapping surfaces of the both end edges are heat-fused.
In step 4, the heat welding of both end edges of the main body preform 20A is performed 2 times in total. The 1 st heat sealing is usually performed by heat sealing using a hot plate or the like, and may be performed by high-frequency sealing, ultrasonic sealing, or the like. And, the 2 nd heat fusion is performed by high-frequency sealing. The above-described 2-stage heat welding can more reliably join the both end edges of the main body preform 20A to each other, and the resin pool is easily formed at the corresponding joining portion due to the heat welding, thereby further suppressing the occurrence of deformation and the like due to the heat welding.
Here, for example, when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 are formed of an unstretched polypropylene film (CPP), it is preferable that the sealing temperature be set at: 160-220 ℃, load (sealing pressure): 80-200 kgf and sealing time: heat sealing is carried out under the condition of 1 to 5 seconds. In the case where the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 are formed of a polyethylene film (PE), it is preferable that the sealing temperature be set at: 140-220 ℃ and the load: 80-200 kgf and sealing time: under the condition of 1 to 5 seconds. That is, in the case of heat sealing, it is preferable that the heat sealing is performed from both sides of both end edges of the staggered body material 20A while heating at a temperature 20 to 40 ℃ higher than the melting point of the resin constituting the heat-fusible resin layers 202 and 203.
In addition, it is preferable to output, for example: 0.5-1.5 kW, sealing time: 3-5 seconds, distance from coil: 0.5-15 mm and load: high-frequency sealing is performed under the condition of 100-200 kgf.
(step 5)
The 5 th step is as follows: the body 2 is folded back inward from the lower end opening edge portion thereof so as to enclose the hanging portion 32 of the base 3 to form the folded portion 22, and the body 2 and the base 3 are integrated by heat-welding the inner heat-fusible resin layer 202, the upper heat-fusible resin layer 302, and the lower heat-fusible resin layer 303, which constitute the surfaces of the lower end portion 2a of the body 2 and the folded portion 22 overlapping the hanging portion 32 of the base 3 (see fig. 2 and 11).
In this step, the lower end opening edge portion of the main body 2 is folded back inward, the folded back portion 22 is pressed against the hanging portion 32 of the base 3 by a disk-shaped rotary mold (not shown), and then the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 of the inner heat-fusible resin layer 202 constituting the surfaces where the lower end portion 2a of the main body 2 and the folded back portion 22 overlap with the hanging portion 32 of the base 3 are heat-fused.
In step 5, the heat-fusible resin layers 202, 302, and 303 of the lower end portion 2a of the main body 2, the folded portion 22, and the hanging portion 32 of the base 3 are heat-fused together 2 times. The 1 st heat sealing is usually performed by heat sealing using a hot plate or the like, and may be performed by high-frequency sealing, ultrasonic sealing, or the like. The 2 nd heat fusion is performed by high-frequency sealing. In the case of high-frequency sealing, the metal foil layer is heated to a high temperature by induction heating, and heat generated from the metal foil layer is used to promote thermal welding of the heat-fusible resin layers to each other. By the above-mentioned 2-stage heat welding, the lower end portion 2a of the main body 2 and the folded portion 22 are more reliably joined to the hanging portion 32 of the bottom body 3, and resin pools are easily formed at the corresponding joining portions with the heat welding, thereby further suppressing occurrence of deformation or the like with the heat welding. The preferable conditions for heat sealing and high-frequency sealing are the same as in the case of step 4.
In the case of manufacturing a container in which the folded portion 22 is not formed at the lower end opening edge portion of the main body 2 and the outer surface of the hanging portion 32 of the bottom body 3 is joined to the inner surface of the lower end portion 2a of the main body 2 as shown in fig. 12, the main body 2 and the bottom body 3 may be integrated by substantially the same process as the 5 th process, that is, in the following manner: the inner surface of the lower end portion 2a of the main body 2 is overlapped with the outer surface of the hanging portion 32 of the base body 3, the inner heat-fusible resin layer 202 and the upper heat-fusible resin layer 302 constituting these surfaces are heat-fused 2 times, and the heat-fused 2 nd times are heat-fused by high-frequency sealing.
(step 6)
The 6 th step is a step of forming the flange portion 23 by crimping the upper end opening edge portion of the main body 2 to the outside using a predetermined crimping die (not shown) and pressing the crimped portion in the up-down direction to be flat (see fig. 11).
Depending on the shape of the flange, the flange may be formed by a different means or process from the above.
According to the method for manufacturing the cup-shaped container 1 of embodiment 3, the following effects can be exhibited.
l) in the 4 th step of forming the tubular body 2, the heat-sealable resin layers at both end edges of the body material are heat-sealed 2 times, and the 2 nd heat-sealing is performed so as to be able to heat the metal foil layers, so that both end edges of the body material 20A can be joined to each other more reliably, and resin pools are easily formed at the corresponding joint portions due to the heat-sealing, and thus the sealability of the container 1 can be improved. Further, occurrence of defects in appearance such as deformation of the container 1 can be effectively suppressed.
m) in the 5 th step of integrating the main body with the base, the heat-fusible resin layers 202, 302, 303 of the lower end portion 2a of the main body 2 and the folded-back portion 22 and the hanging portion 32 of the base 3 are heat-fused together 2 times, and the 2 nd heat-fusion is heat-fused by high-frequency sealing, so that the lower end portion 2a of the main body 2 and the folded-back portion 22 can be joined to the hanging portion 32 of the base 3 more reliably, and resin is easily accumulated in the corresponding joint portion due to the heat-fusion, and the sealability of the container 1 can be improved. Further, occurrence of defects in appearance such as deformation of the container 1 can be effectively suppressed.
Embodiment 4
Fig. 17 and 18 are diagrams showing a cup-shaped container 1X and a method for manufacturing the same according to embodiment 4 of the present invention.
The present embodiment is substantially the same as the cup-shaped container 1 of embodiment 1 or 2 and the method of manufacturing the cup-shaped container of embodiment 3 shown in fig. 1 to 16 except for the following points.
That is, as shown in fig. 17 and 18, in the cup-shaped container 1X of the present embodiment, the end edge 204, which is the inner side of the body 2, of the both end edge portions of the body blank 20A is folded back so as to overlap the surface of the body blank 20A, which is the outer side of the body 2, and is heat-welded to the surface, and the folded-back end edge 204 and the other end edge 205 are staggered, and the inner heat-fusible resin layers 202 constituting the surfaces of the folded-back end edge 204 and the folded-back end edge 205 are heat-welded to each other.
According to the cup-shaped container 1X, since both end surfaces of the body preform 20A do not contact the content stored in the container 1X at the staggered portion 21 of the body 2, occurrence of delamination, corrosion, and the like can be suppressed, and since the surface contacting the content can be made of 1 resin, sterilization is easy, and the cup-shaped container is also advantageous in terms of sanitation.
The folded width of the folded edge portion 204 is substantially the same as the staggered width of the edge portions 204 and 205 as shown in the figure, but may be different from each other.
Further, although not shown, at least the metal foil layer 201 portion of the two end surfaces of the body blank 20A located on the outer side of the body 2 may be covered with an outer resin reservoir or a protective film formed when the inner heat-fusible resin layers 202 constituting the mutually overlapping surfaces of the two end edges of the body blank 20A are heat-fused to each other, as in embodiment 1 or 2, whereby deterioration due to delamination or corrosion of the end surfaces can be effectively suppressed over a long period of time.
In manufacturing the cup container 1X, the 4 th step of forming the main body 2 is performed in the following manner.
That is, the end edge 204 of the body material 20A, which is the inner side of the body 2, is folded back so as to overlap the surface of the body material 20A, which is the outer side of the body 2, and the folded back end edge 204 and the other end edge 205 are staggered, and the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203, which constitute the surfaces of the overlapped surfaces 204, 205, are heat-fused together 2 times.
The 1 st heat sealing is usually performed by heat sealing using a hot plate or the like, and may be performed by high-frequency sealing, ultrasonic sealing, or the like. And, the 2 nd heat fusion is performed by high-frequency sealing. By the above-described 2-stage heat welding, both end edge portions of the main body preform 20A can be joined to each other more reliably, and resin pools can be easily formed at the corresponding joining portions with the heat welding, thereby further suppressing occurrence of deformation or the like with the heat welding.
Embodiment 5
Fig. 19 and 20 are diagrams showing a cup-shaped container 1Y and a method for manufacturing the same according to embodiment 5 of the present invention.
The present embodiment is substantially the same as the cup-shaped container 1 of embodiment 1 or 2 and the method of manufacturing the cup-shaped container of embodiment 3 shown in fig. 1 to 16 except for the following points.
That is, as shown in fig. 19 and 20, in the cup-shaped container 1Y of the present embodiment, the body 2 is formed into a tubular shape by overlapping and bonding both end edges of the body blank 20A in a palm-like shape (see fig. 20 (a)). More specifically, the two overlapping palm-shaped end edges of the body material 20A are joined by heat welding the inner heat-fusible resin layers 202 to each other.
The palm portion 21Y of the main body 2 is folded to one side so as to be staggered with the outer surface of the main body 2, and is heat-welded to the outer surface (see fig. 20 (b)).
The width (overlapping amount) of the palm-engaging portion 21Y of the main body 2 is preferably 5 to 20mm, more preferably 10 to 18mm. If the width is less than 5mm, the sealing operation of the palm portion 21Y may be difficult. On the other hand, if the width exceeds 20mm, the width of the half-sole portion 21Y becomes excessively large, which increases the cost, and when the half-sole portion 21Y is folded to one side so as to overlap the outer surface of the main body 2 and is joined to the outer surface, there is a possibility that appearance defects such as wrinkles may occur in the half-sole portion 21Y.
According to the cup-shaped container 1Y, the both end surfaces of the body blank 20A do not come into contact with the content stored in the container 1X at the palm-joining portion 21Y of the body 2, and therefore occurrence of delamination, corrosion, and the like can be suppressed. Further, according to this container 1Y, the surface to be in contact with the content can be made of 1 resin, so that sterilization becomes easy, and it is also advantageous in terms of hygiene.
In addition, according to the cup-shaped container 1Y, the palm-engaging portion 21Y of the main body 2 is folded to one side and thermally welded to the outer surface of the main body 2, so that the sealing property and barrier property of the portion are improved. Further, according to the cup-shaped container 1Y, the palm-engaging portion 21Y does not protrude outward, so that the appearance is improved and the holding is easy.
Although not shown, as in embodiment 1 or 2, at least the metal foil layer 201 portion of the two end faces of the main body blank 20A located outside the main body 2 may be covered with an outer resin reservoir or a protective film formed when the inner heat-fusible resin layers 202 constituting the mutually overlapping faces of the two end edges of the main body blank 20A are heat-fused to each other, whereby deterioration due to delamination or corrosion of the end faces can be effectively suppressed over a long period of time.
In manufacturing the cup container 1Y, the 4 th step of forming the main body 2 is performed as follows.
That is, the two end edges of the body material 20A are overlapped in a palm-like shape, and the inner heat-fusible resin layers 202 constituting the overlapped surfaces are bonded to each other by performing the 1 st heat fusion, thereby forming the cylindrical body 2 having the palm-like portion 21Y. The 1 st heat sealing is usually performed by heat sealing using a hot plate or the like, and may be performed by high-frequency sealing, ultrasonic sealing, or the like.
Next, the palm portion 12Y is folded to one side and overlapped with the outer surface of the main body 2, and in this state, the 2 nd heat fusion is performed by high-frequency sealing. Accordingly, the inner heat-fusible resin layers 202 constituting the overlapping surfaces of the both end edges of the body blank 20A can be further heat-fused to each other, and the inner side surface constituting the folded palm portion 21Y and the outer heat-fusible resin layer 203 constituting the outer surface of the body 2 overlapping therewith can be heat-fused to each other, so that the palm portion 21Y and the outer surface of the body 2 are joined.
The above-described 2-stage heat welding can more reliably join the both end edges of the main body preform 20A to each other, and the resin pool is easily formed at the corresponding joining portion due to the heat welding, so that the occurrence of deformation and the like due to the heat welding can be further suppressed.
< embodiment 6 >
Fig. 21 and 22 are diagrams showing a cup-shaped container 1 according to embodiment 6 of the present invention.
In the cup-shaped container 1 of the present embodiment, a structure having the following features is used as the main body material 20A. That is, at least one (preferably both) of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body blank 20A contains a modified polyolefin.
More specifically, as shown in fig. 3 (a), when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body material 20A are each a single layer, each of the layers 202 and 203 is formed of a modified polyolefin. As shown in fig. 13 (a) and 14 (a), when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 of the body blank 20A are 2 or 3 or more layers, the sealing-side heat- fusible resin layers 202a and 203a constituting the inner or outer surface of the body 2 are formed of non-modified heat-fusible resin, and the lamination-side heat-fusible resin layers 202b and 203b laminated on the metal foil layer 201 are formed of modified polyolefin.
In addition, in the same manner as in the case of the body material 20A, the base material 30A may be formed of a single layer of each of the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 (see fig. 3 b), and in the case where each of the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 is 2 or 3 or more layers, each of the sealing heat- fusible resin layers 302a and 303a constituting the inner surface or the outer surface of the suspended portion 32 of the base 3 is formed of a non-modified heat-fusible resin, and each of the lamination heat-fusible resin layers 302b and 303b laminated on the metal foil layer 301 is formed of a modified polyolefin (see fig. 13 b) and 14 b).
Examples of the modified polyolefin include carboxylic acids such as maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, aconitic acid, crotonic acid, succinic acid, oxalic acid, malonic acid, malic acid, thiomarin acid, tartaric acid, adipic acid, citric acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid, and polyolefins modified with carboxylic anhydrides such as maleic anhydride, itaconic anhydride, citraconic anhydride, and succinic anhydride (polypropylene (PP), polyethylene (PE), and copolymers thereof). Maleic acid-modified polyolefin and maleic anhydride-modified polyolefin are preferably used. The single-layer heat-fusible resin layers 202, 203, 302, 303 and the multilayer heat- fusible resin layers 202b, 203b, 302b, 303b of the multilayer heat-fusible resin layers 202, 203, 302, 303 are formed using films or coatings made of these modified polyolefins.
As the non-modified heat-fusible resin constituting the sealing side heat- fusible resin layers 202a, 203a, 302a, 303a, for example, a general-purpose film such as a polypropylene (PP) film or a Polyethylene (PE) film having heat-fusible properties, or a composite film obtained by bonding these films is used. Preferably, an unstretched polypropylene film (CPP) is used.
The heat-fusible resin layers 202, 203, 302, 303 may include layers other than those described above, specifically, for example, a general-purpose film (preferably, an unstretched polypropylene film (CPP)) such as a polypropylene (PP) film or a Polyethylene (PE) film having heat-fusible properties, a composite film obtained by bonding these films, or a layer formed of a coating layer such as maleic acid-modified polyethylene, maleic acid-modified polypropylene, ethylene-vinyl acetate, an epoxy resin, or a shellac resin.
In addition, the cup-shaped container 1 according to embodiment 6 has the following features in terms of structure at the staggered portion 21 of the main body 2.
That is, as shown in fig. 21, the metal foil layer 201 portion of the inner end surface 204 of the body blank 20A located inside the body 2 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are covered with a protective film M1, and the protective film M1 is formed by melt-curing a modified polyolefin when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the both end edges of the body blank 20A overlapping each other are heat-welded.
In the case of the staggered portion 21 of the main body 2 of the embodiment shown in fig. 22, the metal foil layer 201 portion of the outer end surface 205 of the main body preform 20A located outside the main body 2 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are covered with the protective film M2 in addition to the covering of the inner end surface 204 with the protective film M1, which is formed by melt-curing the modified polyolefin when the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the surfaces of the both end edges of the main body preform 20A overlapping each other are heat-welded.
Further, in the staggered portion 21 of the main body 2 shown in fig. 22, a stepped portion 206 bent in a crank shape so as to face the inner end surface 204 of the main body material 20A is formed at a portion adjacent to the outer end edge portion which is the outer side of the main body 2, of the staggered both end edge portions of the main body material 20A. The stepped portion 206 is formed by deforming a desired portion of the body material 20A by a pressing force generated by a hot plate or the like, for example, when the both end edges of the body material 20A are staggered and heat-welded.
At the staggered portion 21 of the main body 2 of the cup-shaped container 1, the total thickness T1 of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203, which are heat-fused to each other at both end edges of the main body preform 20A, is preferably 8 to 150 μm, and more preferably 16 to 80 μm (see fig. 21). If the total thickness T1 is less than 8 μm, the sealability of the staggered portions 21 may be insufficient. On the other hand, if the total thickness T1 exceeds 150 μm, the barrier properties of the staggered portions 21 may be impaired.
In addition, at the staggered portion 21 of the main body 2, the overlapping width W1 of the metal foil layers 201, 201 at both end edges of the main body blank 20A as viewed in the thickness direction is preferably 2 to 10mm, more preferably 4 to 8mm. If the overlap width W1 is less than 2mm, barrier properties of the staggered portions 21 may be impaired, and sealing widths may be too small to provide adequate sealing properties. On the other hand, if the overlapping width W1 exceeds 10mm, the width of the staggered portion 21 becomes excessively large, which leads to an increase in cost, and further, there is a possibility that a difference in stress applied to the inner portion (one end edge portion of the body material 20A) and the outer portion (the other end edge portion of the body material 20A) of the staggered portion 21 causes appearance defects such as wrinkles in the inner portion of the staggered portion 21.
According to the cup-shaped container 1 of embodiment 6, the following effects can be exhibited.
n) the portion of the metal foil layer 201 located on the inner end surface 204 of the body material 20A on the inner side of the body 2 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are covered with the protective film M1 formed by melt-curing the modified polyolefin contained in the heat-fusible resin layers 202 and 203 of the body material 20A at the time of heat-welding, without exposure to the content, and therefore deterioration due to delamination and corrosion of the inner end surface 204 can be effectively suppressed, and it is also desirable in terms of hygiene. In particular, since the protective film M1 is formed of a modified polyolefin having excellent adhesive strength with the metal foil layer 202, it is considered that the above effect can be sustained for a long period of time.
o) the portion of the metal foil layer 201 and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 of the outer end surface 205 of the body blank 20A located outside the body 2 are covered with the protective film M2 formed by melt-curing the modified polyolefin contained in the heat-fusible resin layers 202 and 203 of the body blank 20A at the time of heat-welding at the staggered portion 21 of the body 2, and therefore deterioration due to delamination and corrosion of the outer end surface 205 can be effectively suppressed for a long period of time.
Although not shown, the metal foil layer 301 and the interface between the metal foil layer 301 and the heat-fusible resin layers 302 and 303 may be covered with a protective film formed by melt-curing the modified polyolefin contained in at least one of the heat-fusible resin layers 302, 303 and 202 when the heat-fusible resin layers 302, 303 and 202 constituting the overlapping surfaces of the lower end portion 32 of the base 3 and the lower end portion 2a of the main body 2 and the folded portion 22 are heat-welded to each other at the end face of the base material 30A, that is, the lower end face of the lower end portion 32 of the base 3. This can effectively suppress degradation due to delamination and corrosion of the lower end surface of the hanging portion 32 of the base 3.
Further, the upper and lower edge surfaces of the body preform 20A, that is, the front end surface of the flange portion 23 of the body 2 and the front end surface of the folded portion 22 of the body 2 (the lower end surface of the body 2 in the case where the body 2 does not have the folded portion 22) may be covered with a protective film formed by, for example, melt-curing the modified polyolefin contained in the heat-fusible resin layers 202, 203, 302, 303 of the lower end portion 2a of the body 2 and the folded portion 22 and the hanging portion 32 of the base 3 when the lid is heat-welded to the flange portion 23 of the body 2, as well as the above, in the same manner, whereby deterioration due to delamination and corrosion of the respective top end surfaces can be effectively suppressed.
In the cup-shaped container of the present embodiment, the body may be formed by overlapping and joining both end edges of the body material (see fig. 19 and 20). In this embodiment, as in the above-described embodiment, it is also preferable that the metal foil layer portion of at least one of the 2 end faces of the body blank and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with a protective film formed by melt-curing a modified polyolefin contained in the inner heat-fusible resin layers of both end edge portions of the body blank when the layers are heat-fused to each other, whereby deterioration due to delamination and corrosion of the end faces can be effectively suppressed.
Embodiment 7
Fig. 23 to 25 are views showing a cup-shaped container 1 according to embodiment 7 of the present invention.
The cup-shaped container 1 of the present embodiment has the following structural features in the staggered portion 21 of the main body 2.
That is, as shown in fig. 23 and 24, at least one of the heat-fusible resin layers 202 and 203 (two heat-fusible resin layers 202 and 203 in the embodiment of fig. 23, and the inner heat-fusible resin layer 202 in the embodiment of fig. 24) of the body blank 20A has extension portions 2021a and 2031a extending outward in the circumferential direction than the end face of the metal foil layer 201 at the inner end edge portion 204 which is the inner side of the body 2 of the both end edge portions of the body blank 20A. The end surfaces of the metal foil layer 201 are covered with the extensions 2021a, 2031a.
As a result, the end face of the metal foil layer 201 and the interface between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 can be prevented from contacting the content stored in the container 1 at the inner end 204 of the body blank 20A.
The extension portions 2021a, 2031a are preferably formed of a part of the hot-pressed portions 2021, 2031 formed on one or both surfaces of the inner end edge 204 of the body blank 20A.
More specifically, for example, as shown in fig. 25 (a), the inner edge 204, which is the inner side of the body 2, of the both end edges of the body blank 20A shown in fig. 9 (a) is hot-pressed using the seal bars B1, B2 arranged on both sides thereof.
As a result, the heat-fusible resin layers 202 and 203 heated and pressurized by the seal bars B1 and B2 are compressed in part, and the thickness thereof is reduced, and extend outward in the circumferential direction than the end face of the metal foil layer 201. As described above, the heat-seal resin layers 202 and 203 on the inner edge 204 of the body blank 20A are formed with the heat- seal portions 2021 and 2031 extending thinly, and the extension portions 2021a and 2031a are formed by portions of the heat- seal portions 2021 and 2031 extending outward in the circumferential direction than the end face of the metal foil layer 201. Further, since the 2 extending portions 2021a, 2031a are heated by the seal bars B1, B2 and are in a softened state or a flowing state, they can be deformed and flow in directions approaching each other, and thus the end face of the metal foil layer 201 can be coated (see fig. 25 (B)).
The hot press is performed at a heating temperature of 180 to 220 ℃ and a pressurizing force of 0.05 to 0.4MPa for a heating and pressurizing time of 1 to 5 seconds, for example. The seal bars B1 and B2 are preferably arranged such that a part of the seal bars in the width direction thereof protrudes from the inner end edge 204 of the body material 20A in a plan view.
The coating of the end surfaces of the metal foil layer 201 by the extension portions 2021a, 2031a of the heat-fusible resin layers 202, 203 in the inner end edge portion 204 of the body blank 20A is not necessarily performed simultaneously with the formation of the heat-pressed portions 2021, 2031. That is, for example, in the embodiment shown in fig. 24, at the inner end edge 204 of the body material 20A, the extension 2021a of the inner heat-fusible resin layer 202 is heated to be in a softened state or a flowing state when the staggered both end edges 204 and 205 of the body material 20A are heat-fused, and is deformed and flows toward the metal foil layer 201 side, thereby coating the end surface of the metal foil layer 201.
The thickness T2 of the hot-press-worked portions 2021, 2031 of the heat-fusible resin layers 202, 203 is preferably 1/5 to 1/2 times, more preferably 1/3 to 1/2 times the thickness T1 of the other portions of the heat-fusible resin layers 202, 203. Specifically, for example, when the thickness T1 of the normal portion of the heat-fusible resin layers 202 and 203 is 5 to 80 μm, the thickness T2 of the heat-pressed portions 2021 and 2031 is about 1 to 40 μm. Further, the circumferential width W1 of the portion of the heat-pressed portions 2021, 2031 laminated with the metal foil layer 201 is preferably 2 to 10mm (more preferably 4 to 8 mm), and the extension protrusion width W2 of the extension portions 2021a, 2031a is preferably 1 to 4mm (more preferably 1 to 3 mm).
In the staggered portion 21 of the main body 2 of the cup-shaped container 1, the total thickness T3 of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203, which are heat-fused to each other, of the both end edges 204 and 205 of the main body preform 20A is preferably 8 to 150 μm, and more preferably 16 to 80 μm (see fig. 23 and 24). If the total thickness T3 is less than 8 μm, the sealability of the staggered portions 21 may be insufficient. On the other hand, if the total thickness T3 exceeds 150 μm, the barrier properties of the staggered portions 21 may be impaired.
In addition, at the staggered portion 21 of the body 2, the overlapping width W3 of the metal foil layers 201, 201 at the both end edges 204, 205 of the body blank 20A is preferably 2 to 10mm, more preferably 4 to 8mm, as viewed in the thickness direction (see fig. 23 and 24). If the overlap width W3 is less than 2mm, barrier properties of the staggered portions 21 may be impaired, and sealing width may be too small to provide sufficient sealing properties. On the other hand, if the overlap width W3 exceeds 10mm, the width of the staggered portion 21 becomes excessively large, which leads to an increase in cost, and further, there is a possibility that a difference in stress applied to the inner portion (the inner edge portion 204 of the body material 20A) and the outer portion (the outer edge portion 205 of the body material 20A) of the staggered portion 21 causes a wrinkle or the like in the inner portion of the staggered portion 21, which may cause an appearance defect.
According to the cup-shaped container 1 of embodiment 7, the following effects can be exhibited.
p) the heat-fusible resin layers 202 and 203 of the body blank 20A have the extension portions 2021a and 2031a extending outward in the circumferential direction from the end face of the metal foil layer 201 at the inner end edge portion 204 which is the inner side of the body 2 among the both end edge portions of the body blank 20A, and the end face of the metal foil layer 201 and the interface between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are covered with the extension portions 2021a and 2031a, so that these portions are not exposed to the contents. Therefore, deterioration due to delamination or corrosion at the inner end 204 of the body material 20A can be effectively suppressed, and the present invention is also desirable in terms of hygiene.
In addition, when the extending portions 2021a, 2031a are constituted by a part of the hot-pressed portions 2021, 2031 formed on one or both surfaces of the inner end edge 204 of the body blank 20A, the extending portions 2021a, 2031a can be easily and reliably formed, and the end surfaces of the metal foil layer 201 and the like can be simultaneously coated by the extending portions 2021a, 2031 a.
In the case of the cup-shaped container 1 of embodiment 7, although not shown, in the above configuration, the heat-fusible resin layers 202 and 203 of the body material 20A may have the extension portions 2021a and 2031a extending outward in the circumferential direction than the end face of the metal foil layer 201, and the end face of the metal foil layer 201 may be covered with the extension portions 2021a and 2031a at the outer end edge portion 205 which is the outer side of the body 2 of the both end edge portions of the body material 20A. Thus, deterioration due to delamination and corrosion can be effectively suppressed even at the outer edge 205 of the body material 20A.
In the cup-shaped container of the present embodiment, the body may be formed by overlapping and joining both end edges of the body material (see fig. 19 and 20). In this embodiment, as in the above-described embodiment, it is also preferable that the heat-fusible resin layer of the body material has a portion extending outward in the circumferential direction from the end face of the metal foil layer at one or both end edges of the body material, and the end face of the metal foil layer is covered with the portion, whereby deterioration due to delamination and corrosion at the end edges can be effectively suppressed.
< embodiment 8 >
Fig. 26 to 29 are views showing a cup-shaped container 1 according to embodiment 8 of the present invention.
The cup-shaped container 1 of the present embodiment has the following structural features in the staggered portion 21 of the main body 2.
That is, as shown in fig. 26 to 29, the thickness T1 of the portion of the metal foil layer 201 constituting the body blank 20A located on the inner side of the body 2 at the inner end surface 204 of the body blank 20A is smaller than the thickness T2 of the other portion of the metal foil layer 201. Thus, the area of the metal foil layer 201 portion in the inner end surface 204 of the body blank 20A is reduced.
The metal foil layer 201 portion and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 in the inner end face 204 of the body blank 20A are covered with a resin film or resin pool R1 formed by melt-solidifying a part of the resin constituting at least one heat- fusible resin layer 202 and 203 of the body blank 20A at the time of heat-welding.
Here, the thickness T1 of the metal foil layer 201 portion constituting the inner end surface 204 of the body blank 20A is preferably 1/100 to 1/2 times, more preferably 1/10 to 1/3 times, the thickness T2 of the other portion of the metal foil layer 201 (see fig. 29). If the thickness T1 is less than 1/100 times the thickness T2, the inner end surface 204 is likely to be deformed, and the joint of the staggered portions 21 and the touch feeling after processing may be adversely affected. On the other hand, if the thickness T1 exceeds 1/2 times the thickness T2, the resin at the time of heat welding is not likely to sufficiently enter. Specifically, the thickness T1 of the metal foil layer 201 is, for example, 1 to 100 μm (preferably 5 to 60 μm), and the thickness T2 is 40 to 200 μm (preferably 80 to 160 μm).
To explain the above-described configuration in more detail, at the staggered portion 21 of the body 2 of the cup-shaped container 1, the inner end surface 204 of the metal foil layer 201 of the body blank 20A constituting the body blank 20A and the portion 201a in the vicinity thereof have a wedge-shaped cross section.
The circumferential width W1 of the cross-sectional wedge-shaped portion 201a is preferably 0.01 to 10mm, more preferably 0.1 to 8mm.
In the embodiment shown in fig. 26 and 29 (a), a cross-sectional tapered portion 201a of the metal foil layer 201 of the body blank 20A has a cross-section of a substantially isosceles trapezoid (or a substantially isosceles triangle), in which an outer side surface that becomes an outer side of the body 2 is formed as an inclined surface that forms an obtuse angle with an outer side surface of other portions of the metal foil layer 201, and an inner side surface that becomes an inner side of the body 2 is formed as an inclined surface that forms an obtuse angle with an inner side surface of other portions of the metal foil layer 201. In addition, the inner end surface 204 and the vicinity thereof in the body blank 20A as a whole have a substantially isosceles trapezoid cross section.
In this embodiment, as shown in fig. 26, a stepped portion 206 bent in a crank shape so as to follow the inclined surface of the outer side surface of the portion 201a forming the cross-sectional wedge shape of the metal foil layer 201 is formed at the outer end edge portion of the main body blank 20A located at the outer side of the main body 2. With this stepped portion 206, the inner end surface 204 of the body material 20A is more easily covered with the resin film or the resin pool R1 generated by the heat welding.
In the embodiment shown in fig. 27 and 29 (b), a portion 201a of the metal foil layer 201 having a wedge-shaped cross section has a cross section that is substantially not isosceles trapezoid (or substantially right triangle), wherein an outer side surface that becomes an outer side of the main body 2 is formed as an inclined surface that forms an obtuse angle with an outer side surface of other portions of the metal foil layer 201, and an inner side surface that becomes an inner side of the main body 2 is flush with an inner side surface of other portions of the metal foil layer 201. In response, the inner end surface 204 of the body material 20A and the vicinity thereof also have a cross section substantially different from an isosceles trapezoid as a whole.
In the case of this embodiment, as shown in fig. 27, a stepped portion 206 bent in a crank shape so as to follow the inclined surface of the outer side surface of the portion 201a forming the cross-sectional wedge shape of the metal foil layer 201 is also formed at the outer end edge portion located outside the main body 2 among the staggered both end edge portions of the main body material 20A.
In the embodiment shown in fig. 28 and 29 (c), the cross-sectional tapered portion 201a of the metal foil layer 201 has a cross-section that is substantially not isosceles trapezoid (or substantially right triangle), and the outer side surface that becomes the outer side of the main body 2 is flush with the outer side surface of the other portion of the metal foil layer 201, and the inner side surface that becomes the inner side of the main body 2 is an inclined surface that forms an obtuse angle with the inner side surface of the other portion of the metal foil layer 201. In response, the inner end surface 204 of the body material 20A and the vicinity thereof also have a cross section substantially different from an isosceles trapezoid as a whole.
The above-described cross-sectional tapered portion 201a of the metal foil layer 201 of the body blank 20A can be obtained, for example, by: the laminate 20, which is a material, is subjected to punching processing to form a blank 20A for a body by forming a bevel or the like at a contact portion of a die by punching.
The portion 201a may be formed by press working a desired portion of the body blank 20A formed by a usual method.
According to the cup-shaped container 1 of the present embodiment, the following effects can be exhibited.
q) in the staggered portion 21 of the body 2, the thickness T1 of the portion of the metal foil layer 201 of the body blank 20A constituting the inner end face 204 of the body blank 20A located inside the body 2 is smaller than the thickness T2 of the other portion of the metal foil layer 201, whereby the area of the portion of the metal foil layer 201 in the inner end face 204 of the body blank 20A is reduced. Therefore, the metal foil layer 201 portion and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 in the inner end face 204 of the body blank 20A are easily covered with the resin film or the resin pool R1 formed by melt-solidifying a part of the resin constituting the heat-fusible resin layers 202 and 203 of the body blank 20A at the time of heat welding, and are hardly exposed to the content, so that deterioration due to delamination and corrosion of the inner end face 204 can be effectively suppressed, and the heat-curable resin composition is also desirable in terms of hygiene. Further, since the level difference generated inside the staggered portion 21 of the main body 2 is reduced, a gap is less likely to be generated at the joint portion between the lower end portion 2a of the main body 2 and the suspended portion 32 of the folded portion 22 and the bottom body 3, and the flange portion 23 of the main body 2.
In addition, the inner end surface 204 of the metal foil layer 201 of the main body blank 20A and the portion 201A having a wedge-shaped cross section in the vicinity thereof are formed as inclined surfaces, i.e., inclined surfaces forming an obtuse angle with the outer side surface of the other portion of the metal foil layer 201, of the outer side surface of the main body 2, and a stepped portion 206 (see fig. 26 and 27) bent in a crank shape so as to follow the inclined surfaces is formed at the outer edge portion of the main body blank 20A, and in this case, the inner end surface 204 of the main body blank 20A is more likely to be covered with the resin film or the resin pool R1 formed at the time of heat welding, so that the above-described effects can be more reliably exhibited.
In the case of the cup-shaped container 1 of the present embodiment, the cross section 21 of the body 2 may be configured such that the thickness of the portion of the metal foil layer 201 of the body blank 20A constituting the outer end surface 205 of the body blank 20A located outside the body 2 is smaller than the thickness of the other portion of the metal foil layer 201, thereby reducing the area of the portion of the metal foil layer 201 of the outer end surface 205 of the body blank 20A. With the above configuration, the metal foil layer 201 portion of the outer end surface 205 of the body blank 20A and the interface portion between the metal foil layer 201 and the heat-fusible resin layers 202 and 203 are easily covered with a resin film or resin pool formed by melting and solidifying a part of the resin constituting at least one heat- fusible resin layer 202 and 203 of the body blank 20A at the time of heat welding, and therefore deterioration due to delamination and corrosion of the outer end surface 205 can be effectively suppressed.
In the cup-shaped container of the present embodiment, the body may be formed by overlapping and joining both end edges of the body material (see fig. 19 and 20). In this embodiment, as in the above embodiment, it is preferable that the thickness of at least a portion of the metal foil layer of the body blank constituting at least one end face of the body blank is smaller than the thickness of other portions of the metal foil layer, whereby deterioration due to delamination and corrosion of the end face can be effectively suppressed.
Examples
Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.
Example 1 >
The two surfaces of the aluminum foil (A8021H-O) with the thickness of 100 μm, which were subjected to the chemical conversion treatment, were coated with about 3g/m 2 Two-part curable polyurethane adhesive of (2) and dry-laminating an unstretched polypropylene film (CPP) having a thickness of 60. Mu.m. Then, a predetermined aging treatment is performed to cure the adhesive, thereby producing a laminate. Here, the unstretched polypropylene film uses a 3-layer structure including random polypropylene (rPP). By being based on JIS K7210-1: the MFR of each layer measured by the test method of 2014 (temperature 230 DEG, load 2.16 kgf) was 7 to 18, and the average value of the MFR of the 3 layers was 11.
Next, the obtained laminate is punched out into a predetermined shape to form a body material and a base material (see fig. 9 and 10).
Next, using the body blank and the base blank, a cup-shaped container shown in fig. 1 and 2 was produced in the same process as in embodiment 1, and this was used as example 1.
The cup-shaped container thus obtained was a container having excellent barrier properties, in which aluminum foil having a thickness of 100 μm was used, and oxygen and water vapor were not substantially transmitted.
The dimensions of the cup-shaped container were as follows.
(size of cup-shaped Container)
Inner diameter of the opening in the upper part of the cup-shaped container: 65mm of
Inner diameter of the lower part of the cup-shaped container: 50mm
Width of flange portion: 4mm of
Height of cup-shaped container: 95mm of
Height of the foot (return portion 22) of the cup-shaped container: 6mm of
Width of the staggered portion of the main body (overlap amount): 8mm of
Further, the staggered portion of the body of the cup-shaped container was cut in the transverse direction, and the cut surface was observed with a microscope, and it was confirmed that the inner end surface of the body preform was covered with the inner resin reservoir formed at the time of heat welding, and the outer end surface of the body preform was covered with the outer resin reservoir formed at the time of heat welding.
Example 2 >
The two surfaces of the aluminum foil (A8021H-O) with the thickness of 100 μm, which were subjected to the chemical conversion treatment, were coated with about 3g/m 2 A two-part curing polyurethane adhesive, and an unstretched polypropylene film (CPP) having a thickness of 40 μm was dry-laminated. Then, a predetermined aging treatment is performed to cure the adhesive, thereby producing a laminate. Here, a co-extruded film formed of an ethylene-propylene random copolymer layer (melting point=130℃) having a thickness of 12 μm and a homo-polypropylene (rPP) layer (melting point=160℃) having a thickness of 28 μm was used as the unstretched polypropylene film, and the surface of the film on the ethylene-propylene random copolymer layer side was bonded to an aluminum foil.
Next, the obtained laminate is punched out into a predetermined shape to form a body material and a base material (see fig. 9 and 10).
Next, a cup-shaped container shown in fig. 1 and 2 was produced by the same process as in embodiment 2 using a body blank and a base blank, and this was set as example 2.
The cup-shaped container thus obtained was a container having excellent barrier properties, in which aluminum foil having a thickness of 100 μm was used, and oxygen and water vapor were not substantially transmitted.
The dimensions of the cup-shaped container were as follows.
Inner diameter of the opening in the upper part of the cup-shaped container: 65mm of
Inner diameter of the lower part of the cup-shaped container: 50mm
Width of flange portion: 4mm of
Height of cup-shaped container: 95mm of
Height of foot (return portion (22)) of cup-shaped container: 6mm of
Width of the staggered portion of the main body (overlap amount): 8mm of
Further, the staggered portion of the body of the cup-shaped container was cut in the transverse direction, and the cut surface was observed by a microscope, and it was confirmed that the inner end surface of the body preform was covered with a protective film formed by random co-lamination of ethylene and propylene during thermal welding, and the outer end surface of the body preform was covered with a protective film formed by random co-lamination of ethylene and propylene during thermal welding.
Example 3 >
The two surfaces of the aluminum foil (A8021H-O) with the thickness of 100 μm, which were subjected to the chemical conversion treatment, were coated with about 3g/m 2 Two-part curable polyurethane adhesive of (2) and dry-laminating an unstretched polypropylene film (CPP) having a thickness of 30 μm. Then, a predetermined aging treatment is performed to cure the adhesive, thereby producing a laminate.
Next, the obtained laminate is punched out into a predetermined shape, and a body material and a base material are formed (see fig. 9 and 10).
Next, a cup-shaped container of the embodiment shown in fig. 1 and 2 was produced by the same process as in embodiment 3 using a body blank and a base blank, and this was set as example 3.
The cup-shaped container uses aluminum foil having a thickness of 100 μm, and is therefore a good container having barrier properties against oxygen and water vapor.
The dimensions of the cup-shaped container were as follows.
Inner diameter of the opening in the upper part of the cup-shaped container: 65mm of
Inner diameter of the lower part of the cup-shaped container: 50mm
Width of flange portion: 4mm of
Height of cup-shaped container: 95mm of
Height of the foot (drop (32)) of the cup-shaped container: 6mm of
Width of the staggered portion of the main body (staggered amount): 8mm of
In addition, in the production of the cup-shaped container, in each of the 4 th step of forming the main body and the 5 th step of integrating the main body and the base body, the heat welding for 2 stages was performed under the following sealing conditions.
[ 1 st heat fusion ]
Using a machine: heat sealing machine
Sealing temperature: 180 DEG C
Sealing time: 2sec
Load of: 150kgf
[ 2 nd heat fusion ]
Using a machine: high-frequency sealing device (BME type BMD-1S)
Output setting: 0.75kW
Sealing time: 3.0sec
Load of: 100kgf
Coil distance: 5mm of
Comparative example 1 >
A cup-shaped container was produced in the same manner as in example 3 except that only 1 time of heat welding was performed under the same conditions as those of the 1 st time of heat welding in example 3 in each of the 4 th step of forming the body and the 5 th step of integrating the body and the base, and this was referred to as comparative example 1.
< inspection of tightness of Container >
The test was performed as follows: 10 cup-shaped containers of example 3 and comparative example 1 were prepared, each of which was left for 120 minutes with 50cc of red-colored water added thereto, and then visually inspected for coloration at the staggered portions of the main body or at the seal portions of the lower end portions of the main body and the hanging portions of the base, to confirm whether or not water leaked from the staggered portions of the main body or the seal portions of the lower end portions of the main body and the hanging portions of the base.
In the case of example 3, no coloration was observed in each container at the staggered portion of the main body and at the seal portion between the lower end portion of the main body and the hanging portion of the base.
On the other hand, in comparative example 1, coloring was observed in the staggered portion of the main body in 2 containers.
Industrial applicability
The present invention can be preferably used for a cup-shaped container containing, for example, a flowable food, a beverage, or the like as a content, and a method for manufacturing the same.
Claims (18)
1. A cup-shaped container, comprising:
a main body formed by interlacing and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
In which a main body and a base body are integrated by engaging an inner surface of a lower end portion of the main body with an outer surface of a hanging portion of the base body, characterized in that,
the body blank is formed from a laminate comprising a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the mutually overlapping surfaces of the both end edge portions to each other,
the base blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the upper side of the base of the two sides of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting these sides to each other,
in the cup container, at the staggered portion of the main body, the inner end surface of the main body preform located inside the main body is covered with an inner resin reservoir formed when the heat-sealable resin layers at both end edges of the main body preform are heat-sealed to each other.
2. The cup-shaped container according to claim 1, wherein when the thickness of the metal foil layer in the body blank is T1, the thickness of the inner heat-fusible resin layer located inside the body is T2, and the thickness of the outer heat-fusible resin layer located outside the body is T3, T1: t2: t3=1: 0.3 to 1.5:0.2 to 1, and T2 is more than or equal to T3.
3. The cup-shaped container according to claim 1, wherein the melt Mass Flow Rate (MFR) of the inner heat-fusible resin layer located inside the body in the body preform is 1 to 10g/10 min.
4. The cup-shaped container according to claim 1, wherein the inner heat-fusible resin layer located inside the main body in the blank for the main body includes 2 or more thermoplastic resin layers, wherein the melt mass flow rate or MFR of the sealing side thermoplastic resin layer constituting the inner surface of the main body in the thermoplastic resin layers is 3 to 10g/10 min, and wherein the melt mass flow rate or MFR of the lamination side thermoplastic resin layer laminated on the metal foil layer in the thermoplastic resin layers is 3 to 10g/10 min.
5. The cup-shaped container according to claim 1, wherein the inner end surface of the body blank is formed as an inclined surface facing the outer side of the body.
6. The cup-shaped container according to claim 1, wherein a stepped portion bent in a crank shape so as to face an inner end face of the body preform is formed in a portion adjacent to an outer end edge portion which is an outer side of the body among the staggered end edge portions, and an inner resin reservoir is formed between the stepped portion and the inner end face of the body preform.
7. The cup-shaped container according to claim 1, further characterized in that, at the staggered portion of the main body, the outer end face of the main body blank located outside the main body is covered with an outer resin reservoir formed when the heat-fusible resin layers of both end edge portions of the main body blank are heat-fused to each other.
8. A cup-shaped container, comprising:
a main body formed by interlacing and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
in which a main body and a base body are integrated by engaging an inner surface of a lower end portion of the main body with an outer surface of a hanging portion of the base body, characterized in that,
the body blank is formed from a laminate comprising a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the mutually overlapping surfaces of the both end edge portions to each other,
the base blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the upper side of the base of the two sides of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting these sides to each other,
In the cup-shaped container, at least one of the 2 heat-fusible resin layers of the body blank comprises more than 2 layers, and the heat-fusible resin of the laminated side heat-fusible resin layer laminated on the metal foil layer in the more than 2 layers has a lower melting point than the heat-fusible resin of the other layers,
at the staggered portion of the main body, the metal foil layer portion of the inner end face of the main body blank located inside the main body and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with a protective film formed by melting and solidifying the heat-fusible resin constituting the laminate-side heat-fusible resin layer when the heat-fusible resin layers of both end edges of the main body blank are heat-fused to each other.
9. The cup-shaped container according to claim 8, wherein at the staggered portion of the main body, the metal foil layer portion of the outer end face of the main body blank located outside the main body and the interface portion between the metal foil layer and the heat-fusible resin layer are covered with a protective film formed by melting and curing the heat-fusible resin constituting the laminate-side heat-fusible resin layer when the heat-fusible resin layers of the both end edges of the main body blank are heat-fused to each other.
10. The cup-shaped container according to claim 8, wherein a melting point of the heat-fusible resin constituting the lamination-side heat-fusible resin layer is lower than a melting point of the heat-fusible resin constituting the other layers by 10 ℃ or more.
11. The cup-shaped container according to claim 10, wherein the melting point of the heat-fusible resin constituting the lamination-side heat-fusible resin layer is 110 to 140 ℃.
12. The cup-shaped container according to claim 8, wherein a melt Mass Flow Rate (MFR) of the heat-fusible resin constituting the laminate-side heat-fusible resin layer is 1 to 5g/10 minutes or more greater than a melt Mass Flow Rate (MFR) of the heat-fusible resin constituting the other layers.
13. The cup-shaped container according to claim 12, wherein the melt Mass Flow Rate (MFR) of the heat-fusible resin constituting the laminate-side heat-fusible resin layer is 4 to 10g/10 min.
14. A method of manufacturing a cup-shaped container according to claim 1 or 8, comprising:
punching a laminate including a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer to form a body blank;
Punching a laminate including a metal foil layer and a heat-fusible resin layer laminated on at least an upper surface of a base of both surfaces of the metal foil layer to form a base blank;
forming a bottom body having a substantially inverted U-shaped cross section by drawing a blank for the bottom body to form a bottom portion and a hanging portion extending downward from an outer peripheral edge portion of the bottom portion;
a step of forming a tubular body by interlacing both end edges of a body blank and thermally welding thermally weldable resin layers constituting mutually overlapping surfaces of the both end edges; and
a step of integrating the main body with the base by overlapping the inner surface of the lower end portion of the main body with the outer surface of the hanging portion of the base and thermally welding the thermally weldable resin layers constituting the surfaces to each other,
in the above manufacturing method, in the step of forming the tubular body, the heat-sealable resin layers at both end edges of the body blank are heat-sealed 2 times, and the heat-sealing at the 2 nd time is heat-sealed by high-frequency sealing.
15. The method of manufacturing a cup-shaped container according to claim 14, wherein in the step of integrating the main body and the base body, the heat-sealing of the heat-sealing resin layers of the lower end portion of the main body and the hanging portion of the base body is performed 2 times, and the 2 nd heat-sealing is heat-sealing performed by high-frequency sealing.
16. The method of manufacturing a cup-shaped container according to claim 15, wherein in the step of forming the base material, a laminate in which heat-fusible resin layers are laminated on both sides of the metal foil layer is used as the laminate,
in the step of integrating the main body with the base, the main body is folded back inward from the lower end opening edge portion thereof so as to enclose the hanging portion of the base, and the main body and the base are integrated by heat-welding the heat-fusible resin layers constituting the surfaces of the lower end portion of the main body and the hanging portion of the folding portion and the base to each other, and the heat-welding of the heat-fusible resin layers of the lower end portion of the main body and the hanging portion of the folding portion and the base is performed 2 times, and the 2 nd heat-welding is performed by high-frequency sealing.
17. A method of manufacturing a cup-shaped container according to claim 1 or 8, comprising:
punching a laminate including a metal foil layer and heat-fusible resin layers laminated on both sides of the metal foil layer to form a body blank;
punching a laminate including a metal foil layer and a heat-fusible resin layer laminated on at least an upper surface of a base of both surfaces of the metal foil layer to form a base blank;
Forming a bottom body having a substantially inverted U-shaped cross section by drawing a blank for the bottom body to form a bottom portion and a hanging portion extending downward from an outer peripheral edge portion of the bottom portion;
a step of forming a tubular body by interlacing both end edges of a body blank and thermally welding thermally weldable resin layers constituting mutually overlapping surfaces of the both end edges; and
a step of integrating the main body and the base body by thermally welding heat-fusible resin layers constituting the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base body,
in the manufacturing method, in the step of integrating the main body and the base, the heat-fusible resin layers of the lower end portion of the main body and the hanging portion of the base are heat-fused to each other 2 times, and the 2 nd heat-fusion is heat-fused by high-frequency sealing.
18. The method of manufacturing a cup-shaped container according to claim 17, wherein in the step of forming the base material, a laminate in which heat-fusible resin layers are laminated on both sides of the metal foil layer is used as the laminate,
in the step of integrating the main body with the base, the main body is folded back inward from the lower end opening edge portion thereof so as to enclose the hanging portion of the base, and the main body and the base are integrated by heat-welding the heat-fusible resin layers constituting the surfaces of the lower end portion of the main body and the hanging portion of the folding portion and the base to each other, and the heat-welding of the heat-fusible resin layers of the lower end portion of the main body and the hanging portion of the folding portion and the base is performed 2 times, and the 2 nd heat-welding is performed by high-frequency sealing.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019226555 | 2019-12-16 | ||
| JP2019-226555 | 2019-12-16 | ||
| JP2019-233927 | 2019-12-25 | ||
| JP2019233925 | 2019-12-25 | ||
| JP2019233927 | 2019-12-25 | ||
| JP2019-233925 | 2019-12-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112978004A CN112978004A (en) | 2021-06-18 |
| CN112978004B true CN112978004B (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011489945.6A Active CN112978004B (en) | 2019-12-16 | 2020-12-15 | Cup-shaped container and method for manufacturing same |
| CN202023036904.XU Withdrawn - After Issue CN214649652U (en) | 2019-12-16 | 2020-12-15 | Cup-shaped container |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023036904.XU Withdrawn - After Issue CN214649652U (en) | 2019-12-16 | 2020-12-15 | Cup-shaped container |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR20210076849A (en) |
| CN (2) | CN112978004B (en) |
| TW (1) | TW202142450A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20210076849A (en) * | 2019-12-16 | 2021-06-24 | 쇼와 덴코 패키징 가부시키가이샤 | Cup shaped container and manufacturing method therof |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5830955A (en) | 1981-08-10 | 1983-02-23 | 三陽紙器株式会社 | Vessel with sealing cover |
| CN1047993C (en) * | 1995-04-28 | 2000-01-05 | 东洋油墨制造株式会社 | Paper container for fluid substances, and inside lid therefor |
| JPH1029617A (en) * | 1996-07-16 | 1998-02-03 | Toppan Printing Co Ltd | Paper container having plastic ring |
| JP4054578B2 (en) * | 2002-01-10 | 2008-02-27 | 東罐興業株式会社 | Cup-shaped heat-resistant paper container and manufacturing method thereof |
| JP2005112425A (en) * | 2003-10-09 | 2005-04-28 | Toppan Printing Co Ltd | Packaging paper sheet and packaging container formed from the packaging paper sheet |
| JP2007176505A (en) | 2005-12-27 | 2007-07-12 | Yoshino Kogyosho Co Ltd | Synthetic resin cuplike container |
| JP2007210639A (en) | 2006-02-09 | 2007-08-23 | Dainippon Printing Co Ltd | Paper cup |
| JP2008222244A (en) * | 2007-03-09 | 2008-09-25 | Toppan Printing Co Ltd | Cup-shaped paper container, and its manufacturing method |
| JP2009102038A (en) * | 2007-10-23 | 2009-05-14 | Toppan Printing Co Ltd | Paper container |
| CA2762818C (en) * | 2009-05-21 | 2014-02-11 | Zhiquan Q. Yan | Hermetically sealed paperboard containers with enhanced barrier performance |
| RU2549053C2 (en) * | 2009-06-23 | 2015-04-20 | Топпан Принтинг Ко., Лтд. | Retort-barrel |
| JP2013542138A (en) * | 2011-09-28 | 2013-11-21 | ドンファン ピョン | Folding paper cup side paper molding method and folding paper cup |
| KR20210076849A (en) * | 2019-12-16 | 2021-06-24 | 쇼와 덴코 패키징 가부시키가이샤 | Cup shaped container and manufacturing method therof |
-
2020
- 2020-12-11 KR KR1020200173060A patent/KR20210076849A/en unknown
- 2020-12-14 TW TW109144088A patent/TW202142450A/en unknown
- 2020-12-15 CN CN202011489945.6A patent/CN112978004B/en active Active
- 2020-12-15 CN CN202023036904.XU patent/CN214649652U/en not_active Withdrawn - After Issue
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| Publication number | Publication date |
|---|---|
| KR20210076849A (en) | 2021-06-24 |
| CN112978004A (en) | 2021-06-18 |
| TW202142450A (en) | 2021-11-16 |
| CN214649652U (en) | 2021-11-09 |
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