JP2022019232A - Paper-made container - Google Patents

Abstract

To provide a paper-made container which is easy to open, has no possibility that dust, dirt, etc. enter a cut provided to an inner lid, is strong against impacts from the outside, and can prevent the inner lid, to which cut-working is performed, from being broken during transportation, etc.SOLUTION: A paper-made container includes: a tray comprising a flange part on a circumference of an opening part; and a paper-made lid material joined to the flange part. The paper-made lid material includes an inner lid and an outer lid, and the inner lid is provided with a rear half-cut along the circumference at the inside of the circumference of the opening part and a front half-cut along the circumference on the circumference side of the opening part than the rear half-cut, or provided with a perforation penetrating so as to be along the circumference at the inside of the circumference of the opening part, and the outer lid is peelably bonded to the inner lid so as to cover the whole outer surface of the inner lid.SELECTED DRAWING: Figure 1

Description

The present invention relates to a paper container provided with a lid material.

Conventionally, there is a paper container provided with a lid material.
For example, Patent Document 1 proposes a lid material characterized in that it is heat-bonded to and sealed with a polyethylene layer at a flange portion of a paper container in which a polyethylene layer is laminated on the inner surface, and the layers are peeled off by a heat-sealing layer. ing.
Further, for example, Patent Document 2 proposes a paper container having a lid material having a mouth that can be cut off by a perforation.
Further, for example, in Patent Document 3, a paper lid material for sealing a seal portion having substantially the same shape as the flange portion is provided on the flange portion, and a peripheral back half cut line is provided along the inner edge of the seal portion, and further, the peripheral edge back is further provided. A paper lid material having a peripheral surface half-cut line having a certain width on the outside of the half-cut line has been proposed.

Japanese Patent No. 3654966 Jitsukaisho 53-95344 Gazette Japanese Unexamined Patent Publication No. 2000-309375

In the case of a lid material using a so-called easily openable sealant film containing a heat-sealing layer such as the paper container described in Patent Document 1, cohesive failure occurs in the layer of the easily openable sealant film as in this document at the time of opening. Peel off or peel off between the flange and the easy-to-open sealant film. However, when the box is sealed with a lid material using an easily openable sealant film, the piercing strength is weak, and the film may be torn by the impact of protrusions from the outside. Further, at the time of opening, the sealant film is coagulated and broken in the layer of the easy-to-open sealant film and peeled off, or the flange and the easy-to-open sealant film are peeled off from each other.

In the paper container described in Patent Document 2, easy-opening property is imparted by a perforation which is a penetrating notch provided in the lid material. However, there is a risk that dust or the like may enter through the perforations (through holes) that are the cuts that have penetrated.

In the paper container described in Patent Document 3, the front and back halves of the paper lid material are provided for easy opening. In this case, since the notch does not penetrate the paper, it is possible to prevent dust and dirt from entering the contents, but if the paper container is dropped or the lid material is impacted from the outside during transportation, The half-cut part may be destroyed and the lid material may be torn.

Therefore, the present invention is easy to open, there is no risk of dust or the like invading the cut provided in the inner lid, it is strong against an external impact, and the inner lid which has been cut during transportation is damaged. The challenge is to provide a paper container that can be prevented.

The invention according to claim 1 is
It has a tray with a flange on the periphery of the opening and a paper lid joined to the flange.
The paper lid material has an inner lid and an outer lid, and has an inner lid and an outer lid.
The inner lid is provided with a back half cut along the peripheral edge inside the peripheral edge of the opening, and a front half cut is provided along the peripheral edge on the peripheral edge side of the opening from the back half cut.
The outer lid is detachably adhered to the inner lid so as to cover the entire outer surface of the inner lid.
It is a paper container characterized by this.

The invention according to claim 2 is
It has a tray with a flange on the periphery of the opening and a paper lid joined to the flange.
The paper lid material has an inner lid and an outer lid, and has an inner lid and an outer lid.
The inner lid is provided with a perforation that penetrates along the peripheral edge inside the peripheral edge of the opening.
The outer lid is detachably adhered to the inner lid so as to cover the entire outer surface of the inner lid.
It is a paper container characterized by this.

The invention according to claim 3 is
The paper container according to claim 1 or 2, wherein the lid material is provided with a knob.

The paper container of the present invention has a tray having a flange portion on the peripheral edge of the opening and a paper lid material joined to the flange portion, and the paper lid material has an inner lid and an outer lid. However, the inner lid is provided with a back half cut along the peripheral edge inside the peripheral edge of the opening and a front half cut along the peripheral edge on the peripheral edge side of the opening from the back half cut, or the peripheral edge of the opening. Perforations are provided on the inside along the periphery, and the outer lid is detachably adhered to the inner lid so as to cover the entire outer surface of the inner lid.
Therefore, the inner lid is separated into front and back in the layer between the front and back half cuts, and the inner lid is peeled off from the tray. Easy to open without the need for force. In addition, since the strong outer lid made of paper covers and protects the inner lid, there is no risk of dust or dirt entering the cut of the inner lid, and it is also resistant to external impacts, and the cut is processed during transportation. It is possible to prevent damage to the inner lid provided with.

(A) A perspective view of a paper container according to the first embodiment of the present invention in a sealed state. (B) A perspective view showing a state in which the outer lid of the paper container of the first embodiment is peeled off from the inner lid. (C) A perspective view showing a state in which the inner lid of the paper container of the first embodiment is peeled off from the tray. The figure which shows the blank of the tray of the paper container of 1st Embodiment of this invention. The perspective view of the tray of the paper container of 1st Embodiment of this invention. FIG. 1A is a cross-sectional view taken along the line AA of FIG. 1 (a). FIG. 1 (a) is a sectional view taken along line BB. (A) FIG. 1 (a) is a sectional view taken along line CC of the paper container of FIG. 1 (a). (B) The figure corresponding to FIG. 6 (a) which shows the state after opening of the paper container of FIG. 1 (a). (A) An enlarged sectional view taken along line DD of FIG. 1 (a). (B) FIG. 1 (b) is an enlarged sectional view taken along line EE. (C) FIG. 1 (c) is an enlarged sectional view taken along line FF. A laminate that constitutes a sheet-like material that constitutes the outer lid paper, the inner lid paper, and the tray paper of the lid material of the paper container of the first embodiment. (A) A perspective view of a paper container according to a second embodiment of the present invention. (B) FIG. 9 (a) is an enlarged sectional view taken along line GG. FIG. 9 (a) is a cross-sectional view taken along the line HH. FIG. 9 (a) is a sectional view taken along line II. (A) A perspective view of the paper container of Comparative Example 1. (B) JJ line enlarged cross-sectional view of FIG. 12 (a). (A) A perspective view of the paper container of Comparative Example 2. (B) KK line enlarged cross-sectional view of FIG. 13 (a). (A) A perspective view of the paper container of Comparative Example 3. (B) LL-line enlarged cross-sectional view of FIG. 14 (a).

Hereinafter, an example of an embodiment of the paper container according to the present invention will be described with reference to the drawings as necessary.

<First Embodiment>
The paper container 100 of the first embodiment will be described with reference to FIGS. 1 to 8.

FIG. 1 (1) is a perspective view of a state in which the outer lid 2 of the paper container 100 of the first embodiment is sealed, and FIG. 1 (2) is a perspective view of the outer lid 2 of the paper container 100 of the first embodiment. Is a perspective view showing a state in which the inner lid 3 is peeled off from the inner lid 3, and FIG. 1 (3) is a perspective view showing a state in which the inner lid 3 of the paper container 100 of the first embodiment is peeled off from the tray 4. .. In the paper container 100 of the first embodiment, for example, frozen food is stored as the content 10, the frozen food which is the content 10 is thawed by heating the paper container 100 together with the microwave oven, and the lid material 1 is trayed. After peeling from 4 and opening, the tray 4 can be eaten as it is. As shown in FIG. 6, the paper container 100 of the present embodiment has a tray 4 having a flange portion 7 on the peripheral edge 6 of the opening 5, and a paper lid material 1 joined to the flange portion 7. .. The paper lid material 1 has an inner lid 3 and an outer lid 2. The inner lid 3 is provided with a back half cut 9 along the peripheral edge inside the peripheral edge 6 of the opening 5, and a front half cut 9 is provided along the peripheral edge side of the opening 5 from the back half cut 9. 8 is provided. The outer lid 2 is detachably adhered to the inner lid 3 so as to cover the entire outer surface of the inner lid 3. Here, the outer surface is the surface opposite to the tray 4, that is, the surface opposite to the content 10.

FIG. 2 is a diagram showing a blank 200 of the tray 4 of the paper container 100 of the present embodiment.
As shown in FIG. 2, side plates 52 and 52 are connected to the two opposite sides of the quadrangular bottom plate 51 via mountain fold lines, respectively, and valley fold lines are formed on the outer periphery of the side plates 52 and 52. The edge pieces 53 and 53 are connected to each other, and the tongue pieces 56 and 56 extending laterally are provided at the left and right ends of the edge pieces 53 and 53, respectively. Inverted triangular fold-in joint plates 54, 54 are connected to the left and right ends of the side plate 52, 52 via mountain fold lines, respectively, and the outer circumferences of the fold-in joint plates 54, 54 are connected via valley fold lines. The joint edge pieces 55 are connected in series. The second side surface plates 57 and 57 are connected to the other two opposite sides of the bottom plate 51 via the mountain fold line, respectively, and the outer periphery of the second side surface plates 57 and 57 is connected to the outer periphery of the second side surface plates 57 and 57 via the valley fold line. Two edge pieces 58, 58 are connected in series, and second tongue pieces 59, 59 extending in the lateral direction are provided at the left and right ends of the second edge pieces 58, 58, respectively. Inverted triangular second folding joint plates 60, 60 are connected to the left and right ends of the second side surface plates 57, 57, respectively, via valley fold lines. A mountain fold line is formed between the edge of the folding joint plate 54 that is not connected to the side plate 52 and the edge of the second folding joining plate 60 that is not connected to the second side plate 57. When the side plates are bent and assembled into a tray shape, the edge pieces 53, 53, the second edge pieces 58, 58, and the joint edge pieces 55, 55 form the same plane, respectively. It is set. The edge pieces 53, 53, the second edge pieces 58, 58, and the joint edge pieces 55, 55 are portions that become the flange portion 7 when assembled on the tray 4. Further, a small protrusion 61 projecting toward the second folding joint plate is provided at the end edge of the second tongue piece 59 in the vicinity where the second tongue piece 59 and the second folding joint plate 60 at each corner are in contact with each other.

It is also possible to use a blank in which the joint edge piece 55 is not provided on the outer periphery of the folding joint plate 54. In this case, the folding joint plate 54 and the second folding joint plate 60 can be bent and adhered to the outside or the inside of each side plate, whichever method can be adopted.

FIG. 3 is a perspective view of the tray 4 of the paper container 100 of the first embodiment. Assembling from the blank 200 to the tray 4 is performed as follows.
Each side plate is bent and assembled into a tray shape, and first, the inner surfaces of the folding joint plate 54 and the second folding joint plate 60 are adhered to each other. Next, the two bonded plates are bent toward the second side plate, the second side plate 57 and the second folded joint plate 60 are adhered, and the edge piece 53, the second edge piece 58, and the joint edge piece are adhered to each other. The tray 4 is assembled by folding the 55 into valleys to bond the inside of the joint edge piece 55 and the outside of the second edge piece 58, and the inside of the tongue piece 56 and the outside of the second tongue piece 59.

By providing the protruding small protrusions 61 on the side of the second folding joint plate of the second tongue piece 59, each corner angle is covered by the small protrusions 61 to improve the sealing performance.

The bottom surface of the tray 4 when assembled on the tray 4 is a quadrangle, the front view in the assembled state is an inverted trapezoid, and the opening 5 is a quadrangle whose plan view is slightly larger than the bottom surface. The inner lid 3 and the outer lid 2 constituting the lid material 1 are substantially quadrangular shapes having substantially the same shape as the outer edge of the flange portion 7 on the peripheral edge of the tray 4. A knob portion 11 is provided at a corner portion of the substantially quadrangular lid material 1. As will be described later, the outer lid 2 is peeled off from the inner lid 3 from the knob portion 11a of the outer lid 2, and the inner lid 3 is peeled off from the tray 4 from the grip portion 11b of the inner lid 3.

The above shapes of the tray 4, the inner lid 3, and the outer lid 2 of the paper container 100 are examples, and the tray 4, the inner lid 3, and the outer lid 2 of the paper container 100 of the present invention are limited to the above shapes. I can't.

FIG. 4 is a sectional view taken along line AA of the tray 4 to which the grip portion 11 of the lid material 1 of FIG. 1A and the grip portion 11 thereof are joined. The grip portion 11b of the inner lid 3 is provided with two linear back half cuts extending toward the opening side as a picking half cut 12 for peeling off the entire grip portion 11b of the inner lid 3 from the tray 4. There is. FIG. 5 is a sectional view taken along line BB of the tray 4 to which the grip portion 11 of the lid material 1 of FIG. 1A and the grip portion 11 thereof are joined. The pinching portion 11b of the inner lid 3 is peeled off from the tray 4 along the picking half cuts 12 and 12, and the opening is started when the back half cut 9 for opening described later is peeled off.

As shown in FIGS. 1 (b) and 1 (c), the picking half cuts 12 and 12 and the opening table half cut 8 described later will be described later from the opening side ends of the picking half cuts 12 and 12. It is provided so as to be connected to the front half cut 8 for opening.

6 (a) is a sectional view taken along line CC of the paper container 100 of FIG. 1 (a). FIG. 6 (b) is a diagram corresponding to FIG. 6 (a) showing a state after opening the paper container 100 of FIG. 1 (a). The inner lid 3 is provided with a back half-cut 9 for opening inside the peripheral edge 6 of the opening 5 of the tray 4, and a front half-cut 8 for opening is provided on the peripheral edge side of the opening 5 from the back half-cut 9. Is provided. When opening the paper container 100, first, the entire outer lid 2 is peeled off from the inner lid 3, the inner lid 3 is separated into front and back in the layer between the front and back half cuts 8 and 9, and the inner lid 3 is the tray 4. It is peeled off from and opened. As described above, the inner lid 3 has an easy-to-open property.

Since the inner lid 3 having such an easy-opening property is sealed by the flange portion 7 of the tray 4, it is easy to open without requiring force. Further, since the strong outer lid 2 made of paper covers and protects the inner lid 3, it is strong against an impact from the outside and can prevent the inner lid 3 provided with a half cut during transportation or the like from being damaged.

(Method of opening the paper container 100 of the first embodiment)
In order to explain the method of opening the paper container 100, a cross-sectional view near the edge of the paper container 100 will be described below.
FIG. 7A is an enlarged cross-sectional view taken along the line DD in a state where the outer lid 2 of FIG. 1A is sealed. The outer lid 2 includes an outer lid paper 13 and an outer lid adhesive varnish 14 applied to the inner surface thereof. The outer lid adhesive varnish 14 is applied only to a portion overlapping the outer peripheral edge of the inner lid 3, for example, so that the outer lid 2 is detachably adhered to the inner lid 3. The outer lid adhesive varnish 14 is not applied on the opening front half cut 8 of the inner lid 3 so that the opening front half cut 8 of the inner lid 3 is not blocked and the easy opening property of the inner lid 3 is not impaired. Is preferable. Here, the inner surface is the tray side, that is, the content side. The inner lid 3 includes an inner lid paper 15 and an inner lid inner surface resin 16 laminated on the inner surface thereof. The tray 4 includes a tray paper 17 and a tray inner surface resin 18 laminated on the inner surface thereof (here, the lid material side). The inner lid 3 is provided with a back half cut 9 inside the peripheral edge 6 of the opening 5 of the tray 4, and a front half cut 8 is provided on the peripheral edge side of the opening 5 from the back half cut 9.

FIG. 7B is an enlarged cross-sectional view taken along the line EE in a state where the outer lid 2 of FIG. 1B is peeled off from the inner lid 3. After heating the paper container 100 in a microwave oven or the like, when the outer lid 2 is pulled up from the grip portion 11a, the outer lid adhesive varnish 14 applied to the outer lid 2 peels off the outer surface of the inner lid paper 15, and the outer lid 2 is inside. It is peeled off from the lid 3.

FIG. 7 (c) is an enlarged cross-sectional view taken along the line FF in a state where the inner lid 3 of FIG. 1 (c) is peeled off from the tray 4. When the inner lid 3 is pulled up from the knob portion 11b, the inner lid 3 is separated into front and back in the layer between the front and back half cuts 8 and 9, and the inner lid 3 is peeled off from the tray 4 and opened.

(Method for Creating Paper Container 100 of First Embodiment)
The method for creating the paper container 100 is as follows.
First, the sheet-shaped material is printed and punched to create a blank 200 for the tray 4. Next, the tray 4 is created from the blank 200 using a folding box making machine. After filling the food which is the content 10, the inner lid 3 provided with the front half cut 8, the back half cut 9, and the picking half cuts 12 and 12 is placed on the tray 4 with the inner lid inner surface resin 16 on the tray side. Then, the inner lid inner surface resin 16 and the tray inner surface resin 18 are overlapped and heat-sealed. The half cuts 8, 9, 12, and 12 are provided by a laser or a blade. The outer lid 2 coated with the outer lid adhesive varnish 14 on the inner surface is placed on the inner lid 3 and heat-sealed to integrate the tray 4, the inner lid 3 and the outer lid 2 to create a paper container 100. ..

FIG. 8 is a laminate that constitutes the sheet-like material that constitutes the outer lid paper 13, the inner lid paper 15, and the tray paper 17, respectively. The sheet-like material constituting the outer lid paper 13, the inner lid paper 15, and the tray paper 17, respectively, is composed of a laminate 300 in which at least a paper base material 301, an anchor layer 303, and a sealant layer 302 are laminated in this order, and each layer is formed. The materials of are as follows.

As the paper base material 301, various types of paperboard such as coated balls, coated Manila, and ivory can be used. Various types of printing may be applied to one or both sides of the paper base material for the purpose of improving the design and posting information.

The sealant layer 303 is composed mainly of homopolymer type polypropylene. This polypropylene has a melting point of at least 135 ° C. or higher so that it can sufficiently withstand the heat acting in the manufacturing process. The melting point is preferably 150 ° C. or higher. The thickness of the sealant layer 303 is 20 μm or more and less than 60 μm.

The anchor layer 302 enhances the adhesion between the paper base material 301 and the sealant layer 303. The material of the anchor layer 302 can be appropriately selected, but a material containing an acid-modified polypropylene resin aqueous dispersion as a main component is preferable. In this case, the polypropylene contained in the anchor layer 302 has a melting point of at least 120 ° C. or higher so as to sufficiently withstand the heat acting in the manufacturing process. The melting point is preferably 150 ° C. or higher.

When creating the laminate, the anchor layer 302 is applied to the paper base material 301, and the sealant layer 303 is extruded and laminated on the anchor layer 302.

<Second Embodiment>
The paper container 101 of the second embodiment is composed of an outer lid, an inner lid, and a tray like the paper container of the first embodiment, and the materials used for each are the same, but the inner lid is not a heart cut. The difference is that the perforations 30 that penetrate the surface are provided. Further, in the paper container 101 of the second embodiment, for example, frozen food is stored as the content 10, and the frozen food which is the content 10 is thawed by heating the paper container 101 together with the microwave oven to thaw the lid material 1. Can be eaten as it is after opening the container by peeling it from the tray 4.

FIG. 9A is a perspective view of the paper container 101 of the second embodiment of the present invention. 9 (b) is an enlarged cross-sectional view taken along the line GG of FIG. 9 (a).

The inner lid 3'is provided with a perforation 30 for opening so as to be inside the peripheral edge 6 of the opening 5 of the tray 4 along the peripheral edge, and the outer lid 2 covers the entire outer surface of the inner lid 3. It is peelably adhered to the inner lid 3'so as to cover it.

FIG. 10 is a sectional view taken along line HH of the tray 4 to which the grip portion 11'of the lid material 1'of FIG. 9A and the grip portion 11' are joined. The knob portion of the inner lid 3'is provided with two linear perforations extending toward the opening side as a perforation portion 31 for picking to peel off the entire knob portion of the inner lid 3'from the tray 4. .. FIG. 11 is a sectional view taken along line I-I of the tray 4 to which the grip portion 11'of the lid material 1'of FIG. 9A and the grip portion 11' are joined. The pinched portion of the inner lid 3'is peeled off from the tray 4 along the perforations 31 and 31 for picking, and opening is started when the perforations for opening 30 described above are peeled off.

As shown in FIG. 9A, the perforations 31 and 31 for picking and the perforations 30 for opening are connected to the perforations 30 for opening from the ends of the perforations 31 and 31 on the opening side. It is provided in.

(Method for Creating Paper Container 101 of Second Embodiment)
The method for creating the paper container 101 is as follows.
First, the sheet-shaped material is printed and punched to create a blank 200 for the tray 4. Next, the tray 4 is created from the blank 200 using a folding box making machine. After filling the food as the content 10, the inner lid 3'with the perforations 30 for opening and the perforations 31 and 31 for picking is placed on the tray 4 with the inner lid inner surface resin 15 on the tray side. The inner surface resin 16 of the lid and the inner surface resin 17 of the tray are overlapped and heat-sealed. The perforations 30 and 31 are provided by a laser or a blade. On the inner lid 3', the outer lid 2 coated with the outer lid adhesive varnish 14 is placed on the inner surface, heat-sealed, and the tray 4, the inner lid 3'and the outer lid 2 are integrated to form a paper container 101. create. The outer lid adhesive varnish 14 is applied only to the portion overlapping the outer peripheral edge of the inner lid 3', for example, so that the outer lid 2 is detachably adhered from the inner lid 3'. The outer lid adhesive varnish 14 is applied on the perforation 30 for opening the inner lid 3'so that the perforation 30 for opening the inner lid 3'is not blocked and the ease of opening the inner lid 3'is not impaired. It is preferable not to do so.

Since the perforations 30 and 31 (through holes) penetrating the inner lid 3'are covered with the outer lid 2 in this way, dust and dirt intrude into the contents 10 from the perforations 30 and 31 (through holes) that have penetrated. There is no fear.

(Method of opening the paper container 101 of the second embodiment)
When the outer lid 2 is peeled off from the inner lid 3'and then the pinched portion of the inner lid is pulled up, the inner lid is cut at the perforated portion and separated and opened, unlike the first embodiment. The thawed and warmed food is eaten with the paper container 101 as it is. As described above, the inner lid 3'has easy opening.

Since the inner lid 3'having such easy-opening property is sealed by the flange portion 7 of the tray 4, it is easy to open without requiring force. Further, since the strong outer lid 2 made of paper covers and protects the inner lid 3', it is strong against an external impact and the inner lid 3'provided with perforations 30 and 31 penetrating during transportation or the like is damaged. Can be prevented.

Using the paper containers of Examples 1 and 2 and Comparative Examples 1 to 3, the inventor of the present application confirmed the presence or absence of a through hole in the lid material, the strength of the lid material against an impact from the outside, and the openability of the lid material. Tests were conducted.

(Example 1)
As the paper container of Example 1, the paper container 100 of the above-described first embodiment was used. The sheet-like material constituting the outer lid paper 13, the inner lid paper 15, and the tray paper 17 is composed of a laminated body in which a paper base material, an anchor layer, and a sealant layer are laminated in this order, and the material of each layer is as follows. That's right.

As a paper base material, a base paper for a paper cup having a basis weight of 320 g / m ² was used. As the anchor layer, a polypropylene-based anchor agent (an acid-modified polypropylene resin aqueous dispersion having a polypropylene melting point of 150 ° C. or higher) was used. As the sealant layer, polypropylene (homopolypropylene, melting point 160 ° C., MFR20, density 0.9 g / cm ³ ) was used.

A polypropylene-based anchoring agent as the anchor layer was applied to the base paper for a paper cup as the paper base material, and polypropylene as the sealant layer was extruded and laminated on the polypropylene-based anchoring agent.

The structure of the lid material is as shown in FIG. 1 described above.

The method for creating the paper container is the same as the method for creating the paper container 100 according to the first embodiment described above.

The method of opening the paper container is the same as the method of opening the paper container 100 of the first embodiment described above.

(Example 2)
As the paper container of Example 2, the paper container 101 of the above-mentioned second embodiment was used. The sheet-like material constituting the outer lid paper 13, the inner lid paper 15, and the tray paper 17 is composed of a laminated body in which a paper base material, an anchor layer, and a sealant layer are laminated in this order, and the material of each layer is as follows. That's right.

As a paper base material, a base paper for a paper cup having a basis weight of 320 g / m ² was used. As the anchor layer, a polypropylene-based anchor agent (an acid-modified polypropylene resin aqueous dispersion having a polypropylene melting point of 150 ° C. or higher) was used. As the sealant layer, polypropylene (homopolypropylene, melting point 160 ° C., MFR20, density 0.9 g / cm ³ ) was used.

A polypropylene-based anchoring agent as the anchor layer was applied to the base paper for a paper cup as the paper base material, and polypropylene as the sealant layer was extruded and laminated on the polypropylene-based anchoring agent.

The structure of the lid material is as shown in FIG. 9 (b) described above.

The method for creating the paper container is the same as the method for creating the paper container 101 of the second embodiment described above.

The method of opening the paper container is the same as the method of opening the paper container 101 of the second embodiment described above.

(Comparative Example 1)
FIG. 12A is a perspective view of the paper container 102 of Comparative Example 1. 12 (b) is an enlarged sectional view taken along line JJ of FIG. 12 (a).

The paper container 102 of Comparative Example 1 used the same tray as the paper container 100 of the first embodiment, but the lid material has no outer lid unlike the first embodiment. Further, the easy-to-open sealant lid material 40 was used instead of the paper lid material. The easy-to-open sealant lid 40 includes a base film (PET) 41 and an easy-to-open sealant 42 laminated on the inner surface thereof. Further, the easy-open sealant lid material 40 has a knob portion 11 ″.

The sheet-like material constituting the tray paper is composed of a laminated body in which a paper base material, an anchor layer, and a sealant layer are laminated in this order, and the material of each layer is as follows.

As a paper base material, a base paper for a paper cup having a basis weight of 320 g / m ² was used. As the anchor layer, a polypropylene-based anchor agent (an acid-modified polypropylene resin aqueous dispersion having a polypropylene melting point of 150 ° C. or higher) was used. As the sealant layer, polypropylene (homopolypropylene, melting point 160 ° C., MFR20, density 0.9 g / cm ³ ) was used.

A polypropylene-based anchoring agent as the anchor layer was applied to the base paper for a paper cup as the paper base material, and polypropylene as the sealant layer was extruded and laminated on the polypropylene-based anchoring agent.

The method for producing the paper container 102 of Comparative Example 1 is as shown below.
First, the sheet-shaped material is printed and punched to create a blank for the tray 4. Next, the tray 4 is created from the blank using a folding box making machine. After filling the food as the contents, the easy-opening sealant lid 40 is placed on the tray 4 with the easy-opening sealant 42 on the tray side, and the easy-opening sealant 42 and the tray inner surface resin 18 are overlapped and heat-sealed. The manufacturing container 102 was created.

When opening the paper container 102 of Comparative Example 1, the knob portion 11'' of the easy-open sealant lid material 40 is pulled up and peeled off between the tray inner surface resin 18 and the easy-open sealant 42, or the easy-open sealant It is coagulated and broken in the 42 layers, peeled off, and opened.

(Comparative Example 2)
FIG. 13A is a perspective view of the paper container 103 of Comparative Example 2. 13 (b) is an enlarged cross-sectional view taken along the line KK of FIG. 13 (a).

The paper container 103 of Comparative Example 2 used the same tray 4 as the paper container 100 of the first embodiment, but the lid material 1 ″ had no outer lid unlike the first embodiment, and the lid material paper 43. And only the inner surface resin 44 of the lid material laminated on the inner surface thereof is provided. The lid material 1'' is provided with a back half cut 9 inside the peripheral edge 6 of the opening 5 of the tray 4, and a front half cut 8 is provided on the peripheral edge side of the opening from the back half cut 9. .. Further, the lid material 1 ″ has a knob portion 11 ″ ″.

The sheet-like material constituting the lid paper 43 and the tray paper 17, respectively, is composed of a laminated body in which a paper base material, an anchor layer, and a sealant layer are laminated in this order, and the materials for each layer are as follows.

As a paper base material, a base paper for a paper cup having a basis weight of 320 g / m ² was used. As the anchor layer, a polypropylene-based anchor agent (an acid-modified polypropylene resin aqueous dispersion having a polypropylene melting point of 150 ° C. or higher) was used. As the sealant layer, polypropylene (homopolypropylene, melting point 160 ° C., MFR20, density 0.9 g / cm ³ ) was used.

A polypropylene-based anchoring agent as the anchor layer was applied to the base paper for a paper cup as the paper base material, and polypropylene as the sealant layer was extruded and laminated on the polypropylene-based anchoring agent.

The method for producing the paper container 103 of Comparative Example 2 is as shown below.
First, the sheet-shaped material is printed and punched to create a blank for the tray 4. Next, a tray is created from the blank using a folding box making machine. After filling the food as the contents, the lid material 1'''with the front half cut 8 and the back half cut 9 is placed on the tray 4 with the lid material inner surface resin 44 on the tray side, and the lid material inner surface resin 44. And the resin 18 on the inner surface of the tray were overlapped and heat-sealed to prepare a paper container 103.

When opening the paper container 103 of Comparative Example 2, the knob portion 11 ′ ″ of the lid material 1 ″ is pulled up and separated into the front and back sides in the layer between the front and back half cuts 8 and 9 of the lid material 1 ″. , The lid material 1'' is peeled off from the tray 4 and opened.

(Comparative Example 3)
FIG. 14A is a perspective view of the paper container 104 of Comparative Example 3. 14 (b) is an enlarged sectional view taken along line LL of FIG. 14 (a).

The paper container 104 of Comparative Example 3 used the same tray 4 as the paper container 100 of the first embodiment, but the lid material 1'''has no outer lid unlike the first embodiment, and the lid material paper. Only 43 and the inner surface resin 44 of the lid material laminated on the inner surface thereof are provided. The lid material 1 ″ is provided with a perforation 30 penetrating along the peripheral edge inside the peripheral edge 6 of the opening 5 of the tray 4. Further, the lid material 1 "" has a knob portion 11 "".

The sheet-like material constituting the lid paper 43 and the tray paper 17, respectively, is composed of a laminated body in which a paper base material, an anchor layer, and a sealant layer are laminated in this order, and the materials for each layer are as follows.

As a paper base material, a base paper for a paper cup having a basis weight of 320 g / m ² was used. As the anchor layer, a polypropylene-based anchor agent (an acid-modified polypropylene resin aqueous dispersion having a polypropylene melting point of 150 ° C. or higher) was used. As the sealant layer, polypropylene (homopolypropylene, melting point 160 ° C., MFR20, density 0.9 g / cm ³ ) was used.

A polypropylene-based anchoring agent as the anchor layer was applied to the base paper for a paper cup as the paper base material, and polypropylene as the sealant layer was extruded and laminated on the polypropylene-based anchoring agent.

The method for producing the paper container 104 of Comparative Example 3 is as shown below.
First, the sheet-shaped material is printed and punched to create a blank for the tray 4. Next, the tray 4 is created from the blank using a folding box making machine. After filling the food as the content, the lid material 1'''with the perforated perforations 30 provided on the tray is placed on the tray side with the lid material inner surface resin 44 on the tray side, and the lid material inner surface resin 44 and the tray inner surface resin 18 are placed. A paper container 104 was prepared by superimposing and heat-sealing.

When opening the paper container 104 of Comparative Example 3, the knob portion 11'''' of the lid material 1'''' is pulled up, and the lid material 1'''' is cut at the perforation portion and separated and opened. ..

(Test method)
Regarding the test item "presence or absence of through holes in the lid material", the inner surface of each lid material (Example 1 and Example 2 are the inner lid inner surface resin surface, Comparative Example 1 is the easily open sealant surface, and the comparison with Comparative Example 2). In Example 3, the resin surface on the inner surface of the lid material) was wiped with a cotton cloth soaked with colored alcohol, and the presence or absence of through holes was confirmed by observing whether the alcohol permeated.

The test item "strength of the lid material against external impact" was confirmed by the "impact test" and "impact drilling strength".
The "impact test" was performed according to the "impact test" of JISZ1702, and the impact strength was measured by giving an impact to each paper container sealed with the lid material with a dirt impact tester. The total weight of the dirt was measured up to 1,200 g in the B method and the drop height was 1,000 mm, and the strength of the lid material of each paper container against an impact from the outside was compared.
The "impact drilling strength" conforms to the "impact drilling strength test method" of JISP8134. The impact strength (J) was measured by giving an impact to the lid material with an impact hole drilling strength tester in each paper container sealed with the lid material. Impact strength was measured up to 10J, and the strength of the lid material of each paper container against impact from the outside was compared.

The test item "openability of the lid material" was confirmed by the following method.
First, the tray was filled with the contents (spaghetti 300 g), and then each lid material was superposed on the tray. Next, the top surface of the lid material was heated by a sealing mold to seal the lid material on the tray. Next, it was heated in a household microwave oven at an output of 600 W for 5 minutes. Then, the picked portion of the lid material (the picked portion of the inner lid in Examples 1 and 2) is pulled up, the lid material (the inner lid in Examples 1 and 2) is peeled off from the tray, and the ease of opening is compared. did.

(Test results / discussion)
Table 1 shows the test results by the above test method.

Regarding "presence or absence of through holes in the lid material", "○" in Table 1 indicates that there is no possibility of intrusion of dust, etc., and "×" indicates that there is a possibility of intrusion of dust, etc. Is shown. In Example 1, there were no through holes in both the inner and outer lids, and in Example 2, there were through holes in the inner lid but not in the outer lid. Further, it was confirmed that Comparative Examples 1 and 2 had no through hole in the lid material, and Comparative Example 3 had a through hole in the lid material, and there was a possibility of dust or dust invading the through hole. .. From this result, when a perforation having a through hole is provided as in Example 2 and Comparative Example 3, there is a possibility that dust or dust may enter the through hole, but it is outside as in Example 2. It can be seen that if the inner lid provided with the perforations is protected by the lid, it is possible to prevent dust and dirt from entering the contents from the outside.

Regarding the "impact test", "○" in Table 1 indicates that the strength against an external impact is strong, and "x" indicates that the strength against an external impact is weak. Only in Comparative Example 1, the lid material was torn at a height of 350 mm, but in the other examples, it was not torn up to a height of 1,000 mm. From this result, the lid material using the easy-to-open sealant and not using paper as in Comparative Example 1 has a weak strength against the impact from the outside of the lid material, but the lid using paper as in the other examples. It can be seen that the material has high strength against an impact from the outside of the lid material.

Regarding "impact drilling strength", "○" in Table 1 indicates that the strength against external impact is strong, "△" indicates that the strength against external impact is relatively strong, and "×". Indicates that the strength against an external impact is weak. In Examples 1 and 2, the lid material was not torn until the impact of 10 J, but in Comparative Example 1, the lid material was torn by the impact of 2.8 J, and in Comparative Example 2 and Comparative Example 3, the impact of 8.0 J. The lid material did not tear until. From this result, the lid material using the easy-open sealant and not using paper as in Comparative Example 1 has the weakest strength against the impact from the outside of the lid material, and then as in Comparative Example 2 and Comparative Example 3. It can be seen that the lid material using paper but without the outer lid is weak, and the lid material using paper and protecting the inner lid with the outer lid as in Examples 1 and 2 is the strongest.

Regarding the "openability of the lid material", "○" in Table 1 indicates that the lid material is easy to open, and "x" indicates that the lid material is difficult to open. Only in Comparative Example 1, the easy-to-open sealant was severely peeled off and difficult to open, and in the other examples, it could be easily opened. From this result, it can be seen that it is easier to open the lid by using paper instead of the easy-open sealant.

As described above, the paper container of the present invention has a tray having a flange portion on the peripheral edge of the opening and a paper lid material joined to the flange portion, and the paper lid material is an inner lid. It has an outer lid, and the inner lid is provided with a back half-cut along the periphery inside the periphery of the opening and a front half-cut along the periphery on the periphery side of the opening from the back half-cut, or the opening. A perforation is provided inside the peripheral edge of the portion along the peripheral edge, and the outer cover is detachably adhered to the inner cover so as to cover the entire outer surface of the inner cover.
Therefore, the inner lid is separated into front and back in the layer between the front and back half cuts, and the inner lid is peeled off from the tray. Easy to open without the need for force. In addition, since the strong outer lid made of paper covers and protects the inner lid, there is no risk of dust and dirt entering the cuts in the inner lid, and it is also resistant to external impacts, making cuts during transportation. It is possible to prevent damage to the provided inner lid.

1, 1', 1'', 1'''... Paper lid 2 ... Outer lid 3, 3'... Inner lid 4 ... Tray 5 ... Opening 6 ...・ Periphery of opening 7 ・ ・ ・ Flange 8 ・ ・ ・ Front half cut for opening 9 ・ ・ ・ Back half cut for opening 10 ・ ・ ・ Contents 11, 11 ′, 11'', 11'''' , 11'''' ・ ・ ・ Picking part 11a ・ ・ ・ Picking part of outer lid 11b ・ ・ ・ Picking part of inner lid 12 ・ ・ ・ Half cut for picking 13 ・ ・ ・ Outer lid paper 14 ・ ・ ・ Outer lid Adhesive varnish 15 ... Inner lid paper 16 ... Inner lid inner surface resin 17 ... Tray paper 18 ... Tray inner surface resin 30 ... Perforations 31 ... Perforations for picking 40 ... Easy to open Sealant lid material 41 ... base film 42 ... easy-open sealant 43 ... lid material paper 44 ... lid material inner surface resin 51 ... bottom plate 52 ... side plate 53 ... edge piece 54 ... Folded joint plate 55 ... Joint edge piece 56 ... Tongue piece 57 ... Second side plate 58 ... Second edge piece 59 ... Second tongue piece 60 ... Second Folded joint plate 61 ... Small protrusions 100, 101, 102, 103.104 ... Paper container 200 ... Blank 300 ... Laminated body 301 constituting a sheet-like material ... Paper base material 302 ... Sealant layer 303 ... Anchor layer

Claims (3)

It has a tray with a flange on the periphery of the opening and a paper lid joined to the flange.
The paper lid material has an inner lid and an outer lid, and has an inner lid and an outer lid.
The inner lid is provided with a back half cut along the peripheral edge inside the peripheral edge of the opening, and a front half cut is provided along the peripheral edge on the peripheral edge side of the opening from the back half cut.
The outer lid is detachably adhered to the inner lid so as to cover the entire outer surface of the inner lid.
A paper container characterized by that. It has a tray with a flange on the periphery of the opening and a paper lid joined to the flange.
The paper lid material has an inner lid and an outer lid, and has an inner lid and an outer lid.
The inner lid is provided with a perforation that penetrates along the peripheral edge inside the peripheral edge of the opening.
The outer lid is detachably adhered to the inner lid so as to cover the entire outer surface of the inner lid.
A paper container characterized by that. The paper container according to claim 1 or 2, wherein the lid material is provided with a knob.

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