JP2010143583A - Sealable container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealable container which is not broken by an external force during physical distribution and handling, while a straw insertion hole can be easily formed during the use and a straw insertion hole part is sanitary. <P>SOLUTION: The sealable container has a heat-bonded part in which a lid material with a base material layer, an intermediate layer and a heat-bonding resin layer successively layered covers an opening by making a heat-bonding resin layer surface oppose a mouth edge of the opening of a container body having the opening, and is heat-bonded. The lid material has a knob which is outwardly projected from a peripheral edge, a side opposite to the intermediate layer of the heat-bonding resin layer is formed of at least a polypropylene resin, and the intermediate layer and the heat-bonding resin layer are layered so as to be peelable between the polypropylene resin and a polyethylene resin layer via a polyethylene resin layer. A half-cut for forming a straw insertion hole is formed in the heat-bonding resin layer, and one or a plurality of half-cuts for starting unsealing are formed in the vicinity of the knob. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cup-shaped sealed container in which an opening of a container filled with a liquid beverage such as milk beverage, juice, coffee, cocoa, tea, etc. is sealed with a lid material, and in particular, the formation of a straw insertion hole is easy. This relates to a sealed container.

As a sealed container that circulates a container body filled with a liquid beverage such as milk drink, juice, coffee, cocoa, tea, etc. with a lid material, for example, biaxially 4 to 9 μm thick on the upper and lower surfaces of paper A stretched polyester film is laminated, and a lid formed by providing a heat seal layer of a thermoplastic resin on the lower surface of the biaxially stretched polyester film on the lower surface side is heat-sealed at the opening of the beverage-containing synthetic resin container. A sealed container in which a synthetic resin cover having a straw piercing cut is placed on the upper side of a synthetic resin container is widely used (see, for example, Patent Document 1). Since the sealed container is covered with a synthetic resin cover, it is possible to prevent external force from being directly applied to the lid during distribution and handling, and to prevent dust from adhering to the lid. However, it is necessary for a manufacturer of beverages or the like to arrange a cover made of synthetic resin in addition to the container body and the lid material, which increases the troublesomeness in terms of management and increases the process of covering the cover. . On the other hand, there is a problem on the consumer side that the cover must be separated after use and discarded.
In addition, a sealed container is also known that is used by sealing the opening of the container body with an easily pierceable lid member and piercing a straw into the easily pierceable lid member during use (see, for example, Patent Documents 2 and 3). Since the sealed container is not provided with a synthetic resin cover as in Patent Document 1, it is highly convenient for the manufacturer and the consumer. There is a problem that it has micro holes and is exposed to the outer surface, so it is easy to break when impact or external force is applied during distribution or handling, or it is unsanitary because the straw pierced part directly touches the outside is there.
Utility Model Registration No. 2594337 Japanese Patent Laid-Open No. 7-217069 JP-A-8-147552

  In view of the above-mentioned conventional problems, the present invention is not damaged by external force during distribution and handling, and can be easily formed with a straw insertion hole during use. It is to provide.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is directed to a container body having an opening with a lid formed by sequentially laminating a base material layer, an intermediate layer, and a thermoadhesive resin layer. A sealed container having a heat-bonded portion that covers and heat-bonds the heat-adhesive resin layer surface to the lip of the opening, and the lid material is outward on the periphery. The side facing the intermediate layer of the thermal adhesive resin layer is at least a polypropylene resin, and the intermediate layer and the thermal adhesive resin layer are connected to the polypropylene resin via a polyethylene resin layer. It consists of the structure laminated | stacked so that peeling between the said polyethylene resin layers, The half cut for straw insertion hole formation is formed in the said thermoadhesive resin layer, and it is for the opening start of one place or multiple places near the said knob | pick part Half cut formed A sealed container, characterized in that is.

  The present invention according to claim 2 is the sealed container according to claim 1, wherein the thermoadhesive resin layer of the lid is made of unstretched polypropylene resin, and the lid of the container body The opposing side is a polypropylene resin.

  In the sealed container of the present invention, a lid member formed by sequentially laminating a base material layer, an intermediate layer, and a heat-adhesive resin layer is provided on the mouth portion of the opening of the container body having the opening. A sealed container having a heat-bonded portion that is heat-bonded by covering the opening with the surface of the heat-adhesive resin layer facing, wherein the lid member has a knob portion protruding outward at the periphery, and the heat The side of the adhesive resin layer facing the intermediate layer is at least a polypropylene resin, and the intermediate layer and the thermal adhesive resin layer are detachably laminated between the polypropylene resin and the polyethylene resin layer via a polyethylene resin layer. It has a configuration, and the thermo-adhesive resin layer is formed with a half cut for forming a straw insertion hole, and one or more opening start half cuts are formed in the vicinity of the knob. By By pulling up the part, the heat-adhesive resin layer is easily peeled between the polypropylene resin layer and the polyethylene resin layer, and a straw insertion hole is formed in the heat-adhesive resin layer so that the straw can be inserted from the outer surface of the heat-adhesive resin layer. It becomes possible.

  Also, the half cut part for forming the straw insertion hole is protected from external force because the base material layer and the intermediate layer are laminated, and the lid material may be damaged even if impact or external force is applied during distribution and handling. There is no. Further, a synthetic resin cover is not required, and process management becomes easy. Furthermore, since the half cut portion for forming the straw insertion hole is not in direct contact with the outside until the straw insertion hole is formed in use, it has the effect of being hygienic.

  In addition, a sealed container having excellent heat resistance by the configuration in which the thermoadhesive resin layer of the lid is made of unstretched polypropylene resin and the side of the container body facing the lid is made of polypropylene resin. can do.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of a sealed container according to the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. 3 is a thermoadhesive resin for a lid used in the sealed container according to the present invention. FIG. 4 is a cross-sectional view showing a state in which a straw insertion hole of an embodiment of a sealed container according to the present invention is formed. In the figure, reference numeral 1 is a sealed container, 10 is a container body, 11 is an opening, 12 is a lip, 13 is a bottom, 20 is a lid, 20a is a lid piece, 21 is a base material layer, and 22 is an intermediate layer. , 23 is a polyethylene resin layer, 24 is a heat-adhesive resin layer, 24a is a straw insertion hole, 25 is a knob, 26 is a half-cut for opening the opening, 27 is a half-cut for forming a straw insertion hole, and 28 is a heat-bonding part. The planned portion 30 indicates a thermal bonding portion.

  As shown in FIGS. 1 and 2, a sealed container according to an embodiment of the present invention is, for example, a container having a circular cross section that includes an opening 11 at the top and a bottom 13 at the bottom and expands upward. This is a sealed container 1 in which a lid material 20 is placed on the lip 12 of the opening 11 of the main body 10 to cover the opening 11 and thermally bonded by the heat bonding part 30.

  The lid member 20 has a configuration in which a base material layer 21, an intermediate layer 22, and a thermal adhesive resin layer 24 are sequentially laminated, and the surface of the thermal adhesive resin layer 24 is the edge of the opening 11. It is thermally bonded so as to face 12. Further, the lid 20 has at least a polypropylene resin on the side where the heat-adhesive resin layer 24 faces the intermediate layer 22, and the intermediate layer 22 and the heat-adhesive resin layer 24 are laminated via a polyethylene resin layer 23. It is the structure laminated | stacked so that peeling was possible between the polypropylene resin of the adhesive resin layer 24, and the polyethylene resin layer 23. FIG.

  In addition, as shown in FIG. 1, the circular lid member 20 has a knob 25 protruding outward at the periphery in order to facilitate opening. As shown in FIG. 2, a plurality of opening start half cuts 26 are formed in the thermoadhesive resin layer 24 in the vicinity of the knob 25. As shown in FIG. 3, the opening-start half-cut 26 has at least one pinch portion from a position 2 mm away from the pinch portion 25 side with the point of contact with the pinch portion 25 side of the thermal bonding portion formation scheduled portion 28 as a middle point. It is preferable to form it in a range 2 mm away from the side 25 (hereinafter referred to as the optimum range) because it is easy to start peeling between the polyethylene resin layer 23 and the thermoadhesive resin layer 24. Further, the half-cut 26 for opening the opening may be a curved line, but the straight line substantially orthogonal to the opening direction (indicated by the arrow in FIG. 3) is between the polyethylene resin layer 23 and the thermoadhesive resin layer 24. Is preferable because peeling is easy. Further, it is preferable to provide a plurality of opening start half cuts 26 because the lid member 20 can be easily peeled off even if the lid member 20 and the mouth edge 12 of the container body 10 are misaligned. Moreover, when forming in multiple places, it is good to form at intervals of 0.5-2.0 mm. In addition, when making the half cut 26 for opening start into one place, it is important to form in the said optimal range.

  Further, the lid member 20 has a straw insertion hole forming half on the surface of the heat-adhesive resin layer 24 facing the opening 11 of the container body 10 in the region surrounded by the heat-bonding-part forming scheduled portion 28. A cut 27 is formed.

  The opening start half cut 26 and the straw insertion hole forming half cut 27 are preferably formed so as to penetrate the heat-adhesive resin layer 24 and reach the polyethylene resin layer. However, when the intermediate layer 22 is reached, particularly in the case of an intermediate layer having a barrier property, the barrier property is lowered, so care must be taken.

  The lid material 20 is obtained by sandwiching and laminating a polyethylene resin obtained by extruding an intermediate layer 22 and a heat-adhesive resin layer 24 by hot-melting using a laminator through a polyethylene resin layer 23 formed by a die. 23 and the heat-adhesive resin layer 24 are detachably laminated. The delamination strength between the polyethylene resin layer 23 and the thermal adhesive resin layer 24 is preferably in the range of 0.1 to 1.0 N / 15 mm width because delamination is easy. The delamination strength within the above range can be easily obtained by making the side of the thermal adhesive resin layer 24 facing the intermediate layer 22 a resin layer made of at least a polypropylene resin. Further, the thermal adhesive strength between the thermal adhesive resin layer 24 of the lid member 20 and the lip portion 12 of the container body 10 is preferably 3.0 N / 15 mm width or more, and more preferably 5.0 N / 15 mm width or more. The resin on the thermal adhesive resin layer 24 on the side to be thermally bonded to the rim portion 12 of the container main body 10 is appropriately selected depending on the material of the container main body 10 so as to obtain the above-mentioned thermal adhesive strength. The peel strength and thermal bond strength in the present invention are indicated by measured values obtained by T-shaped peel.

  Next, a straw insertion hole forming method according to an embodiment of the sealed container of the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing a state where a straw insertion hole of an embodiment of the sealed container according to the present invention is formed. By picking and pulling the knob 25 of the lid member 20 of the sealed container 1 shown in FIG. 2 with a finger, as shown in FIG. 4, peeling starts from the opening half-cut 26 of the lid member 20, When the delamination occurs between the thermal adhesive resin layer 24 and the polyethylene resin layer 23 and the straw insertion hole forming half cut 27 is reached, the portion of the thermal adhesive resin layer surrounded by the straw insertion hole forming half cut 27 is formed. A straw insertion hole 24a is formed in the heat-adhesive resin layer 24, which is integrally lifted with the polyethylene resin layer 23 and is thermally bonded to the lip portion 12.

  It is possible to eat and drink by inserting a straw from the outer surface of the straw insertion hole 24a formed in the thermal adhesive resin layer 24. The lid member piece 20a formed by delamination between the thermal adhesive resin layer 24 and the polyethylene resin layer 23 of the lid member 20 is peeled off as it is and removed from the sealed container 1 or when the straw insertion hole 24a is formed. It may be folded. In this way, until opening, the opening start half cut 26 and the straw insertion hole forming half cut 27 are protected by the base material layer 21 and the intermediate layer 22, so that an impact or an external force is applied during distribution or handling. Even if it exists, the cover material 20 is not damaged. Further, the straw insertion hole forming half cut 27 portion is hygienic because it does not directly touch the outside until the straw insertion hole 24a is formed.

  Next, the material used for the sealed container 1 of the present invention will be described. The container body 10 can be used as long as it has a structure having an opening 11 at the top, a mouth edge 12 at the periphery thereof, and a bottom 13 at the bottom, and the shape is not limited. An injection molded product of a thermoplastic resin such as polypropylene, polyethylene, polyester, or polystyrene, or a sheet molded product obtained by vacuum molding or pressure molding of the thermoplastic resin sheet can be used. Further, an in-mold molded product obtained by in-mold molding using paper, metal foil, plastic, or a composite material combining them can also be used.

  The base material layer 21 of the lid member 20 is made of paper such as coated paper, high-quality paper, craft paper, unstretched or biaxially stretched films made of resin such as polypropylene, polyamide, and polyester, or oxidized to these films. A film obtained by depositing an inorganic oxide such as aluminum or silicon oxide, or a film obtained by coating or coextruding a barrier resin such as polyvinyl alcohol or vinylidene chloride on these films can be used. The thickness of the base material layer 21 is usually about 6 to 50 μm.

  For the intermediate layer 22, metal foil such as paper, film, and aluminum foil used for the base material layer 21 can be used. Moreover, a composite material obtained by combining and laminating these can be used, and may be determined as appropriate depending on the packaging purpose, the type of contents, the filling of contents, and the like. Further, the film may be colored by adding a pigment such as titanium oxide or carbon black. The thickness of the intermediate layer 22 is about 9 to 100 μm.

The thermal adhesive resin layer 24 may have a polypropylene resin layer on the polyethylene resin layer 23 side, and a single layer or a composite film such as coextrusion can be used. For example, if the side of the container body 10 facing the lid member 20 is polypropylene, a single layer of polypropylene or a coextruded film of polypropylene and an easily peelable heat-adhesive resin can be used. The easily peelable thermoadhesive resin is, of course, thermally bonded to polypropylene, but refers to a resin whose thermal adhesive strength is controlled by mixing, for example, a polypropylene resin with a resin having poor compatibility with the polypropylene resin.
A resin layer that can be thermally bonded according to the material of the container body 10 can be used on the container body 10 side of the heat-adhesive resin layer 24. Specifically, if the side of the container body 10 facing the lid member 20 is polystyrene, for example, an easily peelable thermoadhesive resin in which polystyrene and a resin such as polypropylene and polyethylene that are not thermally bonded to polystyrene are mixed with polypropylene. Can be used. The heat-adhesive resin layer 24 can also be laminated by extrusion lamination on the surface of the polyethylene resin layer 23 by hot-melt extrusion.

  For the polyethylene resin layer 23, low density polyethylene, medium density polyethylene, high density polyethylene, and linear polyethylene can be used. Furthermore, resins such as ethylene / vinyl acetate copolymer, ionomer, acid-modified polyethylene can be used, and they can be formed by an extrusion lamination method. In the present invention, the polyethylene resin layer includes a copolymer with ethylene and modified polyethylene in addition to polyethylene and is used in a broad sense.

Specific examples of the structure of the lid member 20 include: (1) biaxially stretched polyester film (PET) / printing / silicon oxide vapor deposition PET / polyethylene resin layer (PE) / unstretched polypropylene film (CPP) or polypropylene (PP) Easy peelable thermal adhesive resin (EPR) co-pressed film (PP-EPR)
(2) Biaxially stretched nylon film (ON) / printing / aluminum oxide vapor deposited PET / polyethylene resin layer (PE) / unstretched polypropylene film (CPP) or PP-EPR
(3) ON / printing / paper / aluminum deposition PET / polyethylene resin layer (PE) / unstretched polypropylene film (CPP) or PP-EPR
(4) Biaxially stretched polyester film (PET) / printing / biaxially stretched polypropylene (OPP) / aluminum foil (AL) / polyethylene resin layer (PE) / unstretched polypropylene film (CPP) or PP-EPR

  Next, the present invention will be described in more detail with reference to the following examples.

  The substrate layer is printed on one side using 12 μm thick biaxially stretched polyethylene terephthalate (PET), and the intermediate layer is 30 μm thick milk white biaxially stretched polypropylene (WOPP) and 7 μm thick aluminum foil (AL). Was laminated by a dry lamination method (DL) using a polyester polyol-isocyanate adhesive, and an intermediate laminate of PET 12 μm / printing / DL / WOPP 30 μm / DL / AL 7 μm was prepared. Further, an unstretched polypropylene film (CPP) coated with an isocyanate anchor coating agent (AC) on the aluminum foil (AL) surface and subjected to a single-side corona treatment with a thickness of 30 μm on the heat-adhesive resin layer is used for AC of the intermediate laminate. The surface and the corona-treated surface of CPP are extruded and heat-melted low-density polyethylene (PE) by a lamination method to form a polyethylene resin layer having a thickness of 20 μm, and sandwich lamination is performed. A laminate of a cover material having a configuration of AC / PE 20 μm / CPP 30 μm was produced.

  Next, using a punching machine having a predetermined half-cut for opening opening and a half-cut for forming a straw insertion hole, the thermal adhesive resin layer is aligned with printing at a predetermined position of the laminate of the lid material. Predetermined opening half-cuts and straw insertion hole forming half-cuts that penetrate the CPP from the (CPP) surface and reach the PE layer were formed. Thereafter, the lid member 20 shown in FIG. 3 having a knob was punched into a predetermined shape.

  The container body is filled with 300 ml of 90 ° C. coffee using the PP injection-molded product shown in FIG. 2, and the lid prepared above is covered with the opening of the container body and stacked on the lip, and thermally bonded. And sealed.

  The obtained sealed container was used as a test sample, and the openability and impact resistance (drop test) were evaluated by the following methods. The results are shown in Table 1.

[Evaluation method and evaluation criteria]
(1) Opening property By peeling the picking part of the lid material of the test sample with a finger and pulling it up, peeling starts from the half-cut for opening the lid material as a starting point, and CPP and polyethylene resin which are heat-adhesive resin layers A layer with a straw insertion hole formed in a heat-adhesive resin layer that is easily delaminated with PE as the layer and thermally bonded to the lip, and was difficult to open without peeling Was marked with x.
(2) Drop test To accommodate 12 test samples in 3 rows and 4 surfaces and 1 step on A-side double-sided corrugated cardboard (exterior corrugated cardboard conforming to JIS Z 1516). Packed with cardboard dividers. Thereafter, the cardboard case packed with the sample to be tested was continuously grown in an atmosphere at a room temperature of 10 ° C. from a height of 60 cm so that a total of 7 points of 3 sides, 3 ridges and 1 corner of the corrugated cardboard contact the floor surface first. I fell down. The case where defects such as breakage did not occur in the lid material was marked with ◯, and the case where the defects occurred was marked with ×.
The openability was evaluated before and after the drop test.

  The CPP of 30 μm of the heat-adhesive resin layer of the lid material of Example 1 was changed to 30 μm of PP-EPR (manufactured by J Film Co., Ltd .: SMX PY3000). Otherwise, it was the same as Example 1. The results are shown in Table 1.

[Comparative Example 1]
The substrate layer is printed on one side using a biaxially stretched polyethylene terephthalate (PET) having a thickness of 12 μm, the isocyanate anchor coating agent (AC) is applied on the printed surface, and the heat-adhesive resin layer is 30 μm in thickness. A single-sided corona-treated unstretched polypropylene film (CPP) is used to extrude the AC surface and CPP corona-treated surface, and a low-density polyethylene (PE) is thermally melted by a lamination method to form a polyethylene resin layer having a thickness of 20 μm. Lamination was performed to produce a laminate of a lid material having a structure of PET 12 μm / printing / AC / PE 20 μm / CPP 30 μm.
Others were the same as in Example 1. The results are shown in Table 1.

  As can be seen from Table 1, Examples 1 and 2 of the present invention have good openability both before and after the drop test, and easily peeled between the polyethylene resin layer and the heat-adhesive resin layer from the half-cut for opening start. The straw insertion hole could be easily formed in the heat-adhesive resin layer thermally bonded to the rim of the container body. In the drop test, the lid of the sealed container was not broken and was good. In Comparative Example 1, the unsealing property was good both before and after the drop test, but in the drop test, the lid material was partially damaged and some coffee leakage occurred.

It is a top view which shows one Embodiment of the sealed container which concerns on this invention. It is the XX sectional view taken on the line of FIG. It is the top view seen from the heat adhesive resin layer side of the lid | cover material used for the sealed container which concerns on this invention. It is sectional drawing which shows the state which formed the straw insertion hole of one Embodiment of the sealed container which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing container 10 Container main body 11 Opening part 12 Mouth part 13 Bottom part 20 Lid material 20a Lid material piece 21 Base material layer 22 Intermediate | middle layer 23 Polyethylene resin layer 24 Thermal-adhesive resin layer 24a Straw insertion hole 25 Picking part 26 For opening opening Half cut 27 Straw insertion hole forming half cut 28 Thermal bonding part formation scheduled part 30 Thermal bonding part

Claims (2)

A lid formed by sequentially laminating a base material layer, an intermediate layer, and a heat-adhesive resin layer is opposed to the mouth portion of the opening of the container body having the opening with the surface of the heat-adhesive resin layer facing A sealed container having a heat-bonded portion that covers the opening and is heat-bonded, wherein the lid member has a knob protruding outward at the periphery, and the intermediate portion of the heat-adhesive resin layer The side facing the layer is at least a polypropylene resin, and the intermediate layer and the thermoadhesive resin layer are configured to be peeled and laminated between the polypropylene resin and the polyethylene resin layer via a polyethylene resin layer, and the thermal bonding A sealed container, wherein a half cut for forming a straw insertion hole is formed in the conductive resin layer, and one or a plurality of opening start half cuts are formed in the vicinity of the knob. 2. The sealed container according to claim 1, wherein the thermoadhesive resin layer of the lid is made of unstretched polypropylene resin, and a side of the container body facing the lid is made of polypropylene resin.

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