JP2009280283A - Lid with barrier property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid with a barrier property which is remarkably excellent in the barrier property, a stable sealing property to a cup and an easy unsealability as compared to a conventional one and makes unsealing more intelligible. <P>SOLUTION: The lid comprises a lower layer 4A comprising an innermost layer 7 having a polyethylene sealant layer 8 at least at the lowest layer and a metal foil layer 10 and an upper layer 4B which is peelable from the lower layer 4A. A plurality of lines of weak strength sections 13 are arranged at least at the innermost layer 7 of the lower layer 4A. The upper layer 4B is peelably separated from the lower layer 4A, and in use the lower layer 4A is torn at the weak strength sections 13 so as to facilitate unsealing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lid composed of a laminate of a metal foil and a plastic sheet, for example, sealed in an opening of a paper cup. More specifically, the present invention relates to a lid that can be sealed and sealed in a paper cup, can maintain a barrier property, and can be easily opened by being pushed.

  Many lids that can be opened by tearing have been proposed, for example, which are opened by piercing them with a straw. There have also been many proposals to provide perforations by providing perforations, break lines, and cut lines.

By the way, in general, the lid of the paper cup is designed so that the innermost sealing layer of the lid is thick and the step is filled so that the flange of the paper cup and the step of the curl can be sealed when sealed. In the paper cup, rectangular paper is wound into a cylindrical or fan-shaped paper in an inverted frustoconical shape, and ends thereof are overlapped to use the overlapping portion as a glue margin. Therefore, when there is a flange or a curl in the opening, a step is generated in this overlapping portion, and there is a problem from the viewpoint of maintaining airtightness. In order to solve this problem, the lowermost resin layer of the lid is made thick so as to maintain airtightness.
Furthermore, the lid for a paper cup often has hot melt as the innermost layer.

  However, the conventional lids that are pierced and broken with a straw do not have a structure that can be opened largely, and depending on how they are torn, lid fragments may be generated, leading to unexpected situations such as accidental ingestion. There is. Further, when the innermost resin layer is made thick so that the flange of the cup and the step of the curl are filled, it is difficult to tear and open due to the thickness. Furthermore, when hot melt is used, there is a risk of problems in hot melt cleanability (hot melt wrinkles occur). In addition, when exposed to high temperatures, it melts and opens carelessly, and the odor peculiar to hot melt deteriorates the commercial value.

  The present invention has been made to solve such a problem, and has a barrier property, a stable sealing property for a cup, and further an easy opening property, which makes the opening easier to understand. It aims at providing the lid | cover which has barrier property.

  In order to solve the above technical problem, the lid having a barrier property according to claim 1 of the present invention comprises a lower layer portion comprising an innermost layer having a polyethylene sealant layer at least as a lowermost layer and a metal foil layer, and It consists of an upper layer part that can be peeled off from this lower layer part, the innermost layer of the lower layer part is provided with a plurality of strength weak points, and can be separated by peeling the upper layer part from the lower layer part, When used, the lower layer portion is broken by the strength weak point portion, and is easy to open.

  In the lid having such a barrier property, the barrier property is well secured by the metal foil layer. The strength weak point portion provided radially in the innermost layer is easily divided into a plurality of fan shapes from the center to the periphery along the strength weak point portion and is pushed through when the external pressure to push it is loaded. . Further, since this innermost layer has a polyethylene sealant layer, when it is used for a paper cup or the like, airtightness is realized by filling a step formed in the flange or curled portion. Furthermore, since a hot melt is not employed, melting does not occur even when exposed to high temperatures, and there is no specific odor.

  And in the present invention, the upper layer part laminated and bonded through the bonding of the release agent layer or the different resin film using the adhesive varnish or easy peel film applied to the outer side of the lower layer part in a peeling varnish or pattern, Works to protect the lower layer. Further, prior to the work of pushing and tearing the lid by the strength weak point part, the peeling sound generated by peeling off the upper layer part contributes to imparting virginity.

Therefore, this invention has the following effects.
The lid having the barrier property of the present invention can sufficiently ensure airtightness by the upper metal foil layer. In addition, it can be easily pushed through by providing a weak point portion such as a perforation or a cut line in at least the innermost layer of the lower layer. Moreover, the possibility of generating broken pieces of the lid can be solved well. Moreover, since the innermost layer of the lower layer portion has a polyethylene sealant layer, it can be well sealed regardless of the presence of a step on the flange or curl portion of the cup, and sufficient airtightness can be secured. Furthermore, since a hot melt is not employed, a stable sealing property can be obtained, and the influence of odor can be eliminated.

  In particular, in the present invention, the upper layer portion is laminated and adhered to the outside of the lower layer portion through bonding of a release agent layer or a different resin film. As a result, the lower layer portion, particularly the strength weak point portion, is securely protected from external impacts and pressing forces, for example, impacts during transportation, regardless of the lid having the strength weak point portion inside. Therefore, it is possible to prevent an unexpected situation where the lower layer portion is easily opened, and to provide a highly safe lid. In addition, when the upper layer portion is peeled off before the operation of pushing the lid off by the strength weak point portion, a light peeling sound is generated, so that the virgin property is strongly impressed.

  In the present invention, at least one of a metal foil layer, a synthetic resin layer, and further a paper layer is laminated on an innermost layer having a polyethylene sealant layer in at least the lowermost layer. A lower layer composed of a laminated body, a metal foil layer, a synthetic resin layer, and a laminate in which at least one of paper layers is laminated, and a release layer on the outside of the lower layer The upper layer portion is provided with a plurality of strength weak points in the lower layer portion, and the upper layer portion can be separated from the lower layer portion through the release layer. The lower layer portion is broken by the strength weak point portion, and can be easily opened.

  Furthermore, the present invention provides, as described in claim 3, a lower layer portion in which a metal foil layer is bonded via an adhesive layer on an innermost layer having a polyethylene sealant layer in at least the lowermost layer, It consists of an upper layer mainly composed of paper laminated on the outside of the lower layer metal foil layer via a release layer, and the innermost layer of the lower layer is provided with a plurality of strength weak points radially from the center. The upper layer portion can be separated from the release layer, and the metal foil layer including the innermost layer of the lower layer portion can be broken by the strength weak point portion during use, and can be easily opened.

  In the second and third aspects of the invention, a more desirable lid is obtained in which the strength weak point portion of the lower layer is not inadvertently broken against an external force applied during physical distribution.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, showing an embodiment of the lid having barrier properties of the present invention. It is a bottom view of the lid | cover of FIG. FIG. 2 is an overall exploded perspective view including an enlarged view in which a part of a container to which the lid having a barrier property in FIG. 1 is applied is taken out and enlarged. It is sectional drawing of the end of a container when the container of FIG. 3 is closed. It is explanatory drawing of an effect | action of the lid | cover which has the barrier property of FIG. 1, and is a perspective view which shows the relationship between the lid | cover, a container, and a jar before replenishing the contents to a jar. It is explanatory drawing of an effect | action of the lid | cover shown in FIG. 5, and is sectional drawing of the principal part. It is explanatory drawing of an effect | action of the lid | cover which has the barrier property of FIG. 1, and is a perspective view which shows the relationship between the lid | cover in the middle of replenishing the contents to a jar, a container, and a jar. It is explanatory drawing of an effect | action of the lid | cover shown in FIG. 7, and is sectional drawing of the principal part. It is a bottom view of the lid corresponding to Drawing 2 at the time of making a strength weak point part into six. FIG. 12 is a cross-sectional view taken along line AA in FIG. 11, showing the configuration of the lid shown in Example 2. It is a bottom view of the lid | cover of FIG. FIG. 11 is a cross-sectional view illustrating the configuration of Example 3 and corresponding to FIG. It is sectional drawing corresponding to FIG. 12 which shows a comparative example.

Hereinafter, an embodiment in which the lid having barrier properties of the present invention is applied to an instant coffee refilling container 1 will be described in detail with reference to the drawings.
The present invention is basically applicable to all types of lids that have a barrier property sealed to a paper cup and are opened by breaking the lid. Therefore, it goes without saying that the present invention is not limited to the structures described in the following embodiments.

  First, as shown in FIGS. 3 and 4, the refilling container 1 includes a container body 2, a hopper 3, a lid 4 having a barrier property, and a protective cap 5.

  The container body 2 has a bottomed cylindrical shape, and a rectangular piece of paper is used as the base material. This paper cylinder is produced from a composite laminate sheet in which paper, polyethylene, aluminum foil, polyethylene terephthalate, and polyethylene are laminated in order from the outermost layer to the inside. This is to completely block moisture and ventilation. This is because the polyethylene resin on the inner surface ensures adhesion to the lid 4. A known technique is adopted as the processing means. For example, it is a general method such as laminating or coating. In order to create the container body 2, the rectangular paper piece that has been surface-treated as described above is rounded into a cylindrical shape, the left and right sides are polymerized, and this overlapped portion is used as an adhesive to bond appropriately. As the bonding means, an adhesive is used, heat-sealing, or a known means is appropriately employed. As shown in FIGS. 3 and 4, the upper end is formed with an annular winding portion (hereinafter simply referred to as a curled portion) 6 that is annularly wound outward. Therefore, a step 6A is inevitably generated in the vertical direction in the overlapping portion on both sides of the upper surface of the curled portion 6. Since the step 6A impairs hermeticity, the cleanup is important.

  A cylindrical hopper 3 is fitted into the opening 2A of the container body 2 as shown in FIG. The hopper 3 is made of the same material as the container body 2 or an appropriate resin material such as high density polyethylene (HDPE) or polypropylene whose thickness is set to 0.8 mm. The hopper 3 is provided with a straight rising wall 3 </ b> A around the upper end without an outward flange. The rising wall 3A is fitted into the opening 2A with its upper end positioned at the same height as the upper end of the opening 2A of the container body 2, that is, the upper end surface 6B of the curled part 6. In addition, a funnel 3B that is integrally inclined from the lower end edge of the rising wall 3A to the upper side and toward the center is provided. The taper angle of the funnel 3B is set to at least 20 °, more preferably 40 to 45 °.

  The upper end of the funnel 3B of the hopper 3 is positioned at substantially the same height as the upper end of the rising wall 3A and the opening 2A of the container body 2, and is fitted into the opening 2A. That is, they are aligned so that they can be arranged on substantially the same plane. After the hopper 3 is fitted, the hopper 3 is appropriately fixed to the inner peripheral surface of the opening 2A. As the fixing means, the most preferable means such as heat fusion, high frequency welding, use of an adhesive or the like is appropriately adopted.

The upper end of the hopper 3 is sealed with a lid 4 having a barrier property.
As shown in FIG. 1, the lid 4 having a barrier property is composed of a composite sheet in which a lower layer portion 4A and an upper layer portion 4B are laminated with a release agent layer (described later) for detachably bonding them.
First, the lower layer portion 4A includes an innermost layer 7 made of a resin layer including a polyethylene sealant layer 8, and a metal foil layer 10 attached to the outer side of the resin layer of the innermost layer 7 via an adhesive layer (described later). Composed. The outer layer 11 that is the upper layer portion 4B is mainly composed of paper. And the said upper layer part 4B is stuck on the outer side of the said metal foil layer 10 of the said lower layer part 4A through the peeling agent layer 18 (after-mentioned), and is comprised. In addition, the innermost layer 7 is provided with a plurality of strength weak points 13 radially from the center thereof, and the metal foil layer 10 including the inner layer 7 is easily broken by the strength weak points 13, It is easy to open.

The above configuration will be described in more detail.
The innermost layer 7 is a sealant layer 8 of polyethylene (linear low density polyethylene: LLDPE) having a lowermost layer of 40 μm. Then, 12 μm of polyethylene terephthalate (PET) 9 is laminated on the upper surface of the polyethylene sealant layer 8 through an extruded resin film 12 of 20 μm of polyethylene (low density polyethylene: LDPE). Further, a 9 μm aluminum foil 14 is employed as the metal foil that is the base material of the metal foil layer 10. A polyethylene terephthalate (PET) 9 of the innermost layer 7 is adhered and laminated on the lower surface of the aluminum foil 14 through an extruded resin film 15 of 15 μm polyethylene (low density polyethylene: LDPE). Therefore, this extruded resin film 15 functions as an adhesive layer between the innermost layer 7 and the metal foil layer 10. The outer layer 11 that is the upper layer portion 4B that is adhered and laminated on the outer side of the aluminum foil 14 is a high-quality paper 16 having a basis weight of 52.3 g / m ² . A 15 μm polyethylene (low density polyethylene: LDPE) extruded resin film 17 is laminated on the lower surface of the high quality paper 16. The extruded resin film 17 and the aluminum foil 14 are bonded to each other through a release agent layer 18 using a release varnish or the like to form a composite sheet. As a means for processing the composite sheet, a known technique other than the above is adopted, and a general technique such as laminating or coating is used. As the release agent layer 18, a release varnish (a chlorinated rubber-based material is applied) or an adhesive varnish (a chlorinated rubber-based material is applied in a dot shape) is employed. One or more peeling varnishes may be used in combination of two or more layers. The form of application may be solid or dot.

The polyethylene sealant layer 8 is suitably selected in a thickness range of 30 to 200 μm, and the polyethylene extruded resin film 12 thereon is appropriately selected in a thickness range of 5 to 50 μm. The aluminum foil 14 of the metal foil layer 10 is appropriately selected with a thickness in the range of 6 to 50 μm. The polyethylene extruded resin film 15 on the lower surface of the aluminum foil 14 is appropriately selected from the range of 5 to 50 μm. Furthermore, the high-quality paper 16 is desirably selected appropriately from a range of a basis weight of 30 to 200 g / m ² . The extruded resin film 17 of polyethylene (low density polyethylene: LDPE) laminated on the lower surface of the fine paper 16 is appropriately selected from the range of 5 to 50 μm. A release varnish or an adhesive varnish is used for the release agent layer 18. The peeling varnish is applied solidly, and the adhesive varnish is applied in the form of dots. The polyethylene terephthalate (PET) 9 laminated on the polyethylene sealant layer 8 is appropriately selected from a range of 5 to 50 μm. However, the polyethylene terephthalate (PET) 9 may be provided as necessary.

  The overall shape of the lid 4 as shown in FIGS. 3 and 4 is a circle having substantially the same diameter as the opening 2A of the container body 2 and specifically about 90 mmφ. Then, the peripheral edge 4A is appropriately attached to the upper end of the opening 2A of the container body 2, that is, the upper end surface 6B of the curled portion 6. Generally, it is heat-sealed. However, although it may be affixed to the upper end surface of the rising wall 3A of the hopper 3, the upper end edge of the funnel 3B of the hopper 3, that is, the upper edge of the opening 3B1, is simply configured to come into contact. is there.

  Further, as shown in FIGS. 1 to 3, the lid 4 having the barrier property has three perforations or cut lines as the three strength weak points 13 at equal intervals in the radial direction from the center and in the circumferential direction ( In the illustrated example, a perforation) is provided. The range to be provided reaches the innermost layer 7 and the extruded resin film 15 of polyethylene. The metal foil layer 10 including the innermost layer 7 is easily broken by the perforation or the cut line which is the strength weak point portion 13, and is easily opened. As shown in FIG. 2, the perforation or cut line has a perforation length of 9 mm and a joint of 1 mm. The number of three is a minimum number for achieving the intended purpose of the present invention. Further, although it depends on the size of the lid 4, the desirable upper limit is ten. On the contrary, if the number is 11 or more, there is a concern that the strength of the lid 4 may be weakened, which is not preferable. Ideally, there are 3 to 10 (six examples are shown in FIG. 9).

  The protective cap 5 is made of the same material as the container body 2 or an appropriate resin such as high-density polyethylene (HDPE) or polypropylene whose thickness is set to about 0.8 mm. As shown in FIGS. 3 and 4, the container body 2 is externally fitted to the opening 2A to protect the lid 4 and to keep the inside hygienic.

  The operation of storing the powdered instant coffee P in the refill container 1 according to the present invention is generally performed through the opening 3B1 of the hopper 3.

Next, how to use the refill container 1 of Example 1 configured as described above will be described.
First, the protective cap 5 is removed. Then, since the lid 4 is exposed, the edge of the outer layer 11 which is the upper layer portion 4B is picked with a fingertip and pulled up upward. By this pulling up, the outer layer 11 is peeled off from the aluminum foil 14 of the lower metal foil layer 10 by a release agent layer 18 as a release layer. At this time, peeling sound is generated, so that virginity can be strongly impressed. Next, as shown in FIGS. 5 and 6, the container body 2 is turned upside down, and the funnel 3 </ b> B of the hopper 3 is in a position where it can be fitted into the cylindrical mouth 19 </ b> A of the jar 19, which is an example of a refill container. Address. The instant coffee P in the container body 2 has also flowed down from the hopper 3 into the funnel 3B, but is held by the lid 4. Next, as shown in FIGS. 7 and 8, a pressing force is applied to the container body 2 so as to push the funnel 3 </ b> B toward the mouth 19 </ b> A of the jar 19. This pressing force acts as a force for the upper portion 19 </ b> A of the jar 19, generally a cylindrical upper portion rising from the main body to push the lid 4. That is, the mouth portion 19A of the jar 19 functions as a force that pushes up the lid 4 and pushes it into the space S on the triangular section between the rising wall 3A of the hopper 3 and the funnel 3B. Since the lid 4 to which the pressing force is applied is provided with perforations that are strength weak points 13 in a radial manner, it is very easily broken and divided into a plurality of divided pieces along the perforation. The At the same time, the funnel 3B enters the mouth 19A of the jar 19. As a result, the opening 3B1 of the funnel 3B of the hopper 3 is opened, and the instant coffee P in the container body 2 is guided and flowed down into the jar 19 all at once while being guided to the center by the funnel 3B of the hopper 3. . The refill container 1 that has been refilled into the jar 19 is discarded. In the figure, 2B is the bottom of the container body 2.

  Therefore, the funnel 3B fitted inside the mouth portion 19A of the jar 19 guides and flows the instant coffee P into the jar 19 without falling down to the outside of the jar 19. In addition, there is no fear that the outside air will be touched more than necessary, and therefore the possibility that the fragrance and flavor are impaired can be reduced as much as possible.

  As a result of the performance test of the finished lid, the center part was successfully broken. Incidentally, the breaking strength was 100 N or less. Further, in the permeation liquid check test at the step 6A of the opening 2A using a paper cup, no leakage was observed. Furthermore, the example which a cover peeled from the opening part 2A of a paper cup at the time of high temperature preservation was not seen. Moreover, the barrier property of the whole lid was the same as that of the aluminum lid, and a preferable result was obtained. There was no odor generation compared to the hot melt lid. Furthermore, a perforation damage condition was examined by carrying out a transport test equivalent to 2000 km. However, no perforation breakage occurred in any of the test products due to the presence of the outer layer 12 mainly composed of paper.

  Thus, the innermost layer of the lid 4 is provided with a sealant layer 8 of polyethylene (linear hand low density polyethylene: LLDPE). Therefore, regardless of the presence of the step 6A of the opening 2A unique to the paper cup, even when the opening 2A of the paper cup is directly sealed with the lid 4, this can be well sealed. As a result, sufficient airtightness can be secured. Furthermore, since a hot melt was not adopted, a stable sealing property was obtained and the influence of odor could be eliminated. Further, regardless of the lid 4 having the strength weak point portion 13 on the inner side, the inner metal foil layer 10 and the innermost layer 7 can be firmly protected from external impact and pressing force, and the lid 4 having high safety. Was able to provide. In addition, when the outer layer 11 mainly composed of this paper is peeled off before the operation of pushing the lid 4 by the strength weak point portion 13, a light peeling sound is generated and the virginity can be strongly impressed. .

As shown in FIG. 10, the lid 4 having a barrier property shown in the second embodiment has a lower layer portion 4A mainly composed of a polyethylene sealant layer 8 and an upper layer portion 4B mainly composed of a metal foil layer 10 as a release agent. It is composed of a composite sheet laminated via a layer 18.
The innermost layer 7 is a sealant layer 8 of polyethylene (linear low density polyethylene: LLDPE) having a lowermost layer of 40 μm. 12 μm polyethylene terephthalate (PET) 9 is laminated on the upper surface of the polyethylene sealant layer 8 through an extruded resin film 12 of 20 μm polyethylene (low density polyethylene: LDPE). Also, a 7 μm aluminum foil 14 is employed as the metal foil that is the base material of the metal foil layer 10. An extruded resin film 15 of 20 μm polyethylene (low density polyethylene: LDPE) is laminated on the lower surface of the aluminum foil 14. On the other hand, 12 μm polyethylene terephthalate (PET) 21 is laminated on the upper surface via an extruded resin film 20 of 15 μm polyethylene (low density polyethylene: LDPE). The polyethylene terephthalate (PET) 9 of the lowermost layer 7 and the extruded resin film 15 of polyethylene (low density polyethylene: LDPE) of the lowermost surface of the upper layer portion 4B are bonded to each other through the release agent layer 18. As the release agent layer 18, a release varnish (a chlorinated rubber-based material is applied) or an adhesive varnish (a chlorinated rubber-based material is applied in a dot shape) is employed. One or more peeling varnishes may be used in combination of two or more layers. The form of application may be solid or dot. In this embodiment, a structure in which a chlorinated rubber-based release varnish is first applied to the upper surface of the polyethylene terephthalate (PET) 9 of the innermost layer 7 and then a chlorinated rubber-based adhesive varnish is applied in a dot shape thereon is adopted. is doing.

  In the above configuration, the lower layer portion 4A may employ a laminated body such as an aluminum foil, a plastic film, or paper. Further, without using these, only the sealant layer 8 of polyethylene (linear low density polyethylene: LLDPE) may be used. Furthermore, in the upper layer portion 4B, a laminated body such as a single aluminum foil or a plastic film or paper is adopted as necessary. The aluminum foil is in the range of 6 to 50 μm. The extruded resin film 15 of polyethylene (low density polyethylene: LDPE) on the lower surface of the aluminum foil 14 may be in the range of 5 to 50 μm.

  As the release agent layer 18, an easy peel film may be employed. The thickness is 20 to 100 μm, and the adhesive strength with the extruded resin film 15 of polyethylene (low density polyethylene: LDPE) on the lowermost surface of the upper layer portion 4B is set to 0.1 to 8N.

  Further, the lid 4 is provided with a tab 22 projecting radially outward from the peripheral edge of the lid 4 from the lower layer portion 4A to the upper layer portion 4B. The tab 22 is configured to peel the upper layer portion 4B from the lower layer portion 4A with the release agent layer 18 through a cut line (perforation) 23 provided between the periphery of the lower layer portion 4A. Such a tab 22 may be provided in the first embodiment.

  Furthermore, the shape of the lid 4 is basically the same as that of the first embodiment except for the configuration of the tab 22 as shown in FIG. The difference is that six perforations, which are the strength weak points 13, are provided radially at equal intervals from the center toward the edge. Further, a paper cup having a layer structure of aluminum is adopted as the container body 2.

  The results of the performance test of the finished lid are as follows. That is, the same results as in Example 1 were obtained for the unsealing property, sealing property, barrier property, presence or absence of odor, protection of the weak point of strength, and virgin property. At the same time, the upper layer portion could be well peeled off from the tab 22 and a good peeling feeling was obtained.

As shown in FIG. 12, the lid 4 having the barrier property shown in the third embodiment also has a peeled surface between a lower layer portion 4A mainly composed of a polyethylene sealant layer 8 and an upper layer portion 4B mainly composed of a metal foil layer 10. It is comprised by the composite sheet laminated | stacked through 18A.
The innermost layer 7 is a sealant layer 8 of polyethylene (linear low density polyethylene: LLDPE) having a lowermost layer of 40 μm. A 20 μm stretched polypropylene film (OPP) 24 was laminated on the upper surface of the polyethylene sealant layer 8 using a dry laminate adhesive 25 to obtain a laminated film as the lower layer portion 4A. Six perforations as strength weak points 13 were formed in a direction extending radially from the center of the laminated film to the sealing position to the container body 2. The perforation is 9 mm long and the joint is 1 mm. A 7 μm aluminum foil 14 is used as the metal foil layer 10 in the upper layer portion 4B. Further, a 12 μm polyethylene terephthalate (PET) 21 is laminated on the upper surface of the aluminum foil 14 via an extruded resin film 20 of 20 μm polyethylene (PE). Then, the upper surface of the stretched polypropylene film (OPP) 24 of the lowermost layer 7 and the lower surface of the aluminum foil 14 are extruded with a polyethylene (PE) resin film 26 and laminated. Thus, a two-layer peelable laminated film was obtained. A lid 4 was obtained by punching the laminated film into a circular shape with a designated size and having a tab shape. The extruded polyethylene (PE) resin film 26 and the stretched polypropylene film (OPP) 24 are different resins. Therefore, it was not completely bonded, and the upper layer portion 4B could be peeled from the lower layer portion 4A by hand on the peeling surface 18A. In Example 3, as described above, an easily peelable surface was obtained by using different resins for the uppermost resin film of the lower layer portion 4A and the lowermost resin film of the upper layer portion 4B. As a result, the structure of the release agent layer can be simplified, the number of manufacturing steps and the process can be simplified, and can be provided at low cost.

  The results of the performance test of the finished lid are as follows. That is, the same results as in Example 1 were obtained for the unsealing property, sealing property, barrier property, presence or absence of odor, protection of the weak point of strength, and virgin property. At the same time, the upper layer portion could be well peeled off from the tab 22 and a good peeling feeling was obtained.

In order to verify the above results, a comparative product was created.
As shown in FIG. 13, a stretched polypropylene film (OPP) having a thickness of 20 μm and a polyethylene (linear low density polyethylene: LLDPE) film having a thickness of 40 μm were dry laminated to obtain a laminated film. This laminated film was pinned with a pinnacle blade in a direction extending radially from the center of the circular lid material to the sealing position, and six perforations having a length of 9 mm and a joint of 1 mm were applied to obtain a lower layer film. On the other hand, an aluminum foil having a thickness of 7 μm was bonded by extrusion lamination of 15 μm of polyethylene (PE) to obtain an upper film. Then, the upper and lower layer films are laminated on the above-mentioned stretched polypropylene film (OPP) surface via an anchor coating agent to obtain a laminated film, and the laminated film is punched into a circular shape of a specified size to obtain a lid material. It was.

The obtained lid material was adhered and sealed to the periphery of the opening 2A of the container body 2 containing the instant coffee powder shown in Example 1, and performance tests were conducted on the lid opening performance and drop impact resistance.
In the inspection of the openability, the product according to the present example picks up the tab 22 and peels off the upper layer part 4B. Then, in the comparative example, the product is refilled into a glass bottle as it is. The pressing strength was measured when the lid was opened by pressing the cover.

  As a result of the inspection, the unsealing strength of the present example was 90 g, whereas the comparative example showed a numerical value of 130 g, and it was found that the unsealability according to the present example was far superior.

  In the drop impact resistance test, in both the present example and the comparative example, the container is dropped from a height of 60 cm in a state where the opening 2A of the container body 2 is sealed with a lid material, and there is no tear from the perforation. It was confirmed visually.

  As a result of the inspection, no breakage was observed even when dropped 10 times in both this example and the comparative example, and the superiority of this example was not obtained with respect to drop impact resistance.

  In each of the above-described embodiments, the upper end of the rising wall 3A of the hopper 3 may be provided with a flange portion that fits airtightly to the opening edge of the container body 2. Among the functions of the above-described Examples 1 to 3 of the lid 4 itself, the advantages such as the unsealing property, the high temperature retention property, the barrier property, the odor, the unsealing feeling, and the workability and stability of the strength weak point portion 13 are completely eliminated. It does not come off and can achieve the same effect.

  In the above embodiment, instant powdered coffee is used as the contents, but it can be applied to other fluids of food and non-food. For example, water-soluble milk (powdered milk), cocoa, tea, or a combination thereof. In addition to dry mashed potatoes and other dry foods, sauce or gravy powder, soup powder, etc., toner for copying machines.

  Further, as an alternative to the jar 19, the present invention can be applied to a coffee powder tank of a coffee making device and a toner replenishing container of a copying machine.

DESCRIPTION OF SYMBOLS 1 ... Container for refilling 2 ... Container main body 2A ... Opening part 3 ... Hopper 4 ... Cover 4A ... Lower layer part 4B ... Upper layer part 5 ... Protective cap 6 ... Curled part 6A ... Step 7 ... Innermost layer 8 ... Sealant layer 10 ... Metal foil Layer 11 ... Outer layer 13 ... Strength weak point 14 ... Aluminum foil 18 ... Releasing agent layer 18A ... Peeling surface 19 ... Jar

Registered Utility Model No. 3035303 Japanese Utility Model Publication No. 06-085295 JP 2002-104515 A Japanese Patent Laid-Open No. 09-110077 Japanese Patent Laid-Open No. 06-001375 Japanese Utility Model Publication No. 07-017762

Claims (9)

  It consists of a lower layer part consisting of an innermost layer and a metal foil layer having a polyethylene sealant layer at least in the lowermost layer, and an upper layer part that can be peeled from this lower layer part, and the innermost layer of the lower layer part has a plurality of strengths. A lid having a barrier property that is provided with a weak point portion and can be separated by peeling the upper layer portion from the lower layer portion, and the lower layer portion is broken by the strength weak point portion during use and is easily opened.   A metal foil layer, a lower layer portion formed of a laminate in which at least one of a metal foil layer, a synthetic resin layer, and a paper layer is laminated on an innermost layer having at least a polyethylene sealant layer as a lowermost layer, and a metal foil layer In addition, the lower layer portion includes a synthetic resin layer, and an upper layer portion that is formed of a laminate in which at least one of a paper layer is laminated and is laminated on the outside of the lower layer portion via a release layer. Is provided with a plurality of strength weak points, and the upper layer part can be separated from the lower layer part through the release layer, and when used, the lower layer part is broken by the strength weak point part to facilitate opening. A lid with barrier properties.   A lower layer part in which a metal foil layer is pasted via an adhesive layer on an innermost layer provided with a polyethylene sealant layer at least in the lowermost layer, and laminated on the outside of the lower layer metal foil layer via a release layer It consists of an upper layer part mainly composed of paper, and the innermost layer of the lower layer part is provided with a plurality of strength weak points radially from the center so that the upper layer part can be separated from the release layer and used. A lid having a barrier property that sometimes breaks the metal foil layer including the innermost layer of the lower layer part by the strength weak point part, and is easy to open.   The lid having a barrier property according to any one of claims 1 to 3, wherein the weak point portion is either a perforation or a cut line.   The lid having barrier properties according to any one of claims 1 to 4, wherein at least three strength weak points are provided radially with substantially the same central angle from the center toward the edge.   The lower layer part has a two-layer structure in which the lowermost layer of the innermost layer is a polyethylene resin layer, and the resin layer is stuck on the polyethylene resin layer via an adhesive layer. The lid | cover which has the barrier property of crab.   The lid having a barrier property according to any one of claims 1 to 6, wherein the upper layer portion is formed by adhering a paper or metal foil layer and at least an extruded polyethylene resin layer on the back surface thereof.   The lid having barrier properties according to any one of claims 1 to 7, wherein the release layer is any one of a release varnish, an adhesive varnish, and an easy peel film.   The barrier property according to any one of claims 1 to 8, wherein the upper layer part can be peeled from the lower layer part by using different resins for the uppermost resin film of the lower layer part and the lowermost resin film of the upper layer part. Lid with.

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