JP2019077470A - Lid material and packaging container - Google Patents

Abstract

To provide a lid material and a packaging container on which an opening can be easily made even with relatively small force to discharge liquid first without making a container body into any special shape.SOLUTION: It has an outer layer 11 made of a thermoplastic resin film, an inner layer 13 made of linear low-density polyethylene resin, undrawn polypropylene resin or easy-peel sealant resin, and an adhesive layer 12 that adheres the outer layer and the inner layer. On the outer layer is formed a linear fragile processing part 14 which reaches the inner layer side of the outer layer and does not penetrate the inner layer, and the maximum strength when piercing on the fragile processing part at a speed of 50±5 mm/minute a semicircular needle with a diameter of 6 mm and a tip radius of 3.0 is 33 N or less.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a lid and a packaging container, and in particular, when the content is used as a lid of a packaging container sealed with a liquid, the lid can easily provide an opening for discharging the liquid to the packaging container. And a packaging container using the lid.

  Conventionally, when a content such as food is stored in a packaging container, the content which is likely to lose its shape due to an impact or the content which needs to be circulated in a state immersed in the liquid is enclosed with the liquid to damage the content. There is known a package which is designed to prevent drying and drying. For example, tofu, agar, konjac, spotted fish, and boiled eggs of salmon are widely distributed in the market in this manner.

  When taking out the contents from the packaging container of such a mode, if the liquid enclosed together is drained from the packaging container before taking out the contents, only the remaining contents can be taken out easily. Because it is convenient for handling, various packaging containers that have been devised for that purpose have been proposed and used.

  FIG. 6 shows an example of a conventionally used tofu container. The container 101 of the container main body 100 is filled with tofu 110 and water almost without a gap, and the lid 102 is heat-sealed by the flange portion 103 at the periphery and sealed. It is done. At a corner of the lid 102, a knob 104 is provided for the convenience of peeling the lid 102 from the container body 100.

  Then, hold the knob 104 and slightly tear off the lid 102 at the corner of the container body 100 to open the container, drain the enclosed water first, and then tear off the lid 102 completely tofu 110 It is what you take out. However, since the heat seal of the flange portion 103 is strongly sealed so as not to be peeled off in the process of circulation, it is necessary to apply a corresponding force to peel it off. It is difficult for women and elderly people who are weak, and they have been unable to peel off well, and sometimes they overwhelm water and tofu and wet their hands and surroundings.

  Further, in Patent Document 1, as a package containing tofu and water, a lid covering the opening of the container has a two-layer structure of a main body sheet and a sealant layer, and only the main body sheet can be peeled off. The package which exposed the penetration provided in the layer and enabled it to discharge only water from the penetration first is disclosed.

  However, in such a package, when the tofu of the contents is taken out, it must be peeled off twice with the main sheet and the sealant layer, which is troublesome, and it is particularly troublesome for women with weak grip and elderly people. When the main body sheet is peeled off, there is a possibility that the sealant layer may be peeled off together with the part of the through hole, which may cause inconvenience.

  Further, in Patent Document 2, a slope is formed on one side surface of the container storage portion, a drainable convex portion that can be reversed in a concave shape is formed on the slope, and the lid material is partially formed on the side surface on which the drain convex portion is formed. There is disclosed a tofu container which is opened to discharge water, and then the convex portion is inverted to be concave to take out the tofu. However, in the container of Patent Document 2, the shape of the container is complicated and it takes time to design and manufacture, the size is larger than that of the content tofu, and the efficiency at the time of distribution is reduced. Also has the problem of being complicated.

JP, 2016-159976, A Patent No. 4935150

  In view of the problems of the prior art as described above, the present invention is a lid material applicable to a packaging container that stores contents such as tofu together with a liquid and allows the contents to be taken out after the liquid is discharged first. There is no need to make the shape of the container body special, and an opening for discharging the liquid first can be easily provided even with a relatively small force, so that the liquid may spill or wet the hand. It is an object of the present invention to provide a lid material and a packaging container which can be reliably discharged without the need.

In order to solve the above-mentioned subject, the invention concerning claim 1 of the present invention is:
A lid made of a laminated film which is heat sealed to the flange of the container body to seal the opening of the container, wherein the laminated film is an outer layer made of a thermoplastic resin film, and a linear low density polyethylene resin Or an inner layer made of non-oriented polypropylene resin or easy peel sealant resin, and an adhesive layer bonding the outer layer and the inner layer, and laser irradiation from the outer layer side reaches the outer layer to the inner layer side of the outer layer A linear frangible portion which does not penetrate the inner layer is formed, and a semicircular needle having a diameter of 6 mm and a radius of 3.0 mm is pierced through the frangible portion at a speed of 50 ± 5 mm / min. The maximum strength at the time is 5 N or more and 33 N or less.

The invention according to claim 2 of the present invention is
The lid according to claim 1, wherein the outer layer is made of a thermoplastic resin film containing a CO double bond.

The invention according to claim 3 of the present invention is
The lid material according to any one of claims 1 and 2, wherein the fragile processing portion is a straight line or a curved line or a combination thereof having a length of 3 mm or more.

The invention according to claim 4 of the present invention is
It is a cover material according to any one of claims 1 to 3, characterized in that a visible mark indicating the position of the fragile processing portion is displayed.

The invention according to claim 5 of the present invention is
It is a packaging container which has an opening part which has a storage part and a flange part in a peripheral edge, and stores contents with said liquid in said storage part, and is an inner layer of a lid according to any one of claims 1 to 5. A packaging container characterized by being heat-sealed and sealed to a flange portion.

  According to the invention as set forth in claim 1 of the present invention, laser light is irradiated from the outer layer side of the lid member consisting of the laminated film in which the outer layer, the adhesive layer and the inner layer are laminated to form a fragile processed portion in the outer layer. Therefore, for fragile processing, for example, it is not necessary to prepare a die such as half-cut processing, and a fragile processing portion is formed, and the resin of the inner layer is made difficult to absorb laser light, so that the inner layer is laser light. At the same time, it is possible to prevent the material from being weakened and the sealing performance of the lid material is maintained, and the maximum strength when piercing at a fixed speed through a rod-like object such as an eyebrow from the outer layer side By setting the value below the specific value, it is possible to easily provide an opening for liquid discharge in the lid material with a safe member such as a vegetable pot that is familiar to even weak women and elderly people, and the container main body No special structure for liquid discharge It can provide a lid which can be.

  Further, according to the invention as set forth in claim 2, the resin constituting the outer layer contains a specific double bond, so that even a resin film which is generally easy to obtain can absorb carbon dioxide gas laser light more efficiently. Thus, it is possible to provide a lid material which can be converted into heat energy to perform fragile processing efficiently.

  Further, according to the invention as set forth in claim 3, by setting the length of the weakly machined portion to a linear shape of 3 mm or more, the load when opening the fragile machined portion can be made lower than a predetermined value. It is possible to provide a lid material which can be easily provided with an opening for liquid discharge with cans such as sugar beet.

  Further, according to the invention described in claim 4, by providing a visible mark in the fragile processing portion, when trying to provide an opening for liquid discharge, a lid member which does not mistake the part to be opened Can provide

  Further, according to the invention described in claim 5, a packaging container capable of sealing the contents and facilitating the discharge of the liquid prior to the removal of the contents without providing a special structure or mechanism in the container body is provided. Can be provided.

It is a cross-sectional schematic diagram which shows the structure of the cover material of this invention, and the outline | summary of preparation procedures. It is an appearance perspective view of a mode which heat-sealed a lid material of the present invention to a tofu container. It is a cross-sectional schematic diagram explaining the aspect by which the weak process part of the cover material of this invention is opened. It is a schematic diagram explaining the procedure of opening a lid material and discharging | emitting a liquid when the lid material of this invention is applied to a tofu container. It is explanatory drawing which shows the example of the shape of a weak process part. It is an external view of an example of the packaging container of the conventional tofu.

  Hereinafter, embodiments of the present invention will be described in detail. The present invention is not construed as being limited to the following embodiments.

  FIG. 1 is a schematic cross-sectional view showing the structure of one embodiment of a lid of the present invention and an outline of a preparation procedure. The lid member 10 is an outer layer 11 made of a thermoplastic resin film which becomes the outside of the container when heat sealed to the container, and a linear low density polyethylene resin or non-oriented polypropylene resin or easy peel which is the side heat sealed to the container. An inner layer 13 made of a sealant resin and an adhesive layer 12 made of an adhesive for bonding the outer layer 11 and the inner layer 13 are laminated. Although a urethane type adhesive agent is used suitably, an adhesive agent is not specifically limited. The lamination can be performed by appropriately applying dry lamination and known lamination techniques. Moreover, as long as it does not affect the performance as a lid material besides this, another layer can also be added, for example, a printing layer, a barrier layer, etc. may be provided.

  Subsequently, the laser beam 30 is irradiated from the outer layer 11 side, and the fragile processed portion 14 is formed in the outer layer 11. The weakly processed portion 14 is formed by the resin of the outer layer 11 being damaged by the laser beam 30, and may be formed from the outer surface side to the inner surface side of the outer layer 11 as shown in the drawing. However, if the inner layer 13 is weakened, the sealability as the lid material may be impaired, which is not preferable. Such brittle processing can be performed by appropriately adjusting the irradiation time and intensity of the laser beam 30 in accordance with the material and thickness of the resin of the outer layer 11 and the like.

  Further, it is more preferable that the thermoplastic resin film constituting the outer layer 11 be a resin containing a CO double bond, because the outer layer 11 can be more easily and surely subjected to brittle processing. This is because the absorption wavelength of the CO double bond is close to the wavelength of the carbon dioxide gas laser, so by using the carbon dioxide gas laser as the laser light 30, the outer layer 11 absorbs the energy of the laser light 30 more efficiently to make it fragile However, since the linear low density polyethylene resin which is the resin of the inner layer 13, the non-oriented polypropylene resin and the easy peel sealant resin hardly absorb the carbon dioxide gas laser, the inner layer 13 hardly receives any damage. Even if the adjustment of the intensity of the light 30 and the irradiation time are not so strict, it is possible to make the outer layer 11 fragile without weakening the inner layer 13.

  In the embodiment of the fragile processing portion 14, the resin of the portion is carbonized or the like by the irradiation of the laser light 30 in a linear shape, or the resin of the portion is absorbed by absorbing the laser light. It sublimes and disappears, and it becomes an aspect of becoming grooved. That is, the lid 10 is in the same state as the half-cut in the fragile processing portion 14. Usually, in order to form a half cut, it is necessary to prepare a dedicated punching die, but processing can be performed efficiently because the same processing can be performed by laser light irradiation.

  As resin which contains CO double bond and is widely utilized as a film, polyethylene terephthalate resin, polyamide resin, polybutylene terephthalate resin, etc. can be illustrated, and all can be suitably used as resin of outer layer 11. Since the adhesive generally has a property of absorbing a carbon dioxide gas laser, the adhesive layer 12 is embrittled or disappears in the same manner as the outer layer 11.

  FIG. 2 is an external perspective view of an aspect in which the lid 10 of the present invention is heat-sealed to the opening of the tofu container to form the packaging container 20. In the packaging container 20, the flat rectangular tofu 23 is stored in the storage portion 21 together with the water, and the lid member 10 is heat sealed and sealed by the flange portion 22 at the periphery of the opening. The frangible portion 14 may be provided near the edge of the packaging container 20, that is, in the vicinity of the flange portion 22 for the purpose of discharging the liquid (here, water). In addition, the fragile process part 14 can be provided in one place or multiple places close to the square corner of a tofu container, has a shape close to a straight line, and the length may be 5 to 10 mm. Although depending on the size of the container, the upper limit is about 20 mm in consideration of the fact that the lid 10 is not torn when the fragile processing portion 14 is gripped by hand. Moreover, the mark 15 for making it easy to visually recognize the position of the weak process part 14 can be provided in the cover material 10 suitably. The shape and color of the mark 15 are not particularly limited, and in addition to the enclosure 15 as shown in FIG. 2, it is possible to take any form such as a symbol such as an arrow or a star or coloring with colors. As resin which comprises main-body parts other than the cover material 10 of the packaging container 20, either of polypropylene (PP), a polyethylene terephthalate (PET), a polyvinyl chloride (PVC), and a polystyrene (PS) can be selected.

  FIG. 3 is a schematic cross-sectional view for explaining an aspect in which the fragile processing portion 14 of the lid member 10 of the present invention is opened. When the lid material 10 is applied to a packaging container for sealing the contents together with the liquid, in order to open the fragile processing portion 14 for discharging the liquid first, first, the rod-like member 40 such as rapeseed is outer layer When the weakly machined portion 14 is pressed into the weakly machined portion 14, the weakly machined portion 14 is embrittled or grooved, so that the rod-like member 40 can be easily pushed in. Furthermore, as the inner layer 13, those commercially available as linear low density polyethylene resin, non-oriented polypropylene resin, or easy peel film can be used, and since all have relatively low mechanical strength, the rod-like member 40 is relatively It can be broken by pushing with a small force (Fig. 3 (b)). Furthermore, the through-hole 16 can be formed by pushing in the rod-shaped member 40 so that an inner layer may be penetrated (FIG.3 (c)).

The inventors found that by making the piercing strength of the fragile processing portion 14 smaller than a predetermined value, it is possible to easily provide an opening for liquid discharge in the lid material with a safe member such as a vegetable bowl. The value is 50 ± 5 mm for a semicircular needle with a diameter of 6 mm and a radius of 3.0 mm at the tip.
The maximum strength when piercing at a speed of 1 / min is 5N or more and 33N or less. By setting it as such a value, while sufficient sealing property is securable, a penetration can be easily provided with a familiar comparatively safe member like a chopsticks or a potato bowl.

  FIG. 4 is a schematic view for explaining the procedure for opening the lid and discharging the liquid when the lid configured in this way is applied to, for example, a tofu container to make a packaging container. The frangible portion 14 provided in the vicinity of the flange portion 22 of the lid member 10 heat sealed to the flange portion 22 of the packaging container and the peeling strength of 10 to 15 N is surrounded by the mark 15 for clearly indicating the position. ing. When the potato tuber 40, which is a rod-like member, is pressed against the fragile processing unit 14 as a black arrow and pierced, the potato tuber 40 penetrates the lid 10, and the through hole 16 is formed. Then, by tilting the packaging container, the sealed water 24 can be discharged from the through hole 16.

  FIG. 5 shows a mode in which a plurality of fragile processing parts 14 are provided on the lid member 10 for the sake of convenience in order to explain various shapes of the fragile processing parts 14, and as shown in FIG. Is not meant to be provided. The shape of the fragile processing portion 14 is linear because it is formed by the irradiation of the laser beam 30, but the details of the shape are not particularly limited, and linear, curved, broken or combinations thereof, U-shaped It can be made into arbitrary shapes, such as V shape, X shape, and round shape. Further, as described above, it is preferable that the position where the fragile processing portion 14 is provided is a position corresponding to the end of the container, that is, the vicinity of the flange, for discharging the liquid without discharging.

  As described above, the lid material of the present invention is subjected to brittle processing by laser beam irradiation on a lid material made of a predetermined laminated film, and has a predetermined puncture strength, so that it is relatively safe to use, such as rapeseed, Can be easily provided with an opening in the shape of a bar-like article, and discharging the liquid first from the packaging container in which the contents are sealed together with the liquid can provide the lid material and the packaging container which can easily be performed by a person with weak force. It is a thing.

Each lid material sample prepared as described below was heat-sealed to the container flange portion, and brittle processing was performed under the following conditions to evaluate puncture strength and penetration.
Laser light source: LP-400 series CO ₂ laser maker Class 4 manufactured by SUNX
Laser product wavelength: 10.6 μm
Irradiation conditions: Scan speed 700 mm / sec, power: 18 W
Vulnerable processing length: 3 mm, 5 mm, 10 mm samples are prepared under three conditions fragile processing shape: linear or semicircular lid material size: 100 mm x 130 mm
Container size: 100 mm x 130 mm x 40 mm
Contents: For 300g of tofu and water 突 Prick strength For the processing part, refer to the method of puncture strength test prescribed in JIS 1707-1997, however the size of the needle takes into consideration the practical situation (assuming wrinkles) The maximum strength was measured when a semicircular needle having a diameter of 6 mm and a tip shape of 3.0 mm in radius was pierced at a speed of 50 ± 5 mm / min (Shimadzu autograph AGS-1 kNJ7).
貫通 Good penetration: When stabbing a fragile processed part with a potato stick, it can be penetrated without great resistance.
Acceptable: Permeability of those who feel resistance when stabbing a fragile processing part with a potato paste is possible.
Impossible: Can not penetrate when stabbing a fragile processing part with rapeseed.

Example First Group
Example 1 The first group uses a nylon film with a thickness of 15 μm as the outer layer, a urethane-based adhesive as the adhesive layer, and a non-oriented polypropylene (CPP) film with a thickness of 30 μm as the inner layer to make a lid sample The evaluation was made in the following examples and comparative examples.
(Example 1) fragile processing length: 3 mm, fragile processing shape: straight line (Example 2) fragile processing length: 3 mm, fragile processing shape: semicircle (example 3) fragile processing length: 5 mm, fragile processing shape : Straight line (Example 4) fragile processing length: 10 mm, fragile processed shape: straight line (comparative example 1) fragile processing: none

Example Second Group
The second sample of the second embodiment is the same as the first group of the first embodiment except that a linear low density polyethylene (LLDPE) film having a thickness of 30 μm is used as the inner layer. 8 and Comparative Example 2.

Example Third Group
The third example of the lid is similar to the first example of the first example of the lid except that a polyethylene terephthalate (PET) film with a thickness of 12 μm is used as the outer layer and a 50 μm-thick non-oriented polypropylene (CPP) film is used as the inner layer. Trial manufacture and evaluation were made, and it was set as Examples 9-12 and Comparative Example 3.

Example Fourth Group
The third embodiment of the present invention performs trial manufacture and evaluation of a lid material sample in the same manner as the third embodiment except that a linear low density polyethylene (LLDPE) film having a thickness of 50 μm is used as the inner layer. 16, and Comparative Example 4.

  The results are summarized in Table 1 below.

  As can be seen from Table 1, it was found that it is possible to easily provide an opening by penetrating the lid material with a sugar cane even when using a film laminate of any material if the maximum strength is 33 N or less. On the other hand, when weak processing was not performed, the maximum strength was large, and penetration with a potato was impossible.

DESCRIPTION OF SYMBOLS 10 ... Lid material 11 ... Outer layer 12 ... Adhesive layer 13 ... Inner layer 14 ... Weakly processed part 15 ... Mark (surrounding)
DESCRIPTION OF SYMBOLS 16 ... Through-hole 20 ... Packaging container 21 ... Storage part 22 ... Flange part 23 ... Tofu 24 ... Water 30 ... Laser beam 40 ... Rod-shaped member (rape meal)
100 ... Conventional tofu container main body

Claims (5)

  A lid material comprising a laminated film which is heat-sealed to the flange of the container body to seal the opening of the container body, wherein the laminated film comprises an outer layer comprising a thermoplastic resin film and a linear low density polyethylene resin or A linear fragile processed portion having an inner layer made of non-oriented polypropylene resin or easy peel sealant resin, and an adhesive layer bonding the outer layer and the inner layer, reaching the outer layer side of the outer layer and not penetrating the inner layer. The maximum strength of the semi-circular needle with a diameter of 6 mm and a radius of 3.0 mm is pierced at a speed of 50 ± 5 mm / min. Cover material to be characterized.   The lid according to claim 1, wherein the outer layer is made of a thermoplastic resin film containing a CO double bond.   The lid according to any one of claims 1 and 2, wherein the fragile processing portion is a straight line or a curve or a combination thereof having a length of 3 mm or more.   The lid material according to any one of claims 1 to 3, wherein a visible mark indicating the position of the fragile processing portion is displayed.   It is a packaging container which has an opening part which has a storage part and a flange part in a peripheral edge, and stores contents with said liquid in said storage part, and is an inner layer of a lid according to any one of claims 1 to 4. A packaging container characterized by being heat-sealed and sealed in a flange portion.