WO2015046024A1 - 積層剥離容器 - Google Patents
積層剥離容器 Download PDFInfo
- Publication number
- WO2015046024A1 WO2015046024A1 PCT/JP2014/074744 JP2014074744W WO2015046024A1 WO 2015046024 A1 WO2015046024 A1 WO 2015046024A1 JP 2014074744 W JP2014074744 W JP 2014074744W WO 2015046024 A1 WO2015046024 A1 WO 2015046024A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- evoh
- container
- inner layer
- contents
- Prior art date
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- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 82
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims description 80
- 230000004888 barrier function Effects 0.000 claims description 43
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 230000032798 delamination Effects 0.000 claims description 20
- -1 polypropylene Polymers 0.000 claims description 19
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 10
- 239000005977 Ethylene Substances 0.000 claims description 9
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical group C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims 8
- 239000010410 layer Substances 0.000 description 243
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- 229920000098 polyolefin Polymers 0.000 description 11
- 239000002344 surface layer Substances 0.000 description 10
- 229920000092 linear low density polyethylene Polymers 0.000 description 9
- 239000004707 linear low-density polyethylene Substances 0.000 description 9
- 229920001684 low density polyethylene Polymers 0.000 description 8
- 239000004702 low-density polyethylene Substances 0.000 description 8
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 6
- 238000000071 blow moulding Methods 0.000 description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 239000012790 adhesive layer Substances 0.000 description 5
- 238000003475 lamination Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920003354 Modic® Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 235000010746 mayonnaise Nutrition 0.000 description 1
- 239000008268 mayonnaise Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 235000013555 soy sauce Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
- B65D35/14—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor with linings or inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/02—Membranes or pistons acting on the contents inside the container, e.g. follower pistons
- B05B11/026—Membranes separating the content remaining in the container from the atmospheric air to compensate underpressure inside the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/04—Deformable containers producing the flow, e.g. squeeze bottles
- B05B11/048—Deformable containers producing the flow, e.g. squeeze bottles characterised by the container, e.g. this latter being surrounded by an enclosure, or the means for deforming it
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
Definitions
- the present invention relates to a laminated peeling container in which an inner layer peels from an outer layer and shrinks as the contents are reduced.
- Patent Document 1 a laminated peeling container that suppresses air from entering the container by peeling and shrinking the inner layer from the outer layer as the contents are reduced.
- the innermost layer of the outer layer is a polypropylene layer and the outermost layer of the inner layer is an EVOH layer.
- the peelability between the polypropylene layer and the EVOH layer is excellent, so that the oxygen barrier property is excellent and the inner layer Can be easily peeled and contracted.
- the delamination container is usually composed of a main body part for storing the contents and a mouth part for discharging the contents, while the inner layer smoothly peels from the outer layer in the main body part. There is a demand for preventing the inner layer from peeling from the outer layer at the mouth.
- the first aspect of the present invention has been made in view of such circumstances.
- the inner layer smoothly peels from the outer layer, while in the mouth portion, the inner layer is prevented from peeling from the outer layer.
- a delamination container that can be provided is provided.
- the second aspect of the present invention has been made in view of such circumstances, and provides a delamination container that can suppress a decrease in oxygen barrier properties.
- the apparatus includes a main body part that stores contents, and a mouth part that discharges the contents from the main body part, and the main body part and the mouth part include an outer layer and an inner layer.
- the present inventor has found that the inner layer can be easily separated from the outer layer in the main body by setting the standard peel strength of the outermost layer of the inner layer to 7 to 12 g / 15 mm in the laminated peeling container in which the inner layer peels from the outer layer. As a result, it was found that an ideal delamination container was obtained in which the inner layer was difficult to peel from the outer layer at the mouth, and the present invention was completed.
- the outermost layer is an EVOH layer.
- the EVOH layer contains an oxygen absorbent.
- the EVOH layer has an ethylene content of 30 mol% or less.
- the outer layer includes a polypropylene layer as an innermost layer.
- a laminated peeling container comprising an outer layer and an inner layer, wherein the inner layer peels from the outer layer and shrinks as the contents are reduced, and the inner layer includes the EVOH layer,
- a delamination container including an outer barrier layer provided on the container outer surface side of the EVOH layer and an inner barrier layer provided on the container inner surface side of the EVOH layer.
- the present inventors have found that when the EVOH layer is exposed to water vapor, the oxygen barrier property may decrease, and in the delamination container, the inner layer peels from the outer layer, so that the inner layer is separated from the outer layer. Since the EVOH layer is exposed to the air that has entered, it is understood that when the delamination container is used in a high-humidity environment, the oxygen barrier property of the EVOH layer is lowered, and as a result, the contents deteriorate. It was. And it discovered that the fall of the oxygen barrier property of an EVOH layer was suppressed by providing a barrier layer on both sides of an EVOH layer, and thereby the deterioration of the content was suppressed, and it came to the completion of this invention.
- the EVOH layer contains an oxygen absorbent.
- an outer EVOH layer is further provided on the outer surface side of the outer barrier layer.
- FIG. 1 is sectional drawing which shows the structure of the lamination peeling container 1 of 1st Embodiment of this invention, (a) shows the state which the outer layer 3 and the inner layer 5 contacted, (b) Indicates a state in which the inner layer 5 is peeled from the outer layer 3. It is sectional drawing which shows the structure of the inner layer 5 of the lamination peeling container 1 of 1st Embodiment of this invention. The measuring method of the peeling strength in the Example of this invention is shown. It is an example of the graph which shows the relationship between the distance at the time of the peeling strength test in the Example of this invention, and a load.
- first embodiment is mainly related to the first aspect of the present invention
- second to third embodiments are mainly related to the second aspect of the present invention.
- the contents described in the first to third embodiments can be combined with each other.
- a delamination container 1 As shown in FIGS. 1 (a) and 1 (b), a delamination container 1 according to a first embodiment of the present invention includes a main body 1a composed of a cylindrical body and a bottom, and contents. And a mouth portion 1b for filling and discharging objects.
- the mouth portion 1b is provided with a male screw portion 1c.
- a cap or a pump having a female screw is attached to the male screw portion 1c.
- the delamination container 1 includes an outer layer 3 on the container outer surface side and an inner layer 5 on the container inner surface side.
- the accommodation space 7 surrounded by the inner layer 5 is filled with the contents.
- FIG. 1A shows a state in which the contents are fully filled in the container and the outer layer 3 and the inner layer 5 are in contact with each other, and
- FIG. 1B shows that the contents are discharged from the mouth portion 1b. Shows a state in which the inner layer 5 is peeled from the outer layer 3 and the accommodation space 7 is contracted.
- an air introduction hole is provided in the outer layer 3 of the main body 1a or the mouth 1b, and air can be introduced through the air introduction hole.
- a check valve may be provided in the air introduction hole so that air is not discharged from the space 9 to the outside.
- the contents are discharged from the storage space 7 by pressing the outer layer 3 like a squeeze container for storing contents such as mayonnaise and soy sauce, so that the inner layer 5 is crushed together and the contents are discharged from the mouth portion 1b.
- a pump may be attached to the male screw portion 1c and the contents may be discharged by operating the pump.
- a check valve is provided in the air introduction hole, when the outer layer 3 is crushed, the internal pressure of the air between the outer layer 3 and the inner layer 5 increases, so that the inner layer 5 is crushed and the contents are crushed. It can also be discharged.
- the inner layer 5 When air enters the space 9 between the outer layer 3 and the inner layer 5, the outermost layer of the inner layer 5 is exposed to the air.
- the inner layer 5 includes an EVOH layer 5a which is the outermost layer, an inner surface layer 5b provided on the inner surface of the container of the EVOH layer 5a, and an adhesive provided between the EVOH layer 5a and the inner surface layer 5b.
- a layer 5c is provided.
- the outermost layer of the inner layer 5 is the EVOH layer 5a, but the outermost layer may be formed of another resin as long as the standard peel strength is 7 to 12 g / 15 mm.
- the EVOH layer 5a is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of ethylene and vinyl acetate copolymer.
- the ethylene content of the EVOH resin is, for example, 25 to 50 mol%, preferably 25 to 35 mol%, more preferably 25 to 30 mol% from the viewpoint of oxygen barrier properties.
- the EVOH layer 5a preferably contains an oxygen absorbent. By containing the oxygen absorbent in the EVOH layer 5a, the oxygen barrier property of the EVOH layer 5a can be further improved.
- the EVOH layer 5a has a standard peel strength of 7 to 12 g / 15 mm.
- the standard peel strength is within the above range, the ideal laminated peeling container 1 in which the inner layer 5 is easily peeled from the outer layer 3 in the main body 1a and the inner layer 5 is difficult to peel from the outer layer 3 in the mouth 1b.
- the standard peel strength is, for example, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12 g / 15 mm, and is exemplified here. It may be within a range between any two of the numerical values.
- the measuring method of standard peeling strength is demonstrated in detail in an Example.
- the EVOH layer 5a preferably has a tensile elastic modulus of 2000 MPa or less, and more preferably 1800 MPa or less. This is because if the tensile elastic modulus is too high, the EVOH layer 5a is difficult to peel off from the outer layer 3 smoothly.
- the lower limit of the tensile elastic modulus is not particularly specified, but is, for example, 1000 MPa.
- the tensile elastic modulus is, for example, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000 MPa, and within a range between any two of the numerical values exemplified here. There may be.
- the inner surface layer 5b is a layer that comes into contact with the contents of the delamination container 1, and is, for example, a polyolefin such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, and a mixture thereof. It is preferably made of low-density polyethylene or linear low-density polyethylene.
- the adhesive layer 5c is a layer having a function of adhering the EVOH layer 5a and the inner surface layer 5b.
- an acid-modified polyolefin having a carboxyl group introduced into the above-described polyolefin eg, maleic anhydride-modified polyethylene
- ethylene vinyl acetate copolymer EVA
- An example of the adhesive layer 5c is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.
- the outer layer 3 is made of the above-mentioned polyolefin, for example, and polypropylene is preferable.
- the outer layer 3 has a single-layer configuration, but the outer layer 3 may have a multi-layer configuration.
- the innermost layer is preferably a polypropylene layer, and for example, a configuration in which both sides of a repro layer are sandwiched between polypropylene layers can be employed.
- the repro layer refers to a layer that is recycled from the burr that was produced when the container was molded.
- the outer layer 3 is formed thicker than the inner layer 3 so as to have resilience.
- the manufacturing method of the lamination peeling container 1 of this embodiment is not specifically limited,
- the laminated parison of a molten state provided with the laminated structure corresponding to the container which should be manufactured is extruded, and this laminated parison of a molten state is blow molded metal It can be obtained by setting in a mold and molding into a desired container shape by blow molding.
- the pinch-off part is not illustrated in FIG. 1, it is appropriately provided at the bottom of the container.
- it can be formed by a punch or a drill after the blow molded body is taken out from the mold.
- the laminated peeling container 1 obtained by blow molding may be filled with the contents as it is, or after the preliminary peeling before filling the contents, the contents may be filled.
- the preliminary peeling is performed, for example, by injecting air between the outer layer 3 and the inner layer 5 from an air introduction hole provided in the outer layer 3 or between the outer layer 3 and the inner layer 5. This can be performed by forcibly injecting air between the outer layer 3 and the inner layer 5 from the interface P.
- the cylindrical portion is integrally formed so as to extend further from the tip of the container mouth portion when the container is formed.
- the inner layer 5 includes an EVOH layer 5a, an outer barrier layer 5f provided on the container outer surface side of the EVOH layer 5a, an inner barrier layer 5g provided on the container inner surface side of the EVOH layer 5a, An inner surface layer 5d provided on the inner surface side of the inner barrier layer 5g is provided.
- the outer barrier layer 5f and the inner barrier layer 5g have a function of reducing the contact between the EVOH layer 5a and air by covering the EVOH layer 5a.
- the barrier layers are provided on both sides of the EVOH layer 5a. Thus, the EVOH layer 5a is prevented from coming into contact with air.
- the outer barrier layer 5f is not provided on the outer surface side of the EVOH layer 5a, and the air that has entered the space 9 between the outer layer 3 and the inner layer 5 is the EVOH layer. It was the structure which contacts 5a directly. For this reason, when the delamination container 1 is used in a high-humidity environment, the EVOH layer 5a is denatured by water vapor contained in the air, and its oxygen barrier property is lowered. According to the present embodiment, such modification of the EVOH layer 5a due to water vapor can be suppressed.
- the EVOH layer 5a preferably contains an oxygen absorbent.
- the oxygen barrier property of the EVOH layer 5a can be further improved.
- an oxygen absorbent when used for the EVOH layer 5a, an odorous substance is generated by a reaction when the EVOH layer 5a absorbs oxygen.
- the EVOH layer 5a When barrier layers are provided on both sides of the odorant, the release of the odorous substance to the outside is suppressed.
- the outer barrier layer 5f and the inner barrier layer 5g only need to inhibit the contact between the EVOH layer 5a and the air, and are made of, for example, polyolefin.
- an acid-modified polyolefin in which a carboxyl group is introduced into the polyolefin eg, maleic anhydride-modified polyethylene
- examples of the polyolefin include low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, and mixtures thereof.
- An example of the outer barrier layer 5f is a mixture of low density polyethylene and acid-modified polyethylene
- an example of the inner barrier layer 5g is ethylene vinyl acetate copolymer (EVA), low density polyethylene, linear low density polyethylene, or , Low density polyethylene or a mixture of linear low density polyethylene and acid-modified polyethylene.
- the outer barrier layer 5f is preferably an ethylene vinyl acetate copolymer (EVA).
- An inner surface layer 5d is provided on the inner surface side of the inner barrier layer 5g.
- the inner surface layer 5d is made of the above-described polyolefin, for example, and linear low density polyethylene is preferable.
- the inner barrier layer 5g also functions as an adhesive layer between the EVOH layer 5a and the inner surface layer 5d.
- the inner layer 5 includes an outer EVOH layer 5e on the container outer surface side of the outer barrier layer 5f in addition to the configuration of the second embodiment.
- the outer barrier layer 5f is located at the outermost layer of the inner layer 5, in order to improve the adhesion between the outer barrier layer 5f and the EVOH layer 5a, acid-modified polyolefin is added to the outer barrier layer 5f.
- the adhesion between the outer barrier layer 5f and the outer layer 3 is also increased, and there arises a problem that the inner layer 5 is difficult to peel from the outer layer 3.
- the outer EVOH layer 5e is provided on the outer surface side of the outer barrier layer 5f so that the outer barrier layer 5f does not come into contact with the outer layer 3 so that the peelability between the inner layer 5 and the outer layer 3 is improved. It is increasing.
- the outer EVOH layer 5e is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin and has an excellent oxygen barrier property. For this reason, the deterioration of the EVOH layer 5a is further suppressed by providing the outer EVOH layer 5e.
- the ethylene contents of the outer EVOH layer 5e and the EVOH layer 5a may be the same or different. For example, by making the ethylene content of the EVOH layer 5a lower than the ethylene content of the outer EVOH layer 5e, the oxygen barrier property of the EVOH layer 5a can be enhanced and the peelability from the outer layer 3 can be enhanced.
- a laminated peeling container having a main body part and a mouth part was produced by blow molding under the following conditions.
- Layer structure Outer layer Polypropylene (manufactured by Sumitomo Chemical, model: FSX16E9)
- Inner layer Three-layer structure of outermost layer / adhesive layer / inner surface layer in order from the outer layer side
- Outermost layer Resin shown in Table 1
- a melted laminated parison is prepared by co-extrusion of each molten resin so as to have the above layer structure, and the molten laminated parison is set in a blow molding die. To form a desired container shape.
- the coextrusion conditions were adjusted so that both the outer layer and inner layer thicknesses were in the range of 70 to 130 ⁇ m and the outer layer / inner layer thickness ratio was 0.8 to 1.3.
- the blow molding conditions were blow pressure: 0.4 MPa, mold temperature: 25 ° C., and blow time: 15 seconds.
- the T-type peel strength was measured using a peel strength tester (manufactured by Shinto Kagaku Co., Ltd., HEIDON-17 type) for the laminate peel container prepared under the above conditions. Specifically, a strip of 15 mm (circumference) ⁇ 100 mm (height) is cut out from the produced container, and as shown in FIG. 3, the outer layer and the inner layer are formed at a test speed of 200 mm / min so that the strip becomes T-shaped. It was peeled 40-50 mm.
- An example of the relationship between the distance and the load at the time of peeling is a graph shown in FIG. 4, and the average strength ignoring the initial rising strength is defined as “standard peel strength”. The results are shown in Table 1.
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Abstract
Description
ところで、積層剥離容器は、通常、内容物を収容するための本体部と、内容物を排出するための口部とで構成されるが、本体部においては内層が外層からスムーズに剥離する一方で、口部においては内層が外層から剥離することを防ぎたいという要求がある。
しかし、本発明者が検討を行ったところ、積層剥離容器の使用環境によっては、酸素バリア性が低下して内容物が劣化してしまう場合があることに気が付いた。
本発明の第1観点によれば、内容物を収容する本体部と、前記本体部から前記内容物を排出する口部とを備え、且つ前記本体部及び前記口部が外層と内層とを備え、内容物の減少に伴って前記内層が前記外層から剥離し収縮する積層剥離容器であって、前記内層は、標準剥離強度が7~12g/15mmである層を最外層に備える、積層剥離容器が提供される。
好ましくは、前記最外層が、EVOH層である。
好ましくは、前記EVOH層は、酸素吸収剤を含有する。
好ましくは、前記EVOH層は、エチレン含有量が30mol%以下である。
好ましくは、前記外層は、ポリプロピレン層を最内層に備える。
本発明の第2観点によれば、外層と内層とを備え、内容物の減少に伴って前記内層が前記外層から剥離し収縮する積層剥離容器であって、前記内層は、EVOH層と、前記EVOH層の容器外面側に設けられた外側バリア層と、前記EVOH層の容器内面側に設けられた内側バリア層とを備える、積層剥離容器が提供される。
そして、EVOH層の両側にバリア層を設けることによってEVOH層の酸素バリア性の低下が抑制され、それによって内容物の劣化が抑制されることを見出し、本発明の完成に到った。
好ましくは、前記EVOH層は、酸素吸収剤を含有する。
好ましくは、前記外側バリア層の容器外面側に外側EVOH層をさらに備える。
図1(a)~(b)に示すように、本発明の第1実施形態の積層剥離容器1は、円筒状の胴部と底部とで構成される本体部1aと、内容物の充填及び排出を行うための口部1bとを備える。口部1bには、雄ネジ部1cが設けられている。雄ネジ部1cには、雌ねじを有するキャップやポンプなどが取り付けられる。尚、ねじでキャップを取り付ける場合に限らず打栓キャップを用いてもよい。
以下、図5を用いて、本発明の第2実施形態について説明する。本実施形態は、第1実施形態に類似しており、内層5の構成の違いが主な相違点である。以下、相違点を中心に説明する。
尚、EVOH層5aとの接着性、及び、外層3との間の剥離性を考慮すると、外側バリア層5fとしてはエチレン酢酸ビニル共重合体(EVA)が好ましい。
内側バリア層5gの容器内面側には内面層5dが設けられる。内面層5dは、例えば、上述したポリオレフィンからなり、直鎖状低密度ポリエチレンが好ましい。内側バリア層5gは、EVOH層5aと内面層5dの間の接着層としても機能する。
以下、図6を用いて、本発明の第3実施形態について説明する。本実施形態は、第1実施形態に類似しており、内層5の構成の違いが主な相違点である。以下、相違点を中心に説明する。
以下に示す条件で、本体部及び口部を有する積層剥離容器をブロー成形により作製した。
(1)容器形状
本体部:φ47mm、高さ110mm
口部:φ30mm、高さ16mm
外層:ポリプロピレン(住友化学製、型式:FSX16E9)
内層:外層側から順に最外層/接着層/内面層の三層構成
最外層:表1に示す樹脂
接着層:接着成分(三菱化学製、型式:モディックL522):LLDPE(日本ポリエチレン製、型式:ハーモレックスF325N)=1:1
内面層:LLDPE(日本ポリエチレン製、型式:ハーモレックスF325N)
上記層構成になるよう各溶融した樹脂を共押出しすることにより、溶融状態の積層パリソンを作製し、この溶融状態の積層パリソンをブロー成形金型にセットし、ブロー成形法によって所望の容器形状に成形した。共押出の条件は、外層と内層の厚さがどちらも70~130μmの範囲内であり且つ外層/内層の厚さの比が0.8~1.3となるように調節した。ブロー成形の条件は、ブロー圧:0.4MPa、金型温度:25℃、ブロー時間:15秒とした。
上記条件で作製した積層剥離容器について、離着性強度試験機(新東科学株式会社製、HEIDON-17型)を用いT型剥離強度を測定した。具体的には、作製した容器から15mm(周)×100mm(高さ)の短冊を切り出し、図3に示すように、短冊がT字状になるように外層と内層を試験速度200mm/minで40~50mm剥離させた。この剥離時の距離と荷重の関係の一例が図4に示すグラフであり、初期立ち上がり強度を無視した平均強度を「標準剥離強度」とした。その結果を表1に示す。
(1)本体部の剥離性
上記条件で作製した積層剥離容器の本体部の外層に空気導入孔を形成し、この空気導入孔から外層と内層との間に空気を注入することによって予備剥離を行った。空気は、圧力0.3MPaで1.0秒注入した。この予備剥離後の本体部での剥離状態を目視観察し、以下の基準で評価した。
〇:剥離未完了面積が本体部の20%未満
×:剥離未完了面積が本体部の20%以上
上記予備剥離を行った後、空気導入孔を閉鎖した状態で、容器を約30kgの力で潰して、外層と内層との間の空気に圧力をかけたときに、口部における外層と内層との界面から空気が漏れるかどうか確認した。尚、比較例4については予備剥離できなかったため、口部の耐剥離性の確認は行っていない。
<口部の耐剥離性>
〇:口部界面からの空気漏れなし
×:口部界面からの空気漏れあり
SF7503B:日本合成製、EVOH樹脂
AP461:クラレ製、EVOH樹脂
EV3010N:日本ゼオン製、EVOH樹脂
DC3212B:日本合成製、EVOH樹脂
D2908:日本合成製、EVOH樹脂
ST230:日本合成製、EVOH樹脂
F108-1:住友化学製、LDPE樹脂
表1に示すように、標準剥離強度が7~12g/15mmである実施例1~3では、本体部の剥離性及び口部の耐剥離性の両方において優れた結果が得られた。一方、標準剥離強度が7g/15mm未満である比較例1~3では、口部の耐剥離性が十分でなかった。また、標準剥離強度が12g/15mmを超える比較例4では、本体部の剥離性が悪かった。
Claims (8)
- 内容物を収容する本体部と、前記本体部から前記内容物を排出する口部とを備え、且つ前記本体部及び前記口部が外層と内層とを備え、内容物の減少に伴って前記内層が前記外層から剥離し収縮する積層剥離容器であって、
前記内層は、標準剥離強度が7~12g/15mmである層を最外層に備える、積層剥離容器。 - 前記最外層が、EVOH層である、請求項1に記載の積層剥離容器。
- 前記EVOH層は、酸素吸収剤を含有する、請求項2に記載の積層剥離容器。
- 前記EVOH層は、エチレン含有量が30mol%以下である、請求項2又は請求項3に記載の積層剥離容器。
- 前記外層は、ポリプロピレン層を最内層に備える、請求項1~請求項4の何れか1つに記載の積層剥離容器。
- 外層と内層とを備え、内容物の減少に伴って前記内層が前記外層から剥離し収縮する積層剥離容器であって、
前記内層は、EVOH層と、前記EVOH層の容器外面側に設けられた外側バリア層と、前記EVOH層の容器内面側に設けられた内側バリア層とを備える、積層剥離容器。 - 前記EVOH層は、酸素吸収剤を含有する、請求項6に記載の積層剥離容器。
- 前記外側バリア層の容器外面側に外側EVOH層をさらに備える、請求項6又は請求項7に記載の積層剥離容器。
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