WO2022045248A1 - Récipient en plastique - Google Patents

Récipient en plastique Download PDF

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Publication number
WO2022045248A1
WO2022045248A1 PCT/JP2021/031357 JP2021031357W WO2022045248A1 WO 2022045248 A1 WO2022045248 A1 WO 2022045248A1 JP 2021031357 W JP2021031357 W JP 2021031357W WO 2022045248 A1 WO2022045248 A1 WO 2022045248A1
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WO
WIPO (PCT)
Prior art keywords
layer
resin
container
plastic container
mass
Prior art date
Application number
PCT/JP2021/031357
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English (en)
Japanese (ja)
Inventor
朋英 亀谷
良太 小玉
大輔 山嵜
Original Assignee
キョーラク株式会社
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Filing date
Publication date
Application filed by キョーラク株式会社 filed Critical キョーラク株式会社
Publication of WO2022045248A1 publication Critical patent/WO2022045248A1/fr

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    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/40—Details of walls
    • B65D1/42—Reinforcing or strengthening parts or members

Definitions

  • the present invention relates to a plastic container.
  • Patent Document 1 discloses a plastic container for accommodating contents such as dressing.
  • Patent Document 1 it is assumed that the container is tilted and the contents are discharged by the weight of the contents.
  • a polypropylene (hereinafter referred to as “PP”) polymer is used in order to increase the rigidity of the container. It is generally composed of a resin mainly composed of polypropylene.
  • the present invention has been made in view of such circumstances, and provides a plastic container in which scratches are less likely to be formed on the outer layer and buckling deformation is suppressed.
  • a plastic container including an outermost layer and a repro layer, wherein the repro layer is arranged inside the plastic container rather than the outermost layer, and the outermost layer contains low-density polyethylene, said.
  • the repro layer is composed of a mixed resin composed of a recycled resin and a virgin resin, the recycled resin is a resin obtained by regenerating the scrap generated during molding of the container, and the virgin resin is a polypropylene-based polymer.
  • a plastic container containing linear low density polyethylene is provided.
  • the plastic container described above is a plastic container containing 15 to 50% by mass of the recycled resin and 50 to 85% by mass of the virgin resin.
  • the plastic container described above is a plastic container containing 50 to 90% by mass of the polypropylene-based polymer and 10 to 50% by mass of the linear low-density polyethylene.
  • it is the plastic container described above, wherein the mass ratio of (the linear low-density polyethylene / the polypropylene-based polymer) in the virgin resin is 0.3 to 0.6. ..
  • the above-mentioned plastic container is a plastic container including the innermost layer arranged inside the plastic container rather than the repro layer, and the innermost layer contains low-density polyethylene.
  • FIG. 1 It is a front view which shows the plastic container 1 and the cap 13. It is a layer block diagram of the plastic container 1.
  • FIG. 1 shows a schematic view of a plastic container 1 according to an embodiment of the present invention.
  • the container 1 is a container for accommodating the contents. In this container, it is assumed that the container 1 is tilted and the contents are discharged by the weight of the contents. Examples of the contents include liquid substances such as dressings.
  • the container 1 discharges the contents from the mouth portion 12 on which the engaging portion 11 and the support ring 14 are formed.
  • a cap 13 is attached to the mouth portion 12.
  • the cap 13 is, in one example, a plug type and has an engaging portion 15 engaged with the engaging portion 11.
  • the cap 13 is supported by the support ring 14, the cap 13 is pressed against the container 1 with the cap 13 covered with the mouth portion 12, and the engaging portion 15 is engaged with the engaging portion 11. It can be attached by letting it.
  • the cap 13 is a plug type, a large load is applied to the container 1 when the cap 13 is attached, and the container 1 is likely to buckle and deform. Therefore, the technical significance of adopting the present invention when the cap 13 is a plug type is particularly remarkable.
  • the container 1 is a blow molded body formed by blow molding. The details of blow molding will be described later.
  • the wall thickness at the center of the container 1 in the height direction is, for example, 0.5 to 2 mm, preferably 0.7 to 1.5 mm. Since it is assumed that the container 1 is tilted and the contents are discharged by the weight of the contents, it is preferable that the container 1 is thicker than the squeeze type container. Specifically, the wall thickness is, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4. , 1.5, 1.6, 1.7, 1.8, 1.9, 2.0 mm, and may be within the range between any two of the numerical values exemplified here.
  • the capacity of the container 1 is, for example, 300 to 2000 mL, preferably 500 to 1500 mL, and preferably 700 to 1200 mL. Since the container 1 is more likely to buckle and deform as the capacity is large, the technical significance of adopting the present invention is particularly remarkable when the capacity is large. Specifically, this capacity is, for example, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 2000 mL, and any two of the numerical values exemplified here. It may be within the range between.
  • the tensile elastic modulus of the container 1 is, for example, 600 to 1000 MPa, specifically, 600, 650, 700, 750, 800, 850, 900, 950, 1000 MPa, and any two of the numerical values exemplified here. It may be within the range between the two.
  • the container 1 has a multi-layer structure.
  • FIG. 2 is an example of the layer structure of the container 1, in which the innermost layer 2, the repro layer 3, the adhesive resin layer 4, the barrier layer 5, and the adhesive resin layer 6 are the most in order from the inner surface side of the container 1.
  • the outer layer 7 is provided.
  • the repro layer 3 is arranged inside the container 1 with respect to the outermost layer 7.
  • the innermost layer 2 is arranged inside the container 1 with respect to the repro layer 3.
  • the layer structure of the container 1 may omit at least one of these layers, or may include yet another layer.
  • the ratio of the thickness of each layer is, for example, as follows.
  • the ratio of each layer may be in the range between any two of the numerical values listed in parentheses below.
  • Innermost layer 2 3 to 30% (3, 5, 10, 15, 20, 25, 30%)
  • Repro layer 3 50-90% (50, 55, 60, 65, 70, 75, 80, 85, 90%)
  • Adhesive resin layer 4 0.3 to 5% (0.3, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.
  • Barrier layer 5 1-8% (1, 2, 3, 4, 5, 6, 7, 8%)
  • Adhesive resin layer 6 0.3 to 5% (0.3, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4. 5, 5.0%)
  • Outermost layer 7 3 to 30% (3, 5, 10, 15, 20, 25, 30%)
  • the innermost layer 2 is a layer in contact with the contents and is composed of a thermoplastic resin.
  • the thermoplastic resin is preferably polyolefin.
  • polyethylene (hereinafter, “PE”) or PP is preferably used, and PE is particularly preferable.
  • PE polyethylene
  • LDPE low density polyethylene
  • LLDPE LLDPE
  • the proportion of LDPE in the thermoplastic resin is, for example, 50 to 100% by mass, preferably 80 to 100% by mass. Specifically, this ratio is, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100% by mass, and is within the range between any two of the numerical values exemplified here. May be.
  • LDPE is polyethylene that is radically polymerized under a high pressure of 100 to 400 MPa.
  • LDPE can also be referred to as "high pressure polyethylene”.
  • the LDPE preferably has a specific gravity of 0.910 to 0.935, more preferably 0.920 to 0.925. Specifically, this specific gravity is, for example, 0.910, 0.915, 0.920, 0.925, 0.930, 0.935, and is within the range between any two of the numerical values exemplified here. May be.
  • LLDPE is polyethylene in which ethylene and ⁇ -olefin are polymerized using a transition metal catalyst such as a Cheegler catalyst or a metallocene catalyst.
  • LLDPE has a linear structure and can also be referred to as "linear polyethylene".
  • the ⁇ -olefin include 1-butene, 1-hexene, 4-methylpentene, 1-octene and the like.
  • LLDPE preferably has a specific gravity of 0.900 to 0.940, more preferably 0.905 to 0.930. Specifically, the specific gravity is, for example, 0.900, 0.905, 0.910, 0.915, 0.920, 0.925, 0.930, 0.935, and the numerical values exemplified here are used. It may be within the range between any two.
  • the outermost layer 7 is a layer arranged on the outermost side of the container and is made of a thermoplastic resin.
  • the description of the thermoplastic resin is the same as that of the innermost layer 2, and LDPE is preferable, and the description of the proportion of LDPE is the same as that of the innermost layer 2. Since the outermost layer 7 contains LDPE, scratches on the container 1 during packing and transportation are suppressed.
  • the repro layer 3 is arranged between the innermost layer 2 and the outermost layer 7.
  • the repro layer 3 is composed of a mixed resin composed of a recycled resin and a virgin resin. Assuming that the total amount of the mixed resin is 100% by mass, the mixed resin contains 15 to 50% by mass (15, 20, 25, 30, 35, 40, 45, 50% by mass) of the recycled resin and 50 to 85% by mass of the virgin resin. (50, 55, 60, 65, 70, 75, 80, 85% by mass) is preferably contained. In the case of such a formulation, the buckling deformation of the container 1 is particularly likely to be suppressed.
  • the ratio of the recycled resin and the virgin resin may be in the range between any two of the numerical values exemplified in parentheses.
  • the recycled resin is a resin obtained by regenerating the scrap generated during the molding of the container 1. Since the scrap contains all the layers of the container 1, the recycled resin is a mixture of the resin compositions constituting each of the all layers of the container 1.
  • the virgin resin is a new resin that is not a recycled resin and contains a PP polymer and LLDPE.
  • the PP-based polymer is a polymer containing a monomer unit derived from propylene.
  • the PP-based polymer may be, for example, a propylene homopolymer, a copolymer of propylene and another olefin, or a mixture containing a combination thereof.
  • the proportion of the monomer unit derived from propylene in the PP-based polymer may be, for example, 85% by mass or more, or 90% by mass or more, based on the mass of the PP-based polymer.
  • olefins other than propylene constituting the PP polymer examples include ethylene and ⁇ -olefin.
  • the ⁇ -olefin may have 4 to 8 carbon atoms, and specific examples thereof include 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene.
  • PP polymer examples include propylene-ethylene random copolymer, propylene-1-butene random copolymer, propylene-1-pentene random copolymer, propylene-1-hexene random copolymer, and propylene-1-.
  • the PP-based polymer is at least one polymer selected from the group consisting of a propylene-ethylene random copolymer, a propylene-ethylene-1-butene random copolymer, and a propylene-1-butene random copolymer. May be good.
  • the content of the monomer derived from ethylene may be 1% by mass to 10% by mass or 2% by mass to 7% by mass. good. These contents are calculated based on the mass of the copolymer.
  • the virgin resin contains 50 to 90% by mass (50, 55, 60, 65, 70, 75, 80, 85, 90% by mass) of PP polymer and 10 to 50% by mass of LLDPE. It is preferably contained in% by mass (10, 15, 20, 25, 30, 35, 40, 45, 50% by mass). In the case of such a formulation, the buckling deformation of the container 1 is particularly likely to be suppressed.
  • the ratio of the PP polymer and LLDPE may be in the range between any two of the numerical values exemplified in the above parentheses.
  • the mass ratio of (LLDPE / PP-based polymer) in the virgin resin is preferably 0.3 to 0.6. Specifically, this mass ratio is, for example, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, and any two of the numerical values exemplified here are used. It may be within the range between the two.
  • the virgin resin is a recovery aid (recovery aid that enhances the compatibility between EVOH and the PP polymer). It is preferable to include a compatibilizer).
  • the recovery aid include acid-modified polyolefins and the like.
  • the proportion of the recovery aid in the virgin resin is, for example, 0.5 to 10% by mass, preferably 1 to 5% by mass. Specifically, this ratio is, for example, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10% by mass, and is between any two of the numerical values exemplified here. It may be within the range.
  • the mixed resin contains 3 to 20% by mass (3, 5, 10, 15, 20% by mass) of LDPE and 45 to 90% by mass (45, 50, 55%) of the PP polymer. , 60, 65, 70, 75, 80, 85, 90% by mass) and 5 to 40% by mass (5, 10, 15, 20, 25, 30, 35, 40% by mass) of LLDPE.
  • LDPE is preferably derived from recycled resin. The proportion of each component may be in the range between any two of the numerical values exemplified in the above parentheses.
  • the barrier layer 5 is made of a resin having a high gas barrier property.
  • a resin having a high gas barrier property examples include ethylene vinyl alcohol copolymer (EVOH: ethylene vinyl acetate copolymer saken product and the like), aromatic polyamide and the like.
  • the adhesive resin layers 4 and 6 are made of an adhesive resin.
  • the adhesive resin include acid-modified polyolefins (eg, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene) and the like.
  • the adhesive resin layer 4 is preferably acid-modified polypropylene. Since the proportion of the PP polymer is high in the repro layer 3, the adhesiveness between the repro layer 3 and the barrier layer 5 can be enhanced by using the acid-modified polypropylene. By providing the adhesive resin layers 4 and 6, the adhesiveness between the barrier layer 5 and the outermost layer 7 or the repro layer 3 is improved. Instead of providing the adhesive resin layers 4 and 6, an adhesive resin may be blended in the barrier layer 5.
  • the container 1 can be formed by blow molding of a parison.
  • the blow molding may be direct blow molding or injection blow molding.
  • direct blow molding a container 1 is manufactured by sandwiching a tubular parison in a molten state extruded from an extruder between a pair of split dies and blowing air into the parison.
  • injection blow molding a test tubular bottomed parison called a preform is formed by injection molding, and blow molding is performed using this parison.
  • the layer structure of the parison is the same as the layer structure of the container 1.
  • the multi-layer parison can be formed by coextrusion molding, multi-layer injection molding, or the like.
  • the portion of the tubular parison in the cavity formed by the pair of split dies becomes the container 1, and the portion other than the container 1 becomes scrap.
  • This scrap contains the constituent materials of all the layers constituting the container 1.
  • a recycled resin can be obtained by subjecting this scrap to a recycling treatment such as pulverization.
  • Container 1 A container 1 (capacity 1000 mL) having the shape shown in FIG. 1 and the layer structure shown in FIG. 2 was manufactured.
  • the container 1 was manufactured by extruding the resin constituting each layer from the multilayer die head by coextrusion molding to form a tubular parison, and blow molding the tubular parison.
  • the wall thickness at the center of the container 1 in the height direction was 1 mm.
  • the thickness ratio of the outermost layer 7 / adhesive resin layer (maleic anhydride-modified polypropylene) 6 / barrier layer (EVOH) 5 / adhesive resin layer (maleic anhydride-modified polypropylene) 4 / repro layer 3 / innermost layer (LDPE) 2 is , In order, 8.1 / 2.0 / 3.0 / 2.0 / 68.9 / 16.0.
  • the outermost layer 7 was PP in Comparative Example 2 and LDPE in the other Examples / Comparative Examples.
  • composition of the mixed resin constituting the repro layer 3 As the composition of the mixed resin constituting the repro layer 3, a recycled resin (27% by mass), a virgin resin (70% by mass), and a recovery aid (Mitsubishi Chemical Soaredin RG500) (3% by mass) were used.
  • the recycled resin a resin obtained by crushing and cleaning scrap generated during molding of the container 1 was used.
  • ⁇ Measurement of tensile modulus> A tensile test (conditions: JIS K 7113 No. 2, 60 mm between chucks, test speed 50 mm / min) was performed using a test piece cut out from the body of the container 1 to determine the tensile elastic modulus.
  • ⁇ Packing / transportation test> Put 6 pieces of 1000 mL dressing filled in container 1 at 85 ° C in a special cardboard, put it on a truck in a state of stacking 5 layers, transport it for 1000 km, and then observe the appearance of the container in the bottom cardboard. , Scratch resistance and buckling deformation resistance were evaluated according to the following criteria.
  • Buckling deformation resistance The number of buckling-deformed containers is 0 ⁇ : The number of buckling-deformed containers is 1 ⁇ : The number of buckling-deformed containers is 2 ⁇ : The number of buckling-deformed containers Number is 3 or more
  • Plastic container 2 Innermost layer 3: Replo layer 4: Adhesive resin layer 5: Barrier layer, 6: Adhesive resin layer, 7: Outermost layer, 11: Engagement part, 12: Mouth part, 13: Cap, 14: Support ring, 15: Engagement part

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un récipient en plastique qui a une couche externe sur laquelle des rayures sont moins susceptibles d'être formées et des déformations par gauchissement sont inhibées.　Le récipient en plastique selon la présente invention est pourvu d'une couche externe et d'une couche de retraitement. La couche de retraitement est disposée dans le récipient en plastique à un emplacement situé à l'intérieur de la couche externe. La couche externe contient un polyéthylène basse densité. La couche de retraitement est constituée d'un mélange de résines composé d'une résine retraitée et d'une résine vierge. La résine retraitée est obtenue par retraitement de déchets générés pendant le moulage du récipient. La résine vierge contient un polymère de polypropylène et un polyéthylène basse densité à chaîne droite.
PCT/JP2021/031357 2020-08-31 2021-08-26 Récipient en plastique WO2022045248A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020146023A JP7485943B2 (ja) 2020-08-31 2020-08-31 プラスチック容器
JP2020-146023 2020-08-31

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WO2022045248A1 true WO2022045248A1 (fr) 2022-03-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023190296A1 (fr) * 2022-03-30 2023-10-05 キョーラク株式会社 Récipient en plastique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031171A1 (fr) * 2017-08-10 2019-02-14 東洋製罐株式会社 Récipient moulé par soufflage utilisé avec un film d'huile formé sur une surface intérieure
WO2019044678A1 (fr) * 2017-08-31 2019-03-07 キョーラク株式会社 Récipient de délaminage
JP2020070050A (ja) * 2018-10-31 2020-05-07 メビウスパッケージング株式会社 スクイズ容器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006305882A (ja) 2005-04-28 2006-11-09 Sanko Co Ltd 樹脂廃材の再利用方法および再利用樹脂製品
JP5817124B2 (ja) 2011-01-20 2015-11-18 キョーラク株式会社 プラスチック容器
JP6319546B2 (ja) 2013-04-30 2018-05-09 キョーラク株式会社 容器
JP7175631B2 (ja) 2018-04-27 2022-11-21 株式会社吉野工業所 二重容器
JP7083706B2 (ja) 2018-06-25 2022-06-13 株式会社吉野工業所 多層絞出し容器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031171A1 (fr) * 2017-08-10 2019-02-14 東洋製罐株式会社 Récipient moulé par soufflage utilisé avec un film d'huile formé sur une surface intérieure
WO2019044678A1 (fr) * 2017-08-31 2019-03-07 キョーラク株式会社 Récipient de délaminage
JP2020070050A (ja) * 2018-10-31 2020-05-07 メビウスパッケージング株式会社 スクイズ容器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023190296A1 (fr) * 2022-03-30 2023-10-05 キョーラク株式会社 Récipient en plastique

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JP7485943B2 (ja) 2024-05-17

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