WO2020130610A1 - Feuille composite présentant une excellente maniabilité et procédé de fabrication d'un contenant d'emballage la comprenant - Google Patents

Feuille composite présentant une excellente maniabilité et procédé de fabrication d'un contenant d'emballage la comprenant Download PDF

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Publication number
WO2020130610A1
WO2020130610A1 PCT/KR2019/017969 KR2019017969W WO2020130610A1 WO 2020130610 A1 WO2020130610 A1 WO 2020130610A1 KR 2019017969 W KR2019017969 W KR 2019017969W WO 2020130610 A1 WO2020130610 A1 WO 2020130610A1
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Prior art keywords
polyester
packaging container
film
foam sheet
composite sheet
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PCT/KR2019/017969
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English (en)
Korean (ko)
Inventor
허미
함진수
이광희
김우진
최종한
하상훈
Original Assignee
주식회사 휴비스
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Application filed by 주식회사 휴비스 filed Critical 주식회사 휴비스
Priority to JP2020543108A priority Critical patent/JP7125496B2/ja
Priority to CN201980020474.3A priority patent/CN111867831A/zh
Publication of WO2020130610A1 publication Critical patent/WO2020130610A1/fr

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    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0415—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the pressure of the material during or after filling of the mould, e.g. by local venting
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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

Definitions

  • the present invention relates to a method for manufacturing a composite sheet having excellent processability and a packaging container including the same.
  • Products used in ordinary food packaging containers are divided into foamed and non-foamed types.
  • a foamed food packaging container a product in which polystyrene is mixed with foam gas and extruded is used.
  • foam gas and extruded Such a product can maintain a relatively thick thickness, which is advantageous in maintaining shape, and has high thermal insulation and high price competitiveness.
  • a representative product that is most frequently used as a disposable heat-resistant container is a cup ramen container, and previously, a polystyrene foam container was used.
  • a polystyrene foam container it is an issue that harmful substances are detected at a high temperature, and this is replaced with a paper container, but the price is high.
  • the packaging container is manufactured by using a polyester resin as a resin foam, which is eco-friendly, lightweight, and high-strength, and has excellent durability in accordance with temperature changes.
  • the packaging container may include a polyester film on one surface of the resin foam, and may be printed on the outer surface of the polyester film to form a printing layer.
  • the stretched film subjected to stretching treatment was used as the polyester film, there was a problem in that the processability such as breaking of the molding sheet in the molding process of the packaging container was deteriorated.
  • the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a composite sheet having excellent processability and a packaging container including the same.
  • the present invention in order to achieve the above object, a polyester foam sheet having an average thickness of 0.9 to 10 mm; And a structure in which a polyester film having an average thickness of 15 to 200 ⁇ m formed on one side or both sides of a foam sheet is laminated, and the polyester film is a non-stretched film, and after being treated at a temperature of 200° C. for 30 seconds, the elongation is 200. It provides a composite sheet of 600%.
  • the present invention is the step of placing the composite sheet between the female mold and the male mold of the molding apparatus; And pressing and molding the female mold and the male mold, and the forming step provides a method of manufacturing a packaging container for setting the surface temperature of the female mold to 40 to 200°C.
  • the composite sheet according to the present invention can provide a composite sheet having an elongation of 200 to 600% at a temperature of 200°C by including a non-stretched polyester film on one or both sides of the polyester foam sheet.
  • FIG. 1 is a cross-sectional view of a composite sheet according to the present invention.
  • FIG. 2 is a view sequentially showing a packaging container manufacturing method according to the present invention.
  • FIG 3 is a view showing a packaging container manufactured by the packaging container manufacturing method according to the present invention.
  • non-stretched film is a non-stretched film, and may specifically refer to a film that has not been stretched in any direction other than mechanical extruding speed and has not been oriented, without stretching.
  • film may mean a wide range including a sheet form as well as a film form generally used in the art.
  • the elongation may be 200 to 600%.
  • the elongation means not the individual elongation of the foamed sheet or the unstretched film, but the total elongation of the composite sheet.
  • low-melting polyester powder is a kind of adhesive powder for laminating a foam sheet of a composite sheet and a polyester film, and is a copolymerized polyester powder having a low melting point (or softening point) of about 250°C or less, sometimes about 120 to 130°C. ).
  • the melting point and the softening point can be measured using a melting point measuring device and a softening point measuring device, respectively.
  • the present invention relates to a method for manufacturing a composite sheet having excellent processability and a packaging container including the same.
  • the composite sheet of the present invention may include a polyester film of an unstretched film, so that the elongation may be high, and may have excellent processability in manufacturing a packaging container.
  • the composite film includes a polyester foam sheet and a polyester film of the same component, there is a convenient advantage in recycling separation.
  • FIG. 1 is a cross-sectional view of a composite sheet according to the present invention.
  • the composite sheet 100 of the present invention the average thickness of 0.9 to 10 mm polyester foam sheet 101; And a structure in which a polyester film 102 having an average thickness of 15 to 200 ⁇ m formed on one or both sides of a foam sheet is laminated, and the polyester film 102 is a non-stretched film, and the composite sheet 100 is heated. After treating at 200° C. for 30 seconds, the elongation of the composite sheet 100 is 200 to 600%.
  • the average thickness may be, for example, an average value after measuring the thickness of 10 points on a sheet or film using a thickness gauge or the like.
  • the composite sheet 100 of the present invention by including the polyester film 102 on one or both sides of the polyester foam sheet 101, the surface smoothness can be improved, the printability is excellent, to realize a beautiful appearance after processing It has the effect.
  • the polyester film 102 can be printed to form an outer surface.
  • the polyester film 102 is not a foam sheet, but a polyester sheet or a non-stretched film.
  • the polyester film 102 is characterized in that it is a non-stretched film, and accordingly, it has an advantage of excellent processability when manufacturing a packaging container. Specifically, if a packaging container is manufactured using a stretched film, the stretched film is already stretched, and thus stretching is not facilitated even if heat is applied.
  • the composite sheet of the present invention has an advantage of excellent workability because it has an excellent elongation at high temperature using an unstretched film.
  • the packaging container means a food packaging container, and may be a disposable food packaging container.
  • the composite sheet 100 of the present invention includes the polyester foam sheet 101 and the polyester film 102 of the same component, there is a convenient advantage in recycling separation.
  • the polyester foam sheet 101 and the polyester film 102 of the present invention are polyester resins, and the polyester resins may include repeating units derived from an acid component and a diol component.
  • the polyester resin may be at least one selected from the group consisting of dicarboxylic acid components and glycol components or aromatic and aliphatic polyester resins synthesized from hydroxycarboxylic acids.
  • the polyester resin is, for example, polyethylene terephthalate (polyethylene terephthalate, PET), polybutylene terephthalate (polybutylene terephthalate, PBT), polylactic acid (polylactic acid, PLA), polyglycolic acid (PGA), It may be one or more selected from the group consisting of polyethylene adipate (PEA), polyhydroxyalkanoate (PHA), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN) have. Specifically, polyethylene terephthalate (PET) may be used in the present invention.
  • the polyester foam sheet 101 is a polyethylene terephthalate (PET) foam sheet
  • the polyester film 102 may be a polyethylene terephthalate (PET) film.
  • the composite sheet 100 includes a polyester foam sheet 101 and a polyester film 102 of the same component, there is a convenient advantage in recycling separation.
  • the polyester foam sheet 101 and the polyester film 102 may be laminated by a low-melting polyester powder (not shown), a solvent-based adhesive.
  • the composite film 100 of the present invention is composed of the polyester resin of the same component, as well as the polyester foam sheet 101 and the polyester film 102, as well as the components of the adhesive, it is possible to increase the adhesive strength of the foam sheet and the film, , As described above, there is a convenient advantage in recycling separation.
  • the low-melting-point powder can be completely or partially melted during the lamination process and then adhered to the two layers while being cured, and also can remain in whole or in part after lamination to maintain the bonding state of the two layers.
  • the density of the foam sheet may be an average of 50 to 700 kg / m3.
  • the density of the foam sheet is average 50 to 500 kg/m3, 50 to 300 kg/m3, 50 to 100 kg/m3, 100 to 700 kg/m3, 200 to 700 kg/m3, 300 to 700 kg/m3 , 500 to 700 kg/m 3, 300 to 600 kg/m 3 or 400 to 500 kg/m 3.
  • the foam sheet may break during processing of the packaging container because there are many bubbles in the foam sheet, H/D ⁇ 0.3 (H: depth of the receiving part, D: diameter of the opening)
  • H/D ⁇ 0.3 H: depth of the receiving part, D: diameter of the opening
  • efficiency such as compressive strength, heat resistance, or thermal barrier properties of the packaging container may be low.
  • the density of the foam sheet constituting the packaging container is preferably 50 to 700 kg/m3 on average, and accordingly, the foam sheet can realize improved compressive strength, heat resistance, and thermal barrier properties while satisfying a thin thickness.
  • the polyester film 102 may be a non-stretched film.
  • the non-stretched film is a non-stretched film, and specifically, may mean a film that is not stretched, which is not stretched in any direction other than the mechanical extrusion speed, and thus is not oriented.
  • the film may be a broad meaning including a sheet form as well as a film form generally used in the art.
  • the polyester film 102 on one or both sides of the polyester foam sheet 101, the surface smoothness can be improved, the printability is excellent, there is an effect that can realize a beautiful appearance after processing.
  • the polyester film 102 can be printed to form an outer surface.
  • the polyester film 102 may be an unstretched film, and the density of the unstretched film is 1,000 to 1,700 kg/m 3, 1,100 to 1,600 kg/m 3, 1,200 to 1,500 kg/m 3, 1,300 to 1,450 kg/m 3, It may be 1,350 to 1,400 kg/m 3 or 1,380 kg/m 3.
  • the tensile strength of the non-stretched film may be 15 kg/mm or less.
  • the tensile strength of the unstretched film is 1 to 15 kg/mm 2, 1 to 12 kg/mm 2, 1 to 10 kg/mm 2, 1 to 8 kg/mm 3, 1 to 6 kg/mm 3, 1 to 4 kg /mm2, 1 to 2 kg/mm2, 2 to 15 kg/mm2, 4 to 15 kg/mm2, 6 to 15 kg/mm2, 10 to 15 kg/mm2, 3 to 13 kg/mm2 or 5 to 11 kg/mm2 It can be mm2.
  • the tensile strength can be measured using a tensile strength tester under the conditions of specimen size height 70 mm ⁇ width 25 mm, test speed 50 mm/min, gap size 20 mm.
  • the average thickness of the polyester foam sheet 101 may be 0.9 to 10 mm, and the average thickness of the polyester film 102 may be 15 to 200 ⁇ m.
  • the average thickness of the polyester foam sheet 101 is 0.9 to 10 mm, 0.9 to 8 mm, 0.9 to 6 mm, 0.9 to 4 mm, 0.9 to 2 mm, 1 to 10 mm, 2 to 10 mm , 4 to 10 mm, 6 to 10 mm, 8 to 10 mm, 2 to 8 mm or 4 to 6 mm.
  • the average thickness of the polyester foam sheet 101 is too thin, a problem may occur in which the foam sheet 101 breaks when manufacturing a food container.
  • the average thickness of the polyester foam sheet 101 is too thick, even if a food container is manufactured, there is a problem in that the price is increased due to the thickness of the thick, and it is difficult to manufacture a food container of a desired shape when forming the food container. have.
  • the average thickness of the polyester film 102 is 15 to 200 ⁇ m, 15 to 150 ⁇ m, 15 to 100 ⁇ m, 15 to 80 ⁇ m, 15 to 60 ⁇ m, 15 to 50 ⁇ m, 15 to 40 ⁇ m, 40 to It may be 200 ⁇ m, 60 to 200 ⁇ m, 80 to 200 ⁇ m, 100 to 200 ⁇ m, 40 to 150 ⁇ m, 80 to 150 ⁇ m, 20 to 45 ⁇ m or 20 to 30 ⁇ m.
  • the thinner the polyester film 102 the better the moldability.
  • the polyester film 102 in a non-stretched state may be difficult to implement, and when the thickness is too thick, a problem that a price increases may occur.
  • the composite sheet 100 may be a composite sheet 100 in which a polyester foam sheet 101 and a polyester film 102 are laminated.
  • the composite sheet 100 may be formed by a process of laminating a polyester film 102 on a polyester foam sheet 101 in which low-melting polyester powder or resin is dispersed or laminated on one surface, Or it may be formed by a process of laminating a polyester foam sheet 101 on a polyester film 102 in which low-melting polyester powder or resin is dispersed or laminated on one surface.
  • the method of dispersing or laminating a low-melting polyester powder or resin may include spraying, placement, coating, adhesion, deposition, and the like.
  • the low melting point polyester powder or resin is a kind of adhesive powder or adhesive resin for laminating the foam sheet 101 and the polyester film 102 of the composite sheet 100 in the present invention, the composite sheet 100 ) Interposed between the polyester foam sheet 101 and the polyester film 102 performs a function of imparting an adhesive force between the polyester foam sheet 101 and the polyester film 102.
  • the low melting point polyester powder or resin is a copolymerized polyester powder or resin, and may mean a powder or resin having a low melting point (or softening point) of 250° C. or less, and sometimes about 120 to 130° C.
  • the low melting point polyester powder may include one or more resins (low melting point polyester resins) capable of realizing adhesion, and the resin may be molded into a powder form.
  • the low melting point polyester powder may be in the form of a powder of a polyester resin having a melting point of 180°C to 250°C or a softening point of 100°C to 150°C.
  • the melting point (Tm) of the low melting point polyester powder or resin may be 180°C to 250°C, or a melting point may not exist.
  • the melting point (Tm) may be 180 °C to 250 °C, 185 °C to 245 °C, 190 °C to 240 °C, 180 °C to 200 °C, 200 °C to 230 °C, 195 °C to 230 °C or not present.
  • the softening point of the low-melting polyester powder or resin may be 100 °C to 150 °C, specifically 100 °C to 130 °C, 118 °C to 128 °C, 120 °C to 125 °C, 121 °C to 124 °C, 124 °C to 128 °C or 119 °C to 126 °C.
  • the low melting point polyester powder or resin may have a glass transition temperature (Tg) of 50°C or higher.
  • Tg glass transition temperature
  • the glass transition temperature may be 50 °C to 80 °C, more specifically 61 °C to 69 °C, 60 °C to 65 °C, 63 °C to 67 °C, 61 °C to 63 °C, 63 °C to 65 °C, 65 °C to 67 °C or 62 °C to 67 °C.
  • the low-melting polyester powder or resin may have an intrinsic viscosity (I.V) of 0.5 to 0.75 dl/g.
  • the intrinsic viscosity (I.V) is 0.6 to 0.65 mm 2 /g, 0.65 to 0.7 mm 2 /g, 0.64 to 0.69 mm 2 /g, 0.65 to 0.68. dl/g, 0.67 to 0.75 dl/g, 0.69 to 0.72 dl/g, 0.7 to 0.75 dl/g or 0.63 to 0.67 dl/g.
  • the low-melting polyester powder or resin according to the present invention may include repeating units represented by Chemical Formula 1 and Chemical Formula 2. Through this, the melting point (Tm), the softening point, and the glass transition temperature (Tg) can be adjusted to the above range, and the resin whose physical properties are adjusted to the above range can exhibit excellent adhesion.
  • the low-melting polyester powder or resin according to the present invention may have a structure including repeating units represented by Chemical Formulas 1 and 2.
  • the repeating unit represented by Formula 1 represents a repeating unit of polyethylene terephthalate (PET), and the repeating unit represented by Formula 2 performs a function of improving the tearing property of the polyester resin containing the repeating unit of polyethylene terephthalate (PET). do.
  • the repeating unit represented by Chemical Formula 2 includes a methyl group (-CH 3 ) as a side chain in the propylene chain bonded to terephthalate to increase the degree of freedom of the main chain by securing a space for the main chain of the polymerized resin to rotate and
  • the melting point (Tm) may be lowered by inducing a decrease in crystallinity of the resin. This may exhibit the same effect as when using isophthalic acid (IPA) containing an asymmetric aromatic ring to lower the melting point (Tm) of a conventional crystalline polyester resin.
  • IPA isophthalic acid
  • the polyester resin may include a repeating unit of Formula 2 that lowers the melting point (Tm) of the resin as a main repeating unit together with a repeating unit of Formula 1 including an ester repeating unit.
  • the low-melting polyester resin of the present invention when the molar fraction of the total resin is 1, may include repeating units represented by Formulas 1 and 2 as 0.5 to 1, specifically 0.55 to 1, 0.6 to 1, 0.7 to 1, 0.8 to 1, 0.5 to 0.9, 0.5 to 0.85, 0.5 to 0.7, or 0.6 to 0.95.
  • the average weight per unit area of the low-melting polyester powder or resin may range from 10 to 50 g/m 2, specifically, the average weight per unit area of the polyester resin powder is 10 to 40 g/m 2, It may range from 10 to 30 g/m2, 10 to 20 g/m2, 20 to 50 g/m2, 30 to 50 g/m2, 40 to 50 g/m2, or 20 to 40 g/m2.
  • the present invention by controlling the average weight per unit area of the low-melting polyester powder to the above range, while preventing excessive weight increase of the composite sheet, it is possible to implement a suitable adhesive performance in the weight range of the polyester foam sheet and the polyester film described above. There is, it is possible to suppress the peeling between the polyester foam sheet and the polyester film.
  • the average particle diameter of the low-melting polyester powder may range from 1 to 5 ⁇ m, specifically, the average particle diameter of the polyester resin powder is 1 to 4 ⁇ m, 1 to 3 ⁇ m, 1 to 2 ⁇ m, and 2 to 5 ⁇ m. , 3 to 5 ⁇ m, 4 to 5 ⁇ m, or 2 to 4 ⁇ m.
  • the present invention can be evenly dispersed when dispersed on the surface of the foam sheet 101 or the film 102 by controlling the average particle diameter of the low melting point polyester powder to the above range.
  • the polyester foam sheet 101 of the composite sheet 100 according to the present invention may exhibit excellent processability by including calcium carbonate.
  • the polyester foam sheet 101 may include 0.5 to 9% by weight of calcium carbonate (CaCO 3 ).
  • the calcium carbonate (CaCO 3 ) is an inorganic particle, and by including the inorganic particles as described above, the foamed sheet 101 of the present invention has a uniform sheet surface and may exhibit excellent thermoformability.
  • the thermal conductivity of the calcium carbonate may be 1 to 3 kcal/mh °C. Specifically, the thermal conductivity of calcium carbonate may be 1.2 to 2.5 kcal/mh°C, 1.5 to 2.2 kcal/mh°C, or 1.8 to 2 kcal/mh°C. More specifically, the thermal conductivity of calcium carbonate may be 1.5 to 2.5 kcal/mh°C or 1.8 to 2.3 kcal/mh°C. As described above, the foamed sheet containing calcium carbonate has a uniform surface by exhibiting excellent thermal conductivity, and can exhibit excellent thermoformability.
  • the content of the calcium carbonate may be 0.5 to 9% by weight relative to the total weight of the foam sheet composition.
  • the content of calcium carbonate is 0.5 to 8% by weight, 0.6 to 7% by weight, 0.7 to 6% by weight, 0.8 to 5% by weight, 0.9 to 4% by weight, 1 to 3% by weight, 2 to 3.5% by weight Can.
  • it may be 1% by weight or 3% by weight.
  • the polyester foam sheet 101 of the composite sheet 100 includes calcium carbonate, and the polyester film 102 is formed of a non-stretched film, and thus can have excellent elongation.
  • the composite sheet 100 according to the present invention is characterized in that the elongation is 200 to 600% after being treated at a temperature of 200°C for 30 seconds.
  • the elongation of the composite sheet 100 may be 250 to 550%, 300 to 500%, 350 to 450%, or 370 to 430%.
  • the present invention provides a method for manufacturing a packaging container.
  • the present invention provides the composite sheet 100 of the female mold 21 and the male mold 22 of the molding apparatus. Placing between; And forming a packaging container by pressing the female mold 21 and the male mold 22, wherein the forming step includes setting the surface temperature of the female mold 21 to 40 to 200°C. (10) is provided.
  • the composite sheet 100 may be a composite sheet in which a polyester foam sheet and a polyester film are laminated.
  • the manufacturing method of the composite sheet 100 is not particularly limited, but may be manufactured through thermal fusion or thermal bonding under pressure and heating conditions. More specifically, a polyester powder or resin having a melting point of 180 to 250°C or a softening point of 100 to 150°C on one side may be formed by a process of laminating a polyester film on a dispersed or laminated polyester foam sheet. .
  • the laminating step is controllable in a range in which the polyester resin powder is melted or softened.
  • the laminating step may be performed in a temperature range of 100 to 250°C. Specifically, 100 to 220 °C, 100 to 200 °C, 100 to 150 °C, 150 to 250 °C, 180 to 250 °C, 190 to 240 °C, 200 to 230 °C, 140 to 190 °C, 170 to 190 °C, 175 to It may be performed through compression at a temperature of 185°C, 160 to 180°C, or 165 to 175°C for 1 to 3 minutes.
  • a pressure higher than atmospheric pressure is applied. It can be molded into a desired shape while simultaneously applying heat and pressure.
  • the range of the applied pressure is not particularly limited, and may be, for example, 1.5 to 10 atm or 2 to 5 atm.
  • the step of preheating the polyester film to a temperature of 150 °C to 250 °C may be further included.
  • 150 to 240 °C, 150 to 200 °C, 150 to 180 °C, 180 to 230 °C, 200 to 220 °C, 210 to 230 °C, 150 to 190 °C, 180 to 185 °C, 160 to 180 °C or 185 to It may be carried out by applying heat at a temperature of 195 °C for 1 to 60 seconds, 3 to 40 seconds or 5 to 20 seconds.
  • the polyester foam sheet may be prepared by dispersing a low melting point polyester powder on the surface of the polyester foam sheet.
  • it may include the step of laminating a polyester film or a polyester film having a melting point of 180°C to 250°C or a softening point of 100°C to 150°C in which the melted polyester powder or resin is dispersed or laminated to a preheated polyester foam sheet.
  • the composite sheet 100 disposed between the female mold 21 and the male mold 22 may be thermoformed to be molded into the packaging container 10.
  • the thermoforming include vacuum forming, pressure forming or vacuum pressure forming using a combination of vacuum forming and pressure forming, using a male mold (plug) or using the male mold 22, followed by vacuum and/or pressure forming. Thermoforming methods can be used.
  • FIG. 2(a) shows an arrangement step of placing the composite sheet 100 between the female mold 21 and the male mold 22 of the molding apparatus before molding the composite sheet 100.
  • FIG. 2(b) is a drawing showing a stretching process and a thermal process.
  • the male mold 22 is lowered to stretch the composite sheet 100, and vacuum suction from the female mold 21 is performed. Is molded into the cavity shape of the female mold 21, and heat is applied.
  • Fig. 2(c) shows that the composite sheet 100 being molded by pressing the male mold 22 and compressed air from the female mold 21 is molded into the shape of the male mold 22 to form a final molded product packaging container ( 10) is molded.
  • the molded packaging container 10 may be taken out by raising the male mold 22 after cooling.
  • the foam sheet included in the composite sheet 100 may use a foam sheet prepared by melting and extruding the polyester resin introduced into the extruder.
  • the manufacturing method of the packaging container may include a step of manufacturing a foam sheet, and in one example, the step of manufacturing a polyester foam sheet includes a foaming process of foaming a polyester resin to produce a foam sheet. can do.
  • the foaming process can be performed using various types of extruders.
  • the foaming process can be carried out largely through bead foaming or extrusion foaming, extrusion foaming being preferred.
  • the extrusion foaming can continuously extrude and foam the resin melt, thereby simplifying the process steps, enabling mass production, preventing cracking between beads and granular destruction when foaming, and thus providing superior compressive strength. Can be implemented.
  • the additive may be introduced in the fluid connection line or in the foaming process.
  • the additive may have a barrier performance, hydrophilicity, water resistance, etc., specifically, thickener, surfactant, hydrophilic agent, heat stabilizer, waterproofing agent, cell size expander, infrared attenuator, plasticizer, fire retardant chemical, Pigments, elastomers, extrusion aids, antioxidants, nucleating agents, anti-static agents and UV absorbers.
  • a thickener in the method for manufacturing a foam sheet of the present invention, one or more of a thickener, a nucleating agent, a heat stabilizer, and a foaming agent may be added, and one or more of the functional additives listed above may be further included.
  • a thickener for example, in the step of manufacturing the foam sheet of the present invention, a thickener, a hydrophilic agent, a heat stabilizer, a waterproofing agent, a cell size expander, an infrared attenuator, a plasticizer, a fire retardant chemical, a pigment, an elastic polymer, an extrusion aid, an antioxidant,
  • additives selected from the group consisting of anti-static agents and UV absorbers can be introduced into the fluid connection line.
  • additives not added in the fluid connection line can be added during the extrusion process.
  • the surface of the male mold 22 and the surface temperature of the cavity of the female mold 21 may be different.
  • the surface temperature of the female mold 21 may be 40 to 200°C, for example, 40 to 180°C, 40 to 150°C, 40 to 120°C, 40 to 100°C, 40 to 80°C, 40 It may be from 60 to 60 °C, 60 to 200 °C, 80 to 200 °C, 100 to 200 °C or 150 to 200 °C.
  • the surface temperature of the male mold 22 may be 20 to 200°C, for example, 20 to 180°C, 20 to 150°C, 20 to 120°C, 20 to 100°C, 20 to 80°C, 20 to It may be 60 °C, 60 to 200 °C, 80 to 200 °C, 100 to 200 °C or 150 to 200 °C.
  • the surface temperature of the male mold 22 may be 110°C
  • the surface temperature of the female mold 21 may be 145°C.
  • the male mold 22 is preferably contacted or pressed into the female mold 22 for 0.5 to 40 seconds, 1 to 30 seconds, 3 to 20 seconds or 5 to 15 seconds.
  • the female mold 21 may have a structure in which a decompression hole 23 for decompressing a cavity that is an internal space is formed on one side.
  • the manufacturing method of the packaging container according to the present invention may further include the step of cooling the molded packaging container in a temperature range of -10 to 20 °C. More specifically, the temperature of the cooling step is -5 to 18 °C, -1 to 17 °C, 1 to 16 °C, 2 to 15 °C, 3 to 14 °C, 4 to 13 °C, 5 to 12 °C, 6 to 11 It may be °C or 10 °C.
  • the crystallinity of the polyester resin foam sheet can be formed in a range of 10 to 35%.
  • the crystallinity of the polyester resin foam sheet is prevented from excessively increasing, so that the packaging of the packaging container in the mold can be easily performed, and a packaging container having excellent light weight and heat resistance can be manufactured. .
  • the packaging container 10 may include a receiving portion and an opening.
  • the receiving portion is a receiving space (inner space) of the packaging container 10, and may mean a space surrounded by the bottom portion 11 and the wall portion 12.
  • the opening may mean a portion opened at the top of the packaging container 10.
  • H represents the depth of the receiving portion, 1 to 15 cm
  • D represents the diameter of the opening.
  • the value of H/D may be 0.01 to 2, specifically, the range of H/D is 0.01 to 1.5, 0.01 to 1.2, 0.01 to 1.0, 0.01 to 0.8, 0.01 to 0.6, 0.01 to 0.4, 0.01 to 0.2, 0.2 to 2, 0.6 to 2, 1 to 2, 1.5 to 2, 0.6 to 1.2, 0.7 to 1.1, 0.8 to 1 or 0.85 to 0.95.
  • the packaging container 10 of the present invention is excellent in moldability and thus dip molding is possible.
  • the packaging container 10 can be manufactured, thereby exhibiting excellent processability.
  • the packaging container 10 includes a bottom portion 11; And extending upwardly along the circumference of the bottom portion 11, including a wall portion 12 with an open top, wherein the average thickness of the bottom portion 11 and the average thickness of the wall portion 12 are 2.0 mm, respectively. It may be: More specifically, the average thickness of the bottom portion 11 and the average thickness of the wall portion 12 may be 0.8 to 2.0 mm, 0.9 to 1.8 mm, 1.0 to 1.6 mm, 1.1 to 1.4 mm, or 1.2 to 1.3 mm, respectively. . On the other hand, when the thickness of the bottom portion 11 and the wall portion 12 of the packaging container 10 is in the above range, it is possible to prevent the strength and stiffness from being lowered while reducing weight.
  • the ratio (T a :T b ) of the average thickness T a of the bottom portion 11 and the average thickness T b of the wall portion 12 may be in the range of 1:0.9 to 1.1.
  • the ratio (T a :T b ) of the average thickness T a of the bottom portion 11 and the average thickness T b of the wall portion 12 is 1:0.9 to 1.05, 1:0.9 to 1.0, 1:0.9 to 0.95, 1:0.95 to 1.1, 1:0.95 to 1.0, or 1:0.97 to 0.99.
  • the packaging container 10 according to the present invention is manufactured by dip molding, the thickness of the bottom portion 11 and the wall portion 12 may be almost constant.
  • the compressive strength may be 4 to 25 kgf/cm 2.
  • the compressive strength is 4 to 22 kgf/cm 2, 4 to 18 kgf/cm 2, 4 to 15 kgf/cm 2, 4 to 10 kgf/ Cm2, 10 to 25 kgf/cm2, 15 to 25 kgf/cm2, or 10 to 15 kgf/cm2.
  • the compressive strength may be 12 kgf/cm 2 or 9 kgf/cm 2.
  • a flange 13 extending outward along the circumference of the wall portion 12 may be formed at an upper end of the wall portion 12.
  • the foam sheet 101 may be disposed inside, and the unstretched polyester film 102 may be disposed outside, and vice versa.
  • the composite sheet 100 may be composed of two or more layers.
  • the packaging container 10 may include a foam sheet 101 and a film 102 of polyester resin, and the polyester resin may be polyethylene terephthalate (PET) resin.
  • PET polyethylene terephthalate
  • the total elution amount of acetic acid, water and heptane should be 30 ppm or less, and antimony, germanium, terephthalic acid, isophthalic acid, acetaldehyde
  • the material should be non-detectable, and when measuring the residual specification, no volatile material should be detected.
  • the packaging container according to the present invention uses the polyester resin, which is an eco-friendly material, as described above, so that substances of concern described in the Standard and Specification Notice No. 2015-7 issued by the Ministry of Food and Drug Safety are issued. It can be adjusted within the allowable range.
  • packaging container 10 By manufacturing the packaging container 10 using a composite sheet using such a material, it is possible to provide an environmentally friendly packaging container 10.
  • the low melting point PET powder was dispersed on one surface of the PET foam sheet, and the prepared PET film was laminated thereon to prepare a composite sheet.
  • the low melting point PET powder was used that contains a polyester resin having a melting point of 180°C to 250°C or a softening point of 100°C to 150°C as a main component.
  • the upper heater is set to 400°C
  • the lower heater is set to 280°C
  • the residence time is 30 seconds, so that the surface temperature of the foam sheet is 160°C
  • a male mold Plug
  • the temperature was set to 60°C and the female mold temperature to 40°C and pressed for 10 seconds to prepare a container.
  • a cup container design with a H/D of the mold of 0.91, a depth (H) of the receiving part of 10.5 cm, and a diameter (D) of the opening was applied.
  • a packaging container was prepared by molding in the same manner as in Example 1, except that the thickness of the unstretched PET film was 50 ⁇ m.
  • a packaging container was prepared by molding in the same manner as in Example 1, except that the stretched PET film was used. Meanwhile, the stretched PET film was a biaxially stretched film, and specifically, a film having a tensile strength of 20 kg/mm 2.
  • a packaging container was prepared by molding in the same manner as in Example 1, except that an unstretched PP film was used instead of the unstretched PET film.
  • a cup container (H/D 0.91) molded from a polystyrene (PS) chemical foamed PS foam sheet (density 730 kg/m 3, thickness 1 mm) was purchased and compared.
  • PS polystyrene
  • the tensile strength tester was placed in the oven, the specimen size was set to 70 mm high ⁇ 25 mm wide, the test speed was 50 mm/min, the gap size was set to 20 mm, and the oven temperature was 200°C. It measured after staying for 30 seconds.
  • Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 High temperature elongation (%) 380 420 180 350 360
  • the composite sheet of the present invention was high temperature. It can be confirmed that the elongation is excellent.
  • the side/bottom thickness ratio was measured by measuring the thickness of the center portion of the side surface and the bottom surface, and then expressed as a ratio of the side surface thickness to the bottom surface (bottom) thickness.
  • the compressive strength was measured with the maximum load when the bottom surface of the food container was placed upward using a tensile strength tester and compressed at a test speed of 50 mm/min.
  • Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Molding Side/bottom thickness ratio 0.95 0.97 X (break) X (break) 0.95 Compressive strength (kgf/cm2) 5 7 - - 8
  • Example 1 and Example 2 were 0.9 or more, and the thickness ratio between the side and the bottom was similar.
  • the side/bottom thickness ratio of Comparative Example 2 is less than 0.8, and it can be seen that the bottom surface is slightly thicker than the side surface.
  • Comparative Example 1 the food packaging container was broken at the time of molding, so that the packaging container could not be manufactured.
  • Example 1 The dissolution of harmful substances in the food containers prepared in Example 1 and Comparative Example 3 was evaluated. Specifically, after heating the food container in an 800 W microwave oven for 5 minutes, the amount of hazardous substance dissolution was measured. Evaluation items and results are shown in Table 4 below.
  • Example 1 Comparative Example 3 standard Analysis standard Analysis Residual standard Volatile substances (styrene, toluene, ethylbenzene, isopropylene, n-propylbenzene) mg/kg - Non-detection ⁇ 5,000 412 (styrene) Dissolution standard 4% acetic acid mg/L ⁇ 30 Non-detection ⁇ 30 7 water ⁇ 30 Non-detection ⁇ 30 10 n-heptane ⁇ 30 Non-detection ⁇ 30 8
  • the food container according to the embodiment did not detect a volatile substance, and thus showed a result of satisfying the standards announced by the Ministry of Food and Drug Safety.
  • a large amount of styrene remained at 412 mg/kg.
  • 4% acetic acid and water did not elute.
  • 4% acetic acid and water were eluted. Therefore, it was confirmed that the food container according to the present application can significantly reduce the residual amount and the elution amount of harmful substances.

Landscapes

  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Wrappers (AREA)

Abstract

La présente invention concerne une feuille composite présentant une excellente maniabilité et un procédé de fabrication d'un contenant d'emballage la comprenant. Plus spécifiquement, la feuille composite comprend un film de polyester de coulée sur une surface ou les deux surfaces d'une feuille de mousse de polyester, et ainsi, par traitement à une température de 200 °C pendant 30 secondes, la feuille composite ayant un allongement de 200 à 600 % peut être fournie, et par conséquent, elle est avantageuse en ce que la maniabilité est excellente lors de la fabrication d'un contenant d'emballage.
PCT/KR2019/017969 2018-12-18 2019-12-18 Feuille composite présentant une excellente maniabilité et procédé de fabrication d'un contenant d'emballage la comprenant WO2020130610A1 (fr)

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JP2020543108A JP7125496B2 (ja) 2018-12-18 2019-12-18 加工性に優れた複合シートおよびこれを含む包装容器の製造方法
CN201980020474.3A CN111867831A (zh) 2018-12-18 2019-12-18 加工性优异的复合片及包括其的包装容器的制备方法

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CN111867831A (zh) 2020-10-30

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