CN111867831A - Composite sheet having excellent processability and method for producing packaging container comprising same - Google Patents

Composite sheet having excellent processability and method for producing packaging container comprising same Download PDF

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Publication number
CN111867831A
CN111867831A CN201980020474.3A CN201980020474A CN111867831A CN 111867831 A CN111867831 A CN 111867831A CN 201980020474 A CN201980020474 A CN 201980020474A CN 111867831 A CN111867831 A CN 111867831A
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China
Prior art keywords
polyester
packaging container
sheet
film
composite sheet
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CN201980020474.3A
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Chinese (zh)
Inventor
许娓
咸镇洙
李光熙
金宇镇
崔钟汉
河相勳
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Huvis Corp
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Huvis Corp
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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

Abstract

The present invention relates to a composite sheet having excellent processability and a method for manufacturing a packaging container including the same, and more particularly, to a composite sheet having an elongation of 200 to 600% after being processed at a temperature of 200 ℃ for 30 seconds by including an unstretched polyester film on one or both surfaces of a polyester foamed sheet, thereby having an advantage of excellent processability in manufacturing a packaging container.

Description

Composite sheet having excellent processability and method for producing packaging container comprising same
Technical Field
The present invention relates to a composite sheet having excellent processability and a method for producing a packaging container comprising the same.
Background
Products used as general food packaging containers are classified into foamed type and non-foamed type. The foamed food packaging container used is a product obtained by mixing and extruding polystyrene and a foaming gas, and since the thickness of the product can be kept thick, the foamed food packaging container has the advantages of being favorable for keeping the shape, heat insulation and high price competitiveness. Conversely, a disadvantage of such foam-type products is that hazardous substances can be detected at high temperatures.
The most common representative of disposable heat-resistant containers is a bowl-noodle container, and a polystyrene foam container has been used. However, in the case of the polystyrene foam container, detection of harmful substances at high temperature has been a topic, and a paper container is used instead of the detection, but the polystyrene foam container has a disadvantage of being expensive.
In addition, as the life of modern society becomes more convenient, the use of disposable products is increasing, and as the number of individual households increases, the demand for selling food and convenience food products is gradually increasing. Accordingly, there is an increasing demand for food packaging containers, and there is also an increasing demand for new container materials that can protect the food packaging containers from harmful substances and provide functions depending on the application.
In connection with this, food packaging container related companies are researching and developing food packaging containers having convenience, safety, environmental performance, and price competitiveness, and the present applicant has developed resin foams having excellent cold resistance, packaging containers including the same, and the like. The packaging container is produced using a polyester resin as a resin foam, and thus has the effect of being environmentally friendly, lightweight, high in strength and heat resistance, and excellent in durability with temperature change.
In order to form a printed layer or the like, the packaging container may include a polyester film on one surface of a resin foam, and the printed layer may be formed by printing on an outer surface of the polyester film. However, since a stretched film subjected to stretching treatment is used as the polyester film, there is a problem that processability is deteriorated such as a molded sheet being broken during molding of a packaging container.
Disclosure of Invention
Technical problem
The present invention has been made to solve the above problems, and an object of the present invention is to provide a composite sheet having excellent processability, and a method for producing a packaging container including the same.
Technical scheme
In order to achieve the above object, the present invention provides a composite sheet comprising: a polyester foamed sheet having an average thickness of 0.9mm to 10 mm; and a structure in which a polyester film having an average thickness of 15 to 200 [ mu ] m is laminated on one or both surfaces of the foamed sheet, wherein the polyester film is an unstretched film and has an elongation of 200 to 600% after being treated at a temperature of 200 ℃ for 30 seconds.
Further, the present invention provides a method for manufacturing a packaging container, the method comprising: disposing the composite sheet between a female mold and a male mold of a molding device; and a step of applying pressure to the female mold and the male mold to mold the female mold, wherein in the molding step, the surface temperature of the female mold is set to 40 ℃ to 200 ℃.
ADVANTAGEOUS EFFECTS OF INVENTION
The composite sheet of the present invention includes an unstretched polyester film on one or both sides of a polyester foamed sheet, and thus can provide a composite sheet having an elongation at a temperature of 200 ℃ of 200 c% to 600%.
Further, when a packaging container is produced using the composite sheet, there is an advantage of excellent processability.
Drawings
Fig. 1 is a cross-sectional view of a composite sheet of the present invention.
Fig. 2 is a view sequentially showing a manufacturing method of the packaging container of the present invention.
Fig. 3 is a view showing a packaging container manufactured by the manufacturing method of a packaging container of the present invention.
Detailed Description
While the invention is susceptible to various modifications and alternative embodiments, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.
However, the present invention is not limited to the specific embodiments, and all modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention are to be understood as included therein.
In the present invention, terms such as "including" or "having" should be understood to specify the presence of stated features, integers, steps, actions, structural elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, actions, structural elements, components, or groups thereof.
Therefore, the configuration shown in the embodiment described in the present specification is only the most preferable embodiment of the present invention and does not represent the entire technical idea of the present invention, and various equivalents and modifications that can replace them may exist at the time of the present application.
In the present invention, "unstretched film" means a film that is not stretched, and specifically may mean an unstretched film that is not stretched in any direction except for the mechanical extrusion speed, and therefore, does not impart orientation. In addition, "film" may be broadly defined to include not only a film shape generally used in the art to which the present invention pertains but also a sheet (sheet) shape.
In the present invention, "elongation" means the ratio at which a material is stretched when a material tensile test is performed, for example, assuming that the initial punctuation distance of a base material is I0Distance of punctuation after fractureIs separated to be I1The elongation may then be ═ I (I)1－I0)/I0X 100 (%). In particular, the composite sheet of the present invention may have an elongation of 200 to 600% after being treated at a temperature of 200 ℃ for 30 seconds. Here, the elongation does not mean the elongation of the foamed sheet or the unstretched film alone, but means the total elongation of the composite sheet.
In the present invention, "low-melting polyester powder" may mean a bonding powder for bonding the foamed sheet and the polyester film of the composite sheet, and as the copolyester powder, a powder having a low melting point (or softening point) of 250 ℃ or less, sometimes about 120 ℃ to 130 ℃. 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 composite sheet having excellent processability and a method for producing a packaging container comprising the same.
In addition, since the composite sheet of the present invention includes a polyester film of an unstretched film, elongation can be improved, and excellent processability can be obtained in the production of a packaging container. Further, the composite film includes a polyester foam sheet and a polyester film having the same composition, and thus has an advantage of being convenient in separation and recycling.
Hereinafter, the composite sheet of the present invention will be described in detail.
Fig. 1 is a cross-sectional view of a composite sheet of the present invention. Referring to fig. 1, the composite sheet 100 of the present invention may include: a polyester foam sheet 101 having an average thickness of 0.9mm to 10 mm; and a structure in which a polyester film 102 having an average thickness of 15 to 200 μm is bonded to one or both surfaces of a foamed sheet, wherein the polyester film 102 is an unstretched film, and the composite sheet 100 has an elongation of 200 to 600% after the composite sheet 100 is treated at a temperature of 200 ℃ for 30 seconds. The average thickness may be, for example, a value obtained by averaging the thicknesses of the sheet or film at the position 10 after measuring them with a thickness gauge or the like.
The composite sheet 100 of the present invention includes the polyester film 102 on one or both surfaces of the polyester foam sheet 101, so that surface smoothness can be improved, printability is excellent, and a beautiful effect can be achieved after processing. For example, when a food packaging container is prepared, printing may be performed such that the polyester film 102 forms an outer face.
The polyester film 102 is not a foamed sheet but a polyester sheet or an unstretched film. In particular, the polyester film 102 is an unstretched film, and thus has an advantage of excellent processability in the production of packaging containers. In particular, when a packaging container is produced using a stretched film, since the stretched film is in a stretched state, it is not easily stretched even if heat is applied. However, the composite sheet of the present invention has an advantage of excellent processability because of its excellent high-temperature elongation using an unstretched film. The packaging container is a food packaging container, and may be a disposable food packaging container.
In addition, the composite sheet 100 of the present invention includes the polyester foam sheet 101 and the polyester film 102 having the same composition, and thus has an advantage of being convenient in separation and recycling.
First, the polyester foamed sheet 101 and the polyester film 102 of the present invention are polyester resins, which may include repeating units derived from an acid component and a diol component. Specifically, the polyester resin may be one or more selected from the group consisting of aromatic and aliphatic polyester resins synthesized from a dicarboxylic acid component and an ethylene glycol component or hydroxycarboxylic acid.
The polyester resin may be, for example, one or more selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polylactic acid (PLA), polyglycolic acid (PGA), polyethylene adipate (PEA), Polyhydroxyalkanoate (PHA), polytrimethylene terephthalate (PTT), and polyethylene naphthalate (PEN). Specifically, polyethylene terephthalate (PET) may be used in the present invention.
That is, the polyester foam sheet 101 may be a polyethylene terephthalate (PET) foam sheet, and the polyester film 102 may be a polyethylene terephthalate (PET) film.
The composite sheet 100 includes the polyester foam sheet 101 and the polyester film 102 having the same composition, and thus has an advantage of being convenient in separation and recycling. The polyester foam sheet 101 and the polyester film 102 may be bonded to each other by a low-melting polyester powder (not shown), a solvent-based adhesive, or the like. The composite film 100 of the present invention is composed of the same polyester resin as the components of the adhesive in addition to the polyester foamed sheet 101 and the polyester film 102, and thus, the adhesive strength between the foamed sheet and the film can be improved, and the composite film has an advantage of being convenient in separation and recycling as described above. The low-melting powder may be entirely or partially melted during the bonding process and then cured to bond the two layers, and may remain entirely or partially after the bonding process, so that the bonded state of the two layers may be maintained.
Also, the average density of the foamed sheet (KS M ISO 845) may be 50kg/M3To 700kg/m3. Specifically, the average density of the foamed sheet may be 50kg/m3To 500kg/m3、50kg/m3To 300kg/m3、50kg/m3To 100kg/m3、100kg/m3To 700kg/m3、200kg/m3To 700kg/m3、300kg/m3To 700kg/m3、500kg/m3To 700kg/m3、300kg/m3To 600kg/m3Or 400kg/m3To 500kg/m3。
Further, when the density of the foam sheet is too low, the foam sheet may be broken when the packaging container is processed because of a large amount of bubbles in the foam sheet, and it is not easy to prepare a packaging container satisfying the condition that H/D is not less than 0.3 (H: the depth of the storage portion, D: the diameter of the opening portion). Alternatively, although the above-mentioned condition of H/D ≧ 0.3 can be satisfied, it is difficult to realize a packaging container having an average thickness of 2.0mm or less, and there is a possibility that a large variation in the thickness of the bottom portion and the wall portion of the packaging container is caused. This may reduce the efficiency of the packaging container, such as compressive strength, heat resistance, and heat insulation.
Further, when the density of the foamed sheet is too high, the packaging container itself is heavy, and therefore, the foamed sheet is not suitable for a disposable packaging container, and there is a problem that the cost is increased in the production process.
Therefore, the average density of the foamed sheet forming the packaging container is preferably 50kg/m3To 700kg/m3Thus, the foamed sheet can achieve a thin thickness while enhancing the compressive strength, heat resistance, heat insulation, and the like.
In the present invention, the polyester film 102 may be an unstretched film. Here, the unstretched film may refer to an unstretched film that is not stretched in any direction except for a mechanical extrusion speed, and thus, does not impart orientation. In addition, "film" may be broadly defined to include not only a film shape generally used in the art to which the present invention pertains, but also a sheet shape.
In particular, the polyester film 102 is provided on one or both surfaces of the polyester foam sheet 101, so that the surface smoothness is improved, the printability is excellent, and the appearance after processing can be improved. For example, when a food packaging container is prepared, printing may be performed such that the polyester film 102 forms an outer face.
The polyester film 102 may be an unstretched film, and the density of the unstretched film may be 1000kg/m3To 1700kg/m3、1100kg/m3To 1600kg/m3、1200kg/m3To 1500kg/m3、1300kg/m3To 1450kg/m3、1350kg/m3To 1400kg/m3Or 1380kg/m3。
The tensile strength of the unstretched film may be 15kg/mm2The following. For example, the tensile strength of the unstretched film may be 1kg/mm2To 15kg/mm2、1kg/mm2To 12kg/mm2、1kg/mm2To 10kg/mm2、1kg/mm2To 8kg/mm2、1kg/mm2To 6kg/mm2、1kg/mm2To 4kg/mm2、1kg/mm2To 2kg/mm2、2kg/mm2To 15kg/mm2、4kg/mm2To 15kg/mm2、6kg/mm2To 15kg/mm2、10kg/mm2To 15kg/mm2、3kg/mm2To 13kg/mm2Or 5kg/mm2To 11kg/mm2. Tensile Strength may be used The test piece was measured by a measuring apparatus under conditions of a test piece size of 70mm in height, 25mm in width, a test speed of 50mm/min and a gap size of 20 mm.
In the composite sheet 100 of the present invention, the average thickness of the polyester foam sheet 101 may be 0.9mm to 10mm, and the average thickness of the polyester film 102 may be 15 μm to 200 μm. For example, the average thickness of the above polyester foam sheet 101 may range from 0.9mm to 10mm, 0.9mm to 8mm, 0.9mm to 6mm, 0.9mm to 4mm, 0.9mm to 2mm, 1mm to 10mm, 2mm to 10mm, 4mm to 10mm, 6mm to 10mm, 8mm to 10mm, 2mm to 8mm, or 4mm to 6 mm.
In addition, when the average thickness of the polyester foam sheet 101 is too thin, the problem of breakage of the foam sheet 101 may occur when a food container is manufactured. When the average thickness of the above polyester foamed sheet 101 is too thick, there is a problem that the cost is increased due to the too thick thickness thereof even if a food container is prepared, and it is difficult to prepare a food container of a desired shape when the food container is molded.
Also, the average thickness of the above polyester film 102 may be 15 μm to 200 μm, 15 μm to 150 μm, 15 μm to 100 μm, 15 μm to 80 μm, 15 μm to 60 μm, 15 μm to 50 μm, 15 μm to 40 μm, 40 μm to 200 μm, 60 μm to 200 μm, 80 μm to 200 μm, 100 μm to 200 μm, 40 μm to 150 μm, 80 μm to 150 μm, 20 μm to 45 μm, or 20 μm to 30 μm.
The thinner the thickness of the polyester film 102 is, the more excellent moldability may be. However, it may be difficult to realize the polyester film 102 in an unstretched state, and when the thickness is too large, a problem of cost increase may occur.
The composite sheet 100 may be a composite sheet 100 in which a polyester foamed sheet 101 and a polyester film 102 are laminated. Specifically, the composite sheet 100 may be formed by a step of bonding a polyester film 102 to a polyester foamed sheet 101 having a low-melting-point polyester powder or resin dispersed or laminated on one surface thereof, or a step of bonding a polyester foamed sheet 101 to a polyester film 102 having a low-melting-point polyester powder or resin dispersed or laminated on one surface thereof. Among them, methods for dispersing or laminating the low melting point polyester powder or resin may include spraying, placing, coating, bonding, evaporation, and the like. Here, the low-melting polyester powder or resin is a bonding powder or bonding resin used for bonding the foamed sheet 101 and the polyester film 102 of the composite sheet 100 in the present invention, and functions to impart a bonding force between the foamed polyester sheet 101 and the polyester film 102 of the composite sheet 100 by being carried between the foamed polyester sheet 101 and the polyester film 102. The low melting polyester powder or resin may refer to a copolyester powder or resin, a powder or resin having a low melting point (or softening point) of 250 ℃ or less, sometimes about 120 ℃ to 130 ℃.
The low-melting polyester powder may include one or more resins (low-melting polyester resins) capable of exhibiting a cohesive force, or the resin may be molded in a powder form. For example, the above low-melting polyester powder may be in the form of a powder of a polyester resin having a melting point of 180 ℃ to 250 ℃ or a softening point of 100 ℃ to 150 ℃.
For example, the melting point Tm of the low-melting polyester powder or resin may be 180 ℃ to 250 ℃ or may be absent. Specifically, the above melting point Tm may be 180 ℃ to 250 ℃, 185 ℃ to 245 ℃, 190 ℃ to 240 ℃, 180 ℃ to 200 ℃, 200 ℃ to 230 ℃, 195 ℃ to 230 ℃ or absent.
Also, the softening point of the above low melting point polyester powder or resin may be 100 ℃ to 150 ℃, specifically, 100 ℃ to 130 ℃, 118 ℃ to 128 ℃, 120 ℃ to 125 ℃, 121 ℃ to 124 ℃, 124 ℃ to 128 ℃ or 119 ℃ to 126 ℃.
Further, the low-melting polyester powder or resin may have a glass transition temperature Tg of 50 ℃ or higher. Specifically, the above glass transition temperature may be 50 ℃ to 80 ℃, more specifically, may be 61 ℃ to 69 ℃, 60 ℃ to 65 ℃, 63 ℃ to 67 ℃, 61 ℃ to 63 ℃, 63 ℃ to 65 ℃, 65 ℃ to 67 ℃, or 62 ℃ to 67 ℃.
Also, the above low-melting polyester powder or resin may have an intrinsic viscosity I.V of 0.5dl/g to 0.75 dl/g. Specifically, the above intrinsic viscosity I.V may be 0.6dl/g to 0.65dl/g, 0.65dl/g to 0.7dl/g, 0.64dl/g to 0.69dl/g, 0.65dl/g to 0.68 dl/g, 0.67dl/g to 0.75dl/g, 0.69dl/g to 0.72dl/g, 0.7dl/g to 0.75dl/g, or 0.63dl/g to 0.67 dl/g.
The low melting point polyester powder or resin of the present invention may include repeating units represented by chemical formula 1 and chemical formula 2. Thus, the melting point Tm, the softening point and the glass transition temperature Tg can be adjusted to the above ranges, and a resin having physical properties adjusted to the above ranges can exhibit excellent adhesion.
[ chemical formula 1]
Figure BDA0002689915910000071
[ chemical formula 2]
Figure BDA0002689915910000072
In the above chemical formula 1 and chemical formula 2,
m and n represent the mole fraction of the repeating units contained in the low melting point polyester powder or resin, n may be 0.05 to 0.5, 0.05 to 0.4, 0.1 to 0.4, 0.15 to 0.35, or 0.2 to 0.3, and m may be 0.5 to 0.95, 0.6 to 0.9, 0.65 to 0.85, or 0.7 to 0.8, based on m + n ═ 1.
The low melting point polyester powder or resin of the present invention may have a structure including repeating units represented by chemical formulas 1 and 2. The repeating unit represented by the above chemical formula 1 represents a repeating unit of polyethylene terephthalate (PET), and the repeating unit represented by the chemical formula 2 functions to improve the tear characteristics of a polyester resin including the repeating unit of polyethylene terephthalate (PET). Specifically, the repeating unit represented by the above chemical formula 2 includes a methyl group (-CH) as a side chain in the propylene chain bonded to the terephthalate 3) To secure a space to enable the rotation of the main chain of the polymerized resin, so that the melting point Tm can be lowered by an increase in the degree of freedom of guiding the main chain and a decrease in the crystallinity of the resin. This can exhibit the same effect as in the case where an asymmetric aromatic ring-containing isophthalic acid (IPA) is used in order to lower the melting point Tm of the crystalline polyester resin.
In this case, in the above polyester resin, a repeating unit represented by chemical formula 2 for lowering the melting point Tm of the resin together with a repeating unit represented by chemical formula 1 containing an ester repeating unit may be included as a main repeating unit. Specifically, when the total mole fraction of the resin is 1, the low melting point polyester resin of the present invention may include 0.5 to 1 of the repeating units represented by chemical formulae 1 and 2, specifically, may include 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.
Further, when the total mole fraction when the repeating unit represented by chemical formula 1 is included is 1(m + n ═ 1), the amount (n) of the repeating unit represented by chemical formula 2 included in the low-melting polyester powder or resin may be 0.05 to 0.5, specifically 0.05 to 0.4, 0.1 to 0.4, 0.15 to 0.35, or 0.2 to 0.3.
For example, the average weight per unit area of the low-melting polyester powder or resin may be 10g/m2To 50g/m2In particular, the average weight per unit area of the polyester resin powder may be 10g/m2To 40g/m2、10g/m2To 30g/m2、10g/m2To 20g/m2、20g/m2To 50g/m2、30g/m2To 50g/m2、40g/m2To 50g/m2Or 20g/m2To 40g/m2Within the range of (1). The present invention can prevent excessive increase of the composite sheet by controlling the average weight per unit area of the low-melting polyester powder within the above range, realize appropriate adhesion performance within the weight range of the polyester foam sheet and the polyester film, and suppress peeling between the polyester foam sheet and the polyester film.
And, the average particle diameter of the low melting point polyester powder may be in the range of 1 μm to 5 μm, and specifically, the average particle diameter of the polyester resin powder may be in the range of 1 μm to 4 μm, 1 μm to 3 μm, 1 μm to 2 μm, 2 μm to 5 μm, 3 μm to 5 μm, 4 μm to 5 μm, or 2 μm to 4 μm. The present invention controls the average particle diameter of the low-melting polyester powder within the above range, so that the low-melting polyester powder can be uniformly dispersed when dispersed on the surface of the foamed sheet 101 or the film 102.
In one example, the compounding of the inventionThe polyester foamed sheet 101 of the sheet 100 contains calcium carbonate, and thus can exhibit excellent processability. Specifically, the above polyester foam sheet 101 may contain 0.5 to 9 weight percent of calcium carbonate (CaCO) 3)。
Specifically, the above calcium carbonate (CaCO)3) The foamed sheet 101 of the present invention, which contains the inorganic particles as described above as inorganic particles, has a uniform sheet surface and can exhibit excellent thermoformability.
The thermal conductivity of the calcium carbonate may be 1kcal/mh ℃ to 3kcal/mh ℃. Specifically, the thermal conductivity of the calcium carbonate may be 1.2kcal/mh ℃ to 2.5kcal/mh ℃, 1.5kcal/mh ℃ to 2.2kcal/mh ℃, or 1.8kcal/mh ℃ to 2kcal/mh ℃. More specifically, the thermal conductivity of the calcium carbonate may be 1.5kcal/mh ℃ to 2.5kcal/mh ℃ or 1.8kcal/mh ℃ to 2.3kcal/mh ℃. As described above, the foamed sheet containing calcium carbonate exhibits excellent thermal conductivity to have a uniform surface, and can exhibit excellent thermoformability.
For example, the calcium carbonate may be present in an amount of 0.5 to 9 weight percent, relative to the total weight of the foam sheet composition. Specifically, the calcium carbonate may be present in an amount of 0.5 to 8 weight percent, 0.6 to 7 weight percent, 0.7 to 6 weight percent, 0.8 to 5 weight percent, 0.9 to 4 weight percent, 1.0 to 3.0 weight percent, 2 to 3.5 weight percent. For example, it may be 1.0 weight percent or 3 weight percent.
That is, the polyester foamed sheet 101 of the composite sheet 100 includes calcium carbonate, and the polyester film 102 is formed of an unstretched film, and thus may have excellent elongation.
Specifically, the composite sheet 100 of the present invention is characterized by an elongation of 200% to 600% after treatment at a temperature of 200 ℃ for 30 seconds. Specifically, the elongation of the composite sheet 100 may be 250% to 550%, 300% to 500%, 350% to 450%, or 370% to 430%.
Also, the present invention provides a method of manufacturing a packaging container.
Fig. 2 is a view sequentially showing a method of manufacturing a packaging container according to the present invention, and referring to fig. 2, the present invention provides a method of manufacturing a packaging container 10, the method of manufacturing the packaging container 10 including: disposing the composite sheet 100 between a female mold 21 and a male mold 22 of a molding apparatus; and a step of applying pressure to the female mold 21 and the male mold 22 to mold a packaging container, wherein in the molding step, the surface temperature of the female mold 21 is set to 40 ℃ to 200 ℃.
The composite sheet 100 may be a composite sheet in which a polyester foamed sheet and a polyester film are laminated. Specifically, the method for manufacturing the composite sheet 100 is not particularly limited, and may be manufactured by thermal fusion or thermal bonding under the application of pressure and heating. More specifically, the polyester film can be formed by a process of laminating a polyester film on a polyester foamed sheet having dispersed or laminated on one surface thereof a polyester powder or resin having a melting point of 180 ℃ to 250 ℃ or a softening point of 100 ℃ to 150 ℃.
In this case, the bonding step may be controlled within a range in which the polyester resin powder is melted or softened. For example, the above-described step of attaching may be performed at a temperature ranging from 100 ℃ to 250 ℃. Specifically, crimping may be performed at a temperature of 100 ℃ to 220 ℃, 100 ℃ to 200 ℃, 100 ℃ to 150 ℃, 150 ℃ to 250 ℃, 180 ℃ to 250 ℃, 190 ℃ to 240 ℃, 200 ℃ to 230 ℃, 140 ℃ to 190 ℃, 170 ℃ to 190 ℃, 175 ℃ to 185 ℃, 160 ℃ to 180 ℃, or 165 ℃ to 175 ℃ for 1 minute to 3 minutes. In the bonding step, a pressure greater than atmospheric pressure is applied. Can be molded into a desired shape in a state where heat and pressure are simultaneously applied. The range of the applied pressure is not particularly limited, and may be, for example, in the range of 1.5 to 10 atmospheres or 2 to 5 atmospheres.
For example, the laminating step may further include a step of preheating the polyester film at a temperature of 150 to 250 ℃. Specifically, it may be performed by applying heat for 1 to 60 seconds, 3 to 40 seconds, or 5 to 20 seconds at a temperature of 150 to 240 ℃, 150 to 200 ℃, 150 to 180 ℃, 180 to 230 ℃, 200 to 220 ℃, 210 to 230 ℃, 150 to 190 ℃, 180 to 185 ℃, 160 to 180 ℃, or 185 to 195 ℃.
The polyester foamed sheet may be prepared by dispersing a low-melting polyester powder on the surface of a polyester foamed sheet.
As another embodiment, a step of laminating a polyester film in which a low melting point polyester powder or resin having a melting point of 180 to 250 ℃ or a softening point of 100 to 150 ℃ is dispersed or laminated to a preheated polyester foamed sheet may be included. Since the detailed description is as described above, the detailed description thereof will be omitted here.
In the method of manufacturing the packaging container, the composite sheet 100 disposed between the female mold 21 and the male mold 22 may be thermoformed to form the packaging container 10. The thermoforming may be vacuum forming, press forming, or vacuum press forming combining vacuum forming and press forming, or a thermoforming method in which vacuum and/or press forming is performed while using a male die (plug) or after using the male die 22.
Referring to fig. 2, fig. 2(a) shows a step of disposing the composite sheet 100 between the female mold 21 and the male mold 22 of the molding apparatus before the composite sheet 100 is molded. Fig. 2(b) shows a drawing process and a thermal process, and as shown in fig. 2(b), the composite sheet 100 is drawn by lowering the male die 22, and is formed into the cavity shape of the female die 21 by vacuum suction from the female die 21, and heat is applied. Fig. 2(c) shows the pressing by the male die 22 and the compressed air from the female die 21 to mold the composite sheet 100 in molding into the shape of the male die 22 and to mold the packaging container 10 as a final molded product. After cooling, the male mold 22 is raised to remove the formed packaging container 10.
The foamed sheet included in the composite sheet 100 may be a foamed sheet produced by melting a polyester resin introduced into an extruder and extruding and foaming the molten polyester resin.
Specifically, the method for manufacturing a packaging container may include a step of manufacturing a foamed sheet, and in one example, the step of manufacturing a polyester foamed sheet may include a foaming process of manufacturing a foamed sheet by foaming a polyester resin. The foaming process described above can be performed using various forms of extruders. The foaming process can in principle be performed by bead foaming or extrusion foaming, preferably extrusion foaming. The extrusion foaming can simplify the process steps and enable mass production by continuously extruding and foaming the resin melt, and can prevent cracks, particle breakage, and the like from occurring between the beads during the expansion of the beads, thereby realizing more excellent compression strength.
For example, additives having various shapes may be added in the production step of the polyester foamed sheet of the present invention. The additives may be added to the fluid line or during the foaming process, as desired. The additive may have a Barrier (Barrier) property, a hydrophilization function, or a water-repellent function, and specifically, may include one or more functional additives selected from the group consisting of a thickener, a surfactant, a hydrophilizing agent, a heat stabilizer, a water-repellent agent, a pore size enlarging agent, an infrared ray attenuating agent, a plasticizer, a fire-retardant chemical, a pigment, an elastic polymer, an extrusion aid, an antioxidant, a nucleating agent, an air discharge preventing agent, and an ultraviolet absorber. Specifically, in the method for producing a foamed 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 above-listed functional additives may be further included.
For example, in the step of preparing the foamed sheet of the present invention, one or more additives selected from the group consisting of a thickener, a hydrophilizing agent, a heat stabilizer, a water repellent, a pore size enlarging agent, an infrared ray attenuating agent, a plasticizer, a fire-retardant chemical, a pigment, an elastic polymer, an extrusion aid, an antioxidant, an air discharge preventing agent, and an ultraviolet absorber may be added to the fluid connection line. Among additives required in the preparation of the foamed sheet, additives not charged into the fluid connection line may be charged during the extrusion process.
In addition, in the molding step, the surface temperatures of the surface of the male mold 22 and the cavity of the female mold 21 may be different from each other. Preferably, the surface temperature of the female mold 21 may be 40 ℃ to 200 ℃, for example, may be 40 ℃ to 180 ℃, 40 ℃ to 150 ℃, 40 ℃ to 120 ℃, 40 ℃ to 100 ℃, 40 ℃ to 80 ℃, 40 ℃ to 60 ℃, 60 ℃ to 200 ℃, 80 ℃ to 200 ℃, 100 ℃ to 200 ℃, or 150 ℃ to 200 ℃. Also, the surface temperature of the male mold 22 may be 20 ℃ to 200 ℃, for example, 20 ℃ to 180 ℃, 20 ℃ to 150 ℃, 20 ℃ to 120 ℃, 20 ℃ to 100 ℃, 20 ℃ to 80 ℃, 20 ℃ to 60 ℃, 60 ℃ to 200 ℃, 80 ℃ to 200 ℃, 100 ℃ to 200 ℃, or 150 ℃ to 200 ℃. In one example, the surface temperature of the male mold 22 may be 110 ℃ and the surface temperature of the female mold 21 may be 145 ℃. Preferably, the male die 22 may be in contact or stamped with the female die 22 for 0.5 seconds to 40 seconds, 1 second to 30 seconds, 3 seconds to 20 seconds, or 5 seconds to 15 seconds. The female mold 21 may have a structure in which a decompression hole 23 is formed on one side, and the decompression hole 23 may be used to decompress the cavity of the internal space.
Next, the method for manufacturing a packaging container of the present invention may further include the step of cooling the formed packaging container at a temperature ranging from-10 ℃ to 20 ℃. More specifically, the temperature at which the cooling step is carried out may be-5 ℃ to 18 ℃, -1 ℃ to 17 ℃, 1 ℃ to 16 ℃, 2 ℃ to 15 ℃, 3 ℃ to 14 ℃, 4 ℃ to 13 ℃, 5 ℃ to 12 ℃, 6 ℃ to 11 ℃, or 10 ℃. When the thermoformed packaging container is cooled to the above-mentioned range of temperature, the formation of the crystallinity of the polyester resin foamed sheet may be in the range of 10% to 35%. When cooling is performed in the above temperature range, the crystallinity of the polyester resin foamed sheet is prevented from excessively increasing, and a molded article can be easily molded in a mold, and a packaging container excellent in light weight and heat resistance can be produced.
Fig. 3 is a view showing a packaging container manufactured by the manufacturing method of a packaging container of the present invention. Referring to fig. 3, a packaging container 10 satisfying the following mathematical formula 1 may be prepared by the method of preparing a packaging container of the present invention. The packaging container 10 may include a storage portion and an opening portion. The storage portion may be a space surrounded by the bottom portion 11 and the wall portion 12 as a storage space (internal space) of the packaging container 10. The opening portion may be a portion that is open at the upper end of the packaging container 10.
[ mathematical formula 1]
0.01≤H/D≤2；
In the case of the mathematical formula 1,
h represents the depth of the containing part, the depth is 1cm to 15cm,
d represents the diameter of the opening.
For example, in the above mathematical formula 1, the H/D value may be 0.01 to 2, specifically, the H/D may range from 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. It can be seen from the above H/D values that the packaging container 10 of the present invention is excellent in moldability and thus can be dip molded.
That is, as described above, the packaging container 10 is manufactured using the composite sheet 100 including the polyester foamed sheet 101 and the unstretched polyester film 102, so that excellent processability can be exhibited.
As an example, the packaging container 10 of the present invention includes: a bottom 11; and a wall portion 12 extending upward along the periphery of the bottom portion 11 and having an open upper end, wherein the average thickness of the bottom portion 11 and the average thickness of the wall portion 12 may be 2.0mm or less, respectively. More specifically, the average thickness of the bottom portion 11 and the average thickness of the wall portion 12 may be 0.8mm to 2.0mm, 0.9mm to 1.8mm, 1.0mm to 1.6mm, 1.1mm to 1.4mm, or 1.2mm to 1.3mm, respectively. In addition, when the thickness of the bottom portion 11 and the thickness of the wall portion 12 of the packaging container 10 are within the above ranges, it is possible to prevent the strength and rigidity from being lowered while achieving weight reduction.
And, the average thickness T of the bottom 11aAnd the average thickness T of the wall part 12bRatio of (T)a：Tb) Can be prepared in the following steps of 1: in the range of 0.9 to 1.1. For example, the average thickness T of the bottom 11aAnd the average thickness T of the wall part 12bRatio of (T)a：Tb) Can be prepared in the following steps of 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: in the range of 0.97 to 0.99.
That is, the packaging container 10 of the present invention can be manufactured by dip molding, but the thickness of the bottom portion 11 and the wall portion 12 can be made almost constant.
In one example, when the H/D value is 1, the compression strength of the packaging container 10 of the present invention may be 4kgf/cm2To 25kgf/cm2. Specifically, when the H/D value is 1, the compressive strength of the packaging container 10 of the present invention may be 4kgf/cm2To 22kgf/cm2、4kgf/cm2To 18kgf/cm2、4kgf/cm2To 15kgf/cm2、4kgf/cm2To 10kgf/cm2、10kgf/cm2To 25kgf/cm2、15kgf/cm2To 25kgf/cm2Or 10kgf/cm2To 15kgf/cm2. As an example, when the H/D value is 1, the compression strength of the packaging container 10 may be 12kgf/cm2Or 9kgf/cm2. Since the compressive strength is as described above, the packaging container 10 of the present invention can have excellent durability.
As shown in fig. 3, a flange 13 extending outward along the periphery of the wall 12 may be formed at the upper end of the wall 12.
As shown in fig. 3, in the packaging container 10, the foam sheet 101 may be disposed on the inner side, and the unstretched polyester film 102 may be disposed on the outer side, or vice versa. The composite sheet 100 may be formed into 2 or more layers.
The packaging container 10 of the present invention may include a foamed sheet 101 and a film 102 of a polyester resin, which may be a polyethylene terephthalate (PET) resin. The polyethylene terephthalate resin is environmentally friendly and easy to recycle.
When the elution specification was measured in accordance with the standards of the safety division for food and drug of korea for instruments, container packages and raw materials thereof, the total elution amount of acetic acid, water and heptane should be 30ppm or less, and antimony, germanium, terephthalic acid, isophthalic acid and acetaldehyde should not be detected, and when the residual specification is measured, volatile substances should not be detected.
Specifically, as described above, since the packaging container of the present invention uses polyester resin which is an environmentally friendly material, it is possible to control harmful substances within a permissible range as described in the standard and specification bulletin for instrument and container packaging issued by the korea food and drug safety department, in particular, 2015-7.
The composite sheet is used to produce the packaging container 10, and the composite sheet is made of the material as described above, so that the packaging container 10 which is environment-friendly can be provided.
The present invention will be described in more detail below with reference to examples and experimental examples.
However, the following examples and experimental examples are only for illustrating the present invention, and the contents of the present invention are not limited to the following examples and experimental examples.
[ example 1 ]
After mixing 3 weight percent of calcium carbonate and 97 weight percent of polyethylene terephthalate resin, 0.5 weight part of pyromellitic dianhydride and 0.1 weight part of antioxidant (Irganox, IRG 1010) were mixed based on 100 weight parts of polyethylene terephthalate resin, heated to 280 ℃ and a resin melt was prepared. Thereafter, butane was used as a blowing agent, and 1.5 parts by weight of butane was added to the first extruder based on 100 parts by weight of polyethylene terephthalate (PET) resin and extrusion-foamed to prepare a polyethylene terephthalate foamed sheet having an average thickness of 1.0 mm. At this time, the density of the polyethylene terephthalate foamed sheet obtained was 460kg/m3。
Further, an average thickness of 30 μm and a density of 1380kg/m were prepared in advance by commercial purchase 3The polyethylene terephthalate film in an unstretched state.
Then, a low melting point polyethylene terephthalate powder was dispersed on one surface of the polyethylene terephthalate foamed sheet, and the prepared polyethylene terephthalate film was laminated thereon to prepare a composite sheet. At this time, as the above-mentioned low-melting point polyethylene terephthalate powder, a polyethylene terephthalate powder containing, as a main component, a polyester resin having a melting point of 180 ℃ to 250 ℃ or a softening point of 100 ℃ to 150 ℃ is used.
The prepared composite sheet was passed through an IR type ceramic heater zone, and after the surface temperature of the foamed sheet reached 160 ℃, the upper heater was set to 400 ℃, the lower heater was set to 280 ℃, and the residence time was set to 30 seconds, the male (Plug) temperature was set to 60 ℃, the female (Mold) temperature was set to 40 ℃, and the container was produced by pressing for 10 seconds.
A cup-shaped container design having a mold H/D of 0.91, a receiving portion H of 10.5cm and an opening D of 11.5cm was applied.
[ example 2 ]
A packaging container was produced by molding in the same manner as in example 1, except that the thickness of the unstretched polyethylene terephthalate film was 50 μm.
[ COMPARATIVE EXAMPLE 1]
A packaging container was produced by molding in the same manner as in example 1, except that a stretched polyethylene terephthalate film was used instead of the unstretched polyethylene terephthalate film. Further, the above stretched polyethylene terephthalate film was a biaxially stretched film, and the specific tensile strength was 20kg/mm2The film of (1).
[ COMPARATIVE EXAMPLE 2 ]
A packaging container was produced by molding in the same manner as in example 1, except that an unstretched polypropylene (PP) film was used instead of the unstretched polyethylene terephthalate film.
[ COMPARATIVE EXAMPLE 3 ]
By purchasing a foamed sheet made of polystyrene (density 730 kg/m)3Thickness 1mm) was formed, and the polystyrene foamed sheet was a product chemically foamed with Polystyrene (PS).
The results of adjusting the types of sheets and molding conditions in the examples and comparative examples are shown in table 1 below.
[ Table 1]
Figure BDA0002689915910000141
Figure BDA0002689915910000151
Referring to table 1 above, when the packaging container is formed using the composite sheet of the present invention, it is confirmed that the formation is good without breakage. However, since the composite sheet of comparative example 1 uses a stretched film, it is not stretched even if heat is applied, and the film is broken at the time of molding, so that a packaging container cannot be molded. Also, in the case of comparative example 2, when a polypropylene film was used and subjected to heat of high temperature in a Heater (Heater), a problem of film deterioration occurred.
[ Experimental example 1 ]
In order to confirm the physical properties of the composite sheet and the food container of the present invention, the high temperature elongation was measured for the packaging containers of examples and comparative examples. And the results thereof are shown in table 2.
At this time, in order to measure the high-temperature elongation, the tensile strength tester was placed in an oven, and the test piece was held at an oven temperature of 200 ℃ for 30 hours at a test speed of 50mm/min and a gap size of 20mm with a height of 70mm × a width of 25 mm.
[ Table 2]
Example 1 Example 2 Comparative example 1 Comparative example 2 Comparative example 3
High temperature elongation (%) 380 420 180 350 360
Table 2 shows that the composite sheets of examples 1 and 2 of the present invention have excellent high-temperature elongation, considering that the composite sheets of comparative example 1 have a high-temperature elongation of 300% or more and 200% or less.
[ Experimental example 2]
In order to confirm the physical properties of the food container of the present invention, the thickness ratio and the compressive strength of the side portion and the lower portion of the packaging container of examples and comparative examples were measured, and the results are shown in table 3.
At this time, after the thickness of the central portion of the side surface and the bottom surface was measured, the thickness ratio of the side portion to the bottom portion was expressed as the ratio of the side surface thickness to the bottom surface (lower portion) thickness.
After the food container was placed with the bottom surface facing upward using a tensile strength tester, the compressive strength was measured at the maximum load when the food container was compressed at a test speed of 50 mm/min.
[ Table 3]
Figure BDA0002689915910000161
Looking at table 3, the thickness ratio of the side portion to the bottom portion was 0.9 or more in examples 1 and 2, and the thickness ratio of the side surface to the bottom surface was similar. In contrast, in comparative example 2, the thickness ratio of the side portion to the lower portion was less than 0.8, and it was found that the bottom surface was thicker than the side surfaces. In addition, in the case of comparative example 1, since breakage occurred when the food packaging container was molded, it was not possible to prepare a packaging container.
[ Experimental example 3]
The elution amount of the harmful material of the food containers prepared in example 1 and comparative example 3 was evaluated. Specifically, the amount of harmful substance eluted was measured after heating the food container in a 800W microwave oven for 5 minutes, and the evaluation items appeared to satisfy the standard of No. 2016-51, a bulletin issued by the Ministry of safety of food and drugs. And the evaluation items and results are shown in table 4 below.
[ Table 4]
Figure BDA0002689915910000162
Referring to table 4 above, the food containers of the examples did not detect volatile substances, and thus, appeared to satisfy the standards reported by the department of food and drug safety. However, in the case of the food container of the comparative example, styrene was 412mg/kg, and a large amount thereof was found to remain. In the case of the food container of the example, 4% acetic acid and water were not eluted. However, in the case of the food container of the comparative example, 4% acetic acid and water were eluted. It was confirmed that the food container of the present application can significantly reduce the amount of the remaining hazardous substance and the amount of elution.

Claims (11)

1. A composite sheet, comprising:
a polyester foamed sheet having an average thickness of 0.9mm to 10 mm; and
a structure in which a polyester film having an average thickness of 15 to 200 μm is laminated on one or both surfaces of a foam sheet, the polyester film being an unstretched film,
after 30 seconds of treatment at a temperature of 200 ℃, the elongation is 200% to 600%.
2. The composite sheet of claim 1, wherein the polyester foam sheet is a polyethylene terephthalate foam sheet and the polyester film is a polyethylene terephthalate film.
3. The composite sheet of claim 1, wherein the polyester foam sheet has a density of 50kg/m3To 700kg/m3。
4. The composite sheet of claim 1, wherein the unstretched film has a tensile strength of 15kg/mm2The following.
5. The composite sheet according to claim 1, wherein the polyester foamed sheet and the polyester film are bonded by a polyester powder or a resin having a melting point of 180 ℃ to 250 ℃ or a softening point of 100 ℃ to 150 ℃.
6. A method of making a packaging container comprising the steps of:
disposing the composite sheet according to claim 1 between a female mold and a male mold of a molding apparatus; and
A step of applying pressure to the female mold and the male mold and molding,
in the molding step, the surface temperature of the female mold is set to 40 ℃ to 200 ℃.
7. The method of producing a packaging container according to claim 6, wherein the composite sheet is formed by a step of laminating a polyester film on a polyester foamed sheet having polyester powder or resin dispersed or laminated on one surface thereof, and the polyester powder or resin has a melting point of 180 ℃ to 250 ℃ or a softening point of 100 ℃ to 150 ℃.
8. The method of producing a packaging container according to claim 6, wherein the composite sheet is formed by a step of laminating a polyester foamed sheet on a polyester film having polyester powder or resin dispersed or laminated on one surface thereof, and the polyester powder or resin has a melting point of 180 ℃ to 250 ℃ or a softening point of 100 ℃ to 150 ℃.
9. The method of manufacturing a packaging container according to claim 6, further comprising the step of cooling the formed packaging container at a temperature of-10 ℃ to 20 ℃.
10. The method of manufacturing a packaging container according to claim 6, wherein the packaging container includes a storage portion and an opening portion, and satisfies the following equation 1,
[ mathematical formula 1]
0.01≤H/D≤2；
In the case of the mathematical formula 1,
h represents the depth of the containing part, the depth is 1cm to 15cm,
d represents the diameter of the opening.
11. The method of manufacturing a packaging container according to claim 10,
the packaging container includes:
a bottom; and
a wall part extending upward along the periphery of the bottom part and having an open upper end,
the average thickness of the bottom and the average thickness of the wall are 0.8mm to 2.0mm respectively,
average thickness of the bottom (T)a) Average thickness (T) of wall portionb) Ratio of (T)a：Tb) Is 1: 0.9 to 1.1.
CN201980020474.3A 2018-12-18 2019-12-18 Composite sheet having excellent processability and method for producing packaging container comprising same Pending CN111867831A (en)

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