WO2019007829A1 - A refrigerator comprising a plastic inner lining - Google Patents

A refrigerator comprising a plastic inner lining Download PDF

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Publication number
WO2019007829A1
WO2019007829A1 PCT/EP2018/067549 EP2018067549W WO2019007829A1 WO 2019007829 A1 WO2019007829 A1 WO 2019007829A1 EP 2018067549 W EP2018067549 W EP 2018067549W WO 2019007829 A1 WO2019007829 A1 WO 2019007829A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner lining
refrigerator
produced
polystyrene
wall
Prior art date
Application number
PCT/EP2018/067549
Other languages
French (fr)
Inventor
Hakan OZKAN
Emre DEMIRTAS
Umut KILIC
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2019007829A1 publication Critical patent/WO2019007829A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/065—Details
    • F25D23/066—Liners
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/062—Walls defining a cabinet
    • F25D23/064—Walls defining a cabinet formed by moulding, e.g. moulding in situ
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/22—Cleaning means for refrigerating devices

Definitions

  • the present invention relates to a refrigerator wherein plastic is used for producing the body inner linings.
  • the bodies and doors of the refrigerators are composed of an inner lining and an outer wall that surround the compartments wherein the foodstuffs are placed, and an insulation material such as polyurethane is injected into the volume between the inner lining and the outer wall.
  • the plastic sheets forming the bodies and door inner linings of the refrigerators have generally two-layer structures and produced from styrene-based plastic material by extrusion, and then, the inner lining is formed by the thermoforming method.
  • the lower layer of the refrigerator inner lining in contact with the polyurethane is produced from a plastic material called HIPS (High impact polystyrene) resistant against polyurethane chemicals.
  • HIPS High impact polystyrene
  • the upper layer of the refrigerator inner lining facing the inner volume wherein the foodstuffs are placed is produced from glossy HIPS material, and in some embodiments the glossy HIPS is mixed at certain ratios with high impact polystyrene and high density polyethylene (HDPE) and compatibilizer.
  • Agents such as c-pentane, etc. are used for the foaming of the polyurethane while the polyurethane is injected into the insulation volume between the inner lining and the outer wall. Gas arising from said agents and condensing liquid react with the plastic used for producing the inner lining and cause cracks in the inner lining.
  • the smearing of acidic materials such as food oils and oil vapor on the body and the door inner lining and the residues of cleaning agents used in the cleaning of the inner lining have an abrasive effect and cause cracks by breaking polymer bonds. Since the plastic material used for producing the inner linings is subject to thermal stress during the operation of the cooling device, material fatigue arises and, together with the effect of the chemical corrosives, causes the formation of cracks more quickly.
  • a refrigerator wherein plastic liner sheets are used in manufacturing the inner casings of the body, the liner sheet forming the inner casing comprising a main layer produced of HIPS (high impact polystyrene) material by extrusion process, and a protective layer which is formed on the surface of the main layer facing the compartment by co-extrusion method, having a high chemical resistance and a gloss that is not decreased below a certain limit.
  • HIPS high impact polystyrene
  • the aim of the present invention is the realization of a refrigerator comprising an inner lining with decreased costs, that is produced from a single-layer plastic sheet instead of multi layers by changing the formulation thereof.
  • the body and the door inner linings are produced from plastic sheets by extrusion.
  • Polyethylene terephthalate glycol-modified (PETG) resin is added to the polystyrene(PS)-based base material at a ratio of 10-50%.
  • Figure 1 - is the schematic view of a refrigerator.
  • Figure 2 - is the schematic view of the lining structure of the refrigerator of the present invention.
  • the refrigerator (1) comprises a body (2); at least one door (3); at least one fresh food/freezing compartment (4) wherein foodstuffs and beverages are placed; an inner lining (5) that is produced from plastic material by extrusion method, that forms the inner surfaces of the body (2) and the doors (3) facing the compartments (4) and that is produced from a plastic sheet comprising polystyrene(PS)-based material; an outer wall (6) that forms the outer surfaces of the body (2) and the doors (3), and an insulation volume (7) that is disposed between the inner lining (5) and the outer wall (6) and wherein polyurethane (PU) is injected.
  • PU polyurethane
  • the inner lining (5) is produced from
  • a single-layer plastic sheet comprising polyethylene terephthalate glycol-modified (PETG) added to the polystyrene(PS)-based base material.
  • PETG polyethylene terephthalate glycol-modified
  • the plastic sheet comprising a blend of
  • LLCPE linear low-density polyethylene
  • the PETG used in the production of the inner lining (5) is suitable for the thermoforming process and provides high chemical resistant. Moreover, resistance against polyurethane chemicals such as polyurethane foaming agent is increased. Cracking problems caused by vegetable-animal food oils and cleaning chemicals are prevented. Mechanical characteristics are improved, and the breaking and bending strength of the material is increased.
  • the PETG resin used in the plastic material blend provides the desired gloss, the need for adding special polymeric additives that increase gloss in the production of the inner lining is eliminated, and the gloss value is increased by 30% in comparison with the prior art.
  • the single-layer extrusion method is used instead of the double-layer co-extrusion method forming the two layers, thus shortening the process time and providing energy savings.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Refrigerator Housings (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Refrigerator (1) comprising a body (2); at least one door (3), at least one fresh food/freezing compartment (4) wherein foodstuffs and beverages are placed; an inner lining (5) that is produced from polystyrene(PS)-based base material by extrusion method and that forms the inner surfaces of the body (2) and the doors (3) facing the compartments (4); an outer wall (6) that forms the outer surface of the body (2) and the doors (3), and an insulation volume (7) that is disposed between the inner lining (5) and the outer wall (6) and wherein polyurethane (PU) is injected. The inner lining (5) is produced from a single-layer plastic sheet comprising polyethylene terephthalate glycol-modified (PETG) added to the polystyrene(PS)-based base material.

Description

A REFRIGERATOR COMPRISING A PLASTIC INNER LINING
The present invention relates to a refrigerator wherein plastic is used for producing the body inner linings. The bodies and doors of the refrigerators are composed of an inner lining and an outer wall that surround the compartments wherein the foodstuffs are placed, and an insulation material such as polyurethane is injected into the volume between the inner lining and the outer wall. The plastic sheets forming the bodies and door inner linings of the refrigerators have generally two-layer structures and produced from styrene-based plastic material by extrusion, and then, the inner lining is formed by the thermoforming method. The lower layer of the refrigerator inner lining in contact with the polyurethane is produced from a plastic material called HIPS (High impact polystyrene) resistant against polyurethane chemicals. The upper layer of the refrigerator inner lining facing the inner volume wherein the foodstuffs are placed is produced from glossy HIPS material, and in some embodiments the glossy HIPS is mixed at certain ratios with high impact polystyrene and high density polyethylene (HDPE) and compatibilizer. Agents such as c-pentane, etc. are used for the foaming of the polyurethane while the polyurethane is injected into the insulation volume between the inner lining and the outer wall. Gas arising from said agents and condensing liquid react with the plastic used for producing the inner lining and cause cracks in the inner lining. The smearing of acidic materials such as food oils and oil vapor on the body and the door inner lining and the residues of cleaning agents used in the cleaning of the inner lining have an abrasive effect and cause cracks by breaking polymer bonds. Since the plastic material used for producing the inner linings is subject to thermal stress during the operation of the cooling device, material fatigue arises and, together with the effect of the chemical corrosives, causes the formation of cracks more quickly.
In the European Patent No. EP2024696 (B1), a refrigerator is disclosed, wherein plastic liner sheets are used in manufacturing the inner casings of the body, the liner sheet forming the inner casing comprising a main layer produced of HIPS (high impact polystyrene) material by extrusion process, and a protective layer which is formed on the surface of the main layer facing the compartment by co-extrusion method, having a high chemical resistance and a gloss that is not decreased below a certain limit.
The aim of the present invention is the realization of a refrigerator comprising an inner lining with decreased costs, that is produced from a single-layer plastic sheet instead of multi layers by changing the formulation thereof.
In the refrigerator realized in order to attain the aim of the present invention, the body and the door inner linings are produced from plastic sheets by extrusion. Polyethylene terephthalate glycol-modified (PETG) resin is added to the polystyrene(PS)-based base material at a ratio of 10-50%.
The refrigerator realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
Figure 1 - is the schematic view of a refrigerator.
Figure 2 - is the schematic view of the lining structure of the refrigerator of the present invention.
The elements illustrated in the figures are numbered as follows:
  1. Refrigerator
  2. Body
  3. Door
  4. Compartment
  5. Inner lining
  6. Outer wall
  7. Insulation volume
The refrigerator (1) comprises a body (2); at least one door (3); at least one fresh food/freezing compartment (4) wherein foodstuffs and beverages are placed; an inner lining (5) that is produced from plastic material by extrusion method, that forms the inner surfaces of the body (2) and the doors (3) facing the compartments (4) and that is produced from a plastic sheet comprising polystyrene(PS)-based material; an outer wall (6) that forms the outer surfaces of the body (2) and the doors (3), and an insulation volume (7) that is disposed between the inner lining (5) and the outer wall (6) and wherein polyurethane (PU) is injected.
In the refrigerator (1) of the present invention, the inner lining (5) is produced from
a single-layer plastic sheet comprising polyethylene terephthalate glycol-modified (PETG) added to the polystyrene(PS)-based base material.
In an embodiment of the present invention, in the production of the inner lining (5), the plastic sheet comprising a blend of
- 10-50% polyethylene terephthalate glycol-modified (PETG) resin,
- 10-30% polyolefin-based linear low-density polyethylene (LLDPE)
- 5-15% butadien - styrene(BS)-based compatibilizer, and
- 0.01-2% lubricant
added to the 10-80% polystyrene(PS)-based base material.
No crystallization occurs during the production of the plastic sheet with PETG material thanks to the glycol additive in the compound, and a more flexible and bendable structure is obtained. The PETG used in the production of the inner lining (5) is suitable for the thermoforming process and provides high chemical resistant. Moreover, resistance against polyurethane chemicals such as polyurethane foaming agent is increased. Cracking problems caused by vegetable-animal food oils and cleaning chemicals are prevented. Mechanical characteristics are improved, and the breaking and bending strength of the material is increased. The PETG resin used in the plastic material blend provides the desired gloss, the need for adding special polymeric additives that increase gloss in the production of the inner lining is eliminated, and the gloss value is increased by 30% in comparison with the prior art. In the production of the plastic sheet of the inner lining (5), the single-layer extrusion method is used instead of the double-layer co-extrusion method forming the two layers, thus shortening the process time and providing energy savings.

Claims (2)

  1. A refrigerator (1) comprising a body (2); at least one door (3); at least one fresh food/freezing compartment (4) wherein foodstuffs and beverages are placed; an inner lining (5) that is produced from plastic material by extrusion method, that forms the inner surfaces of the body (2) and the doors (3) facing the compartments (4) and that is produced from a plastic sheet comprising polystyrene(PS)-based material; an outer wall (6) that forms the outer surfaces of the body (2) and the doors (3), and an insulation volume (7) that is disposed between the inner lining (5) and the outer wall (6) and wherein polyurethane (PU) is injected, characterized by the inner lining (5) that is produced from
    - a single-layer plastic sheet comprising polyethylene terephthalate glycol-modified (PETG) added to the polystyrene(PS)-based base material.
  2. A refrigerator (1) as in Claim 1, characterized by the inner lining (5) produced from the plastic sheet comprising a blend of
    - 10-50% polyethylene terephthalate glycol-modified (PETG) resin,
    - 10-30% polyolefin-based linear low-density polyethylene (LLDPE),
    - 5-15% butadien - styrene(BS)-based compatibilizer, and
    - 0.01-2% lubricant
    added to 10-80% polystyrene(PS)-based base material.
PCT/EP2018/067549 2017-07-04 2018-06-29 A refrigerator comprising a plastic inner lining WO2019007829A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2017/09820A TR201709820A2 (en) 2017-07-04 2017-07-04 REFRIGERATOR WITH PLASTIC INNER WALL
TRA2017/09820 2017-07-04

Publications (1)

Publication Number Publication Date
WO2019007829A1 true WO2019007829A1 (en) 2019-01-10

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PCT/EP2018/067549 WO2019007829A1 (en) 2017-07-04 2018-06-29 A refrigerator comprising a plastic inner lining

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WO (1) WO2019007829A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021053081A1 (en) 2019-09-19 2021-03-25 Basf Se Enhancement of long-term properties of closed-cell rigid polyurethane foams

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992013716A1 (en) * 1991-01-30 1992-08-20 E.I. Du Pont De Nemours And Company Fabricated articles with improved resistance to hydrohalocarbons
EP2024696B1 (en) 2006-05-31 2009-10-21 Arçelik A.S. A refrigerator
CN101831136A (en) * 2010-04-21 2010-09-15 深圳市科聚新材料有限公司 High-strength high-toughness flame-resistant ABS (Acrylonitrile Butadiene Styrene) composite material and preparation method thereof
EP2767559A1 (en) * 2011-10-11 2014-08-20 Braskem S.A. Polypropylene for the production of thermoformed articles, large, deep, complex and/or thick articles, process for thermoforming modified polypropylene into large, deep, complex and/or thick articles, and use of the polypropylene
CN106832812A (en) * 2017-01-22 2017-06-13 合肥华凌股份有限公司 The preparation method of application of the polyester material on refrigerator inner liner plates are prepared, refrigerator, inner container of icebox and its sheet material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992013716A1 (en) * 1991-01-30 1992-08-20 E.I. Du Pont De Nemours And Company Fabricated articles with improved resistance to hydrohalocarbons
EP2024696B1 (en) 2006-05-31 2009-10-21 Arçelik A.S. A refrigerator
CN101831136A (en) * 2010-04-21 2010-09-15 深圳市科聚新材料有限公司 High-strength high-toughness flame-resistant ABS (Acrylonitrile Butadiene Styrene) composite material and preparation method thereof
EP2767559A1 (en) * 2011-10-11 2014-08-20 Braskem S.A. Polypropylene for the production of thermoformed articles, large, deep, complex and/or thick articles, process for thermoforming modified polypropylene into large, deep, complex and/or thick articles, and use of the polypropylene
CN106832812A (en) * 2017-01-22 2017-06-13 合肥华凌股份有限公司 The preparation method of application of the polyester material on refrigerator inner liner plates are prepared, refrigerator, inner container of icebox and its sheet material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021053081A1 (en) 2019-09-19 2021-03-25 Basf Se Enhancement of long-term properties of closed-cell rigid polyurethane foams

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TR201709820A2 (en) 2019-01-21

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