US20060165970A1 - Thermal insulation foamed sheet, thermal insulation foamed container and method for producing the same - Google Patents

Thermal insulation foamed sheet, thermal insulation foamed container and method for producing the same Download PDF

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Publication number
US20060165970A1
US20060165970A1 US10/523,569 US52356905A US2006165970A1 US 20060165970 A1 US20060165970 A1 US 20060165970A1 US 52356905 A US52356905 A US 52356905A US 2006165970 A1 US2006165970 A1 US 2006165970A1
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United States
Prior art keywords
foaming
thermal insulation
plane
base paper
sheet
Prior art date
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Abandoned
Application number
US10/523,569
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English (en)
Inventor
Osamu Chujo
Akio Morita
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Tokan Kogyo Co Ltd
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Tokan Kogyo Co Ltd
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
Priority claimed from JP2002222082A external-priority patent/JP3722434B2/ja
Priority claimed from JP2002222083A external-priority patent/JP3722435B2/ja
Application filed by Tokan Kogyo Co Ltd filed Critical Tokan Kogyo Co Ltd
Assigned to TOKAN KOGYO CO., LTD. reassignment TOKAN KOGYO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHUJO, OSAMU, MORITA, AKIO
Publication of US20060165970A1 publication Critical patent/US20060165970A1/en
Priority to US12/277,482 priority Critical patent/US8636930B2/en
Abandoned legal-status Critical Current

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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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/007—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a foam layer
    • 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
    • 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
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • B29C44/3453—Feeding the blowing agent to solid plastic 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
    • B32B27/06—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
    • B32B27/10—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 paper or cardboard
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • 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
    • 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
    • B32B5/20—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 foamed in situ
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303—Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249976—Voids specified as closed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249981—Plural void-containing components

Definitions

  • the present invention relates to a thermal insulation foamed sheet, thermal insulation foamed container formed by vacuum-suctioning a foamed cell group foamed mainly using moisture in base paper and method for producing the same.
  • the JP-A-57-110439 discloses such a structure that a water content contained in paper is vaporized by heating and this vaporized water content is used as a foaming material so as to foam a thermoplastic synthetic resin such as polyethylene film.
  • the foaming height is limited, and there is a problem that, even if time for heating is prolonged, the foaming height can not be increased.
  • a foam sheet and a paper board in which a large number of small holes for ventilation are penetrated is integrally joined with a large number of partial adhesives so as to form a complex sheet, and by vacuum-suctioning this foam sheet after heated and softened at a position other than the partial adhesives and from the side of the foam sheet to inflate and form the foam sheet along a forming die so that swollen projections are formed on the foam sheet.
  • the softened foam sheet is suctioned at a position other than the partial adhesion parts for expansion, which takes time and labor and causes the swollen portion to be largely expanded. That constitution is not suitable for a cup, and it is difficult to form a foaming plane with good feeling.
  • a joining inhibitor agent such as silicone oil
  • the joining inhibitor agent is applied in spots on the paper board and the laminate film which was made plastic by heating is extended on said applied portions by vacuum-suctioning so as to swell and form a foamed portion, the foamed portions are arranged in the scattered manner and a continuous foaming plane without a gap can not be obtained.
  • the inventors have, after a study in view of the above, developed a structure a foaming plane with continuing foaming cells without a gap by foaming a synthetic resin film with moisture in base paper as a foaming agent and the foaming height is gradually increased by vacuum-suctioning this foaming plane.
  • the moisture contained in the base paper is vaporized by heating, and this vaporized moisture is used as a foaming material to foam a thermoplastic synthetic resin such as polyethylene film.
  • the synthetic resin film forming this foaming plane is preferably polyethylene, but a thermoplastic film such as polypropylene, polyvinylchloride, polystyrene, polyester and nylon is used.
  • the base paper with the basis weight of 100 g/m 2 to 400 g/m 2 containing about 2% to 10%, preferably 4.5% to 8% of water is used.
  • Heating temperature for foaming is generally in a range of about 110 to 200 degrees centigrade, but it is determined as appropriate by type of the base paper and thermoplastic resin film to be used.
  • the expansion ratio can be temporarily increased but there is a critical problem that the foaming cells shrink at cooling and the foaming height can not be maintained.
  • a main object of the present invention is to provide a thermal insulation foamed sheet by forming a foaming plane made of a foamed cell group through foaming of a synthetic resin film mainly using moisture contained in base paper and by keeping the foaming height of this foaming plane by vacuum-suctioning, a thermal insulation foamed container using this and method for producing the same.
  • a sheet in which a synthetic resin film is laminated on base paper is heated, a foaming plane made of a foamed cell group is formed by foaming the synthetic resin film mainly using moisture contained in base paper, and the expansion ratio of the foaming cells is increased by vacuum-suctioning at least a part of the foaming plane so that the synthetic resin film can be foamed using the moisture contained in the base paper and the high expansion ratio can be maintained by vacuum-suctioning the foaming cells so as to prevent contraction of the foaming cells foamed at a high expansion ratio.
  • At least a part of said foaming plane is vacuum-suctioned so that a part of foaming cells in the foamed cell group is floated and adjacent foaming cells are stuck together so that the apparent foaming height is made equal.
  • Said foaming plane is formed on the whole or a part of the sheet.
  • the high expansion ratio can be maintained by preventing contraction of the foaming cells foamed at a high ratio.
  • the foaming plane is formed by heating and vacuum-suctioning, the heating temperature can be lowered and the heating time can be reduced. And moreover, deodorization of odors of ink, solvents, resin or lamination can be performed at the same time by vacuum-suctioning.
  • thermal insulation foamed container using the thermal insulation foamed sheet of the present invention said thermal insulation foamed sheet is used at least on the body section of the container, and insulation efficiency is improved by high foaming height, and its feeling can be made better.
  • a synthetic resin film is laminated on at least one side of base paper with the other side also subjected to lamination, and the body section or the container is heated so as to form a foaming plane made of a foamed cell group by foaming said synthetic resin film mainly using moisture contained in the base paper, and at least a part of the foaming plane is vacuum-suctioned so as to increase the foaming height of the foaming cell.
  • the foaming plane may be formed on a part of the body section or a part of the container.
  • the method for producing the thermal insulation foamed sheet according to the present invention is comprised of a step of forming a foamed surface made of a continuous foaming cell group by heating a sheet in which a synthetic resin film is laminated on base paper and by foaming the synthetic resin film mainly using moisture contained in the base paper, and a step of increasing the foaming height of the foaming cell by vacuum-suctioning at least a part of the foaming plane.
  • the method for producing the thermal insulation foamed container having said foaming plane at least on its body section is comprised of a step of forming a foaming plane made of a foamed cell group by foaming a synthetic resin film mainly using moisture contained in base paper, on both sides of which are laminated, through heating, and a step of increasing the foaming height of the foaming cell by vacuum-suctioning at least a part of the foaming plane.
  • FIG. 1 is a partial sectional view schematically showing a thermal insulation foamed sheet of a first preferred embodiment.
  • FIG. 2 is a partial sectional view schematically showing a thermal insulation foamed sheet of a second preferred embodiment.
  • FIG. 3 ( a ) is a plan view of a die for vacuum-suctioning having a vertical rib for fixing a sheet on its internal peripheral surface
  • FIG. 3 ( b ) is a sectional view thereof.
  • FIG. 4 is a sectional view of a die for vacuum-suctioning having a ring-state lateral rib for fixing a sheet on its internal peripheral surface.
  • FIG. 5 is a sectional view of a die for vacuum-suctioning not having a constraint means on its inner peripheral surface but having a fixing fixture mounted on the inner wall surface of a container for constraining the container to be set inside at suctioning.
  • FIG. 6 is a schematic diagram explaining deformation at the tip end of a foaming cell.
  • thermal insulation foamed sheet Preferred embodiment of the thermal insulation foamed sheet, thermal insulation foamed container and method for producing the same according to the present invention will be explained below.
  • a thermal insulation foamed sheet 1 has the same construction as that used in the conventional moisture foaming, and as shown in FIGS. 1 and 2 , base paper 3 is used for an intermediate layer to be a base material, a synthetic resin film 2 such as low-density polyethylene shown by a dotted line is laminated on a foaming plane, and a laminate film 4 made of a synthetic resin film or aluminum foil which is hard to be foamed is used for an inner layer.
  • moisture contained in the base paper is mainly used for the above moisture foaming, but if ink is applied or water-retentive substances are added onto the above sheet 1 , for example, moisture foaming for which this moisture is also used is also included.
  • the above sheet 1 not only the construction as a laminate sheet in which lamination has been performed in advance as above but also a three-layer construction in which either of an inner or an outer layer or both films are integrally laminated after being formed into the container state is included.
  • one unit of foam of the synthetic resin film is a foaming cell 20 , a state where the foaming cells 20 are continuously gathered is a foaming cell group 21 and a state where the foaming cell group 21 is formed in the surface state is a foaming plane 22 .
  • the foaming cell 20 formed by moisture foaming is further extended in the height direction by vacuum-suctioning to have the completed foaming cell 20 , but in this invention, the height of the foaming cell 20 formed by moisture foaming and that of the vacuum-suctioned foaming cell 20 may be substantially equal. That is, contraction after moisture foaming may be restrained by vacuum-suctioning.
  • sequence of a heating process for the above moisture foaming and a vacuum-suctioning process by vacuum is not limited to that of the vacuum-suctioning process subsequent to the heating process or that of the vacuum-suctioning process during the heating process but it also includes simultaneous execution of the above heating process and the vacuum-suctioning process and moreover performance of the heating process during the vacuum-suctioning process.
  • the sample is a sheet constituting a body section of a cup-shaped insulating paper container.
  • the base paper 3 with the basis weight of 250 g/m 2 is used for the intermediate layer to be the base material, a low-density polyethylene of 50 ⁇ m is laminated on the outer layer 2 to be the foaming plane, and a low-foaming synthetic resin film of 18 ⁇ m is used for the inner layer 4 to have a three-layer structure.
  • a heating method a thermostatic heating apparatus, Super Temp Oven STPH-200 (by Tabei-Espec Corporation) is used with the wind speed of LOW and a damper fully opened, and a gear motor is used for uniform heating while rotating it with the sample on the sample-frame so as to foam the outer layer.
  • a sample 1 was heated at 135 degrees centigrade for 90 seconds.
  • a sample 2 was heated at 165 degrees centigrade for 45 seconds.
  • a sample 3 was heated at 165 degrees centigrade for 90 seconds.
  • a control sample was heated at 135 degrees centigrade for 90 seconds.
  • vacuum-suctioning was performed using vacuum as follows.
  • the sample is placed in a bucket-shaped die for vacuum to apply a negative pressure on the foaming plane.
  • the die is for vacuum-suctioning of a sheet having the foaming plane, that is, the body section of a cup-shaped container, and the cup-shaped container is set so that its center line is fixed by the constraint means coaxially with the center line of the die.
  • This constraint means may be any method such that protrudes from the inner peripheral surface of the die and abuts on the foaming plane side, that fixes the back side of the foaming plane or that fixes the end of the sheet.
  • the die has its inner peripheral surface sized so that a gap for suctioning the foaming cell 20 is generated between the foaming plane of the cup-shaped container and the suctioning surface of the die.
  • a vertical rib 12 is provided on the inner surface of a bucket-shaped die 10 (see FIG. 3 ) as the constraint means.
  • the vertical ribs 12 are arranged with an equal interval (2 mm-pitch as an example) along the outer circumference direction of the body section, and their tip ends abut on the foaming plane.
  • the vertical rib 12 is fixed so that the above container is not even slightly moved or deformed in the die, and pressure of the vertical rib 12 depresses the abutting foamed cell group to be a flat surface and then, the surface of foamed cell group not in contact with the vertical rib 12 is vacuum-suctioned.
  • a ring-shaped lateral rib 13 (see FIG. 4 ) abutting on the foaming plane is provided as a constraint means in plural stages on the inner surface of the bucket-shaped die 10 , and the container with the foaming plane formed is fixed with the above lateral rib 13 and then, a negative pressure of 67 kpa is applied by vacuum-suctioning for 10 seconds.
  • the lateral rib 13 is fixed so that the above container is not moved or deformed in the die, and pressure of the lateral rib 13 depresses the abutting foamed cell group to be a flat surface and then, the surface of foamed cell group not in contact with the lateral rib 13 is vacuum-suctioned.
  • the sample 3 is placed in the bucket-shaped die 10 (See only the lower part of FIG. 5 ) without the above ribs, and a negative pressure of 67 kpa is applied by vacuum-suctioning for 10 seconds.
  • a constraint means for fixing the sheet with a foaming plane such as a rib formed is not provided in the die.
  • the control sample is not given the above vacuum-suctioning.
  • the cross section of the thermal insulation foamed containers constituted as above is observed by a microscope, and the foaming height is measured at 4 points to acquire an average value.
  • the average value of the foaming height for the control sample is 283 ⁇ m.
  • the sample 1 has the average value of 967 ⁇ m at the upper end of the foaming cell and an expansion ratio of about 20 times.
  • FIG. 1 the cross section of the sample 1 of the first preferred embodiment made of the foaming cell in which the foamed cell group adheres to the base paper is shown schematically in FIG. 1 .
  • 20 is the foaming cell formed in a large number and adhering to the base paper 3 , and the foaming cells 20 are integrally stuck to each other closely to maintain the height of the foamed cell group 21 or the foaming plane 22 .
  • FIG. 2 a cross section of the sample 1 in the second preferred embodiment is shown schematically in FIG. 2 .
  • the second preferred embodiment is constituted in the same conditions as in the above first preferred embodiment, and a discrepancy is caused in an expansion ratio of each of the foaming cells in the foamed cell group at foaming.
  • a foaming cell 20 ′ with a lower expansion ratio in the foaming cell group is floated from the base paper 3 and separated by vacuum-suctioning of the foaming cell, while the foaming cell 20 with a higher expansion ratio is stuck integrally to the base paper 3 , and these adjacent foaming cells 20 , 20 ′ are stuck to each other.
  • the foamed cell group 21 the actual foaming height of the foaming cell 20 foamed at the high expansion ratio and the apparent foaming height of the foaming cell 20 ′ foamed at the foaming ratio lower than that are kept almost at the same height, and the top level of the foaming plane 22 is aligned equal without any irregularity.
  • Numeral 23 in the Fig. is a gap generated at a floated portion.
  • first preferred embodiment is whether a part of the foaming cell adheres to the base paper 3 or not and the rest is the same. Therefore, the following explanation shall apply both to the first and the second preferred embodiments.
  • the average value when the heating time is 70 seconds under the same conditions as those for the sample 1 was 870 ⁇ m and 1001 ⁇ m for 90 seconds.
  • the average value was 859 ⁇ m for the sample 2.
  • the average value was 400 ⁇ m for the sample 3.
  • the container or sheet having the foaming plane is moved or deformed in the die at suctioning and an even suctioning force can not be applied to the foamed cell group, it is preferable to fix or constrain the container or sheet at a predetermined position so that the even suctioning force is applied on the foaming plane before performing vacuum-suctioning.
  • the foaming height is lower than the other samples 1 and 2, but that is because the sheet is deformed by vacuum-suctioning. It was confirmed that provision of a means for fixing the above sheet in the die is necessary.
  • the means for constraining this sheet formed in the shape of a container is not limited to the above preferred embodiment, but any means that fixes the sheet on which the foaming plane is formed at a predetermined position at the center of the die so that it is not moved or deformed in the die at vacuum-suctioning may be used. It can be formed either integrally with the die or separately, or it can be a contact type or a non-contact type.
  • the container is fixed at a predetermined position from the outer wall surface side, but the means may fix the container at the predetermined position from the inner wall side.
  • a constraint means having an abutted surface to be pressed onto a part of the foaming plane such as the vertical rib or the lateral rib in the above preferred embodiments is used, a portion in the foaming plane corresponding to the abutted face is depressed to be a recess portion, while a portion to be vacuum-suctioned is relatively raised to be a projecting portion, and an irregular pattern can be formed on this foaming plane.
  • the shape of the abutted face of the constraint means is directly made into the shape of the pattern to express the pattern in the recess portion, or the shape of the abutted face can be recessed along the profile of the pattern so that the pattern is floated and expressed by projecting portion. Or, these can be combined for expression.
  • the container or sheet can be constrained at vacuum-suctioning and at the same time, the irregular pattern can be formed on the foaming plane as if the shape of the abutted face of the above constraint means is copied.
  • This pattern can be expressed in the various ways such as those formed on a part of the foaming plane, those formed in the scattered manner, formed in the emboss state or formed in the continuous pattern by designing the shape of the abutted face.
  • the foaming cell formed in this way maintains its shape by vacuum-suctioning, but air in the foaming cell contracts by cooling and gradually bends with release of tension at its tip end as shown in FIG. 6 .
  • the tip end 20 ′ of each of the completed foaming cells 20 is softened so that hand-touch feeling is made excellent.
  • the height of the foaming plane is not made even but the height can be adjusted.
  • heating time can be reduced and heating temperature can be lowered, whereby labor and costs can be reduced.
  • odors of ink, solvents, etc. generated at forming can be suctioned at the same time for deodorization.
  • thermal insulation foamed sheet is a container in the shape of a cup, but it can be anything other than containers.
  • the foaming plane may be formed either on the inner or outer surface of the base paper.
  • foaming and suctioning may be performed after forming into a predetermined shape in advance or a sheet to which foaming and suctioning have been applied may be assembled in a desired shape.
  • the foaming plane may be formed on a part of the sheet or the body section or partially formed on the container.

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US10/523,569 2002-07-30 2002-12-10 Thermal insulation foamed sheet, thermal insulation foamed container and method for producing the same Abandoned US20060165970A1 (en)

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US12/277,482 US8636930B2 (en) 2002-07-30 2008-11-25 Thermal insulation foamed sheet, thermal insulation foamed container and method for producing the same

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2002-222082 2002-07-30
JP2002222082A JP3722434B2 (ja) 2002-07-30 2002-07-30 発泡断熱シートと発泡断熱容器、およびその製法
JP2002222083A JP3722435B2 (ja) 2002-07-30 2002-07-30 発泡断熱シートと発泡断熱容器、およびその製法
JP2002-222083 2002-07-30
PCT/JP2002/012922 WO2004011241A1 (ja) 2002-07-30 2002-12-10 発泡断熱シートと発泡断熱容器、およびその製法

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US20060165970A1 true US20060165970A1 (en) 2006-07-27

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US12/277,482 Active 2025-09-02 US8636930B2 (en) 2002-07-30 2008-11-25 Thermal insulation foamed sheet, thermal insulation foamed container and method for producing the same

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DE202005014177U1 (de) 2005-09-08 2005-11-17 Seda S.P.A., Arzano Doppelwandiger Becher
EP1785370B2 (en) 2005-11-11 2014-03-12 SEDA S.p.A. Insulated cup
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EP1547762A4 (en) 2010-06-09
US20090081393A1 (en) 2009-03-26
EP1547762A1 (en) 2005-06-29
CN1291833C (zh) 2006-12-27
CN1642729A (zh) 2005-07-20
KR20050026046A (ko) 2005-03-14
KR100654523B1 (ko) 2006-12-05
US8636930B2 (en) 2014-01-28
WO2004011241A1 (ja) 2004-02-05

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