WO1993023190A1 - Panneau alveolaire ayant une elasticite amelioree - Google Patents

Panneau alveolaire ayant une elasticite amelioree Download PDF

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Publication number
WO1993023190A1
WO1993023190A1 PCT/KR1992/000084 KR9200084W WO9323190A1 WO 1993023190 A1 WO1993023190 A1 WO 1993023190A1 KR 9200084 W KR9200084 W KR 9200084W WO 9323190 A1 WO9323190 A1 WO 9323190A1
Authority
WO
WIPO (PCT)
Prior art keywords
honeycombed
panel
core
thermoplastic resin
sheets
Prior art date
Application number
PCT/KR1992/000084
Other languages
English (en)
Inventor
Seong Roon Jeong
Seung Gyu Lim
Hoon Heui Jeong
Original Assignee
Sunkyong Industries 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
Application filed by Sunkyong Industries Co., Ltd. filed Critical Sunkyong Industries Co., Ltd.
Publication of WO1993023190A1 publication Critical patent/WO1993023190A1/fr

Links

Classifications

    • 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
    • B32B3/10—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 discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—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 discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • 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
    • B32B27/08—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 synthetic resin
    • 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
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder 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
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • 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
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/08—Reinforcements
    • 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
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/10—Fibres of continuous length
    • B32B2305/18—Fabrics, textiles
    • B32B2305/188—Woven fabrics
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2398/00—Unspecified macromolecular compounds
    • B32B2398/20—Thermoplastics

Definitions

  • the present invention relates to a honeycombed panel made of thermoplastic resin, particularly to a honeycombed panel improved in shock resistance and resilience by both dynamic stability of the plastic resin material and compressed air in the honeycombed cell of the panel.
  • a honeycombed panel may be made of an array of hexagonal cells made of strips of flat material glue bonded together and upper and lower facing sheets bonded to the both side of the array of hexagonal cells.
  • the honeycombed panel is used as shock protector.
  • Honeycombed panels are classified into a rigid type used in lightweight structures and a flexible type having good dynamic stability.
  • the former is suitable for making partition walls of aircraft structures and boat hull structures, and the latter is used as shock absorbing elements in many kind of shock protectors.
  • a honeycombed panel which is improved in the shock absorption efficiency, is provided in the U. S. Patent No. 5,039,567 Cards et al.
  • a number of thermoplastic resin sheets are thermal compression-bonded to each other so that a honeycombed core is to be made and facing sheets are bonded on each side of the honeycombed core. Therefore, the honeycombed cells of the core are sealed by the wall of the cell and the facing sheets and the air in each of the honeycombed cells can absorb impact force applied on the honeycombed panel.
  • the inventors of the present invention investigated the honeycombed panel to improve efficiency of the shock absorption. As a result, we found out that the efficiency of the shock absorption of the honeycombed panel can be improved by increasing the inner air-presssure of the honeycombed cells.
  • a preferred embodiment of the present invention is composed of a honeycombed core which is made with a plurality of sheets of thermoplastic resin being thermal compression bonded and cut into slices of appropriate thickness, and upper and lower facing sheets which are made of the same material as that of the core and thermally bonded on the upper side and lower side of the honeycombed core respectively, under high atmospheric pressure so that the inner pressure, of honeycombed cell is kept at above atmosperic pressure.
  • the essential is that the inner pressure of honeycombed cells is kept at higher than atmospheric pressure in order to improve resilience of the honeycombed panel.
  • the thermoplastic resin used to fabricate the honeycombed panel can be selected from among polystyrene, polyamide, polyester, polyethylene, polypropylene, thermoplastic polyurethane, kraton rubber and polyvinyl chloride.
  • thermoplastic resin coated fiber or textile fabric can be used.
  • the fiber is selected from among polyolefin fiber, glass fiber, graphite fiber or aramide fiber.
  • the air pressure in the honeycombed core of the panel should be higher than atmospheric pressure so that improved efficiency of the resilience of the panel can be expected.
  • the maximum of the air pressure is not limited, but it is preferred that the air pressure should be from greater than 1 - 5 atm, and considering the mechanical property of the thermoplastic resin, it is more preferred that the air pressure is limited within the range of 1 ⁇ 3 atm in view of from greater than fabrication process and cost.
  • the air pressure can be more than 5 atm if the tensile strength and bonding force of the panel is increased, and still more improved resilience of the panel can be 5 expected.
  • honeycombed panel according to the present invention the 1.0 materials of honeycombed core are not required to be same as that of the facing sheet, if they are made of thermoplastic resin.
  • Fig 1. is a simplified schematic section view of a plurality of thermoplastic sheets stacked to be thermally bonded to each other in order to fabricate a honeycombed core in accordance with the present invention
  • Fig 2a shows a block that a plurality of thermoplastic sheets are thermally bonded to 0 each other
  • Fig 2b shows a core strip cut from the block in Fig 2a
  • Fig 3. shows the core strip engaged with hook pins to be expanded to form a honeycombed core
  • Fig 4. shows that the core strip is expanded in order to form a honeycombed core
  • 5 Fig 5. shows that the honeycombed core is thermally fixed in the hot plate and a facing sheet is thermally bonded on one surface of the honeycombed core
  • Fig 6. shows that a facing sheet is thermally bonded on the other surface of the honeycombed core in the pressurized heating press
  • Fig 7. is perspective view of- the honeycombed panel which is fabricated according to 0 the present invention and cut out a segment of the upper facing sheet from the panel.
  • the panel 10 includes a honeycomb ⁇ like core 12 preferably made of bonded together and expanded strips 14 of thermoplastic material to which facing sheets 16, and 18 are thermal compression bonded.
  • the materials of the honeycombed core 12 and the facing sheets 16, 18 is desirably composed of a flexible thermoplastic resin such as thermoplastic polyurethane, flexible polyester, polyethylene, polypropylene, kraton rubber, polyvinyl chloride or polyamide which have a good resilience.
  • the material of the honeycombed core 12 is preferably the same as that of the facing sheets 16, 18, but even if the materials are different from each other, the effects of the present invention are not reduced as long as the material of the core 12 and the facing sheets 16, 18 is selectively used within the above described parameters.
  • a composite material containing woven fabric of reinforced fiber or non- woven fabric can be used as the materials of the core strip 14, and then the reinforced fiber is selected from among polyolefm fiber, glass fiber, graphite fiber and aramide fiber . Since the reinforced fiber is used as the material of the core strip 14, the dynamic stability of the honeycombed core is increased and inner pressure of the cell of the honeycombed core can be kept at greater than atmospheric pressure.
  • the resilience of the honeycombed panel in accordance with the present invention is considerably improved.
  • the method of fabrication of the honeycombed panel in accordance with the present invention is different from the prior method in that the inside of the cells of the honeycombed core 12 is kept at more than atmosphere.
  • Fig 1. is a simplified schematic section view showing the first step of fabrication, the honeycombed core in accordance with the present invention.
  • a plurality of rectangular sheets 20 of thermoplastic material is laid up upon the upper surface of a bonding fixture base 22 one by one.
  • the base 22 is moved into position beneath a thermal bonding plate 24 having vertically extending bonding ribs 26 as depicted in Fig 1.
  • the base 22 is then moved upwardly to cause the top surface of sheet 20 to engage with the ribs 26 and force the areas of the bottom surface of sheets 20, lying beneath the ribs 26 into compressive engagement with corresponding top surface areas of the sheets 20 causing such areas to be thermally bonded to each other.
  • a plurality of thermoplastic sheets are stacked and thermally bonded to each other, when new one sheet 20 is laid up on the lower bonded sheets 20, the base 22 is shifted rightwardly or leftwardly a predetermined distance so that the areas of new sheet to be bonded to the lower sheets 20 are alternatively positioned against the bonding areas of the lower sheet 20.
  • the thickness of the thermoplastic resin sheets 20 is preferred to be in the range of 0.01 ⁇ 3mm.
  • the thickness of the sheets 20 is not limited as long as the sheet could be thermally bonded to each other.
  • the temperature of the thermal bonding plate 24 can be variable and is preferred to be the range of the fusing point of the thermoplastic resin.
  • the temperaure of the thermal bonding plate 24 could be about lSO .
  • the above described process is repeated until a laminated assembly having a preselected number of laminations is provided.
  • the lamination block 28 is then cut into a plurality of core strips 30.
  • the strip-cutting operation is carried out by a commercially available cutter (Fig 2).
  • Fig 3 shows the core strip 30 engaged with hook pins 32 and
  • Fig 4 shows that the core strip 30 is expanded in order to form a honeycombed core 14.
  • the expanded honeycombed core has an internal stress by expanding upward and downward pulling movement of the hook pin 32. Therefore, the expanded honeycombed core is compressively heated in a heating press 34 so as to release the internal stress and fix the expanded state of the honeycombed core 12.
  • one facing sheet 16 is positioned on one surface of the honeycombed core
  • honeycombed core 12 which is thermally bonded on one facing sheet 16 is carried into a pressurized heating chamber 36, in which the other facing sheet 18 is thermally bonded on the other surface of the honeycombed core 12 under high pressure(Fig 6).
  • the pressurized heating chamber 36 is composed of an upper frame 38 which includes a compressor 40, a pressure gauge 42, an air vent port 44 and a heating means
  • the upper frame 38 and the lower frame 48 have a cavity in its lower side and its upper side respectively. Therefore, when the upper frame 38 and the lower frame
  • a chamber 52 is formed between the frame 38, 48.
  • a heating plate 54 is provided at the state that the heating plate 54 is fixed on the upper surface of the chamber 52 and connected with the heating means 46, and a pressing die 56 is provided at the state that when the lower frame 48 is separated and moved upwardly or downwardly, the pressing die 56 is accompanied by a pressing rod 58 provided in the lower frame 48.
  • the honeycombed core 12 carried into the pressurized heating chamber 36 is positioned on the pressing die 56. At this time, the closed side of the honeycombed core 12 with the facing sheet 16 faces toward the pressing die 56 and the open side of the honeycombed core 12 is faced toward the heating plate 54. And then, the facing sheet 16 is laid out on the open side of the honeycombed core 12 and it is preferred that a Teflon film sheet 58 be laid out on the heating plate 54 so as not to be thermally bonded between the heating plate 54 and the facing sheet 16.
  • the upper frame 38 is air-tightly engaged with the lower frame 48, as the the upper frame 38 and the lower frame 48 are fitted to each other through the packing ring 50.
  • the chamber 52 is compressed by the air supplied from the compressor
  • the next step is to move the pressing die 56 upwardly through a pressing rod 60 which is provided in the lower frame 48 and to press the honeycombed core 12 toward the heating plate 54 so that the facing sheet 16 is thermally bonded to the open surface of the honeycombed core 12 under high air pressure. Therefore the inner pressure of each cell of the honeycombed is kept at more than atmospheric pressure.
  • the final step is to move the pressing die 56 downwardly and release the air pressure of the chamber 52 after cooling the honeycombed panel 10. And, the upper frame 38 and the lower frame are separated from each other and the product is put out from the chamber 52.
  • the final product has a good dynamic stability and resilience because the inner air pressure of each cell of the honeycombed core 12 is high, i.e. greater than atmospheric pressure and the core strip 14 itself has a good restorability.
  • the honeycombed panel in accordance with the present invention can be used as a shock-absorption element in footwear or a kind of protector and a resilient member in many kinds of industry.
  • a sublimatable solid such as a dry ice or naphthalene or a vaporatable liquid such as ethanol can be used.
  • the thermal bonding plate 24 having a plurality of heating wires in parallel arranged on it is heated to 150t and the polyurethane sheets are thermally compression-bonded by the plate 24 for 10 seconds. And then, one more sheet is stacked on the bonded plate and also thermally compression-bonded at the alternative areas of the prior bonded areas of the lower sheets. This bonding operation is repeated until 100 sheets are laminated.
  • the laminating block is cut out to a plurality of core strip 30 having 5mm width.
  • the core strip 30 is expanded by using a plurality of hook pin 32 to form a honeycombed core.
  • the form of expanded core strip 30 is thermally fixed by the heating press 34 beeing heated to 150 * C for 10 seconds.
  • a facing sheet 16 of polyurethane resin material is laid on one surface of the honeycombed core 12, and then the facing sheet 16 is thermally bonded at 15012 in the heating compression press.
  • the resilience of the honeycombed panel in accordance with the present invention is tested and the tested values are compared with that of the conventional honeycombed panel.
  • the tested value are depicted in Table 1 and Table 2.
  • the laminated block 28 is cut into a core strip 30 having 5mm width.
  • the core strip 30 is expanded and heat set under conditions that the temperature and the air pressure of the heating press is 130 " and 1.5 atm. respectively.
  • honeycombed panel according to this example The resilience of the honeycombed panel according to this example is tested, and compression loads applied on the honeycombed core when compression displacement are respectively represented as 10%, 20%, and 50% of the thickness of the honeycombed panel in the compression-displacement test, compared with that of the conventional honeycombed panel.
  • the conventional honeycombed panel used is a product which is made by
  • Test method according to ASTM D 3574 Test C, when the thickness of the test piece is respectively displaced to 10%, 20% and 50% of the test piece, applied compression load is measured.
  • the honeycombed panel according to the present invention has improved restoration force of the honeycombed core itself made of thermoplastic resin as well as the resilience of the honeycombed panel. Therefore, the honeycombed panel in accordance with the present invention has advantages when a great impact force is applied on it, since force can be absorbed by the high pressure cells of the honeycombed panel.

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  • Laminated Bodies (AREA)

Abstract

Un panneau alvéolaire réalisé en résine thermoplastique présente une résistance aux chocs et une élasticité améliorées grâce aussi bien à la stabilité dynamique du matériau plastique (résine) qu'à la présence d'air comprimé ou d'un autre gaz comprimé dans les alvéoles du panneau.
PCT/KR1992/000084 1992-05-20 1992-01-28 Panneau alveolaire ayant une elasticite amelioree WO1993023190A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR92008544A KR950010573B1 (en) 1992-05-20 1992-05-20 Honeycomb panel
KR1992/8544 1992-05-20

Publications (1)

Publication Number Publication Date
WO1993023190A1 true WO1993023190A1 (fr) 1993-11-25

Family

ID=19333333

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR1992/000084 WO1993023190A1 (fr) 1992-05-20 1992-01-28 Panneau alveolaire ayant une elasticite amelioree

Country Status (2)

Country Link
KR (1) KR950010573B1 (fr)
WO (1) WO1993023190A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012046127A1 (fr) 2010-10-08 2012-04-12 Iplast Holding Nv Plaque composite et procédé de fabrication d'une telle plaque composite
RU2619315C2 (ru) * 2015-05-14 2017-05-15 Федеральное государственное бюджетное учреждение науки Институт химии Дальневосточного отделения Российской академии наук (ИХ ДВО РАН) Способ изготовления газонаполненных тонкостенных силовых панелей
CN114055898A (zh) * 2021-11-29 2022-02-18 广东富强科技股份有限公司 一种复合材料及其制备方法和应用

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387505A1 (fr) * 1989-02-03 1990-09-19 PUMA Aktiengesellschaft Rudolf Dassler Sport Chaussure, notamment chaussure de sport ou chaussure de rééducation
US5039567A (en) * 1989-12-04 1991-08-13 Supracor Systems, Inc. Resilient panel having anisotropic flexing characteristics and method of making same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0387505A1 (fr) * 1989-02-03 1990-09-19 PUMA Aktiengesellschaft Rudolf Dassler Sport Chaussure, notamment chaussure de sport ou chaussure de rééducation
US5039567A (en) * 1989-12-04 1991-08-13 Supracor Systems, Inc. Resilient panel having anisotropic flexing characteristics and method of making same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012046127A1 (fr) 2010-10-08 2012-04-12 Iplast Holding Nv Plaque composite et procédé de fabrication d'une telle plaque composite
BE1019532A5 (nl) * 2010-10-08 2012-08-07 Iplast Holding Nv Structurele plaat.
RU2619315C2 (ru) * 2015-05-14 2017-05-15 Федеральное государственное бюджетное учреждение науки Институт химии Дальневосточного отделения Российской академии наук (ИХ ДВО РАН) Способ изготовления газонаполненных тонкостенных силовых панелей
CN114055898A (zh) * 2021-11-29 2022-02-18 广东富强科技股份有限公司 一种复合材料及其制备方法和应用

Also Published As

Publication number Publication date
KR930023162A (ko) 1993-12-18
KR950010573B1 (en) 1995-09-20

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