FI843531L - Byggnadselement av betong med sandwichkonstruktion samt foerbindningselement och isoleringsskiva foer ett dylikt byggnadselement. - Google Patents

Byggnadselement av betong med sandwichkonstruktion samt foerbindningselement och isoleringsskiva foer ett dylikt byggnadselement.

Info

Publication number
FI843531L
FI843531L FI843531A FI843531A FI843531L FI 843531 L FI843531 L FI 843531L FI 843531 A FI843531 A FI 843531A FI 843531 A FI843531 A FI 843531A FI 843531 L FI843531 L FI 843531L
Authority
FI
Finland
Prior art keywords
byggnadselement
sandwichkonstruktion
isoleringsskiva
foerbindningselement
betong
Prior art date
Application number
FI843531A
Other languages
English (en)
Other versions
FI843531A0 (fi
FI70966B (fi
FI70966C (fi
Inventor
Ilmari Paakkinen
Original Assignee
Partek Ab
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 Partek Ab filed Critical Partek Ab
Priority to FI843531A priority Critical patent/FI70966C/fi
Publication of FI843531A0 publication Critical patent/FI843531A0/fi
Priority to DE19853531519 priority patent/DE3531519A1/de
Priority to US06/772,393 priority patent/US4640074A/en
Priority to DK410285A priority patent/DK410285A/da
Priority to SE8504176A priority patent/SE8504176L/
Publication of FI843531L publication Critical patent/FI843531L/fi
Publication of FI70966B publication Critical patent/FI70966B/fi
Application granted granted Critical
Publication of FI70966C publication Critical patent/FI70966C/fi

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
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance 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
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/14—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material next to a fibrous or filamentary layer
    • 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
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B13/045—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B13/12—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance 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
    • B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
    • B32B19/04—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • 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
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • B32B3/30—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 formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/044—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/288—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and concrete, stone or stone-like material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0228—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • 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
    • B32B2305/02—Cellular or porous
    • B32B2305/022—Foam
    • 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
    • B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
    • B32B2315/06—Concrete
    • 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
    • B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
    • B32B2315/14—Mineral wool
    • 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
    • B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene
    • 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
    • B32B2375/00—Polyureas; Polyurethanes

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Building Environments (AREA)
  • Rod-Shaped Construction Members (AREA)
FI843531A 1984-09-10 1984-09-10 Byggnadselement av betong med sandwich-konstruktion samt regelelement och isoleringsskiva foer ett dylikt byggnadselement FI70966C (fi)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FI843531A FI70966C (fi) 1984-09-10 1984-09-10 Byggnadselement av betong med sandwich-konstruktion samt regelelement och isoleringsskiva foer ett dylikt byggnadselement
DE19853531519 DE3531519A1 (de) 1984-09-10 1985-09-04 Bauelement aus beton mit einer sandwich-konstruktion und ein traegerelement und eine isolierplatte fuer ein solches bauelement
US06/772,393 US4640074A (en) 1984-09-10 1985-09-04 Concrete building unit of a sandwich structure and a truss element and an insulating plate for such a building unit
DK410285A DK410285A (da) 1984-09-10 1985-09-09 Byggeelement af beton med sandwich-konstruktion samt et baereelement og en isoleringsplade til et tilsvarende byggeelement
SE8504176A SE8504176L (sv) 1984-09-10 1985-09-09 Byggnadselement av betong med sandwich-konstruktion samt ett berelement och en isoleringsskiva for ett dylikt byggnadselement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI843531A FI70966C (fi) 1984-09-10 1984-09-10 Byggnadselement av betong med sandwich-konstruktion samt regelelement och isoleringsskiva foer ett dylikt byggnadselement
FI843531 1984-09-10

Publications (4)

Publication Number Publication Date
FI843531A0 FI843531A0 (fi) 1984-09-10
FI843531L true FI843531L (fi) 1986-03-11
FI70966B FI70966B (fi) 1986-07-18
FI70966C FI70966C (fi) 1986-10-27

Family

ID=8519575

Family Applications (1)

Application Number Title Priority Date Filing Date
FI843531A FI70966C (fi) 1984-09-10 1984-09-10 Byggnadselement av betong med sandwich-konstruktion samt regelelement och isoleringsskiva foer ett dylikt byggnadselement

Country Status (5)

Country Link
US (1) US4640074A (fi)
DE (1) DE3531519A1 (fi)
DK (1) DK410285A (fi)
FI (1) FI70966C (fi)
SE (1) SE8504176L (fi)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5349796A (en) * 1991-12-20 1994-09-27 Structural Panels, Inc. Building panel and method
CA2104175C (en) 1992-09-29 2003-11-04 Geoffrey W. Blaney Building block; system and method for construction using same
GB2274857B (en) * 1993-01-19 1997-01-15 Iain Norman Bridge Composite structure
DE69434917T2 (de) * 1993-05-04 2007-11-08 Foster-Miller, Inc., Waltham Gittergestützte verbundplatte mit schaumkern
US6769220B2 (en) 1996-02-08 2004-08-03 Charles E. Friesner Structural member
US5673524A (en) * 1996-04-12 1997-10-07 Alumet Building Products, Inc. Reversible composite building panel
US6088985A (en) * 1998-12-24 2000-07-18 Delta-Tie, Inc. Structural tie shear connector for concrete and insulation sandwich walls
US6761007B2 (en) * 2002-05-08 2004-07-13 Dayton Superior Corporation Structural tie shear connector for concrete and insulation composite panels
SG184578A1 (en) * 2003-04-07 2012-10-30 Life Shield Engineered Systems Llc Shrapnel containment system and method for producing same
MX2007005108A (es) * 2004-11-02 2007-09-10 Life Shield Engineered Systems Sistemas de contencion de metralla y proyectiles y metodo para producir el mismo.
KR20070094748A (ko) * 2004-12-01 2007-09-21 라이프 실드 엔지니어드 시스템스 엘엘시 파편 및 발사체 격납 시스템과 장비 및 그 제조 방법
US20080155919A1 (en) * 2006-12-29 2008-07-03 Petros Keshishian Method of manufacturing composite structural panels and using superimposed truss members with same
US8039102B1 (en) 2007-01-16 2011-10-18 Berry Plastics Corporation Reinforced film for blast resistance protection
US20120042592A1 (en) * 2009-02-27 2012-02-23 Givent Ltd. Wall element and method for producing the element
US9790406B2 (en) 2011-10-17 2017-10-17 Berry Plastics Corporation Impact-resistant film
FI124640B (fi) * 2011-12-19 2014-11-14 Peikko Group Oy Betonikuorirakenteeseen järjestetty kiinnityselementti
US9493946B2 (en) 2013-12-13 2016-11-15 Iconx, Llc Tie system for insulated concrete panels
EP3433450B1 (en) 2016-05-11 2021-10-20 Joel Foderberg System for insulated concrete composite wall panels

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE885615Q (fr) * 1964-12-14 1981-02-02 Cs & M Inc Panneaux de matiere expansee modulaires renforces
DE1609708B1 (de) * 1967-02-14 1972-03-16 Koerner Manfred Dipl Kfm Verbundanker fuer Mehrschichten-Betonplatten,Verfahren zu seiner Herstellung und damit ausgeruestete Mehrschichten-Betonplatte
DE2021192A1 (de) * 1970-04-30 1972-04-06 Schuckmann Kg Werner A Mehrschichten-Betonplatte und Verfahren zu ihrer Herstellung
FR2119833A2 (fr) * 1970-12-18 1972-08-11 Sommer Charles Henri Elements prefabriques pour la construction de petits batiments legers et batiments ainsi obtenus
US4117639A (en) * 1977-06-29 1978-10-03 Butler Manufacturing Company Reinforced insulated concrete building panel
US4297820A (en) * 1977-12-05 1981-11-03 Covington Brothers Technologies Composite structural panel with multilayered reflective core
US4336676A (en) * 1977-12-05 1982-06-29 Covington Brothers, Inc. Composite structural panel with offset core
GB2023215A (en) * 1978-06-17 1979-12-28 Luddington Enterprises Ltd Walls, floors, roofs
DE2849520A1 (de) * 1978-11-15 1980-05-29 Fricker Frimeda Metall Draht Verbindungsanker fuer eine mehrschichtenbauplatte
SE7901731L (sv) * 1979-02-27 1980-08-28 Frelena Ab Bjelklag
US4253288A (en) * 1979-07-13 1981-03-03 Chun Joo H Prefabricated wall panel
CH648889A5 (de) * 1979-11-03 1985-04-15 Haeussler Ernst Stahlbetonplatten-aggregat und verfahren zu seiner herstellung.
US4505019A (en) * 1983-03-02 1985-03-19 Deinzer Dietrich F Method of forming construction panel

Also Published As

Publication number Publication date
US4640074A (en) 1987-02-03
DK410285A (da) 1986-03-11
DE3531519A1 (de) 1986-03-20
SE8504176L (sv) 1986-03-11
FI843531A0 (fi) 1984-09-10
SE8504176D0 (sv) 1985-09-09
FI70966B (fi) 1986-07-18
DK410285D0 (da) 1985-09-09
FI70966C (fi) 1986-10-27

Similar Documents

Publication Publication Date Title
FI862414A0 (fi) Foerfarande foer belaeggning av hushaollsartiklar med ett antiadhesivt skikt och en hushaollsartikel.
FI851726L (fi) Substituerade imidazoler och triazoler samt foerfarande foer framstaellning av dessa.
FI843531L (fi) Byggnadselement av betong med sandwichkonstruktion samt foerbindningselement och isoleringsskiva foer ett dylikt byggnadselement.
FI843532A0 (fi) Byggnadselement av betong med sandwichkonstruktion samt foerbindningselement och isoleringsskiva foer ett dylikt byggnadselement.
FI851272L (fi) Anordning och foerfarande foer rynkning av ett roerformigt hoelje.
FI851538A0 (fi) Svaengboogi och raelsfordon samt stoedfoerfarande foer noedsituationer.
FI853045L (fi) Foerfarande och anordning foer borrning av ett aendspaorat haol.
FI851273L (fi) Anordning och foerfarande foer rynkning av ett roerformigt hoelje.
FI842577A0 (fi) Saett och anordning foer foertillverkning av patroner samt foer inmatning av dessa i smaeltprocessen.
FI852654A0 (fi) Modifierad zsm-5-katalysator, foerfarande foer framstaellning och anvaendning av densamma samt foerfarande foer katalytisk krackning av ett kolvaeteinmatningsmaterial.
FI870811A0 (fi) Pentapeptider med en cellvaextreglerande effekt och ett foerfarande foer framstaellning av desamma.
FI850740L (fi) Foerfarande och anordning foer kontroll av ett hoeljes aoterhaollning.
FI860418A0 (fi) Behaollare med ett integrerat utbildat ej-igenproppande och ej-laeckande punkteringsstaelle.
FI853251L (fi) Foerfarande och anordning foer korrugering av metallroer samt enligt foerfarandet framstaelld elektrisk energikabel.
FI840193A (fi) Foerfarande och anordning foer foerpackning av pastoesa livsmedel i ett flerskiktigt livsmedelhoelje samt i foervaeg foerpackad fyllhoeljesenhet foer detta foerfarande.
FI864511A0 (fi) Sluten elektrisk ackumulator samt ett foerfarande foer tillverkning av delar till densamma.
FI864297A0 (fi) Foerfarande och anordning foer framstaellning av med ett baerband foerbundna tryckbaerare.
FI843263A0 (fi) Centrifugalflaekt samt instaellningsvinggrupp och instaellningsvingserie foer dylika flaektar.
FI850866A0 (fi) Foerfarande foer avkylning av ett cylindriskt skaer och avlaegsnande av borrdamm samt en anordning foer genomfoerande av foerfarandet.
FI841296A0 (fi) Foerfarande foer maerkning av ett flytande braensle samt ett braensle maerkt enligt foerfarandet.
FI851394L (fi) Sockelelement samt foerfarande och anordning foer framstaellning av detsamma.
FI830773L (fi) Kasettflak och daermed anvaendbar slaepvagn samt kippflak av ett dragfordon.
FI844076A0 (fi) Styrsystem och anordning foer hastighetsfoeraendring av driftmotorn foer ban- och vinkelroerelsen av ett foeremaol.
FI843860L (fi) Anordning foer paobringande och vidaretransport av ett skyddsoeverdrag foer en wc-sits.
FI841599A0 (fi) Foerfarande och anordning foer maetning av ett foeremaols hoelje.

Legal Events

Date Code Title Description
MM Patent lapsed

Owner name: OY PARTEK AB