CN107091043A - A kind of stalk inorganic compounding hollow fire door - Google Patents

A kind of stalk inorganic compounding hollow fire door Download PDF

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Publication number
CN107091043A
CN107091043A CN201710387532.9A CN201710387532A CN107091043A CN 107091043 A CN107091043 A CN 107091043A CN 201710387532 A CN201710387532 A CN 201710387532A CN 107091043 A CN107091043 A CN 107091043A
Authority
CN
China
Prior art keywords
door
inorganic
hollow
panel
fire
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201710387532.9A
Other languages
Chinese (zh)
Inventor
吴义强
肖俊华
刘元
吕建雄
卿彦
左迎峰
李新功
李贤军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central South University of Forestry and Technology
Original Assignee
Central South University of Forestry and Technology
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 Central South University of Forestry and Technology filed Critical Central South University of Forestry and Technology
Priority to CN201710387532.9A priority Critical patent/CN107091043A/en
Publication of CN107091043A publication Critical patent/CN107091043A/en
Pending legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B1/00—Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings
    • E06B1/04—Frames for doors, windows, or the like to be fixed in openings
    • E06B1/34—Coverings, e.g. protecting against weather, for decorative purposes
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B1/00—Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings
    • E06B1/04—Frames for doors, windows, or the like to be fixed in openings
    • E06B1/52—Frames specially adapted for doors
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • E06B3/7001—Coverings therefor; Door leaves imitating traditional raised panel doors, e.g. engraved or embossed surfaces, with trim strips applied to the surfaces
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
    • E06B5/161—Profile members therefor
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/20—Doors, windows, or like closures for special purposes; Border constructions therefor for insulation against noise
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • E06B2003/7046—Door leaves with provisions for locks, hinges or other fittings
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • E06B2003/7049—Specific panel characteristics

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Special Wing (AREA)

Abstract

The invention discloses a kind of stalk inorganic compounding hollow fire door, including door leaf, doorframe, door lock and hinge for fireproof, doorframe is fixed in the edge of door leaf, hinge for fireproof is arranged on the side of door leaf, door lock is arranged on the opposite side of door leaf, door leaf includes the first decorative panel, the second decorative panel, Hollow Inorganic door panel, the first side plate and the second side plate, Hollow Inorganic door panel is hollow-core construction, first decorative panel and the second decorative panel are fixed on the principal plane of Hollow Inorganic door panel relatively, and the first side plate and the second side plate are fixed on the side of Hollow Inorganic door panel relatively.The present invention has fire prevention suppression cigarette, waterproof, anti-aging, the function such as antifreeze, Anti-moth-eating, and fire-protection rating reaches A2 grades, and magnesium system inorganic coagulation material is decomposed under the high temperature conditions can produce the chlorine with fire-extinguishing function concurrently.The hollow-core construction of inorganic door panel, makes door panel density only 500kg/m3Left and right, effectively reduces the weight of fire resistant doorsets, adds fire resistant doorsets heat insulating and sound insulating performance.

Description

A kind of stalk inorganic compounding hollow fire door
Technical field
The present invention relates to fire resistant doorsets field, a kind of stalk inorganic compounding with fireproof fire-extinguishing function is specifically referred to hollow anti- Vent and fireproof door frame.
Background technology
Fire is to threaten public safety, endangers one of the disaster of people's lives and properties, it caused many to human society The heavy losses of life, property.With the development of social productive forces, the wealth of society increasingly increases, and fire damage rises and fire The general trend that damaging range expands is objective law.Fire resistant doorsets are one of critical facilitys that Building Fire Protection separates, fiery with preventing Gesture spreads the effect spread with flue gas, is played an important role for reducing fire damage.
Existing conventional fire resistant doorsets are mainly fire metal door and fire-proof wooden door, and fire metal door surface coats one layer of resistance Burning coating material, although be difficult to be burned out, but the high temperature of metallic door conduction can equally light the article of surrounding, it is fire-retardant in high temperature Coating can also be produced toxic gas by thermal decomposition, and fire metal door is heavier, and inconvenience is installed.The fire-proof wooden door master of in the market If filling the incombustible materials such as rock wool, powder extinguishing agent, perlite inside door leaf, produced during carrying, installation and use Raw vibrations are easily caused fire proofing material sedimentation, cause fire resistant doorsets top hollow, cause fire resistant doorsets fire-proof and thermal-insulation effect to decline, and And price is higher, once panel is burnt when occurring fire, interior fire protection material, which will be dropped out, makes forfeiture fire separation function.
The content of the invention
The present invention is intended to provide a kind of fireproof fire-extinguishing, the integral type stalk inorganic compounding hollow fire door of environmentally friendly light weight and anti- Vent frame, to solve the above problems.
To achieve the above object, the invention discloses a kind of stalk inorganic compounding hollow fire door, including door leaf, doorframe, Door lock and hinge for fireproof, the doorframe are fixed in the edge of the door leaf, and the hinge for fireproof is arranged on the side of the door leaf, The door lock is arranged on the opposite side of door leaf, the door leaf include the first decorative panel, the second decorative panel, Hollow Inorganic door panel, First side plate and the second side plate, the Hollow Inorganic door panel are hollow-core construction, first decorative panel and the second decorative panel phase To being fixed on the principal plane of the Hollow Inorganic door panel, first side plate and the second side plate are fixed in described hollow relatively On the side of inorganic door panel.
Further, the built-in binding site for being arranged on the door leaf and the doorframe of the hinge for fireproof, it is described anti- Fiery hinge is made of high-temperature alloy, and its top finishing has fire resistant coating.
Further, the door lock is one kind of handle lock, ball lock, insertion-core lock and slow-witted lock.
Further, the doorframe includes doorjamb, door guard plate and sheathing, and the doorjamb and door guard plate are mutually solid Connect, the sheathing is fixed in the both sides of the doorjamb.
Further, the door guard plate is the inorganic stalk board of fire-retardant and smoke-inhibiting type.
Further, the doorjamb and door guard plate are extruded from using the inorganic step of stalk one of fire-retardant and smoke-inhibiting type, or are used The inorganic integrated gluing of stalk board is made.
Further, the sheathing on the doorjamb is inorganic stalk board through milling shape, engraving, veneer, spray painting or printing In one or more be made.
Further, the Hollow Inorganic door panel is that magnesium system inorganic coagulation material and crushed straw aggregate are compound by being squeezed into Type technique is made, and inside is the hollow cylinder structure through door panel.
Further, the Hollow Inorganic door panel is solid construction at the second side plate, and the hinge for fireproof is close Installed at second side plate.
Further, the first panel, second panel, the first side plate and the second side plate is in veneer, finishing papers It is any.
Compared with prior art, the advantage of the invention is that：
Door leaf and fireproof door frame of the present invention are all using new inorganic stalk compound material, and inorganic stalk board is inorganic using magnesium system Binder materials is adhesive, is combined and is made up of techniques such as cold pressing, hot pressing with crushed straw aggregate, inorganic hollow door panel then passes through Extrusion process is made.It is a kind of environmental protection, can follow closely can saw and can carve, with fire prevention suppression cigarette, waterproof, anti-aging, antifreeze, anti- The sheet material for the features such as damaging by worms, fire-protection rating reaches chlorination magnesium component in A2 grades, and magnesium system inorganic coagulation material in high temperature bar The chlorine with fire-extinguishing function concurrently can be produced by being decomposed under part, flame can be made to extinguish as soon as possible.The hollow-core construction of inorganic door panel, makes door Core plate density is only 500kg/m3Left and right, effectively reduces the weight of fire resistant doorsets, adds fire resistant doorsets heat insulating and sound insulating performance.And Hollow Inorganic door panel is a step extrusion forming in the extruder of setting width in the present invention, without cutting edge sawing etc., second Solid construction at side plate facilitates the installation of hinge for fireproof, compared with commonly foaming door panel fire resistant doorsets, without cohering wooden door Very, Hollow Inorganic door panel is makes door panel integral, it is therefore prevented that glue-line comes off and causes door leaf to drop fire resistant doorsets at high temperature Situation.
Below with reference to accompanying drawings, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is stalk inorganic compounding hollow fire door disclosed in the preferred embodiment of the present invention and fire resistant doorsets schematic front view；
Fig. 2 is the schematic cross-sectional view of doorframe disclosed in the preferred embodiment of the present invention；
Fig. 3 is the schematic cross-sectional view of door leaf disclosed in the preferred embodiment of the present invention.
Marginal data：
1st, hinge for fireproof；2nd, doorframe；201st, doorjamb；202nd, sheathing；203rd, door guard plate；3rd, door leaf；301st, the first side plate； 302nd, the first decorative panel；303rd, Hollow Inorganic door panel；304th, the second side plate；305th, the second decorative panel；4th, door lock.
Embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be defined by the claims Implement with the multitude of different ways of covering.
Stalk inorganic compounding hollow fire door as shown in Figure 1 includes hinge for fireproof 1, doorframe 2, door leaf 3 and door lock 4；Such as Doorframe 2 shown in Fig. 2 includes doorjamb 201, sheathing 202 and door guard plate 203；Door leaf 3 as shown in Figure 3 includes the first side plate 301st, the first decorative panel 302, Hollow Inorganic door panel 303, the second side plate 304 and the second decorative panel 305.
Hollow Inorganic door panel 303 as shown in Figure 3 is provided with hollow parts, and the second side plate 304 is pasted on adhesive Solid section, the first side plate 301 is then pasted on opposite side, and the first decorative panel 302 and the second decorative panel 305 are pasted on Hollow Inorganic The two sides of door panel 303, the first side plate 301, the first decorative panel 302, the second side plate 304 and the second decorative panel 305 can be single for wood One or both of plate or wood decoration paper, door leaf two sides can again be painted, be carved, milling decorative pattern, printing etc..Optionally, Also can be without the first decorative panel 302 and the second decorative panel 305, milling decorative pattern and spray painting etc. directly on Hollow Inorganic door panel 303.
In the present embodiment, door leaf 3 and doorframe 2 are all using new inorganic stalk compound material, and inorganic stalk board is adopted It is made up with magnesium system inorganic coagulation material by adhesive and crushed straw aggregate are compound of techniques such as cold pressing, hot pressing, Hollow Inorganic door core It, by extrusion process, is a kind of environmental protection that plate 303, which is made of then, and can follow closely can saw and can carve, with fire prevention suppression cigarette, waterproof, The sheet material of the features such as anti-aging, antifreeze, Anti-moth-eating, fire-protection rating reaches the chlorination in A2 grades, and magnesium system inorganic coagulation material Magnesium component is decomposed under the high temperature conditions can produce the chlorine with fire-extinguishing function concurrently, flame can be made to extinguish as early as possible.
In the present embodiment, doorframe 2 as shown in Figure 2 is made up of the inorganic stalk board of fire-retardant and smoke-inhibiting type, wherein door in doorframe 2 Frame 201 and the integrative-structure that door guard plate 203 is a step extrusion forming；If using the integrated glue molding of inorganic stalk board, door Frame 2 then includes doorjamb 201 and the two parts of door guard plate 203, and door guard plate 203 can be according to outward opening fire resistant doorsets or swing-in fire resistant doorsets The upside or downside that doorjamb 201 is connected to air nail with being glued, the both sides of doorjamb 201 are respectively arranged with sheathing 202, wherein The Edge Distance doorjamb 201 of sheathing 202 and the side 0-30mm of door guard plate 203.
In the present embodiment, the hollow-core construction of Hollow Inorganic door panel 303, makes door panel density only 500kg/m3It is left The right side, effectively reduces the weight of fire resistant doorsets, adds fire resistant doorsets heat insulating and sound insulating performance.And Hollow Inorganic door panel in the present invention 303 be a step extrusion forming in the extruder of setting width, without cutting edge sawing etc., the solid construction at the second side plate 304 Facilitate the installation of hinge for fireproof 1, compared with commonly foaming door panel fire resistant doorsets, without cohering wooden stile, Hollow Inorganic door core Plate 303 is makes door panel integral, it is therefore prevented that glue-line comes off the situation for causing door leaf 3 to drop fire resistant doorsets at high temperature.
Further, in the present embodiment, stalk inorganic compounding hollow fire door as shown in Figure 1, hinge for fireproof 1 passes through spiral shell Nail is connected to another concave side for connecting door guard plate 203 in the solid section side of door leaf 3 and doorframe 2 on doorjamb 201, door Lock 4 is mounted remotely from the door leaf of hinge for fireproof 1, and door lock 4 can be handle lock, ball lock, insertion-core lock or slow-witted one kind locked.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (10)

1. a kind of stalk inorganic compounding hollow fire door, it is characterised in that described including door leaf, doorframe, door lock and hinge for fireproof Doorframe is fixed in the edge of the door leaf, and the hinge for fireproof is arranged on the side of the door leaf, and the door lock is arranged on door leaf Opposite side, the door leaf include the first decorative panel, the second decorative panel, Hollow Inorganic door panel, the first side plate and the second side plate, The Hollow Inorganic door panel is hollow-core construction, and first decorative panel and the second decorative panel are relative to be fixed in the Hollow Inorganic On the principal plane of door panel, first side plate and the second side plate are relative to be fixed on the side of the Hollow Inorganic door panel.
2. stalk inorganic compounding hollow fire door according to claim 1, it is characterised in that the hinge for fireproof is built-in The binding site of the door leaf and the doorframe is arranged on, the hinge for fireproof is made of high-temperature alloy, its top finishing There is fire resistant coating.
3. stalk inorganic compounding hollow fire door according to claim 1, it is characterised in that the door lock be handle lock, One kind of ball lock, insertion-core lock and slow-witted lock.
4. stalk inorganic compounding hollow fire door according to claim 1, it is characterised in that the doorframe includes door side Frame, door guard plate and sheathing, the doorjamb and door guard plate are fixedly connected with each other, and the sheathing is fixed in the two of the doorjamb Side.
5. stalk inorganic compounding hollow fire door according to claim 4, it is characterised in that the door guard plate is fire-retardant suppression The inorganic stalk board of cigarette type.
6. stalk inorganic compounding hollow fire door according to claim 4, it is characterised in that the doorjamb and door guard plate It is extruded from, or is made of the integrated gluing of inorganic stalk board using the inorganic step of stalk one of fire-retardant and smoke-inhibiting type.
7. according to any described stalk inorganic compounding hollow fire doors of claim 4-6, it is characterised in that on the doorjamb Sheathing by inorganic stalk board through milling shape, engraving, veneer, spray painting or printing in one or more be made.
8. stalk inorganic compounding hollow fire door according to claim 7, it is characterised in that the Hollow Inorganic door panel It is made up by magnesium system inorganic coagulation material and crushed straw aggregate are compound of extrusion forming process, inside is the open circles through door panel Rod structure.
9. stalk inorganic compounding hollow fire door according to claim 8, it is characterised in that the Hollow Inorganic door panel It is solid construction at the second side plate, the hinge for fireproof is installed at second side plate.
10. stalk inorganic compounding hollow fire door according to claim 9, it is characterised in that the first panel, second Panel, the first side plate and the second side plate are any of veneer, finishing paper.
CN201710387532.9A 2017-05-27 2017-05-27 A kind of stalk inorganic compounding hollow fire door Pending CN107091043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710387532.9A CN107091043A (en) 2017-05-27 2017-05-27 A kind of stalk inorganic compounding hollow fire door

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710387532.9A CN107091043A (en) 2017-05-27 2017-05-27 A kind of stalk inorganic compounding hollow fire door

Publications (1)

Publication Number Publication Date
CN107091043A true CN107091043A (en) 2017-08-25

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ID=59639809

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710387532.9A Pending CN107091043A (en) 2017-05-27 2017-05-27 A kind of stalk inorganic compounding hollow fire door

Country Status (1)

Country Link
CN (1) CN107091043A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0805255B1 (en) * 1996-05-02 2002-09-18 Riexinger Türenwerke GmbH Fire protection door
CN101824861A (en) * 2010-04-19 2010-09-08 勉县大众建材有限公司 Method for manufacturing straw compound material fire-proof plate
CN101845932A (en) * 2010-06-23 2010-09-29 吉林延边林业集团珲春森林山木业有限公司 Inflaming retarding fireproof door
CN201677378U (en) * 2010-03-22 2010-12-22 叶林 Plant fiber decorative sheet
CN104563806A (en) * 2013-10-28 2015-04-29 天津浦安防火科技有限公司 Method for manufacturing straw environment-friendly fireproof door core plate
CN205532122U (en) * 2016-01-28 2016-08-31 北京科力菲尔材料有限公司 Fire door is prevented to steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0805255B1 (en) * 1996-05-02 2002-09-18 Riexinger Türenwerke GmbH Fire protection door
CN201677378U (en) * 2010-03-22 2010-12-22 叶林 Plant fiber decorative sheet
CN101824861A (en) * 2010-04-19 2010-09-08 勉县大众建材有限公司 Method for manufacturing straw compound material fire-proof plate
CN101845932A (en) * 2010-06-23 2010-09-29 吉林延边林业集团珲春森林山木业有限公司 Inflaming retarding fireproof door
CN104563806A (en) * 2013-10-28 2015-04-29 天津浦安防火科技有限公司 Method for manufacturing straw environment-friendly fireproof door core plate
CN205532122U (en) * 2016-01-28 2016-08-31 北京科力菲尔材料有限公司 Fire door is prevented to steel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
倪贵林: "《现代木质门窗生产技术》", 30 August 2011 *

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Application publication date: 20170825