CN110142338B - Moulding bed for arc-shaped plate of metal composite curtain wall and thermal compounding process - Google Patents
Moulding bed for arc-shaped plate of metal composite curtain wall and thermal compounding process Download PDFInfo
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- CN110142338B CN110142338B CN201910443847.XA CN201910443847A CN110142338B CN 110142338 B CN110142338 B CN 110142338B CN 201910443847 A CN201910443847 A CN 201910443847A CN 110142338 B CN110142338 B CN 110142338B
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- arc
- curtain wall
- die
- bearing platform
- metal composite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/88—Curtain walls
- E04B2/90—Curtain walls comprising panels directly attached to the structure
- E04B2/92—Sandwich-type panels
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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
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/02—Temperature
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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
- B32B2607/00—Walls, panels
Abstract
The invention discloses a forming die for a metal composite curtain wall arc-shaped plate, which comprises an arc-shaped die surface, a bearing platform support, a forming die base and a die surface bearing platform. According to the invention, the mould is designed to be small and flexible, so that the matched automatic production line operation is convenient to realize, the automation degree is effectively improved, the whole tyre film is convenient to disassemble and assemble, more than 90% of materials can be reused, and the rest materials can be reused after secondary processing, so that the waste of tyre film materials is reduced to the maximum extent, and the manufacturing cost is reduced; the whole tyre mould of the invention adopts metal materials, has excellent heat-conducting property and unique cavity design, ensures direct conduction of temperature, ensures that heat is efficiently conducted to a product from a heating device by matching with a hot-pressing compound device, shortens the pressing time of the product, ensures that the stress is uniformly released when the tyre mould expands with heat and contracts with cold by virtue of a tyre mould structure and an edge point type fixing mode, and avoids the problem of local deformation.
Description
Technical Field
The invention belongs to the technical field of building curtain walls, and particularly relates to a forming die for a metal composite curtain wall arc-shaped plate and a thermal composite process.
Background
The processing of traditional arc metal composite board has two kinds: one is after the compound molding, cut the inner panel into the multistage with the cutting saw, then bend and shape with the child mould, reuse the auxiliary material to fix and shape; the other is a process of pressing into arc and then compounding, according to the building modeling requirement, using metal materials such as wood or steel plates, aluminum plates and the like to manufacture a matched moulding bed with the same radian, firstly pre-bending the rolled and formed panel and back plate, then placing the panel or back plate on the formed moulding bed, manually distributing glue and filling core materials, then compounding the back plate or the panel, and then adopting an upper die to add balance weight or adopting a single-die film-covering and vacuumizing compounding process to carry out pressing. The working temperature is generally room temperature or heat preservation measures are taken, and a heating device is covered on the surface or in a heat preservation room.
The processing after the composite molding has problems:
1-1) the cutting depth is shallow, and the arc is not easy to bend and form uniformly; the cutting depth is too large, so that obvious creases are easily seen on the panel at the cutting part, and the forming and using effects of the outer plate are affected.
1-2) the cutting distance is large, the straight section part in bending can not be bent, and only bending can be carried out at the cutting part, so that the fold line effect is easy to cause, but not uniform arc forming. The cutting space is small, and can be basically even become the arc, but the high density slotting process easily causes inner panel and core to drop, even with the setting spare fixed, has also seriously destroyed whole board intensity.
1-3) because the cutting seam has a space and the cutting depth can not be cut to the panel position of the outer panel, the folding mark is easy to appear at the socket part after bending, and the appearance effect of the socket part is influenced.
2) The existing process for compounding after forming an arc by pressure in advance has the problems that:
2-1) because the arc radius of the metal composite curtain wall board changes with different building requirements, the metal composite curtain wall board is made into a forming die by wood, and after being used, the metal composite curtain wall board can not be used for the second time in subsequent projects and only can be used as a waste. When the metal material is used, a welding process is basically adopted, on one hand, welding stress is easy to generate during welding, and in use, particularly after heating, the welding stress is easy to generate self deformation, so that product defects are caused. And the work of removing the forming die after the production is finished is labor-consuming and laborious, and a small part of usable materials can be used subsequently after the welding seam is polished, so that the material loss is overlarge.
On the other hand, the tire mold is made into a structure with adjustable radian, but the structure is complex, the adjusting range is small, the flexibility is poor, the body shape is large, heating measures are not convenient to take after the product is compounded so as to improve the compounding efficiency, and the product occupies a large space to be stored when not used, so that the space is wasted.
Disclosure of Invention
The invention aims to provide a forming die for an arc-shaped plate of a metal composite curtain wall, which aims to solve the problems in the background technology. The device has the characteristics of simple structure, high automation degree, reduction of manufacturing cost, improvement of product production efficiency and guarantee of product bonding performance through thermal compounding.
The invention also aims to provide a thermal compounding process of the arc-shaped plate of the metal composite curtain wall.
In order to achieve the purpose, the invention provides the following technical scheme: a forming die for a metal composite curtain wall arc-shaped plate comprises an arc die surface, a bearing platform support, a forming die base and a die surface bearing platform; the upper end of the base of the forming die is evenly provided with a bearing platform support, the upper end of the bearing platform support is provided with an arc-shaped groove, the arc die surface is installed in the arc-shaped groove in the upper end of the bearing platform support, fixing holes are evenly formed in the periphery of the arc-shaped groove in the upper end of the bearing platform support, and the die surface bearing platform is fixed in the fixing holes in the upper end of the bearing platform support.
In the invention, the arc die surface, the bearing platform support, the base of the forming die and the die surface bearing platform are made of recyclable metal materials.
Furthermore, the arc die surface, the bearing platform support, the tire die base and the die surface bearing platform are convenient to disassemble and assemble, more than 90% of materials can be reused, and the rest materials can be reused after secondary processing, so that the waste of tire film materials is reduced to the maximum extent, and the production cost is greatly reduced.
In the invention, the metal fastener for fixing the arc die surface is further positioned outside the effective working area and can ensure that the arc die surface does not deform during working.
In the invention, the metal fastener for fixing the arc die surface is further positioned outside the effective working area and can ensure that the arc die surface does not deform during working.
In the invention, the penetrating fixing structure further ensures that the arc die surface and the die surface bearing platform expand with heat and contract with cold together after being connected and fixed, and the stress is released.
Further in the present invention, and directly connected to the conveying structure.
Further in the present invention, the surface of the arc mold surface is smooth and has no scratch.
Further, the thermal compounding process of the arc-shaped plate of the metal composite curtain wall comprises the following steps:
(1) shaping: the novel forming die is used for bending and forming the metal plate of the arc-shaped plate of the metal composite curtain wall, and the metal plate is placed at the upper end of the arc-shaped die surface to realize forming;
(2) gluing: the thermoplastic environment-friendly binder is adopted, and a high-pressure non-contact atomization spraying process is adopted, so that the glue is uniformly mixed and fully reacted, the bonding performance is guaranteed, the bonding strength of the plate is higher than that of the traditional plate by more than 50%, the bonding rate is 100%, the durability is better, and the integrity, the strength and the flatness of the panel are guaranteed;
(3) filling: automatic core material filling is realized, dust-free cotton cutting and hinge type cotton distribution are realized, manual sheet crossing is distinguished, the overall strength of the plate is improved, the labor intensity of operators is reduced, and the working environment is improved;
(4) compounding the back plate;
(5) and (3) laminating: and (3) after compounding, performing static hot pressing, and controlling the temperature to be about 70 ℃, so that the product is uniformly heated, the binder is uniformly and stably reacted, the cohesiveness is stronger, the pressure conduction is uniform, the panel and the core material are uniformly contacted, the bonding is stronger, the pressurizing precision is high, and the pressure and the temperature required by the panel and the binder are accurately reached.
In the method for realizing the forming die for the arc-shaped plate of the metal composite curtain wall, the arc die surface, the bearing platform support, the forming die base and the die surface bearing platform are made of recyclable metal materials; the arc die surface, the bearing platform support, the moulding bed base and the die surface bearing platform are convenient to disassemble and assemble, more than 90% of materials can be reused, and the rest materials can be reused after secondary processing, so that the waste of moulding bed materials is reduced to the maximum extent, and the production cost is greatly reduced; the arc die surface, the bearing platform support, the moulding bed base and the die surface bearing platform are fixed in a penetrating manner, so that rigid connection such as welding is avoided, and the problem of stress release deformation during normal-temperature and high-temperature use is avoided; the whole body of the tire membrane adopts a unique cavity design and is directly connected with a conveying structure; the surface of the arc die surface is smooth and has no scratch.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the mould is designed to be small and flexible, so that the matched automatic production line operation is convenient to realize, the automation degree is effectively improved, the whole tyre film is convenient to disassemble and assemble, more than 90% of materials can be reused, and the rest materials can be reused after secondary processing, so that the waste of tyre film materials is reduced to the maximum extent, and the manufacturing cost is reduced;
2. the whole tire mold is made of metal materials, has excellent heat conducting performance and unique cavity design, ensures direct conduction of temperature, is matched with hot-pressing composite equipment, ensures that heat is efficiently conducted to a product from heating equipment, shortens the product pressing time, improves the production efficiency and ensures the product delivery period; the even release of stress when guaranteeing expend with heat and contract with cold avoids local deformation problem, and formula fixed knot that wears promptly guarantees expend with heat and contract with cold together after arc die face and die face cushion cap are connected fixedly, stress release.
3. According to the invention, during thermal composite processing, dust-free cotton cutting and hinge type cotton distribution are realized by automatic core material filling, and the method is different from manual sheet crossing, so that the overall strength of the board is improved, the labor intensity of operators is reduced, and the working environment is improved;
4. the thermal compounding process of the invention leads the product to be heated evenly, the reaction of the binder to be even and stable, the caking property to be stronger, the pressurizing precision to be high, the pressure and the temperature required by the plate and the binder to be accurately reached, and the durability and the appearance quality effect to be enhanced by static hot pressing after compounding.
5. The tire mold structure fully considers the gluing and hot pressing in the subsequent process, effectively ensures the heat and the bearing pressure, and further can ensure that the adhesive can play the maximum bonding role.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic view of the structure of the bearing platform support of the present invention;
in the figure: 1. an arc die face; 2. a bearing platform support; 3. a base of the molding bed; 4. and (4) a die face bearing platform.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides the following technical solutions: a forming die for a metal composite curtain wall arc-shaped plate comprises an arc die surface 1, a bearing platform support 2, a forming die base 3 and a die surface bearing platform 4; wherein, the upper end of the base 3 of the forming die is evenly provided with a bearing platform support 2, the upper end of the bearing platform support 2 is provided with an arc groove, the arc die surface 1 is arranged in the arc groove at the upper end of the bearing platform support 2, the periphery of the arc groove at the upper end of the bearing platform support 2 is evenly provided with a fixing hole, and the die surface bearing platform 4 is fixed in the fixing hole at the upper end of the bearing platform support 2.
Further, the arc die surface 1, the bearing platform support 2, the moulding bed base 3 and the die surface bearing platform 4 are made of recyclable metal materials.
Furthermore, the arc die surface 1, the bearing platform support 2, the tire die base 3 and the die surface bearing platform 4 are convenient to disassemble and assemble, more than 90% of materials can be reused, and the rest materials can be reused after secondary processing, so that the waste of tire film materials is reduced to the maximum extent, and the production cost is greatly reduced.
Further, the arc die surface 1, the bearing platform support 2, the tire die base 3 and the die surface bearing platform 4 are fixed in a penetrating mode, rigid connection such as welding is avoided, and the problem of stress release deformation during normal-temperature and high-temperature use is avoided.
Furthermore, the whole body of the tyre membrane adopts a unique cavity design and is directly connected with the conveying structure.
Further, the surface of the arc die surface 1 is smooth and has no scratch.
Further, the thermal compounding process of the arc-shaped plate of the metal composite curtain wall comprises the following steps of:
(1) shaping: the novel forming die is used for bending and forming the metal plate of the arc-shaped plate of the metal composite curtain wall, and the metal plate is placed at the upper end of the arc-shaped die surface 1 to realize forming;
(2) gluing: the thermoplastic environment-friendly binder is adopted, and a high-pressure non-contact atomization spraying process is adopted, so that the glue is uniformly mixed and fully reacted, the bonding performance is guaranteed, the bonding strength of the plate is higher than that of the traditional plate by more than 50%, the bonding rate is 100%, the durability is better, and the integrity, the strength and the flatness of the panel are guaranteed;
(3) filling: automatic core material filling is realized, dust-free cotton cutting and hinge type cotton distribution are realized, manual sheet crossing is distinguished, the overall strength of the plate is improved, the labor intensity of operators is reduced, and the working environment is improved;
(4) compounding the back plate;
(5) and (3) laminating: and (3) after compounding, performing static hot pressing, and controlling the temperature to be about 70 ℃, so that the product is uniformly heated, the binder is uniformly and stably reacted, the cohesiveness is stronger, the pressure conduction is uniform, the panel and the core material are uniformly contacted, the bonding is stronger, the pressurizing precision is high, and the pressure and the temperature required by the panel and the binder are accurately reached.
Further, the arc die surface 1, the bearing platform support 2, the moulding bed base 3 and the die surface bearing platform 4 are made of recyclable metal materials; the arc die surface 1, the bearing platform support 2, the moulding bed base 3 and the die surface bearing platform 4 are convenient to disassemble and assemble, more than 90% of materials can be reused, and the rest materials can be reused after secondary processing, so that the waste of moulding bed materials is reduced to the maximum extent, and the production cost is greatly reduced; the arc die surface 1, the bearing platform support 2, the moulding bed base 3 and the die surface bearing platform 4 are fixed in a penetrating manner, so that rigid connection such as welding is avoided, and the problem of stress release deformation during normal-temperature and high-temperature use is avoided; the whole body of the tyre membrane adopts a unique cavity design and is directly connected with a conveying structure; the surface of the arc die surface 1 is smooth and has no scratch.
When the arc-shaped plate of the metal composite curtain wall is processed, a processing worker carries out bending and shaping on the metal plate of the arc-shaped plate of the metal composite curtain wall through the novel forming die and realizes shaping by placing the metal plate at the upper end of the arc-shaped die surface 1; then, a thermoplastic environment-friendly binder is adopted, and a high-pressure non-contact atomization spraying process is adopted, so that the glue is uniformly mixed and fully reacted, the bonding performance is guaranteed, the bonding strength of the plate is higher than that of the traditional plate by more than 50%, the bonding rate is 100%, the durability is better, and the integrity, the strength and the flatness of the panel are guaranteed; through related mechanical automatic core material filling, dust-free cotton cutting and hinge type cotton distribution are realized, the method is different from manual sheet crossing, the overall strength of the plate is improved, the labor intensity of operators is reduced, and the working environment is improved; through the static hot pressing after compounding, temperature control is about 70 ℃ for the product is heated evenly, the binder reaction is even stable, and the cohesiveness is stronger, and the pressure conduction is even simultaneously, and panel, core contact are even, guarantee to bond stronger, and the pressurization precision is high, accurately reach panel and binder required pressure and temperature, and the workshop production actual measurement realizes that production efficiency improves more than 200% than traditional technology.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a compound curtain child mould for arc which characterized in that of metal: comprises an arc die surface (1), a bearing platform support (2), a moulding bed base (3) and a die surface bearing platform (4); wherein, the upper end of child mould base (3) evenly is provided with two at least cushion cap supports (2), and cushion cap support (2) adopt the fastener to be connected with child mould base (3), the upper end of cushion cap support (2) is provided with convex recess, the convex recess edge in upper end of cushion cap support (2) evenly is provided with the fixed orifices, and die face cushion cap (4) penetrate the fixed orifices of cushion cap support (2), and the fixed orifices is convex to form 0 to 180 degrees radian breach on cushion cap support (2), die face cushion cap (4) penetrate the fixed orifices of cushion cap support (2) and constitute the arc along with the pitch arc of the convex recess of cushion cap support (2) and support the concave surface, arc die face (1) are fixed on fashioned die face cushion cap (4) with metal fastener.
2. The forming die for the arc-shaped plate of the metal composite curtain wall as claimed in claim 1, wherein: the die surface bearing platform (4) and the bearing platform support (2) can move; the bearing platform supports (2) are five in number and have the same distance between every two.
3. The forming die for the arc-shaped plate of the metal composite curtain wall as claimed in claim 1, wherein: the metal fastener for fixing the arc die surface is positioned outside the effective working area and can ensure that the arc die surface (1) does not deform during working.
4. The forming die for the arc-shaped plate of the metal composite curtain wall as claimed in claim 1, wherein: the circular arc-shaped groove at the upper end of each bearing platform support (2) is the same as the fixed hole in layout.
5. The forming die for the arc-shaped plate of the metal composite curtain wall as claimed in claim 1, wherein: the fetal membranes are directly connected with the conveying structure.
6. The forming die for the arc-shaped plate of the metal composite curtain wall as claimed in claim 1, wherein: the surface of the arc die surface (1) is smooth and has no scratch.
7. The thermal compounding process of the arc-shaped plate of the metal composite curtain wall is characterized by comprising the following steps of:
(1) shaping: the forming die for the arc-shaped plate of the metal composite curtain wall is used for bending and forming the metal plate of the arc-shaped plate of the metal composite curtain wall, and the metal plate is placed at the upper end of the arc-shaped die surface (1) to form a shape;
(2) gluing: adopting thermoplastic environment-friendly adhesive and spraying the adhesive in a high-pressure non-contact atomization manner;
(3) filling: automatic core material filling;
(4) compounding the back plate;
(5) hot-pressing composite shaping: and (5) standing and hot pressing after compounding.
8. The thermal compounding process of a metal composite curtain wall arc plate of claim 7, wherein: the static hot pressing temperature is controlled to be 60-80 ℃, so that the product is heated uniformly, the binder reaction is uniform and stable, the pressure conduction is uniform, and the panel and the core material are contacted uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910443847.XA CN110142338B (en) | 2019-05-27 | 2019-05-27 | Moulding bed for arc-shaped plate of metal composite curtain wall and thermal compounding process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910443847.XA CN110142338B (en) | 2019-05-27 | 2019-05-27 | Moulding bed for arc-shaped plate of metal composite curtain wall and thermal compounding process |
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| CN110142338A CN110142338A (en) | 2019-08-20 |
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| CN111546542B (en) * | 2020-06-23 | 2022-05-27 | 江苏铁锚玻璃股份有限公司 | Large-curvature organic glass forming die and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0976009A (en) * | 1995-09-14 | 1997-03-25 | Shirayama:Kk | Manufacture of attachment fitting for curtain wall |
| JP2005324255A (en) * | 2005-06-17 | 2005-11-24 | Nakajima Steel Pipe Co Ltd | Method for manufacturing round steel tube |
| CN203900245U (en) * | 2014-05-20 | 2014-10-29 | 安徽联盟模具工业股份有限公司 | Lower die of bending machine and laminated-type combined indentation-free bending lower die device |
| CN205217798U (en) * | 2015-12-24 | 2016-05-11 | 江西鑫隆泰建材工业有限公司 | Circular arc board mould of buckling |
| CN207205010U (en) * | 2017-05-27 | 2018-04-10 | 惠州市三力实业有限公司 | A kind of sliceable bending die |
| CN108453470B (en) * | 2018-02-01 | 2019-09-20 | 山东鸿星新材料科技股份有限公司 | A kind of metal covering composite curtain wall board production technology |
| CN208533805U (en) * | 2018-06-26 | 2019-02-22 | 深圳市宝鹰建设集团股份有限公司 | The connector of curtain wall round bar and main structure |
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Denomination of invention: A kind of tire mold and thermal composite process for arc plate of metal composite curtain wall Effective date of registration: 20221024 Granted publication date: 20210720 Pledgee: Societe Generale Bank Limited by Share Ltd. Binzhou branch Pledgor: SHANDONG GLOBAL STAR NEW MATERIAL TECHNOLOGY CO.,LTD. Registration number: Y2022980019561 |
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