EP1523601A1 - Procede de production en continu de panneaux isolants dotes d'organes de fixation a taquets - Google Patents

Procede de production en continu de panneaux isolants dotes d'organes de fixation a taquets

Info

Publication number
EP1523601A1
EP1523601A1 EP02767836A EP02767836A EP1523601A1 EP 1523601 A1 EP1523601 A1 EP 1523601A1 EP 02767836 A EP02767836 A EP 02767836A EP 02767836 A EP02767836 A EP 02767836A EP 1523601 A1 EP1523601 A1 EP 1523601A1
Authority
EP
European Patent Office
Prior art keywords
fasteners
panels
strip
sheets
spacers
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.)
Withdrawn
Application number
EP02767836A
Other languages
German (de)
English (en)
Inventor
Maurizio Morandi
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.)
Metecno SpA
Original Assignee
Metecno SpA
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 Metecno SpA filed Critical Metecno SpA
Publication of EP1523601A1 publication Critical patent/EP1523601A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/61—Connections for building structures in general of slab-shaped building elements with each other
    • E04B1/6108—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together
    • E04B1/612—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces
    • E04B1/6183—Connections for building structures in general of slab-shaped building elements with each other the frontal surfaces of the slabs connected together by means between frontal surfaces with rotatable locking means co-operating with a recess

Definitions

  • the invention relates to the manufacture of insulating panels used for the construction of cold-storage chambers, prefabricated structures and the like. These panels have the usual composite "sandwich" structure where a layer of insulating material, usually expanded polyurethane, is arranged between two outer faces made of sheet metal, plastic, fibreglass or other material.
  • the panels herein considered are assembled together by means of special latch fasteners; the latter essentially consist of hook latches operated by cam or eccentric mechanisms which are housed in cases incorporated in the polyurethane and positioned along the edges of the panels so as to co-operate with the associated fasteners of an adjacent panel.
  • the insulating panels referred to above are manufactured individually using a method according to which their components are first prepared on the plate of a press, using special frames to position the latch fasteners, and afterward the polyurethane is injected following the closing of the press, in order to allow it to expand.
  • Such a method has the typical limitations of a discontinuous cycle, namely a productivity which cannot reach high levels because the panels are manufactured individually; it is therefore unsuitable for large scale industrial production.
  • the present invention aims to improve this state of the art.
  • the invention arises from the realisation of the Applicants that in order to achieve a continuous manufacturing process, the latch fasteners must be fixed onto the faces of the panels so that when the polyurethane expands, they remain in the correct position.
  • the object of the invention is therefore achieved by a method in which the faces of the panels are fed in a predefined direction and the latch fasteners (or the spacers thereof) are fixed onto them.
  • the latch fasteners may be applied only along the longitudinal sides of the faces or also along the transverse sides thereof.
  • FIG. 1 is a plan view of a plant for the continuous manufacturing of panels in accordance with the present invention
  • FIG. 2 is a perspective and partially sectioned view of a latch fastener mounted on a support, during a step of the method carried out by the plant of Fig. l;
  • FIG. 3 and 4 show respective steps involving fixing of a spacer to a metal sheet during the method carried out by the plant of Fig. 1 ;
  • FIG. 5 and 6 show a cross-sectional view of the latch fasteners with associated support sections during respective steps of the method carried out by the plant of Fig. 1;
  • - Fig. 7 shows a top plan view of the mounting phase assembly of latch fasteners on support sections, with a partially cut-away portion so as to show the hooks;
  • - Figs. 8 and 9 show a cross-sectional view of latch fasteners with associated support sections, during further steps of the process carried out the above plant.
  • FIG. 1 With reference to the first of these figures, there it is shown in schematic form a plant for the continuous manufacturing of insulating panels for refrigerating rooms, which extends along a single line although for reasons of space on the sheet of Fig. 1 it has been divided into two sections joined by a broken line.
  • the aforementioned plant is intended in particular for the processing of panels having sheet-metal outer faces; for this purpose it includes a first reel 1 from which a metal strip used to form the upper face of the panels is unwound.
  • the strip is processed in a manner known per se by a straightener 2 and coated with a plastic protective film (for example polythene) by an applicator 3, of the known type too; both straightening and coating of the strip are not necessary, however, and could in principle be eliminated from the production cycle.
  • a plastic protective film for example polythene
  • the strip reaches a cutting and bending station 4 where it is cut into rectangular sheets 5 of predefined length, whose corners are then trimmed, and which are folded along their front and edges 5a and 5b.
  • a cutting and bending station 4 for forming the bottom face of the panels, in the plant of Fig. 1 there is provided a second reel 11 from which a respective metal strip is unwound, at a lower level than the first one.
  • the second strip after passing through a straightener 12 and a polythene applicator 13 reaches a cutting-bending-punching station 14, where it is cut into rectangular sheets 15 whose corners are then trimmed, and which are folded along the front and longitudinal edges 15a and 15b.
  • the station 14 also performs punching of a series of holes 16 in the bottom strip advancing along the line, before it is cut into sheets; these holes are formed both along the edges of the strip and transversely thereto, and are intended for application of latch fasteners 17 in the successive stations 18, 19 and 20.
  • the first two of these stations apply the fasteners along the longitudinal edges 15b of the sheets 15, while the third station places them along the transverse edges 15 a.
  • Tubular spacers 21 with a widened base are fixed to the holes 16 present on the sheets 15, said spacers having the function of preventing the expanded material from obstructing access, from the outside, to the cam actuating the hooks.
  • the systems for fixing the spacers 21 may change depending on the dimensions of the panels, the thickness of their external faces, the spacers, the type of latch fastener and other factors.
  • the aforementioned fixing system is of the mechanical type, obtained by means of clinching of the metal sheet with a punch 22 after arranging the spacer 21 thereon, the latter being joined to a collar 23 formed around the hole 16 by the clinching operation: the interference between the joined surfaces keeps the spacer 21 fixed in position (Figs. 3 and 4).
  • the latch fasteners 17 are mounted on them; this occurs in two separate ways, depending on whether the devices are arranged along the front edges 15a or longitudinal edges 15b of the sheets 15.
  • support sections 25 are prepared off the production line (cf. Figs. 5-9), which have seats 27 at a predefined distance from each other for pins 28; the latter are engaged by the hooks 29 of the fasteners 17, which are thus made solid with the sections 25 and may therefore be positioned along the front edges 15a of the metal sheets 15 (Fig. 5). Thereafter, in the station
  • the transverse supports 25 with the fasteners preassembled on them are lowered so as to cause engagement of a projection 30 present thereon, with the top end of the spacers 21 (Fig. 6).
  • the transverse support sections 25 are symmetrical since the devices 17 are applied to them on both sides. It follows therefore that once the fasteners are associated with the respective spacers 21 as explained above, the metal sheets 15 are connected to each other forming a chain which advances along the line as if it were a single strip.
  • the configuration, during this step, of the system formed by the bottom sheets 15 connected by sections 25 and devices 17, is shown in Fig. 7; in this connection it should be just pointed out that the latch fasteners 17 are of the dual- purpose type, i.e. they are each provided in addition to the hook 29 of a pin (not shown in the drawings) with which the hook of another fastener may engage, so that they connect together.
  • Such means may be mechanical arms which grip the fasteners one at a time and then apply them onto a spacer, or hydraulic, electromechanical, pneumatic, suction-pad and other systems suitable to handle several fasteners at the same time and place them on the spacers; an example of this solution is shown in Fig. 2 where 31 denotes an application bar which contains a series of pins 32 similar to those already seen above.
  • the hooks 29 of the fasteners are rotated using spanners 33 inserted from above into corresponding openings 34 present therein, thereby becoming disengaged from the pins 32 so that the application bar 31 may be moved away from the edge 15b of the bottom sheets 15 moving along the plant.
  • the spanners 33 may be operated pneumatically, electromechanically, hydraulically or in similar ways, but also manually; it is further obvious that the hooks 29 might be rotated from underneath, by inserting the spanners 33 through the spacers 21.
  • the upper sheets 5 are associated with the chain of bottom sheets 15 advancing along the line by being placed between two consecutive support sections 25.
  • the latter are provided with upper teeth 38 against which the front edges 5 a of the upper sheets 5 come into contact, said edges being advantageously bent in a manner matching the profile of the teeth 38 thereby ensuring a seal preventing leakage of the polyurethane during the subsequent expansion thereof.
  • the bottom sheets 15 have front edges 15a which are bent so as to match the bottom teeth 39 present on the support section 25.
  • the chain of facing sheets 5 and 15 connected by the transverse sections 25 are in the condition shown in Fig. 8 and are made to pass into an oven 40, in order to be heated before application of the polyurethane.
  • a seal 41 made of rubber or similar material is preferably applied between the teeth 38 and 39 of each transverse section 25.
  • the polyurethane is injected in a manner known per se by using a nozzle bar 45 inserted between the bottom and top sheets 5, 15 and extracted in a transverse direction with respect to them when, following their advancing movement, the support sections 25 meet the bar.
  • a continuous press 50 where polymerization of the polyurethane occurs; this press comprises, two pairs of belts arranged along the sides of the sheet chain (namely at the top, at the bottom, and along the sides thereof), which restrain the increase in volume and the forces resulting from polymerization of the polyurethane.
  • an insulating layer 51 of polyurethane foam is therefore present between the sheets 5 and 15, as can be seen in Fig. 9; thereafter, a station 52 for extracting the support sections 25 removes the latter from the line, so that the panels may be considered completed.
  • the panels are then conveyed away by a rollerway 54 located at the end of the plant, towards a palletizing machine 55 and a wrapping machine 56.
  • this plant allows the series production on an industrial scale of panels which are currently manufactured in a discontinuous manner; this is made possible by the operating steps of the manufacturing process.
  • the latch fasteners are made solid with one of the faces of the panels, which in the example described above is the one corresponding to the bottom sheets 15. This allows the subsequent application of the insulating material, in the same way as for normal insulating panels.
  • a first of these steps consists in associating the latch fasteners with one of the faces of the panels, i.e. the bottom sheets 15; in the example described above this is obtained by fixing firstly the tubular spacers 21 onto the metal sheet and then mounting the fasteners 17 on top of them.
  • the latch fasteners are kept in the required position by means of peripheral frames which have the shape of the perimeter of the panels and are also present during foaming; a system of this kind is, however, not compatible with the continuous manufacturing of panels, in particular those panels in which the latch fasteners are arranged only along the longitudinal edges, which will be explained more fully below.
  • Another important step of the process according to the invention which allows the continuous manufacturing of panels, is the connection in chain-like succession of the bottom sheets 5, which is achieved by means of the transverse support sections 25. Indeed it can be easily understood that in this way the continuity of the strips, which were initially cut into sheets, is restored so as to allow feeding along the plant of a continuous semifinished product, which may undergo a foaming process like that used for the continuous production of ordinary insulating panels.
  • the method according to the invention is also applicable to panels having latch fasteners on two sides only, and not on four sides, like for example the panels used for cold structures (buildings, warehouses, etc.) other than rooms.
  • the latch fasteners are present only along the longitudinal edges 15b and not along the transverse edges; consequently, in order to manufacture the panels, it is no longer necessary to cut the strips unwound from the reels 1 and 11 into sheets of predefined length and then connect them together using the transverse sections 25 as explained above.
  • the manufacturing process implemented by the plant according to Fig. 1 is therefore simplified with respect to the preceding process, in that the strips unwound from the respective reels I and 11 are fed continuously and there is no longer the step of transverse cutting thereof carried out by the stations 4 and 14, but only the step of punching the holes 16; similarly, the station 20 (i.e. the station for insertion of the support sections 25) will be excluded from the cycle since the spacers and the latch fasteners are applied only along the longitudinal sides of the strips, at the stations 18 and 19.
  • the application of the polyurethane is also simplified because the nozzle bar 45 must no longer be moved away from the operating position, when the transverse support sections 25 pass by it.
  • the plant in Fig. 1 is provided with a transverse shear 53 which operates in place of the station 52 for removing the transverse sections 25, which are absent from the continuous semifinished product advancing along the production line.
  • polyurethane is the most suitable insulating material for the process according to the invention, it would also be possible to use in place thereof other materials, including non-expanded materials such as rock or glass wool.
  • the metal sheet may be replaced by plastics sheet or sheet of other than metal.
  • the process according to the invention has the advantage that it may be carried out using a multi-purpose plant, namely a plant suitable to produce also ordinary insulating panels or in any case panels without latch fasteners. Indeed, as stated above the operating steps of the process allow to bring it back to a manufacturing process, similar to that for producing ordinary insulating panels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

L'invention concerne un procédé de production en continu de panneaux isolants dotés d'organes de fixation à taquets (17). Ce procédé comprend une étape d'exploitation durant laquelle les organes de fixation sont fixés sur une bande ou une feuille métallique (15) qui avance le long de la ligne de fabrication, au moyen d'une entretoise (21) associée à ladite ligne. Ainsi, lorsque le polyuréthanne, ou un matériau isolant similaire, du panneau se développe, les organes de fixation restent dans leur position préréglée sans qu'il soit nécessaire d'utiliser des cadres de positionnement externes.
EP02767836A 2002-07-19 2002-07-19 Procede de production en continu de panneaux isolants dotes d'organes de fixation a taquets Withdrawn EP1523601A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2002/000479 WO2004009923A1 (fr) 2002-07-19 2002-07-19 Procede de production en continu de panneaux isolants dotes d'organes de fixation a taquets

Publications (1)

Publication Number Publication Date
EP1523601A1 true EP1523601A1 (fr) 2005-04-20

Family

ID=30471477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02767836A Withdrawn EP1523601A1 (fr) 2002-07-19 2002-07-19 Procede de production en continu de panneaux isolants dotes d'organes de fixation a taquets

Country Status (3)

Country Link
EP (1) EP1523601A1 (fr)
AU (1) AU2002330740A1 (fr)
WO (1) WO2004009923A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202200000410A1 (it) * 2022-01-13 2023-07-13 Saip Surl Apparecchiatura di pressa a doppio nastro per la produzione di pannelli di frigoriferi

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341233A (en) * 1965-02-04 1967-09-12 Cushman Kenneth Vantine Locking mechanism
US3671006A (en) 1970-07-01 1972-06-20 Kason Hardware Corp Refrigerator wall panels with panel fasteners and apparatus for making said panels
US3784240A (en) 1972-06-23 1974-01-08 Kason Hardware Corp Panel fastener
JPH056403Y2 (fr) * 1985-08-30 1993-02-18
US6299244B1 (en) 2000-08-08 2001-10-09 Patent Holding Company Lightweight vehicle body panels and method of blow molding vehicle body panels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004009923A1 *

Also Published As

Publication number Publication date
AU2002330740A1 (en) 2004-02-09
WO2004009923A1 (fr) 2004-01-29

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