IL28505A - Process and apparatus for the production of building boards - Google Patents

Description

C O H E N Z E D E K S P I S B A C H R E G PAT E N T AT TO R N EYS LEVONTIN 1169 T E L A V V P A T E N T S D E S I S O D I N A N C E SPECIFICATION PROCESS AND APPARATUS FOB THE PRODUCTION BUILDING BOARDS HERBERT PRIGNITZ trading as of DO HEREBY DECLARE the nature of this invention and in what manner the same is to be performed to be particularly described and ascertained in and by the following statement This invention relates to the production of layer building having a layer of foamed plastics material such as polyurethane bonded on one face to a layer of strong facing material such as bitumen whereas the opposite of the foamed plastics material layer has no facing layer or a facing layer which consists only of tively material as metal and which does not project beyond the outline of the foamed plastics material It is known to apply a strong facing material for example in the form of bitumen to a foamed plastics material layer produced by itself and then into individual This has been done by means of an hesive substance such as hot cold or by means of a synthetic resin in order to guarantee adhesion of the facing material to the foamed plastics material layer over the largest surface area the application of pressure has been necessary for a more or less considerable time depending on the type of glue this is and with the known method of applying and fixing the facing material by means of a glue it is not always possible to guarantee a flush secure connection over the entire surface between the facing material and the previously produced foamed plastics material This the particularly when using the boards as roofing of the facing material becoming detached and of undesirable bubble formation between the facing material and the foamed plastics material layer of the board owing to vapour According to the present invention there is provided a method of producing a building board having a facing material is carried on a moving conveyor belt under a foaming constituents of the plastics material to be foamed are fed in liquid state from a nozzle of the foaming head on to the upper face of the strong facing material to form a foamed plastics material layer a fabric is run substantially parallel to and above the facing material on the conveyor belt into the foamed plastics material as the latter is and the foamed plastics material layer is allowed to harden and bond to the facing material layer and fabric web to form a composite structure from which a building board of the required length is severed versely to the direction of movement of said said fabric web serving to compensate for shrinkage stresses set u on hardening of the foamed plastics The high adhesive force of the foamed plastics material itself produces a particularly intimate connection with the facing material and fabric thereby obviating reliably the risk of the facing becoming detached from the foamed plastics material under conditions of use to which the buildings board is subsequently and also permitting the continuous production of building boards provided at the set with a facing in the continuous type process which is particularly economical for large scale production Since the foamed plastics material constituen s are applied in the liquid state to the strong facing so that the foamed plastics material layer while gradually cooling and therefore hardening bonds securely to the facing material layer over the entire contact unless special tions are taken undesirable deformation would be almost more particularly bending of the owing material displaces tho masking atrip the or perforations in tho bolt 14 and follows tho to form the projections limited in its expansion by the masking Tho othor conveyor belt 10 can also bo covered by a strip of this 15 is a foaming heed having a through which tho constituents of the plastics material be foamed are fed in a liquid state downwards on to tho of bitumen A fabric 16 for tho fabric insert in tho foamed plastics material layer 1 is to run into the forming continuous run of foamed a guide roller 17 which is vertically The position of the fabric 16 in the vertical within the foaraod plastics materiel 12 conbo controlled by the g roller Instead of a guide roller it would also be to provide a guide cylinder or a guide The position in the sense of tho web of fabric 16 within plastics material is so chosen that the fabric accepts to such an forces occurring in tho material as a result of the shrinkage which takes place on hardening that undesirable deformation of the plane board such as shown in Figure 1 is The correct height can be ascertained easily few The foamed plastics rising between the belts through the fabric web 16 from below if an adequately fabric is If a rolativoly fabric is is advisable to the foaming head as shown in the fied form of apparatus according to Figure 4 in such a that the combined plastics constituents to aro discharged the forcing head tho fabric web plastics 12 as tho upper board o directly below upper facing layer Spraying in the liquid state fabrio web 16 the result sticks to the anddevelops a foain The web thus and surrounded foam then more easily the foamed plasties material below its ivithout being visible and contacting any upper facing layer and thereby adhesive is in is to support the fabrio web before running under tho foaming head 15 against tho discharge pressure of the foamed plastics material from the of the foaming by providing a guide device in the of cylinder or bar 18 arranged transversely to the direction of movement of the continuous said roller or the like being vertically This process can be used wherever boards of a hardening foamed plastics as a continuous run subjected to the risk of undesirable by shrinkage stresses owing to the provision of facing material on one side onl or the provioion of unequal strength facing on two sides of the material Figure 5 illustrates a building board of the construction as the building board shown i Figure but here a facing layer 22 applied to the material layer 21 projects at and at two neighbouring edges of the board in order to enable forming a closed surface when several such are laid for on a Tho fabric inserted in the foamed material layer is this for as a continuous This comprises lower ng conveyor bolt and upper 25 26 The belts ore guided in known over rollera given ond provided with The space between the or and 26 in which the foamed plastics notorial layer and is of the belts is bounded laterally by stationar rails of for example or instead of these rails there can be endless with vertically operative surfaces tho lateral boundaries and running in the same direction as the conveyor bolts and 29 is a foaming head for feeding the constituents of the plantics material to foamed in a liquid As 6 indicates the constituents issue from tho head 29 onto individual material pieces 30 laid on the belt 2 With these facing material tho lower supporting bolt 2 and the upper bolt the gradually hardening continuous layer of foamed material moves between the lateral towards the left in the arrangement shown in Figure lower belt extends a considerable distance in front of tho foaming head the foaming head on its loding in the direction of is provided abutment which is aligned with the appropriate rail and which is intended to facilitate the lateral of the facing material pieces on the belt The individual facing material pieces 50 for forming the board designated 22 in 5 are applied successively in such a manner to the bolt in the region upstream of the foaming head the individual pieces overlap one the of t e uniform dimensioning of the of overlap and of length tho core in of a gauge rectangular in this which downwardly one ond tho effective length of the gauge in the tion of travel of the belts and 26 corresponding to the length of tho plastics material layers 21 to bo produced tho cutting loss which later on in the when the material The other end 33 of the gauge 31 forms a projecting abutment when the gauge is applied to tho belt with its end towards tho side of Figures 6 and 7 in contact with the leading ond of a piece already situated on tho belt as a boundary against which the leading end of the next facing abuts when applied to the conveyor bolt and thereby ensures that the facing material piece correctly In Figures G and 9 those parts of the apparatus are which follow the parts of the apparatus illustrated in Figures 6 end tho direction of to the The composite structure by the already hardened portion of the continuous run of plastics material with tho facing material pieces which are adhered securely to its underside and whic overlap in each a projecting portion 23 of the neighbouring facing is pushed out towards tho left between the conveyor belts 25 and 26 in the direction and arrives at an elongated delivery if and on to which it can For only a portion of the delivery tablo indicated in in a In the region after conveyor able circular saw at of tho two sides of the continuous is in the cane the to given a edge 24 at one of the run in Figure tho shaft of the blade 39 above the foamed plasties run to bo mobile t thereto tho vortical and 3 s so as its height by fooler roller along the projecting a that the continuous run of plastics material is severed at its edge at this side only as far as the projecting edge For this the feeler roller 37 on a rocker which carries a driving rootor with belt drive for tho saw blado which is also on the the facing material is not to project at tho opposite edge of the continuous the saw blado there can be given a larger than the saw blade that it cuts completely through tho plastics material and facing material piece in the longitudinal Downstream of this there i3 means for separating a building board tho structure already formed by cutting the plastics layer hear tho transverse edge of the upper o two facing pieces overlapping one ar in the direction of travel of tho belt 3aid of a irst carriage 40 which on rails 41 in the direction of travel of the pl on this carriage is a second carriage 43 which runs the direction of travel on rails and which carries a circular saw in addition to a driving motor On the c 40 is also provided a plunger 36 serving to clomp this on a larger scale fa Figure The hook is lifted slightly time a finished building board is and then falls in of tho front edge of tho in order to tho relative position of tho 40 nod relative to Tho saw on tho carriage la so arranged and dimensioned that it a straight cut can be carried out through tho continuous of plastics material or at right angles to the direction of movement of tho as far as tho facing piece without tho portion thereof without interrupting tho further movement of the continuous run of foamed plastics material and tho carriage For the apparatus shown in Figures 6 to 9 is illustrated and described in detail only as far as its main elements are It will bo apparent that or obvious weans for further in detail more particularly for developin and automating its control can be used in conjunction with As Figure 11 the lateral rails 27 between the conveyor belts 25 26 are spaced from the supporting surface of the convoyor to permit passage unde the rails of tho facing material pieces in order that the facing material con travel through the with a lateral projection at one or both sides If a lateral projection of tho facing is only inquired at one side of the board only one rail 27 need be spaced sufficiently from the belt to permit pan of the facing material pieces If it is not desired have a rejecting portion of the facin material at the board ends in tho direction of of tho of plasties individual pieces 30 not be to tho c nveyor bolt 25 before application of tho On tho contrary in ouch it is sufficient to the facing material run a aupply of tho head 29 an web on to the supporting conveyor bolt facing material laps longer provided and the instead of tho hook ber otherwise process in carried out in tho way and the apparatus for r out the process can be the with tho difforonco that tho saw blade lo so dimensioned or that it cuts completely tho continuous run of foamed plastics material together with tho facing insufficientOCRQuality

Claims (1)

1. A method according to any ono of 1 to in which the feeing material is to laterall beyond one edge of the foamed material A method according to any one of claims 1 to in which a layer of facing weaker than said strong facing material bonded of plastics layer opposite to the face to which said strong facing material layer is Apparatus for carrying out themethod claim including a movable endless conveyor belt arranged to and carry a length of strong facing a foaming head having a through which constituents plastics material to be can bo in liquid state on to the surface of the strong facing material when the latter present on the conveyor belt and is moved under the foaming head ns for running a fabric in operation of the into the foamed plastics material as the latter is formed facing and means a building board of the required J in operation of the from a composite structure operation of the apparotus by hardened foamed plastics material bonded to the facing material and the fabric Apparatus according to claim including a guide device for the control of the height of the fabric web running into the foamed plastics material the is formed which guide device is vertically adjustable above the belt and is arranged of said foaming head transversely to the conveyor having a lengt in of travel of the conveyor corresponding to of the building board to be duced the cutting and having at the end to said one end abutment the gauge is operatively located with said end abutting against a end of a piece lying conveyor enaures that the next facing material piece applied to the conveyor the end of said next piece contacts the correctly Apparatus according to wherein said or severing a building board frora said composite atructuro includes a device for the hardened plastics material layer at the transverse leading edge of a facing material piece overlapping the next facing material piece in the direction of travel of the convey or said device incorporating a first carriage which is mounted for in travel direction he c conveyor by of a pivotable hook member adapted to the edge of each facing waterial piece by means of a plunger operable to clamp the first carriage fast to hardened plastics material layer for ment a second carriage mounted on said for displacement transversely to the direction of 1 travel of the conveyor belt and a circular saw which is mounted on the second carriage and is operative ment of caid structure to sever the hardened foamed plastics m layer fabric web without cutting through the projecting overlapped trailing tho respective facing material Apparatus to any of 12 including two boundaries for foamed material when on the conveyor eac by a rail or by an bolt whose operative surface is located in a vertical one said boundaries from conveyor to permit the passage under said one boundary a laterally projecting portion of the when the latter is present on the conveyor Apparatus according to claim including a device located downstream of foaming head said device circular blades located so as to be one on each side of the hardened foamed plastics material the latter present in the with each said circular saw blade being mounted on a shaft arranged to extend above and transverse to the hardened foamed plastics material which shaft is vertically movable controlled by a roller arranged to in operation of the apparatus along the laterally projecting portion of the facing material and having a so that in operation the hardened foamed plastics material layer is laterally trimmed by the trimming device without cutting the laterally projecting portion of the facing A method of producing a building board substantially as hereinbefore described with reference to the Apparatus for carrying out the of claim 1 substantially as hereinbefore described with reference to the accompanying A building board when produced by the method substantially as hereibefore with reference to the accompanying COHEN SPISBACH 53116 TEL AVIV Attorneys for the Applicant insufficientOCRQuality