Static structures (e.g. – buildings) – Machine or implement
Patent
1990-11-13
1993-05-04
Scherbel, David A.
Static structures (e.g., buildings)
Machine or implement
523094, 523098, 523099, 52408, E04B 162
Patent
active
052070476
DESCRIPTION:
BRIEF SUMMARY
SCOPE OF APPLICATION
The method, the appropriate mixing head and also the thusly fabricated insulating material can be employed wherever insulating material is produced and employed with which it is intended to provide larger roof areas in order to form an insulating and sealing layer.
The present invention relates to a method of discharging a mixture of foamed material, more particularly for a thermal insulating material, by means of a mixing head for at least two reactive compounding ingredients in the low-pressure process, consisting of a tube, inside which an agitator rotates at high speed, a mixing head for performing the method and an insulating material fabricated according to the method.
STATE OF THE ART
Mixing heads for polyurethane mixtures of foamed materials produced in the low pressure process are known. In order to distribute the material with the aid of a mixing head onto a substrate passed through underneath the mixing head, the most widely varying methods and means are employed which are subject to a great many shortcomings. Due to the high viscosity of the foamed material mixture, not even the reciprocal travel of the mixing head transversally to the direction of passage suffices to achieve the desired run of the foamed material mixture. By way of example, fish tail-shaped discharge nozzles are used. Also employed are small bore tubes, in which case the mixture is discharged with the aid of compressed air. All these forms of discharging the mixture of foamed materials subsequent to the mixing operation call for a substantial effort and do not result in the desired success of are, as e.g. the discharge effected by compressed air, hazardous to health.
Thus, from the U.S. Pat. No. 3,111,389, a method for the discharge of a foamed material mixture, more particularly for a thermal insulating material, is known in which, with the aid of a mixing head for at least two reactive compounding ingredients in the low-pressure process, consisting of a tube inside which an agitator rotates at high speed, the material readily for reaction is discharged by centrifugal, force and distributed onto a substrate in order to completely react and foam there.
The DE-OS 27 25 937 shows a rollable web of thermal insulating material comprising an insulating layer of foamed plastic material with transversally proceeding notches and a waterproof covering web attached thereupon on one side which, by preference, is bonded on, in which the insulating layer of foamed plastic material tapers between two oppositely located edges of the rectangular thermal insulating web so that the insulating strips have a wedge-shaped cross-section.
From the DE-GM 85 14 452.5, a polymer bitumen sealing web for the covering of roofs is known in which a substrate of glass fabric, non-woven or the like with an impregnation with polymeric bitumen and a sealing layer of polymeric bitumen is present, in which provision is made for the sealing layer to be constructed on its underside in the form of a separating and (vapor pressure) compensating layer, the compensating layer comprising a channel system which is made up of reciprocally crossing longitudinal and transversal grooves. Provision may also be made for the compensating layer to be constructed of stud-like projections.
OBJECT, SOLUTION, ADVANTAGES
That is why it is the object of the present invention to provide a method of the kind stated in the beginning and a device for this in which these disadvantages no longer exist and with the aid of which the discharge of foamed materials can be effected without fluctuations in quality, without interruptions due to arising preparation time and in a manner adaptable to all requirements.
For solving this technical problem, a method of the kind stated in the beginning is proposed, in accordance with which only one compounding ingredient of materials which do not react by themselves, near an external bearing of a floating shaft upon which an agitator is mounted, in the proximity of the shaft, is introduced into a mixing space and, by the action
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Scherbel David A.
Wood Wynn E.
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