Insulating preform

Abstract

An insulating preform made of a mass of glass fiber resembling wool obtained by extreme bulking of glass fiber and by a support for the glass wool, the support including a net being of the same material of the glass wool and defined by a non bulked glass strand. The glass wool and the net are held together so as to make geometrical shapes without any glue and/or impregnating substance.

1 . A method for producing an insulating preform including a mass of mass of glass threads resembling wool, obtained by extreme bulking of glass fiber in form of increasing the volume of the glass fiber as much as possible, and a support for holding the glass wool, the method including the steps of: 
 inflating a strand of glass fiber by means of the air jet generated by a nozzle, thus forming a mass of glass fibers;    providing a support for the inflated glass fiber from non bulked strand of glass fibers, the support having a conformation corresponding to its use.    
     
     
         2 . A method according to  claim 1 , wherein the support taking a form a kinnd of container or a false wall complementary to a wall raised or removed of the component into which the preform is to be inserted.  
     
     
         3 . A method according to  claim 1 , wherein the support is obtained by blowing in the glass wool through a net made of fiber glass strands.  
     
     
         4 . A method according to  claim 2 , wherein the net is stiffened by means of a starch.  
     
     
         5 . An insulating preform as obtained by the method of  claims 1  to  4 , including a mass of mass of glass threads resembling wool, obtained by extreme bulking of glass fiber in form of increasing the volume of the glass fiber as much as possible, and a support for holding the glass wool, the support being formed by a net made of the same material as the glass wool and defined by a strand of non-bulked glass in the form of a strand of glass fiber, the glass threads resembling wool and the net being held together, due to elastic reaction of the bulked glass fiber, to form geometrical shapes without any help from glue and/or impregnating substances, these shapes corresponding to the use of the preform.  
     
     
         6 . A preform as in  claim 5 , characterized in that the net is compacted to define a cloth.  
     
     
         7 . A preform as in  claim 5 , characterized in that at least the part of the net that does not match any real wall is stiffened by means of a selected substance.  
     
     
         8 . A preform as in  claim 5 , characterized in that at least the part of the net that does not match any real wall is coated with a layer of material such as to prevent air passage from inside the preform to outside and vice-versa.  
     
     
         9 . A preform as in  claim 8 , characterized in that the layer of material is metallic.  
     
     
         10 . A preform as in  claim 5 , characterized in that the support has shape of a container that defines a seat for receiving said glass wool.  
     
     
         11 . A preform as in  claim 5 , characterized in that the support has a false wall co-operating with a real wall to define a seat for receiving said glass wool.