CH426251A - Method of manufacturing a porous plastic object - Google Patents

Description

       

  
 



  Method of manufacturing a porous plastic object
 The present invention relates to a method of manufacturing a porous plastic article.



   Until now, plastic articles have been made with raw material, for example polyethylene, polystyrene or the like, under pressure and with thermal means. These products were then permeable or impermeable to gases, liquids and lights.



     I1 is often desirable to have more or less hard objects made of plastic material with high porosity.



   Until now, the manufacture of plastic articles has required a heavy, complicated and costly installation, as well as a specialized workforce.



   On the other hand, by the method which is the object of this invention, it is possible to manufacture an article of porous plastic material, which does not require any expensive, complicated technical installation or specialized manpower.



   The present invention makes it possible to manufacture an object of plastic material, for example, polyethylene, polystyrene or the like, with high porosity.



   The object thus prepared is characterized in that it consists of an agglomeration of particles or grains of plastic material.



   The method of making the object is characterized by the fact that plastic particles are placed in a shape and wetted with a solvent so as to bind them into a porous coherent object.



   In the attached drawing, it is shown, by way of example, the means of manufacturing, according to this process, a porous plastic tube:
 On a base 1, provided with openings 2, a cylinder is fixed which forms a male 3 and a cylindrical sleeve 4 forming the space 5, all of which is centered by a ring 6 with extension 7.



   It goes without saying that the male cylinder 3 is also centered in the base 1 by known means (point, groove or the like).



   To manufacture a cylindrical body in porous plastic, it suffices to remove the centering ring 6, then fill the space 5 with plastic particles up to the height of the cylindrical jacket 4, then pour in a solvent. appropriate in a sufficient quantity, to slide, on the male cylinder 3, the centering ring 6 and to let the solvent flow which will pass through the mass of the plastic particles by connecting them together and the surplus of the solvent will flow out through the openings 2, from the bottom 1. It will then be sufficient, without any other process or technical means, to remove the centering ring 6 and the male cylinder 3, to let the cylindrical tube thus obtained dry and to take it out of the jacket cylindrical 4.



   It is of course possible, by the same process, to economically and rapidly manufacture articles of any other desired shape, naturally using suitable shapes or molds.



   It goes without saying that this process can be used industrially to obtain, in large series and simultaneously, porous plastic objects, by automatically injecting plastic particles, for example polyethylene, into shapes or molds. , polystyrol or the like, by wetting them with a suitable solvent, automatically, and taking them out of their forms or molds, automatically and simultaneously.



   CLAIMS
 I. A method of making a porous plastic object, characterized in that plastic particles are placed in a shape and wetted with a solvent so as to bind them into a coherent, porous object.



     He. Porous plastic article obtained by the process according to claim I.
  


    

Claims (1)

SUB-CLAIMS 1. Method according to claim I for the manufacture of a tubular object, characterized in that particles of plastic material, for example polyethylene, polystyrene or the like, are introduced into the space (5), on the particles are poured an appropriate solvent and then the whole is closed by a centering ring (6) which gives, by its extension (7), the final height of the tube, and after the solvent has flowed through the openings (2), removing the male cylinder (3), the centering ring (6), the bottom (1), the porous plastic tube being finished is immediately, after a drying time, usable. 2. Method according to claim I for the manufacture of a porous object of any shape in plastic material, for example polyethylene, polystyrene or the like, characterized in that particles of plastic material are introduced in several shapes. or molds similar to the desired object and, after wetting with a suitable solvent, are automatically and simultaneously extracted from their shapes or molds.