Laminated waterproofing material containing asphalt and method of making it

A waterproofing material comprising;

• a biaxially oriented polyester film having a plurality of perforations therein;
• a first layer of asphalt on one side of said polyester film;
• and
• a second layer of asphalt which is thicker than said first layer of asphalt and having embedded therein a weather resistant material amounting to a substantial portion of the composition of said second layer;
• wherein a plurality of columns of asphalt extend through said perforations in said polyester film to interconnect and integrally joining the two layers of asphalt together, said columns of asphalt having a cross sectional area comprising a substantial portion of the lateral area of said waterproofing material.

A method of manufacturing a laminated material, comprising the steps of:

• (a) unrolling a desired length of plastic film having a plurality of perforations therein;
• (b) applying molten asphalt to both surfaces of the unrolled plastic film;
• (c) squeezing said plastic film, with the molten asphalt on both surfaces thereof, so that the asphalt is forced through the perforations in said plastic film to integrally join both asphalt layers together;
• and
• (d) cooling said laminated material.

A method of manufacturing waterproofing material, comprising the steps of:

• (a) unrolling a continuous polyester film having a plurality of perforations therein;
• (b) applying molten asphalt to both surfaces of the unrolled polyester film to form layers thereon;
• (c) squeezing said polyester film, with the molten asphalt on both surfaces thereof, so that the asphalt is forced through the perforations in said polyester film to integrally join both asphalt layers together;
• (d) depositing and impregnating a weather resistant material in at least one asphalt surface;
• and
• (e) cooling said waterproofing material.

A laminated material comprising:

• a layer of plastic film having a plurality of spaced apart perforations therein;
• and
• a layer of asphalt on one side of said the plastic film;
• wherein said layer of asphalt and said plastic film are joined to one another by columns of said asphalt extending through the perforations in the plastic film with the ends of the columns flattened to form column heads attaching the asphalt to the film.

A method of manufacturing a laminated material, comprising the steps of:

• (a) providing a strip of plastic film having a plurality of perforations therein;
• (b) applying extrudable asphalt to a surface of the plastic film;
• (c) squeezing said plastic film, with the asphalt on surfaces thereof, so that the asphalt is extruded through the perforations in said plastic film and spreading the columns on the surface of the film remote from the applied asphalt to form heads to intimately join the asphalt layer and the film together;
• and
• (d) cooling said laminated material.

A method of manufacturing a laminated material, comprising the steps of:

• (a) providing a strip of asphalt film having a plurality of perforations therein;
• (b) providing a strip of asphalt on both surfaces of the plastic film;
• (c) squeezing said plastic film, with the asphalt on both surfaces thereof, so that the asphalt is extruded through the perforations in said plastic film to integrally join both asphalt layers together;
• and
• (d) cooling said laminated material.