Process for preparing construction articles with cured pressure-sensitive adhesives
An apparatus and related methods for constructing articles with cured pressure-sensitive adhesives comprising (i) a coater that applies a curable adhesive to a membrane; (ii) a cross-linking apparatus adapted to receive said membrane with said curable adhesive, said cross-linking apparatus comprising a light source positioned a first predetermined height above an aperture plate having an aperture therethrough, wherein said aperture plate is positioned a second predetermined height, said first predetermined height and said second predetermined height selected to define an exposure area of light emitted from said light source on to said curable adhesive to form a composite product; and (iii) a roll adapted to receive said composite product, said roll adapted to control a speed at which said membrane with said curable adhesive is exposed to light from said light source.
1. A method for preparing a polymeric roofing membrane carrying a cured pressure-sensitive adhesive layer, the method comprising:
(i) providing a polymeric membrane adapted to be used as a roofing membrane, where the membrane includes opposed planar surfaces;
(ii) providing a UV-curable adhesive coating composition that forms a pressure-sensitive adhesive upon UV curing;
(iii) applying the UV-curable adhesive coating composition to a planar surface of the polymeric membrane to thereby provide a membrane composite including a polymeric membrane with a layer of UV-curable adhesive coating composition disposed a planar surface of the membrane;
(iv) providing a curing station adapted to impart UV light energy to a substrate by transmitting UV light from a light source through an aperture and onto an exposure area of the substrate, where the aperture regulates the passage of light energy to thereby control at least one dimension of the exposure area;
(v) subjecting the layer of UV-curable adhesive coating composition disposed on said membrane to UV light energy within said curing station to thereby at least partially cure the UV-curable adhesive coating composition and form a layer of pressure-sensitive adhesive on said membrane; and
(vi) applying a release member to the layer of pressure-sensitive adhesive,
wherein the light source emits UV radiation rays, and wherein at least 60% of the UV radiation rays have an intensity of at least 200 milliWatts/cm 2 .
2. The method according to claim 1 , where said step of subjecting subjects the UV-curable adhesive to a UV dosage of from about 75 to about 125 millijoule/cm 2 .
3. The method according to claim 2 , wherein said exposure area is defined as a product of a length and a width of where light emitted from said light source contacts said curable adhesive.
4. The method according to claim 3 , wherein said exposure area includes a focal point area, wherein a ratio of said focal point area to said exposure area is at most 1:5.
5. The method according to claim 1 , where said step of applying the UV-curable adhesive coating composition to a planar surface of the polymeric membrane includes heating the UV-curable adhesive to thereby form a melted adhesive, and applying the melted adhesive to the membrane while the adhesive is in its molten state.
6. The method according to claim 5 , wherein the UV-curable adhesive is heated to a temperature of from about 120 to about 160° C.
7. The method according to claim 1 , where said step of subjecting exposes the layer of UV-curable adhesive to UV light energy for about 0.12 to about 50 seconds.
8. The method according to claim 1 , wherein said step of applying the UV-curable adhesive forms a layer of adhesive having a thickness of at least 102 μm.
9. The method according to claim 1 , further comprising the step of winding the membrane after the application of the release member on to said curable adhesive after passing through said exposure area.