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 constructing articles with cured pressure-sensitive adhesives, the method comprising:
(i) applying a UV-curable adhesive to one side of a roofing membrane to thereby form a pre-cured coated roofing membrane, where said step of applying forms a layer of UV-curable adhesive having a thickness of at least 52 μm;
(ii) feeding said pre-cured coated roofing membrane through a cross-linking apparatus to thereby at least partially cure the layer of UV-curable adhesive, where the cross-linking apparatus includes UV-lamp and an aperture plate having an aperture through which UV electromagnetic radiation that is emitted from the UV-lamp is passed through to thereby contact the layer of UV-curable adhesive, where the UV electromagnetic radiation contacts the UV-curable adhesive in an overall exposure area, where the aperture is adapted to control the overall expose area relative to a focal point area of the UV electromagnetic radiation contacting the UV-curable adhesive, where the ratio of the focal point area to the overall exposure area is at most 5:1; and
(iii) applying a release member on to said curable adhesive after passing through said exposure area.
2. The method according to claim 1 , wherein UV electromagnetic radiation is UV light having a wavelength of either about 220 nm to about 250 nm, or about 250 nm to about 260 nm.
3. The method according to claim 2 , further comprising:
controlling an amount of radiation and an intensity of said UV light applied to said UV-curable adhesive.
4. The method according to claim 1 , further comprising:
feeding said roofing membrane through said cross-linking apparatus so that said UV-curable adhesive is subjected to UV electromagnetic radiation emitted from said UV-lamp for about 0.12 to about 50 seconds.
5. The method according to claim 1 , further comprising:
heating said UV-curable adhesive prior to applying to said roofing membrane.
6. The method according to claim 1 , where the ratio of the focal point area to the overall exposure area is at most 3:1.