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AssigneeOMNOVA Solutions Inc.
InventorsMichael J. Hubbard, Jeannemarie DeTorre, Keith Watt, Raymond J. Weinert
Estimating the term…
A roofing membrane heat seal indicator provides a positive, visually perceptible indication that a joint or seam has been raised to a sufficiently high temperature to achieve a proper seal. The heat seal indicator is applied adjacent and parallel to an edge of a roofing membrane which will be arranged on a roof to form the upper (exposed) surface of an overlapping membrane seam. As the adjacent surfaces of the overlapped membranes are heated, heat passes through the membrane to the heat seal indicator. The heat seal indicator may be a temperature sensitive ink pigmented with material that changes color upon being subjected to a temperature indicating that the membrane surface has been subjected to a sufficiently high temperature to achieve an appropriate seal. Alternatively, the indicator may be an adhered layer of a ground or flaked polymer, such as polyethylene, which is initially opaque but melts to become translucent, thereby indicating obtainment of a proper sealing temperature. This indicator may be combined with a white or colored strip which enhances the change in the polyethylene. Another alternative comprehends the combination of a group indicator and molten polyethylene to form a pigmented polyethylene which is cooled, flaked, and adhered to roofing membranes. Another alternative is an embossed ridge or raised letters which may be covered with a thin, temperature sensitive polyvinyl chloride film or coating.
A roofing membrane and seal indicator for use in a membrane roofing installation comprising, in combination, a first roofing membrane defining a melting temperature and having a first edge and first opposed surfaces, and a temperature indicating strip disposed on one surface of said first membrane, said temperature indicating strip having a first appearance below a preselected temperature and a second, distinct appearance after having been exposed to a temperature above said preselected temperature, said preselected temperature being less than said melting temperature.
A roofing membrane having a heat seal indicator for providing an indication of proper heat application comprising, in combination, an elongate sheet of roofing membrane having a longitudinal edge and a pair of opposed surfaces and a temperature indicator disposed on one of said surfaces and along said edge, said temperature indicator having a first appearance below a preselected temperature and a second, distinct appearance after having been exposed to said preselected temperature, said preselected temperature being below a melting point of said membrane.
A roofing membrane having an indicator for providing visually perceptible evidence of sufficient heat application for sealing comprising, in combination, an elongate sheet of roofing membrane having a longitudinal edge and a pair of opposed surfaces and a temperature indicator disposed on one of said surfaces along said edge, said temperature indicator having a first appearance below a preselected temperature and a second appearance distinct from said first appearance after having been exposed to said preselected temperature, said preselected temperature being below a melting point of said membrane.
A membrane roofing assembly having a heat seal indicator comprising, in combination, a first roofing membrane having a first edge and first opposed surfaces, a second roofing membrane having a second edge and second opposed surfaces, said first and said second membranes having a common melting temperature, a portion of said second membrane disposed in overlapping relationship with a portion of said first membrane and a visual temperature indicator disposed on one of said surfaces of said portion of said second membrane, said visual temperature indicator defining a composition having a first appearance below a preselected temperature, said preselected temperature being less than said melting temperature and a second distinct, appearance after having been exposed to said preselected temperature.
Dependencies are inferred from the claim text.