In-line coating and curing a continuously moving welded tube with an organic polymer
First Claim
1. In a tube product of the type comprising a metal base tube with or without a zinc coating and with an overlying coating of organic polymer, the improvement comprising said coating of organic polymer consisting essentially of a thermosetting, cross-linking polyester, said polyester being triglycidyl isocyanurate (TGIC) polyester applied immediately over the metal base tube, without a primer, wherein the tube product was formed from a process including applying the TGIC polyester as a powder to the metal base tube during traveling of the tube.
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Accused Products
Abstract
A tube product and improvement in the production of coating tubing, as most preferred, includes hot dip galvanize zinc coating of tubing, and before solidification of the zinc coating, clear coating of the tubing with organic polymer coating. The heat of the hot dip cures the clear coating, and the clear coating preserves a consistency and reflectivity of the zinc previously unseen in finished products. In additional preferred embodiments, organic polymer coatings are applied to zinc coated and uncoated tubing, and the organic polymer coatings are applied by electrostatic powder coating.
49 Citations
18 Claims
- 1. In a tube product of the type comprising a metal base tube with or without a zinc coating and with an overlying coating of organic polymer, the improvement comprising said coating of organic polymer consisting essentially of a thermosetting, cross-linking polyester, said polyester being triglycidyl isocyanurate (TGIC) polyester applied immediately over the metal base tube, without a primer, wherein the tube product was formed from a process including applying the TGIC polyester as a powder to the metal base tube during traveling of the tube.
- 13. In a tube product of the type comprising a metal base tube with a zinc coating and with an overlying coating of organic polymer, the improvement comprising a polymer of a thermosetting, cross-linking polyester, said polymer consisting essentially of a thermosetting, cross-linking polyester, said polyester being triglycidyl isocyanurate (TGIC) polyester applied immediately over the metal base tube, without a primer, said polymer being clear, and wherein at least a substantial portion of said zinc coating, as observed through the clear polymer coating, has the reflectivity of chrome.
Specification