Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1996-01-11
1998-05-26
Krynski, William
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428344, 428352, 4284111, 428461, 428483, 428500, 428688, 428913, B32B 300
Patent
active
057561869
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a reflector for light radiation. In particular the invention relates to a reflector used in lamp fittings or supports and having an enhanced durability: i.a. an improved scratch resistance of its outer surface and a better chemical resistance.
It is known to build up a high gloss, layered and flexible reflector substrate for lamp supports, comprising a plastic foil which allows light transmission which has a smooth outer surface and on the opposite surface of which a reflecting layer is applied. A corrosion resistant protective covering is present on the reflecting layer. This layered substrate can be bonded to the metal support by means of a suitable glue or adhesive.
Although the reflecting layer in this high gloss reflector is reasonably protected, due to the substantial thickness of the foil, its surface appears to be insufficiently hard and hence it is not scratch resistant. In other words the outer surface of the reflector has a too low abrasion resistance. In addition, the chemical resistance of the surface, i.a. against chemical cleaning agents, is unsatisfactory.
It is an object of the invention to avoid these disadvantages.
The invention meets this objective by providing a layered reflector for light radiation comprising at least at its contact side with the outer layer and which layer at its free outer surface opposite to the contact side with the bonding layer.
It is another object of the invention to provide a process for manufacturing the reflector. In particular the invention provides suitable measures for composing the layered reflector.
According to the invention this objective is achieved by using the following process steps: outer layer mentioned before. For the manufacture of the core sheet covered at its opposite side with a reflecting layer and subsequently outer surface with slip properties.
Details of the invention will now be illustrated with reference to the attached drawings and examples. Additional features and their advantages will thereby be explained.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross section view of the layered composition of the reflector according to the invention as fixed to a support.
FIG. 2 relates to the composition of a self adhesive reflector.
FIG. 3 represents a core sheet as intermediate product for the reflector.
The reflector 1 comprises as a substrate a first transparent, i.e. light transmitting resin layer 3 which has an area 7 with known slip properties at least at its contact side with the outer layer 2. This layer 3 is preferably a commercially available plastic foil, e.g. from polyester, in particular a polyetylenetereftalate foil which is covered on one side with a conventional slip coating 7 which allows easy winding and unwinding of the foil. The foil thickness is preferably between 10 .mu.m and 30 .mu.m. An optically clear foil MYLAR.RTM.D (trademark of Du Pont de Nemours) with a thickness of 23 .mu.m is well suited. A MELINEX.RTM. 442 foil (trademark of ICI) with a thickness of 12 .mu.m (and haze factor 0.5%) is equally usable. A suitable filler 14 (e.g. SiO.sub.2 particles) can be present in view of providing the required slip properties. Layer 3 can also be treated or contain additives to assure sufficient resistance to UV radiation to meet e.g. grade 5 or more of the wool scale (ISO standard 105-B01). This first resin layer 3 has on its opposite side a smooth surface in view of applying thereto afterwards a smooth reflecting layer 4. This layer, e.g. from silver, can be applied by a plasma sputtering technique (DC magnetron sputtering). Gold, aluminium or chrome can also be used as reflecting layer 4. The thickness of layer 4 will often be chosen between 0.08 and 0.2 .mu.m.
A second resin layer 5 is now fixed or bonded to the free surface of layer 4 of this double layered substrate 12 through interposition of a conventional bonding layer 6; e.g. a polyester adhesive layer. The second resin layer should not be optically clear. However it should have a slip layer 8 on its side opposite of bonding layer 6.
REFERENCES:
patent: 5014174 (1991-05-01), Won et al.
Lievens Hugo
Verheyen Pascal
Krynski William
N.V. Bekaert S.A.
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