Releasably mutually-adherent materials
AssigneeJames Frederick John Johnson
InventorHarold W. M. Pook
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Abstract
A combination of two mutually-adherent laminae is applied to the removable fixing of display or decorative material. A first lamina of PVC is a component of a tri-laminate, including an aluminum foil intermediate layer and a paper backing layer. The backing layer allows the tri-laminate to be secured to a display board or wall, for example using a wallpaper type paste. The display or decorative material is in the form of a sheet, which is laminated using an adhesive to the front surface of a second lamina of polyester terephthalate. When said bi-laminate is pressed into intimate surface contact with the exposed front surface of the lamina it adheres strongly thereto, but can readily be peeled off and replaced when this is required.
Claims10
A combination of two mutually-adherent plastics polymer laminae, having different but compatible physical and electrical characteristics whereby respective surfaces thereof are mutually adherent when pressed into surface contact, comprising:
- a first lamina having a permanent or quasi-permanent electrostatic charge of negative polarity produced by electret charges in said lamina and a ductile polished surface providing a relatively high degree of surface friction;
- and
- a second lamina which either has a positive electrostatic charge or is capable of being polarised by induction to acquire such a charge, which has a stable polished surface and which is of high tensile strength;
- said first lamina having a trapped compensating electrostatic charge on its other surface by virtue of a closely disposed element attached to that surface.
Dependencies are inferred from the claim text.