Beach umbrella with a transparent or translucent film canopy which allows sunlight to pass but filters out ultraviolet rays

Abstract

This invention relates to a type of sunshade that has the distinctive feature of allowing sunlight and heat to pass, but prevents the passage of ultraviolet rays. The device, of conventional configuration, has a film consisting of three layers. Each layer consists of copolymers. Additives are added to these layers to absorb and stabilize ultraviolet rays. The invention allows the user, at the beach for example, to sunbathe and feel its warmth, while being protected from the damaging effects of ultraviolet rays.

Claims

1. A beach umbrella translucent to sunlight while filtering out ultraviolet rays, wherein the canopy consists of a transparent film consisting of: three layers of copolymers joined by co-extruding the copolymers in one film, the three layers having a transparency of greater than ninety percent; a first layer and a third layer forming opposing exterior layers made of polyethylene; a second, intermediary layer, is made of an ethyl vinyl acetate copolymer having 18% vinyl acetate, and allowing less than one percent of ultraviolet rays to pass through the intermediate layer; and the three layers further consisting of additives of amines sterically blocked and benzophenone, the amines sterically blocked having an ultraviolet protection rating of greater than eighty according to the European standard ultraviolet index.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 depicts the transparent film (1) being applied to the structure of the sunshade;

(2) FIG. 2 depicts the structure of a conventional sunshade, with the film (1) already applied;

(3) FIG. 3 shows a detailed, cross section of the film (1) having three layers consisting of: outer layers (1-a) and (1-c) comprised of polyethylene, and a core layer (1-b) comprised of a copolymer (Ethylene Vinyl Acetate, commonly known as EVA.

BRIEF DESCRIPTION OF THE INVENTION

(4) The invention starts with a conventional umbrella structure (FIG. 2). However, instead of using fabric during the manufacturing stage to perform its traditional functionproviding shadethe cover consists of a transparent or translucent film (1).

(5) As depicted in FIG. 1, this film is stitched into sections, like conventional fabric for this type of sunshade.

(6) Given that the purpose of the invention is to provide the user protection against the harmful effects of the sunin the form of ultraviolet radiationwhile allowing that person to enjoy the sun and its warmth, it is necessary to replace traditional fabric with a material that had filtration features or features for the absorption of ultraviolet rays.

(7) There are many products and substances on the market capable of significantly reducing, either by filtration or absorption, the impact of ultraviolet rays. The solution is to use a film composed of three layers of polymers (FIG. 3). This film is obtained through a process of co-extruding that combines three layers of different polymers into a single film. The three layers must have a transparency of greater than ninety percent.

(8) The exterior layers of the film, (1-a) and (1-c), are polyethylene. This is responsible for preventing the viscosity of the film. The core layer (1-b) is a copolymer (Ethylene Vinyl Acetate), commonly known as EVA, and is responsible for the film's elasticity and absorption of infrared radiation. The ethyl vinyl acetate copolymer comprises 18% vinyl acetate, and allows less than one percent of ultraviolet rays to pass through the core layer. This copolymer is well known, and permits a wide variety of applications, being light and easily shaped (with memory effect).

(9) Added to all layers of the film are additives of the HALS type (Amines sterically blocked), which are used as stabilizers against UV radiation and its absorption, and benzophenone, one of the most widely used sunscreens. The greater or lesser amount of additives will determine the greater or lesser protection against ultraviolet radiation (the well known protective factors of sunscreens). This solution allows the possibility of usingand not just on the beachsun shade type devices with different degrees or types of protection, making it possible, for example, to choose a device with protection factor X or Y. However, the amines sterically blocked should have an ultraviolet protection rating of greater than eighty, according to the European standard ultraviolet index. The invention meets the requirements of the European UV Standard 801 protection.

(10) As a result of the application of the three layers in the film (1), the film would exhibit the following features, in summary: Transparency (or translucency), which allows the passage of sunlight and its warmth; Flexibility (which facilitates its sewing and placement on the structure of the sunshade); Protection against ultraviolet radiation, and this protection may be more or less intense. The film obtained by the three layers of polymers allows one to obtain a transparency of 90%. The EVA copolymer has 18% of vinyl acetate. In the invention, less than 1% UV rays go through the three layers of film.