DD158047A1 - SUNSHADE ELEMENT FOR THE MANUFACTURE OF JALOUSIA - Google Patents

Abstract

The invention relates to a sun protection element for the production of blinds, the maintenance-free and easy care and is functional in all weather conditions and is used for the regulation of Lichtein- or -austritt in residential and community buildings. The object is to develop a sun protection element for the production of blinds, which has a good thermo-mechanical behavior and remains independent of the acting heat energy type functional. As a solution, a sun protection element is proposed, which consists of a solid composite of differing in their characteristics characteristics layers of one or more plastic materials, wherein the light-facing layer an equal to larger surface, a same large to larger elasticity module and a larger linear expansion coefficient has the layer facing away from the light and the thickness ratio of the layer facing the light to the layer facing away from the light is 1: 1 to 4: 1, preferably 2: 1.

Description

229753 O

VEB CHETiIEKOLIBIITAT BITTSRi ¹ BLD Bitterfeld, 27. 4. 19.81

2108

Sunshade element for the production of blinds

Field of application of the invention;

The invention relates to a sun protection element for the production of blinds made of plastic materials, which is functional in all weather conditions, maintenance-free and easy to clean and for the regulation of Lichtein- or -austritt in residential and Gesellschafts- "buildings is used.

Characteristic of the known technical solutions

It is known that in order to reduce or avoid incoming sunlight in rooms blinds are used on Penstern. In addition, the use of blinds an uncontrollable, unpleasant influence on the indoor climate is to be prevented.

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For the production of sun protection elements is used as a material predominantly wood, but must be protected from the weather by a complex, constantly repeating care and maintenance. Another disadvantage with the use of wood results from its tendency to water absorption and the associated swelling phenomena, which adversely affect the operation of the blinds. It is furthermore known that metallic materials, in particular light metals, are used for the manufacture of blinds. However, these materials are cost-prohibitive and their suitability for puncturing is limited, since they have corrosion damage after a few years despite protective coating.

It is also known to produce sun protection elements made of plastic materials. Although they are easy to maintain and maintain, they have poor thermomechanical behavior. Their rigidity decreases with increasing temperature. It has been found that plastic blinds are deformed by their own weight during prolonged exposure to heat and thus become inoperative. In DE-OS 2,709,207 a blind is described which consists of a combination of plastic foam and metal. It can become dependent on the recorded. Heat quantity to open and close automatically. However, the blind profiles have insufficient thermomechanical behavior when exposed to heat energy. Furthermore, a Punktionstüchtigkeit is not given, Aveum be! Sun irradiation an insufficient heat energy supply takes place.

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Object of the invention

The aim of the invention is to provide an easy-care and maintenance-free sun protection element for die.Herstellung of blinds, which has a high Punktionstüchtigkeit in all weather conditions and can be manufactured inexpensively with low technological complexity v / s ·

Explanation of the essence of the invention

The invention has for its object to provide a sun protection element for the production of blinds "known materials, which is maintenance-free and easy to maintain, has a good thermo-mechanical behavior and remains functional regardless of the acting heat energy form · t According to the invention the object is achieved in that the sun protection element consists of a solid composite of layers differing in their properties from one or more plastic materials, the layer facing the light having an equal to greater surface area, an equal to greater modulus of elasticity and a larger linear thermal expansion coefficient than the layer facing away from the light and the thickness ratio of the layer facing the light to the layer facing away from the light is 1: 1 to 4: 5, preferably 2: 1. The sunscreen element may have a different shape For example, have a straight, curved or angled profile shape.

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As plastic materials, it is possible to use those materials which can form a solid composite. They should differ substantially in their linear expansion coefficient and preferably have different moduli of elasticity.

Suitable plastic materials are z. B. homopolymers and copolymers of vinyl chloride, polyurethanes, polyolefins, polymethacrylates, polyacrylates and polystyrene, love eggs use of different plastic materials consist in a particular embodiment, the sunscreen element forming layers only from a plastic material, by different formulation and / or structure and / or Processing has different properties characteristics · The structure and the plastic material composition of the sunscreen element according to the invention ensure excellent puncture stability in all weather conditions, since the sunscreen element stiffened by the action of heat energy itself. The heat energy can be supplied in the form of radiation and / or convection. This self-stabilizing effect surprisingly allows the use of plastic materials, which were previously unsuitable for use as a venetian blind because of their disadvantageous characteristics. The inventive solution eliminates the known disadvantageous properties of blinds made of plastic materials. The preparation of the sunscreen element according to the invention can be carried out by known methods, for example by extrusion, calendering with subsequent shaping, laminating, gluing or sintering. Another advantage of the invention is that the new sun protection element requires no care and maintenance over a long period of time. In addition, the new sun protection element can be manufactured inexpensively with little technological effort.

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Embodiment ·

The invention will be explained in more detail in the following exemplary embodiments,

Example 1 ·

Figure 1 shows the profile of a sun protection element in section. This sun protection element is in its original shape of a curved shape. The layer marked 1 is facing the sunlight and has a larger surface area than the layer 2 facing away from the light.

The layer 1 has a thickness of 2.8 mm and is made of PVC-hard with a modulus of elasticity of 3200 ΜϊΤ / m and a linear thermal expansion coefficient of 0.8 · 10 * "4 κ"" ^1. The layer 2 is sunlight It has a thickness of 1.25 mm and consists of a cellular PVC hard material with a modulus of elasticity

of 1100 MN / m and a coefficient of linear thermal expansion of 0.5 × 10 -5 K- ¹ . Figure 2 shows the schematic representation of the change that undergoes the sunscreen element when exposed to energy in the form of heat. The state indicated by 3 should be referred to as the normal or the initial state. The Ziistaiid denoted by 4 results after exposure to heat energy. Due to the different properties of the two plastic materials 1 and 2, it comes under the action of heat energy to a change in the resistance. moment. As a result, the rigidity of the sun protection element is increased and thus counteracted the insufficient thermo-mechanical behavior of plastic materials.

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Example 2. ,

Figure 3 shows the profile of a sun protection element in section.

This sun protection element is in its original form of a straight shape ·

The layer denoted by 5 is facing the sunlight and has the same surface area as the layer 6 applied to the light. The layer 5 has a thickness of 2.9 mm and consists of a polymethyl methacrylate having a Young's modulus of

3000 ΜΓΤ / m and a linear thermal expansion coefficient of 0.9 - 10 "" 4 K " ^1. The layer 6 bonded to the layer 6 is exposed to sunlight and consists of a cellular PVC material having a Young's modulus

of 1000 lah / m and a coefficient of linear thermal expansion of 0.4 × 10 -5 K ^-1, its thickness being 1.5 mm Figure 4 shows, analogously to Figure 2, the schematic representation of the change which the sun protection element has under the action of thermal energy experiences. The state denoted by 7 represents the original shape. The state denoted by 8 results after exposure to heat energy. The effect occurring here corresponds to that described in Example 1.

Claims (4)

229753 O. -7-. ^ 3 / DJ U 2108 Invention claim 1 · sun protection element for the production of Venetian blinds, characterized in that the sunshade element consists of a solid composite of layers differing in their properties from one or more plastic materials, the layer facing the light having an equal to greater surface area, an equal to an upper surface
larger modulus of elasticity and a larger one
linear thermal expansion coefficient than the layer facing away from the light and the thickness ratio of the light-facing layer to
the layer facing away from the light is 1: 1 to 4: 1, preferably 2: 1, 2 · Sun protection element according to point 1, marked
in that the plastic materials used homo- and copolymers of vinyl chloride, polyurethanes, polyolefins, polymethacrylates, polyacrylates or
Are polystyrene. , 229753 O- ²¹⁰⁸ 3 · sun protection element according to item 1, characterized in that the production by extrusion, calendering with subsequent shaping,
Laminating, gluing or sintering takes place · 4. sun protection element according to item 1, characterized in that 'its shape is straight, curved and angled.