DE8905496U1 - Air flap with sealing lip for air ducts - Google Patents

Description

Max rterth GmbH & Co. Hauskampstrasse 37 4330 MuelhvJim a.d. Ruhr

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Description

Until now, the production of the sealing lip has been hot
vulcanizing rubbers are used, such as EPDM and silicone. These hot-vulcanizing rubbers require high temperatures, and the vulcanization time is also temperature-dependent. However, the base body of the flap, which is made of thermoplastic material, cannot tolerate high temperatures. This causes deformation of the base body, which leads to higher reject rates. There is no intimate connection between the hot-vulcanizing rubber and the base body; this is achieved by the openings in the edges of the flap (made mechanically). The base body is made thermoplastically, the joint is made by vulcanization. These are production processes that are difficult to combine without changing machines and molds. Thermoplastics are heated and solidify, rubber is converted from a plastic to an elastic state by hot vulcanization.

What is new is the manufacture of the flap and the sealing lip using thermoplastic methods. The base body of the flap consists of filled polypropylene, the sealing edge of thermoplastic polyolefin elastomer (TPE). The advantage is an inseparable connection (chemically coupled) between the round body and the sealing profile.

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Max Werth GmbH & Co. Hauskampstrasse 37 4330 Muelheim ad Ruhr

There is no excessive thermal load on the base body, and therefore no deformation. Hs-iz temperatures and cycle ^times when overmolding with vulcanizing rubber are, for example, x

EPDM 170 - 190 degrees Celsius cycle time 90 see.

LSR 140 - 160 degrees Celsius cycle time 30 see.(fluessiq silicon)

With TPE, the tool is only heated to approx. 15-70 degrees, the curing time is approx . 30 seconds.

Further advantages &igr;

Base body and sealing lip can be in a rierkzeuy or
a combination tool on a machine with zwpi jprit
During hot vulcanization, the object must be placed from a cool mold into the hot mold of the rubber injection machine. This process can be omitted when overmolding with TPE.

Due to their temperature resistance (from -20°C to +120°C), TPEs are suitable for use in heating, ventilation and air conditioning ducts. Standard rubber compounds lose their properties when exposed to hot

Max Werth GmbH * Co. Hausknnipstrasse 37 4330 Muelheim a.d. iiuhr

air 11 tensile strength (IbO C.) between 40 and 100 percent of the original tensile strength, '->while the TPfS still retain about 80 percent of the original tensile strength. The processing 1 ^t'i'i ; No compression molding is required, as the compression moldings are available in a ^flexible form. TPEs have a much higher mechanical load-bearing capacity than silicones, which are known for their low mechanical load-bearing capacity, which results in a longer service life. The compression set resistance of TPEs is lower and relatively constant in comparison to other types of rubber, where it increases sharply over time.

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Claims (4)

Max rterth GmbH Ä Co. Hauskampstrasse 37 4330 Muelheim, 30.04.3V ·■*■■■«#· I. · · · · claim to protection Utility model protection is applied for 1 for« Air flap (shut-off, regulating flap) with ventilating lip for ducts in heating, ventilation and air conditioning systems, especially in motor vehicles. 1. The base body of the flap is made of filled polypropylene plastic (e.g. fiberglass, talcum). 2. The outer surface of the flap made of LnenropL^suMtiiKin ruiyOicwi uitSw·«= ■ &ngr; 11 t .. 3. The material of the base body and the optical lens is chemically coupled. 4. The sealing lip is made of elastic thermoplastic.