Flexible seal with rodent resistant barrier
An elastic oblong seal has a sealing section with a flexible outer body and a rodent resistant barrier therein. The barrier includes separate metal wires arranged at a distance to each other and extending substantially in parallel to a seal longitudinal direction. The outer body includes a TPE constituting the basic material and form of the seal. The metal wires include at least three separate metal wires each of solid single stranded metal. At least two of the at least three are encompassed by a TPE which is at least one chemically modified PP, selected from the group consisting of: a PP grafted with carboxylic acid, PP grafted with anhydride groups, a PP grafted with epoxides, a PP grafted with silanes, a MAPP, a PP grafted with methacrylic acid, a PP grafted with glycidyl methacrylate, a PP grafted with vinyl trimethoxysilane, and a PP grafted with methacryl trimethoxysilane.
1. An elastic and oblong seal comprising:
a sealing section comprising:
a flexible outer body; and
a rodent resistant barrier embedded in said outer body, said barrier comprising a plurality of separate metal wires arranged at a distance to each other and extending substantially in parallel to a longitudinal direction of the seal;
wherein:
the flexible outer body comprises a thermoplastic elastomer (TPE) that constitutes the basic material of the seal and defines a form of the seal; and
the plurality of separate metal wires comprises at least three separate metal wires each of solid single stranded metal,
wherein at least two of the at least three separate metal wires of solid single stranded metal are encompassed by a different thermoplastic elastomer (different TPE) comprising at least one chemically modified polypropylene (PP), selected from the group consisting of: a polypropylene (PP) grafted with carboxylic acid, a polypropylene (PP) grafted with anhydride groups, a polypropylene (PP) grafted with epoxides, a polypropylene (PP) grafted with silanes, a maleic anhydride grafted polypropylene (MAPP), a polypropylene (PP) grafted with methacrylic acid, a polypropylene (PP) grafted with glycidyl methacrylate, a polypropylene (PP) grafted with vinyl trimethoxysilane, and a polypropylene (PP) grafted with methacryl trimethoxysilane.
2. The seal according to claim 1 , wherein the seal is configured for rodent proofing buildings.
3. The seal according to claim 1 , wherein the at least one chemically modified polypropylene (PP) is a modified polypropylene (PP) selected from the group consisting of: the maleic anhydride grafted polypropylene (MAPP), the polypropylene (PP) grafted with methacrylic acid, the polypropylene (PP) grafted with glycidyl methacrylate, the polypropylene (PP) grafted with vinyl trimethoxysilane, and the polypropylene (PP) grafted with methacryl trimethoxysilane.
4. The seal according to claim 1 , wherein the at least one chemically modified polypropylene (PP) is the maleic anhydride grafted polypropylene (MAPP).
5. The seal according to claim 1 , wherein the at least one chemically modified polypropylene (PP) occurs in a polypropylene (PP) matrix of a thermoplastic vulcanizate with particles of cured rubber encapsulated in a matrix of polypropylene (TPV).
6. The seal according to claim 1 , wherein a thickness of the different thermoplastic elastomer (TPE) comprising at least one chemically modified polypropylene (PP) and substantially encompassing the at least two separate metal wires is at least 0.05 mm.
7. The seal according to claim 1 , wherein the at least two separate metal wires are straight metal wires.
8. The seal according to claim 1 , wherein the at least two separate metal wires are steel wires.
9. The seal according to claim 1 , wherein at least one of the at least two separate metal wires has an extraction resistance of at least 197 newton.
10. A method of producing in a single co-extrusion process a seal according to claim 1 , wherein the plurality of substantially parallel metal wires are separate metal wires as well as straight metal wires, said method comprising the steps of:
feeding the plurality of substantially parallel metal wires into an extrusion die;
further comprising further double extrusion steps:
by means of a first extruder coating the at least two separate metal wires with the different thermoplastic elastomer (TPE) comprising the at least one chemically modified polypropylene (PP) selected from the group consisting of: the polypropylene (PP) grafted with carboxylic acid, the polypropylene (PP) grafted with anhydride groups, the polypropylene (PP) grafted with epoxides, the polypropylene (PP) grafted with silanes, the maleic anhydride grafted polypropylene (MAPP), the polypropylene (PP) grafted with methacrylic acid, the polypropylene (PP) grafted with glycidyl methacrylate, the polypropylene (PP) grafted with vinyl trimethoxysilane, and the polypropylene (PP) grafted with methacryl trimethoxysilane; and by means of a second extruder embedding the coated metal wires in the second thermoplastic elastomer (TPE).
11. The method according to claim 10 , wherein the at least two separate metal wires are coated with at least 0.05 mm of the different thermoplastic elastomer (TPE) comprising the at least one chemically modified polypropylene (PP).
12. The method according to claim 10 , wherein the thermoplastic elastomer (TPE) is a thermoplastic elastomer (TPE) in a form of a thermoplastic vulcanizate with particles of cured rubber encapsulated in a matrix of polypropylene (TPV) that does not comprise any chemically modified polypropylene (PP).
13. The method according to claim 10 , wherein: the thermoplastic elastomer (TPE) is the maleic anhydride grafted polypropylene (MAPP); and the maleic anhydride grafted polypropylene (MAPP) occurs in a polypropylene (PP) matrix of a thermoplastic vulcanizate with particles of cured rubber encapsulated in a matrix of polypropylene (TPV).
14. The seal according to claim 1 , wherein:
the at least two of the at least three separate metal wires are only coated with the at least one chemically modified PP, and
the TPE that constitutes the basic material of the seal and defines the form of the seal is made of a different TPE from the different TPE coated on the at least two of the at least three separate metal wires.