Forehead pad for a breathing mask and method for making the same

1. A forehead pad for a breathing mask, comprising:

a substantially dimensionally stable first wall element; and

an elastomer second wall element molded onto the first wall element, the second wall element having a contact zone adapted to contact a surface of a user when the breathing mask is worn,

wherein the first and second wall elements define a filling-material-receiving chamber adapted to receive a filling material, and

wherein the first wall element has an adhesion-bonding zone and a detachment zone, the adhesion-bonding zone has a first surface property which allows the second wall element to bond to the first wall element, and the detachment zone has a second surface property which disallows bonding between the second wall element and the first wall element such that the second wall element detaches from the detachment zone of the first wall element when the filling-material is received in the filling-material-receiving chamber.

2. The forehead pad in accordance with claim 1 , wherein the second wall element is formed by injection molding an elastomer material onto the first wall element.

3. The forehead pad in accordance with claim 1 , wherein the filling-material-receiving chamber is formed by detachment of the second wall element from the first wall element.

4. The forehead pad in accordance with claim 1 , wherein the filling-material-receiving chamber is filled with a gel material.

5. The forehead pad in accordance with claim 1 , wherein the first wall element and the second wall element are coupled to one another via the adhesion-bonding zone.

6. The forehead pad in accordance with claim 5 , wherein the adhesion-bonding zone is formed by corona or plasma treatment of defined and selected regions of the first wall element.

7. The forehead pad in accordance with claim 1 , wherein the forehead pad has a substantially circular outline.

8. The forehead pad in accordance with claim 1 , wherein the forehead pad has a polygonal or kidney-shaped outline.

9. The forehead pad in accordance with claim 1 , wherein the first wall element is made from a thermoplastic material.

10. The forehead pad in accordance with claim 1 , wherein the first wall element is part of a forehead support.

11. The forehead pad in accordance with claim 1 , wherein the first wall element is provided with a fastener to couple the first wall element to a forehead support.

12. A breathing mask including a forehead pad in accordance with claim 1 .

13. A breathing mask for administering a breathable gas, at a pressure level that at least in one phase is above ambient pressure, comprising:

a structure including a contact face adapted to contact a face surface portion on a user's face,

the structure being formed by an elastomer wall and a counterpart surface structure, the elastomer wall and the counterpart surface structure defining a filling-material-receiving chamber that extends therebetween, and the elastomer wall is initially constructed as a wall that is formed integrally onto the counterpart surface structure and subsequently at least partially detached from the counterpart surface structure,

wherein the counterpart surface has an adhesion-bonding zone and a detachment zone, the adhesion-bonding zone has a first surface property which allows the elastomer wall to bond to the counterpart surface, and the detachment zone has a second surface property which disallows bonding between the elastomer wall and the counterpart surface such that the elastomer wall detaches from the detachment zone of the counterpart surface when a filling-material is received in the filling-material-receiving chamber.

14. The breathing mask in accordance with claim 13 , wherein the structure forms a forehead pad.

15. The breathing mask in accordance with claim 13 , wherein the structure forms a component of a sealing lip device.

16. A method for forming a forehead pad, comprising:

providing a substantially dimensionally stable first wall element;

molding an elastomer second wall element onto the substantially dimensionally stable first wall element; and

introducing a filling material into a chamber defined between the first and second wall elements such that the second wall element detaches from the first wall element in a detachment zone of the first wall element that requires detachment but remains attached to the first wall element in a defined adhesion bonding zone of the first wall element,

wherein the adhesion-bonding zone has a first surface property which allows the second wall element to bond to the first wall element, the detachment zone has a second surface property which disallows bonding between the second wall element and the first wall element such that the second wall element detaches from the detachment zone of the first wall element when the filling-material is introduced into the filling-material-receiving chamber.

17. The method in accordance with claim 16 , wherein introducing a filling material into a chamber includes filling the chamber with a gel material.

18. The method in accordance with claim 16 , wherein the defined adhesion bonding zone is provided along an outer circumferential region of the first wall element.

19. The method in accordance with claim 16 , further comprising forming the adhesion bonding zone by corona or plasma treatment of defined and selected regions of the first wall element.

20. A method for forming a forehead pad, comprising:

forming a first mold chamber with first and second tool segments to mold a substantially dimensionally stable first wall element;

after the first wall element has hardened, removing the second tool segment from the first tool segment to expose a portion of the first wall element;

treating the exposed portion of the first wall element to create an adhesion-bonding zone;

forming a second mold chamber with the first tool segment and a third tool segment to mold an elastomer second wall element onto the substantially dimensionally stable first wall element;

after the second wall element has hardened, removing the third tool segment from the first tool segment to expose the second wall element; and

introducing a filling material into a chamber defined between the first and second wall elements such that the second wall element detaches from the first wall element in a detachment zone of the first wall element that requires detachment but remains attached to the first wall element in the adhesion bonding zone of the first wall element,

wherein the adhesion-bonding zone has a first surface property which allows the second wall element to bond to the first wall element, the detachment zone has a second surface property which disallows bonding between the second wall element and the first wall element such that the second wall element detaches from the detachment zone of the first wall element when the filling-material is introduced into the filling-material-receiving chamber.

21. The method in accordance with claim 20 , wherein the forming, removing, treating, and introducing steps are automated.