1. A molding element for a tire mold manufactured from a metallic powder fused together layer by layer, the molding element comprising:
a first surface adapted to mold all or part of a tread surface of the tire,
a second surface opposite to the first surface and adapted to be in contact with another part of the mold,
wherein the thickness (E) of the molding element between 1 and 6 millimetres, the molding element overall having a density greater than or equal to 98%, and
at least one first porous area extending into the thickness of this molding element, this first porous area comprising a plurality of pores allowing air to pass between the first surface of the molding element and the second surface thereof.
2. The molding element according to claim 1, wherein the first porous area forms a marking on the molding element, this marking being adapted to mold a pattern on the tire.
3. The molding element according to claim 1, further comprising:
a lateral surface connecting the first surface to the second surface, and
a second area extending from the first porous area of the molding element to the lateral surface, wherein the second porous area forming all or part of the second surface of the molding element.
4. The molding element according to claim 1, further comprising a plurality of protrusions projecting from the first surface and adapted to mold cuts in the tread of the tire, wherein at least two protrusions of the plurality of protrusions intersect on this first surface, wherein the first porous area opens onto the first surface at the intersection of the two protrusions.
5. A method for the layer-by-layer manufacture of a molding element for a tire mold, the molding element comprising a first surface adapted to mold all or part of a tread surface of the tire and a second surface opposite to the first surface and adapted to be in contact with another part of the mold, the thickness of the molding element being between 1 and 6 millimetres, the molding element overall having a density greater than or equal to 98%, the method of manufacture comprising a plurality of steps of applying layers of metallic particles and of agglomerating all or some of the particles of these layers by fusion, wherein for each of the layers of the molding element, a porous part is created during the step of agglomerating the particles, the porous parts of the various layers of the molding element being superposed with one another to form a continuous porous area extending into the thickness of the molding element.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An oxygen-absorbing composition comprising in relatively sufficient proportions particulate annealed electrolytically reduced iron, salt for combining with water to produce an electrolyte which combines with said iron to cause it to absorb oxygen, and a water-supplying component comprising activated carbon with liquid water therein for supplying said water to said salt to produce said electrolyte.
2. An oxygen-absorbing composition as set forth in claim 1 wherein said water-supplying component is present by weight in an amount of up to about 85% of the total weight of the composition.
3. An oxygen-absorbing composition as set forth in claim 2 wherein said water-supplying component contains by weight up to about 40% of water.
4. An oxygen-absorbing composition as set forth in claim 2 wherein said water-supplying component is present in an amount by weight of between about 59% and 78% of the total weight of the composition.
5. An oxygen-absorbing composition as set forth in claim 4 wherein said water-supplying component contains by weight between about 20% and 38% of water.
6. An oxygen-absorbing composition as set forth in claim 1 wherein said particulate annealed electrolytically reduced iron is present by weight in an amount between about 63% and 15% of the total weight of the composition, and wherein said water-supplying component is present in an amount of between about 37% and 85% of the total weight of the composition.
7. An oxygen-absorbing composition as set forth in claim 6 wherein said water-supplying component contains by weight between about 10% and 40% of water.
8. An oxygen-absorbing composition as set forth in claim 6 wherein said water-supplying component contains by weight between about 20% and 38% of water.
9. An oxygen-absorbing composition as set forth in claim 1 wherein said annealed electrolytically reduced iron is present by weight in an amount of up to about 63% of the total weight of the composition, and wherein said water-supplying component is present by weight in an amount of at least about 37% of the total weight of the composition.
10. An oxygen-absorbing composition as set forth in claim 9 wherein said water-containing component contains by weight between about 20% and 38% of water.
11. An oxygen-absorbing composition as set forth in claim 10 wherein said iron is of a size of between about 100 and 325 mesh, and wherein said water-supplying component is of a size of between about 4 mesh and 200 mesh.
12. An oxygen-absorbing composition as set forth in claim 1 wherein said particulate annealed electrolytically reduced iron is of a size of between about 100 mesh and 325 mesh.
13. A packet of an oxygen-absorbing composition comprising in relatively sufficient proportions particulate annealed electrolytically reduced iron, salt for combining with water to produce an electrolyte which combines with said iron to cause it to absorb oxygen, a water-supplying component comprising activated carbon with liquid water therein for supplying said water to said salt to produce said electrolyte, and an envelope for said composition comprising a laminate of ethylene vinyl acetate, water and grease resistant paper, and microperforated polyester film.
14. A packet of an oxygen-absorbing composition as set forth in claim 13 wherein said ethylene vinyl acetate has about 250,000 holes per square meter, and wherein said microperforated polyester film has about 13,888 holes per square meter.