Microstructure arrangement for gripping low coefficient of friction materials
A microstructure arrangement for gripping low coefficient material comprising: a substrate disposed on a gripping surface; a set of pillars disposed on the substrate; and, wherein the set of pillars have the physical property of a grip force in excess of 50.0N with a contact area of 25% or less as determined by the friction testing method. A first set of pillars can be disposed on the substrate having a cross section area in the range of 100 μm 2 to 160,000 μm 2 , height relative to the substrate in the range of 10 μm to 400 μm, and a pitch determined from the center of the pillars, in the range of 20 μm to 1000 μm; and a secondary set of pillars disposed on the first set of pillars having a cross section area less than that of the pillars in the first set of pillars.
1. A microstructure arrangement for gripping low coefficient material comprising:
a substrate disposed on a gripping surface wherein the substrate has a coefficient of friction relative to a polymer against steel of 0.2 or less;
a first set of pillars disposed on the substrate having a cross section area in the range of 100 μm 2 to 160,000 μm 2 , height relative to the substrate in the range of 10 μm to 400 μm, and a pitch determined from the center of the pillars, in the range of 20 μm to 1000 μm;
a secondary set of pillars disposed on the first set of pillars having a cross section area less than that of the pillars in the first set of pillars;
wherein the first set of pillars and the second set of pillars are configured to cooperate to have the physical property of a grip force in excess of 50.0N with a contact area of 25% or less, as determined by the friction testing method; and, wherein the substrate is PTFE,
wherein the first set of pillars and the second set of pillars are configured to cooperate to have a coefficient of friction in the range of 0.7 to 0.9.
2. The microstructure arrangement of claim 1 wherein the grip force is in excess of 55.0N with a contact area of 20% or less.
3. The microstructure arrangement of claim 1 wherein the grip force in excess of 60.0N with a contact area of 10% or less.
4. The microstructure arrangement of claim 1 wherein the first set of pillars and the second set of pillars are configured to cooperate to have a coefficient of friction greater than 3.4 times smooth PTFE.
5. The microstructure arrangement of claim 1 wherein the first set of pillars is arranged in a rectangular lattice.
6. The microstructure arrangement of claim 1 wherein the second set of pillars can be disposed on the top of each of the pillars of the first set of pillars and varies from pillar to pillar.
7. A microstructure arrangement for gripping low coefficient material comprising:
a substrate disposed on a gripping surface wherein the substrate has a coefficient of friction relative to a polymer against steel of 0.2 or less;
a first set of pillars disposed on the substrate having a cross section area in the range of 100 μm 2 to 160,000 μm 2 , height relative to the substrate in the range of 10 μm to 400 μm, and a pitch determined from the center of the pillars, in the range of 20 μm to 1000 μm;
a secondary set of pillars disposed on the first set of pillars having a cross section area less than that of the pillars in the first set of pillars;
wherein the first set of pillars and the second set of pillars are configured to cooperate to have the physical property of a grip force in excess of 50.0N with a contact area of 25% or less, as determined by the friction testing method; and, wherein the substrate is SBR,
wherein the first set of pillars and the second set of pillars are configured to cooperate to have a coefficient of friction in the range of 1.0 to 1.4.
8. The microstructure arrangement of claim 7 wherein the first set of pillars and the second set of pillars are configured to cooperate to have a coefficient of friction greater than 1.1 times smooth SBR.
9. A microstructure arrangement for gripping low coefficient material comprising:
a substrate disposed on a gripping surface wherein the substrate has a coefficient of friction relative to a polymer against steel of 0.2 or less;
a first set of pillars disposed on the substrate having a cross section area in the range of 100 μm 2 to 160,000 μm 2 , height relative to the substrate in the range of 10 μm to 400 μm, and a pitch determined from the center of the pillars, in the range of 20 μm to 1000 μm;
a secondary set of pillars disposed on the first set of pillars having a cross section area less than that of the pillars in the first set of pillars;
wherein the first set of pillars and the second set of pillars are configured to cooperate to have the physical property of a grip force in excess of 50.0N with a contact area of 25% or less, as determined by the friction testing method; and, wherein the substrate is nylon,
wherein the first set of pillars and the second set of pillars are configured to cooperate to have a coefficient of friction in the range of 0.8 to 1.0.
10. A microstructure arrangement for gripping low coefficient material comprising:
a substrate disposed on a gripping surface wherein the substrate has a coefficient of friction relative to a polymer against steel of 0.2 or less;
a set of pillars disposed on the substrate having a cross section area in the range of 10 μm 2 to 400 μm 2 , height relative to the substrate in the range of 10 μm to 400 μm, a pitch determined from the center of the pillars in the range of 20 μm to 1000 μm, and a coefficient of friction in the range of 0.7 to 0.9 wherein the substrate is PTFE; and,
wherein the set of pillars are configured to cooperate to have the physical property of a grip force in excess of 50.0N with a contact area of 25% or less as determined by the friction testing method.
11. The microstructure arrangement of claim 10 wherein the grip force is in excess of 60.0N with a contact area of 10% or less.
12. The microstructure arrangement of claim 10 including a secondary pattern disposed on the top of the set of pillars.