Process for micro-texturing a mold

• US 6,361,703 B1
• Filed: 03/04/1999
• Issued: 03/26/2002
• Est. Priority Date: 03/04/1999
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Dickey, Alan M.
• Primary Examiner(s): Gulakowski, Randy
• Assistant Examiner(s): SMETANA, JIRI F
• Application Number:
  US09/262,233
• Time in Patent Office: 1,118 Days
• Field of Search: 216/41, 216/8, 216/9, 216/10, 216/83, 430/201, 430/302, 156/656, 156/659.1, 156/664, 277/345, 277/418, 277/590, 277/641, 277/643, 295/271
• US Class Current: 216/9
• CPC Class Codes: B29C 33/424 Moulding surfaces provided with means for marking or patterning for injection moulding B29C45/372
• CPC Class Codes: B29C 39/02 for making articles of definite length, i.e. discrete articles
• CPC Class Codes: B29L 2031/26 Sealing devices, e.g. packaging for pistons or pipe joints

Abstract

The present invention relates to a method for producing a mold having a micro-textured surface, wherein the mold can be used to form an elastomeric seal having a micro-textured surface. The resulting seal will hold an amount of lubricant that is released with time, the release of the lubricant will result in decreased friction between the seal and a surface contacted by the seal.

Claims

1. A method for micro-texturing a mold comprising the steps of:

(a) creating an image of a desired micro-texture surface of a mold;

(b) photographically reproducing the image of the micro-texture surface of the mold to form a negative;

(c) developing the negative of the image of the surface of the mold over a photosensitive plate to establish exposed and unexposed areas of the photosensitive plate;

(d) creating a protective mask of the exposed areas of the photosensitive plate;

(e) transferring the protective mask of the exposed areas of the photosensitive plate to a surface of the mold, the protective mask determining a portion of the mold surface not to be modified; and

(f) exposing the mold surface to an acid so as to acid etch the mold surface not covered by the protective mask and impart the micro-texture to the mold surface.

2. The method of claim 1 wherein the step of creating a protective mask of the exposed areas of the photosensitive plate further comprises applying an amount of wax to the photosensitive plate, the wax adhering to the exposed areas of the photosensitive plate.

3. The method of claim 2 wherein the step of transferring the protective mask of the exposed areas of the photosensitive plate to a surface of the mold further comprises transferring the wax on the photosensitive plate to transfer paper and then contacting the transfer paper on the surface of the mold so that the wax is placed on the surface of the mold.

4. The method of claim 1 wherein the image of the desired micro-texture surface is created from a computer generated image or from a photograph of an actual surface.

5. The method of claim 1 wherein the acid etches the surface of the mold to a depth ranging between less than 1micron and about 500 microns to form the micro-texture to the mold surface.

6. The method of claim 5 wherein the acid etches the surface of the mold to a depth ranging between about 10 microns and about 50 microns.

7. The method of claim 1 wherein the mold surface is steel.

8. The method of claim 1 wherein the mold is a mold for forming elastomeric seals.

9. A method for producing a seal having a micro-textured pattern on a surface of the seal, wherein the method is comprised of:

(a) creating an image of a desired micro-texture pattern;

(b) photographically reproducing the image of the micro-texture pattern;

(c) creating a protective mask from the image of the micro-texture pattern;

(d) transferring the protective mask to a mold;

(e) exposing the mold to an amount of acid so as to acid etch the mold thereby imparting the micro-texture pattern to the mold; and

(f) forming an elastomeric seal from the mold by pouring a liquefied elastomeric material into the mold and allowing the elastomeric material to cure into the seal having the micro-textured pattern.

10. A method for micro-texturing a mold, with the mold used to produce a member having a micro-textured surface so that the member retains an amount of lubricant and reduces friction resulting from the member movably contacting a surface of another object while preventing leakage of liquids, wherein said method is comprised of:

(a) creating an image of a desired micro-texture surface;

(b) photographically reproducing the image of the micro-texture surface to form a negative;

(c) using the negative to transfer a pattern of the micro-texture image to a mold, with the pattern determining which portion of the mold will be removed by acid, wherein the negative is developed over a photosensitive plate so that exposed and unexposed areas from the negative are transferred onto the plate resulting in the plate having the exposed and unexposed areas and an amount of wax is applied to the photosensitive plate, the wax adhering to the exposed areas of the plate; and

,

(d) exposing the mold to an amount of acid so as to acid etch the mold'"'"'s surface and impart the micro-texture pattern to the surface of the mold to form a mold with a micro-texture surface.

11. A method for micro-texturing a mold, with the mold used to produce a member having a micro-textured surface so that the member retains an amount of lubricant and reduces friction resulting from the member movably contacting a surface of another object while preventing leakage of liquids, wherein said method is comprised of:

(a) creating an image of a desired micro-texture surface;

(b) photographically reproducing the image of the micro-texture surface to form a negative;

(c) using the negative to transfer a pattern of the micro-texture image to a mold, with the pattern determining which portion of the mold will be removed by acid, wherein the negative is developed over a photosensitive plate so that exposed and unexposed areas from the negative are transferred onto the plate resulting in the plate having the exposed and unexposed areas and an amount of wax is applied to the photosensitive plate, the wax adhering to the exposed areas of the plate, and contacting the wax on the photosensitive plate with transfer paper and then contacting the mold with the transfer paper having an amount of wax adhered thereto so that the wax is placed on the surface of the mold, and the acid will then etch that portion of the mold not covered by the wax; and

,

(d) exposing the mold to an amount of acid so as to acid etch the mold'"'"'s surface and impart the micro-texture pattern to the surface of the mold to form a mold with a micro-texture surface.