# US 10,307,938 B2 · Chemical resistant composite support pad mold and method of manufacturing the support pad

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- Number: US 10,307,938 B2
- Document ID: US10307938B2
- Status: Granted
- Kind: B2
- Application number: 15/288,047
- Filed: 2016-10-07
- Published: 2017-05-18
- Granted: 2019-06-04
- Earliest claimed: 2015-11-17
- Applicants: Great Plains Coatings, Inc.
- Inventors: Paul Kirby Reber
- Web page: https://patentgrep.com/patent/US10307938B2

## CPC

- B29C 33/46: using fluid pressure
- B29C 37/0032: {the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat (B29C44/14 and B29C44/32 take precedence)}
- B29C 44/08: using several expanding {or moulding} steps
- B29C 44/581: {Closure devices for pour holes}
- B29C 44/58: Moulds
- B29C 2037/0035: {the coating being applied as liquid, gel, paste or the like}
- B29K 2075/00: Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material
- B29K 2105/04: cellular or porous
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

Embodiments of the mold for making the Chemical Resistant Composite Support Pad are comprised of a top and bottom molds where the top mold is comprised of a mold lip, a pneumatic ejection port, a lid aperture, a magnetic cover for the pneumatic ejection port, and a lid. The method of making a chemical resistant composite support pad comprises the steps of spraying a coating of polymer agent into the top mold and the bottom mold. A controlled run of an agent is sprayed into the joined top and bottom molds along the joint of the top mold and the bottom mold. Polymeric foam is injected through the lid aperture, the lid is replaced, and the foam is allowed to cure. The molds are separated, and compressed air is used to eject the support pad out of the mold. Any irregularities are repaired by spraying the coating of polymer agent.

## Claims

### Claim 1

A method of making a chemical resistant composite support pad comprising the steps
a) a top mold and a bottom mold are opened so that the interior sides of both molds are accessible; wherein the top mold comprises a pneumatic ejection port, a magnetic cover for the pneumatic ejection port, a lid aperture, and a lid covering the lid aperture;
b) a coating of a polymer agent is sprayed onto the interior sides of the top mold to form a top mold coating and the bottom mold to form a bottom mold coating and then the top and bottom coatings are allowed to cure;
c) the top mold and a bottom molds are placed together, and the lid located on the top of the top mold is removed along with a portion of the coating;
d) the polymer agent used in the top mold coating and the bottom mold coating is sprayed into the interior of the closed coated molds via the lid aperture to completely seal any remaining exposed joints at the intersection of the top mold coating and the bottom mold coating and the polymer agent is allowed to cure;
e) polymeric foam is injected through the lid aperture;
f) the lid is placed over the lid aperture;
g) the foam is allowed to rise, harden, and cure;
h) the top mold and the bottom mold are separated;
i) compressed air is forced into the pneumatic ejection port forcing the magnetic cover and the support pad out of the top mold;
and
j) irregularities in the areas covered by the lid or the magnetic cover are repaired by spraying another coating of the polymer agent.