EP0123374A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
In-mold coating method
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1984-01-31
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Granted: —
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Expires: 2004-01-31
Abstract
Abstract An SMC (FRP) molding is coated with a minimum amount of an IMC composition by skewing one of the mold halves during the initial IMC molding cycle to effect a scissoring action, the fulcrum being at or aboutthe IMC injection point or placement to spread or wipe the IMC over the surface of the SMC part and then effecting at least substantial parallelism of the mold halves during the remaining IMC cycle of coating and curing the IMC.
Inventors
- 👤 Richard M. Griffith
- 👤 Henry Shanoski
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 21:19
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0025; B29C37/0028; B29C43/00; B29C43/02; B29C43/14; B29C43/146; B29K; B29K2105/00; B29K2105/06; B29K2105/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
The method which comprises, in a heated compression mold having two halves forming a cavity for molding, (1) placing a MC (molding compound) charge in the cavity of one of said mold halves, (2) forcing one of said halves against the other while providing essentially parallelism between the mold halves as the mold is closed to spread the MC throughout the mold, to mold the MC and substantially to cure the MC to form a molded FRP (glass fiber reinforced plastic) part, (3) slightly separating said mold halves and introducing an IMC (in-mld coating) composition at a given location onto the outer surface of the FRP part, (4) reclosing the mold halves while, in substantially the first or initial portion of said mold reclosing, skewing one of said mold halves relative to the other to effect a scissoring action between the mold halves with the fulcrum being essentially at about said IMC introduction location and where said IMC was injected in order or sweep or wipe said IMC composition across the surface of the MC part and, in the latter portion of said mold reclosing, effecting at least substantial parallelism between the mold halves to complete the coating of the MC with the IMC composition, and (5), in said finally closed mold, curing said IMC to said FRP.
Claim 2
Independent Claim
218 words
The method which comprises, in a heated compression mold having two halves forming a cavity for molding, (1) placing a MC (molding compound) charge in the cavity of one of said mold halves, (2) forcing one of said halves against the other while providing essentially parallelism between the mold halves as the mold is closed to spread the MC throughout the mold, to mold the MC and substantially to cure the MC to form a molded FRP (glass fiber reinforced plastic) part, (3) slightly separating said mold halves and introducing an IMC (in-mld coating) composition at a given location onto the outer surface of the FRP part, (4) reclosing the mold halves while, in substantially the first or initial portion of said mold reclosing, skewing one of said mold halves relative to the other to effect a scissoring action between the mold halves with the fulcrum being essentially at about said IMC introduction location and where said IMC was injected in order or sweep or wipe said IMC composition across the surface of the MC part and, in the latter portion of said mold reclosing, effecting at least substantial parallelism between the mold halves to complete the coating of the MC with the IMC composition, and (5), in said finally closed mold, curing said IMC to said FRP.
Claim 3
Dependent Claim
21 words
The method according to claim 1 wherein the MC charge is placed in the mold half near the IMC introduction location.
Claim 4
Dependent Claim
19 words
The method according to claim 1 or claim 2 wherein the IMC composition is injected through an injection port.
Claim 5
Independent Claim
18 words
The method according to any one of claims 1 to 3 wherein the MC is sheet molding compound.
References Cited (Backward Citations)
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