US4777002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing molds for injection molding
Assignee: Individual
•
Filing: 1986-09-30
•
Granted: 1988-10-11
•
Expires: 2006-09-30
Abstract
Abstract Molds for injection molding are produced by providing a primary mold core, coating the primary mold core with a water-resistant coating layer, applying on the water-resistant coating layer a separating layer, spraying a metal shell on the separating layer, arranging a rear filling on the shell so as to form a tool part, and supplying water to the water-soluble layer so as to remove the tool part.
Inventors
- 👤 Alban Putz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/38; B29C33/56; B29C33/565; B29C33/60; B29C45/00; B29C45/17; B29C45/26; B29C45/37
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
116 words
A method of producing molds for injection molding, particularly for tools for injection molding of synthetic plastics, the method comprising the steps of providing a primary mold core; spraying on a layer which forms a mold shell; arranging a rear filling so that the mold shell and the rear filling together form a mold part; providing before spraying, between the mold core and the mold shell-forming layer, two separate layers by coating the primary mold core with a heat-resistant and water-resistant coating layer and subsequently applying on the coating layer a heat-resistant and water-soluble separating layer; and supplying water to the water-soluble separating layer so as to release the mold part from the primary mold core.
Claim 2
Independent Claim
116 words
A method of producing molds for injection molding, particularly for tools for injection molding of synthetic plastics, the method comprising the steps of providing a primary mold core; spraying on a layer which forms a mold shell; arranging a rear filling so that the mold shell and the rear filling together form a mold part; providing before spraying, between the mold core and the mold shell-forming layer, two separate layers by coating the primary mold core with a heat-resistant and water-resistant coating layer and subsequently applying on the coating layer a heat-resistant and water-soluble separating layer; and supplying water to the water-soluble separating layer so as to release the mold part from the primary mold core.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1, wherein said providing step includes providing the primary mold core of a fine steel.
Claim 4
Dependent Claim
20 words
A method as defined in claim 1, wherein said providing step includes providing the primary mold core of a metal.
Claim 5
Dependent Claim
20 words
A method as defined in claim 1, wherein said providing step includes providing the primary mold core of a ceramic.
Claim 6
Dependent Claim
33 words
A method as defined in claim 1, wherein said coating step includes coating of the primary mold core with a water solution of hydrosols, latexes, acrylic resin, finely ground quartz and alkyde lacquer.
Claim 7
Dependent Claim
25 words
A method as defined in claim 1, wherein said applying step includes applying a water solution of adhesive, carbohydrate, finely ground quartz and metal powder.
Claim 8
Dependent Claim
24 words
A method as defined in claim 1, wherein said applying step includes applying said water-soluble separating layer after drying of said water-insoluble coating layer.
Claim 9
Dependent Claim
58 words
A method as defined in claim 1, wherein said coating step includes coating of the primary mold core with a water-resistant coating layer solution having the following composition: ______________________________________
latex 38% by weight
water 25% by weight
finely ground quartz
25% by weight
acrylic resin 8% by weight
hydrosol 3% by weight
alkyde lacquer 1% by weight.
______________________________________
Claim 10
Dependent Claim
51 words
A method as defined in claim 1, wherein said applying step includes applying a water-soluble separating layer solution having the following composition: ______________________________________
softened water 38% by weight
finely ground quartz
36% by weight
sugar/dissolved in water
15% by weight
adhesive 8% by weight
metal powder (nickel)
3% by weight.
______________________________________
Claim 11
Dependent Claim
20 words
A method as defined in claim 1, wherein said arranging step includes arranging the rear filling composed of quartz sand.
Claim 12
Dependent Claim
20 words
A method as defined in claim 1, wherein said arranging step includes arranging the rear filling composed of metal powder.
Claim 13
Dependent Claim
20 words
A method as defined in claim 1, wherein said arranging step includes arranging the rear filling composed of epoxy resin.
Claim 14
Dependent Claim
21 words
A method as defined in claim 1, wherein said arranging step includes arranging the rear filling composed of a cast metal.
Claim 15
Dependent Claim
37 words
A method as defined in claim 1; and further comprising the step of pressing a housing surrounding the primary mold core and the mold shell, said arranging step including filling of the rear filling into the housing.
Claim 16
Dependent Claim
34 words
A method as defined in claim 14; and further comprising the step of using a cover having a conical shell-shaped edge which engages the housing at all sides and abuts against the rear filling.
Claim 17
Dependent Claim
27 words
A method as defined in claim 1, and further comprising the step of applying a copper layer on the mold shell arranged on the primary mold core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |