# US 2019/0168432 A1 · Method and device for heating a mould

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- Number: US 2019/0168432 A1
- Document ID: US20190168432A1
- Status: Published application
- Kind: A1
- Application number: 16/098,859
- Filed: 2017-05-10
- Published: 2019-06-06
- Earliest claimed: 2016-05-10
- Assignees: Roctool
- Applicants: Roctool
- Inventors: JOSÉ FEIGENBLUM
- Web page: https://patentgrep.com/patent/US20190168432A1

## CPC

- B29C 45/73: of the mould {(B29C45/2642 and B29C45/2737 take precedence)}
- B29C 33/06: using radiation {, e.g. electro-magnetic waves, induction heating}
- B29C 35/0805: {using electromagnetic radiation}
- B29C 35/16: Cooling {(cooling extruded material B29C48/911; cooling preforms for blow moulding B29C49/6427; cooling blown articles B29C49/66; cooling tyres during post cure inflation B29D30/0643)}
- B29C 2035/0811: {using induction}
- B29C 2035/1616: {using liquids}
- B29C 2045/7368: {combining a heating or cooling fluid and non-fluid means}
- B29C 2045/7393: {alternately heating and cooling}
- 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)

## Abstract

A mold, particularly for injection molding, includes a shell defining a cavity delimiting a molding surface, a heat accumulator and inductor heater, configured to heat the heat accumulator. A receiving surface, which is a part of a surface of the shell other than the molding surface, is either exposed to or shielded from the heat of heat accumulator, to bring the entire molding surface to a predetermined temperature to inject the material into the cavity.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

A mold, particularly for injection molding, comprising:
a shell defining a cavity delimiting a molding surface;
a heat accumulator;
induction heating coils configured to heat the heat accumulator; and
a receiving surface, which is a part of a surface of the shell other than the molding surface, either exposed to or shielded from the heat of the heat accumulator, to bring the molding surface to a predetermined temperature to inject a material into the cavity.

### Claim 13 (depends on 12)

The mold according to claim 12, wherein the shell comprises a circuit to circulate a heat transporting fluid to cool the molding surface.

### Claim 14 (depends on 12)

The mold according to claim 12, wherein the heat accumulator is a graphite block.

### Claim 15 (depends on 12)

The mold according to claim 12, wherein the heat accumulator comprises a phase change material.

### Claim 16 (depends on 15)

The mold according to claim 15, wherein the heat accumulator thermally expands to bring the heat accumulator in contact with and transmit the heat to the receiving surface.

### Claim 17 (depends on 12)

The mold according to claim 12, wherein the shell is displaced from the heat accumulator to shield the receiving surface from the heat of the heat accumulator.

### Claim 18 (depends on 12)

A method for heating the surface of a mold according to claim 12, comprising steps of:
heating the heat accumulator;
exposing the shell to the heat from the heat accumulator, to bring the molding surface to the predetermined temperature for injection; and
injecting the material into the cavity after the molding surface has reached the predetermined temperature for injection.

### Claim 19 (depends on 18)

The method according to claim 18, wherein the heat accumulator is heated while the shell is exposed to the heat from the heat accumulator.

### Claim 20 (depends on 18)

The method according to claim 18, wherein the shell is exposed to the heat by displacing the shell to face the heat accumulator.

### Claim 21 (depends on 20)

The method according to claim 20, wherein the heat is transferred from the heat accumulator to the shell by radiation.

### Claim 22 (depends on 21)

The Method according to claim 21, wherein heat is transferred partly from the heat accumulator to the shell by forced convection of a gas.

### Claim 23 (depends on 18)

The method according to claim 18, wherein step the shell is exposed to the heat from the heat accumulator by bringing the heat accumulator into contact with a surface of the shell.

### Claim 24 (depends on 23)

The method according to claim 23, wherein the heat accumulator thermally expands to contact the surface of the shell.