# US 2021/0276250 A1 · Method and apparatus for build material heating

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- Number: US 2021/0276250 A1
- Document ID: US20210276250A1
- Status: Published application
- Kind: A1
- Application number: 16/608,351
- Filed: 2018-01-24
- Published: 2021-09-09
- Earliest claimed: 2018-01-24
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Arthur H. Barnes
- Web page: https://patentgrep.com/patent/US20210276250A1

## CPC

- B29C 64/153: using layers of powder being selectively joined, e.g. by selective laser sintering or melting
- B29C 64/245: Platforms or substrates (support structures intended to be sacrificed after manufacture B29C64/40)
- B29C 64/295: Heating elements
- B33Y 10/00: Processes of additive manufacturing
- B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor
- B33Y 70/00: Materials specially adapted for additive manufacturing
- B29C 2035/0822: {using IR radiation}
- B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material
- 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)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- 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

A plate disposed between a lamp and a material to be heated is disclosed. The material absorbs a portion of the energy from the lamp and reflects a second portion of the energy. The plate absorbs the reflected energy and transmits the reflected energy back to the material.

## Claims

### Claim 1

An apparatus comprising:
means to apply heat to a layer of build material when present on a build platform, wherein the build material is to absorb a first portion of the heat and reflects a second portion of the heat; and
a plate disposed between the material heating means and the build material, the plate to absorb the second portion of the heat and re-emit the second portion of the heat to the build material.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the plate further absorbs heat from the material heating means.

### Claim 3 (depends on 2)

The apparatus of claim 2, further comprising:
a second plate disposed between the material heating means and the plate, wherein the second plate is highly transmissive to wavelengths of energy being emitted by the material heating means.

### Claim 4 (depends on 3)

The apparatus of claim 3, further comprising:
a third plate disposed between the plate and the build material, wherein a gap of air is disposed between the plate and the third plate.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein the second and third plates comprise fused quartz.

### Claim 6 (depends on 1)

The apparatus of claim 1, further comprising:
a coating disposed on all surfaces of the plate, wherein the coating supplies broad spectrum energy absorption of the plate.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the plate comprises a thermally conductive material for uniform heat distribution.

### Claim 8

A method comprising:
absorbing, by a plate disposed between a lamp and a material when formed/present on a target zone, energy reflected from the material; and
emitting the reflected energy absorbed by the plate to the material.

### Claim 9 (depends on 8)

The method of claim 8, further comprising:
heating the material using the lamp, wherein the material absorbs a first portion of the heat and reflects a second portion of the heat.

### Claim 10 (depends on 9)

The method of claim 9, further comprising:
absorbing, by the plate, the second portion of the heat.

### Claim 11 (depends on 8)

The method of claim 8, further comprising:
absorbing, by the plate, heat trapped between the plate and a glass plate disposed between the lamp and the plate.

### Claim 12

An apparatus comprising:
a plate disposed between a lamp and a layer of material when formed on a build platform, the material to be heated by the lamp, wherein the plate absorbs energy reflected from the material and emits the absorbed energy toward the material.

### Claim 13 (depends on 12)

The apparatus of claim 12, further comprising:
a first fused quartz plate being disposed between the lamp and the plate; and
a second fused quartz plate being disposed between the plate and the material.

### Claim 14 (depends on 12)

The apparatus of claim 12, further comprising:
an optical black paint to be coated upon all surfaces of the plate, wherein the plate heats to approximately 500 Kelvin.

### Claim 15 (depends on 12)

The apparatus of claim 12, wherein the material being heated comprises a PA12 polymer.