# US 9,751,250 B2 · Device for heating preforms consisting of thermoplastic material

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- Number: US 9,751,250 B2
- Document ID: US9751250B2
- Status: Granted
- Kind: B2
- Application number: 14/900,583
- Filed: 2014-06-27
- Published: 2016-05-26
- Granted: 2017-09-05
- Earliest claimed: 2013-06-27
- Assignees: Khs Corpoplast GmbH
- Applicants: KHS Corpoplast GmbH
- Inventors: Frank Lewin; Michael Linke; Deniz Ulutürk
- Web page: https://patentgrep.com/patent/US9751250B2

## CPC

- B29C 49/6835: {using reflectors}
- B29B 13/024: {Hollow bodies, e.g. tubes or profiles}
- B29C 35/0805: {using electromagnetic radiation}
- B29C 49/6418: {Heating of preforms}
- B29C 49/06: Injection blow-moulding
- B29C 2035/0822: {using IR radiation}
- B29C 2949/0715: the preform having one end closed
- 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)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

## Abstract

A device for heating thermoplastic preforms, including a heating channel formed from a heating module and through which the regions of the preforms to be heated are guided by a conveyor device. Radiant heaters are arranged on a side wall of the heating channel. In the region of a side that lies opposite the radiant heaters and/or the base of the heating channel, reflector elements which act as counter or base reflectors are arranged. The reflector has a reflection layer and a carrier layer. The reflection layer includes a material with a silicon dioxide base and an IR reflection value greater than 90% in the range of 500 to 2500 nm. The carrier layer is a material with greater mechanical strength than the reflection layer and is used as a carrier for the reflection layer. Both layers have a similar coefficient of thermal expansion and are permanently interconnected.

## Claims

### Claim 1

A device for heating preforms of thermoplastic material, comprising: a heating module that forms a heating channel through which parts of the preforms to be heated are conducted in sequence by a conveying device, wherein heating devices that emit infrared radiation are arranged on a side wall of the heating channel, and reflector elements are arranged in an area of a side wall opposite the heating devices and/or in area of a base of the heating channel to serve as a counter-reflector and a base reflector, which reflector elements ensure a lowest possible heat loss in the heating channel, wherein the reflector element serving to form the counter-reflector and/or base reflector has two layers, comprising a reflective layer and a carrier layer, wherein the reflective layer comprises a material based on silicon dioxide with an IR reflection value of greater than 90% in a range of 500-2500 nm, wherein carrier layer consists of a material with a mechanical strength greater than the mechanical strength of the reflective layer and is a support for the reflective layer, and wherein the two layers have similar coefficients of thermal expansion and are bonded permanently to each other.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the reflective layer comprises a silicon dioxide content of more than 95%.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the reflective layer comprises a silicon dioxide content of more than 99%.

### Claim 4 (depends on 2)

The device according to claim 2, wherein the reflective layer is a two-dimensional molded part produced from amorphous silicon dioxide fibers.

### Claim 5 (depends on 1)

The device according to claim 1, wherein the carrier layer is a two-dimensional molded part containing quartz glass, aluminum silicate, or calcium silicate.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the reflective layer is applied to the carrier layer by a wet method.

### Claim 7 (depends on 6)

The device according to claim 6, wherein the reflective layer is applied to the carrier layer by spraying or dipping.

### Claim 8 (depends on 1)

The device according to claim 1, wherein the two layers are bonded to each other by an adhesive or by lamination.

### Claim 9 (depends on 1)

The device according to claim 1, wherein the reflective layer has a thickness that is no more than 50% of a thickness of the carrier layer.

### Claim 10 (depends on 1)

The device according to claim 1, wherein at least one of the reflector elements is arranged so that the carrier layer of the reflector element faces the heating channel.