# US 10,502,486 B2 · Heat treatment device comprising a screw provided with an electrically insulating strip

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- Number: US 10,502,486 B2
- Document ID: US10502486B2
- Status: Granted
- Kind: B2
- Application number: 15/301,568
- Filed: 2015-03-11
- Published: 2017-04-27
- Granted: 2019-12-10
- Earliest claimed: 2014-04-24
- Assignees: E.T.I.A.—Evaluation Technologique, Ingenierie Et Applications
- Applicants: E.T.I.A.—Evaluation Technologique, Ingenierie Et Applications
- Inventors: Olivier Lepez; Philippe Sajet
- Web page: https://patentgrep.com/patent/US10502486B2

## CPC

- F26B 3/24: the movement being rotation
- B65G 33/24: Details
- B65G 33/265: {with a continuous helical surface (flexible screws B65G33/16)}
- F26B 17/20: the axis of rotation being horizontal or slightly inclined
- F26B: DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM (drying devices for combines A01D41/133; racks for drying fruit or vegetables A01F25/12; drying foodstuffs A23; drying hair A45D20/00; body-drying implements A47K10/00; drying household articles A47L; drying gases or vapours B01D; chemical or physical processes for dewatering or like separating liquids from solids B01D43/00; centrifugal apparatus B04; drying ceramics C04B33/30; drying yarns or fabrics in association with some other form of treatment D06C; drying frames for laundry without heating or positive air circulation, domestic laundry-or spin-driers, wringing or hot pressing laundry D06F; furnaces, kilns, ovens F27)
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)

## Abstract

The invention relates to a device for the heat treatment of a product, comprising an enclosure, means of conveyance inside the enclosure, which comprise a screw mounted so as to rotate in the enclosure about a geometrical rotational axis and means for rotating the screw about said axis, and means for heating the screw by Joule effect. According to the invention, the screw comprises a strip which is made of an electrically insulating material and is applied to the screw so as to form an outer circumference of the screw.

## Claims

### Claim 1

A device for applying heat treatment to a substance, the device comprising:
an enclosure;
conveyor means for conveying the substance between an inlet of the enclosure and an outlet of the enclosure, which conveyor means comprise a screw mounted to rotate inside the enclosure about an axis of rotation and include drive means for driving the screw in rotation about said axis; and
means for heating the screw by the Joule effect;
wherein the screw includes a strip made of electrically insulating material that is fitted on the screw so as to form an outer periphery of the screw.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the strip is arranged to form the entire outer periphery of the screw.

### Claim 3 (depends on 1)

The device according to claim 1, wherein the strip is made of polytetrafluoroethylene.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the strip is made of polyetheretherketone.

### Claim 5 (depends on 1)

The device according to claim 1, wherein the strip is of thickness lying in the range 4 mm to 20 mm.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the strip is snap-fastened on the screw.