FR3076372A1 - IDENTIFICATION PLATE WITH RFID-UHF FRESH GROSS RAW WOOD BALLOONS AND ELECTRO-MAGNETIC WAVE LOADS - Google Patents

Abstract

In the case of wood identification plates with UHF RFID and fixed on the cutting of fresh slaughtered wood and loaded with water, and with regard to the problem in a conflicting environment of reading produced by EM waves emitted by wood, the present document brings new solutions for reading and identifying UHF RFID.

Description

Identification plate with UHF RFID of logs of fresh felling and loaded EM waves (electro-magnetic).

The present invention relates to the identification of logs with UHF RFID

In modern forest and tree cutting management, foresters are increasingly using suitable readers to read inserts equipped with UHF RFID and attached to logs.

Let us quote a list of patents in the field of wood traceability with RFID UHF:

B. Leuvrey patents n ° 1501188, n ° 1202689, n ° 1102438, n ° 1103476, n ° EP 2 207 130B1, the Latschbacher patent US 202/0170213 A1, and the patent application B. leuvrey n ° 1600029 les bois costs of felling and therefore heavily loaded with water pose the problem of the conflict of EM (electromagnetic waves) emitted by the water of the wood component strongly present; the reading of the UHF RFID works in the frequencies from 860 to 960 Mhz; water emitting EM waves in the same frequencies, which causes 4 5 5 reading malfunctions until recognition of the UHF RFID number is impossible; this question is therefore very serious, with regard to the contractual obligation for the precise management and traceability of timber (number, cube, etc.) from the forest throughout the forest chain (designation of timber, felling, cubage, skidding, transport , and sawmill, including beyond such sheet / quality and in monitoring the traceability of wood used in other sectors 20 (architects, construction with wood, origin of wood, etc ...)

Patent application No. 1600029 already describes a wafer device equipped with UHF RFID (or called UHF RFID inlay), but in a device without plywood;

The presence of the counterplate (2) carrying a UHF RFID therefore brings here new technical advantages and described here in this document indeed showing an original and new solution 2.5 in the use of UHF RFID without dysfunction in their readings concerning the plates fixed on fresh felling timber and potentially loaded with water which can cause readings of the UHF RFIDs fitted to these plates to be prevented.

This document provides new solutions which are explained below.

the invention will be better understood through the following drawings:

FIG1 shows a simple plate (1) before receiving a backing plate (2) carrying the innovative device and carrying UHF RFID (3)

FIG2 shows the plywood carrying UHF RFID and equipped with an empty cage (5) before its placement and fixing under the plate (l)

35FIG3 shows a section of the overall device in operation and placed on the section of the log (6)

Recall the principle of the “Faraday cage” used here: when 2 conductive elements are opposed between an empty space, EM (electro-magnetic) waves cannot pass through this empty space;

Recall that the UHF RFID inlay (3) is conductive when it receives energy transmitted by waves (ll) from the reader (10) in its dialogue with UHF RFID (3), this in order to capture the information (for example a number) contained in the UHF RFID (3); UHF RFID (3) is located on the upper wall of the plywood (2) forming the upper element of the cage (7), said cage being empty (5) and pressing against the wood (6); this wood (6) felling costs and loaded with water at around 50% is thus and also conductive; 4 OEM waves coming from the wood (6) are therefore neutralized by the empty cage defined between the 2 opposite walls (2 and 9) integrated in the configuration of the plywood (2);

thus the capture of the information identifying the log (6) is therefore obtained; in order to reinforce the functioning of this device, it is also possible to add a standard conductor, for example carbon plate (8) placed at the bottom of the cage and pressing against the wood (6).

This new traceability device with UHF RFID (3) of the identification plates fixed to the logs (6), therefore includes 3 structural elements associated in their active functions:

a) the first element is the plate (l) which is transparent;

this in the 1st aim to allow the forester to check the presence of UHF RFID (3) and therefore to visually read the information (number, text, drawings, signs and various colors) necessary and useful for all visual checks, and so that for the 2nd purpose of protecting the counterplate (2) carrying UHF RFID (3) mainly against various shocks that are highly possible during the skidding operation of the logs; the plate is fitted with lugs (13) fixing it to the wood (6) and also includes small suitable hollow spaces situated against and under the plate to receive the male clips (4) facing the plywood (2 ) thus fixed and held under and against the plate (l).

b) the second element is the plywood (2) colored in its mass and therefore carrying an RFID-UHF inlay (3) on its upper face, which by its clips (4) is fixedly attached below and against the plate (l) ; the colored plywood (2) is thus and also an element of recognition according to various criteria defined by the forest operator.

the counterplate (2) is therefore clipped to the legs (13) and therefore held by dips (4) under and against the plate (l).

c) the plywood (2) on its underside comprises a cage (5), comprising at least 2 opposite sides (7) and preferably located opposite the tabs (l) for fixing the plate (l);

The cage open on the 2 other sides allows ventilation and avoiding its untimely and lasting filling (example: frozen water, earth); these openings (5) are preferably located opposite the lugs (13) of the plate (l) which protects them from possible filling of the void (5) of the more or less partial cage during the logging of the woods dragged to the ground by forestry tractors (skider), this attenuating and even canceling the effect sought in the function of the cage (5) which must remain empty.

The vertical walls (7) of the cage (5) are reinforced in order to avoid crushing of the 45cage (5) during the installation of the plate with a suitable hammer; the cage (5) can in a variant be completely closed on all its vertical sides and including the bottom (9), the upper face of the cage being the plywood (2).

The present invention relates to all other devices in similar applications.

Claims (1)

claims RI Traceability device with UHF RFID of identification plates attached to logs of fresh felling loaded with EM waves, characterized in that it is composed of 3 structural elements associated in their functions: 5 the plate (l), the plywood (2), the cage (5),: a) the plate (l) is transparent and carries below and against it a plywood (2), b) the plywood (2), is colored in its mass, and carries the RFID-UHF (3) on its upper and visible face, and is held by its clips (4) fixing it securely to the legs (13) and in position against the underside of the plate (l), | 0 c) the cage (5) is empty and integrated into and under the plywood (2), and partially closed or possibly open, comprising at least 2 structurally vertical sides (7) and opposite vis-à-vis, these 2 sides (7) preferably located in parallel and close to the tabs (l) for fixing the plate (l).