What sensitivity can I expect on a 400 mm wide machine?

The published table gives iron sensitivity of 0.8 mm at a 100 mm channel height, 1.0 mm at 120 mm, 1.2 mm at 150 mm, 1.5 mm at 200 mm, 2.0 mm at 250 mm, 2.5 mm at 300 mm and 3.0 mm at 350 mm, all measured on a 400 mm channel width. Quote the figure for the window you actually buy, and put that number into the specification.

Which rejection method suits foil pouches?

For light, flat pouches, belt sinking or a flap is gentle and effective. For small light packs at speed, air blow is the usual choice. A pusher suits heavier or boxed items and higher throughput. If nothing may leave the station without a decision, use alarm-and-stop with the 12 V buzzer and inspect the pack by hand.

What do you need from me before quoting or testing?

Pack dimensions and fill weight, the tallest pack that will run on the line, line speed and belt width, your required test piece (material and size in millimetres), and whether the foil is laminated to a plastic film. For a test report, send three filled samples — we will run them and tell you the smallest iron test piece the machine stops.

Aluminum Foil Metal Detector: Why Standard Units Fail

Q: Do the CQ-YW806 and CQ-YW807 detect stainless steel?

No. They are ferrous detectors: iron, steel and nickel. Austenitic stainless grades such as 304 and 316 are effectively non-magnetic and are outside their scope. If your specification includes stainless steel or non-ferrous metals in foil packaging, X-ray inspection is the appropriate technology, because it discriminates by density.

Guide pro imballaggio in foglio di alluminio

Aluminum Foil Metal Detector: Why Standard Units Fail

Tempus Legentis about 7 min Written for responsabili del controllo qualità per imballaggi alimentari e acquirenti di attrezzature Examinatio technica valori da scheda tecnica, conferma da fabbrica in sospeso

Un sacchetto laminato in foglio di alluminio esce dal riempitore e passa attraverso il rilevatore di foglio di alluminio metal Detector testa, e non accade nulla — neppure con un frammento di ferro da 1,0 mm posizionato all’interno della saldatura. Questa è la lamentela che riceviamo più spesso da chi imballa snack, caffè e dolciumi, ed è quasi mai un problema di impostazione. Ecco perché il foglio di alluminio rende inefficace un comune rilevatore di metalli, cosa vede (e cosa non vede) una macchina specifica per metalli ferrosi, e come specificarne una affinché i valori nel vostro file di audit risultino validi.

metal detector touchscreen control panel showing signal strength, threshold and product counters — Pannello operatore del rilevatore di metalli per foglio di alluminio: intensità del segnale, soglia, contatori prodotto e selezione della modalità di allarme su un unico schermo.

Perché il foglio di alluminio rende inefficace un comune rilevatore di metalli

Plurimi detectoris de convectore sunt instrumenta cum duobus coilis aequilibratis. Illa operantur per currentes eddy: campum coilis perturbat quodlibet objectum conductivum quod per eum transit, et machina perturbationem indicat. Saccellus de folio aluminium est magnus, continuus lamina conductiva. Signum quod producit est immensum ad comparationem cum particula 1 mm, et utrumque signum simul advenit, in eodem canalibus.

Operatores solent hoc solvere per discendum effectum producti. Machina docetur signaturam saccelli, deinde omnia quae ei respondent ignorat. Hoc valet dum impachetatio perfecte repetibilis est. Statim ut pondus implendi mutatur, aut impachetatio alio angulo sedet, aut folium aluminium est diversum laminatum, signatura discita iam non congruit, et duas malas optiones habes: aut tolerantiam dilatas et parvas particulas amittis quas detegere debuisti, aut eam stringis et bonos impachetatus interdum reicis.

Quid detector metallorum de folio aluminium quaerit — et tres res quas videre non potest

Le CQ-YW806 et CQ-YW807 , the two aluminum foil metal detectors we build, belong to that family. Instead of eddy-current balance, they use magnetic induction with permanent-magnet signal processing and upper and lower dual induction coils, tuned to the ferromagnetic response of the contaminant. In practical terms: the machine keys on magnetic permeability, not on conductivity. Aluminum foil has almost no magnetic response, so the packaging largely drops out of the measurement, and the detection field stays available for iron.

What it catches: iron filings and wear particles from cutting, grinding, sieving and mixing; broken needles and pins; staples and clips; wire fragments; and ferritic — that is, magnetic — stainless grades.

What it does not catch, and this is the part that decides whether one machine is enough:

Austenitic stainless steels. The 304 and 316 grades, from which most food-contact parts, blades, screens, and fasteners are made, are effectively non-magnetic. A ferrous-only instrument will not detect a 304 fragment, regardless of its size.

Non-ferrous metals. Aluminum, copper, brass, and their alloys produce no useful magnetic response.

Non-metals. Glass, stone, bone, hard plastic, rubber, and wood — no magnetic response at all.

Specifying an Aluminum Foil Metal Detector: Window Size vs Sensitivity

Every aluminum foil metal detector is sold with a table, and the table — not the headline sensitivity — is what your auditor will read. Here is the CQ-YW806/807 table as published :

Model: 4010 / 4012 / 4015 / 4020 / 4025 / 4030 / 4035

Detection channel height: 100 / 120 / 150 / 200 / 250 / 300 / 350 mm

Fe sensitivity (sphere diameter): 0.8 / 1.0 / 1.2 / 1.5 / 2.0 / 2.5 / 3.0 mm

Detection channel width: 400 mm as standard, customizable 200–2000 mm

Legere ut curvam compromissionis. Minima apertura, 400 × 100 mm, dat ferrum 0.8 mm. Si altitudo ad 350 mm extenditur, valor certus ad 3.0 mm derivat.

Itaque specificare hoc ordine:

Incipere ab opere probando quod analysis periculi postulat, in millimetris ferri.

Mensurare altissimum productum quod unquam in linea currere poterit, incluse confectione quae super cingulum eminet.

Eligere minimum altitudinem canalis quae illud libere transmittit, cum parva margine.

Deinde confirmare latitudinem cinguli et velocitatem lineae: 400 mm est norma, et haec machina operatur ad 25–30 m/min.

conveyor metal detector with touchscreen head, tower alarm light and stainless collection tray — Detector metalli folii aluminium: caput cum tactilis schermo, lucerna turris pro allerto, et vasculum collectivum ex accipitro.

Circa detector metalli folii aluminium: carapax, cingulum, et reiectio

Uterque detector metalli folii aluminiumi utitur speculo ferro-nickeleo 3 mm pro carcasse, cum tota machina ex ferro-nickeleo 304 constructa. Haec crassities non est ornatus. Tenet geometriam coilis stabiliter contra vibrationem et tensionem cinguli — causam communissimam machinae quae examen in officina superat sed in fabrica aberrat — et superficies polita nihil loci praebet ad accumulationem producti.

Reiectio est ubi ipsa confectio folii momenti habet, quia confectio folii levis est, plana et facile laeditur. Methodi adhibibiles sunt:

Submersio cinguli — pars cinguli deorsum cadit et confectio in cistulam cadit. Mitis, optima pro confectionibus planis et pro pRODUCTOS quae durius tractari non debent.

Lamina — lamina articulata confectionem a cingulo expellit. Simplex et fidabilis ad velocitates moderas.

Efflatio aeris — iactus aeris temporatus confectionem ad latera impellit. Optima pro confectionibus parvis et levis ad velocitatem, et electio ubi nihil tangere productum vis.

Pusher — a pneumatic ram pushes the pack off the belt. Suits heavier or boxed items, and higher throughput.

CQ-YW807 ferrous metal detector with touchscreen control panel for aluminum foil and metallic film packaging — The CQ-YW807 aluminum foil metal detector in its packaging-line build: imported control board, infrared sensor, touchscreen panel and a 304 stainless steel body. The blue area is the detection field across the belt.

Aluminum Foil Metal Detector: Frequently Asked Questions

Can a metal detector detect metal through aluminum foil?

Not a standard balanced-coil unit — the foil's conductive signal swamps a small particle, which is why an aluminum foil metal detector uses a different principle. A ferrous-specific machine such as the CQ-YW806 or 807 can detect iron and steel inside a foil pouch, because it responds to magnetic permeability rather than conductivity. It will not detect the aluminum foil itself, and it will not detect austenitic stainless steel 304 or 316.

Do the CQ-YW806 and CQ-YW807 detect stainless steel?

Non. Hi sunt detectoria ferrosa: ferrum, stahl et nickel. Gradus austenitici stainless, ut 304 et 316, sunt effectivé non-magnetici et extra ambitum eorum cadunt. Si specificatio tua includit stainless steel aut metalla non-ferrosa in emballagio foliaceo, inspectio radiographica est technologia apta, quod discriminat per densitatem.

Quam sensibilitatem expectare possum in machina 400 mm lata?

Tabula publicata dat sensibilitatem ferri 0,8 mm ad altitudinem canalis 100 mm, 1,0 mm ad 120 mm, 1,2 mm ad 150 mm, 1,5 mm ad 200 mm, 2,0 mm ad 250 mm, 2,5 mm ad 300 mm et 3,0 mm ad 350 mm, omnes mensuratae in latitudine canalis 400 mm. Cita numerum pro fenestra quam vere emis, et illum numerum in specificatio pone.

Quae methodus rejectionis convenit ad saccula foliacea?

Pro leves et planas saccos, subsidentia cinguli aut lamella sunt lenes et efficaces. Pro parvis levisque sarcinis in velocitate, efflatio aerea est optio communis. Impulsor aptus est ad sarcinas gravioras aut in caelulis contentas et ad altiorem fluxum. Si nihil ex statione exire potest sine decisione, utere alarma et arrestu cum buzzer 12 V et sarcinam manu inspice.

Quid ex me postulas antequam pretium do aut experimenta facio?

Dimensiones sarcinarum et pondus implentis, altissima sarcina quae in linea currere potest, velocitas lineae et latitudo cinguli, tua petita particula experimentalis (materia et magnitudo in millimetris), et an folium est laminatum ad pelliculam plasticam. Pro relatione experimenti, mitte tres sarcinas impletas — eas nos curremus et tibi dicemus minimam particulam ferream quam machina arreptat.

five rejection methods for a conveyor metal detector: belt sinking, flap, air blow out, pusher and lever — Quinque methodi reiciendi: subsidentia cinguli, lamella, efflatio aerea, impulsor et vectis.

Foil packaging does not have to be a blind spot in your quality system — but it needs an aluminum foil metal detector built on the right principle, a window size chosen from your test piece rather than from the price list, and a rejection method that suits a light, flat pouch.

Send us your pack details, or three filled samples, and we will run them on the CQ-YW806 and report the smallest iron test piece the machine stops. If your specification also covers stainless steel, glass or stone, ask about X-ray inspection on the same line — we build both, and we will tell you which one you actually need.