5 replies to this topic

[JPO]

We package products in metallized foil film.

All the metal detectable bandages we have been able to find use a metallized foil film between the adhesive strip and the back side of the wound pad.

The metal detector won't see the bandages as they are the same (or thinner) thickness of metal as the bag they might be in.

Are there any metal detectable bandages out there that use a wire coil or some other more detectable type of metal in the bandage?

What's the use in using metal detectable bandages that won't detect? Yes, I know they are blue and highly visible, but I need that neato CCP to go BEEP and kick out the bag if some foreign material is inside it.

Any good suggestions?

[QLD]

you could try ones with ferrous in them......

http://www.crestmedi...fill3576077.htm

[QLD]

some random reading also....

Blue Plasters - The Technical Bit






You are here Home Blue Plasters - Technical



DETECTABILITY OF BLUE PLASTERS

Why Blue Plasters?
It gives high visibility amongst food. Blue is the colour that does not naturally occur often.
Contamination
of food is illegal under The Food Safety Act 1990 “It shall be a
defence for the person charged to prove that he took all reasonable
precautions and exercised all due diligence to avoid the commission of
the offence by himself or by a person under his control.” Hence Blue
Plasters are widely used in areas of food preparation from sandwich
shops to butchers to cake manufacturers to large scale mass produced
food lines.

Why Metal Detectable Plasters?
To detect contamination in cans and foil packaging as well as cartons, trays etc.
Sources of Contamination can be:
Raw materials - wire in fabric
Personal effects – hair clips, coins, paper clips
Maintenance - swarf following repairs
In-Plant processing – metal slivers from knives

Blue Plasters with Aluminium Strip only ARE;
-Visually Detectable
-Metal Detectable as non-ferrous.
The Blue Plaster has an aluminium strip located behind the lint.

Blue Plasters with Aluminium Strip only ARE NOT;
-Metal Detectable as ferrous - there is no ferrous component in the Plaster.
-X Ray Detectable unless they contain tungsten.
-Detectable when used in conjunction with food packed into aluminium foil trays.

Blue Plasters with Aluminium Strip and contain Tungsten ARE;
-Visually Detectable
-Metal Detectable as non-ferrous.
The Blue Plaster has an aluminum strip located behind the lint.
-X
ray Detectable - They contain tungsten in the adhesive that holds the
aluminium strip in or has a small trace of tungsten in the pad.
Detectable when used in conjunction with food packed into aluminum foil trays.

Blue Plasters with Aluminium Strip and contain Tungsten ARE NOT ;
-Metal Detectable as ferrous - there is no ferrous component in the Plaster.

Sensitivity of the Metal Detector
Ideal setting should be to 2.5mm non-ferrous Metal Detectors respond to:
Amplitude
Detection Rejects when the signal exceeds a pre-determined level -
Ideal for longer metal pieces OR Narrow zone/zero crossover Rejects when
any signal is produced. Disadvantage is that when several different
size pieces pass almost together the signal from the largest piece fools
the detector, which may miss the following smaller piece.

Factors affecting sensitivity;

Type of metal.
Iron is easily detected, stainless steel is not.

Shape of metal.
Spheres
are easier to detect than thin wire of the same metal – eg 1.5mm dia
stainless steel ball equates to 1.6mm wire 8mm long for detection at the
same setting.

Orientation of metal in product.
Due to the
shape of the magnetic fields in a detector, certain parts of the field
are more sensitive compared to others, therefore potential blind spots
can occur.

Environmental Conditions
A detector operating next to a hot oven, freezing tunnels or vibration affects the sensitivity.

Product
Dry Products.eg cereals easy to detect metal
Fresh meat – creates an interference signal
Pickles – the vinegar creates a false signal
Treacle – very dense product high sensitivity required

To
ensure metal detection at low sensitivities the setting pieces used are
placed in the middle of products as well as on the product.
Therefore
if changing from one type of product to another, the detector settings
have to be changed due to the densities of the product.

Specification for Coverplast Metal and X Ray Detectable Plasters.

Dressings
are roughly equivalent to 3mm non ferrous metal, 3mm stainless steel,
and there are some potential starting conditions to aid detection which
are as follows Xray power 50 kV/2mA Velocity band conveyer 0.3metre per
second Detector effective pixel size 0.6mm Inspection opening 250mm x
150mm

[mgourley]

I guess my concern here would be IF you could find a bandage that properly detects in your process, how effective would that bandage be at actually being a bandage?
Metal detectable bandages generally have very poor adhesive qualities. I don't imagine that a bandage that properly detects in your process would improve on those poor adhesive qualities.

Marshall

[JPO]

I guess my concern here would be IF you could find a bandage that properly detects in your process, how effective would that bandage be at actually being a bandage?
Metal detectable bandages generally have very poor adhesive qualities. I don't imagine that a bandage that properly detects in your process would improve on those poor adhesive qualities.

Marshall

I've found a few x-ray detectable bandage companies that tell me that their products WILL show up in an x-ray detector (tungsten in the bandage apparently) .

The metal detectable bandages we got in as samples in the past had poor adhesive propertites. The plastic strip types did a terrible job sticking to your skin. The cloth strip bandages we got in had excellent adhesive properties, but would not detect in the x-ray equipment.

I'm hoping the two folks I found on Friday have products that are detectable AND that stick..

If either of the samples work, I'll post it here so someone else doesn't have to spend lots of time hunting for a solution.

[alediger]

What brands have you found? I have been working on this for a bit now and have only come across 1 company. Any help would be greatly appreciated.

I've found a few x-ray detectable bandage companies that tell me that their products WILL show up in an x-ray detector (tungsten in the bandage apparently) .

The metal detectable bandages we got in as samples in the past had poor adhesive propertites. The plastic strip types did a terrible job sticking to your skin. The cloth strip bandages we got in had excellent adhesive properties, but would not detect in the x-ray equipment.

I'm hoping the two folks I found on Friday have products that are detectable AND that stick..

If either of the samples work, I'll post it here so someone else doesn't have to spend lots of time hunting for a solution.