Contec liquid filtration

COLF is the name of Contec's Liquid Measurement division. It stands for Contec Liquid Filters.

Housings made of stainless steel are very resistant to temperature and pressure. If an application involves high pressures and temperatures, Contec stainless steel filters are the go-to solution. The surface can also be treated (polished) so that no germs, bacteria or other microorganisms can adhere to it.

Whenever aggressive media such as acids or lyes are to be cleaned, plastic is the material of choice for filter housings. Contec also offers special filter housings for the chemical and seawater areas.

Meltblown filter candles are manufactured with the meltblown process. Finer and coarser fibers are built up to a multi-layer structures with the finer layers inside and the coarser ones outside. There is a multi-layer gradation. Large particles can be retained in the outer layers and smaller ones in the inner layers.

To create wound filter candles, string is wound around a support (string winding process). Different strings can be used to cover virtually all media, from neutral to aggressive. Wound filters are robust and can absorb lots of contamination (long service life). Other advantages of wound candles are their low differential pressure and high flow capacity.

• pre-filtering in water treatment chemicals
• process filters for solvents
• electroplating
• surface engineering
• oils, greases
• painting and lacquering industry

Activated carbon is a natural product based on natural carbonic raw materials. Its porous structure gives it a very large inner surface, allowing it to bind chemical compounds and molecules.

Activated carbon filters are used to reduce dissolved organic contamination (color, odor, and taste contaminants, chlorine, pesticides and medication residue). For example:

• water treatment
• chlorine separation
• drinking water
• pesticide separation
• pharmaceutical products
• organic material separation
• food and cosmetics
• color and odor removal

Microfiltration is a purely physical separation process. It usually requires no chemical additives. Microfiltration performs separation according to the mechanical size exclusion principle, that is, the filtration principle. For instance, substances in water such as wastewater that are larger than the membrane pores are retained by the diaphragm. Filtration with a diaphragm pore size smaller than 0.1 µm is called ultrafiltration. Filtration with a pore size larger than 0.1 µm is called microfiltration.

Diaphragm filtration is substance separation with filter elements that use porous diaphragms of defined fineness as a filter medium.

A distinction is made between

• microfiltration (pore size about 0.1 – 10µm) and
• ultrafiltration (pore size about 0.001 – 0.1µm)

Separation is largely on the diaphragm surface. The average diaphragm pore size essentially determines the separation effect.

Contec diaphragm filters are always used when high levels of purity for the suspension to be filtered are desired. Contec diaphragm filters can be used most economically when the particle load for the suspension to be filtered is very low. Thus there should be pre-filtering to protect the high-quality diaphragm filter elements from clogging too quickly. Contec would be happy to advise you on these principles.

There are many uses for Contec diaphragm filters. They include the following:

• water treatment (ultra-pure water, demineralized water)
• pharmaceutical products
• food
• beverages (wine, beer, spirits, sparkling wine, mineral water, etc.)
• cosmetics
• high-purity chemicals
• photoresist
• ink
• as a point-of-use filter

The beta value or beta ratio is the proportion of the number of solid particles > x µm before and after filtration.

For example:

• Beta 10 is a separation of 90% of particles of the indicated fineness
• Beta 5000 is a separation of 99.98% of particles of the indicated fineness

Wedge wire filters are also called slot tube filters and are characterized by their simple and fast filtering process Their innovative functionality allows manual or automatic cleaning without interrupting filtration and with minimum product loss during solids discharge.

Contec wedge wire filters can be used with almost all liquids (media), from watery to highly viscous. Examples include the following:

• paints and lacquers
• emulsion paints
• printing inks
  underseal
• tar products
• cooling lubricant
• adhesives
• solvents
• transmission oil, rolling oil, rapeseed oil
• emulsions
  electrophoresis lacquer
• chocolate mass
• yeast
• plasticizers
  polyurethane

Filtration goes from the outside of the filter element to the inside, with the solids accumulating on the outside. Cleaning proceeds as follows: The geared motor turns the cylindrical filter element. Particles that are larger than the slot in the filter element accumulate on the surface and are scraped off by a blade. The solids collect in the bottom of the filter housing (filter sump), where they can be removed manually or released automatically and disposed of.

Contec filter bags are used to filter solids from liquids in such applications as water treatment, the electronics and photography industries, chemicals, surface engineering etc. Filter bags are made of a variety of materials and are easy to harmonize with a specific medium and filtration degree. Filter bags are an economical filtration solution.