3 What are milk filters made of? Milk filters are made from nonwoven materials that wholly or mainly consist of fibres. The fibres are arranged randomly or in specific directions and are bonded through mechanical interlocking or adhesive bonding. The following fibres and nonwoven bonding methods are used for the production of milk filters: Fibres (most fibre blends) Cotton = natural fibre biodegradable very short fibres low tensile strength high costs Viscose = synthetic fibre made from natural polymers swells and absorbs very stretchy when wet Polyester (PES) = synthetic fibre made from synthetic polymers very long fibres excellent tensile strength can be partially heat bonded Nonwoven bonding methods Chemical: chemical binders Mechanical: Needling (fibre-bonded nonwoven) What kinds of milk filters are there? Filter discs or filter socks are used to filter raw milk depending on the milking machine. Filter discs (nonwoven jug filter) Filter socks / filter hose What production methods are there to produce filter socks? Seam Weld Adhesive bond Bonding the nonwoven material with yarn Melting the fibres • thermal • ultrasound Bonding the non-woven material with adhesive suitable for all nonwoven materials no foreign matter such as yarn or glue high tensile strength of bonded lengthwise seams (high resistance to shear forces) uniform quality high tensile strength of thermally bonded lengthwise seams (high resistance to shearforces) bondable nonwoven material and food-safe adhesive necessary strong widthwise seam lower manufacturing costs higher manufacturing costs Perforation requires unusual bondable fibres
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