ESCHENLOHR produces a valuable label-glue on casein basis.
The product is declared as E500K.
This quality glue with a high amount of casein is especially qualified for difficult applications.
We stock Pasteur-glues as commodities.
The particular characteristics of casein-glue are:
- High initial-adhesion
- High wet adhesive-power
- High resistance to water
- Good leach-solubility
- Good pump-capability
- Good mobility of machinery
- Natural-raw material
That implies the following advantages:
- High endurance of condensation
- Easy to handle in the bottle washing machine
- Good processing attributes
That implies again the following benefit at the labeling:
- Qualification for wet, dry, cold and warm surfaces
- Qualification for tinfoiling
- Qualification for reusable bins
- Qualification for glasses, bottles, cans
- Qualification for high operating speed
- Qualification for pasteurized bins
Info-Box: Casein (lat. Caseus = Cheese)
|Casein is the genus for the main group of albumin (phospho- proteins with the major constituents alpha-, beta- and gamma- casein) in the cow`s milk (24-28 g/l). They act as a structure biner at the quark-, yoghurt- and cheese- production. Current suspended as a calcium-caseinate in raw milk, they are affected by acid addition (lab, lactic acid generating bacteria, mineral acids) as casein, as a secondary product (filtrate), developing whey. After the following outcrop with lye (alcali), the glue attributes and the water-solubility are reached: The leftover of phospate will be split off, the peptide-chains will be embedded together; to get the sticky consistency.
About 1000 kg of milk are needed to get 30 kg of casein. Casein as a natural raw material, is subjected to bigger price fluctuations.
Technical casein is produced analogical by acidifying with sulphuric acid. Hence produced caseinates act as additives in the meat industry, for coffee whitener or whipped creams.
Applications of Casein:
Glue (labeling of bins for the beverage- and food industry, construction- and wood glue)
Short schedule over also applied glues at the labeling:
- Starch-glue (wet-adhesion)
- Dextrine-glue (wet-adhesion)
- Hotmelt, hot-glue (smelting-adhesion)
Criteria for the assortment of the adapted label-glue:
- Label-raw material (such as paper, alloy, foils)
- Label surface (print colour, coating, imprint, metallization), -shape and -size
- Bins (material, surface(s-allowance))
- Processing conditions (air humidity, temperature at bottling/ labeling, label-machine)
- Storage conditions
The grammage and the absorptive capacity, the structure,
the rolling friction and the water vapour permeability, including,
are appointed by the applied raw material and therewith the
success of labeling.
Alloy-foil or alloy-vaporized papers are, for example, almost
Impervious to water vapour, that aggravates the dry off the glue. Furthermore, alloy consisting labels are stiffer and there-
fore difficult to handle.
Against this, punched foils (PE, PP, PET…) are displaying midget
holes, which are previous to air and benefitial for the glue dry off. They are applicated, where conventional papers are non qualified, based on particular climatical, chemical or mechanical strain.
Print colours are applied for informations- and marketing purposes, coatings as protective layer. The both laminations are compressing the paper partial and have control over the permeability of air and water: The fibres are swelling, if the water of the adhesion is damed up under the surface by a high densed surface. The consequences: Creases are evolving and the lye penetration is disturbed at the cleaning, it is related with a defered label removal in the washing machine.
The 3. type of label-lamination is the metallization. It sets a special requirement to the paper surface and demands therefore a coincident imprint.
The dry off the glue is benefital by imprinting, the lye-penetration is amended at the cleaning and contrary to condensation at sizing. Coined papers are to identify at a certain throatiness, sometimes they are stiffer then untreated papers.
The selection of the glue is strong complying with the material. While casein-glue is substance for the choise of labeling of glasses, bottles and cans, mostly dispersal- or hotmelt-adhesives are applied for practice at plastic-bins (e.g. PET-bottles). The surface finish is used for the scratch protection and consistency at glass surfaces. Especially for bottles, which are used for the botteling of highly carbonated beverages (e.g. sparkling wine), the quality of the surface finish is relevant.
The operating range of our casein-glue are normal and faint quenched glass-surfaces.
Operating- and Storage-conditions:
The observance of the „right“ (i.e. producer declared) humidity- and temperature.parametres during the processing and storaging is decisive for the label success. For example raw labels, stocked in extremely dry rooms, can dehydrate by contraction of the fibres, before the labeling. The usage leads to folds and high corners and rims.
To high humidity in combination with warm air, however, leads to a glue-hiking by condensation on colder and/ or wet bins: The humidity condenses on the cold bin-surface, the glue can be separated off an “hiking”. Additinal folds- and mould-cluster are the consequences.
The viscosity of the glue being a function of the temperature, alterations have effects in both directions: Is the temperature higher against the glue-producers declaration, the viscosity drops. The glue is going fluid and tends to more splashing in the processing. Furthermore, the initial adhesion drops down. Is the temperature lower, the heat-aggregates of the labeling-machine takes to long to get the glue on the processing temperature, the pump capacity is getting worse.
The labeling-machines affect the labeling result by their age (wastage, attendance), flow speed and other parameters. For example by wastage of the gummed surface, the lay of adhesion is changed and with it the adhesive result.
Directions for the right handling of the glue:
Storage of the glue: In original closed vessels
preferably at ambient temperature, but not under 5 C, min. 6 month storable
Processing advice: 25-35 C, ideal at 28-30 C
Packaging Units and Technical Data:
A glue-bucket or even Hobbock contains 31 kg of glue; a ESCHENLOHR-pallet comprehends 12 Hobbocks, so 372 kg.
Adhesion-definition in accordance with DIN 16920: Nonmetallic materials, which are binding bodies by surface-adhesion (=adhesion) and internal consistancy (= cohesion), without the essential change of the fabric of the bodies.
Info: Casein-glue as a wet-adhesion counts to the physically undoing glues: These are sticking without substantial alteration.