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Description

PRINTABLE RELEASE COAT FOR PP ADHESIVE TAPES
RELEASE ST1 is an heterogeneous solution of synthetic resins in alcoholic/hydrocarbon solvents.

Application

RELEASE ST1 is a new compound in solvent solution, designed to replace the normal Release coat (Release PP 25) in the production of PP tapes, in order to achieve tapes which will be printable with a one step printing machine (similar to PVC tapes, without using primer and release, and using only suitable inks).

Technical Specifications

Handling

Before use, RELEASE ST1 must be well stirred, when perfectly liquid and warm. Temperature of product should never be below 20°C before application (preferably between 40-50°C).
Dilution: 1 PP with 15 of toluene isopropylalcohol 70 : 30.
The final solution will be applied on treated PP film of 32-35 micron (38-42 dines/cm) for 4-5 g/sqm wet. Coating must be perfectly dried and adhesive must retain less than 0,6/sqm of residual solvent.
· Pick up rolls must carry 80 lines/cm
· SIAT MACHINE : heating of main cylinder is set up at 200°
· Rubber cliché must be resistant to hydrocarbons
· Drying system must be very efficient

Packing

50 / 200 liters metal drums

Storing

RELEASE ST1 gels at low temperatures and must be kept at 20°C or above.
In case of freezing, good heating and stirring will be necessary. Stirring must also be made every time before taking out partial quantities from containers. Shelf life is 6 months.

Notes

PP tapes coated with RELEASE ST1 can be easily printed in a one step process. However, the printing machine must have certain adjustments (we suggest to contact SIAT for the best setting up), viz. : the large cylinder (opposite to the printing rolls) must be heated at minimum 50 - 60°C. Before printing, a felt must brush off the surface very well. After printing, a good drying and cooling action must be provided by efficient fans.
We also have a proper range of polyamidic inks : Color Inks PP PAMC, high concentration polyamidic inks. We can sell them together with Additive ST2, a product that must be added to the PAM inks before printing (for example Color Inks PP PAMC100 pp. plus 50 - 60 pp. of Additive ST2 or 70 - 90 pp. for black ink).
Other suitable inks will be available in local markets. However, preliminary tests must be carried out with Additive ST2 to determine the best amount to introduce.
We can supply also Color Inks PP PAM+ADD., one component inks, ready for use.