Supported standards

List of standards supported by Innoform

Details of the selected standard

Standard type:	GKV
Name:	GKV Blatt I- IV
Designation:	Prüf- und Bewertungsklausel für Polyethylen-Folien und Erzeugnisse daraus
Akkreditiert:	nein

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Tests of this standard

Sealing and welding properties of films, verification and comparison by laboratory sealing press
Production of sealing or welding seams on our laboratory sealing press (Kopp) and testing of the sealing seams with the Zwick tensile testing machine. The seals are made using previously agreed parameters. To create sealing curves individual parameters are varied, e.g. for determining the dependence of the sealing properties on the sealing temperature Ts [° C]. Of course, sealing curves can also determined depending on sealing pressure ps [N/cm] or sealing time ts [s]. Typically, a parameter is varied over 5 equal levels and the results are plotted graphically as a function of the variables (accredited test).

Seal seam quality of PE- pouches or sacks (temperature range -40 to +120 °C)
You send us in pouches, sacks or sealings made of polyethylene film. We determine the seal strength quality in [%] relative to film strength, according GKV-test and evaluation clause Leaf III or DIN 55543-3 per seal (e.g. bottom seam) n = 10 individual measurements to lot size 5000 pieces, additional measurements for larger lots optional. The strength of unsealed flim is measured and set in relation to the strength of the seal tested under identical conditions.

Roll length (running meters)
For practical reasons, the net material weight (i.e. minus the winding core) on the roll is used to determine the roll length, taking into account the determined mass per unit area and the web width. For shorter roll lengths (max. 50 running meters), it is also possible to unwind the film and measure the length oof the web with a calibrated measuring tape . Note: In the field of soft plastic films (e.g. made of polyethylene), the roll running lengths can be affected by elastic forces added during production if the measurement is carried out by a measuring device running on the material web within the production machine. The usual running length tolerance of ± 2%, for example, must therefore be increased by up to 10% for functional reasons or taken into account accordingly in the unwinding tension.

Dimensions and repeating patterns on pouches, bags etc.
Dimensions like width, length, side gusset depth on bags, reels, packagings, repeat measurements, with calibrated metal measuring stick n = 5

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Contact person

Heike Schwertke

+49 441 94986-14

heike.schwertke@innoform.de