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ePaper created 2015-02-11, 12:30:33 | version 1.34.01
Author Manuel Füstmann Product Manager Paper | Packaging Industry 18 glue dots of the brik surface was not always accurate (slip in the transport belt) and the wettability of the OPP foil wrapper was inadequate and exhibited high tolerances in the surface tension. These effects are typical for beverage aggravated by a different slip effect of the beverage carton sizes on the line. Besides the size of the base surface area, varying materials (paperboard, metallised surfaces) and transport conditions in the line (belt lubricators ...). All these factors are challenges and require a permanent setting of the line to the correct pressure point for the straws. The enormous line speeds additionally make this system more susceptible to failure. The solution: inverse straw bonding A tried and proven principle from the adhesive application technology supplied the solution for optimum process design: “The best possible bond is (most often) achieved when the adhesive is applied to the more the adhesive was applied onto the surface of the PE-coated beverage carton. To apply it to the OPP foil in which the straws are wrapped proved to be clearly more effective, since this foil has a much lower surface tension realisation led to the method called inverse bonding. This process has the additional advantage of reducing the effect of package slip on the conveyor which fall off throughout the entire transport chain from manufacture to end customer is now tending towards zero. The engineering answer implement- ing this new application process pro- fessionally is a special, very slim adhesive application nozzle, which can be integrated easily into the straw applicator. Cooperative top solutions Bonding is a system process. The readiness to cooperate, and compe- tence in support and service, turn good components into powerful production systems. A powerful adhesive has to achieve good bonding results and processing characteristics, and the cooperation among customer and manufacturing team also has to match perfectly. This will allow the existing potential for rationalisation in the engineering technology to be fully exploited, in order to stay compatible in the race of ever-increasing market demands. Jowat-Toptherm® 256.05 PO hot melt adhesive with excellent adhesion to various substrates like OPP foil on high-speed straw applicators (Tetra Pak, Geyssel) at line speeds of up to 28,000 packs/hour. temperatures, neutral odour. Open time: 3 - 5 s Setting time: short Density: 0,90 g/cm³ Colour: white, translucent Softening range: 110 °C Ring & Ball, ASTM 3461 Approved for food contact according to EU 10/2011 and FDA 175.105. Info All depends on the pressure point: Jowat Application Engineers determined the causes for the failure rate in straw attaching by using cross-industry methods.