single wall paper bags

Single wall paper bags are used for the packaging of eg meat products and bread. These bags are glued at the side and bottom seams.

Side seam gluing of single wall paper bags
Most machines are fitted with a wheel adhesive applicator. The adhesive most commonly applied here is ENZIFLEX 450, however, if the paper quality requires superior bonding than a good alternative is the ENZIFLEX L22 V30. This adhesive can be applied at much lower application weights, hence reducing the price difference.

In case the adhesive is applied by means of an nozzle, it is imperative to use a dispersion adhesive, such as ENZIFLEX L22 V30. A number of machines are equipped with an adhesive consumption metering system. The latter resembles a ball-point pen, connected to a bottle that releases the adhesive in controlled quantities. The adhesive must be of low viscosity to guarantee adequate flow. The above adhesives are suitable for the bonding of standard quality paper. However, if the paper has a special coating, it is recommended to carry out a test run.

In cases where PE-coated with a sufficiently high surface tension of >40mNm is used, good adhesion is obtained using copolymer dispersion adhesives. If the surface tension is lower a special adhesive adhesive should be used. The solution to this potential problem is to use a better pre-treated PE-coated paper.

When coated paper is used water evaporization from the adhesive is slower, which will increase the setting time. It is not possible to laminate two papers coated with a non water absorbent layer. Aluminium coated papers can be bonded with copolymer adhesives.

Bottom seam gluing of single wall paper bags
All machines are fitted with top gluing. Our paste adhesive Solalim HP 17 is suitable for this application. The adhesive must be sufficiently viscous to prevent leaking. On the other hand, the adhesive must not be too viscous in order to be properly distributed onto the dosage roller. Otherwise too little or even no adhesive will be transferred to the bags thereby resulting in unsatisfactory gluing.

Standard quality papers can be glued well with the SOLALIM HP 17. Production problems can occur due to viscosity fluctuations that can result from temperature differences to which this adhesive is sensitive.

In case an unsatisfactory result is obtained while gluing coated paper with the starch adhesive SOLALIM HP 17, then it is possible to add a small quantity of dispersion adhesive, such as the ENZIFLEX L22 V30, resulting in improved adhesion. It must be kept in mind however, that this addition will decrease the viscosity thereby increasing the risk of leakage. This will also increase the setting time. If it is not possible to obtain good adhesion by adding ENZIFLEX L22 V30, then a better alternative is the ENZIFLEX PC 2. The latter is a dispersion adhesive that can be thickened to the consistency of a paste. This is done by adding the specified quantity of thickener, according to the instructions, under constant stirring. After a few hours the glue can be processed without problems.

Products for single wall paper bags:

Solalim: starch based adhesive which can be used as a side and bottom seam adhesive;
Enziflex: PVAc based adhesive used for different paper qualities;
Plastoflex: pressure sensitive adhesives for PP windows in single wall paper bags.
Plastomelt: mostly EVA based hotmelt adhesives
Plastomelt EXCELTA: metallocene hotmelt adhesives

The different product types can be adjusted per application and machine type. Please consult our sales and technical service staff for further information.

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