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Gluing Instructions for Preciosa Stones
Correct Procedure for Gluing Preciosa Stones
When using new untried adhesives or applying the stones to unknown carrier materials, it is recommended to run a peeling test (see below) first, at the same time strictly observing technical instructions given by the adhesive’s manufacturer.
Achieving optimum joint strength
To achieve optimum joint strength, it is necessary to glue the stones only onto suitable carrier materials, offering a sufficient contact area that ensures the required adhesion of the stone.
The thickness of the adhesive’s layer is an important factor and, therefore, it should be adapted to different parameters of the stones as well as carrier materials used.
The amount of the adhesive used
Optimum amount of the adhesive - Each stone size requires a corresponding amount of the adhesive. To achieve top quality of the glued joint, we recommend using adhesive dispensers. These help you to choose the optimum dose of the adhesive, ensuring the best possible adhesion.
The lack of the adhesive results, as a rule, in too thin a layer of the adhesive, or in the adhesive unevenly covering the stone’s back. This may cause the adhesion to decrease and so the probability that the stone may detach is higher.
Larger than optimum amount of the adhesive may stain the fabric around the stone, the reverse side of the textile carrier material or the surface of the stone. This is characterized by a distinctive strip of the adhesive irregularly surrounding the stone, or by an unsightly great smudge on the reverse side of the textile material.
When gluing larger stones, mind that the adhesive slightly surrounds the stone’s girdle after having been pressed onto the carrier material. Otherwise, the sufficient joint strength is not guaranteed and it is more than likely that the stone will detach.
Gluing stones onto elastic carrier materials
Before gluing fashion jewellery stones onto elastic, i.e. “stretch” materials (knitted fabrics, fabrics containing polyurethane fibres, e.g. Lycra, nylon stockings etc.), it is advisable to pre-stretch them slightly first. This simple technique helps decrease the forces that could cause future adverse joint stress.
Follow the recommended procedure:
1. Prepare the carrier material.
2. Check the stone for cleanliness; if it is not clean, clean it.
3. Make sure that the selected adhesive is suitable for the carrier material used, meeting technical
requirements specified in the instructions given by the adhesive’s manufacturer.
4. To test the adhesive, select a scrap piece of surplus carrier material. If it is not available, try to find
an unseen part of the material used, where you can carry out the test without fear of spoiling the final
5. Apply an appropriate dose of adhesive to the carrier material or to the stone’s back according to the
6. Applying gentle pressure, press the stone onto a drop of adhesive placed on the carrier material.
7. Let the adhesive set according to the manufacturer’s instructions.
8. After the adhesive has set, it is advisable to run a peeling test. If the results are satisfactory, you can
continue gluing the remaining stones.
A Peeling Test
A peeling test has been specially developed to test the joint strength, i.e. the quality of adhesion of the glued stones to carrier materials. It enables you to easily and quickly assess whether the glued joint is strong enough, reaching the required level of strength. The test is to be run on the correct side of the carrier material.
Following the recommended procedure, glue one or more stones onto the tested carrier material. After the adhesive has set, try to peel the stone off the carrier material, using a sharp flat plastic tool (see the sketch below). Assessing subjectively the force necessary to peel the stone off, you can judge whether the joint is strong enough to stand up to normal wear. If the stone comes off in spite of relatively weak force exerted on it, or if the carrier material becomes damaged due to aggressive chemical action of the setting adhesive on the carrier material, the test proved that the adhesive used was unsuitable and cannot be recommended.
Always bear in mind that this test is to be run after the adhesive has set completely. Shortened setting times may negatively influence the achieved result.
Maintenance of Textile Materials with Glued-on Fashion Jewellery Stones
These materials are, for the most part, very sensitive to maintenance techniques and, therefore, require gentle handling.
Recommended cleaning techniques
If washing is necessary, it is strongly recommended that the garments and fabrics with glued-on stones should only be washed by hand, using lukewarm water with a minimum amount of mild detergent (any washing agents designed for fine fabrics). To dry the washed garments, do not wring them, but roll them up in a towel, pressing them gently several times. Then lay them on an absorbent pad, letting them dry slowly, as one would with
a woolen sweater.
Alternative maintenance procedures are only possible after a satisfactory test result has been achieved, using a proof sample.
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