Jowat Magazine 2014-01 EN

09 mallest surfaces The International Data Corporation (IDC) is predicting an export rate for China in 2014 of around 450 million smartphones. In 2013, sales ﬁgures already reached 360 million. assembly of all these devices requires adhesives. Editor: And what exactly is bonded on a smartphone with Jowat adhesives? Karsunke: First of all the display. Our adhesive is applied here onto a very small surface by a specialized application system which works like a Editor: The display is an essential component of a smartphone. It is per- ceived by the user as combination of design and function. What challenge does this represent for an adhesive? Karsunke: The end user has high demands on the workmanship of a mobile phone. This represents dura- bility and stability of the device. Since the display is what the user has in view to perfection. The manufacture is therefore subject to the most stringent quality criteria. Optoelectronic error detection systems immediately sort out units with minute non-compliances. manually, already in the manufacture, so that the usually expensive display will not end up as waste. A very crucial property of our adhesive is: the long open time during which the adequate green strength is maintained. Editor: Is this how we can imagine the process: An error detection system spots a display which is not applied correctly and sorts it out. A staff member corrects the error, and the mobile phone then goes back on the production line? Karsunke: Yes, this correction was a major criterion for selecting the Jowat hot melt adhesive. It provides the required green strength with the necessary open time for possible corrections. Apart from this, the low viscosity of this hot melt allows pro- cessing at relatively low temperatures, resulting in a limited stress on the ma- terials used. Editor: Viscosity is a measure of the resistance of an adhesive to defor- mation by shear or tensile stress. The higher this property, the higher the viscosity. Why was this product quality important? Karsunke: Before using our Jowatherm-Reaktant® adhesive, the manufacturer was working with a two-component system. These two- component systems are liquid at room temperature (low viscosity) and can

Jowat Magazine 2014-01 EN

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