FASTENERS AND JOINING/SEALING/SEPARATING 39
Self-adhesive spacer tapes help bonding of slim mobile phones
Christina Barg-Becker looks at bonding technology being used in slim phones.
of its electronic parts new designs play a decisive role. Due to this development the connecting components
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in such devices must meet many new different challenges. This includes, for example, the trend towards thinner products, like so-called slim phones, which is continuing today, and calls for an innovative bonding technology. Double-sided pressure sensitive spacer tapes as die-cuts are an adequate new solution because they meet the various requirements of this special industry.
obile phones these days are not just a multi-media communication tool, they also represent status and excellent taste. Next to the increasing complexity
dust protection of display and microphone, fixation of flexible antenna, heat management and EMI Shields. But even apparently simple die-cuts, such as the protective film for mobile phone displays, require utmost care with regard to contamination with even the smallest dirt particles. This means they have to be produced in a clean-room. In a cleanroom the cleanliness of the air is achieved by sophisticated high-volume HVAC systems with multiple step filters (positive pressure ventilation), by appropriate clean room garments and by closely monitored working procedures. Precision die-cuts in the micron range feature a multitude of design advantages. They are not only available in virtually any conceivable shape and size, they also offer ease of assembly, greater process flexibility and secure high volume production. Die-cuts separate and protect different material layers and achieve corrosion-free joints without screws or rivets.
Concerning the special
Fig. 1. Meeting the latest bonding challenges, high-adhesion DuploColl spacer tape helps reduce weight and save space in slim mobile phones.
Die-cuts consisting of single and double-sided pressure-sensitive-adhesive tapes, with laminates or special foams, membranes and films are used in many industries. For example, for medical applications, as diagnostics or for the electronic-, automotive- and mobile communication industry. Lohmann, with its die-cutting competence centre and
long lasting experience in creating customised adhesive tapes, has a solution. A wide range of different pressure sensitive adhesive applications are being used in a mobile phone. For example, fixation of the icon or front plate,
mobile communication industry nowadays, the market activities are focused on Asia. In close collaboration with the German headquarters Lohmann’s subsidiary in China is continuously creating new customised
solutions locally. The latest result is a new product range for slim mobile phones. With the customised DuploCOLL spacer tapes the company has created a new range of high-tech die-cuts to fit process-designed- specifications. They not only fulfill the requirements of reducing weight and space but also meet further challenges. For example, despite the smaller bonding areas, the die-cuts have to perform in their usual way. This means, for example, a high adhesion for permanent fixings, high resistance to plasticisers or a secure bond at elevated temperatures. By using DuploCOLL spacer tapes, the number of bonding components in a mobile phone is reduced and the total thickness of the construction is decreased. And this means an absolute advantage for the customer, allowing more freedom of design.
Looking at the cross
Fig. 2. This cross-section shows the traditional; method of bonding components in mobile telephones.
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section of a conventional mobile phone in short, it is
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