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APPLICATION TECHNOLOGY

Keeping the noise down M

3M has highlighted the role that can be played by specialist sound damping tapes in reducing noise from vibration in industrial environments.

achinery vibration is a significant source of noise, and legislation requires employers to take all possible action to reduce the amount of noise below clearly defined legal thresholds as part of engineering controls before the use of personal protective equipment is considered. 3M believes that modern aluminium foil sound damping tapes can help towards meeting

the increasing demand for noise reduction on equipment such as compressors, HVAC and production machinery. Furthermore, by decreasing vibration, they can also help reduce wear on equipment. 3M Vibration Damping Tapes are pressure-sensitive and the linered construction of the product

allows it to be die cut, maximising ease of application. Gareth Evans, technical service specialist for 3M’s industrial adhesives & tapes division, commented:

“Modern sound damping tapes are highly effective in reducing vibration and therefore noise. They also help eliminate fatigue cracks due to skin or panel vibration. They were originally developed for highly demanding applications in sectors such as aerospace, meaning they are able to operate effectively in extremes of temperature and in the presence of chemicals such as solvents and hydraulic fluids.” He adds: “Where a very significant reduction in vibration – and therefore noise - is required, the tape can be applied in multiple layers for enhanced damping.”

ITW Plexus in the frame T

his was a new bonding application for the 73 year old company and it presented Plexus with a tough list of requirements. High strength was necessary but with

good flexibility. The adhesive also needed to have excellent fatigue resistance as well as the ability to withstand stress. Casalini also wanted to minimise processing times which meant they needed an adhesive with shorter working and fixture times, as well as one capable of bonding substrates with little or no surface preparation. Finally the adhesive had to present no health and safety issues. Plexus rose to the challenge and after in-depth

discussions and meetings on site with the client, put forward a special methacrylate adhesive MA 422. Tests both in the laboratory and in the customer’s process confirmed that the adhesive met all these rigorous requirements. The adhesive

Casalini, the Italian light vehicle manufacturer is now using a special methacrylate adhesive from ITW Plexus to bond a steel reinforcing frame to the GRP cabin interiors of its new M10 micro car, Kerry MPV and Pickup truck.

is now supplied to Casalini in cartridges and is machine-applied to the cabin wall. The frame is then positioned in place and held there while the adhesive - which has excellent gap-filling properties - rapidly sets, giving increased strength and safety to the cabin. Casalini’s production manager Mr Fermi

explained: “Originally we were using a two component PU adhesive but after talking with Plexus and its local distributor Vaber we learned that MA 422 methacrylate adhesive would work much faster for us, increasing throughput and reducing our manufacturing costs. Our material costs were also reduced by using an adhesive dispenser. The technical advice and assistance given to us by both Plexus and Vaber throughout the production trials and since that time has been exceptional.”

DIRAK introduces Concealed Hinge

DIRAK has expanded its line of hinges to include the 4-393 Concealed Hinge Pr02 120º designed specifically for nested door applications.

T

he 4-393 Concealed Hinge Pr02 120º does not require installation hardware for mounting. A simple clip- in process requires only one hole cut-out in the door and one hole cut-out in the frame through which the hinge slides for a secure fit. DIRAK points out that the cabinet door can be easily removed by pulling on one of the internal, spring-

loaded, retractable pins. The door is then easily lifted off the frame for access into the cabinet. Since there is no need for mounting hardware there is no concern for loose or missing hardware when the door is unhinged. To re- attach the door the user simply needs to pull on the retractable pin, place the second hinge pin in the hole cut-out in the frame, slide the door in place and release the pin. The door is then properly mounted. When the door is closed, the hinge is completely concealed within the interior of the cabinet application providing

a clean external appearance. The 120° opening angle allows for easy access to the interior of the application. “The 4-393 Concealed Hinge Pr02 120º is compact and ideal for applications where space is limited. It can be

used on both left and right hand door applications. This results in lower inventory (reducing the number of parts needed), reduced production complexity, and less chance of installation errors, which often lead to costly mistakes.”

114 Fastener + Fixing Magazine • Issue 68 March 2011

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