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April 23, 2018 - Aerospace Bostik News

Why Web Adhesives for Skin to Core Composites are the Smart Choice

Skin to core composites are used in many aircraft interior applications, such as overhead bins, galley walls and ceiling panels. Delivering mechanical strength, dimensional stability and low heat release, these structures are also lightweight and help manufacturers meet weight reduction requirements.

Adhesives are used in assembling skin to core composite structures, which are comprised of face sheets on either side of a honeycomb or foam core. Yet while many options exist for skin to core composite bonding, web adhesives offer distinct advantages.

Gain insight into what these advantages are and why web adhesives are the smart choice to make for skin to core composites. skin to core composites

  1. Enhanced Manufacturing Flexibility

Web adhesives are thermoplastic solutions, which means they can be re-heated and re-melted if need be during assembly. This capability gives manufacturers additional application flexibility, as they can make changes to the process using existing materials instead of starting over and being forced to scrap materials.

Additionally, web adhesives offer versatile bonding capabilities, with good adhesion to a wide range of core and prepreg materials, including epoxy.

  1. Increased Variety of Activation Temperatures

Web adhesives are available in a wide variety of activation temperatures, ranging from 88°C to 177°C (190.4°F to 350.6°F). This offers manufacturing advantages because foam and honeycomb core materials can be sensitive to temperature. Many adhesives require high temperatures to cure, which can damage the core material. This is not an issue when using web adhesives for skin to core composites, and the core does not get damaged.

  1. Streamlined Application Processes

When applying liquid adhesives, it can be difficult to achieve a uniform bond line, which can affect the strength of the sandwich part.  Additionally, on porous substrates, the adhesive may require multiple coats for good adhesion, which slows down the manufacturing process.

Web adhesives, on the other hand, offer strong adhesion in just one application step. The design of the webs allows them to melt away from gaps in the core material, instead providing uniform adhesion in places where the core material meets the face sheet. This allows manufacturers to use a lower relative coat weight without sacrificing adhesive strength.

  1. Improved Sustainability

In addition to streamlined processes, web adhesives reduce adhesive consumption and decrease the amount of production waste. Furthermore, as 100% solid, solvent-free solutions, they don’t release any toxic chemicals during application and improve worker safety. By offering environmentally friendly processing, web adhesives help improve in plants’ sustainability efforts overall.

For more information on how Bostik’s web adhesives are ideal for skin to core composites, call 800-7-BOSTIK, or click here to contact us.

 

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