Sealing & Acoustic Solutions

Automotive

FVCML0208 10

Sealing & Acoustic Solutions - Part 1

Customer solutions

L&L Products is the industry leader in the formulation of innovative, high performance sealing solutions. Our three-dimensional molded or extruded parts are installed in the body shop. Upon heating to the e-coat curing temperature, the material expands to close the cavity. Their primary purpose is to provide a barrier against water, dust and noise.

Key Attributes Good sealing relies on many factors. We offer a complete line of sealants of customizable shapes, sizes and forms. In the curing oven of the OEM’s e-coat process, they will expand at different rates and volumes to fill hollow cavities. Expansion ranges from 0% to 2000%. We offer materials with differents densities and cell structures depending on body-in-white and closure applications, such as sealing, sound absorption and dampening.
Baffles Typical applications include body pillar cavities, such as roof side rails and rocker panels. The expandable material is die-cut or injection-molded and assembled onto a carrier (nylon, steel and more). The “race track” or “sandwich” baffle obtained is clipped or welded in the body shop.
Stick-on tapes This is a self-supporting easy to apply baffle concept. The material base contains the expandable formulation and adhesive. The expansion rate exceeds 1000%. Assembly is fast and easy thanks to a meltable film over the part. Our tapes have excellent adhesion on any body substrate: steel, aluminum, magnesium, and even oily panels.
Carrierless sealing L&L Products developped a cost effective solution for cavity sealing; our chemists have developed an innovative material that expands up to 2000% with good acoustic properties. An integrated carrier allows shaping and fixing the material to fit most pillar sections. This patented technology provides for multiple applications with a single design. L&L Products can supply prototypes in as little as 24 hours.

Sealing & Acoustic Solutions - Part 2

Customer solutions

eXtrude In Place XIP marries the robustness of the material technology developed by L&L Products and the capability of being a fully automated process. The material is applied directly and precisely onto the metal substrates by a robotized extruder. The result is little to no waste and no tooling required. The material is dry to touch immediately after application. To optimize the logistic flow, we can design and install an XIP system that would be customized to fit in the logistic flow between the stamper and the OEM.
Versatile sealing technology This ability to apply materials acurately and precisely to the right location coupled with custom formulated chemical components make XIP a versatile sealing technology. Water, air leakage and vapor intrusion into vehicle compartments can be eliminated with the use of expandable sealant. Current applications include fuel filler, hinge pocket, rear lamp and pillar closures.
Acoustics improvement Applied to door beams or roof bows, XIP technology drastically improves the acoustics by damping vibration. The expandable material features damping properties and ties all the individual components together. The XIP application of the material directly on the substrate makes it a cost effective and high performance solution.
Sound Management L&L Products provides outstanding acoustic solutions. Our material scientists have formulated foams with noise absorption capabilities and we developed a CAE methodology to design the best combination of material and carrier design.
Noise absorption Our company has elaborated innovative materials with absorption coefficient alpha(0°) up to 70%. A standard sealing material reaches only 20%. We collect a full range of data to characterize our materials: damping ability dynamical rigidity transmission loss air flow resistivity porosity. And all Biot parameters for open cells foams.
Virtual development CAE simulation allows further optimization of acoustic performance of our baffles. Various geometries (i.e. race track, sandwich, layer), different carrier materials and different thicknesses are simulated easily using acoustic softwares. Design rules have been built according to each customer specification to achieve optimal designs.