In the automotive industry, trunks are of major significance. Not only are they helplful for transporting groceries, baggage and other items, trunks are also a car compartment where weight reduction plays an essential role.
- Laminating adhesives for car trunks
- Diverse applications
- Different material combinations
Jowat adhesives for the lamination of diverse materials for car trunks
To meet the requirements for a lightweight construction, modern trunk floors are increasingly manufactured from a honeycomb board foamed with polyurethane (PU). Compared to the wood-based materials used in the past, these boards weigh less and are extremely stable.
The weight of the boards is reduced to a minimum due to the cardboard honeycomb structure which forms the inner core of these boards. In the next step, the honeycomb is covered on top and bottom with glass fibre mats and foamed with PU (GMPU). In this process step, separating agents may be used to ensure that the boards can be removed easily from the moulds after the foaming process. These separating agents may lead to bonding failures when the board is laminated with the surface material, generally carpets made from polyester (PES). In some cases, the boards may be sanded to improve adhesive wetting. The application methods used by processors are very diverse. The adhesive can be sprayed on the carrier substrate, or alternatively be applied by slot nozzle, by roller or by spraying on the carpet.
The lamination process usually takes place offline. Therefore, the adhesive will be reactivated later when the carrier substrate is laminated with the surface layer. The two substrates are laminated by pressing and the edgefolding is carried out in the same press or later in a separate edgefolding unit. Edgefolding applications need adhesives with high green strength, comparable to the high requirements of elaborate parcel shelves.
Parcel shelves may also consist of laminated GMPU boards. Compared to trunk floors, they are laminated however with a PES textile on the top and a PES nonwoven on the underside. The lamination processes are similar to each other and the adhesive is generally applied by roller.
runk cover systems are also laminated. The retractable cover box is wrapped with a PVC foil, and the handle is laminated on the top and on the underside with a PVC foil. Jowatherm-Reaktant® adhesives are also used in this application and reactivated later for bonding.