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09-22-2015

Delta PT Screws

Perfect for Lightweight Parts

Fig. 1: The Delta PT P is a very lightweight plastic screw for threading directly into soft thermoplastics (figure: Ejot)

Ejot GmbH & Co. KG, Bad Berleburg, Germany, is focusing on joining elements for lightweight parts. Several of these elements will be demonstrated in action at the trade fair. For instance, the Delta PT is a steel screw that can be screwed directly into thermoplastics. Thanks to this capability, it contributes to weight savings, since the Delta PT is smaller than other such screws or the number of screwed joints can be reduced. The aluminum version of the Delta PT offers a weight savings of up to 60 %. The plastic screw, which is suitable for use in soft thermoplastics, offers a weight savings as high as 85 % (Fig. 1). According to Ejot, these lightweight screws offer joining capabilities comparable to those of the steel screws.

Modern, lightweight materials such as honeycomb and foam-core structures with different skin layers as well as CFP and GFP materials are used frequently in the automotive industry in particular. With the TSSD ("thermal adhesive bonding boss"), Ejot has developed a fastening element and associated joining method that can be used in applications where one of the parts is a fiber-reinforced plastic. During the joining process, the plastic element is threaded into the plastic part. The TSSD (Fig. 2) can function as a boss for the Delta PT screw and as a standalone fastening element.

Fig. 2: Using the TSSD thermoplastic boss, both honeycomb and foam-core structures as well as fiber-reinforced plastic parts can be joined (figure: Ejot)

EPP (expanded polypropylene) parts are also frequently used as another variant for lightweight designs. For fastening components to such foam parts, Ejot used the "EPPsys" (EPP system). This plastic screw can be threaded directly into the foam without the need for a pilot hole. The EPPsys DR (Direktverschraubung = direct assembly / Rasthaken = snap fit) is a variant of these screws where two snap fits permit fastening of thin-walled parts to the EPPsys element. The EPPsys RSD (Reib-Schweiß-Dom = friction welding boss) is attached by means of friction welding and bonds directly to the melted material, is an especially effective element. The EPPsys RSD is also suitable for subsequent direct assembly using the Delta PT screw.

Fakuma Hall B3, booth 3114

contact
Company profile

EJOT GmbH & Co. KG

Im Herrengarten 1
DE 57319 Bad Berleburg
Tel.: 02751 529-0
Fax: 02751 529-559

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