Piston-, rod guide elements of fabric-based laminates

Guide rings of fabric-based laminates (fabric composites) are used for pistons and rods serving to prevent mechanical contact between the moving components and absorbing any side loads that occur.

As guide rings they are used predominantly in heavy-duty hydraulic cylinders.

Depending on the materials selected for the fabric-based laminates, certain combinations can offer excellent friction behavior, outstanding wear properties, stick-slip-free operation and extremely high load-bearing capacities as well as exceptional elasticity and good media resistance.

Rings of fabric-based laminates are manufactured from tubing and feature a preload especially aligned to the piston and/or rod. They are supplied ready to fit to the piston or rod.

The profile is rectangular with beveled or rounded edges in order to prevent impermissible edge compression at the groove corners and to facilitate installation in the groove.

The guide rings are supplied ready to fit with a diagonal cut of 45°. A stepped Z-cut and also a straight 90° cut can also be provided if required. The gap necessary to ensure reliable function has already been taken into account in the manufacture of the rings. This gap is necessary in order to avoid undesirable pressure build-up and to compensate for band/ring elongation.

Individual dimensional ranges can also be manufactured in slotted designs, as closed, continuous designs or as bushings.

Benefits

• Very high compressive strength
• High side load absorption capacity
• Minimal friction and wear
• Good sliding and emergency running properties
• High service lifetimes, extremely abrasion-resistant
• Good chemical resistance
• Foreign particle embedding capability
• Easy fitting by snapping into the groove

Applications

Compressive strength depends on material combination

Material

KT-100 is a phenolic resin laminated fabric made up of impregnated cotton fabric made up of impregnated cotton fabric webs.
Static compressive strength vertical to the layered structure: 270 N/mm2

KT-107 is a phenolic resin laminated fabric made up of impregnated cotton fabric webs, additional lubricate graphite.
Static compressive strength vertical to the layered structure: 300 N/mm2

KT-200, KT-200T, is a phenolic resin-bonded artificial fibre laminated fabric with embedded PTFE. This material exhibits very high load-bearing capacity, outstanding sliding properties and is characterized by its extremely high resilience. The material undergoes no swelling, and water absorption is very low. The KT-200T as stock lenght, is pressed of plate material.
Static compressive strength vertical to the layered structure: 330 N/mm2; KT-200T  320 N/mm2

KT-200B, is a epoxy resin-bonded polyester fibre laminated fabric. This material exhibits high load-bearing capacity, outstanding sliding properties and is characterized by its extremely high resilience. The material undergoes no swelling, and water absorption is  negligible. This type of material is available very fast, in small quantity.

Static compressive strength vertical to the layered structure: 310 N/mm2;

KT-700, KT700T it´s a combination of aramid fabric and a high temp. modif. phenolic resin, with additional lubrication graphite. This material exhibits very high load-bearing capacity and a high temperature range. This material is also available in stock length.
Static compressive strength vertical to the layered structure: 350 N/mm2; KT-700T  350 N/mm2

KT-500T, KT500TS is a combination of polyester and polyester resin, additional lubrication graphite or PTFE. This fabric-based laminate exhibits high load-bearing capacity, high wear resistance and is characterized by very good elastic properties. This material is available both as spiral version in different diameters or as stock lenght.
Static compressive strength vertical to the layered structure: 340 N/mm2