Product Information

Laminated Rubber Isolator Made of Natural Rubber Compound

Laminated Rubber Isolator Made of Natural Rubber Compound

Kurashiki Laminated Rubber Isolator Absorbing Seismic Vibrations

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Structure of Laminated Rubber

This laminated rubber isolator is an important product which has the role of reducing the transmission of seismic forces in buildings by supporting the building load and flexibly transforming its shape in the horizontal direction during an earthquake.
This isolator is formed using dies by setting rubber and metal sheets alternatively. Various inspections have been conducted in critical manufacturing processes to assure the quality of the products.

Product Performance

Superiority of Intermediate Sheet Exposure Type

The Kurashiki laminated rubber isolator is an intermediate sheet exposure type isolator, with the intermediate sheet metal being exposed on the lateral side. Furthermore, it has no central holes, therefore, it exhibits stable performance under high surface pressure situations.

Rigid Structure without Central Holes

Kurashiki laminated rubber isolator has a reinforced structure without central holes.
Unique technology developed by Kurashiki Kako has made possible the production of laminated rubber isolators which do not require central holes.
The laminated rubber isolator without a central hole has a rigid axis and demonstrates excellent performance under high surface pressure circumstances. Due to this, a stable restorative capability can be maintained. This allows for less buckling in a structure even when the laminated rubber is severely deformed.

Highly Reliable Product using High-purity Natural Rubber

The high-purity natural rubber used in Kurashiki laminated isolators is imported only from designated rubber plantations after going through a stringent inspection processes of the quality raw rubber.

Specifications by Series

In order to stretch the oscillation cycle of seismically isolated buildings, the following two methods can be performed: (1) Lower the spring constant of laminated rubber, and (2) Increase the load applied to the laminated rubber, in other words, raise the surface pressure of the laminated rubber. Provided however, the surface pressure of laminated rubber cannot be raised limitlessly. Kurashiki Kako has prepared laminated rubber in four different spring constants; NB40 and NB45 series for high surface pressure and NB30 and NB35 series for lower elasticity, to stretch the oscillation cycle of buildings.

Low Elasticity Series

  • NB30 series: G0.29
  • NB35 series: G0.34

High Surface Pressure Series

  • NB40 series: G0.39
  • NB45 series: G0.44