A sandwich structure includes two cover layers and a core arranged therebetween, and at least one connecting element for connection to further components. The connecting element has an insert, which is embedded into the sandwich structure at a cover layer of the two cover layers. An embedding depth of the insert is less than a thickness of the core. The connecting element is finished flush with an outer side of the cover layer via which the connecting element is embedded or protrudes from the cover layer.

The invention relates to methods to thermally treat wood (e.g., flat-grain timber) to produce wood with enhanced color and/or weathering properties.

A fire retardant article has a wood-based material with a polyisocyanurate foam article attached thereto, where the polyisocyanurate foam article covers 90% or more of the exposed portion of the wood-based material, has a thickness greater than 1.8 centimeters, a foam core having a density of 28-128 kg/m.sup.3, a trimer concentration characterized by at least one of (i) a trimer level in a range of 12-25 weight-percent and (ii) a molar ratio of trimer to sum of urethane and urea in a range of 1-8, a phosphorous concentration of at least 0.3 wt %, a combined concentration of phosphorous and bromine of at least 0.5 wt %, and a vapor permeable and non-combustible facer on at least one primary surface of the foam core.

A process for making a card includes the steps of forming a core layer having a first surface and a second surface, disposing an uncured decorative ceramic layer of ceramic particles disposed in a resin binder over the first surface of the core layer, such as by spray coating, and curing the uncured decorative ceramic layer to form a cured decorative ceramic layer. Card products of the process may have a core layer of metal, ceramic, or a combination thereof that form a bulk of the card.

A process for making a card includes the steps of forming a core layer having a first surface and a second surface, disposing an uncured decorative ceramic layer of ceramic particles disposed in a resin binder over the first surface of the core layer, such as by spray coating, and curing the uncured decorative ceramic layer to form a cured decorative ceramic layer. Card products of the process may have a core layer of metal, ceramic, or a combination thereof that form a bulk of the card.

Cards made in accordance with the invention include a specially treated thin decorative layer attached to a thick core layer of metal or ceramic material, where the thin decorative layer is designed to provide selected color(s) and/or selected texture(s) to a surface of the metal cards. Decorative layers for use in practicing the invention include: (a) an anodized metal layer; or (b) a layer of material derived from plant or animal matter (e.g., wood, leather); or (c) an assortment of aggregate binder material (e.g., cement, mortar, epoxies) mixed with laser reactive materials (e.g., finely divided carbon); or (d) a ceramic layer; and (e) a layer of crystal fabric material. The cards may be dual interface smart cards which can be read in a contactless manner and/or via contacts.

Cards made in accordance with the invention include a specially treated thin decorative layer attached to a thick core layer of metal or ceramic material, where the thin decorative layer is designed to provide selected color(s) and/or selected texture(s) to a surface of the metal cards. Decorative layers for use in practicing the invention include: (a) an anodized metal layer; or (b) a layer of material derived from plant or animal matter (e.g., wood, leather); or (c) an assortment of aggregate binder material (e.g., cement, mortar, epoxies) mixed with laser reactive materials (e.g., finely divided carbon); or (d) a ceramic layer; and (e) a layer of crystal fabric material. The cards may be dual interface smart cards which can be read in a contactless manner and/or via contacts.

A core layer is provided which is suitable for a multilayer composite that includes at least one cover layer and the core layer. The cover layer is arranged so as to at least partially cover the core layer and be fixedly connected thereto. The multilayer composite includes the core layer, the core layer having layers which have corrugated wooden elements. The corrugated wooden elements are arranged in an oriented manner in at least one layer.

A core layer is provided which is suitable for a multilayer composite that includes at least one cover layer and the core layer. The cover layer is arranged so as to at least partially cover the core layer and be fixedly connected thereto. The multilayer composite includes the core layer, the core layer having layers which have corrugated wooden elements. The corrugated wooden elements are arranged in an oriented manner in at least one layer.

The disclosure proposes a fibreboard made of lignocellulose-containing fibres, in particular wood fibres and a binding agent for providing a fibreboard which enables to combine a high stability, on the one hand, and a comparatively small weight, on the other hand, and which can nevertheless be manufactured with a minor financial effort.