DE875917C - Process for the production of transparent or pigmented material for lighting purposes and the like like - Google Patents

Description

Process for the production of transparent or pigmented material for lighting purposes and the like. In addition to glasses of all kinds, alabaster, parchment, silk, Plastic, etc., a wide variety of transparent materials are known for production of lampshades, banners, for decorative and advertising purposes, etc., for example oil-treated or paraffinized paper and cardboard, matted or colored cellulose acetate, Celluloid, thermoplastics, etc. Most of these materials are called single-layer, flat-rolled, smooth or the relevant trade in format sheets or delivered in rolls. The majority of them have certain disadvantages, e.g. B. little high bending and buckling capacity with sufficient dimensional stability or vice versa Insufficient stability of the form with sufficient flexural strength and buckling strength. All Such materials usually require intensive processing from especially to be prepared items on wire racks, etc. the subject of the invention The underlying method is a material structure of at least two in a suitable Way pretreated, impregnable cellulose layers, some of which are smooth State, partly in a special deformation, e.g. B. by pre-stamping or twisting, with the help of the well-known hot bonding process on the basis of both sides applied Polyvinyl acetate-based plastic films hot ironed, rolled or pressed together be, but by appropriate pressure limitation, the by the pre-embossing or Twisting at least one layer obtained, irregular bumps as dimensionally stable cavities are retained.

In this way new properties can be obtained, their essential characteristics Completely unbreakable with increased flexibility despite improved and resiliently reinforced dimensional stability, absolute security against kinking, leather-like Tensile strength and depending on the previous transparency or pigmentation have excellent diffusion or reflection.

The procedure leaves. both in the simplest manual mode and apply in practice in mechanical or fully automatic flow production. Manufacturing accordingly supplies the plan material either in format sheets or production rolls.

Claims (2)

PATENT CLAIMS: e.g. Process for the production of depending on the pretreatment the base material is highly transparent, diffuse or reflective material, e.g. B. for lampshades, by manually or mechanically performed hot bonding of at least two layers of appropriately pretreated, impregnable paper or cardboard boxes, characterized in that at least one layer is preformed, e.g. B. is twisted; so that in the case of hot bonding under limited pressure form small, irregularly extending cavities. 2. The method according to claim z, characterized in that pigmented or printed starting materials are used will.