 Polyester film for thermal lamination |
| OF THE INVENTION The polyester A in the present invention must have ethylene terephthalate and/or ... |
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| Heat-sealable polyester film |
| What is claimed is: 1. A coextruded heat-sealable polyester film having at least one polyester base ... |
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| Sealable polyester film with high oxygen barrier, its use and process for its production |
| What is claimed is: 1. A sealable, biaxially oriented polyester film comprising: a base layer B, at ... |
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| Article comprising a passive optical waveguide |
| In a broad sense, the invention is an article which comprises a polymeric waveguiding film mounted ... |
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| Resin laminate containing syndiotactic styrene-based polymer |
| What is claimed is: 1. A resin laminate comprising two biaxially stretched layers of a styrene-... |
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| Hologram with integral printed indicia |
| OF THE FIGURES FIG. 1 shows a card 10, e.g., of a type similar to a common credit card, having ... |
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| Modified copolyesters and improved multilayer reflective films |
| Generally, the present invention relates to a multilayered polymer film. One embodiment is a ... |
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Method of manufacturing columnar shaped piece
| Details |
Inventors: Hentschel, Martin;
Assignee: Real GmbH (Mainbernheim, DE)
Primary Examiner: Thurlow; Jeffery
Assistant Examiner:
Attorney, Agent or Firm: Sprung Horn Kramer & Woods
A method of manufacturing a columnar shaped piece formed of a thermoplastic matrix with ancillary pieces of a non-creeping hard material embedded therein and cemented by the plastic matrix. The ancillary pieces are essentially overlapping slabs which are substantially parallel to one another and the axis of the columnar shaped piece. Molten thermoplastic blended with solid slabs is extruded in the form of a billet into one end of an elongate mold and rotated around the inner surface of the mold. The extrusion continues until the inner surface is uniformly covered with constituents of the billet. |
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DETAILED DESCRIPTION A principal object of the present invention is to provide a columnar shaped piece that differs from the known piece of this type due to its improved mechanical properties and especially to its improved bending resistance.
A further object of the present invention is to develop a method of manufacturing which produces columnar shaped pieces with definitely improved strength.
These objects, as well as other objects which will become apparent in the discussion that follows, are achieved, in accordance with the present invention, in that the ancillary pieces are essentially overlapping plates or "slabs" and essentially parallel with one another and the longitudinal axis of the columnar shaped piece.
This design definitely reduces the tendency of the thermoplastic material that constitutes the matrix to creep subject to long-term stress and allows the columnar piece to be employed as a structural element.
It has been demonstrated especially practical for the slabs to be essentially the same size longitudinally and transversely.
This feature will help ensure that the slabs overlap like roofing tiles along and around the columnar piece.
All mechanical properties, especially bending resistance, resistance to compression, and resistance to buckling will be definitely improved along and around the piece.
The slabs should if at all possible be 0.
2 to 0.
4 as thick as they are long and wide.
This feature will help ensure orientation of the slabs parallel to one another and to the axis of the piece while it is being manufactured by extruding a blend.
The slabs can be duroplastic, preferably reinforced with fiber.
Materials of this nature are widely employed in the manufacture of automobile bodies in the form of extensive surfaces.
It has up to now been impossible to recycle them and they are accordingly cheap and plentiful.
They can easily be broken down into slabs of the size needed for the present application with mechanical breakers or screen mills.
The process is accompanied by the advantage that the edge of the resulting slabs is irregular, so that the ends of any fibers included therein will extend beyond it
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Nonmetallic Processes 
