Heat shrink sheath e.g. for telephone cable splice - consists of crosslinked polymer with gas and water vapour barrier plastics film not impeding shrinking
Номер патента: DE4200250A1
Опубликовано: 15-07-1993
Автор(ы): Karl-Heinz Marx
Принадлежит: Kabelmetal Electro GmbH
Опубликовано: 15-07-1993
Автор(ы): Karl-Heinz Marx
Принадлежит: Kabelmetal Electro GmbH
Реферат: Heat-shrink sheath for substrates, e.g. telephone cable splices, consists of a first layer of crosslinked polymer (I) and a second layer of gas- and vapour-impermeable material (II). The novel features are that (a) (II) consists of a plastically or elastically deformable plastics film with a wall thickness of 10-250, pref. 25-100 microns; and (b) the sheath has a water vapour permeability (WVP) of max. 0.03 g/m2 day. The sheath has a hot melt adhesive layer (III) on one surface and (II) is between (I) and (III). (II) consists of PVA, EVA, polyacrylonitrile, PVDC or PVDF; and (I) of polyethylene with embedded flakes of polyamide. ADVANTAGE - The water vapour barrier does not impede shrinkage and the sheath can be made economically. In an example, (I) was made from a mixt. of 50 pts. polyethylene, 40 pts. EVA and 10 pts. C black, which was treated with 1% vinylmethoxysilane and extruded to a tape with ca. 4 mm wall thickness. The tape was covered with a PVA film (ca. 200 microns thick) and crosslinked in steam at ca. 95 deg.C, avoiding the use of harmful radiation. The crosslinked prod. was drawn by 300-500% at 150-180 deg.C and cooled in the drawn state. The wall thickness was then just over 1 mm. After applying (III), the prod. was ready for use. The PVA film reduced the WVP considerably.
Composite adhesive tape comprising two double-sided adhesive strips connected by a removable spacer, used for masking parts of a surface while painting other parts, e.g. for painting stripes on cars
Номер патента: FR2850974A1. Автор: Reic Marc Ganci. Владелец: Reic Marc Ganci. Дата публикации: 2004-08-13.