Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Patent
1996-01-26
1998-03-24
Buffalow, E. Rollins
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
4273741, 428245, 428339, 428364, 428500, 526352, 526 73, 264462, 264 25, B32B 702
Patent
active
057310726
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a continuous process for producing a strip of decorated material for applying to a ski made of ultra-high molecular weight polyethylene.
STATE OF THE ART
It is known to provide ski parts and ski-coating materials made of polyethylene with a decoration according to the process of screen printing. Thereby, the screen printed color is molded onto the ski-coating material through a pattern fabric, which has color-permeable zones as well as color-impermeable zones in accordance with the desired decoration pattern. Thereafter, the leftover dye parts are removed with a blade.
It is now required of a decorated ski-coating material according to the process, that the screen printed colors be also well in view on the backside of the coating material which faces the snow and thereby also facing the observer, because the bonding with the rest of the ski parts is performed on the printed side. However, it has been shown that the color intensity of the decoration is negatively influenced by the milk-white appearance of the polyethylene so that the decoration is not clearly visible to the observer.
Furthermore, it is known from AT-PS 362 691 to provide the surface of a ski with a decoration made of plastic through the process of press transfer. Thereby, the thermodiffusion colors are applied like paper on an intermediate carrier and the plastic is pressed hot thereon, whereby the colors go into the gaseous or melting phase and penetrate into the plastic. This process could be applied also to the decoration of ski coatings; however, this is insofar costly since high demands like high dimension stability and good stamping work characteristics are required of the intermediate carrier as well as surface characteristics which prevent the extended penetration of the pressing color into the papers printed with thermodiffusion dyes, so that a high output of dye on the printed plastic is obtained. Further, the intermediate carriers must be affixed onto the printed plastic as well as the ski coating in further process steps and must be removed after stamping. After their use, the intermediate carriers must be discarded since they cannot be used again in a further process step.
Besides the requirements for the decoration as well as for its manufacture on the ski coating, the coating must also show the needed physical properties such as a high resistance to wear by friction as well as a good absorption for wax. From WO-A1-93/05853 it is known, that the resistance to wear by friction of the ski-coating material can be determined through the molecular weight of the polyethylene, so that the use of ultra-high molecular weight polyethylene becomes necessary.
Since the wax absorption depends from the thickness of the UHWPE, and therefore from the crystalline portion in the ultra-high molecular weight polyethylene, the polyethylene is set through targeted crystallization to the highest wax absorption according with the process of WO-A1-93/05853.
DESCRIPTION OF THE INVENTION
The object of the invention is, therefore, to provide a color intensive decoration on a ski-coating material made of ultra-high molecular weight polyethylene in a easy realizable process, whereby the decorated ski-coating material has a high wax absorption as well as a good resistance to wear by friction.
According to the invention, it is suggested here to produce a strip of ski-coating material made of ultra-high molecular weight polyethylene and to provide the same with a decoration in such a manner that a strip of ski-coating material made by screw-type extrusion, piston-type extrusion or sintering followed by peeling and with a thickness of approximately 0.5 to 1.5 mm is later printed with a thermodiffusion dye and runs continuously through a heating zone in which it is heated to a even temperature of 140.degree. C., so that the crystalline structure of the ultra-high molecular weight polyethylene partially breaks up and the thermodiffusion dye penetrates into the molten ski-coating material without additional help from an intermediate
REFERENCES:
patent: 4462852 (1984-07-01), Custor
patent: 4933127 (1990-06-01), Guiguet
Buffalow E. Rollins
Isosport Verbundbauteile Gesellschaft m.b.H.
LandOfFree
Continuous process for producing a decorated ski coating materia does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous process for producing a decorated ski coating materia, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous process for producing a decorated ski coating materia will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2287321