Process and means for producing a support part and a support par

Details Process and means for producing a support part and a support par Process and means for producing a support part and a support par

1997-01-30

1999-06-22

Houtteman, Scott W.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including sheet or component perpendicular to plane of web...

428 98, 428121, 428195, 428200, B32B 702

Patent

active

059141700

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a process and means for producing a support part, especially a plastic tray, and a support part produced with it, which has a flat bottom and optionally an edge which projects upward on its outside border, the bottom surface of the support part having properties which prevent slipping of articles placed thereon.
Production of plastic trays by injection molding from materials such as acrylobutadiene styrene, styrene acrylonitrile, polypropylene, polycarbonate and the like is known. These plastic trays have adequate stability of shape and resistance to traffic loads and due to their resistance to detergents allow repeated use.
Very often trays of this type are used to serve food on aircraft, but also on railway dining cars and on buses. Of course, the problem arises here that the articles placed thereon must be prevented from slipping on the bottom of the tray during changes of location and vibrations.
If articles to be placed thereon cannot be matched to one another in the conventional manner such that they have space completely within the bottom surface bounded by the edge while largely avoiding intermediate spaces and prevent sliding relative to one another, the effort is made to impart to the bottom surface antislip properties; this is done moreover by molding in a surface profile during injection molding, by loosely inserting a blank of a material with the corresponding adhesive properties, or by cementing a blank with antislip properties.
Texturing of the surface of a tray body of the aforementioned materials does not always lead to success relative to the different materials of the articles to be placed, and for deep and sharp-edged profiling can also cause problems in the cleaning of the tray.
Loose insertion of a film blank with antislip properties causes a part to be handled separately both in serving and clearing, and before cleaning the tray after use it requires disposal, since the loosely inserted blank cannot be reused.
Cementing in a blank with antislip properties makes production of trays more expensive and complex and does not allow their repeated re-use since sufficient resistivity of the adhesive bond between the tray and the cemented-in blanks cannot be expected for the washing temperatures and detergents used.


SUMMARY OF THE INVENTION

The invention is intended to accomplish the objective of devising a process such that a support part, especially a plastic tray, with properties of its bottom surface which prevent slippage of articles placed thereon, can be produced relatively quickly and economically such that its slip resistance is increased and upon frequent use repeated re-use even after intensive cleaning is possible.
The procedure indicated here in injection molding of support parts, especially of plastic trays, can be defined as applying the conventional inmold decoration of injection moldings to molded articles. It has been found that the demand which results from the shape of the covering part or base part when the mold halves of the injection molding machine are closed, i.e., the demand for length of the carrier unused in this working cycle and the long piece or blank of antislip film material to be back-sprayed which is located on the carrier, neither jeopardizes the exact positioning of the blank, the blanks or the segments of this film material in the area of the bottom surface of the support part, nor does it lead to difficulty in removing the carrier after the injection molding process.
Furthermore, it has been shown that the transition areas which remain open in use of the support part between the surface areas not provided with back-sprayed film and the back-sprayed film withstand the mechanical and chemical stresses which take effect in intensive cleaning.
One surface which is open after removing, the support part from the mold or areas of this surface of the bottom of these parts can be textured without the need to provide the corresponding part of one mold half of the injection molding machine with texturing at h

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