Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1991-06-05
1993-06-08
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
2641761, 2641772, 264257, 264330, 428224, 428105, 428114, 4283179, B32B 516
Patent
active
052178005
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a shaped part of injected or extruded plastic parts with plastic waste contained in them, with a flow point which is greater than a maximum processing temperature of the shaped part, and these are welded in dispersed form and/or embedded in the shaped part, with a flock size of less than 6 mm. Furthermore, the invention also comprises a method for the production of such a shaped part.
A shaped part of extruded plastic parts with waste plastics contained in them, in which the plastic has a flow point which is higher than the maximum processing temperature of the shaped part is already known--pursuant to U.S. Pat. No. 3,864,193. According to this patent, these waste plastics are welded in dispersed form into the shaped part. The flock size of these waste plastics is less than 6 mm. By adding a small amount of such plastic waste, a plastic sheet or film is to be formed which looks similar to mouth-blown glass. This shaped part cannot be used as a construction element.
The most varied of shaped parts made from waste plastics and also various methods for the production of such shaped parts form waste plastics are already known. In these shaped parts, or respectively in the methods for the production of such shaped parts, until now one has always proceeded from the fact that for the production of shaped parts from waste plastics, these are separated from each other in very costly processes and plastics which are as identical as possible in type are joined together for common reprocessing. All these mostly very involved and therefore also high cost methods and the devices necessary for them involve the disadvantage that an economical production of shaped parts which are able to be stressed to a satisfactory extent as regards bending, tension or respectively stretching, is not possible.
In addition, therefore, a method is known for the production of shaped parts from mixed waste of various synthetic resins--according to British Patent No. 1,521,720--in which it was proposed to heat the plastic waste and to place it under pressure, after which or at the same time as which a fibrous material is mixed in, the individual fibers of which have an average length which is approximately three times as great as an average size of the flocks produced from the waste plastics. The flock size here should preferably be 1 to 4 mm. Through the addition of such fibrous materials, the bending strength, the bending modulus, the heat deflection temperature under load, and also, if applicable, the impact capability, are to be increased. Provision is made here that continuous threads of strips are also used to reinforce the sections. However, one also proceeds here from the fact that an efficient application of the method is only possible when plastics which are as identical as possible in type, or only small proportions of other plastics, are mixed together, in order to thereby actually achieve an increase in strength. Through the separation of the waste plastics into plastics of the same type, and through the costly purification, even with this method the initial costs are very high, so that an economic use is not possible in all cases.
A further problem, in particular in the processing of waste plastics which originate from household refuse, industrial refuse or other collected plastics, such as films, packaging, bottles or the like, lies in the odor nuisance in the finished product. In order to prevent this odor nuisance it is already known--according to EP-OS 0 062 957--to treat the plastic waste, in particular from household refuse, below the softening point of respectively melting point of the plastic with steam and/or with boiling water and thereafter to melt the plastic waste in a substantial absence of water vapor and to process it further. No statements are made with regard to the composition of the household refuse or respectively the components to be used,, and the processing, so that no improvements are able to be achieved with regard to loading capacity.
However, it is also already known--accordin
REFERENCES:
patent: 3806562 (1974-04-01), Lamort et al.
patent: 3864193 (1975-02-01), Frierson et al.
Bell James J.
Schaumstoffwerk Greiner Gesellschaft m.b.H.
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