Compositions – Fluent dielectric – N-containing
Patent
1985-11-26
1989-02-14
Sneed, H. M. S.
Compositions
Fluent dielectric
N-containing
134 7, 134 251, 134 254, 134 252, 134 38, 51298, 15 3, 15 95, 25217423, 25217425, C11D 337, C11D 720, C11D 1700
Patent
active
048044881
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to dish-washing machines which operate with blasting bodies mixed into the dish-washing water, this water being sprayed through nozzles against the utensils in a dish-washing compartment in a dishwasher, so as to dislodge and remove food residues present on the utensils. Upon completion of a working cycle, the water is, in the majority of cases, passed through a sieve or strainer, to separate the blasting bodies from the dish-washing water and collect the bodies for re-use in the dish-washer. In certain machines the blasting bodies settle in the machine as the dish-washing water is removed therefrom and are then introduced into the fresh dish-washing water. This wet-blasting technique has been known in many different forms for the last 20 years, as is evident from, for example, the German published Specifications Nos. 1 151 906, 1 148 360, 1 220 095, 1, 428 456, the Finnish Published Specification No. 47 722 and the U.S. Pat. Nos. 3,323,159, 3,272,650 and 4,374,443. In certain cases the blasting bodies used have the form of metal spheres, sand, crushed marble, or other heavy and hard-blasting material. One disadvantage with blasting bodies of such hardness, e.g. crushed marble, is that they cause wear on the utensils being washed. In other instances, the blasting bodies have the form of light-weight plastics pellets, which float around in the dish-washing water. The plastics from which such pellets are made may be a relatively hard plastics, such as Delrin.RTM..
SUMMARY OF THE INVENTION
The object of the present invention is to provide blasting bodies of such properties that their advantages are greater than those of hitherto known blasting bodies for wet-blasting purposes, certain properties of the blasting bodies being advantageous in more than one respect. This is achieved by using for dish-washing purposes blasting bodies of the kind set forth in the following main claim.
The blasting bodies according to the invention can be produced relatively cheaply. This is achieved by forming a composite mix in which one constituent comprises a relatively inexpensive plastics, such as polyamide or polyethylene which is considerably cheaper than the previously used plastics Delrin.RTM. and which, in addition, has a much greater resistance to heat and alkali. The plastics is mixed with a known inexpensive filler forming a further constituent of the mix. Such fillers comprise powderous mineral fillers such as silicate, sulphate or carbonate. Barium sulphate can also be used to advantage. By mixing such mineral fillers in percent by weight, in quantities of about 60% by weight, the plastics will serve as an effective binder for the hard mineral particles, which are wear-resistant and therewith lengthen the useful life-span of the blasting bodies, thereby greatly reducing running costs in relation to hitherto known blasting pellets made of Delrin.RTM..
The filler should have a hardness greater than 3.0 measured according to Moh's hardness scale. Admixture of filler in amounts corresponding to about 60% by weight results in a considerable increase in the specific gravity of the blasting bodies and therewith the weight of the individual bodies of given shape and size, which is a considerable advantage in terms of improved blasting ability. In this respect, the specific gravity is increased to lie around 2.0 which means that for a given impact velocity, the blasting bodies with a weight of about 0.04 g will strike the utensils and food residues thereon with greater force than obtained by means of known plastics pellets having a weight of less than 0.02 g. In addition, the heavy weight of the blasting bodies makes it possible to reduce considerably the speed at which they are projected while still maintaining a blasting effect superior to that obtained with plastics pellets. This reduction in velocity enables the use of smaller pumps with lower energy consumption, and in addition thereto the lower speed of the water jet-blasting bodies results in a softer impact against the utensils being w
REFERENCES:
patent: 2189761 (1940-02-01), McKenna
patent: 3272650 (1966-09-01), MacVittie
patent: 3323159 (1967-06-01), Ummel et al.
patent: 3424616 (1969-01-01), Townsend
patent: 4333771 (1982-06-01), Altenschopfer et al.
patent: 4374433 (1983-02-01), Mosell
Cohen Sharon T.
Sneed H. M. S.
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