Package making – Methods – With contents treating
Patent
1996-05-28
1998-08-18
Moon, Daniel
Package making
Methods
With contents treating
53510, B65B 3102
Patent
active
057944083
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
The present invention relates to an inerting process for moisture proof packaging covers, a machine and valves for carrying out such a process, as well as such used packaging covers, which are more particularly useful for the industrial packaging of products which can be affected by moisture, oxygen and external pollutions of various types.
In the field of the invention, the term "inerting" relates to any means allowing to put products under an inert atmosphere as above-defined and further detailed below.
PRIOR ART SUSTAINING THE PRESENT INVENTION
Various packaging or storage systems are presently used by packaging or industrial companies. Most currently the items, namely the industrial products, are packed in a strong cover, for example, in non-woven fabrics, the most delicate or the sharpest parts are reinforced by a so-called "bubblepack" or similar materials. Drying agents are put inside the cover in quantities determined by the manufacturers according to the water vapour permeation of the cover and the packaging volume and blocking elements are so positioned to immobilize the product being packed and finally a metallized cover is placed above the whole assembly and a vacuum is applied inside the cover so as to protect the packed piece of equipment. Finally the whole "package" is put into a wood box so as to provide a complete protection of the packed product. This method of packaging or storage has various disadvantages.
First of all, positioning the cover of non-woven fabrics and reinforcing or blocking elements inside the cover requires plenty of labour, which implies costs which are far from negligible. Also the reinforcing elements are expensive and often introduce moisture or other pollutants inside the cover.
Further, the drying agents are rarely heated to be made completely anhydrous and are used as such. Since they are themselves packed in moisture-containing bags, they are already water-saturated when they are put into the cover and reject their excess moisture inside the cover.
Moreover, vacuum is applied through a vacuum pump held by a worker above the cover opening which remains open after the cover has been partially closed and the whole assembly is sealed by another worker with a welding grip. It goes without saying that the vacuum is the assembly is only partial, which implies that moisture and other pollutants remain inside the cover.
Finally the covers existing on the market are relatively porous and let moisture or other pollutants through. Moreover, they are quite thin and easily perforated, which makes them very sensitive to any handling, mainly at the welds.
Further, in case of long-term storage of materials sensitive to moisture or other pollutants, it is necessary at the present time to re-open the covers, to remove the drying agents, to substitute them for new ones and to close the covers again. That requires plenty of labour and time, and possibly material cost when the cover has to be replaced by a new one, without giving any guarantee as for the good condition of the materials contained in the covers.
Other industrial companies, for example in the armament field or the metallurgical industry, send their products to specialized companies who oil them or coat them with oiled paper. After arriving at their destination, the products are sent again to another specialized company where they are unoiled. It is clear that the costs added to the prices of such industrial products are very important.
Further, companies may dip their products into wax. The extreme costs involved to "unwax" the products when they are supposed to be used make the process uneconomical.
Other companies also hold their products in rooms which are especially heated or permanently provided with hot air so as to remove moisture, which is also expensive.
Other companies hold their products in nitrogen-containing containers. The process is convenient, but requires that the items of equipment should have small dimensions so as to be able to be put into the container. Since not all prod
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Patouraux Andre
Patouraux Philippe
Madpack-Servicos Internacionais, LDA
Moon Daniel
Tolan Ed
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