Special receptacle or package – For tacky material
Patent
1995-02-13
1997-07-29
Ackun, Jacob K.
Special receptacle or package
For tacky material
2065241, B65D 8500
Patent
active
056514603
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to packs for adhesives and/or sealants according to the preamble of the claim, to their use and to a method for filling and emptying them.
For industrial consumers, adhesives and sealants are supplied in drums or similar large-volume containers which are generally made of metal. For moisture- and/or air-curing one-component adhesives, these packs must effectively prevent the penetration of air and moisture to avoid premature curing or hardening of the adhesive/sealant. This impermeability to air and moisture has to be guaranteed during filling, transport, storage and emptying of the pack.
In view of increasingly more stringent pollution control legislation, packs of the type in question also have to be completely or at least partly recyclable. This requirement is particularly difficult to meet in the case of moisture-curing and/or air-curing adhesives/sealants because, in the case of paste-like or high-viscosity materials, the penetration of traces of atmospheric moisture, particularly during or after emptying, can lead to partial or complete hardening on the inside of the drum. This often results in coatings which adhere firmly to the inside or bottom of the drum and which make the drums difficult, if not impossible, to clean. Even where the drums are used as scrap metal, problematical combustion products can be formed from the hardened adhesive/sealant residues.
2. Discussion of Related Art
DE-C-36 05 422 describes a method of filling and emptying a container for a flowable material, the material in question being introduced into a flexible inner pack impervious to the material. This inner pack is adapted to the dimensions of the outer transport container, generally a metal drum or sealed tin container. In this method, the bag-like inner pack is first filled with the flowable material in a pot-like temporary container by means of a suitable filling unit. The dimensions of the temporary container are somewhat smaller than the corresponding inner dimensions of the actual transport container. A stiff cover plate is then placed on the surface of the material and the inner pack is tightly closed at its upper end by folding the edges over one another and welding them together. The inner pack thus filled and sealed is then turned through 180.degree. together with the temporary container and placed on the somewhat larger transport container so that the filled and sealed inner pack can be introduced into the transport container. The transport container is then closed with a lid. After transport to the point of use, the lid is taken off to remove the material, after which the material is removed by means of a suitable pump. The pump is best connected to a pressure follower plate. After an opening has been cut into the flat surface, the pressure follower plate is applied and the material to be removed is forced out upwards through compression of the inner pack. The method according to DE-C-36 05 422 is also described in detail in Adhesion 1987, No. 12, pages 25-26.
In the case of particularly sensitive materials, it is not sufficient for the inner pack to be impervious solely to the material introduced. Accordingly, DE-U-88 12 012 proposes bags of multilayer composite films for the inner pack, the composite films consisting of three layers of polymer film and one layer of metal foil to provide the adhesive/sealant with even better protection against the effect of moisture and/or air.
These known methods enable the transport containers to be more or less completely emptied so that they may be reused after removal of the empty inner pack and after reconditioning in the usual way, providing the containers are multi-trip containers. Non-reusable transport containers may be recycled as waste after removal of the empty inner pack.
In practice, however, it has been found that the prior art is in need of improvement in certain crucial aspects: material. During changing of the drum, this material is exposed to atmospheric moisture so that partial
REFERENCES:
patent: 2636658 (1953-04-01), Baumer et al.
patent: 4318475 (1982-03-01), Robinson
patent: 5183152 (1993-02-01), Zak et al.
Adhasion 1987, No. 12, pp. 25-26.
Ackun Jacob K.
Grandmaison Real J.
Jaeschke Wayne C.
Szoke Ernest G.
Teroson GmbH
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