Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1991-04-23
1994-09-27
Simmons, David A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156264, 156267, 156286, 156289, 156291, 156295, 156322, 118 67, 118419, 4273982, B32B 100
Patent
active
053504771
DESCRIPTION:
BRIEF SUMMARY
Modern adhesives have attained an excellent degree of effectiveness, and the trend is to use them more generally by replacing other assembly means. In the field of cardboard articles, and more particularly for packaging, for example, it is often more advantageous to join two parts with glue rather than with hinges or connection tabs.
The general problem, in fixation with an adhesive, can be subdivided into two categories: immediate adhesive bonding, and delayed adhesive bonding. The present invention substantially relates to this second category, which combines all the cases where an adhesive must first be placed on one part, or "substrate", and where then the substrate coated with adhesive, which does not need to be used until later, sometimes quite a long time later, is to be held until it joins the substrate to a "destination" surface, after all sorts of processes have taken place, such as, for example, printing, fashioning, storage, packaging, transportation, shipping, storage once again, removal from storage to retail, various handling operations, and so forth.
The technique of instant gluing has become relatively simple, because in the final analysis it is now reduced to the selection of one species of adhesive, and, as applicable, adapting the adhesive chosen to the problem presented by adjusting its composition and/or its setting time, because both parts are fixed at the same time, and there is no longer a need to distinguish an adhesive substrate and a destination surface. On the other hand, delayed-action adhesive bonding is more complex because it must meet quite diverse requirements, which derive from the existence of three separate situations instead of only one. These situations are:
the deposition of adhesive on a given substrate;
resistance of the adhesive to aging and to physical/mechanical stresses; and
effectiveness of the same adhesive on the destination surface, even a long time after its initial deposition on the substrate.
Here, two very different operations must be distinguished, even though they always involve the same adhesive; namely, adhesion to the substrate, and adhesion to the destination surface, all of which must be effective in order to effect joining of the substrate and the destination surface. Currently available solutions to this problem do not give complete satisfaction in all fields of application. For example, it is quite easy to deposit adhesives, called "self-adhesive", to substrates comprising materials that have a regular surface and or excellent planarity. This is true for the paper used in the manufacture of envelopes, in particular, because, when the adhesive is deposited, the paper is placed on a rigid, flat substrate, such as a steel plate, so that its flexibility is translated into an adaptability to this substrate from which it acquires the characteristics. Finally, if the paper is guided and held correctly, it behaves as if it, itself, were rigid and hard. This is also true for materials that naturally have these characteristics, such as glass, metal, synthetic materials, and compact cardboards with correct surfaces.
Thus, in cases where the adhesive is solidly associated with the substrate, later adhesive bonding to the destination surface is nevertheless not assured, because once again the qualities of the adhesive must be maintained over time, and there must be a correct destination surface. Once again, the case of the paper is relatively simple. Since it is both flexible and thin, the destination surface will be perfectly adapted to the adhesive.
In these favorable cases, the problem to be solved is to mask the adhesive so that it will not accidently adhere to other objects and to protect it against the retention of dust and against aging (drying, oxidation, etc). The solution adopted comprises placing a strip incorporating silicones on the adhesive so that this strip adheres only very little to the adhesive. On the other hand, pressure-sensitive adhesives are poorly adapted to materials that are not either regular or rigid or, contrarily, very flexi
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Specifications: Scotch Brand T-627 Flat Surface Tape Applicator.
Easy Trim Wall Base Element by Kafco (National Floor Products Co., Inc. Florence, Ala.
Photographs numbered 1 through 12, together with Technical Bulletin No. 100-86 (Revised Dec. 1, 1986).
Chevalier Jacques P.
Chevalier Pierre A.
Veniard Gilbert E.
Chevalier Pierre A.
Dixon Merrick
Simmons David A.
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