Plug for closing any opening and method of manufacturing this plug
AssigneeRapid S.A.
InventorsJean-Michael Pierrot, Jean-Pierre Leon, Philippe Vigouroux
Life of this patent
Estimating the term…
Abstract
The invention relates to an obturating stopper plug as well as to a method of manufacture of this stopper plug. The stopper plug for obturating any opening (2) and comprising a bead of heat-fusible adhesive (7) deposited upon the said stopper plug is characterized in that the bead of heat-fusible adhesive (7) comprises: (a) an adhesive mixture, (b) a cross-linking agent, (c) an expansion agent decomposing at a temperature close to the cross-linking temperature of the adhesive mixture (a), (d) additives for working purposes. The invention is applicable to the obturation, for example, of an opening in a plate to be passed into a drying oven for paint.
Claims13
A plug for obturating an opening defined by an edge of a plate, the stopper plug comprising:
- a surface having a dimension larger than the opening;
- hooking lugs projecting from said surface for hooking said plug to the edge of the plate from inside the opening;
- an annular groove between a free edge of the surface and the hooking lugs;
- and
- a bead of a heat-fusible adhesive embedded in said annular groove and comprising:
- (a) an adhesive mixture comprising a material selected from the group consisting of a terpolymer of ethylene/acrylic ester/maleic anhydride, a maleic anhydride-grafted copolymer of ethylene/acrylic ester, and combinations thereof,
- (b) a peroxide cross-linking agent,
- (c) an azodicarbonamide expansion agent decomposing at a temperature close to a cross-linking temperature of the adhesive mixture, and
- (d) additives for working purposes.
A plug for obturating an opening defined by an edge of a plate, the plug comprising:
- a surface comprising a dimension larger than a dimension of the opening;
- hooking lugs projecting from said surface for hooking the plug to the edge of the plate from inside the opening;
- an annular groove on said hooking lugs;
- and
- a bead of heat-fusible adhesive embedded in the annular groove and comprising:
- (a) an adhesive mixture,
- (b) a peroxide cross-linking agent,
- (c) an azodicarbonamide expansion agent decomposing at a temperature close to a cross-linking temperature of the adhesive mixture, and
- (d) additives for working purposes.
A method of manufacturing a plug for obturating an opening defined by an edge of a plate, the method comprising:
- injection molding a structure and a heat-fusible bead of adhesive in the same mold in two successive injections, wherein said injection molding of said bead of adhesive occurs at a temperature lower than a decomposition temperature of an expansion agent in said adhesive, and
- wherein the structure comprises:
- a surface comprising a dimension larger than a dimension of the opening,
- hooking lugs protecting from said surface for hooking the plug to the edge of the plate from inside the opening, and
- an annular groove on said hooking lugs;
- and wherein
- the bead of heat-fusible adhesive is embedded in the annular groove and comprises:
- (a) an adhesive mixture,
- (b) a peroxide cross-linking agent,
- (c) an azodicarbonamide expansion agent decomposing at a temperature close to a cross-linking temperature of the adhesive mixture, and
- (d) additives for working purposes.
Dependencies are inferred from the claim text.