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AssigneeSacmi Cooperativa Meccanici Imola Societa' Cooperativa
InventorsFabrizio VILLA, Carlo VENTURI, Marco MINGHETTI, Roberto CIPOLLINI
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A method and an apparatus for applying a dose of sealing material to a closing cap of a container to form a gasket are disclosed, in which an annular dose is separated from a flow of plasticized material and is deposited on a base of the cap; the plasticized material is fed through a channel until it arrives at a material outlet extending along a circumferential direction; the annular dose comprises at least one differentiated portion, whereby a radial section in the differentiated portion of the annular dose is different from a radial section in another portion of the annular dose, where “radial” is understood to refer to an axis about which the annular dose extends in a circumferential direction; the presence of a differentiated portion decreases the risk of forming an air pocket between the sealing material and the caps.
Application method, comprising the steps of:
Method according to claim 19, wherein the sum SD of the lengths in the circumferential direction of the differentiated portions is less than the sum SC of the lengths in the circumferential direction of the continuous portions;
Apparatus according to claim 10, comprising two or more differentiated outlet parts angularly spaced apart from each other and separated from each other by at least one continuous part of the material outlet;
Apparatus according to claim 22, wherein each continuous part of the material outlet extends along an arc of circumference with an angular extent greater than 30°, or greater than 45°, or greater than 60°;
(canceled)
Apparatus according to claim 10, wherein each differentiated outlet part of the material outlet (4) extends in a circumferential direction for a length less than one 1/10, or less than one 1/20, or less than one 1/30, or less than one 1/60, of a total length of the material outlet in the circumferential direction.
Apparatus according to claim 10, wherein the differentiated outlet part comprises at least one cavity obtained on the to form, in the differentiated portion of the annular dose, a bridge of material that joins two portions of the annular dose, and wherein the differentiated outlet part comprises an outlet obstruction that is integral with the feeder and the cavity comprises a gap formed in the feeder or a groove obtained on the outlet obstruction.
(canceled)
Apparatus according to claim 10, wherein the differentiated outlet part comprises at least one cavity in the form of a slit obtained on an annular cutting element of the separator to form an appendage of material that protrudes from the annular dose.
Apparatus according to claim 10, wherein the feeder is connected to an extruder for sealing material that is suitable for forming a gasket and the material includes plasticized material;
Apparatus according to claim 10, wherein the differentiated outlet part comprises an outlet obstruction or an outlet enlargement.
Dependencies are inferred from the claim text.