Method and apparatus for joining a sealing element to a cylindrical container sleeve
AssigneeAssi Can Aktiebolag
InventorRolf Berg
Life of this patent
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Abstract
A container sleeve 1 having an inner coating 5 of a heat weldable plastics material is fitted with a closure element 2 having a collar 4 of meltable plastics material. The assembly is rotated while a hot welding shoe 35 is inserted through the open end of the sleeve and brought to bear against the collar, which melts the latter and fuses it to the tackified coating 5 to thereby provide a tightly sealed joint.
Claims10
A method of joining to a cylindrical container sleeve (1) a sealing or closure element (2) provided with a circular collar (4) arranged to be inserted into one open end of the container sleeve, into abutment with the inner wall thereof, at least the collar comprising a heat-meltable plastics material, wherein the sealing or closure element is mounted on the container sleeve with the collar in abutment with the inner wall of said sleeve;
- wherein the container sleeve and the sealing or closure element are rotated around the cylinder axis of said sleeve;
- wherein at least one heated body (35) whose temperature exceeds the melting point of the plastics material in the collar is pressed against said collar;
- and wherein the container sleeve is rotated until the plastics material in said collar has melted, whereafter the heated body is removed out of contact with the plastics material and the plastics material is then permitted to solidify.
An apparatus for joining a cylindrical container sleeve (1) to a sealing or closure element (2) provided with a collar (4) made of a heat-meltable plastics material, said collar abutting a ring-shaped end part of the inside of the container sleeve, said collar being firmly welded to the container sleeve within said end part by supplying heat thereto, characterized by:
- means (6,14) for holding and rotating the container sleeve (1) and the sealing or closure element (2) around the cylinder axis of the container sleeve;
- at least one welding member (35) arranged to be maintained by heated means (39) at a temperature which exceeds the melting point of the plastics material;
- movement means (27, 33, 36, 38) for moving the welding member into contact with said collar to melt it during rotation of the container sleeve and for moving said welding member (35) out of contact with the molten plastics material after a given interval of time has lapsed.
Dependencies are inferred from the claim text.