Lid assembly for a packing container, packing container with such a lid assembly, and method for manufacturing same

Abstract

A lid assembly, for a packing container, includes a lid ring of a plasticizable, thermoplastic polymer material and a dimensionally stable lid part, to be placed on the lid ring. The lid part (or the lid ring) has a layer of a peelable plastic material, on a side facing the lid ring (or the lid part), that contains a sealable, thermoplastic polymer or is coated with a cover layer of such a polymer. The lid ring (or the lid part) has an end face facing the lid part (or the lid ring), with two parallel circumferential projections, arranged at a distance of at most 3 mm and sealed to the peelable layer or to the cover layer of the lid part (or of the lid ring). A packing container with such a lid assembly as well as a method for manufacturing same by ultrasonic welding are also provided.

In the claims: 
     
         1 . A lid assembly for a packing container, the lid assembly comprising:
 a lid ring consisting of a plasticizable, thermoplastic polymer material; and   a dimensionally stable lid part, which can be placed on the lid ring, wherein:   the lid part has, on a side facing the lid ring, at least one layer of a peelable plastic material, wherein the layer of peelable plastic material contains at least one sealable, thermoplastic polymer and/or is coated with a cover layer consisting of such a polymer, and wherein the lid ring has, on an end face facing the lid part, at least one circumferential projection, which is sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; or   the lid ring has, on a side facing the lid part, at least one layer of a peelable plastic material, wherein the layer of peelable plastic material contains at least one sealable, thermoplastic polymer and/or is coated with a cover layer consisting of such a polymer, and wherein the lid part has, on an end face facing the lid ring, at least one circumferential projection, which is sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; and   the lid ring has, on an end face facing the lid part, at least two circumferential projections arranged essentially parallel, which are sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; or   the lid part has, on an end face facing the lid ring, at least two circumferential projections arranged essentially parallel, which are sealed to the layer of peelable plastic material and/or to the cover layer of the lid ring,   wherein a distance between the circumferential projections is at most 3 mm.   
     
     
         2 . A lid assembly in accordance with  claim 1 , wherein at least two circumferential projections of the lid ring or of the lid part are arranged essentially concentrically with a radial distance that is at most 3 mm. 
     
     
         3 . A lid assembly in accordance with  claim 1 , wherein the lid ring or the lid part has exactly two circumferential projections on the end face thereof. 
     
     
         4 . A lid assembly in accordance with  claim 1 , wherein the distance between the circumferential projection is between 0.3 mm and 3 mm. 
     
     
         5 . A lid assembly in accordance with  claim 1 , wherein the circumferential projections have a height between 0.05 mm and 0.4 mm. 
     
     
         6 . A lid assembly in accordance with  claim 1 , wherein a cross section of the circumferential projections tapers to a point toward a free end of the circumferential projections. 
     
     
         7 . A lid assembly in accordance with  claim 1 , wherein circumferential projections have an essentially triangular cross section. 
     
     
         8 . A lid assembly in accordance with  claim 1 , wherein the lid part has a thickness totaling at least 0.2 mm. 
     
     
         9 . A lid assembly in accordance with  claim 1 , wherein at least the lid part has at least one additional layer in the form of an essentially gas-tight and liquid-tight barrier layer. 
     
     
         10 . A lid assembly in accordance with  claim 1 , wherein the lid part has at least one circumferential projection, which projects in a direction of the lid ring and has a cross section that is adapted to a contact surface of the lid ring, which said contact surface is complementary to the lid part, such that the lid part can be fixed to the lid ring after a first-time separation from the lid ring, and the lid part is especially sealingly in contact with the contact surface thereof. 
     
     
         11 . A packing container comprising:
 a sleeve;   a lid assembly comprising a lid ring consisting of a plasticizable, thermoplastic polymer material, and a dimensionally stable lid part, which can be placed on the lid ring , wherein:   the lid part has, on a side facing the lid ring, at least one layer of a peelable plastic material, wherein the layer of peelable plastic material contains at least one sealable, thermoplastic polymer and/or is coated with a cover layer consisting of such a polymer, and wherein the lid ring has, on an end face facing the lid part, at least one circumferential projection, which is sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; or   the lid ring has, on a side facing the lid part, at least one layer of a peelable plastic material, wherein the layer of peelable plastic material contains at least one sealable, thermoplastic polymer and/or is coated with a cover layer consisting of such a polymer, and wherein the lid part has, on an end face facing the lid ring, at least one circumferential projection, which is sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; and   the lid ring has, on an end face facing the lid part, at least two circumferential projections arranged essentially parallel, which are sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; or   the lid part has, on an end face facing the lid ring, at least two circumferential projections arranged essentially parallel, which are sealed to the layer of peelable plastic material and/or to the cover layer of the lid ring, wherein   a distance between the circumferential projections is at most 3 mm and   the lid ring is fixed at one end of the sleeve in an essentially gas-tight and liquid-tight manner.   
     
     
         12 . A packing container in accordance with  claim 11 , wherein the sleeve has an essentially gas-tight and liquid-tight inner lamination. 
     
     
         13 . A packing container in accordance with  claim 12 , wherein the inner lamination of the sleeve has at least one layer consisting of a sealable plastic material, which is sealed to the lid ring of the lid assembly. 
     
     
         14 . A method for manufacturing a lid assembly comprising a lid ring consisting of a plasticizable, thermoplastic polymer material, and a dimensionally stable lid part, which can be placed on the lid ring , wherein:
 the lid part has, on a side facing the lid ring, at least one layer of a peelable plastic material, wherein the layer of peelable plastic material contains at least one sealable, thermoplastic polymer and/or is coated with a cover layer consisting of such a polymer, and wherein the lid ring has, on an end face facing the lid part, at least one circumferential projection, which is sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; or   the lid ring has, on a side facing the lid part, at least one layer of a peelable plastic material, wherein the layer of peelable plastic material contains at least one sealable, thermoplastic polymer and/or is coated with a cover layer consisting of such a polymer, and wherein the lid part has, on an end face facing the lid ring, at least one circumferential projection, which is sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; and   the lid ring has, on an end face facing the lid part, at least two circumferential projections arranged essentially parallel, which are sealed to the layer of peelable plastic material and/or to the cover layer of the lid part; or   the lid part has, on an end face facing the lid ring, at least two circumferential projections arranged essentially parallel, which are sealed to the layer of peelable plastic material and/or to the cover layer of the lid ring, wherein   a distance between the circumferential projections is at most 3 mm, the method comprising the steps of:   placing the lid part on the lid ring; and   energizing the lid part with ultrasound, wherein the layer of peelable plastic material and/or the cover layer of the lid part or of the lid ring is sealed ultrasonically to the at least two circumferential projections of the lid ring or of the lid part while a fused connection is formed between the circumferential projections.   
     
     
         15 . A method in accordance with  claim 14 , wherein the lid part is energized by means of at least one sonotrode, which extends at least essentially around an entire circumference of the at least two circumferential projections of the lid ring or of the lid part. 
     
     
         16 . A method in accordance with  claim 14 , further comprising providing a sleeve of a packing container, wherein the lid ring is placed first on the sleeve of the packing container and the lid part is then sealed ultrasonically to the lid ring. 
     
     
         17 . A method in accordance with  claim 16 , wherein the lid ring is sealed to an inner lamination of the sleeve, which has at least one layer consisting of a sealable plastic material.