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CN-121986057-A - Nozzle, cap assembly and packaging container

CN121986057ACN 121986057 ACN121986057 ACN 121986057ACN-121986057-A

Abstract

A nozzle (10), the nozzle (10) comprising a base (11) and an annular wall (12) extending from the base (11), the annular wall (12) defining a passageway (121) for the outflow of contents of a packaging container, the base (11) comprising a base wall (111) and a side wall, the side wall comprising a recess recessed towards a central axis of the nozzle (10). A cap assembly (1) comprising a nozzle (10) and a packaging container comprising a cap assembly (1).

Inventors

  • LIANG QINGYANG
  • Ramo Zek

Assignees

  • 康美包（苏州）有限公司

Dates

Publication Date
20260505
Application Date
20230928

Claims (12)

  1. A nozzle, the nozzle (10) comprising a base (11) and an annular wall (12) extending from the base, the annular wall defining a passageway (121) for outflow of contents of a packaging container, the base (11) comprising a base wall (111) and a side wall, characterized in that the side wall comprises a recess recessed towards a central axis of the nozzle.
  2. A nozzle according to claim 1, characterized in that the side wall comprises a plurality of side wall portions (112) connected to each other, at least one side wall portion being provided with one of the recess portions.
  3. Nozzle according to claim 2, characterized in that the recess is located at the bottom of the base (11) and has a maximum recess depth (d) at the bottom edge (1121) of the side wall portion (112), which is defined as the maximum distance of the bottom edge from a straight line defined by the two end points of the bottom edge, wherein the maximum recess depth is designed to be 0.05mm-1mm.
  4. A nozzle according to claim 3, characterized in that the maximum recess depth is designed to be 0.2mm-0.5mm.
  5. A nozzle according to any one of claims 2-4, characterized in that each side wall portion (112) comprises a bottom edge (1121), a bottom plane (P) being defined by three axially opposite lowest points on at least two bottom edges, the end points of said bottom edges having a distance (h) from the bottom plane, which distance is required to be not more than 0.4mm.
  6. A nozzle according to any one of claims 1 to 5, characterized in that the base (11) comprises four side wall portions (112) defining a space having a substantially square cross-section.
  7. Nozzle according to any one of claims 1 to 5, characterized in that the nozzle (10) is formed by injection moulding, the material for which comprises high density polyethylene.
  8. Nozzle according to claim 7, characterized in that the molding material of the nozzle (10) has a shrinkage of 1.6% -2.0%.
  9. Cap assembly, characterized in that the cap assembly (1) comprises a nozzle (10) according to any one of claims 1 to 8 and a cap (20) that can be engaged on an annular wall of the nozzle.
  10. Cap assembly according to claim 9, wherein the cap assembly (1) comprises a spacer portion (13) integrally injection molded with the nozzle (10), the spacer portion being arranged between the passageway (121) and the space (15) defined by the base wall and the side wall and provided with a weakening zone (131).
  11. Cap assembly according to claim 10, wherein the cap assembly (1) further comprises a self-opening sleeve (30) provided with a piercing element (31), wherein upon movement of the cap (20) in a first direction with rotation relative to the annular wall (12), the piercing element (31) on the self-opening sleeve will move in a second direction opposite to the first direction to pierce the weakened zone (131) allowing the passage to be in fluid communication with the space.
  12. Packaging container, characterized in that it comprises a cap assembly (1) according to any one of claims 9 to 11.

Description

Nozzle, cap assembly and packaging container Technical Field The invention relates to the technical field of packaging, in particular to a nozzle, a cover assembly comprising the nozzle and a packaging container comprising the cover assembly. Background Packages for food products, particularly liquid food products, often come in a variety of different forms, which may differ in the material and shape of the container (or packaging cartridge), the form of construction of the lid assembly for the food product package, and the like. In order to obtain a complete food package during actual production, it is first necessary to seal the container (which may be of paper composite or non-paper based material) with the cap assembly at one end thereof, and then to complete the closure of the container at the other end after filling the food to the container with filling equipment. It should be appreciated that well-established process lines are commonly employed in the art to accomplish the above process steps. In particular, in sealingly connecting the container to the cap assembly, it is usual to resort to an assembly mechanism as shown in fig. 1, comprising a plurality of rotatable shaped bars, each intended to cooperate with the container and the cap assembly, respectively. For example, the container and cap assembly may be selectively introduced onto the forming stem in tandem, with the cap assembly and specific portions of the container being thermally activated/heated with high temperature air after both are seated on the forming stem such that the specific portions become molten or flowable under high temperature heating, allowing the two to be forced together under pressure. However, since the forming bars are generally made of metal materials and the cap assembly is made of plastic materials, the materials of the two materials have significantly different coefficients of thermal expansion, so that the degree of thermal expansion of the cap assembly is significantly greater than that of the forming bars when heated by hot air, and thus the cap assembly is extremely easily thrown off the forming bars due to centrifugal force during the high-speed rotation of the forming bars, which is obviously undesirable because it leads to the failure of the subsequent filling process. In view of the above problems, several solutions have been proposed in the prior art. For example, a proposal is known in the art that proposes to provide a greater number of holding portions on the forming lever to increase the holding force of the cap assembly on the forming lever with the increased holding portions. However, this solution still does not solve the problem of the cover assembly being thrown off the forming bar well, and it also results in a considerable design and manufacturing cost. The present invention therefore aims to propose an improved solution that makes it possible to overcome the above-mentioned or other drawbacks of the prior art. Disclosure of Invention The present invention has been made in view of the above background, and an object thereof is to propose an improved nozzle and a cap assembly including the nozzle, so that the problem of the cap assembly falling or being thrown off a forming bar can be solved, thereby reducing the rejection rate of packages to save costs. According to a first aspect of the present invention, there is provided a nozzle comprising a base and an annular wall extending from the base, the annular wall defining a passageway for the outflow of contents of a packaging container, the base comprising a base wall and a side wall, the side wall comprising a recess recessed towards a central axis of the nozzle. As an embodiment, the side wall comprises a plurality of side wall portions connected to each other, at least one side wall portion being provided with one of the recess portions. As an embodiment, the recess is located at the bottom of the base and has a maximum recess depth at the bottom edge of the sidewall portion, which is defined as the maximum distance of the bottom edge from a straight line defined by both end points of the bottom edge, wherein the maximum recess depth is designed to be 0.05mm-1mm. As an embodiment, the maximum recess depth is designed to be 0.2mm to 0.5mm. As an embodiment, each side wall portion comprises a bottom edge, a bottom plane being defined by three axially opposite lowest points on at least two bottom edges, the end points of said bottom edges being at a distance from the bottom plane, which distance is required to be no more than 0.4mm. As one embodiment, the base includes four sidewall portions defining a space having a generally square cross-section. As one embodiment, the nozzle is formed by injection molding, and the material used for injection molding includes high density polyethylene. As one embodiment, the molding material of the nozzle has a shrinkage of 1.6% to 2.0%. According to a second aspect of the invention, it is also proposed a cap