JP3043367U - Cap structure for high frequency heat seal - Google Patents

Abstract

(57) [Problem] To provide a simpler structure than a conventional product in which a ring-shaped small projection is provided on a top surface of a cap, secure sealing performance, and weld the top surface of the cap to a sealing member. The present invention provides a new type of high-frequency heat sealing cap which does not bring about, and therefore does not hinder opening of the sealed cap. A polyethylene-based synthetic resin cap that is screwed into an opening above a screw thread of a synthetic resin container mouth, and has an annular shape in which a position corresponding to an outer peripheral surface of the container opening is substantially centered on an inner top surface. For a high frequency heat seal, characterized in that a groove is provided and a lower surface between the inner sides of the annular groove is formed with a step lower than the outer lower surface by about 0.05 to 1 mm on the top surface side. cap.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a high-frequency heat-sealing cap, and more specifically, a sealing member (hereinafter simply referred to as "sealing member") formed by laminating a synthetic resin film on the lower surface of an aluminum foil is placed on the container opening. The present invention relates to a cap used for sealing by high-frequency heating while being screwed into a container opening.

[0002]

[Prior art]

 Conventionally, a sealing member was placed on the opening of a synthetic resin container, and high-frequency heating was performed while the cap was screwed on, and the synthetic resin film on the lower surface of the sealing member was welded to the opening of the container. A method of sealing the opening is adopted. In this case, if the top surface of the inside of the cap is in direct contact with the upper surface aluminum foil of the seal member, this part will also be welded and it will be difficult to open the cap after sealing. When placing a high-melting point synthetic resin film or placing an aluminum foil directly on the upper surface for high-frequency heat sealing, we propose a cap that makes the contact area with the top surface of the cap as small as possible. Has been done. For example, in Japanese Examined Patent Publication No. 58-44555, a ring-shaped small protrusion is provided on the inner top surface corresponding to the flange portion provided at the container mouth, and annular grooves are provided inside and outside the small protrusion. A digit cap is disclosed. This concentrates the pressing force on the flange of the ring-shaped small projection on the inner top surface, and conducts the excess heat generated during high-frequency oscillation to the tip of the small projection, transforming this fusion zone into both annular grooves. By storing it, the sealing property is improved. However, the structure is complicated, such as providing a constricted part that is integral with the flange part.

[0003]

[Problems to be solved by the device]

 The present invention has a simpler structure than the conventional product in which a ring-shaped small protrusion is provided on the top surface of the cap, and the sealing performance is secured, and at the same time, the top surface of the cap and the aluminum foil of the sealing member are welded together. Therefore, it is an object of the present invention to provide a new type of cap for high-frequency heat sealing, which does not bring about a problem and therefore does not hinder the opening of the cap after sealing.

[0004]

[Means for achieving the object]

 The present invention relates to a polyethylene synthetic resin cap that is screwed into the opening above the screw thread of the synthetic resin container opening, and has an annular shape with the inner top surface corresponding to the outer peripheral surface of the container opening in the approximate center. For high-frequency heat sealing, characterized in that a groove is provided and the lower surface between the inner side of the annular groove is formed with a step lowering by 0.05 to 1 mm on the top surface side than the outer lower surface. It is a cap.

[0005]

[Embodiment of the invention]

 Hereinafter, a cap of the present invention and a method for sealing a container opening using the cap will be described with reference to the embodiments shown in the drawings.

FIG. 1 shows the sealing member illustrated in FIG. 3 above the container opening (1), that is, a synthetic resin film (4) on the lower surface of an aluminum foil (3) having a pull tab (2) at a part of the periphery. FIG. 2 is a cross-sectional view showing a state in which a seal member (5) laminated with (1) is placed, and the cap (6) of the present invention is put on the seal member (5) and screwed into the container opening (1). It is an enlarged view of the A section described in FIG. The sealing member (5) placed on the container opening (1) closes the annular groove (7) provided on the inner top surface of the cap (6) to form a space (air layer) and the container. The sealing member (5) protruding from the outer end of the opening (1) is in close contact with the outer lower end of the annular groove (7), and is somewhat folded.

Then, when a high frequency is oscillated in this state, the aluminum foil (3) generates heat, and the synthetic resin film laminated on the aluminum foil (3) is welded to the container opening (1) to ensure hermeticity.

By the way, in the high-frequency seal, first, the outermost end of the aluminum foil (3) is heated to sequentially generate heat inward. Therefore, in the cap of the present invention, the inner top surface of the cap is the container opening. Since the annular groove (7) is formed at the upper end outer peripheral surface corresponding portion of the portion (1), and the outer lower end of the annular groove (7) presses the aluminum foil (3), the annular groove (7) is formed. The outer lower end of the has a heat conduction blocking effect, and even if it melts due to heat generation, the air layer existing in the annular groove (7) acts as a cooling medium, and high-frequency vibration causes the upper surface of the inside of the cap to This is a matter of special note because it does not cause substantial welding with the aluminum foil (3) and has the unexpected effect of not causing any trouble in opening the cap after sealing.

In the present invention, the polyethylene-based synthetic resin forming the cap is a hard one having a melting point (softening point) of 120 ° C. or higher.

The sealing member (5) placed on the container opening (1) retains hermeticity by the high-frequency heat treatment by welding the synthetic resin film (4) on the lower surface side to the container opening (1). To do. On the other hand, the aluminum foil (3) on the upper surface side can be easily peeled off by pulling up the pull tab knob (2).

The synthetic resin film (4) is provided with a star-shaped discharge hole in the center thereof so that the contents (eg, mayonnaise) can be discharged in a decorative manner, or a star-shaped perforation is formed. It may be

Further, as the seal member, a laminate material including various aluminum foils can be used in addition to the configuration shown in the drawings of the present invention. It is safe to use various heat insulating materials and non-heat conductive materials such as paper, cellophane paper, ceramics and high melting point resin films on the aluminum foil.

[0013]

[Effect of the invention]

 As described above, according to the present invention, the ring-shaped small projections are not provided on the top surface of the cap as is conventionally seen, and the top surface of the cap is annularly positioned at a position corresponding to the outer peripheral surface of the container opening. With a simple structure in which a groove is provided and the lower surface between the inner sides of the annular groove forms a stepped concave portion, sealing performance is ensured, and the top surface inside the cap and the sealing member are not welded. Therefore, it is possible to provide a new type of high frequency heat sealing cap that does not hinder the opening of the sealed cap.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a cap according to the present invention is screwed into a container opening.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a perspective view of a seal member.

[Explanation of symbols]

 (1) Container opening (2) Pull tab knob (3) Aluminum foil (4) Synthetic resin film (5) Seal member (6) Cap (7) Annular groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeo Kumada 2-1-12 Shimonoge, Shimonoge, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Knorr Foods Co., Ltd. (72) Kazumi Iijima 1-1, Suzuki-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Ajinomoto Co., Inc., Production Technology Laboratory

Claims (1)

[Utility model registration claims] 1. A polyethylene-based synthetic resin cap screwed into an opening above a screw thread of a synthetic resin container opening, wherein a position corresponding to an inner top surface and an outer peripheral surface of the container opening is substantially centered. A high-frequency heat seal, characterized in that an annular groove is provided, and a lower surface between inner sides of the annular groove is formed with a step lowering by 0.05 to 1 mm on the top surface side with respect to the outer lower surface. For cap