JPS62158538A - Inward-curling container and its manufacture - Google Patents

Abstract

PURPOSE:To secure the seal width by providing a horizontal flange on the peripheral edge of a bottomed drum part, also forming a drooping flange so as to be continued to said flange, and moreover, curling a free end edge of the drooping flange to the inside. CONSTITUTION:Between an upper die 4 and a lower die 5, a horizontal flange 2 of a tray container is inserted and held, and also a side die 6 is made to abut on the outside periphery of a drooping flange 3. Subsequently, an annular curling die 8 provided with a curl forming part 7 is installed between the lower die 5 and the side die 6 and pushed upward. According to this method, a suffi cient seal width can be secured on the horizontal flange of the upper edge of the drum part for constituting the container. Also, a non-bending part which is apt to be subjected to a bending action at the time of curling working can be fixed exactly, therefore, the accuracy of the curl can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inward curling container in which the free end of a hanging flange is curled inward, and a method for manufacturing the same.

(Prior art) -a. In tray containers such as aluminum trays, from the viewpoint of appearance quality and safety, the periphery of the bottomed body having a mouth-shaped cross section is curled inward, and the edges of the periphery are curled inward. It is made so that it is not directly visible from the outside or comes into direct contact with people's hands and fingers.

(Problem to be Solved by the Invention) However, according to the conventional structure described above, the peripheral edge of the bottomed body is once bent downward and then further curled inward (toward the side approaching the body). However, when sealing the lid to the opening of the container, it is not possible to ensure a large sealing width or sealing area, resulting in a drawback that fluid sealing becomes difficult. Furthermore, if the seal width or seal area is small, there is no room to form an annular seal bead on the sealing surface of the container, and therefore a space for finger insertion cannot be formed between the container sealing surface and the lid. This has led to other problems, such as peeling off the sealed lid and using TNT.

Furthermore, in the conventional method of curling the upper edge of the body that forms the container body inward, it is difficult to fix the non-bent portion, which is susceptible to bending during curling, resulting in insufficient curling and failure. This resulted in inconveniences such as non-defective products being produced.

Therefore, the present invention was made to solve the above-mentioned problems of the conventional example, and its purpose is to provide a round curling container that can secure a sufficient seal width or seal area, and to provide a simple and easy-to-use container. To provide a method for manufacturing an internal curling container capable of forming an internal curl with high accuracy.

(Means for Solving the Problems) The internal curling container of the present invention having the above object includes a horizontal flange protruding along the periphery of the bottomed body, and
It is constructed by forming a hanging flange continuous with the horizontal flange, and further curling the free end edge of the hanging flange inward. On the other hand, in the method for manufacturing a spiral curling container according to the present invention, the upper and lower surfaces of the horizontal flange provided along the periphery of the bottomed body are fixed with both the upper mold and the lower mold, and the horizontal flange is fixed with both the upper and lower molds. Constructed by supporting the continuous hanging flanges from the outside, and then pushing up the curling mold that is in contact with the free ends of the hanging flanges to curl the free ends of the hanging flanges inward. has been done.

(Function) In the internal curling container of the present invention, since the horizontal flange is provided along the periphery of the body, this horizontal flange can be used as a sealing part for attaching the lid. , a sufficient seal width or seal area can be secured. Further, since the above-mentioned horizontal flange has a sufficient sealing width or sealing area, an arbitrary number of annular sealing beads can be provided on this horizontal flange.

On the other hand, in the method for manufacturing an internal curling container according to the present invention, a horizontal flange is provided along the periphery of the body, and a hanging flange formed continuously on the horizontal flange is curled inward. Since all of the non-bending parts that are easily subjected to bending action, that is, the upper edge of the body, the horizontal flange, and the upper edge of the hanging flange, can be fixed with mold parts, etc., it is easy to bend the part of the free end of the hanging flange that is to be curled. Become.

(Example) The present invention will be explained below based on the illustrated example.
In FIG. 1, reference numeral 1 denotes a bottomed body constituting a tray container, and a horizontal flange 2 is provided protruding from the upper edge of the bottomed body 1 along its entire circumference. This horizontal flange 2 has a sealing surface portion 2a with a predetermined width W, and has a width on which several annular sealing beads 2b, . . . can be formed if necessary. Reference numeral 3 denotes a hanging flange formed continuously with the horizontal flange 2, and the free end, that is, the lower end of this hanging flange 3 is curled inward (toward the body side of the container body) to form an internal curl 3a.

FIG. 2 shows an embodiment of the method for manufacturing an internal curling container according to the present invention. In this embodiment, the horizontal flange 2 of the tray container is placed between the upper mold 4 and the lower mold 5. While being held by sandwiching it, a side mold 6 is brought into contact with the outer periphery of the hanging flange 3. A curl forming part 7 is formed at the upper end thereof, that is, at the end that comes into contact with the free end of the hanging flange 3.
If an annular curling ring qg with side) to form internal curls 3a.

In this embodiment, the free end of the hanging flange 3 is curled inward by pushing the curling mold 8 upward, so the curl forming part 7 guides the bending direction of the free end inward. The arc part P of the upper opening
Moreover, the outer end P of the circular arc portion is offset downward from the inner end P2, and the outer end P1 starts on the outer circumferential plane of the curling mold 8.

(Effects of the Invention) Since the present invention has the above configuration and operation, a sufficient sealing width or sealing area can be secured on the horizontal flange at the upper edge of the body constituting the tray container.
Therefore, a large amount of adhesive or the like can be uniformly applied onto the flange, which not only prevents uneven sealing but also improves the sealing strength. In addition, since the seal width or seal area of the horizontal flange is large, it is possible to form multiple ring-shaped seal beads on the flange. A finger insertion gap is formed between the body and the horizontal flange, allowing the sealed lid to be easily peeled off.

Furthermore, since the non-bent portion, which is easily subjected to bending action during curling, can be securely fixed, it is possible to form internal curls with high precision using a simple method.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a sectional view of a spiral curling container, and Figure 2 is a sectional view of a curling device used in a method for manufacturing a spiral curling container. 3 is a sectional view of a container flange formed by the curling device, and FIG. 4 is a sectional view of a main part of a conventional tray container. Explanation of symbols 1...Bottomed body 2...Horizontal flange 3.
...Drooping flange 4...Upper mold 5...Lower mold
6... Curl forming part 8... Curling mold

Claims (2)

[Claims] (1) A horizontal flange is provided protruding along the periphery of the bottomed body, a hanging flange is formed continuous with the horizontal flange, and the free edge of this hanging flange is further curled inward. An inner curling container. (2) The upper and lower surfaces of the horizontal flange provided along the periphery of the bottomed body are fixed with both the upper and lower molds, and the hanging flange provided continuously with the horizontal flange is secured from the outside. A method for manufacturing an inner curling container, which comprises supporting the hanging flange and then pushing up a curling mold which is brought into contact with the free end of the hanging flange, thereby curling the free end of the hanging flange inward.