JPH0723169B2 - Heat shrinkable lid and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat-shrinkable lid (hereinafter referred to as a shrink lid) and a method for manufacturing the same.

[Conventional technology]

In the shrink lid, as shown in FIG. 6, the skirt portion 2 of the lid 1 is longer than the skirt portion 4 of the container 3 (wider).
When the shrink lid 1 is heat-shrinked,
As shown in the drawing, the lower end of the skirt portion 2 of the lid 1 is adapted to wind the skirt portion 4 of the container 3 to fix the lid 1.

If the lid 1 is fixed in this way, it is necessary to cut it with scissors or the like when opening it, so it is usual to provide a notch at the lower edge of the skirt portion 2 in advance.

[Problems of the Invention] However, the lid 1 as described above is completed by forming a synthetic resin film or sheet into a molded product by a vacuum forming method or a pressure forming method, and then trimming a margin (excessive edge). A notch was formed on the skirt portion 2 of the finished product with a knife, but since the notch is linear, it becomes invisible due to heat shrinkage, or the vicinity of the notch becomes thick and easy to open. .

Further, in order to automatically form a notch with a blade, an automatic device for that purpose is required, which leads to an increase in cost.

Therefore, an object of the present invention is to provide a shrink lid in which a notch having an appropriate shape and size is formed and a method for manufacturing the shrink lid without requiring a special automatic device.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a skirt part that is provided around the top wall and has a notch at the lower edge of the skirt part. The margin is removed by trimming a molded product having a small recess on the back surface of the corner of the above, and at the same time a notch is formed in the skirt portion by the open end face of the small recess.

According to the method of the present invention, a heat-shrinkable film or sheet is formed to provide a skirt portion around the top wall, and the margin remaining on the periphery of the skirt portion and the back surface of the corner portion of the skirt portion. At the same time as the molding, a small recess is provided, the margin is trimmed, and a notch having a substantially end face shape of the small recess is formed in the lower edge of the skirt portion.

[Action]

Since a small recess that is recessed from the back side was provided at the corner where the skirt and the margin are continuous at the same time as molding, the skirt side end surface of this small recess is open, and therefore the margin is trimmed and removed. Then, the open end face becomes a notch.

〔Example〕

First, a molded product as shown in FIGS. 1 and 2 is formed from a heat-shrinkable film or sheet. This shrink lid molded article 10 includes a top wall 11, a groove 12 provided around the top wall 11, a skirt portion 14 hanging from a flat portion 13 provided on an outer wall of the groove 12, and a A margin 15 continuous with the skirt portion 14 is provided, and a small recess 16 is provided at a corner portion between the skirt portion 14 and the margin 15. This small recess
Reference numeral 16 denotes a vacuum forming or pressure forming mold provided with protrusions or recesses in advance, and is formed at the same time as the top wall 11 and the like,
The number, location and shape are selected appropriately. Also, the groove
12 is provided for reinforcement, but can be omitted.

The top wall 11, the groove 12, the flat portion 13, and the skirt portion 14 are portions that will become lids after trimming the margin 15, but the shape may be formed so as to correspond to the shape of the container.

As shown in FIG. 3 and FIG. 4, the small recess 16 has recesses in the corners of the skirt portion 14 and the margin 15 when viewed from the rear surface thereof. Has an open end face, and this end face shape is almost a notch shape. Therefore, depending on the shape of the notch you choose, a small recess
16 shapes may be appropriately selected. In the case of FIG. 3, the notch has a substantially triangular shape, and in the case of FIG. 4, it has a substantially oval shape. Of course, other shapes may be used. FIG. 5 shows one method of trimming the molded product 10. In the figure, 20 is a male blade and 21 is a female blade. As can be seen from the figure, when the male blade 20 descends, the margin 15 is cut and, along with it, the small recess 16
The part of is also cut off, and only the part of the lid falls into the female blade 21.

〔effect〕

According to the present invention, as described above, the notches are simultaneously formed in the conventional trimming process without providing a special notch forming device by simply providing the small recesses in advance at the time of molding the molded product for the shrink lid. Since this is advantageous in terms of cost, the shape of the notch can be easily tearable by properly designing the shape of the initial small recess.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a molded product for forming a shrink lid of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 and FIG. 4 are perspective views showing a small recess, and FIG. FIG. 6 is a sectional line diagram showing a trimming process, and FIGS. 6 and 7 are sectional line diagrams showing a state in which a conventional shrink lid is covered on a container. 10 …… Shrink lid molding, 11 …… Top wall, 12 …… Groove,
13 …… Flat part, 14 …… Skirt part, 15 …… Margin, 16
…… Small recess, 20 …… Male blade, 21 …… Female blade.

Claims (2)

[Claims] 1. A skirt portion is provided around the top wall,
In the heat-shrinkable lid having a notch on the lower edge of the skirt, the notch removes a small recess provided on the back surface of the corner of the skirt and a margin remaining on the periphery together with the margin by trimming. A heat-shrinkable lid, which is formed when the heat-shrinkable lid is formed, and has a substantially end face shape of the small recess. 2. A heat-shrinkable film or sheet is formed to provide a skirt portion hanging down around the top wall, and a small recess is formed on the back surface of a corner remaining between the margin and the skirt at the periphery of the skirt portion. A method for manufacturing a heat-shrinkable lid, which is provided at the same time as molding and trims the margin to form a notch having a substantially end face shape of the small recess in the lower edge of the skirt portion.