JPS5858221B2 - Blow-molded container opening edge processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for processing the opening edge of a blow-molded container, and more particularly to a processing apparatus for forming the opening edge of a blow-molded container into a folded edge.

FIG. 1 shows a container body 1 manufactured by the apparatus of the present invention containing frozen candy M, in which a deep cylindrical container body 1 made of a soft thermoplastic material such as polyethylene or foamed polyethylene has a folded line at the opening. 2, and after storing a frozen dessert M such as ice cream or sherbet in the container body 1, a lid 3 having a thermoplastic plastic layer 3a on the lower surface is heat-bonded on the folded line portion 2. It is what it is.

When eating this frozen dessert container, when the lid 3 is peeled off and the container body 1 is squeezed, the frozen dessert M is pushed out from the opening.
Frozen confectionery M that is pushed out by grasping the container body 1 with one hand
It is something that can be tasted directly.

The folded line portion 2 of the container body 1 is used to heat-bond the lid 3, and to prevent the lid from touching the opening of the container body 1 even if the lip comes into contact with the opening of the container body 1 when the ice candy M is eaten directly from the container body 1. This is to prevent damage to the

BACKGROUND OF THE INVENTION Conventionally, it has been known that blow molding is the most suitable method for producing deep containers of this type from thermoplastic materials.

However, it is also known that the blow molding method is unsuitable for molding complex shapes, and that it is impossible to mold the folded edges 2.

Therefore, the present invention provides an opening edge of a blow-molded container in which a container body with a straight opening is formed by a conventionally known blow molding method, and the opening of the container body can be made into a folded line part by secondary processing. The processing equipment was manufactured.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIG.

In Fig. 2, 10 is a machine stand, and on this machine stand 10 is a frame 14.
A guide rod 11.11 is installed vertically to hold the seat so that it can be raised and lowered.

Although not shown in the figure, this frame 14 can be manually installed.
Alternatively, it can be raised and lowered using the guide rods 11° 11 as a guide by an appropriate drive source such as an air cylinder or a crank mechanism.

At the lower side of the frame 14, a container body 1 is formed by blow molding and its upper part is cut off at a horizontal surface.
A ring portion 15 is provided which is inserted upside down, and the ring portion 15 is fitted upside down.
The lower end thereof projects from the lower surface of the frame 14 and has a U-shaped cross section 15a.

Note that by making the inner diameter of the ring portion 15 slightly smaller than the outer diameter of the fitting portion of the container body 1 when the container body 1 is fitted therethrough, the ring portion 15 can hold the fitted container body 1 so that it does not fall. There is no such thing.

Further, the upper side of the frame 14 has an opening 2a located at a position where, when the container body 1 is fitted into the ring part 15, the opening 2a protrudes further downward from the lower end cross-sectional U-shaped surface 15a of the ring part 15. A receiving plate 16 is arranged to receive and stop the bottom of the container body 1.

In the illustrated example, this receiving plate 16 has a fixed position adjustment screw 17
The lower surface of the receiving plate 16 is provided with a recess 16a into which the bottom of the container body 1 is fitted.

Furthermore, the lower part of the ring part 15 on the machine stand 10 has an inner periphery 13a of a size that can be fitted into the opening 2a of the container body 1, and a lower end part of the ring part 15 that has a wall thickness of the container body 1. A heater 12 is arranged having a groove ring 13 having a U-shaped cross section and having a size that allows the heater to be inserted with a sufficient margin.

Although the internal structure of the heater 12 is omitted in the figure,
It is a thermal theory that the heater 12 can heat the opening 2a of the container body 1 to a temperature below melting temperature by supplying energy such as electricity.

Note that 14a in the figure indicates a key that guides the receiving plate 16 in the vertical direction.

Next, the operation of this embodiment will be explained.

In this device, the heater 12 is heated to a desired temperature, and the fixing position of the receiving plate 16 is adjusted.

The fixing position of the receiving plate 16 is determined according to the length of the container main body 1, and as shown in the figure, the container main body 1 is turned upside down and inserted through the ring part 15, so that the bottom part of the receiving plate 16 is in contact with the receiving plate 16. At this time, the tip of the opening 2a of the container body 1 is connected to the ring portion 15.
This is done so that it protrudes further downward from the lower end cross-sectional U-shaped surface 15a.

As shown in the figure, when the frame body 14 is lowered after setting the container body 1, the opening 2a is first opened to the heater 1.
The opening 2a contacts the inner periphery 13a of the groove ring 13 of No. 2 and is heated and softened, and as the frame body 14 further descends, the opening 2a is
It is folded back along the inner surface of 3.

Then, the lower end cross-sectional U-shaped surface 15a of the ring part 15 is fitted onto the folded opening 2a as shown by the chain line, and the softened opening 2a is pressed against the inner surface of the groove ring 13 to form a shape. In this way, the folded line portion 2 shown in FIG. 1 is formed.

Incidentally, in the next step, the frame body 14 is raised and the container body 1 is replaced, thereby completing one process.

Since the apparatus for processing the opening edge of a blow-molded container has the above-described configuration and operation, it is possible to easily form the folded line portion 2 on the blow-molded container body 1 by secondary processing.

In particular, in the present invention, since the groove ring 13 of the heater 12 has a U-shaped cross section, the folding line part 2 can be formed simply by lowering the container body 1, and this folding line part 2 is formed between the groove ring 13 and the ring part. Since it is pressed by the U-shaped cross-sectional surface 15a of 15, a well-shaped object can be obtained.

Furthermore, the frame body 14 that holds the container body 1 has a frame shape so that the middle part of the container body 1 can be held in the hand, and it is easy to attach and detach the container body 1 to this device. Therefore, the heat dissipation effect is large, the folded line part 2 can be cooled in a short time, and even if the processing speed is high, there is little risk of deformation of the formed folded line part 2 due to residual heat.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example in which a container manufactured by the apparatus of the present invention is used as a container for frozen confectionery, and FIG. 2 is a cross-sectional view of the apparatus of the present invention.

Claims (1)

[Scope of Claims] 1. A guide rod 11.11 is provided on the machine base 10 to hold the frame 14 so that it can be raised and lowered, and the lower side of the frame 14 is molded by blow molding and its upper part is formed by blow molding. A ring part 15 is provided, into which the container main body 1 is inserted upside down, and the lower end of the ring part 15 protrudes from the lower surface of the frame 14 and has a U-shaped cross section 15a. The upper side of the body 14 is located at the bottom of the container body 1 at a position where, when the container body 1 is inserted into the ring portion 15, the opening 2a protrudes further downward from the lower end cross-sectional U-shaped surface 15a of the ring portion 15. A catch plate 16 that stops the catch.
is disposed on the lower part of the ring part 15 on the machine base 10, the inner periphery 13a is large enough to fit into the opening 2a of the container body 1, and the lower end of the ring part 15 has a U-shaped cross section. This apparatus includes a heater 12 having a groove ring 13 whose surface 15a has a U-shaped cross section and is large enough to be fitted with a margin beyond the wall thickness of the container body 1a.