JPS60172604A - Method of molding vessel with cover - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves filling a container such as a plastic tray with contents, then continuously heat-sealing the cover film and forming the container by die-cutting or the like without moving the container by a conveyor or the like. The present invention relates to a method for forming a container with a lid.

Conventionally, it is made by sealing a lid on a tray filled with contents.
Containers with g-fittings are known, and according to the conventional method for forming such containers with lids, contents are filled into a 1-lay, and then the 1-lay is conveyed by a conveyor. A known technique is to apply heat and pressure using a heater block of a heat sealing device to seal and seal a film on the edge of the tray.

However, in this method, filling, pressurizing, and heating are performed while avoiding stopping the flow of the tray, which necessitates intermittent arrival work in which the movement of the conveyor is temporarily stopped.
As a result, tensile loads are applied to the conveyor belt when the conveyor is stopped and driven, resulting in mechanical strain.
In addition, the filled contents may scatter due to vibrations caused by the conveyor stopping, and the adhesion strength between the tray and the film may decrease, causing instability, resulting in variations in the arrival process, and making it difficult to maintain the sealing required. This was causing problems in the maintenance of

Furthermore, a plurality of film leaves 2 as shown in FIG.
．． 1 = Container 1 (see Figure 2)
In this case, it is necessary to adjust the continuous film leaves while maintaining a constant tension so that the pick piece 4 is in a predetermined position on the edge of the tray opening. , and J: are sealed in a way that prevents the opening function of the flexible piece, and a considerable load is generated during sealing, pressurization during punching, and driving the tray conveyance, so the sealing mechanism, Certain restrictions were added to the strength of the hitting mechanism, other devices, and trays, and the devices and systems had to be made larger, resulting in a lack of versatility and economy.

In addition, in the case of intermittent work, a pre-process using special equipment and means is required to feed the trays to the tray transport conveyor, and it is especially difficult to adjust the timing of the processes before and after the sealing process, and the film that is to be sealed is often It was causing wrinkles. This seems to be due to a problem in maintaining the tension of the sealing film. Furthermore, in order to increase the speed, −
It is necessary to increase the number of 1-lays to be sealed at a time, which requires increasing the conveyor space and increasing the size of the heat sealing means and punching means.

The present invention improves the conventional intermittent container forming method as described above and provides a method in which a series of container forming operations including sealing operations can be performed continuously and at high speed. That is, while moving the container at the top end filled with contents and the IBM film in parallel, the container and the covering film are continuously sealed by heat sealing means that moves in synchronization with the movement. A method for forming a covered container, characterized in that the upper end opening of the container is closed, and then covered by a rotary set of punching means. Let's explain by following an example.

As shown in FIG. 3, a flanged tray 3 made of plastic or the like filled with contents is continuously conveyed by a chain with a clamp. In addition, the cover material to be sealed to the tray is prepared in advance by winding. This material for the cover is made by first preparing two rolls of continuous films A and B of a predetermined width wound on a roll, and then attaching a connected tab piece to the end side of the continuous film unwound from one roll 5. The lower surface near the edge to which this tab is attached is superimposed on the edge of the continuous film B that is fed out from the other roll 6, and heat-sealed as necessary to form a continuous film. Cover 7
Form it. The formed cover 7 is supplied to heat sealing means 8, which will be described later. Note that the cover may be continuous or leaf-like.

Next, when the tray 3 that has been continuously moved by the container conveying means reaches the position of the follow-up type heat sealing means 8, it is pressed from above the cover film supplied by the sealing means 8, and in this state, the tray 3 is conveyed one tray. 3 and the continuous cover 7, and then cooled and sealed as necessary. In this way, a continuous body 11 of covered containers is formed. The trays on which the sealing work has been completed are sequentially punched together with the film into a predetermined shape by a rotary die to form individual covered containers 1, and then discharged by another conveyor or the like. The remainder of the punched continuous cover is discharged outside the machine. The heat sealing means 8 used in the arrival process is a circulation Ia4R system in which a plurality of sealing blocks are successively installed and rotated, and these seal blocks follow the container for a certain distance in synchronization with the timing of conveyance of the tray. After completing the work, the robot detaches from the tray, moves backwards horizontally, and returns to its original position.

Even while the previous seal block is performing the sealing completion operation, the subsequent block starts sealing, and the sealing operation is performed continuously. The circulation speed of the block corresponds to the conveyance speed of the tray and the feeding surface of the covering film. In order to seal the grip piece 4 of the cover film at a predetermined position, the film is fed out and the film is detected by a photocell, the position of the grip piece is confirmed, and the speed is adjusted to correspond to the container conveyance speed, and the heat seal is applied. supplied to the means.

According to this method of forming a container with a lid configured as in J: U, the sealing between the tray and the lid is not performed intermittently but is performed while the lid is running, so the sealing operation is extremely smooth.
The sealing strength is uniform and the quality is improved without causing vibrations due to load fluctuations on the cover or tray.In addition, there is no accident such as the contents spreading, and it is possible to speed up the pricking operation. .

As described above, the present invention improves and stabilizes the sealing accuracy and continuously performs a series of operations for forming containers, thereby saving labor, streamlining the process, and increasing processing speed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory perspective view showing a lid, FIG. 2 is an explanatory perspective view showing a container with a lid, and FIG. 3 is an explanatory view of step J showing the forming process of the container with a lid of the present invention. 1... Container with cover 2. 2'... Cover 3... Tray 4... Pick piece A... Continuous film B...
- Continuous film 5...One roll 6...Other roll 7...Continuous cover 8...Heat sealing means 11...Continuum of container with cover r [Applicant: Kyodo Printing Co., Ltd. Agent] Osamu Kawai, Private Patent Attorney

Claims (2)

[Claims] (1) While moving the container at the upper end filled with contents and the covering film in parallel, the container and the covering film are continuously connected by a heat sealing means that moves in synchronization with the movement. A method for forming a container with a cover, characterized in that upon arrival, the upper end opening of the container is closed, and then the containers with a cover are separated into individual containers with a rotary set of punching means. (2) The heat sealing means seals the covering film in synchronization with the feeding of the N-lidding film and in parallel movement in synchronization with the movement of the container. Method for forming the container with a lid described.