JPS6294524A - Method of heating film in blister packaging machine - 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 Field of Industrial Application The present invention is used in a blister packaging machine that uses a resin film such as a polypropylene film or a PVC film to package articles such as medicines, in which both sides of the film are uniformly heated. , and relates to a film heating method in a blister packaging machine that can accurately control the temperature and heat at a stable temperature even at the start. In a blister packaging machine that heats a long resin film that is fed out and then shapes it to package a desired item, a flat heating plate is installed horizontally as a heating means for heating the resin film, and is placed vertically. The film is passed between opposing heating plates to perform desired heating, and immediately after heating, it is molded using a mold. Therefore, a mold is disposed adjacent to and in the lateral direction of this heating plate. Furthermore, in order to eliminate distortion of the film after heating and forming, it is desirable to cool the film immediately after forming, and therefore a cooling roll is provided in contact with the mold.

If the heating plate, mold, and cooling roll are arranged in a horizontal line, the overall length of the packaging machine becomes long, and the horizontal arrangement of the heating plate causes uneven heating temperature of the film heated by the heating plate. There are various possible causes for this. For example, the heated air between heating plates arranged vertically opposite each other is released into the outside air at the ends of the heating plates, but the air in the center of the heating plates is not exhausted and accumulates inside. Therefore, even if they are on the same heating plate, there will be a difference in heating temperature locally, and the temperature in the center of the heating plate will be higher than in the surrounding area. In addition, due to the movement of the film between the upper and lower heating plates, the air flow is slightly disturbed due to the sagging of the film, causing temperature fluctuations, and natural convection cools the top surface of the film while heating the bottom surface. Non-uniformity of heat occurs between the upper and lower surfaces of the film. Furthermore, the heating temperature differs between the top and bottom of the heating plate. This is because the upper heating plate generally has a higher temperature than the lower heating plate.

In addition, not only will the heating temperature of the film become uneven, but when the packaging machine is temporarily stopped for reasons such as changing the film, taking a break, or troubles occur in post-processing, the upper and lower heating plates are open, but the heating Since the heater on the board is in a heated state, if the packaging machine is stopped for a long time, the radiant heat will heat the film, softening it and causing it to sag.
As a result, the film may sag and come into contact with the lower heating plate and melt, rendering it unusable.

Furthermore, the air flow between the upper and lower heating plates changes drastically between when the packaging machine is stopped and when it is running. For this reason, even if the packaging machine is restarted, it takes a considerable amount of time for the film heating to stabilize, resulting in increased film loss, shortened actual working time, and reduced production efficiency. There are drawbacks.

No matter how accurate the temperature control is, it is difficult to eliminate the non-uniformity of the heating temperature due to the above-mentioned causes. In particular, considering the properties of PP film, it is desired that this heating temperature be made uniform.

Solution to the problem Polypropylene film - The film is sequentially unwound from a film roll containing a resin film such as PVC film, and is passed through a guide roller that adjusts the tension, and then the film is rolled on both sides of the film in the film feeding direction. The film is inserted between heating means arranged vertically or inclined at a certain angle from the horizontal so as to face each other, and the film is heated uniformly from both sides to the desired temperature. After molding in a mold adjacent to the heating means, the film is immediately cooled and sent. Cool with rollers. By arranging the heating means vertically or tilted at a certain angle from the horizontal, the temperature of the heating plate on both the left and right sides of the film is made uniform, the film is fed without sagging, and the heating means is kept open even when film feeding is stopped. The air flow inside the heating means prevents the temperature from building up in the heating means.

Example The present invention will be described below based on embodiments shown in the drawings.

In the figure, R1 and Rz are roll films containing a resin film F such as polypropylene or PVC, and the film F unwound from this roll film R1 or R2 passes through a stepped roller 1 and its tension etc. are adjusted. Thereafter, it is supplied to the next heating means 3 by the guide roller 2. This heating means is arranged parallel to the feeding direction of the film, and in order to make the heating temperature of the heating means uniform, the film is tilted more than horizontally, but preferably vertically or close to vertically. They are provided so as to face both sides of the film F at the location where the film F is transported. The flat heating plates 3a, 3a provided on both sides of the film form a pair of both sides of the film, that is, two on the left and right sides, and the heating plates 3
The heating plates 3g and 3a should be close to each other when heating the film, so that they are closest to the film and heated to the desired temperature, and when the film is being fed, they should be opened a little more than this. This creates a small gap between the film and the heating plate, and when the film is stopped, for example when trouble occurs in the post-process, or when the roll film is replaced, the heating plate 3a and 3σ are widest and separated from the film surface. Although not shown, the heating plate is equipped with an opening/closing mechanism. The opening/closing mechanism of this film heating means may be a cam type, a cylinder type, a link type, or any other conventionally used mechanism.

In such a position where the film is transported vertically or nearly vertically, if the heating means is placed facing both sides of the film, the film will sag even when the film is being fed or stopped. Therefore, the air flow caused by the film being transferred between the opposing heating plates is not disturbed, and this air flow matches the film feeding direction, and furthermore, this air flow is directed upward from the bottom of the heating plate and heated. Temperature never builds up on the board. Furthermore, even if there is a slight temperature difference between the upper and lower parts of the heating plate due to air flow, the same temperature can be maintained if the left and right heating plates are in the same position, so it is possible to maintain the same temperature on both sides of the film. Both sides are heated to the same temperature, and the temperature can be easily controlled.

The film F heated to a desired temperature by the heating means 3 is heated to a mold 4 which is provided very adjacent to (close to) the heating means 3.
It is molded into the desired shape. This mold 4 is used to mold the film by sandwiching it from both sides, and the male and female molds of this mold open and close in synchronization with the feeding of the film.The opening and closing movements of each mold and the heating plate The opening and closing movements in between are synchronized. After the film is heated and formed in this manner, it is immediately cooled. This is because polypropylene films and the like tend to shrink locally when heated to the molding temperature. In order to prevent this, the heated film is cooled immediately after molding, and the cooling feed roller 5 is disposed close to the mold.

The formed film F is then transferred to an opposing sealing roller 6.
However, before reaching the seal roller 6, the desired article is supplied to each recessed portion of the film by the article supplying device 7. And between the sealing rollers 6 and 6, there is a film F whose recesses are filled with the article, and an aluminum foil roll AR.
After supplying the aluminum foil A which is rolled out from above, and adhering or pressing the aluminum foil to seal the recessed part of the film, this sealing film is then cooled with a cooling roll 8,
After passing through a step roller and, if necessary, a slitter 10° stamping unit) 11'', it is fed to a punching unit) 12, where it is punched sheet by sheet, and the product and scrap are passed through a product chute 13 and a scrap chute 14, respectively. so that it can be separated and taken out.

Effects of the Invention According to the present invention, heating means are disposed opposite both sides of the film to heat the film when the film is being transported in a vertical, nearly vertical, or inclined position. , the airflow is constant from the bottom to the top of the heating means, so there is no temperature fluctuation, and even though there is a temperature difference between the top and bottom of the heating plate, there is no sudden temperature rise in the center.
The temperature on the left and right sides is uniform, and it is easy to control the temperature, and the film is less likely to sag.At the same time, the air flow in the heating means at the time of starting is the same as during operation, so you can simply control it with a constant temperature rise curve. It has advantages such as being able to set a predetermined stable temperature and eliminating film loss.
”

[Brief explanation of drawings]

FIG. 1 is a schematic diagram, FIG. 2 is an explanatory diagram showing airflow, FIG. 3 is an embodiment diagram, and FIG. 4 is an explanatory diagram of a known example. F is a resin film, R1 and R2 are roll films, 1 is a stepped roller, 2 is a guide roller, 3 is a heating means, 3' is a heating plate, 4 is a mold, 5 is a cooling feed roller, 6 is a seal roller , 7 is a packaged object supply device, 8 is a cooling roller, IO
is a slitter, 11 is a stamp unit 7), 12 is a punching unit, and 13 is a product chute.

Claims (1)

[Claims] At a position where the film unwound from the roll film is transported vertically, nearly vertically, or inclined at a certain angle from horizontal, a heating means that moves toward and away from both sides of the film is arranged to maintain a stable temperature. A method for heating a film in a blister packaging machine, characterized in that it can be controlled.