JPH05178331A - Heating device for molding film - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a trouble owing to expansion and contraction of a film by a method wherein a heating device for molding a film is partitioned into a molding heating part for a part in the vicinity of the position of the pocket molded part of a package film and other non-molding heating part than the molding heating part, which are formed by means of materials different in heat conductivity. CONSTITUTION:After a package film 11 fed from a feed roll K is heated by a heating device A, a pocket 12 is molded by a molding device B. After each pocket 12 is filled with a content, such as a drug by a filling device C, a sealing film 14 fed from a seal roll 13 is positioned facing the pocket 12 in a sealing device D, and sealing is performed in a way that the spot of other package film 11 than the pocket 12 is welded by a sealing heating device 19. In a device so formed, the heating device A has an outer peripheral surface partitioned into a molding heating part 16 in a range matching with the position of a mold cavity part 22 of the film molding device B and a non-molding heating part 17 matching with the position of other than the mold cavity 22. The molding heating part and the non-molding heating part are formed of materials different in heat conductivity, and temperature is increased by a heater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film forming heating device, and more particularly to a film forming package for medicines (hereinafter referred to as "PT").
(P)) which eliminates the inconvenience caused by the expansion and contraction of the packaging film in the apparatus.

[0002]

2. Description of the Related Art Generally, in a PTP device for chemicals and the like, various raw material films for packaging are continuously supplied, and a heating part-forming part-contents (object to be packaged) feeding part-seal part-slitting part-punching. This is carried out by a process of continuously passing (or partially intermittently operating) each device such as a part-winding part. In these processes, the seal part, the slit part, and the punching part need to be positioned surely at predetermined positions, and in order to produce an appropriate molded package product, the PTP is required.
It is an essential condition that the entire length of the packaging film that passes through each process of the device is always stable within a certain extension range so that no displacement occurs in each device.

In the PTP device, a polyvinyl chloride film (hereinafter referred to as "PVC film") is widely used because of its extremely excellent moldability, but the PVC film is regarded as one of the substances deteriorating the global environment. .. For this reason, there is a demand for a PTP device that also targets a polypropylene film (hereinafter referred to as a "PP film"), which is attracting attention as a molding film material that replaces the PVC film.

However, the PP film is still under development due to its extremely high thermal expansion and contraction compared to PVC film, and is still in the process of development.
The PTP device corresponding to the P film is in an unfinished state, and the PTP product using the PP film has not yet become popular. For example, in a PP film, in the initial stage of heating, shrinkage in the width direction first occurs remarkably, and the shrinkage becomes “lifting” or “wrinkle state”, resulting in poor contact between the film and the heating surface of the heating device.
The inconvenience arises that the formed part of the film cannot be heated reliably, and at the end of the heating, the film temperature rises and the elongation in the film flow direction remarkably occurs, causing a positional deviation between the heated part and the formed part. There is inconvenience.

As described above, with regard to the film forming heating device in the PTP device, problems have been pointed out due to the heat stretchability of the forming film and high heating, and means for solving these problems are necessary. Therefore, various techniques have been proposed in the past.

As these proposed techniques, for example, a plurality of heating rollers are arranged in series in order to prevent film breakage due to high temperature heating, and a plurality of annular grooves are formed on the outer circumference of the heating roller to form a heating roller. A technique in which the film and the film are in contact with each other except for the annular groove (for example, JP-A-63-550).
No. 33), a technique of heating the tape by a heating drum and passing the tape between the heating drum and the forming drum to form it immediately after heating (for example, Japanese Patent Application Laid-Open No. 2-109830), before sealing the packaged object. 1 to 2 around the recess
A technique for cutting or forming a horizontal cutout line with a few connecting portions left (for example, JP-A-57-1144).
No. 07), there is a technique of forming small holes at both ends of the film and forcibly sucking both ends of the film (Japanese Utility Model Laid-Open No. 59-136404) in order to prevent reduction in the width direction. Of the above proposed technologies, the technology of sucking the film with the suction ports at both ends of the heating roller can be evaluated in principle, but as a practical problem, it is still possible to prevent the film from floating and wrinkling at the center of the heating roller. Without
Since an incomplete heating portion may occur, a technique in which a suction port is arranged near each molding pocket is known.

[0007]

As mentioned above, PP
The film significantly expands and contracts due to heating and cooling, and due to the expansion and contraction of the entire film, a slight deviation occurs in the positional relationship between each device in the PTP device, making it difficult to manufacture a normal PTP product. In particular, a conventionally known heating device for PVC adopts a solid heating method in which a heating portion is integrally processed with, for example, a steel material or an aluminum material, so that excessive heat is supplied to the PP film and only immediately after heating. However, expansion and contraction also occur in the subsequent process, which is not applicable to the production of PTP products using PP film, which is a major obstacle to practical use. For example, among the above-mentioned proposed techniques, the technique of arranging the suction port in the vicinity of each pocket is based on the premise of a solid heating method on the whole surface, and the problem of excessive heating cannot be solved. It cannot be solved, and the problem of positional deviation of each device of the PTP device remains.

Further, among the above-mentioned proposed techniques, in the technique of forming a plurality of annular grooves on the outer circumference of the heating roller, by ensuring the contacted portion which does not come into contact with the heating portion in the film, it is certain that the film is stretched in the flow direction. However, it is possible to reduce the width a little, but with respect to the reduction in the width direction of the film, conversely, there is a problem that it is not possible to prevent the occurrence of floating and wrinkles by reducing the restricted contact surface that contacts the heating part. In addition, since there is a heated portion and a non-heated portion when the film is heated, there is a problem that it is not suitable for a PP film in which the expansion and contraction of the film accompanied by heating and cooling is remarkable. In this technique, for example, even if the suction port is provided near the pocket to prevent the film from shrinking in the width direction, the suction port cannot be provided due to the presence of the groove. Furthermore, in the technique of molding just after heating, in order to heat the entire film, the thermal expansion and contraction associated with heating and cooling is not solved in the same manner as in the past,
There is an inconvenience that positioning becomes difficult due to expansion and contraction of the PTP device with respect to the entire length of the film.

An object of the present invention is to heat a PTP device in consideration of the thermal expansion and contraction of various films, to suppress the shrinkage of the film in the width direction and the expansion in the flow direction, and It is to provide a film forming heating device capable of expanding and contracting within a predetermined range over the entire length. Another object of the present invention is to provide a PTP device in which P
Another object of the present invention is to provide a film-forming heating device which can be suitably applied to a PP film which has a remarkable thermal expansion and contraction as compared with a VC film.

[0010]

The heating device for forming a film of the present invention is a heating device for forming a film, which contacts a packaging film and heats the packaging film, wherein the heating film has at least two contact surfaces for the packaging film. Is formed into a molding heating section and a non-molding heating section by different materials having different thermal conductivity, and the molding heating section is formed of a high thermal conductivity material and is formed in the vicinity of the position of the pocket molding section of the packaging film. The non-molding heating part is made of a material having low thermal conductivity and is formed at a site other than near the position of the pocket molding part of the packaging film, and the non-molding heating is performed while adjusting the molding heating part to a molding suitable temperature. The temperature of the part is adjusted to a temperature lower than the moldability temperature.

It is preferable that the heating device comprises a drum-type heating device, a drum-type molding device is adjacent to the drum-type heating device, and a packaging film is sandwiched between them for heating and molding. is there.

[0012]

In the present invention, the packaging film contact surface of the heating device is divided into at least two kinds of materials having different thermal conductivities into a molding heating part and a non-molding heating part, and the molding heating part is made of a high thermal conductivity material. Formed in the vicinity of the position of the pocket molding portion of the packaging film, and the non-molding heating portion is formed in a portion other than the vicinity of the position of the pocket molding portion of the packaging film and is composed of a low thermal conductivity material, Since the temperature of the non-molding heating part was adjusted to a temperature lower than the molding suitability temperature while controlling the molding heating part to a molding suitability temperature, the heating device and the packaging film contact surface were in contact with each other over the entire surface, a so-called solid contact state. It is possible to secure the stability by applying tension to the entire film surface without applying film tension only to the molding heating part in the film width direction. It is possible. And in the molding heating part, the vicinity of the pocket molding part molded in the next step,
It is possible to heat to an appropriate molding temperature, and it is possible to adjust the temperature of the non-molding heating portion to a temperature lower than the molding suitability temperature except for the vicinity of the pocket molding portion. In this way, it is possible to differentially heat the packaging film surface by at least two temperature regions, suppress the shrinkage in the width direction with respect to the expansion and contraction of the packaging film, and suppress the stretch in the flow direction. It is possible to keep the elongation of the entire length of the packaging film within a certain range during the passage through the apparatus to the product punching portion after the filling and sealing.

The film elongation over the entire apparatus can be maintained within a certain range for various packaging films by simply presetting the required temperatures of the molding heating section and the non-molding heating section. Production can be performed without adjusting the positional relationship of each part every time the film is switched or replacing parts.

If a drum-shaped molding device is adjacent to the drum-shaped heating device, and a packaging film is sandwiched between them to perform heating and molding, the heating is performed immediately after heating, so that the heating temperature can be lowered, This makes it possible to reduce the influence of thermal expansion and contraction.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, etc. described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1 to 3 show a first embodiment of the present invention. The PTP device S of this example is, as shown in FIG.
From the supply roll K of the PP film 11, the heating device A-the forming device B-the content filling device C-the sealing device D-the slitter device E-the punching device F-the punching remainder winding device G and the like.

The PP film 11 supplied from the supply roll K is heated by the heating device A and the pocket 12 is formed by the forming device B, as shown in FIG. Next, the pocket 12 is filled with contents such as medicines by the contents filling device C, and then sealed by the sealing device D. In the sealing device D, the sealing film 14 supplied from the sealing roll 13 is made to face the pocket 12, and the PP film 1 other than the pocket 12 is heated by the sealing heating device 19 or the like.
Weld and seal at location 1. Next, a slitter (not shown) is formed around the pocket 12 by the slitter device E, and then punched by the punching device F in accordance with a predetermined width and amount. For the remaining punched parts,
It is wound by the winding device G. Each step of each device other than the heating device A and the molding device B in the PTP device S is similar to the conventionally known technique.

The heating device A of this example is a drum type and is rotatably attached by a rotary shaft 15. The outer peripheral surface of the heating device A which is in contact with the PP film 11 has a film molding described later. , Of the apparatus B, and the non-molding heating part 17 which is aligned with a position other than the molding cavity 22, are heated by the heat generating parts 16, 16 ,. It is partitioned by materials having different conductivity. Molding heating part 16,1
, ... are arranged in a plurality of rows so as to be in contact with the pocket forming portion 11a formed continuously in the longitudinal direction of the PP film 11, and the forming heating portions 16, 1
The material of 6 ... is made of a highly heat-conductive material that is highly heated, and the non-molding heating portion 17 is made of a low-heat conductive material that is lowly heated. As the high thermal conductivity material, for example, aluminum, copper, or an alloy-based material thereof can be used. As the low thermal conductivity material, for example, a heat-resistant resin such as a fluorine resin, or a metal surface-coated with these resins can be used. Can be configured.

.. and the non-molding heating section 17 are supplied by using a well-known technique such as a heater or hot / cold water piping. Molding heating part 16 and non-molding heating part 17
A temperature sensor (not shown) or the like is provided in the temperature sensor, and the temperature is adjusted by a known or well-known temperature adjusting mechanism (not shown) based on the information from the temperature sensor.

Molding heating parts 16, 1 of the heating device A of this embodiment
On the contact surface with the PP film 11, 6, ... are scattered as shown in FIG. 2, but the internal structure structurally causes the root portion 18 formed at the outer peripheral position of the rotary shaft 15. ,
Each of the molding heating units 16, 16, ... Is formed as an integrated communication unit.

The heating device A is arranged adjacent to the film forming device B which is the next step. Like the heating device A, the film forming device B of this example is a drum-shaped mold and is rotatably attached by a rotary shaft 21.
Molding cavities 22, 22, ... Are formed in a plurality of rows on the outer periphery so as to correspond to the pocket molding portion 11a of the PP film heated by the heating device A. It is configured to rotate in parallel with and opposite to the rotation axis 15 of the. Molding heating parts 16, 16 of the heating device A, and molding cavity parts 22, 2
2, ... Are formed so as to correspond to each other. Then, the PP film 11 is sandwiched between the peripheral surface of the film forming apparatus B and the peripheral surface of the heating apparatus A.
The other structure of the film forming apparatus B is the same as the conventionally known structure.

In the above-mentioned embodiment, each molding heating section 16, 1
Although an example in which 6, ... Are formed integrally with the root portion 18 in communication with each other has been shown, these forming and heating portions 16, 16 ,.
You may connect and form it for every several block.

The operation of the heating device A having the above construction will be described. The PP film 11 supplied from the supply roll K to the heating device A is brought into contact with the outer peripheral surface of the heating device A to heat the entire PP film 11. However, the outer peripheral surface of the heating device A is made of materials having different thermal conductivities.
, And the non-molding heating part 17 are formed, and the molding heating part 16, 1 is a part where the pocket 12 is molded.
In 6 and so on, the pocket molding portion 11a of the PP film 11 is heated to a temperature suitable for the molding temperature. At the same time, the non-molding heating part 17 is heated at a temperature lower than the molding temperature. Therefore, the temperature difference between the molding heating unit 16 and the non-molding heating unit 17 can be adjusted as desired. Further, the molding heating units 16, 16, ... Make the PP film 11 a moldable temperature, and the non-molding heating unit 17 uses the molding heating unit 1.
6, 16, ... Since the temperature is adjusted to a lower temperature, the thermal expansion / contraction width can be made smaller than the thermal expansion / contraction width caused by heating the entire surface of the PP film 11.

These will be described with more specific numerical values. For example, the elongation in the flow direction of the PP film in the forming and heating unit immediately after heating is 1.1 to 1.5% when compared with the heating technique using a grooved heating roller which is one of the conventional techniques.
The flow direction elongation was about 0.7 to 0.8
I was able to reduce it to%. This corresponds to an actual size of about 4 mm, whereas the elongation is about 1.7 mm. For this reason, for example, in a PTP product used as a medicine, in which the distance between the sealed portions between the formed pockets is about 3 mm at the minimum, when the elongation of 4 mm occurs as in the above-mentioned conventional technique, the heating position becomes Poor pocket molding occurs because the molding position does not match.
According to the embodiment of the present invention, as described above, it is possible to suppress the elongation in the flow direction to about 1.7 mm in actual size, and it is possible to reliably hold the expansion within the minimum gap of about 3 mm of the sealing portion. it can.

As described above, on the outer peripheral surface of the heating device A, the forming and heating parts 16, 16, ...
.. and by configuring the non-molding heating part 17,
In the process from the film supply, which is the starting process of the P device, to the punching device F through the heating device A, the molding device B, the content filling device, and the sealing device D, the total length of the PP film 11 during the passage processing in each device. Can be suppressed within a certain range, and the influence of thermal expansion and contraction of the PP film 11 can be extremely eliminated.

FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, the heating device A is a flat plate type embodiment. In this example, the configuration and operation are exactly the same as the drum shape of FIG. 2 except that the heating device and the molding device are flat plate-shaped, so the same reference numerals are given and the description thereof is omitted.

Further, in each of the above-mentioned embodiments, the molding heating section 1 is used.
Since 6 and the non-molding heating part 17 are formed on the same surface,
It is possible to appropriately arrange the suction port in the portion of the non-molding heating portion 17, and by arranging the suction port in the portion of the non-molding heating portion in this way, the reduction in the width direction of the film is more effectively regulated. It becomes possible. A conventionally known technique is used for the above-mentioned configuration related to the suction port.

[0028]

As described above, according to the present invention, it is possible to differentially heat the surface of the packaging film by at least two temperature ranges, and the expansion and contraction of the packaging film can be controlled by heating and filling. The expansion of the entire length of the packaging film during the passage through the equipment to the product punching part after sealing can be kept within a certain range, and the positional relationship of each part of the molding and packaging machine can be adjusted every time the film is switched, or parts can be replaced. Production is possible without

Further, not only the new machine but also the existing molding and packaging machine can be dealt with by only changing the heating device to the device according to the present invention. Therefore, even if the packaging film manufacturer or the film standard is different, The troublesome switching and adjusting work can be effectively utilized, and a epoch-making effect can be brought about in the reduction of the production cost.

When the drum-shaped heating device is adjacent to the drum-shaped heating device and the packaging film is sandwiched between them to perform heating and molding, the heating is performed immediately after heating, so that the heating temperature can be lowered, This makes it possible to reduce the influence of thermal expansion and contraction.

[Brief description of drawings]

FIG. 1 is a general configuration diagram of an entire PTP molded package according to a first embodiment.

FIG. 2 is a configuration diagram showing a heating unit in FIG.

FIG. 3 is a general configuration diagram of an entire PTP molded package according to a second embodiment.

FIG. 4 is a configuration diagram showing a heating unit in FIG.

[Explanation of symbols]

 A film forming heating device B film forming device SPTP device 11 packaging film (PP film) 11a pocket forming part 12 pocket 16 forming heating part 17 non-forming heating part 22 forming cavity part

Claims (2)

[Claims] 1. A film forming heating device for heating a packaging film by contacting the packaging film, wherein the packaging film contact surface of the heating device is made of at least two kinds of materials having different thermal conductivities from the forming heating part and the non-forming part. The heating section is formed by partitioning, the forming heating section is formed of a material having high thermal conductivity and is formed in the vicinity of the position of the pocket forming section of the packaging film, and the non-forming heating section is made of a material having low thermal conductivity. And formed in a site other than the vicinity of the position of the pocket forming part of the packaging film, and the temperature of the non-molding heating part is adjusted to a temperature lower than the molding suitability temperature while controlling the molding heating part to a molding suitability temperature. A film forming heating device characterized by. 2. The heating device comprises a drum-type heating device, a drum-type molding device is adjacent to the drum-type heating device, and a packaging film is sandwiched between them for heating and molding. The film forming heating apparatus according to claim 1.