JPH046010A - Packaging machine and bag-making machine - Google Patents

Abstract

PURPOSE:To obtain a packaging machine which performs packaging with high strength by heat-sealing the same spot assuredly by a method wherein a first end seal to perform first heat-seal on a moving means, a second end seal to perform second heat-seal at the first sealed part, and a cutter to cut the sealed part are provided. CONSTITUTION:When an article A moves on a transfer means 1, negative pressure is added to the article A by a suction mechanism 3, and the article is adhered on a transfer means 2. Therefore, while the article is moving on the transfer means, even if thermal shrinkage is generated on a packaging film by being heat-sealed, or movement accompanied with the shrinkage is generated, the carrying position in the moving direction does not change. For this reason, a second heat-seal 52 can be accurately lapped on a first sealed part S1 sealed by a first end seal 11. By lapping heat-seals accurately on the same spot this way, hard to break heat-seal with sufficient strength can be performed. If the sealed part is cut by a cutter 17 after completing heat-seal by a second end seal 14, an article individually packaged by a synthetic resin film (f) can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packaging machine and a bag making machine. More specifically, the present invention relates to a packaging machine that wraps comparatively small and lightweight articles such as sanitary products into individual bags using synthetic resin film, and a bag making machine that makes bags using synthetic resin film.

[Prior Art] Conventional packaging machines cover a large number of articles in an envelope-like manner with a synthetic resin film while continuously feeding them, heat-seal the film between the individual articles, and then cut the sealed portions. was configured to do so.

However, according to the conventional packaging machine, the sealing part is fused by only one heat sealing, so there is a problem that the strength is weak and it is easy to tear.

Particularly, when the article is a sanitary product, there is a sanitary problem, and tearing of the seal has been considered an issue that must be solved. Incidentally, the above-mentioned problem is the same when making bags made of synthetic resin film.

Incidentally, although it has been previously assumed that repeating heat sealing twice would increase the strength of the sealed portion, it was thought that this method would be difficult to adopt in practice.

This is because once heat-sealed, the synthetic resin film shrinks due to the heat, or the slight movement of the film at that time may cause the article to be misaligned on the transport route, and the same place must be heat-sealed a second time. This is because there was a problem that it could not be done.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a packaging machine and a bag-making machine that can reliably heat-seal the same place and perform packaging with high strength.

[Means for Solving the Problems] The present invention is a packaging machine that wraps a large number of articles one by one with a synthetic resin film, and sequentially sends a large number of articles covered in an envelope shape with a synthetic resin film. a transporting means; a suction mechanism that applies negative pressure to the article moving on the transporting means and brings it into close contact with the transporting means; a first end seal that performs a first heat seal on the transporting means; The present invention is characterized by comprising a second end seal that performs a second heat seal on the first seal portion, and a cutter that cuts the sealed portion.

Furthermore, the present invention can be used as a bag making machine as is by folding the synthetic resin film into an envelope shape and supplying it to the transport means.

[Function] In the present invention, when the article moves on the transfer means, negative pressure is applied by the suction mechanism, so that the article comes into close contact with the transfer means. Therefore, even if the packaging film shrinks due to heat sealing or moves due to shrinkage while the article is moving on the transport means, the transport position in the moving direction does not change. Therefore, the second heat seal can be accurately overlapped with the first seal portion sealed with the first end seal.

By overlapping the heat seals in exactly the same place in this way, it is possible to achieve heat seals that have sufficient strength and are difficult to tear.

After heat-sealing with the second end seal, the sealed portion is cut with a cutter to obtain articles wrapped one by one with a synthetic resin film.

The above operation is the same when making bags made of synthetic resin film.

[Example] Next, embodiments of the present invention will be described based on the drawings.

The embodiment described below is an apparatus for packaging articles such as sanitary napkins with a synthetic resin film using a rotating drum as a transfer means.

In FIG. 1, 1 is a rotating drum. As shown in FIGS. 2 and 3, this rotating drum 1 has a large number of suction holes 3 drilled in the drum surface 2.

The suction hole 3 communicates with a communication hole 5 formed in the drum wall 4. On the other hand, a guide block 6 is positioned on the side surface of the rotating drum 1 in an airtight manner as shown in FIG. 3, and a circular arc-shaped ventilation hole 7 is formed in the guide block 6. The formation range of this vent hole 7 is the range from when the article is fed into the first end seal 11 to when it is taken out through the second end seal 14 and the cutter 17, as shown by the arrow θ in FIG. A known vacuum pump P, vacuum fan, or the like is connected to the ventilation hole 7. The suction mechanism configured as described above allows negative pressure to be applied to the drum surface 2 of the rotating drum surface 1.

Moreover, as shown in FIGS. 2 and 3, the rotating drum 1 has
A heater 8 is built-in. The heater 8 is used to heat the drum surface 2 for heat sealing, and any known heater such as an electric heater may be used as appropriate. Reference numeral 9 denotes a slip ring attached to the spindle lO in order to energize the heater 8.

In FIG. 1, 11 is a first end seal, which has a built-in roller 12 as shown in FIG. 5, and a push plate 13 is attached to the roller 12. A cartridge heater 16 is built into the push plate 13. Reference numeral 14 denotes a second end seal, which is also provided with a roller 15 with a push plate having the same structure as that shown in FIG.

A cutter 17 has a built-in roller 18 as shown in FIG. 6, and a blade 19 is attached to the roller 18.

The first end seal 11 and the second end seal 12 are
In both cases, each time the roller 12.15 rotates once, the push plate 13
presses the packaging film onto the drum surface 2, and at that time,
Heat sealing can be performed using the heat of the cartridge heater 16.

Further, the cutter 17 is configured such that a blade 19 cuts the packaging film on the drum surface 2 every time the roller 18 rotates once.

Next, the mechanism related to the process before the sealing process will be explained.

A feed belt 21 is provided at the left end in FIG.

An article to be packaged, for example, a sanitary napkin A, is sent by this feeding belt 21. 22 is a sailor which folds the synthetic resin packaging film f sent from below into an envelope shape and covers the sanitary napkin A.

Reference numeral 23 denotes a center seal, which heat-seals both edges of the packaging film f overlapped at the center by the sealer 22. A press belt 24 presses the sanitary napkin A wrapped in the packaging film f between it and the bed 25, and discharges internal air from the envelope-shaped film f. 2
6 is a guide roller.

Next, a mechanism related to the subsequent process of the sealing process will be explained.

In FIG. 1, 31 is a vacuum drum, and 32 is a vacuum belt. As shown in FIG. 7, the vacuum drum 31 and vacuum belt 32 are each provided with a large number of suction holes 33 and 34. The inside of the vacuum drum 31 is constantly kept under negative pressure by a known vacuum pump P or the like. Therefore, as shown in Figure 1,
The sanitary napkin A is sucked onto the vacuum drum 31, separated from the rotating drum 1, and fed by the vacuum belt 32. 35 is a vacuum pock, the surface of which has a large number of suction holes. Further, 36 is a belt having a large number of suction holes similar to the vacuum belt 32. The sanitary product A sent from the vacuum drum 31 is sent to the next process by the vacuum belt 36.

Next, the packaging operation using the apparatus of this embodiment will be explained based on FIGS. 1 and 8.

■=First, the unwrapped sanitary product A is sent to the sailor 22 by the feed belt 21.

■: At Sarah 22, the packaging film f that is supplied is
This wraps the sanitary product A into an envelope shape.

(2): The center seal 23 heat-seals the center of the packaging film f folded into an envelope shape. This seal portion is designated by the symbol SC.

(2) The packaging film f and the sanitary product A are compressed by the nibbles belt 24, and the air inside the film is discharged.

■=When sanitary product A passes under the guide roller 26,
It is attracted to the drum surface 2 of the rotating drum 1 by a suction mechanism. Therefore, the sanitary product A moves with the rotation of the drum 1 and is sent to the lower surface of the first end seal 11. The roller 12 of the first end seal 11 is rotating in synchronization with the rotating drum 1, and the pressing plate 13 presses the packaging film f against the drum surface 2 every rotation, thereby heat-sealing the packaging film f. The seal portion is indicated by the symbol SL.

■: Furthermore, as the rotating drum 1 rotates, the sanitary product A is moved to the second position.
It is fed into the lower surface of the end seal 14.

In the above step (2), the packaging film f is heat-sealed, causing thermal contraction, and even if it slightly moves while moving to the second end seal 14, the sanitary product A will not be affected by the negative impact caused by the suction mechanism. It is adsorbed to the drum surface 2 by pressure, and the conveyance position will not shift. Therefore, the seal portion S1 is accurately positioned on the lower surface of the second end seal 14.

Since the roller 15 of the second end seal 14 is also rotating in synchronization with the rotating drum 1, in this process,
Heat sealing can be performed accurately overlapping the seal portion S1. This second sealing portion is indicated by reference numeral S2.

■: After completing the second seal, the sanitary product A is sent to the cutter 17 by the rotating drum 1, where it is sent to the sealing part S.
A cut is made at l, 32.

This feeding to the cutter 17 also does not cause positional deviation, since the sanitary product A is attracted to the drum surface 2 by negative pressure. Therefore, it is possible to cut at an accurate position.

■: Sanitary products A, which have been individually packaged by being cut in the previous process, are placed on the vacuum belt 32.3 described above.
6 etc., it is sent to the next process.

As described above, according to this embodiment, the packaging film f has 2
Since it can be heat-sealed in the same position multiple times, it is possible to obtain a package that has sufficient strength and is resistant to tearing.

The above embodiment can be used as a bag making machine to make synthetic resin bags by folding the synthetic resin film into an envelope shape and supplying the article without covering it instead of the article covered with the synthetic resin film. be able to. Also in this case, it is possible to obtain a bag with a strong seal that is hard to tear.

[Effects of the Invention] According to the present invention, it is possible to provide film packaging for small articles that is difficult to tear and has sufficient strength. Furthermore, a film bag with high strength can be manufactured as well.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a packaging machine according to an embodiment of the present invention;
2 is a partial perspective view of the rotating drum 1, FIG. 3 is a sectional view showing the rotating drum 1 and the suction mechanism, FIG. 4 is a perspective view of the guide block 6, FIG. 5 is a perspective view of the roller 12, and FIG. The figure is a perspective view of the roller 18, FIG. 7 is a perspective view of the vacuum drum 31 and vacuum belt 32, and FIG. 8 is a process diagram of the packaging operation according to the embodiment of FIG. (Main symbols in the drawings) 1: Rotating drum 2 Ni drum surface 3: Suction hole 11 = first end seal 14; second end seal 17: Cutter A: Sanitary product f: Packaging film Sl: First seal part S2: Second seal part

Claims (1)

[Scope of Claims] 1. A packaging machine for packaging a large number of articles one by one in the form of a bag with a synthetic resin film, comprising a transport means for sequentially transporting a large number of articles covered in an envelope shape with a synthetic resin film. a suction mechanism that applies negative pressure to the article moving on the transfer means and brings it into close contact with the transfer means; a first end seal that performs a first heat seal on the transfer means; A packaging machine 2 comprising a second end seal that performs a second heat seal on the sealed portion, and a cutter that cuts the sealed portion; a transport means that sequentially transports the synthetic resin film folded into an envelope shape; a suction mechanism that applies negative pressure to the synthetic resin film moving on the transfer means and brings it into close contact with the transfer means; a first end seal that performs a first heat seal on the transfer means; A bag making machine comprising: a second end seal that performs a second heat seal on the sealed portion; and a cutter that cuts the sealed portion. 3. The apparatus according to claim 1 or 2, wherein the transfer means is a rotating drum, and the suction mechanism is a large number of suction holes formed in the drum surface of the rotary drum and suction means connected thereto.