JPS6133915A - Sealing method of vacuum packaging - 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 relates to a sealing method used in a rotary vacuum packaging device. More specifically, a bag containing an object to be packaged is supported with a clamp in a vacuum chamber, and after a vacuum is applied to the object to be packaged in the chamber, the opening of the bag is compressed with a sealing par. The present invention relates to a method for melt-sealing.

(Prior art) When vacuum packaging items that tend to spill from the mouth of the bag, such as foods containing seasoning liquid such as delicatessen dishes, the general method is to hang the bag in a vacuum chamber using a clamp. is taken. As a conventional vacuum packaging device that rotates a large number of vacuum chambers along an endless track and applies vacuum to bags that are each supported by clamps in each chamber, -, 22626 and Utility Model Application Publication No. 56-'24606. Each of these known devices is equipped with a sealing bar inside each vacuum chamber, and the air inside the vacuum chamber is sucked in by a vacuum pump, and the mouth of the bag is compressed with a sealing bar while keeping the inside of the vacuum chamber in a vacuum. After that, the atmosphere is introduced into the vacuum chamber. Generally speaking, it is thought that the opening of the bag is instantaneously sealed by the impulse voltage, but the sealing bar remains closed until the sealing part of the bag is cooled and solidified by the cooling water flowing inside the sealing part. Sealing the bag takes a considerable amount of time since it is not possible to release the bag from the bag. The endless orbit that transports the vacuum chamber is a perfect circular orbit (・3
6'O degree), of which 180 degrees or more is required for operations such as supplying the bag to the clamp, opening the mouth of the bag, filling the bag with the packaged material from the opening, and sealing liquid in some cases. In addition, about 60 degrees is used as a sealing area at the mouth of the bag, so the area where the vacuum actually acts on the packaged items ranges from about 10 degrees to about 120 degrees.

If the area (angle) at which the vacuum is applied to the packaged items can be expanded, efficiency can be improved to some extent by increasing the conveyance speed of the vacuum chamber, but there is a limit to the area allocated to each task on the endless track. Since it is designed to have a large capacity, no improvement in efficiency can be expected unless the track area is increased.

(Problems to be Solved by the Invention, etc.) In view of the above points, the present invention further expands the area where vacuum is applied to one packaged item without increasing the orbital area, that is, without increasing the size of the device. The purpose is to improve efficiency.

(Means for Solving the Problems) The present invention eliminates the seal area from the endless track for transporting the vacuum chamber, thereby making it possible to expand the area in which the vacuum is applied to the packaged items. That is, the present invention intermittently transports a large number of vacuum chambers arranged at equal intervals along the endless track at intervals equal to the arrangement interval of each vacuum chamber along the endless track, and Exclude the air in the vacuum chamber in the area of
In the method of applying a vacuum to the packaged item in an open bag supported by a clamp in the vacuum chamber, introducing the atmosphere into the vacuum chamber, and further dividing the vacuum chamber, The opening of the bag in the divided vacuum chamber is clamped by a sealing bar that is displaced within a predetermined range and its receiving member and taken out to the outside of the vacuum chamber, and the rear vacuum chamber is transported to this chamber divided area. After applying heat to the bag with the sealing bar, the bag is continued to be held by the sealing bar and the receiving material.

According to the present invention, a bag that is not completely sealed is taken out of the orbit of the vacuum chamber by the sealing device, and the sealing action is performed at the position where it is taken out, so that the sealed area can be excluded from the said orbit, and the sealed area is increased accordingly. The area over which the vacuum is applied to the package can be expanded.

(Example) Embodiments of the present invention will be described below based on the drawings.

In Figure 1, there are 8 arms +21 (21・
... project radially, and a vacuum chamber +31 +3) - is fixed at the end of each arm. Second
As shown in the figure, the vacuum chamber (3) has an arm (2
) is fixed on the board 0ω and the board (parallel link α1 to 1α) (
12) and a movable lid (13) connected via a lid (12). The arm (2) has a hollow interior, and the interior of the arm communicates with a vacuum pump (not shown) via a rotary valve (5) provided at the top of the rotor (1).

Further, a block (151) is fixed to the upper front surface of the board aα, and the fixed block (movable block α6 provided at a position opposite to 151) is pivotally supported to the pin α frame via a rod αη,
Clamp supporting bag ■ by two blocks (4)
is formed. Further, a bell crank (2I) supported through a pin (2G) in a chamber formed by expanding a part of the disk (1α) in the rear direction is connected to the rod αD via a link (two hot springs).

Therefore, in Fig. 1, the rotor (1) is connected to the rotor (1) via the arm (2).
Eight vacuum chambers f31 +31...
- The rotor (1) is intermittently rotated clockwise on an endless circular orbit by the power applied to the rotor (1).

The pitch of the intermittent movement along this endless trajectory is the same as the mounting interval of each vacuum chamber +31 +31..., so each vacuum chamber +3+ +31... is moved one by one. As shown in Fig. 2, the end of the lever (C) fixed to the shaft 1241 of the link αυ is in contact with the endless rail (27) via the roller (E), and the surface of the rail (5) is At the lower position H, the lever Q51 is pressed down by the same rail (5), so the lid (13
1 approaches the board 0@, and on the other hand, at the position where the surface of the rail η is up, the lid a is separated from the board 0 by its own weight. On the other hand, the lever (2) fixed to the end of the shaft (24) of the bell crank ■υ
The upper surface of another rail (23) is marked by a spring (
= Being forced. The tensile force of the spring generates a force that pulls the movable block (1e) away from the fixed block α■ and constantly tries to open the clamp (4). ), the clamp (4) is opened at the position where the upper surface of the bag (4) is lowered.Therefore, at position A in FIG. A suction port is opened on the opposite surface, and the bag has an auxiliary function of suctioning the bag.Next, at the B position and the C position, the bag is opened with a clamp and the packaged items are filled into the bag. Next, the vacuum chamber (3) is continuously closed from the D position to the E position, and the inside of the vacuum chamber (3) is communicated with the vacuum source through the passage inside the arm (2).

In this case, the clamp (
4) is holding the bag to prevent it from falling off. however,
There is a gap in the clamp (4), and a vacuum is applied to the packaged item inside the bag through this gap. Next, at the F position, atmospheric air is introduced into the vacuum chamber (3) from the rotary valve (5), and the bag is pressed flat by the pressure difference.

The mouth of the bag is not sealed, but is still closed by pressure.

Therefore, even if the vacuum chamber (3) is divided, air will not flow into the bag unless an impact is applied to the bag. In some cases, the bag may be temporarily resealed in the vacuum chamber immediately before introducing the atmosphere into the vacuum chamber. Next, in the G position, the mouth of the bag is sealed with a sealing device (6
) and removed from the vacuum chamber (3).

Details of the sealing device are shown in FIGS. 3 and 4. That is, the device connects the sealing par Oυ and its receiving material Oυ to the head frame (to) with pins (to) (33).
The movable iron core C35) of the solenoid (B) fixed to the upper part of the head frame, the movable frame (34) of the sealing par (31) and the receiving member (32)
(34) via links (36) and (36), and as shown in FIG. (to) is supported by a bearing (4) fixed to the end of the machine, and a lever (421) fixed between the shafts is connected to the power section via a link (43). As shown in the figure, the sealing par Gυ is equipped with a nichrome wire (44) for heating the bag and a hose for circulating cold water.

Therefore, in Fig. 3, the movable iron core is 0! by the solenoid (34). When i) is pushed downward, the bag ■ is pressed between the sealing par (31) and the receiving material trowel, and on the other hand, when the movable iron core 05) is pulled up, the bag ■ is pressed against the sealing par (31). 31) be freed from. On the other hand, as shown in Figure 2,
Air is introduced into the vacuum chamber, and the lid (I3) closes to the board (1).
o) Once separated, the lever (4 levers
is rotated, the head frame (to) reaches the upper area of the bag,
The opening of the bag ■ is held between the sealing par Gυ and the receiving material C32.

Immediately thereafter, the clamp (4) is opened by pushing up the rail (c) by the air cylinder, and at the same time, the bag is taken out of the vacuum chamber by the rotation of the shaft (2). Nichrome wire (44) installed on sealing par c3υ
An impulse voltage is applied to the opening of the bag (2), which instantaneously melts the mouth of the bag (2), and then the heat of the sealing part 0υ is removed by the cooling water flowing through the hose (3) and the melted part of the bag is solidified. The bag is held by a sealing par 0) and a receiver (32) and is released just before the rear vacuum chamber reaches the dividing area.

Then, the sealing device approaches the rear vacuum chamber again and takes the bag out of the vacuum chamber.

In addition, if a sealing device (6) is provided at the G position and the H position, and the two bags are taken out from the two vacuum chambers at the same time using the i6+,
Sufficient time can be obtained until the next bag comes around, and sufficient time can be taken to cool down the sealed portion.

(Effects) In the present invention, the unfinished bag is taken out of the vacuum chamber by the sealing device (6) like a ridge and the sealing action is performed. The area on which the vacuum is applied can be expanded. Therefore, it becomes possible to increase the transport speed of the vacuum chamber and improve efficiency.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a partial vertical sectional view of the previous figure, Fig. 5 is a partially enlarged view of the previous figure, and Fig. 4 is a front view of the previous figure. be. (1)...Rotor, (3)...Vacuum chamber, (
4)...Franz, (5)...Rotary valve,
(61... Sealing device. αO... Board, (13)... Lid, ol)... Sealing bar Oa... Receiving material, (34)... Solenoid, ■... Bag. Figure 1 Figure 8 Figure 4

Claims (1)

[Claims] A large number of vacuum chambers arranged at equal intervals along the endless track are intermittently transported along the endless track at intervals equal to the arrangement interval of each vacuum chamber, and the vacuum chambers are transported at predetermined areas on the endless track. After removing the air and applying a vacuum to the packaged items in an open bag supported by clamps in the vacuum chamber, air is introduced into the vacuum chamber, and the vacuum chamber is further divided. In the method described above, the mouth of the bag in the divided vacuum chamber is clamped by a sealing bar that is displaced within a predetermined range and its receiving member, and taken out to the outside of the vacuum chamber, and the bag is placed in the divided area of the chamber. The vacuum packaging is characterized in that, after applying heat to the bag with the sealing bar, the bag is continued to be held by the sealing bar and the receiving material until the vacuum chamber is transported. Seal method.