JPH0442244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a sealing device for a bag making, filling and packaging machine. This effectively eliminates the risk that when sealing or cutting is performed, the sealing surface may shrink excessively due to heat, or the molten web residue may adhere to the sealing body, hindering smooth sealing over time. The present invention relates to a sealing device.

Prior Art First, in order to contribute to the understanding of the present invention, before a detailed explanation thereof, a bag-forming-fill-sealing machine in which the present apparatus is suitably implemented will be briefly described with reference to a typical vertical pillow packaging machine shown in FIG. Describe. In this vertical pillow packaging machine, a packaging material web 16 fed out from a raw fabric roll 14 by feeding rollers 18, 18 is transferred to a former 12 disposed above a vertical article filling pipe 10.
After forming the web 16 into a cylindrical bag 20 with a former 12, the web 16 is intermittently transferred downward along the surface of the pipe 10 by a predetermined length. Then, both ends of the bag body 20 in the longitudinal direction overlapping with each other are vertically sealed by the center sealing device 22, and the article W is dropped and supplied into the bag body 20 from above through the pipe 10, and then the end seal By performing lateral sealing and cutting with the device 24, a vertical pillow package 26 filled with the article W is obtained.

Problems to be Solved by the Invention By the way, in this type of bag making, filling and packaging machine,
When heat sealing is applied to the tubular bag 20 as described above, good sealing and cutting may not be achieved depending on the material of the packaging web 16. In other words, high-pressure polyethylene and other low-pressure polyethylenes have excellent tensile strength and are inexpensive, so
It is widely used as a packaging material in the field of packaging machines, but on the other hand, it has the disadvantage of a high shrinkage deformation rate when heated. For this reason, in the sealing device of the conventional bag-filling-sealing machine, the sealing part of the cylinder body shrinks excessively during heat sealing, which may impair the finished appearance of the pillow-packed product, or cause the sealing surface of the sealing device to There were some inconveniences such as the adhesion of molten polyethylene residue.

Purpose of the Invention The present invention has been proposed in order to solve the above-mentioned difficulties that arise when a synthetic resin material such as polyethylene, which tends to undergo heat shrinkage deformation, is used as a base material for a packaging web. To provide a sealing device in which the sealing surface of a web is always maintained in a good condition during the application, and in addition, molten residue of the web does not adhere to a sealing body.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the intended purpose, the present invention provides a pair of seal bodies that are arranged facing each other so as to be close to and separated from each other across the transfer path of the cylindrical bag body. of,
Two seals are provided along the transfer path of the cylindrical bag body, and the two pairs of seal bodies are operated synchronously to apply each seal to the cylindrical bag body across the intended cutting site. In the sealing device of the filling and packaging machine, a heat-resistant belt is positioned in front of each sealing surface of the two pairs of seal bodies, and a heat-resistant belt is positioned on the upstream and downstream sides of the two pairs of seal bodies in the transfer path of the cylindrical bag body. The heat-resistant belts are arranged facing each other so as to be close to each other and can be separated from each other, and the heat-resistant belts are supported on their respective opposing surfaces so as to be able to slide freely, and prior to the sealing operation of the two pairs of seal bodies, the belts are placed in the vicinity of the portion of the cylindrical bag body to be sealed. two pairs of first clamp members that synchronously clamp the cylindrical bag through a heat-resistant belt;
a second clamp member that operates together with the two pairs of first clamp members to synchronously clamp the vicinity of the portion of the cylindrical bag to be cut;
The clamp member is in branch communication with air passages bored in the two pairs of first clamp members, and cooling air is supplied through the heat-resistant belt toward the sealed portion of the bag body provided by each of the seal bodies. It is characterized by comprising an air blowing hole for blowing air.

Embodiments Next, a sealing device for a bag-forming-fill-sealing machine according to the present invention will be described below with reference to preferred embodiments and the accompanying drawings. In addition, as an example,
Although the horizontal sealing device of the vertical pillow packaging machine shown in FIG. It can be widely used.

FIG. 2 is a plan view of a sealing device according to one embodiment, showing a half portion of the horizontal sealing device with the filling pipe 30 as the center, and FIG. 3 is a longitudinal cross-sectional view of the horizontal sealing device shown in FIG. , Figure 4 is similar to Figures 2 and 3.
FIGS. 5A to 5F are exploded perspective views showing the schematic structure of the apparatus according to the embodiment shown in the figure, and are explanatory diagrams chronologically showing the operating sequence when the apparatus according to the embodiment is actually operated.

(About the outline of the horizontal sealing device) Both ends of a guide rod 34, which is a round bar with a predetermined length, are inserted through a pair of frame plates 32, 32 that are horizontally opposed to each other with a predetermined distance apart as shown in the figure. 36 is tightened and fixed. Attach a slide metal 3 to each guide lock 34 (the other guide rod is not shown).
8, 40 are slidably inserted and supported, and the corresponding slide metals 38, 38 and 40, 4
0, substrates 42 and 44 having a U-shaped cross section as shown in FIGS. 3 and 4 are arranged and fixed at both ends thereof. In addition, the slide metals 38, 40
As shown in FIG. 2, there are movable joints 47,
49, one end of the connecting rods 51, 53 is connected, and the other end of these connecting rods 51, 53 is connected to an actuator such as a pneumatic cylinder (not shown), whereby both slide metals 38, 4
0 along the guide rod 34 to give a linear motion of relatively approaching and separating from each other.

The substrates 42 and 44 are provided with various members such as seals and Teflon belts, respectively, as will be described later, but as shown in FIG.
The configuration of the substrate 44 is slightly more complicated than that of the other substrate 44 because a web cutting knife and its driving mechanism are further provided therein. Therefore, FIG. 4 shows the board 42 and its accompanying members having this complicated structure. Therefore, both boards 4
Regarding various parts commonly arranged in 2 and 44,
The explanation will be given by taking the substrate 42 as an example (that is, unless otherwise specified, the same members indicated by the same reference numerals are also provided on the other substrate 44).

As can be seen from FIG. 4, the substrate 42 is a plate member having a U-shaped cross section that is vertically erected, and a rectangular opening 46 having a required length is bored in the vertical surface of the substrate 42. A seal body 48, which will be described later, faces the opening 46 so as to be movable in a non-contact manner. That is, the back side of the substrate 42 (the other substrate 44
(in the opposite direction to the installation side), there are two support rods 50 each on the upper and lower sides.
A rectangular plate 52 is bolted through the rectangular plate 52, and a relatively short stroke pneumatic cylinder 54 is disposed on this rectangular plate 52. The piston rod 56 of the cylinder 54 protrudes toward the substrate 42 through a through hole 58 formed in the center of the rectangular plate 52, and is connected and fixed to the mounting plate 60 of the seal body 48. For example, a male thread is threaded on the tip of the piston rod 56, and a female threaded hole 62 is bored in the center of the mounting plate 60, and the connection is made by screwing the holes. The seal body 48 is attached to the front surface of the mounting plate 60 by, for example, bolts or the like.

The seal body 48 is configured as a pair of parallel seal members disposed vertically and spaced apart by a predetermined distance as shown in the figure, and as shown in FIG. 64 were buried. Further, the seal body 48 attached to the substrate 42 is not provided with an electric heater, and functions merely as a seal receiving surface. However, a structure may be adopted in which the electric heaters 64, 64 are embedded in both the seal bodies 48, 48.

In order to prevent the seal body 48 (and the mounting plate 60) connected to the piston rod 56 of the cylinder 54 from rotating, as shown in FIG.
Two recessed surfaces 68, 68 recessed at a required interval on the lower surface of the member 66 are slidably placed on the lower two support rods 50, 50 of the four support rods 50. Recommended. Note that in the assembled state, the mounting plate 60 is attached to the board 4 as shown in FIG.
2, that is, between the substrate 42 and the rectangular plate 52, the seal body 48 faces into the opening 46 of the substrate 42 so as to be movable horizontally.

(Regarding the first clamp members) Next, on the front side of the substrate 42, two pairs of first clamp members are placed on the front side of the substrate 42, which synchronously clamp the vicinity of the sealing portion of the cylindrical bag body 100 in a vertical relationship with the opening portion of the opening 46 sandwiched therebetween. Clamp members 70, 70 and 72, 72 are bolted in parallel. These first clamp members also have the function of freely supporting a heat-resistant belt, which will be described later, and have their longitudinal dimensions set larger than the longitudinal width of the opening 46. A round member 76 made of synthetic resin is partially embedded in the longitudinal direction for smooth sliding movement.

Also, the first clamp members 70, 70, 72, 72
An air passage 78 connected to an air supply source (not shown) is bored in the longitudinal direction of the passage 78.
An air blowing hole 80 is opened in the front inclined end face of the clamp members 70, 70, 72, 72. Compressed air is blown out from the blow-off hole 80, as will be described later, to cool the heated sealing surface of the cylindrical bag 100 through the heat-resistant belt.

(Regarding the second clamp member) Furthermore, a second clamp member 82 is provided on the front side of the board 42 and at a position crossing the center of the opening 46.
is fixed with bolts 74. This second clamp member 82 clamps the web formed into the cylindrical bag 100 and holds it in a fixed position in cooperation with a corresponding second clamp member 82 similarly fixed to the other opposing substrate 44. However, in this embodiment of the horizontal sealing device, a space is further provided for storing a knife for cutting the web.

That is, a knife 86 for cutting the web is housed in a groove 84 horizontally bored in the front end surface of the second clamp member 82 so as to be movable horizontally. The other board 4
The second clamp member 82 is installed oppositely on the 4th side.
The groove portion 84 is accessible from the front. The knife 86 has a second
The clamp member 82 is set to have a longer dimension than the clamp member 82, and is fixed to piston rods 90, 90 of pneumatic cylinders 88, 88 attached at a predetermined interval to the back surface of the substrate 42, and is driven forward and backward by the cylinders 88, 88. Further, a knife 8 is provided at the innermost part of the groove 84 of the second clamp member 82 attached to the other board 44.
A round rod-shaped buffer member 92 is provided that forms a receiving surface when the blade portion of No. 6 enters.

(Regarding the Belt Winding Mechanism) As is clear from FIG. They horizontally protrude a predetermined distance from the vertical front surfaces of the substrates 42 and 44, and their respective surface positions substantially coincide with each other in the vertical direction. A belt winding mechanism consisting of rolls 94, 94 is disposed correspondingly on the upper and lower end surfaces of the substrates 42, 44 in the longitudinal direction, and a belt 96 made of synthetic resin with excellent heat resistance (for example, the trademark " (Belt made from heat-resistant resin known as "Teflon")
is wound between each roll 94, 94.

This belt 96 is constructed as a sufficiently wide film, and its winding sequence is as follows. In other words, as clearly shown in Figure 3,
On the side with the knife 86 , a belt 96 extending from the upper roll 94 passes through the round piece 76 of the upper first clamping member 70 and passes through the second clamping member 82 .
After entering into the horizontal groove 84 of the web cutting knife 86 and bypassing the back side of the web cutting knife 86, the web takes a route that passes through the round material 76 of the lower first clamp member 72 and reaches the roll 94 below.

Further, on the side not having the knife 86, the belt 96 extending from the upper roll 94 passes through the round member 76 of the upper first clamp member 70, enters into the horizontal groove 84 of the second clamp member 82, and is located here. After bypassing the round rod-shaped buffer member 92, a route is taken to reach the lower roll 94 via the round member 76 of the lower first clamp member 72. If either of the belts 96, 96 has deteriorated due to use, each roll 96 can be rotated in a timely manner to take up and move the belt, so that the belt can be used on the surface that has not deteriorated. easily done. Furthermore, the third
In the figure, reference numeral 98 indicates a heat insulating cover member for blocking the heat influence from the seal body 48 which becomes high temperature.

Effects of the Embodiment Next, the effects of the sealing device of the bag making, filling and packaging machine according to the embodiment configured as described above will be explained. The pair of left and right second clamp members 82, 82 and the seal bodies 48, 48 supported by the substrates 42, 44 are
As shown in FIG. 5a, under the filling pipe 30, the bags 100, which are formed into a cylindrical shape, are always retracted and separated from each other to be opened. At this time, the knife 86 is retracted into the groove 84 of one of the second clamp members 82.

When the time comes to apply a horizontal seal to the bag body 100 in response to an appropriate control command, the slide metals 38 and 40 shown in FIG. 2 move toward each other on the guide rod 34, as shown in FIG. 5b. , second clamp members 82, 82 and a pair of upper and lower first
The clamp members 70, 70 and 72, 72 are moved close to each other to clamp the bag 100 via the left and right heat-resistant belts 96, 96, and hold the bag 100 in a fixed position.

The cylinders 54, 54 are then pneumatically energized;
As shown in FIG. 5c, the sealing bodies 48, 48 move close to each other, pinching the bag 100 through the belts 96, 96, and heat-sealing the area. Further, immediately after the heat sealing is completed, the knife drive cylinders 88, 88 are energized, and the knife 86, which had been retracted into the groove 84 of the second clamp member 82, is horizontally advanced to cut the bag body 100 ( Figure 5d). However, as mentioned above, since the knife 86 is located in front of the heat-resistant belt 96, the belt 96
Never cut.

In addition, at the timing of cutting the bag body 100, air is blown out under pressure from each of the blowing holes 80 formed in the upper and lower first clamp members 70, 70 and 72, 72, and the air is blown out through the belt 96 and the bag body 100 is cut. The heat-sealed portion of the body 100 is cooled.
As shown in FIG.
The process continues even when 48 begins to separate again. In addition, the left and right first clamp members 70, 70, 72,
The clamping state by 72 and the second clamp members 82, 82 also continues. Then, as shown in FIG. 5f, all the members return to their original positions, thereby completing the series of sealing and cutting of the bag.

According to the seal device according to the embodiment, the seal body 4
8, 48, the first clamp members 70, 70, 72, 72 and the second clamp members 82, 82 operate to seal the vicinity of the seal/cut portion of the bag 100. Make sure to apply pressure. Then, the cylindrical bag body 100 is attached to the heat-resistant belt 9
6 and 96, and this heat-sealed portion is cooled by air blowing, so that the sealed portion of the bag body 100 does not shrink excessively due to heat, and the molten scum is not removed from the seal of the seal body 48. It does not stick to surfaces.

Effects of the Invention As explained above, according to the sealing device according to the present invention, before the sealing body heat-seals the cylindrical bag body, the first clamp member and the second clamp member are placed near the sealing/cutting portion of the bag body. The bag is compressed and heat-sealed via a heat-resistant belt, and after the heat-sealing, cooling is performed by blowing air. That is, since the heat sealing on the cylindrical bag is performed indirectly via the heat-resistant belt, the sealing body is completely isolated from the bag. Therefore, no molten residue adheres to the sealing surface of the sealing body, and smooth sealing is always achieved. Even with webs that have high heat-shrinkability, such as polyethylene film, a good finish can be achieved. Can be heat sealed.

Furthermore, since the heat-resistant belt is wound into a roll and can be rolled and moved as necessary,
Even if molten scum may adhere to the belt during heat sealing, a clean belt surface is always exposed by winding the belt. Therefore, this also has the beneficial effect of achieving a clean heat seal.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a vertical pillow packaging machine, and FIG. 2 is a plan view of a sealing device according to an embodiment of the present invention, showing half of the horizontal sealing device centered on the filling pipe. Figure 3 shows the body part, and Figure 3 shows the body part.
FIG. 4 is an exploded perspective view showing the schematic structure of the embodiment device shown in FIGS. 2 and 3, and FIGS. FIG. 3 is an explanatory diagram chronologically showing the operating order when the system is actually operated. 48... Seal body, 70, 72... First clamp member, 78... Air passage, 80... Air outlet, 82... Second clamp member, 86... Knife, 94... Roll, 96... Heat resistant belt, 1
00...Tubular bag body.

Claims (1)

[Claims] 1. A pair of seal bodies 4 facing each other so as to be able to approach and separate from each other across the transfer path of the cylindrical bag body 100.
8, 48 are provided along the transfer path of the cylindrical bag 100, and these two pairs of seal bodies 48, 48,
In the sealing device of the bag-forming-fill-sealing machine, the two pairs of seal bodies 48, 48 are configured to perform respective seals on the cylindrical bag body 100 across the intended cutting portion by synchronously operating the two seal bodies 48, 48. , 48, a heat-resistant belt 96 positioned in front of each sealing surface of 48,
96, and the above-mentioned 2 in the transfer path of the cylindrical bag 100.
The pair of seal bodies 48, 48, 48, 48 are disposed facing each other so as to be close to and separated from each other on the upstream and downstream sides, respectively, and the heat-resistant belts 96, 96
In addition, prior to the sealing operation of the two pairs of sealing bodies 48, 48, 48, 48, the vicinity of the sealing area of the cylindrical bag 100 is synchronously supported through the heat-resistant belts 96, 96. The two pairs of first clamp members 70, 70, 72, 72 which are clamped by the two pairs of seal members 48, 48, 48, 48 are close to and separated from each other at a position sandwiching the transfer path of the cylindrical bag 100. second clamp members 82, 82 which are arranged to be able to face each other and which operate together with the two pairs of first clamp members 70, 70, 72, 72 to synchronously clamp the vicinity of the portion to be cut of the cylindrical bag body 100; , the two pairs of first clamp members 70, 70, 7
branch communication with an air passage 78 bored in 2, 72;
The heat-resistant belt 9 is directed toward the sealed portion of the bag body 100 provided by the seal bodies 48
6. A sealing device for a bag making, filling and packaging machine characterized by comprising an air blowing hole 80 for blowing cooling air over the air. 2. The bag-making bag according to claim 1, wherein the heat-resistant belts 96, 96 are wound around respective rolls 94, 94 at both ends thereof, and configured so that the belts 96, 96 can be wound and moved as necessary. Sealing device for filling and packaging machines. 3 The second clamp members 82, 82 are provided with a knife 86 on one side thereof so as to be able to move forward and backward, and this knife 86
2. A sealing device for a bag-forming-fill-sealing machine according to claim 1, wherein 6 operates after the sealing operation of each of the sealing bodies 48, 48 to cut a portion of the cylindrical bag body 100 to be cut.