JPH0771964B2 - Liquid exclusion sealing method and sealing mechanism for filling and packaging - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for sealing while eliminating liquid in a sealing portion in a packaging machine for filling contents containing liquid, and a mechanism therefor.

(Prior Art) A mechanical device that seals while continuously filling a tubular body that is continuously supplied with food and other contents is known. In this type of device, usually one heat welding means and one separating means are provided, and both means are provided at the same location (Jitsuko Sho 58-40009) or apart from each other.

(Technical Problem) By the way, in the case of filling and packaging the contents containing a liquid by the above-mentioned device, there is a problem that the liquid remains inside due to the capillary phenomenon in the usual method even if the tubular body is sandwiched from both sides. When the heat-sealing with a plurality of lines is performed on the portion where the liquid remains, the liquid remains between the sealed lines, and there is a defect that the liquid oozes out at the time of separation.

This leakage not only stains the packaged product and the cutter, but also causes a problem that the sharpness of the cutter is deteriorated at an early stage.

If a strip-shaped so-called solid seal is used instead of the line seal,
Since there is no escape area for liquid, it becomes foamed by heating, significantly impairing aesthetics and at the same time reducing the strength of the seal.
In addition, due to poor heat dissipation, a threading phenomenon occurs in which resin adheres to the blade during cutting work, resulting in a reduction in work efficiency and quality.

On the other hand, when the heat-sealing member was replaced with one having a quadric surface, although it was not as flat as a flat seal, a slight bubbling phenomenon remained and the stringing phenomenon in the cutting operation did not disappear. After all, these problems are caused by the solid seal by high temperature heat seal, and it is considered that the problem always occurs when high temperature seal is performed in a state where the liquid content on the inner surface of the bag remains above a certain amount.

The present invention has been made on the basis of the above findings, and its object is to effectively remove liquid from the seal portion when filling and packaging contents containing liquid, which may cause a foaming phenomenon. Another object of the present invention is to provide a liquid-exclusion sealing method and a sealing mechanism in a filling and packaging machine that can perform high-quality sealing.

(Technical Means) The purpose is to fill the tubular body with a liquid-containing content in the process of supplying a continuous tubular body made of a heat-welding resin in the longitudinal direction and to increase the width of the tubular body. In a filling and packaging in which a seal is made in the direction, a step of flattening a tubular body filled with contents from both sides, and further pressing both sides of the flattened tubular body in the width direction, A liquid elimination step of sticking the resin on both sides by pushing the inside liquid up and down centering on the pressurizing part, and a set temperature for causing regular heat welding to the resin stuck through the step Achieved by going through a temporary sealing step that performs heat welding at a lower temperature than that, and a main sealing step that performs heat welding at the set temperature for the temporary sealing portion at a position below the step by the bag length. To be done.

To carry out the method, a pair of ironing rolls, which are located above the supply path from the top to the bottom in the filling package and are provided so as to be able to come into contact with and separate from the cylindrical body from both sides, and a middle position of the supply path. Positioned, provided in a manner similar to the pair of rolls so as to be capable of coming into contact with and separating from the tubular body from both sides, and a curved surface pressurizing portion protruding with respect to the tubular body,
A heater arranged opposite to the heater for heating the elastic pressure portion elastically deformed by the pressure of the pressure portion and the curved pressure portion at a temperature lower than a set temperature for causing regular heat welding of the resin. And a heater which is located below the supply path by the length of the bag and which is similarly provided so as to be able to come into contact with and separate from the tubular body, and which heats the temporary seal portion at a set temperature. It is desirable to use a sealing mechanism having a structure in which the main sealing means having the above is provided.

In the present invention, the contents to be filled in the tubular body may be those which are purely composed of a liquid, those which are a mixture of liquid and solid, those which are in a fluid state, or those in which the liquid is leached from a solid, The target is the one that is easily affected by the liquid on the seal part.

(Example) Hereinafter, description will be given with reference to the drawings.

An exemplary filling and packaging machine for carrying out the method of the present invention is shown in FIGS.
As shown in the figure, a roll R of a film and a sheet having a heat-welding property is built in the machine body 1, is drawn out to the upper part of the front surface of the machine body, and is almost inverted by the guide plate 2 to serve also as a means for filling the contents. The tubular body R'is wrapped around the tubular guide body 3 and the heat-sealing portion 4 welds the both side ends together.
Has the function of molding. Further, the tubular body R'is sealed at regular intervals while removing the liquid of the content N containing the liquid in the tubular body along the path for supplying the tubular body R'from the front upper part to the lower portion, and the packaged product is obtained. A liquid excluding seal mechanism R "is provided.

Next, the liquid exclusion and sealing method of the present invention to be carried out on such a filling and packaging machine will be described. The process is shown in FIGS. 3 to 6, where I is a flattening process, II is a liquid removing process, III is a temporary sealing process, IV is a main sealing process, and V is a cutting process.

In the flattening step I, when the tubular body R ′ moves downward along its supply path, the tubular body R ′ is sandwiched from both front and rear sides at the normal stop position of the packaging machine shown in FIG. Then add pressure. As a result, the tubular body R ′ is pressed by the atmospheric pressure to keep the flat state in which the liquid content of the content N remains in the form of a thin film and the both surfaces are combined. As the flattening means, a means which can press both sides of the tubular body R'and which can be brought into contact with and separated from the tubular body is used. Especially, when the rotating rolls 5 and 6 are used, scratches are not generated. It is ideal because the feeding action is smooth.

The liquid removing step II is a step of further pressurizing the seal portion of the flattened tubular body R ′ to reduce the liquid remaining inside as much as possible and to bring the resin on both surfaces into close contact (fourth).
Figure). In order to remove the liquid, it is not sufficient to concentrate the pressure with a strong pressing force in the width direction of the cylindrical body R ', and it is necessary to provide an escape area for the liquid. This is the reason why in the present invention, the liquid is pushed up and down around the pressing portion. In order to carry out this pressing method, it is necessary to use at least one member having a cylindrical curved surface. One example is to make an arc contact a flat surface.With this combination, the width of the contact surface changes when the flat surface side is made of an elastic material and the elasticity and pressure are changed. The width of the seal can also be adjusted or set.

In the temporary sealing step III, the pressure-applied portion from which the liquid has been removed is heated at a temperature in the vicinity of the minimum temperature at which the resin forming the tubular body can be welded, and may be a solid seal or a line seal. It is preferable to use a solid seal in this step because of the relationship with the main seal described later. This is because it is easy to obtain the required seal strength even at low temperatures, and even if a very small amount of liquid remains between the resins, it does not foam. The first filling of the tubular body with the liquid-containing contents N is performed after completion of the temporary sealing. It is best to perform the temporary sealing at the same time as the liquid removal described above, and since the seal part from which the liquid has been removed is heated at a low temperature as much as possible, it does not cause any abnormalities in the seal part. can get.

The main sealing step IV is a step in which the temporary sealing portion is heated and welded at a regular temperature (set temperature). The interval between this step and the previous step III is the height of the packaged product R ″, that is, the upper seal from the lower seal. The lengths of the seals are separated.The tubular body R'is moved from the temporary seal to the position of the main seal by the length described above, but both sealing operations can be performed simultaneously at the respective positions (Fig. 4). Thus, the tubular body R'is intermittently transferred downward for each length of the packaged product R ". This seal is preferably a line seal, as opposed to a solid seal of a temporary seal, which increases the seal strength and improves the appearance.

The cutting step V is a step of separating the upper main sealing portion of the packaged product R ″ whose lower and upper portions are main sealed in the width direction to form one product. The cutting is a solid seal when the line seal is the main seal. As a result, a clean cut surface is obtained without the influence of heat, and liquid bleeding does not occur.

The cutting process can also proceed at the same time as the main sealing process (Fig. 4), and the packages are separated one by one to form a packaged product R "(Fig. 5).

At the same time as the cutting step V is completed, the next upper temporary sealing step III can also be completed (FIGS. 4 and 5), and the following contents are filled in the tubular body above the temporary sealing,
Therefore, the load is applied to the temporary seal portion. Therefore, if a measure is taken to partially bear the load (Fig. 5 VI), it is possible to protect the temporary seal part that is difficult to cool and is in an unstable state from the internal pressure that accompanies the flattening, especially when filled with a high-temperature liquid, In addition, it is possible to stabilize the internal capacity.

Mechanism The sealing mechanism used directly for carrying out the above-described liquid exclusion sealing method is specifically shown in FIG.

In FIGS. 1 to 12, 5 and 6 are a pair of ironing rolls which are located above the supply path and are provided on both sides of the tubular body R ′ so as to be in contact with each other and to be separated from each other. In charge of the step I of flattening the body R'from the front and back.

Reference numerals 7 and 8 denote a pair of bag restricting plates arranged between the flattening step I and the temporary sealing step II, which will be described later, for performing the measure VI.
When the contents are filled in the tubular body, the tubular body R'is provided so as to approach and come from both front and rear surfaces so as to partially bear the load, and a supporting surface inclined outward from the upper portion is provided. Have. Reference numeral 9 denotes a liquid level monitoring capacitance sensor.

10 is a temporary sealing means, which is located in the middle of the supply path,
Curved surface pressing portion having a cylindrical curved surface protruding with respect to the cylindrical body R '
11 and an elastic pressurizing portion 12 arranged to face the elastic pressurizing portion 11, and a heater for sealing the surface of the curved surface pressurizing portion 11 at a temperature near the minimum temperature at which tubular resin can be welded. Equipped with 13. The curved pressurizing portion 11 has a maximum width equal to that of the main seal to allow temporary sealing, and has a length not less than the entire width of the tubular body R ', and the elastic pressurizing portion 12 is slightly wider than that. Is formed of an elastic material such as silicon rubber so that the curved surface pressing portion 11 is elastically deformed by the applied pressure.
The form of both pressurizing portions 11 and 12 is shown in FIG. 9, but in addition to the combination of the flat surface and the convex surface, the convex surfaces may be butted as shown in FIG. The pressure on ′ becomes stronger. It should be noted that the elastic pressurizing portion 12 during pressurization is recessed following the curved surface shape of the curved surface pressing portion 11. Reference numeral 14 is a seal base to which the curved surface pressurizing portion 11 is attached, and 15 is a seal base to which the elastic pressurizing portion 12 is attached. The adjusting spring 16 changes the seal pressure. 17,
Reference numeral 18 is a support rod for both pressurizing portions, which is operated by a cylinder mechanism for contacting and separating from the tubular body R ″. 19 is a temporary seal portion cover.

Reference numeral 20 denotes a main sealing means, which is located in the lower part of the supply path and is attached to the elevating frame 21 for changing the position according to the length of the bag as a product, and the tubular resin is kept at a predetermined set temperature. Wire seal part that is heated to make a permanent seal in a linear shape
22 and a heater 23 are provided on a seal base 24, and a receiving seal base 26 having an elastic receiving portion 25 at a position facing the supply path is provided, and the receiving portion 25 has a slit at its center. A cutting means 27 composed of a saw-toothed blade or the like is provided so as to project and retract toward the mating slit 27 '. The lifting frame 21 includes front and rear bases 21a and 21b and left and right support rods 21c and 2
It consists of 1d. 28 is an adjusting spring acting on the receiving seal base 26,
Numerals 29 ₁ and 29 ₂ are cylinder mechanisms for actuating the seals, which are provided on the front surface of the frame and the machine side, respectively. Reference numeral 30 denotes a blower for injecting cooling air to the main seal portion, and 31 denotes a cooling air reflecting plate.

Further, 32 is a screw cylinder for being fixed to one side of the elevating frame 21, has nuts 33 on the top and bottom, and is screwed with a male screw rod 34 attached to the side portion on the front of the machine body, and by rotation of the rod 34. Move up and down with the frame. Reference numeral 35 is a gear set for driving a male screw rod, and 36 is a drive shaft, which is operated by attaching a handle 37. 38 is male screw rod 34
The engaging groove, 39 provided at the upper end of the
A stopper shaft 40 for fixing the needle, 40 is a pointer provided on the female screw cylinder 32, and 41 is a pointer for the indication, which is provided on the machine body side. 42 is a guide member that supports the other side 43 of the frame 21, and 44 is a cover that surrounds the entire lifting frame 21 portion, and an opening 45 is provided in the supply path portion.
Have. In FIG. 12, reference numerals 46 and 47 denote support plates for the receiving seal base 26 and the cutting means 27, and the support rod 21 is supported by the cylinder shaft 48 _1.
c, and back and forth along the 21d, the heater-side support plate 49 is actuated by the cylinder axis 48 _2. Reference numeral 50 denotes a control panel provided on the side surface of the machine body.

(Operation) The operation based on the above configuration will be described together with the description of the work procedure for filling and packaging. The tubular body R'formed by drawing from the film roll R starts from the state of FIG. 3 in which the ironing rolls 5 and 6 are closed and stopped.

The tip of the tubular body has reached at least the temporary seal portion 10 in advance, on the other hand, the curved surface pressure portion 11 and the elastic pressure portion 12 are closed,
Pressure is applied to both sides to bring the resin on both sides into close contact. At this time, if the contents N are contained, the liquid is pushed up and down from the center of the pressing portion in accordance with the pressing force of the curved surface pressing portion 11 and the elastic pressing portion 12, and the resin on both sides and the resin have a constant seal. At the width of the heater, it adheres with almost no liquid, and at the same time, the heater 13
Heats up and heats the entire surface of this contact portion at a temperature lower than the set temperature (Fig. 4). At almost the same timing as this, the bag restricting plates 7 and 8 approach both sides of the tubular body R ', the ironing rolls 5 and 6 open, and the contents containing the liquid start to flow in, and then both sealing means 10, 20 open back and forth (5th
Figure).

The liquid that has flowed in is supported by the bag restricting plates 7 and 8 on both sides of the tubular body, and the amount of contents to be filled is adjusted by adjusting the supporting position and the height positions of the ironing rolls 5 and 6. This adjustment may be performed once for the same product. As described above, when the regulating plates 7 and 8 are in an unstable state immediately after the temporary sealing, they protect the temporary sealing portion (bottom) from the internal pressure and hot contents generated by the closing operation of the ironing roll.

Next, the ironing rolls 5 and 6 are closed to start feeding the tubular body R ', and at the same time, the bag regulating plates 7 and 8 are opened (Fig. 6), and the tubular body R'is stopped at the position fed by the length of the bag. Yes (Third
Figure). At this time, the portion that has been temporarily sealed moves to the main sealing step IV, and the temporary sealing step III has a new unsealed portion of the tubular body R ′. The temporarily sealed portion is sandwiched between the front and rear by the wire seal portion 22 and the elastic receiving portion 25 of the main sealing means 20, and the main seal heater 23 generates heat in a linear fashion by heat generation. A temporary seal is performed at the same time as this main seal, which is the same as that described at the beginning, and the above steps are repeated.

The operation method of the filling and packaging machine can be an automatic operation and a continuous operation. In the automatic operation, the liquid waiting operation is stopped until the upper surface of the content N reaches the height of the sensor 9 and waits. When the supply of N is sufficient, continuous packaging will be performed while controlling the inner volume according to the packaging capacity.

(Effect) Since the present invention is configured and operates as described above, it is possible to effectively remove the liquid from the seal portion when the tubular body is filled with and packed with the content containing the liquid. ,
Since the temporary sealing at a temperature lower than the set temperature is performed on the portion where the liquid is sufficiently removed, even if the temporary sealing portion is provided with the solid seal, the foaming phenomenon does not occur at all.

The main sealing is performed on the temporarily sealed portion in this manner. At this stage, heat welding at the set temperature can be performed without any anxiety, and the strength of the seal becomes perfect. Such a two-stage seal allows, for example, a temporary seal to be a solid seal and a main seal to be a line seal, so that the aesthetic appearance of the seal portion is improved, but depending on conditions, slight foaming may occur in the high temperature seal. It doesn't have to be. However, according to the present invention, since the temporary sealing portion between the sealing lines can be cut, even if something happens, the cut surface is clean and there is no fear of liquid bleeding.

Therefore, according to the present invention, the filling and packaging of the contents including the liquid can be performed cleanly and hygienically, the effect of keeping the cutting means good and the sharpness can be obtained, and the maintenance of the seal base etc. is performed frequently as in the conventional case. Cleanliness is maintained for a long time without having to do it. Of course, it is not necessary to wash the product after it is filled and packaged, and the labor for work is remarkably reduced.

[Brief description of drawings]

The drawings show the embodiments of the present invention. FIG. 1 is a front view of a filling and packaging machine, FIG. 2 is a side view, and FIGS. 3 to 6 are side views for explaining steps of a sealing method. FIG. 8 is a front view of the sealing mechanism, FIG. 8 is a partially cutaway side view of the sealing mechanism, and FIG.
FIG. 10 is a side view of the temporary sealing means 2 as an example, FIG. 11 is a cutaway side view of the sealing mechanism, and FIG. 12 is a horizontal sectional view. I ... flattening process, II ... liquid removal process, III ... temporary sealing process, IV ... permanent sealing process, V ... cutting process,
5,6 …… Ironing roll, 7,8 …… Bag restriction plate, 10 ……
Temporary sealing means, 11 ... Curved surface pressure part, 12 ... Elastic pressure part,
20 …… this sealing means, 21 …… elevating frame, 22 …… this sealing section, 23 …… heater, 25 …… elastic receiving section, 27 …… cutting means.

Claims (8)

[Claims] 1. A process of supplying a continuous tubular body made of a heat-welding resin in a longitudinal direction, filling a tubular body with a content containing a liquid and sealing the tubular body in a width direction. In the filling and packaging in which the contents are filled, the step of sandwiching and flattening the tubular body filled with the contents, and further pressing both sides of the flattened tubular body in the width direction, Centered around the liquid, a liquid excluding process in which the resin on both sides is adhered by pushing the liquid inside and below, and a temperature lower than the set temperature for causing regular heat welding to the resin adhered through the process. And a temporary sealing step of performing heat welding at the above step, and a main sealing step of performing heat welding at the set temperature to the temporary sealing portion at a position below the step by a bag length. Liquid exclusion sealing method in. 2. The liquid removal according to claim 1, wherein the liquid removal step and the temporary sealing step are carried out at the same position and at substantially the same time by a common means. Sealing method. 3. The step of cutting the filled and packaged tubular body in the width direction at the main sealing portion to make a packaged product one by one is performed simultaneously at the same position as the main sealing step. 2. The liquid exclusion and sealing method for filling and packaging according to claim 1, which has a structure to be performed in step 1. 4. The liquid-excluding seal according to claim 1, wherein the width of the resin on both sides in which the resin is adhered in the liquid-excluding step is controlled by adjusting the pressure applied to both surfaces of the tubular body. Method. 5. A filling package in which a continuous tubular body made of a heat-welding resin is supplied in the longitudinal direction and filled with a liquid-containing content, and sealed vertically in the width direction. In the upper part of the supply path from the top to the bottom, a pair of ironing rolls provided to the tubular body so as to be able to contact and separate from both sides, and located in the middle of the supply path, like the pair of rolls. A curved surface pressing portion that is provided so as to be able to come into contact with and separate from the cylindrical body from both sides and that protrudes with respect to the cylindrical body, and an elastic pressing portion and a curved surface that are arranged opposite to the curved surface pressing portion and that are elastically deformed by the pressing force of the pressing portion. Temporary sealing means consisting of a heater that heats the pressure part at a temperature lower than the set temperature for causing regular heating and welding of the resin, and is located below the supply path by the bag length, and similarly. It is installed so that it can come into contact with and separate from the cylindrical body from both sides, and the set temperature for the temporary seal is set. In 於Ru-discharging seal mechanism providing the main sealing means comprising a heater for heating the filling and packaging, characterized in. 6. The temporary sealing means is a curved surface pressurizing portion formed of a cylindrical curved surface along the width direction of the tubular body, and a heat-resistant elastic material such as silicon rubber that is deformed by pressurizing by contact with the pressurizing portion. The liquid excluding seal mechanism according to claim 5, further comprising an elastic pressurizing unit. 7. A pair of squeezing rolls arranged between the squeezing roll and the temporary sealing means, contacting both sides when the content containing liquid is filled in the cylindrical body, and having an upper portion inclined outward to support a load. The liquid excluding seal mechanism according to claim 5, further comprising a bag regulating plate. 8. The filling package according to claim 5, wherein the sealing means is provided with a cutting means that operates on the tubular body at the same time when the heater is overheated and separates the tubular body from each other. Liquid removal seal mechanism in.