JP4996965B2 - Heat sealing equipment - Google Patents

Description

  The present invention relates to a heat sealing apparatus for manufacturing a package by heat-sealing a lid to an opening of a packaging container for containing food, etc., a heat sealing method using the apparatus, and a package obtained by the method. In particular, the present invention relates to a heat sealing apparatus capable of forming a plurality of heat seals having different heat seal strengths at once on a package.

  As a device for heat-sealing a packaging body comprising a packaging container for containing food and the like and a lid that is heat-sealed by closing the opening, devices of various structures have been known, including manual and automatic, and It has been put into practical use (for example, see Patent Document 1).

  2. Description of the Related Art In recent years, various types of packages with excellent convenience have been provided in which packages containing foods and the like and sealed lids are heated in a microwave oven at home or at a convenience store, and can be opened and eaten. It's getting on. In this type of microwave oven cooking packaging, steam is generated from the food inside by microwave heating, the internal pressure of the packaging rises, and any part of the packaging breaks as it is There is a risk of problems such as scattering of objects. In order to prevent this problem, when the inside of the packaging body is filled with steam, a part having a steam venting function that allows part of the packaging body to communicate with the outside and escape the steam to the outside has been put into practical use. .

  Among the packaging bodies having a vapor venting function, in a packaging body in which a lid made of a synthetic resin film is heat-sealed at the opening of a packaging container for containing food or the like, it does not peel off even when heated in a microwave oven The lid body is heat-sealed to the flange of the container opening with a sealing strength, and the inside of the package is heated by a microwave oven around the through-hole for steam venting formed in a part of the first heat-sealing part or the other part. Patent Document 2 discloses that a second heat seal portion having a relatively weak seal strength for peeling off steam when it is filled with steam is provided.

Moreover, although the uses of the package are different, Patent Document 3 discloses a technique for applying a two-stage heat seal to the package in order to improve the heat sealability between the container body and the lid. .
Japanese Utility Model Publication No. 3-120411 JP 2003-221078 A JP-A-5-132017

In the prior art disclosed in Patent Document 2, in order to form two heat seal portions having different sealing strengths, it is necessary to heat seal one part once and then heat seal another part again. was there. In the prior art disclosed in Patent Document 3, heat sealing is performed in two stages using two heat sealing apparatuses.
As described above, in the conventional technology, when two heat seal portions having different sealing strengths are formed on the package, two heat seal devices are required on the production line of the package, which increases the equipment cost and installs. There are problems such as extra space required.
In addition, the heat sealing process is performed twice, which complicates the work process and increases labor costs and maintenance costs, resulting in a high manufacturing cost.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat seal apparatus capable of forming a plurality of heat seal portions having different heat seal strengths by a single heat seal operation.

In order to achieve the above object, the present invention moves up and down between the standby position and the heat seal position by driving the drive body, and presses the plurality of heat seal portions of the package disposed immediately below the heat seal position. A heat sealing apparatus having a heat sealing head capable of simultaneously heat-sealing by a single sealing operation, wherein the heat sealing head has a plurality of heat sealing portions of a package with different pressing strengths and / or different pressing times. in have a plurality of sealing head for heat sealing are pressed on the heat-sealed portion of the package through the combination of the elastic body or elastic body interposed a singular between the driver and the heat seal head, The plurality of seal head portions press and heat seal the corresponding heat seal portions of the package with mutually different pressing forces, Head to provide a heat sealing apparatus, which comprises have a separate driver for each of the plurality of sealing head.

  In the heat sealing apparatus of the present invention, it is preferable that the packaging body has a packaging container in which an article to be packaged is accommodated and a lid body that is heat-sealed by closing the opening of the packaging container.

  In the heat seal device of the present invention, it is preferable that the plurality of heat seal portions of the package are the opening peripheral edge portion of the packaging container and the other portions.

  The plurality of heat seal portions of the package include at least one of a first heat seal portion provided around the opening flange of the packaging container and a through hole provided closer to the opening center than the opening flange. It is preferable to consist of a 2nd heat seal part.

The heat seal device of the present invention moves up and down between the standby position and the heat seal position by driving the drive body, and presses the plurality of heat seal portions of the package disposed immediately below the heat seal position to perform one time. A heat seal head capable of simultaneously heat-sealing by a sealing operation, wherein the heat seal head heat-seals a plurality of heat-sealed portions of a package with different pressing strengths and / or different pressing times. Since it has a portion, a plurality of heat seal portions having different sealing strengths can be formed on the package in one operation. Therefore, the heat seal device of the present invention can manufacture a package having a plurality of heat seal portions having different seal strengths with a single heat seal device, so that the equipment cost can be reduced compared to the conventional two-stage heat seal method. And the installation space can be reduced.
Moreover, since the heat sealing apparatus of this invention can manufacture the packaging body which has several heat seal parts from which sealing strength differs with one heat sealing apparatus, a work process can be simplified and the conventional two-step heat sealing system and In comparison, labor costs and maintenance costs can be reduced, and manufacturing costs can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the heat sealing apparatus of the present invention. In the figure, reference numeral 1 is a heat sealing device, 2 is a housing, 3 is an upper part of the housing, 4 is a lifting unit, 5 is a lifting base, 6 is a drive body, 7 is a heating plate, 8 is a heating plate support plate, 9 is Packaging body placement unit, 10 is a heat seal operation unit, 11 is a first guide pin, 12 is a second guide pin, 13 is a third guide pin, 14 is a first spring, 15 is a second spring, and 16 is a third Spring, 17 is a first seal head part, 18 is a second seal head part, 19 is a wound film, 20 is a film mounting table, 21 is a film serving as a lid, 22 is a connector for a film pressing plate, 23 Is a film presser plate, 24 is a coupling tool for a trimming blade, 25 is a trimming blade, 26 is a film take-up device, and 27 is a bucket in which a package is placed.

  The heat seal device 1 of the present embodiment moves up and down between the standby position and the heat seal position by driving the drive body 6, and presses the plurality of heat seal portions of the package disposed immediately below the heat seal position. A heat seal head capable of simultaneously heat-sealing with a single sealing operation, and the heat seal head heat-seals a plurality of heat-sealed portions of the package with different pressing strengths and / or different pressing times. The seal head portion 17 and the second seal head portion 18 are provided.

The heat seal device 1 of the present embodiment shown in FIG. 1 has at least a housing 2, a packaging body placement unit 9, and a heat seal operation unit 10 as main components. The first seal head portion 17 and the second seal head portion 18 are provided.
Hereinafter, each component will be described.

(Casing)
The casing 2 is provided with an entrance / exit of the packaging body mounting portion 9. As shown in FIG. 1, when a roll film 19 wound in a roll shape is used as a lid of a package, a film mounting table 20, a film inlet / outlet, and a film 21 drawn from the roll film 19 are packaged. A film take-up device 26 for transferring to the upper opening of the body packaging container, a take-up unit (not shown) for taking up the trimmed film skeleton, and the like are provided.

  When a sheet-like film cut in advance according to the opening flange of the packaging container or a molded lid material is used as the packaging material lid material, the lid material may be placed manually. Further, in order to continuously seal a large number of packaging containers, a device for automatically placing a sheet-like film or a molded lid on the opening flange of the packaging container may be added.

(Packaging place)
The package mounting portion 9 is for supporting the heat-sealed package in a heat-sealable state. For example, when the package is a bag, the heat-sealed portion is supported from below. It is a conveyor that can be placed on a support.
The method for transferring the package to the heat seal position is not limited. An automatic mechanism such as an intermittent operation by a conveyor, a reciprocating operation for carrying in and out of the apparatus, or a manual operation may be used.

In the present embodiment, the transport of the package in the package mounting unit 9 will be described as a structure that automatically or manually performs a reciprocating operation for carrying the package in and out of the apparatus.
The package mounting unit 9 includes a bucket 27 and a carry-in / carry-in unit, and is pulled out of the housing 2 when setting the packaging container for the heat-sealed package and when taking out the heat-sealed package. When the lid material is heat-sealed to the packaging container, it is arranged below the heat-sealing operation part 10 and supports the pressing of the first seal head part 17 and the second seal head part 18 against the container from below. It has a function.

  FIG. 2 is a diagram illustrating an example of a bucket used in the heat sealing apparatus 1 of the present embodiment, FIG. 2A is a plan view of the bucket 27, and FIG. 2B is an AA ′ portion in FIG. Sectional view, (c) is a sectional view taken along line BB ′ in (a), (d) is a sectional view taken along line CC ′ in (a), and (e) is DD ′ in (a). FIG.

  The bucket 27 of this example includes a container insertion concave portion 27a into which a packaging container of a package is inserted, a flange receiving portion 30 provided on the outside thereof for supporting an opening flange of the packaging container from below, and the flange receiving portion 30. The groove portion 29 provided outside the groove portion 29, the outer edge portion 28 provided outside the groove portion 29, and the left and right sides closer to the center than the flange receiving portion 30 are the same as or substantially the same height as the flange receiving portion 30. And an annular convex portion receiving portion 31 having a surface. A trimming blade 25 for trimming the film 21 along the outer edge of the opening flange after heat sealing is inserted into the groove portion 29 provided on the outer side of the flange receiving portion 30. Moreover, the outer edge part 28 is a site | part for fixing the film 21 by pinching | interposing the film 21 between them, when the film pressing plate 23 descend | falls.

  The carrying-in / carrying-in part uses moving means having a function of carrying in / out the bucket 27 from a position where the container before or after heat sealing is attached / detached to a position where the film is heat sealed to the opening of the package. it can. As such a moving means, for example, a rail on which the bucket 27 is placed and moved can be cited. The bucket 27 may be driven manually or may be an automatic mechanism including a motor and other driving units, a position fixing mechanism, and a control unit.

(Heat seal operation part)
The heat seal operation unit 10 moves up and down between the upper standby position and the heat seal position by driving the driving body 6. At the time of heat sealing, the film 21 is lowered toward the packaging body placement portion 9 disposed below, and the film 21 disposed on the packaging body and the packaging container placed on the packaging body placement portion 9 are opened. In the flange and other heat seal parts, the first and second seal head parts 17 and 18 heated to a predetermined temperature are sandwiched between the receiving parts of the bucket 27 and pressed to heat-seal, and the surroundings The film 21 has a function of trimming.

In the illustration shown in FIG. 1, the heat seal operation unit 10 includes an elevating unit 4, a hot platen unit, a film pressing unit, and a film trimming unit.
The elevating unit 4 includes a driving body 6 and an elevating base 5. As the driving body 6, an air cylinder, a combination of a motor and a cam, a hydraulic cylinder, or the like can be used.

In this embodiment, one driving body 6 is used. The air cylinder is attached to the upper part 3 of the housing, and raises and lowers the lifting base 5 connected to the lower part of the air cylinder.
The lifting base 5 is regulated in horizontal displacement and tilt by the first guide pins 11 and smoothly lifts and lowers the hot platen unit, film pressing unit, and film trimming unit without tilting in the horizontal direction.

  In this embodiment, one drive body 6 is used, but the first seal head portion 17 and the second seal head portion 18 are moved up and down independently using the second drive body. You may do it. If a plurality of driving bodies 6 are used, the cost and the size of the apparatus increase, but the pressing time can be changed independently in addition to the pressing forces of the first seal head portion 17 and the second seal head portion 18. Since it becomes possible, the freedom degree of adjustment of the seal strength in a plurality of places increases.

The hot platen unit includes a hot platen support plate 8, a hot platen 7, a first seal head portion 17, and a second seal head portion 18.
The hot platen support plate 8 is moved up and down by being connected to the lift base 5 by the second guide pins 12 so as to be movable up and down. At the time of heat sealing, a pressing force corresponding to the spring constant of the first spring 14 disposed around the second guide pin 12 is applied to the heat seal portion of the packaging body by lowering the lifting base 5.

  A cartridge heater 39 is embedded in the heating platen 7 as shown in FIGS. 4 to 8, and is adjusted to a predetermined temperature by a control means (not shown). The heating platen 7 may be heated by a method other than the cartridge heater 39.

  The 1st seal head part 17 heat-seals the opening flange of a package, and provides the 1st heat seal part around the opening flange. The first seal head portion 17 is connected to the heating platen 7 and moves up and down integrally with the heating platen support plate 8 and the heating platen 7. When the elevating base 5 is lowered by the driving body 6 during heat sealing, the first seal head portion 17 is a package placed on the flange receiving portion 30 of the bucket 27 with a pressing force according to the spring constant of the first spring 14. Press the opening flange of the body and the film placed on it. The first spring 14 is appropriately selected as a spring having a spring constant so that the pressing force becomes a predetermined value by adjusting the material, thickness, length, number of turns, and the like. Any number of springs may be used. In the present example, since the package body is substantially rectangular in plan view, four springs having the same spring constant are arranged and used so that the pressing force is uniform in the opening flange.

  As shown in FIG. 3, the second seal head portion 18 is for removing steam formed in a side wall convex portion 35 bulging from the longitudinal direction both sides of the opening flange of the packaging container 32 toward the center side. The film 21 is heat-sealed on the annular convex portion 37 around the through-hole 38, and the second heat-sealed portion is formed by heat-sealing with a sealing strength weaker than that of the first heat-sealed portion. The second seal head portion 18 is directly connected to the elevating base 5 or is vertically connected to a lower structure portion fixed to the elevating base 5 or connected to be movable up and down. At the time of heat sealing, it is pressed through a second spring 15 having an appropriately selected spring constant.

  In the present embodiment, the second seal head portion 18 is structured to be moved up and down by being connected to the up and down movement by the hot platen 7 and the third guide pin 13. When the hot platen 7 is lowered, it is pressed through a second spring 15 disposed around the third guide pin 13. In this example, since there are two through-holes 38 in the package, two second seal head portions 18 are arranged one by one corresponding to the annular convex portions 37 around each through-hole 38. At the time of heat sealing, the two second seal head portions 18 are pressed by the pressing force of the hot platen 7 (the elevating base 5 is lowered by the driving body 6 and pressed with a pressure corresponding to the spring constant of the first spring 14 ( The same as the pressing force of the first seal head portion 17), and the package placed on the annular convex portion receiving portion 31 of the bucket 27 with a pressing force buffered according to the spring constant of the second spring 15. The annular convex part 37 of a body and the film 21 arrange | positioned on it are pressed. As the second spring 15, a spring having a spring constant such that the pressing force becomes a predetermined value is appropriately selected. Any number of second springs 15 may be used. In this example, two second seal head portions 18 are prepared, and one second spring 15 having the same spring constant is used for each. These springs are not limited to coil springs, and other metal springs, air springs, and the like can be used.

  The sum of the spring constants of the second springs 15 used for the second seal head part 18 is made smaller than the sum of the spring constants of the first springs 14 used for the first seal head part 17. Otherwise, the pressing force of the second seal head portion 18 cannot be made smaller than the pressing force of the first seal head portion 17. The spring constant of the spring is a force obtained by bending the spring by 1 mm.

  In the present embodiment, since the second seal head portion 18 is pressed via the second spring 15 from the hot platen 7 pressed via the first spring 14 by the lowering of the lifting base 5, the driving body 6 is driven. The force is transmitted via the first spring 14 and the second spring 15, but the structure may be configured such that the force is directly pressed from the lift base 5 via the second spring 15 without using the first spring 14. If it carries out like this, the pressing force of the 1st and 2nd seal head parts 17 and 18 can be set up more freely.

The film pressing unit includes a film pressing plate 23 and a connecting tool 22 such as a rod. The connecting tool 22 connects the hot platen support plate 8 and the film pressing plate 23. The film pressing plate 23 is pressed by the first spring 14 and the third spring 16 that sandwich the hot platen support plate 8 as the elevating base 5 descends.
Note that this film pressing unit may not be necessary for a package that uses a sheet-type lid member or a molded lid member.

The film trimming unit includes a trimming blade 25 and a connecting tool 24 such as a rod, and the connecting tool 24 connects the lifting base 5 and the trimming blade 25. The trimming blade 25 is integrally connected to the elevating base 5 without a spring, and the film 21 is cut into a shape along the outer edge of the opening flange of the packaging body by lowering the elevating base 5. It has come in.
This trimming unit is not necessary for a package that uses a sheet-type lid member or a molded lid member.

  In the case of automatically operating the heat sealing device, a control device for automatically controlling the loading / unloading of the packaging body and the lifting / lowering operation of the driving body 6 can be provided in the housing 2. In this case, the heat sealing time can be set by a timer, and when the time-out occurs, the elevating base 5 is raised by driving the driving body 6. When the heat sealing and trimming are completed, the trimming unit, the film pressing unit, the second seal head, the first seal head, the heating plate, the heating plate support plate, and the lifting base are driven by the driving body and each spring subjected to compression deformation. It rises due to the stress and returns to the standby position.

The heat seal device 1 of the present embodiment moves up and down between the standby position and the heat seal position by driving the drive body 6, and presses the two heat seal portions of the packaging body arranged immediately below the heat seal position. A first seal head portion 17 and a second seal head portion 18 that can be heat-sealed simultaneously by one sealing operation, and these seal head portions 17 and 18 are provided at two locations on the package. Since the heat seal portion can be heat sealed with different pressing strength and / or different pressing time, the first and second heat sealing portions with different sealing strength can be formed on the package in one operation. Therefore, since the heat sealing apparatus 1 of this embodiment can manufacture the package which has two heat seal parts from which sealing strength differs with one heat sealing apparatus, compared with the conventional two-stage heat sealing system, installation cost The installation space can be reduced.
Moreover, since the heat sealing apparatus 1 of this embodiment can manufacture the packaging body which has two heat seal parts from which sealing strength differs with one heat sealing apparatus, a work process can be simplified and it is the conventional two-stage heat. Compared to the seal method, labor costs and maintenance costs can be reduced, and manufacturing costs can be reduced.

In addition, the heat seal apparatus 1 mentioned above is only a mere illustration of this invention, and this invention is not limited only to this illustration, A various correction and change are possible.
For example, the number of seal head portions may be two or more, and a plurality of seal heads that are heat-sealed under the same conditions may be provided.

  Next, an example of the heat sealing method of the package of this invention is demonstrated with reference to drawings. In addition, the manufacturing method by this example illustrates the case where the film 21 is heat-sealed as a cover material to the packaging container 32 of the packaging body shown in FIG. 3 using the heat sealing apparatus 1 shown in FIG. FIG. 3 is a perspective view showing an example of a packaging container 32 of a packaging body used in the manufacturing method of the present example, and FIGS. 4 to 8 are front views of essential parts sequentially showing a heat sealing operation in the heat sealing apparatus.

  The packaging container 32 used in the manufacturing method of the package of this example is manufactured by thermoforming a synthetic resin sheet such as polypropylene, and includes a bottom portion 33 and a side wall portion 34 erected from the periphery thereof. An opening flange 36 that is bent outwardly to form a first heat seal portion is formed, and two side wall convex portions 35 that bulge from both longitudinal sides of the opening flange 36 toward the center side are provided. Each side wall projection 35 is provided with a through-hole 38 for releasing steam, and an annular projection 37 serving as a second heat seal portion is provided around the through-hole 38. In addition, this invention is not limited to this illustration, The container for packaging with various shapes and dimensions other than this illustration can be used. Further, the number and arrangement position of the annular protrusions 37 are not limited to this example, and various changes can be made. The annular protrusions 37 are not provided around the through-holes 8 and are approximately the same height as the opening flange 36. It can also be a flat portion.

  In an actual heat sealing method, a desired packaged item, for example, various foods such as cooked or semi-cooked food, etc. are accommodated in the packaging container 32, and then transferred to a conveyor or the like (not shown). By means, it is transported to the package mounting part 9 of the heat seal device 1 and carried into the bucket 27. FIG. 4 shows a state in which the packaging container 32 that has already been packed is carried into the bucket 27 of the heat sealing apparatus 1 in the standby state. The opening flange 36 of the packaging container 32 is placed on the flange receiving portion 30 of the bucket 27, and the portion of the annular convex portion 37 is placed on the annular convex portion receiving portion 31 of the bucket 27. The first seal head portion 17 and the second seal head portion 18 of the heat seal apparatus 1 are heated to a predetermined temperature by the cartridge heater 39.

  Next, the driving body 6 is driven to lower the elevating base 5 toward a predetermined heat seal position. FIG. 5 shows a stage in the middle of lowering of the lift base 5. A synthetic resin film 21 serving as a lid is pulled out of the wound film 19 and reaches the film take-up device 26 through the bucket 27. In the middle of the descent shown in FIG. 5, first, the film pressing plate 23 is lowered, and the film 21 is pressed against the outer edge portion 28 of the bucket 27 in the region outside the opening flange 36 of the packaging container 32, so that the film 21 is displaced. To prevent.

  When the elevating base 5 is further lowered, the first seal head portion 17 and the second seal head portion 18 come into contact with the corresponding heat seal portions at the same time or one of them before the other. 4 to 8, the lower surface of the second seal head portion 18 is attached so as to protrude downward from the lower surface of the first seal head portion 17, and therefore, as shown in FIG. 6. In addition, the second seal head portion 18 first comes into contact with the film 21 on the packaging container 32, and the film 21 and the annular convex portion 37 are sandwiched between the annular convex portion receiving portion 31. Press to start heat sealing in this area. In addition, it is good also as a structure which the 2nd seal head part 18 contacts simultaneously with the 1st seal head part 17, or after.

  As shown in FIG. 7, almost without leaving the state shown in FIG. 6, the first seal head portion 17 is between the flange receiving portion 30 of the bucket 27 and the opening flange of the packaging container 32. 36, the film 21 is heat-sealed to the opening flange 36, and the first heat-sealed portion is provided around. Further, a second heat seal portion having a relatively weak seal strength is formed on the two annular convex portions 37 pressed by the second seal head portion 18.

  After the formation of the first and second heat seal portions is completed, the trimming blade 25 is lowered to trim the film 21 along the outer edge of the opening flange 36 as shown in FIG.

  Next, by driving the driving body 6, the lifting base 5 at the heat seal position is raised to the standby position. After the seal heads 17 and 18 are separated, the package that has been heat-sealed is unloaded from the bucket 27 and transferred to the next process such as a packaging process. And the next packaging container 32 is carried in to the bucket 27, and the process of FIGS. 4-8 is repeated.

  The heat sealing method for a package according to the present example uses the heat seal device 1 described above, and performs a single heat seal operation on a package having a first heat seal portion and a second heat seal portion having different seal strengths. Therefore, labor costs and maintenance costs can be reduced and manufacturing costs can be reduced as compared with the conventional two-stage heat seal method.

  FIG. 9 is a perspective view showing an example of a package manufactured by the heat sealing method described above. The packaging body 43 has a configuration in which an article to be packaged such as food is accommodated in the packaging container 32 shown in FIG. 3 and the film 21 is heat sealed to the opening flange 36. The film 21 that is a lid is heat-sealed on the upper surface of the opening flange 36 of the packaging container 32 with a sealing strength that does not break the packaging body when heated in a microwave oven, and the first heat-sealing portion 41 along the opening flange 36. The package is heat-sealed on the upper surface of the two annular protrusions 37 with a relatively weak seal strength that can be peeled off when the vapor pressure rises when the microwave oven is heated. 2 heat seal portions 42 are formed.

  For example, the package 43 is stored in a frozen state containing food, and when the consumer purchases it, defrosts it in a microwave oven, and further heats it, the heating is spread as far as possible inside the food. It is particularly preferably used in food packaging applications in which microwave cooking is performed for a predetermined time in order to prevent the film from being broken and spilled by steam generated during heating.

10 and 11 are cross-sectional views of the main parts for explaining the heat sealing state and the steam venting function of the package 43 shown in FIG.
When the package 43 shown in FIG. 9 is applied to a food packaging application for cooking by heating in a microwave oven, the package 43 before the consumer purchases and heats the microwave oven is placed on the opening flange 36 as shown in FIG. The formed first heat seal portion 41 and the second heat seal portion 42 formed on the annular convex portion 37 so as to close the through hole 38 are sealed with appropriate seal strength, and the through hole 38 is closed. As a result, the internal space of the package 43 (the space on the left side of the side wall protrusions 35 in FIGS. 10 and 11) is blocked from the package external space.

  And when putting this package 43 in a microwave oven and cooking it, the internal pressure of the package 43 increases with the vapor | steam 40 which generate | occur | produces with the temperature rise of the to-be packaged object accommodated in the package 43. Before the first heat seal portion 41 provided around the opening flange 36 is peeled off due to an increase in the internal pressure of the package, the film 21 is formed into an annular convex portion at the second heat seal portion 42 as shown in FIG. 37, the internal space of the package 43 communicates with the outside through the through hole 38, and the vapor 40 filled in the package 43 is exhausted to the outside through the through hole 38. When the film 21 of the second heat seal part 42 is peeled off, the film 21 of the first heat seal part 41 is not peeled off.

  The second heat seal part 42 discharges the steam 40 filled in the packaging body 43 to the outside, and at the time when generation of steam from the packaging body 43 is stopped along with the end of the microwave heating cooking, It is desirable that the film 21 be in close contact with the upper surface of the annular convex portion 37 around the through-hole 38 so that the inside of the package 43 can be maintained in a certain pressure and warm state.

  After heating the microwave oven, the consumer takes out the cooked package 43 from the microwave oven, puts it on a plate, etc., holds one end of the film 21 and removes the film of the first heat seal portion 41. The film 21 is peeled off and the heated food in the container can be eaten.

  Since the package 43 is obtained by the heat sealing method according to the present invention described above, the second heat seal portion 42 having a relatively weak seal strength with the filled steam when the package 43 is heated in a microwave oven. Can be released to the outside by peeling off, and the packaging body 43 having a steam release function that can be cooked by heating in a microwave oven without rupturing the packaging body 43 can be provided at a low manufacturing cost.

It is a front view which shows one Embodiment of the heat seal apparatus of this invention. The bucket used for the heat sealing apparatus of FIG. 1 is shown, (a) is a top view of a bucket, (b) is AA 'part sectional drawing in (a), (c) is B- in (a). B 'part sectional drawing, (d) is CC' part sectional drawing in (a), (e) is DD 'part sectional drawing in (a). It is a perspective view of the packaging container of the package used in an example of the heat sealing method of the present invention. It is a principal part front view of the heat seal apparatus for demonstrating an example of the heat seal method of this invention, and is the state in which the packaging container was carried in to the heat seal apparatus of a standby state. It is a principal part front view of the heat seal apparatus for demonstrating an example of the heat seal method of this invention, and is the state by which the film was fixed with the film pressing plate. It is a principal part front view of the heat seal apparatus for demonstrating an example of the heat seal method of this invention, and is a state which the 2nd seal head part contacted the package. It is a principal part front view of the heat-seal apparatus for demonstrating an example of the heat-sealing method of this invention, a 1st seal head part contacts a package body, and a heat seal is in a 1st, 2nd seal head part. It has been made. It is a principal part front view of the heat seal apparatus for demonstrating an example of the heat seal method of this invention, and is the state which trimmed the film after heat seal. It is a perspective view which shows an example of the package body of this invention. It is a principal part expanded sectional view of the package of FIG. It is a principal part expanded sectional view which shows the vapor release state at the time of heating the package of FIG. 9 with a microwave oven.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Heat seal apparatus, 2 ... Housing | casing, 3 ... Upper part of housing | casing, 4 ... Elevating / lowering unit, 5 ... Elevating base, 6 ... Drive body, 7 ... Heating board, 8 ... Heating board support plate, 9 ... Packaging body mounting , 10... Heat seal operation unit, 11... First guide pin, 12... Second guide pin, 13... Third guide pin, 14... First spring, 15. 1st sealing head part, 18 ... 2nd sealing head part, 19 ... Rolled film, 20 ... Film mounting table, 21 ... Film, 22 ... Connecting tool, 23 ... Film presser plate, 24 ... Connecting tool, 25 ... Trimming Blade, 26 ... Film take-up device, 27 ... Bucket, 28 ... Outer edge part, 29 ... Groove part, 30 ... Flange receiving part, 31 ... Annular convex part receiving part, 32 ... Packaging container, 33 ... Bottom part, 34 ... Side wall part, 35 ... side wall convex part, 36 ... opening franc , 37 ... annular projection, 38 ... through hole, 39 ... cartridge heater, 40 ... vapor, 41 ... first heat sealed portion, 42 ... second heat sealed portion, 43 ... package.

Claims (4)

Ascending / descending between the standby position and the heat seal position by driving the drive body, pressing a plurality of heat seal portions of the package disposed immediately below the heat seal position, and simultaneously heat-sealing by one sealing operation. A heat seal device having a heat seal head capable of
The heat sealing head, a plurality of heat-sealed portion of the package have a plurality of sealing head for heat sealing at different pressure intensities and / or different pressing time, is interposed between the drive member and the heat sealing head It is pressed against the heat seal part of the package body through a single elastic body or a combination of a plurality of elastic bodies, and the plurality of seal head parts press the corresponding heat seal parts of the package body with mutually different pressing forces. Heat seal,
The heat sealing head, the heat sealing device, which comprises have a separate driver for each of the plurality of sealing head. The heat sealing apparatus according to claim 1 , wherein the packaging body includes a packaging container in which an object to be packaged is accommodated, and a lid body that is heat-sealed by closing an opening of the packaging container. . The heat seal device according to claim 2 , wherein the plurality of heat seal portions of the package are an opening peripheral edge portion of the packaging container and other portions. A plurality of heat seal portions of the packaging body are provided with a first heat seal portion provided around the opening flange of the packaging container, and at least one first hole having a through hole provided closer to the center of the opening than the opening flange. The heat seal device according to claim 2 , comprising two heat seal portions.

Images