KR101248725B1 - Sealed container - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a high contaminant aptitude in sealing containers such as food and food containers for sealing a cover by heat melting such as laser welding, and to improve the sealing property and to join the container body and the cover. It is to increase the intensity. The sealed container according to the present invention has a container body (1) having an inlet (9) and a distortion in itself when the inlet (9) is closed, and with respect to the container body (1) by distortion stress. It has the cover 3 formed of the plastic material which makes the contact | adherence part 4 of a pressurized state, and the said contact part 4 becomes a sealing part, and the said contact part 4 is heat-sealed.

Cover, Bent, Sealed Container, Hanging, Rib

Description

Sealed container {SEALED CONTAINER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed container in which a lid attached to an inlet portion of a container body is sealed by heat fusion, and more particularly to a structure of the inlet portion and a lid.

Various containers, such as a bottle, a can, and a plastic container, are known in a sealed container, for example, a container for drinks. In recent years, cans and plastic containers have been widely used in view of convenience such as good handling.

As for the plastic container, it is difficult to perform a seaming step, and thus, a plastic container that is sealed by seaming like a metal can container for beverage is not in circulation. In the plastic container, the most popular container is a PET (polyethylene terephthalate) bottle. In a PET bottle, the method of screwing a cap into a bottle inlet part is used as a sealing system. However, this cap is a major cost increase factor in the whole container. Moreover, since a cap is mainly made of PP (polypropylene), it becomes the obstacle of recycling.

In recent years, the bottle-shaped can container which employ | adopted the system which puts a cap in the bottle entrance part like a PET bottle is also distributed.

By the way, the sealing technique which performs sealing of a can by laser welding for a metal can is disclosed (for example, refer patent documents 1-3).

Patent Document 1: WO02 / 42196 A2 Publication

Patent Document 2: Japanese Patent Laid-Open No. 63-194885

Patent Document 3: Japanese Patent Application Laid-Open No. 61-289932

When attempting to seal a sealed container such as a beverage or food container by heat melting, including laser welding, the surface to which the liquid (for example, water sprayed on the device) or the contents of the surrounding environment at the time of sealing is to be fused. In many cases, it is necessary to fusion in the state of being caught. At this time, the welding condition is changed. After such a change in the fusion conditions, a wide range of suitable conditions is expressed as high aptities of the contaminants. And when sealing is attempted by laser welding, the fusion | melting conditions which can acquire a composite matter suitability are not known so far. In addition, there is no knowledge of how the structure of the container, in particular the structure of the inlet and the lid, should be made in order to increase the contaminant aptitude.

When the PET bottle is sealed by laser welding, for example, the inventors irradiate a general laser spot, and when heating and melting are started at the fusion start site, the contaminants of the fusion surface are separated from the fusion start site on the fusion surface. I could see the movement towards. As a result, when fusion is completed by one week of laser irradiation, significant blurring occurs in the fusion area, which adversely affects the sealing property and the bonding strength between the container body and the lid. The contaminants also move as if they are pushed out of the fusion surface by the pressure generated by heating and fusion. As a result, it is possible to discharge the impurities completely completely from the fusion surface, but at this time, since the entanglement takes away a certain amount of heat from the fusion surface, it is necessary to adjust the output of the laser.

Accordingly, an object of the present invention is to impart high contaminant aptitude by devising a structure of an inlet portion and a lid for a sealed container such as a beverage or food container sealed by heat melting, including laser welding. . And it aims at making sealing property high and also bonding strength of a container body and a cover high.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining the said subject, (1) fixing the fusion | fusing part so that a contaminant may not move to another fusion | fusing part during fusion | melting, (2) fusion | melting so that a constriction can move to other than a fusion | fusing part during fusion | melting. (3) find out that it is important to seal the container to form the structure of the part to be made and (3) perform laser irradiation with the amount of heat lost to the workpiece, and find a container having the structure of the inlet portion and the lid reflecting these. In addition, an appropriate laser irradiation method was found. That is, the sealed container which concerns on this invention produces a distortion in itself when the container body which has an inlet part and the said inlet part is closed, and produces the contact | adherence part of a pressurized state with respect to the said container body by the stress which moderates the said distortion. And the cover formed of a plastic material, wherein the close contact portion is a sealing portion, and the close contact portion is heat-sealed. When the cover is attached to the container body, the close contact portions are in contact with each other in a pressurized state, and therefore, no foreign matter enters the close contact portion.

In the sealed container which concerns on this invention, the annular rib is provided in the outer wall of the said inlet part in parallel with the edge of the said inlet part, The annular ring which forms the contact part with the said rib is provided in the edge of the said cover, The annular convex portion or concave portion is provided on the edge side of the inlet portion than the rib among the outer walls of the inlet portion, and the ring provided with the inlet portion is spaced from a ring provided at the edge of the lid among the inner wall of the lid portion. The case where the annular recess or convex part is provided in the site | part which becomes a space | interval a little longer than the space | interval of a shaped convex part or recess part and the said rib, and the contact | adherence part of the said rib and said ring is heat-sealed is included. . One form of sealed container. In the case of this container, since the contact | adherence part can be seen without covering up from the top of a container, it can fuse | paste by irradiating a laser from upper direction downward. Therefore, the laser irradiation apparatus can be simplified.

In the sealed container which concerns on this invention, the contact surface of the inner wall surface of the said cover and the edge of the said inlet part is provided, and the annular convex part or the recessed part is provided in the outer wall of the said inlet part in parallel with the edge of the said inlet part, The said cover An annular recess or a convex portion is provided at a portion of the inner wall of the inner wall of which the interval between the contact surface is slightly shorter than an interval between the edge of the inlet portion and the annular convex portion or the recess portion provided in the inlet portion, The case where the contact part of the annular convex part or recessed part provided in the outer wall of the said inlet part, and the annular recessed part or convex part provided in the inner wall of the said cover is heat-sealed is included. One form of sealed container.

In the sealed container which concerns on this invention, the said cover has the curved part which pinches the surface and the back surface of the edge of the said inlet part, and the case where the close part of the said curved part and the said container body is heat-sealed is included. One form of sealed container.

In the sealed container which concerns on this invention, it is preferable that the contact surface of the inner wall surface of the said cover and the edge of the said inlet part is provided, and the said contact surface is heat-sealed. The welding strength of the cover can be improved.

In the sealed container according to the present invention, it is preferable that the container body and the lid are in close contact with each other in the close contact portion such that the contents do not leak when the lid is reattached to the inlet of the container body after opening. . Resealability of the container can be obtained.

In the sealed container according to the present invention, the distance between the heat-sealed contact portion and the edge of the lid is 10 mm or less, and the inner wall face adjacent to the edge of the lid is separated from the outer wall face of the container body. desirable. The solution which soaks around the contact part can be discharged during welding.

In the sealed container which concerns on this invention, it is preferable that the said cover and the said container body are shape | molded with plastic resin.

In the sealed container which concerns on this invention, it is preferable that the said contact part is heat-sealed by the laser welding method. The boundary between the welded portion and the non-fused portion is clear, and high precision welding is possible.

In the sealed container which concerns on this invention, the said contact part is formed from the material which absorbs a laser beam, the paint which absorbs a laser beam is apply | coated to the said contact part, or the material which absorbs a laser beam in the said contact part It is preferable that the object which consists of these is arrange | positioned. It can fuse with laser beam of small energy density.

In the sealed container which concerns on this invention, when heat-sealing by the laser welding method, it is preferable that the said lid | cover and the said container body are shape | molded with polyethylene terephthalate resin.

The sealed container of this invention has a high contaminant aptitude by devising the structure of an inlet part and a lid | cover. Thereby, sealing property can be improved by heat welding, such as a laser welding method, and the joint strength of a container body and a cover can be made high.

Fig. 1 is a schematic view of a sealed container according to the first embodiment, and Fig. 1 (a) is a longitudinal cross-sectional schematic view of the vicinity of an inlet when the lid is attached to the container body, and Fig. 1 (b) is an external view as viewed from the A direction. Fig. 1C is a perspective overview of the lid as seen from the B direction.

2 is a diagram showing a schematic diagram of a sealed container according to a second embodiment.

3 is a diagram showing a schematic diagram of a sealed container according to a third embodiment.

4 is a diagram illustrating a schematic view of a sealed container according to a fourth embodiment.

5 is a flowchart showing one embodiment of a manufacturing method of a sealed container according to the present embodiment.

[Description of Symbols]

100, 200, 300, 400: sealed container

1, 61: container fuselage

2, 16, 18: ring-shaped convex part

3, 62: cover

4 contact part

5, 7: edge

6: rib

8: ring-shaped ring

9: entrance

10: annular second convex portion

11, 15, 17: annular recess

12: annular second recessed portion

13: inner wall portion of the cover

14: locking part

19: contact surface

20: bend

21: separation part

23: force to press the rib

24: the force that the inner wall surface of the cover presses the edge

25: the force to bend the front and back of the edge of the bend

26 handle

63a: cover conveying means

63b: cover feed means

64: cover arrangement means

65: laser generating means

66: close contact

70: bad container exclusion means

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment is shown and this invention is demonstrated in detail, this invention is limited to these description and is not interpreted. First, the sealed container which concerns on this embodiment is demonstrated, referring FIGS. In addition, the same code | symbol was attached | subjected to the same member and the same site | part.

The sealed container according to the present embodiment has a container body having an inlet portion and a distortion in itself when the inlet portion is closed, thereby creating a close contact portion in a pressurized state with respect to the container body by stresses that alleviate the distortion. In addition, the close contact portion has a lid formed of a plastic material to be a sealing portion, characterized in that the close contact portion is heat-sealed. For example, the lid is formed in a cylindrical shape with an upper surface attached thereto, the inlet portion of the container body is cylindrical, and the lid is mounted so that the inlet portion is covered from the outside. In this case, the cover may be a food cover or a food cover. The close contact portion of the container body and the lid is always in a pressurized state. This close contact portion is called a seal. By the above structure, not only the contents do not overflow, but also the coarse matters such as the contents and the sprinkled water can be removed from the contact surface that is the contact portion. Therefore, when the adhesion part is heat-sealed, since there are no impurities on the adhesion surface, a phenomenon that adversely affects the heat-sealing such as vaporization of the foreign matter or the heat by laser is hardly generated. By the way, in order to always make a contact part in a pressurized state, in the sealing container which concerns on this embodiment, the cover is formed of a plastic material, and when the inlet part is closed by a cover, the cover itself is distorted, and the said distortion is alleviated. It is used as a force for pressing stress. EMBODIMENT OF THE INVENTION Hereafter, embodiment of the sealed container which implement | achieves this effect is described and demonstrated. Of course, this invention is limited to these embodiment only and is not interpreted.

(1st embodiment)

1, the schematic of the sealed container which concerns on 1st Embodiment was shown. Figure 1 (a) is a vertical cross-sectional schematic diagram of the vicinity of the inlet when the lid is mounted on the container body, Figure 1 (b) is an external view as viewed from the A direction, Figure 1 (c) is a lid as seen from the B direction Isometric overview of the. In the sealed container 100 which concerns on 1st Embodiment, the annular rib 6 is provided in the outer wall of the inlet part 9 of the container body 1 in parallel with the edge 5 of the inlet part 9, The annular ring 8 which forms the rib 6 and the contact | adherence part 4 is provided in the edge 7 of the lid | cover 3, and it enters rather than the rib 6 among the outer walls of the inlet part 9; The annular convex part 2 is provided in the edge 5 side of a part, and the space | interval with the ring 8 provided in the edge 7 of the cover 3 among the inner walls of the cover 3 is the inlet part ( The annular recessed part 11 is provided in the site | part which becomes a space | interval a little longer than the space | interval of the annular convex part 2 and rib 6 provided in 9). And the close contact part 4 of the rib 6 and the ring 8 is heat-welded.

In the sealed container 100, the inner diameter is designed so that the lid 3 may slightly tighten the side wall of the inlet portion 9 from the surroundings at the time of mounting. Here, the gap between the annular recess 11 and the ring 8 is formed to be slightly longer than the gap between the annular convex portion 2 and the rib 6 provided in the inlet portion 9. Therefore, in the part of the cover 3 fitted in the annular recess 11 and the ring 8, the tightening force of the cover 3 causes distortion in the vertical direction as seen in FIG. 1 (a). Compressive stress occurs. Since the lid 3 is made of a plastic material, a force for pushing the ring 8 downward, that is, a force 23 for pressing the rib 6, is generated to alleviate the distortion of the compression. Thereby, the contact part 4 will be in a pressurized state.

The lid 3 is made of a plastic material, but is specifically made of plastic resin, metal or these composite materials. The metal is, for example, aluminum, iron or an alloy containing these as a main component. As the plastic resin, for example, polyethylene terephthalate resin (PET), glycol modified polyethylene terephthalate resin (PETG), polybutylene terephthalate resin, polyethylene naphthalate resin, polyethylene resin, polypropylene resin (PP), cycloolefin co Polymer resin (COC, cyclic olefin copolymer), ionomer resin, poly-4-methylpentene-1 resin, polymethyl methacrylate resin, polystyrene resin, ethylene-vinyl alcohol copolymer resin, acrylonitrile resin, polyvinyl chloride Resin, polyvinylidene chloride resin, polyamide resin, polyamideimide resin, polyacetal resin, polycarbonate resin, polysulfone resin, or tetrafluoroethylene resin, acrylonitrile-styrene resin, acrylonitrile-butadiene-styrene resin to be. Among these, PET is particularly preferable. PET has a track record as a material for containers for beverages and foods, and in the case of fusion by laser welding, it has no absorbency to laser. Therefore, PET is adhered to the contact surface of the contact portion by absorbing the laser light. The area around the surface can be heated directly.

The container body 1 is formed of plastic resin, glass, ceramics, metal or a composite material thereof. As for the shape, a bottle shape is preferable. Moreover, in order to seal a container by heat fusion, it is not necessary to thicken a cover compared with a container body. By forming the container body 1 and the lid | cover 3 with plastic resin, it is possible to join these with little energy.

In the sealing container 100, further, the annular second convex portion 10 is provided above the convex portion 2 among the outer walls of the inlet portion 9, and the second concave portion is provided on the inner wall of the lid 3. (12) is provided. Here, the cover (so that the space between the inner wall portion 13 and the second recessed portion 12 of the cover 3 in contact with the edge 5 is slightly shorter than the space between the edge 5 and the second convex portion 10). 3) is formed. Thereby, the contact surface of the edge 5 and the inner wall part 13 is formed, and it will always be in a pressurized state in this contact surface. Therefore, the contaminants are also removed from this contact surface, and the adverse influence by the contaminants is eliminated, and heat fusion is facilitated. In addition, the adhesive strength between the container body 1 and the lid 3 is improved.

Moreover, in the sealing container 100, the handle 26 is provided in order to improve the opening property of the cover 3. As shown in FIG. Moreover, the locking part 14 with respect to the rib 6 is provided so that internal pressure may be applied to a container and the cover 3 does not fly. If the lid 3 is inadvertently opened, the locking portion 14 prevents the lid 3 from popping out.

(Second Embodiment)

2, the schematic of the sealed container which concerns on 2nd Embodiment was shown. The longitudinal cross-sectional schematic of the inlet part vicinity when a cover is attached to a container body is shown. In the sealed container 200 which concerns on a 2nd aspect, the annular rib 6 is provided in the outer wall of the inlet part 9 of the container body 1 in parallel with the edge 5 of the inlet part, and the lid 3 is provided. The annular ring 8 which forms the rib 6 and the contact | adherence part 4 is provided in the edge part 7 of the inlet part of the inlet part 9 rather than the rib 6 among the outer walls of the inlet part 9. The annular recessed part 15 is provided in the edge 5 side, and the space | interval with the ring 8 provided in the edge 7 of the cover 3 among the inner walls of the cover 3 is the inlet part 9 The annular convex part 16 is provided in the site | part which becomes a space | interval a little longer than the space | interval of the annular recessed part 15 and the rib 6 provided in). And the close contact part 4 of the rib 6 and the ring 8 is heat-sealed. 2nd Embodiment and 1st Embodiment differ in the point which the relationship of a convex part and a recessed part is reversed.

In the sealed container 200, the inside diameter is designed so that the lid 3 may slightly tighten the side wall of the inlet part 9 from surroundings at the time of attachment. Here, the cover 3 is formed so that the space | interval of the annular convex part 16 and the ring 8 may become a space | interval a little longer than the space | interval of the annular recessed part 15 and the rib 6. Therefore, in the part of the cover 3 fitted in the annular convex part 16 and the ring 8, by the clamping force of the cover 3, distortion occurs in a vertical direction as seen in FIG. do. Since the lid 3 is made of a plastic material, a force for pushing the ring 8 downward, that is, a force 23 for pressing the rib 6, is generated to alleviate the distortion of the compression. Thereby, the contact part 4 will be in a pressurized state.

The material of the lid | cover 3 and the container body is the same as that of the case of 1st Embodiment. Also in the sealed container of 2nd Embodiment, the contact surface of the inner wall surface of the lid 3 and the edge 5 of the inlet part 9 may be provided (not shown), and the contact surface may be heat-sealed. In addition, a handle (not shown) and a locking portion (not shown) may be provided.

(Third embodiment)

3, the schematic of the sealed container which concerns on 3rd Embodiment was shown. The longitudinal cross-sectional schematic of the inlet part vicinity when a cover is attached to a container body is shown. In the sealed container 300 which concerns on 3rd Embodiment, the contact surface 19 of the inner wall surface of the cover 3 and the edge 5 of the inlet part 9 is provided, and an inlet part is provided in the outer wall of the inlet part 9. The annular recessed part 17 is provided in parallel with the edge 5 of (9). Moreover, the annular convex part 18 is provided in the inner wall surface of the cover 3. Moreover, the space | interval with the contact surface 19 of the inner wall of the lid | cover 3 is a space | interval slightly shorter than the space | interval of the annular recessed part 17 provided in the edge 5 of the inlet part 9, and the inlet part 9. The annular convex part 18 is provided in the site | part to become. And the close contact part 4 of the annular recessed part 17 provided in the outer wall of the container body 1, and the annular convex part 18 provided in the inner wall of the lid | cover 3 is heat-sealed.

In the third embodiment, similarly to the relationship between the second embodiment and the first embodiment, the relationship between the convex portion and the concave portion may be reversed as a similar form of the third embodiment (not shown).

In the sealed container 300, the inner diameter is designed so that the lid 3 may slightly tighten the side wall of the inlet portion 9 from the surroundings at the time of mounting. Here, the gap between the contact surface 19 and the annular convex portion 18 provided on the lid 3 is annular recessed portion 17 provided at the edge 5 of the inlet portion 9 and the inlet portion 9. The cover 3 is formed so that it may become space | interval slightly shorter than the space | interval. Therefore, in the part in which the contact surface 19 and the annular convex part 18 were fitted in the cover 3, the clamping force of the cover 3 produces distortion in a vertical direction as shown in FIG. do. Since the lid 3 is formed of a plastic material, in order to alleviate the distortion of this tension, a force 24 is generated in which the inner wall surface of the lid 3 presses the edge 5, and the edge 5 is covered by the lid ( It contacts the inner wall surface of 3). On the other hand, the annular convex portion 18 of the lid 3 and the annular recessed portion 17 of the container body 1 come into close contact with each other, and the close contact portion 4 is in a pressurized state.

The material of the lid | cover 3 and the container body 1 is the same as that of the case of 1st Embodiment. Also in the sealed container of 3rd Embodiment, the contact surface 19 may be heat-sealed. In addition, a handle (not shown) and a locking portion (not shown) may be provided.

(Fourth Embodiment)

4, the schematic of the sealed container which concerns on 4th Embodiment was shown. The longitudinal cross-sectional schematic of the inlet part vicinity when a cover is attached to a container body is shown. In the sealed container 400 which concerns on 4th Embodiment, the cover 3 has the curved part 20 which fits the surface and the back surface of the edge 5 of the inlet part 9 of the container body 1, and the curved part 20 ) And the adhesion part 4 of the container body 1 are heat-sealed.

In the sealed container 400, the bent portion 20 is distorted by fitting the front and back surfaces of the edge 5, and the close portion 4 of the bent portion 20 and the container body 1 to alleviate this distortion. This is a pressurized state. Reference numeral 25 in FIG. 4 denotes a force for the curved portion 20 to sandwich the front and rear surfaces of the edge 5.

The material of the lid | cover 3 and the container body 1 is the same as that of the case of 1st Embodiment. In the sealed container of the fourth embodiment, a handle (not shown) and a locking portion (not shown) may be provided.

In the sealed container of 1st Embodiment-4th Embodiment, when the lid | cover 3 is reattached to the inlet part 9 of the container body 1 after opening, the contact | adherence part 4 so that content does not leak. In this case, the container body 1 and the lid 3 are preferably in close contact with each other. Resealability of the container can be obtained. In the said embodiment, the contact part 4 is in the pressurized state. The content can be prevented from leaking by adjusting the thickness of the lid 3 and the magnitude of the inner diameter of the lid 3 and the outer shape of the inlet 9 so as to make the pressurized state the appropriate pressure.

In the sealed container of 1st Embodiment-4th Embodiment, the distance of the heat-sealed adhesion part 4 and the edge 7 of the lid | cover 3 is 10 mm or less, and is attached to the edge 7 of the lid | cover 3 It is preferable that the adjacent inner wall surface and the outer wall surface of the container body 1 are spaced apart. For example, FIG. 2 shows a partial enlarged view of C. FIG. The space | interval part 21 of the inner wall surface of the cover 3 and the outer wall surface of the container body 1 is made into the distance X between the close_contact | adherence part 4 and the edge 7 of the lid | cover 3 at 10 mm or less. ). Also in other embodiment, you may provide the distance X and the space | interval part 21 similarly. By this structure, the liquid which wets the circumference | surroundings of the contact part 4 can be discharged during fusion | melting.

In the sealed container of 1st Embodiment-4th Embodiment, it is preferable that the contact part 4 is heat-sealed by the laser welding method. Compared to the case where the heater is heat-sealed as a heat source, the boundary between the welded portion and the non-fused portion is clear and high precision welding is possible.

In the sealed container of 1st Embodiment-4th Embodiment, the contact part 4 is formed with the material which absorbs a laser beam, or the contact part 4 is apply | coated the paint which absorbs a laser beam, or An object made of a material that absorbs laser light may be disposed in the close contact portion 4. When fusion | melting by a laser welding method, even if a to-be-adhered object does not absorb a laser, the periphery of a close_contact | adherence surface can be heated directly by giving the absorptive coloring with respect to a laser beam to the close_contact | adherence surface of a contact part. In order to form an adhesive part with the material which absorbs a laser beam, dye or a pigment is included in a plastic resin, for example, and a container body, a cover, or both are formed. In order to apply | coat the adhesive part 4 with the coating material which absorbs a laser beam, the coating material is printed by various printing methods, for example. As a material which absorbs a laser beam arrange | positioned at the close_contact | adherence part 4, the coating material is apply | coated to the same material as a container body or a cover, or what contained dye or a pigment, for example. Thus, by providing the absorption part with respect to a laser beam, the absorption rate of a laser becomes high and it becomes possible to carry out laser welding with little energy. A dye or a pigment is a metal material, a ceramic, or an organic pigment, for example, and absorbs a laser beam. It is preferable to adjust the wavelength, laser power, and laser scanning speed of a laser beam by the absorption degree of an absorption part with respect to a laser beam.

Next, the sealing method of the sealed container which concerns on this embodiment is demonstrated, referring FIG. 5 is a flowchart showing one embodiment of a manufacturing method of a sealed container according to the present embodiment. In step S1, the container body 61 which filled the content is introduce | transduced into a laser welding machine by conveyance means (not shown), such as a conveyor. At this time, when the contents are foamed, bubble removal is performed and carbon dioxide gas purge or nitrogen gas purge is performed.

Next, in step S2, the cover 62 is conveyed to the cover supply means 63b by the cover conveyance means 63a. The lid supply means 63b supplies the lid 62 to one container body 61 up to the inlet portion.

Next, in Step S3, the lid arranging means 64 attaches the lid 62 to the inlet portion of the container body 61. Thereby, the contact surface becomes a pressurized state in the contact | adherence part of a cover and a container body.

Next, in step S4, the laser is irradiated to the close contact portion 66 of the container body 61 and the lid 62 by the laser generating means 65. Here, the entirety of the contact portion 66 can be fused while the laser is irradiated in a spot shape or a linear shape to rotate the container 61 at the central axis for one week (rotating means of the container 61 is not shown).

At the time of laser irradiation, it is preferable that the laser intensity is monitored by monitoring a laser output. In addition, it is preferable that the irradiation position of a laser is monitored by monitoring light emission or heat_generation | fever by temperature sensors, such as an optical sensor or an infrared sensor. Welding of the plastic is preferably monitored by monitoring light emission or heat generation by a light sensing sensor or a temperature sensor. You may use together image sensors, such as CCD.

Examples of the laser oscillation element assembled to the laser generating means 65 include gas lasers such as semiconductor lasers and carbon dioxide lasers, YAG lasers, and materials of the container body and cover for laser welding, laser irradiation movement speed, irradiation spot shape, and the like. It is appropriately selected by various parameters. The wavelength of a laser beam is 800-1000 nm, for example. When laser-welding a plastic container or a can container of a bottle shape, a semiconductor laser is preferable. It is preferable that the energy density of the laser beam irradiated to the close contact portion is, for example, 150 J per 1 cm 2 of the fusion area. Fusion can be terminated without generating heat deformation.

Here, in order to raise the absorption rate of a laser beam, it is preferable to provide the process of providing the absorption part of a laser beam in a close part. Laser welding can be performed with high accuracy even if the contour or undulation of mechanical contact along the absorbing part is complicated. This is because the laser light can tighten the irradiation spot, and the place where the absorption part is provided is mainly welded. This step may be any time before laser irradiation, and may be provided between step S1, step S2, or step S3 before step S1. In addition, this process is effective when welding a material which does not have an absorption band with respect to a laser beam, and therefore is not an essential process. That is, when a junction part absorbs a laser beam like some color bottles, it can carry out laser welding only by irradiating a laser.

Next, in step S5, the container of sealing failure is removed by the defective container removing means 70. It is preferable to perform determination of sealing failure based on the visual inspection result of an image inspection machine (not shown) with the result of the said monitoring.

In the conventional seaming step of the metal can, it is difficult to determine whether or not the container is properly sealed at the time when the seaming step is actually performed. Therefore, although the inspection result before manufacture start was favorable, when the sealing defect in the seaming process generate | occur | produces, it will lead to defect discovery after time passes considerably rather than actual defect occurrence. In such a case, the number of containers requiring disposal and the down time of the production apparatus become very large. On the other hand, according to the manufacturing method of the sealing container which concerns on this embodiment, since it can detect in a very short time whether the welding process was appropriately performed, the said disadvantage in the seaming process of a metal can does not arise.

In the present invention, instead of the laser welding method, the following welding method can also be applied. That is, the contact | adherence part is fused by the impulse sealing method, the high frequency welding method, the vibration welding method, the spin welding method, the ultrasonic welding method, the hot air welding method, or the heat sealing method, and a sealing container is manufactured.

The impulse sealing method is a method in which a tight portion is rapidly welded by flowing a strong current to a ribbon heater. The high frequency welding method is a welding method by internal heating in which a high frequency current is absorbed in a close contact portion having a large dielectric constant and dielectric loss tangent. Use a film with a high dielectric constant and dielectric loss tangent. The vibration welding method is a welding method in which the adhesion parts are rubbed with each other to generate heat by fusion bonding instead of spin. The spin welding method is a method in which the adhesion part is rotated and rubbed against each other to be fusion welded by frictional heat. Ultrasonic welding is a method of melt-bonding an adhesive part by applying ultrasonic vibration energy. The hot air welding method is a method in which air or gas is sent to a heated heater and blown to a close contact portion for welding. The heat seal method is a method of welding by pressurizing and heating in a state where a close contact portion is sandwiched between heating plates. Each welding method can be suitably selected and used according to the shape of a container.

Claims (11)

A container body having an inlet; When the inlet is closed, a cover is formed of a plastic material, which causes distortion in itself, thereby creating a close contact portion in a pressurized state with respect to the container body by a stress that mitigates the distortion, and the close contact portion is made of a plastic material. Have, The adhesion part is heat-sealed, Ring-shaped ribs are installed on the outer wall of the inlet parallel to the edge of the inlet, An annular ring is formed on the edge of the cover to form a close contact with the rib, Of the outer wall of the said inlet part, an annular convex part or a recessed part is provided in the edge side of the said inlet part rather than the said rib, An annular recess in a portion of the inner wall of the lid such that an interval between the ring provided at the edge of the lid is an interval slightly longer than an interval between the annular protrusion or recess provided in the inlet portion and the rib. Or provide convexity, The sealing container characterized in that the close contact portion between the rib and the ring is heat-sealed. A container body having an inlet; When the inlet is closed, a cover is formed of a plastic material, which causes distortion in itself, thereby creating a close contact portion in a pressurized state with respect to the container body by a stress that mitigates the distortion, and the close contact portion is made of a plastic material. Have, The adhesion part is heat-sealed, Providing a contact surface between an inner wall surface of the cover and an edge of the inlet portion, An annular convex or concave portion is provided on an outer wall of the inlet parallel to an edge of the inlet; An annular recess or a convex portion is provided at a portion of the inner wall of the lid where the distance between the contact surface is slightly shorter than an interval between the edge of the inlet portion and the annular convex portion or the recess portion provided in the inlet portion. and, The sealing container characterized in that the contact portion between the annular convex portion or the concave portion provided on the outer wall of the inlet portion and the annular concave portion or the convex portion provided on the inner wall of the lid is heat-sealed. The contact surface of the inner wall surface of the said cover and the edge of the said inlet part is provided, Sealing container characterized in that the contact surface is heat-sealed. The container body and the lid according to claim 1 or 2, wherein the container body and the lid are in close contact with each other in such a close portion that the contents do not leak when the lid is reattached to the inlet of the container body after opening. The sealed container characterized by the above-mentioned. The distance between the heat-sealed contact portion and the edge of the lid is 10 mm or less, and the inner wall face adjacent to the edge of the lid is separated from the outer wall face of the container body. There is a sealed container. The sealed container according to claim 1 or 2, wherein the lid and the container body are molded of plastic resin. The sealed container according to claim 1 or 2, wherein the close contact portion is heat-sealed by a laser welding method. The close contact portion is formed of a material absorbing laser light, or a coating material for absorbing the laser light is applied to the close contact portion, or the close contact portion absorbs the laser light. A sealed container, characterized in that an object made of a material is arranged. 8. The sealed container according to claim 7, wherein the lid and the container body are formed of polyethylene terephthalate resin. delete delete

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