US20020179607A1 - Packaging container, packaging body including the same, and packaging method - Google Patents

Packaging container, packaging body including the same, and packaging method Download PDF

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Publication number
US20020179607A1
US20020179607A1 US09/979,073 US97907301A US2002179607A1 US 20020179607 A1 US20020179607 A1 US 20020179607A1 US 97907301 A US97907301 A US 97907301A US 2002179607 A1 US2002179607 A1 US 2002179607A1
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US
United States
Prior art keywords
flange
film
slanted
packaging
tray
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/979,073
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English (en)
Inventor
Yoshio Iwasaki
Minoru Ohshita
Toshio Oguri
Norio Kawanishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ishida Co Ltd
Original Assignee
Ishida Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2000346183A external-priority patent/JP2001348020A/ja
Priority claimed from JP2001036065A external-priority patent/JP2001348003A/ja
Application filed by Ishida Co Ltd filed Critical Ishida Co Ltd
Assigned to ISHIDA CO., LTD. reassignment ISHIDA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWASAKI, YOSHIO, KAWANISHI, NORIO, OGURI, TOSHIO, OHSHITA, MINORU
Publication of US20020179607A1 publication Critical patent/US20020179607A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/34—Trays or like shallow containers

Definitions

  • the present invention relates to a packaging container, a packaging body including the same, and a packaging method. More particularly, the present invention relates to a packaging container for packaging an article to be packaged by bonding a film to a flange, a packaging body including the same, and a packaging method.
  • both of the aforementioned methods have problems.
  • the entire packaging container is covered in a film and the film is overlapped and thermally welded to itself at the bottom of the container. Consequently, the interface between the container body and the film is merely a state of physical contact and, if the contents are liquid, there is the risk that the liquid will leak if the container is tilted.
  • the overlap method provides inferior sealing performance.
  • large amounts of film are used because the film must be several times larger than the planar size of the container; this is disadvantageous from the standpoint of trash disposal and reducing the consumption of resources.
  • the mold fixed seal method requires a thermo-compression bonding mold for each container. Since this method lacks flexibility to accommodate different sizes and shapes of container, it is seldom used in industries requiring many types of packaging container.
  • the object of the present invention is to provide a packaging container, a packaging body including the same, and a packaging method, in which sufficient bonding strength can be obtained when a packaging container and a film are thermally bonded using a heat roller slanted at a prescribed angle.
  • the packaging container of claim 1 is provided with a bottom panel, a wall panel, and a flange.
  • the bottom panel is a panel for placing an article to be packaged.
  • the wall panel extends upward from the bottom panel in such a manner that it surrounds the bottom panel.
  • the flange extends outward from the upper end part of the wall panel.
  • the flange has a curved part on its wall panel side and a slanted part positioned to the outside of the curved part.
  • the cross section of the upper surface of the slanted part is substantially a straight line and the curved part is formed such that the wall panel and the slanted part have an uninterrupted shape.
  • the flange on a conventional packaging container has a planar shape oriented in a horizontal plane or a curled curve shape, and linear contact results when the heated roller (hot body) is made to contact the flange in a slanted condition. Therefore, the packaging container and the film covering the upper surface of the packaging container are bonded together in a linear seal-like state. Consequently, the film is easily ripped or peeled due to the transport and physical shock of the distribution process and it is highly possible that the stored article will be exposed. Also, leakage will occur if the packaged article is a liquid. Since the bonding is linear, the line-sealed bond section sometimes develops pinholes and the like due to friction when the hot body moves, resulting in the loss of sealing performance.
  • the packaging container of this claim has a flange provided with a slant that is roughly aligned with the angle at which the hot body makes contact. Also, since the upper surface of the slanted part of the flange is a straight line (the cross section of the upper surface is a straight line), the seat formed between the packaging container and the film when the slanted hot body touches the flange is a planar seal rather than a linear seal and a stronger bond with improved sealing performance is obtained. It is acceptable if the straight line of the slanted part of the flange mentioned here is substantially straight. That is, it is acceptable if there is a slight curve because the pressure resulting when the hot body is pressed against the flange will cause the contact surface of the flange to become a straight line, making a planar bond possible.
  • This air layer insulates the heat provided by the hot body during sealing and the heat from the hot body is concentrated on the film, thus applying a large thermal stress. With the thermal resistance of the films normally used in packaging, this phenomenon causes pinholes to develop.
  • the packaging container of this claim has a curved part formed on the inside of the slanted part (seal portion) of the flange so that the film makes close contact with the curved part.
  • the heat from the hot body thermally bonds the film to the slanted part and also is conducted through the curved part of the flange and radiated away.
  • the film is put into close contact with the flange of the packaging container and, in order to maintain the close contact, the film is pulled by the apparatus and held in a state of tension. It is also better if the surfaces of the slanted part and curved part of the flange of the packaging container have enough contact surface area for the film to bond sufficiently thereto. That is, it is better to have planar contact and not point contact (in order to secure a sufficient static coefficient of friction) and it is better if the surface is smooth. In general, if the surface has a luster, sufficient close contact can be achieved between the film and the packaging container.
  • the present invention holds the film in a state of tension and simultaneously seals with a hot body, it is best if the flange surface is smooth in order to prevent the tension from acting directly on the seal part immediately after sealing and also in order to reduce the center-directed film tension caused by frictional forces at the surface of the flange so that the risk of bad sealing occurring because of film tension immediately after sealing can be reduced as much as possible.
  • the packaging container of claim 2 is a packaging container as recited in claim 1, wherein the slanted part is at a slant angle in the range from 20 to 60 degrees with respect to the bottom panel.
  • the packaging container of claim 3 is a packaging container as recited in claim 1 or claim 2, wherein the width of the slanted part is 2 mm or greater.
  • the packaging container of claim 4 is a packaging container as recited in any one of claims 1 to 3, wherein a bonding agent is applied to the surface of the flange.
  • the packaging body of claim 5 is equipped with a packaging container as recited in any one of claims 1 to 4 and a film.
  • the film covers the upper surface of the packaging container and its periphery is bonded to the flange.
  • the packaging body of claim 6 is a packaging body as recited in claim 5, wherein the periphery of the film follows the curved part of the flange without any air gaps and is bonded to the slanted part of the flange.
  • the packaging body of claim 7 is a packaging body as recited in claim 5 or 6, wherein the flange further has a protruding part.
  • the protruding part is positioned on the outer perimeter of the slanted part and aids in the thermal cutting of the film.
  • the packaging body of claim 8 is a packaging body as recited in any one of claims 5 to 7, wherein the film is thermally bonded to the flange by pressing a slanted hot body against the slanted part while the periphery of the film is in close contact with the curved part and the slanted part.
  • the packaging method of claim 9 is provided with a first step, a second step, a third step, and a fourth step.
  • first step an article to be packaged is placed in a packaging container having a slanted flange at its periphery.
  • second step a film is supplied above the packaging container and tension is applied to the film.
  • third step the packaging container is raised and the flange is made to touch against the tensioned film.
  • fourth step a hot body is pressed against the flange (against which the film is touching) at a slant angle larger than the slant angle of the flange.
  • the hot body presses against the slanted flange of the packaging container at a slant angle that is larger than the slant angle of the flange. Since a typical packaging container is elastic, the pressure of the hot body causes the flange to deform so as to align with the hot body and, when the hot body touches the flange, a planar seal—not a linear seal—is formed between the packaging container and the film. As a result, a strong bond with a high sealing performance is obtained.
  • the thermal cutting performance will decline if the difference between the slant angle of the flange and the slant angle of the hot body is too small, and it is difficult to obtain a planar seal if the same difference is to large. Therefore, it is preferable to set this difference to a value that is appropriate for both the cutting performance and achieving a planar seal.
  • the packaging method of claim 10 is a packaging method as recited in claim 9, wherein in step 4 the hot body is pressed against the flange such that the width of the portion where the flange and the hot body contact each other is 2 mm or greater.
  • FIG. 1 is a cross sectional view of the tray raw material in the first embodiment.
  • FIG. 2 is a cross sectional view of the tray in the first embodiment.
  • FIG. 3 is a schematic view of the packaging apparatus in the first embodiment.
  • FIG. 4 is a view for explaining the packaging operation of the first embodiment.
  • FIG. 5 is a view for explaining the packaging operation of the first embodiment.
  • FIG. 6 is a plan view of the tray, stretch film, and heat rollers in the first embodiment before packaging.
  • FIG. 7 is a plan view showing the seal operation of the heat rollers in the first embodiment.
  • FIG. 8 illustrates the close contact of the stretch film Fm with respect to the flange 13 in the first embodiment before sealing.
  • FIG. 9 illustrates the condition of the heat roller, tray, and stretch film in the first embodiment during sealing and thermal cutting.
  • FIG. 10 illustrates the condition of the stretch film during the sealing operation for a conventional tray and for a tray in accordance with the first embodiment.
  • FIG. 11 illustrates the condition of the heat roller, tray, and stretch film of the third embodiment during sealing and thermal cutting.
  • FIG. 12 illustrates the condition of the heat roller, tray, and stretch film of the fourth embodiment during sealing and thermal cutting.
  • FIG. 1 shows a cross sectional view of the raw material of the tray (packaging container) that embodies the present invention.
  • This raw material is a plastic sheet.
  • This plastic sheet 90 is formed into a tray by pressure and vacuum forming.
  • the plastic sheet 90 shown in FIG. 1 comprises thermally meltable plastic material layers 91 , 93 joined to a foamed plastic material layer 92 .
  • Thermally meltable plastic material layer 91 which serves as the upper surface of the tray, is thermally bonded to a stretch film by a hot body (heat roller 3 , discussed later) and must be made of a material that can be thermally bonded to the stretch film.
  • the stretch film has a three-layer structure comprising ethylene vinyl acetate copolymer, polypropylene “Catalloy (Montell Polyolefins)”, and ethylene vinyl acetate copolymer, respectively. Therefore, a material having similar qualities to that of the stretch film is used for the thermally meltable plastic material layer 91 . More specifically, ethylene vinyl acetate copolymer, polypropylene, or polyethylene is used as the thermally meltable plastic material layer.
  • Polystyrene, polypropylene, or other foamed body is used for the foamed plastic material layer 92 .
  • plastic material layer 93 which serves as the outer surface of the tray, a material having roughly the same heat shrinkage rate as plastic material layer 91 is used. Thus, deformation of the tray after forming is suppressed because the raw material is a material with plastic material layers 91 , 93 having similar shrinkage rates joined to both surfaces.
  • a multiple layer structure that includes at least one layer of a film made of ethylene vinyl alcohol copolymer, polyvinyl alcohol, or the like.
  • a multiple layer structure that includes at least one layer of a film made of a polyester (polyethylene terephthalate, polyethylene naphthalate, or the like). Materials and the thickness thereof should be selected based on the gas for which the material is to serve as a barrier. It is also possible to add a gas barrier property by depositing aluminum or a ceramic by vapor deposition.
  • Aluninum foil, iron foil, or other metal can also be used as a barrier layer; in the case of the tray, such a layer can be used for a layer other than the innermost layer, which is the bonding layer.
  • a metal barrier layer is used in a stretch film, the transparency will be hindered and there will be situations where the film is difficult to use.
  • a tray 10 is formed into the cross sectional shape shown in FIG. 2.
  • tray 10 comprises a rectangular bottom panel 11 , four wall panels 12 , and a flange 13 .
  • the four wall panels 12 extend upward from the four sides of bottom panel such that they surround the bottom panel.
  • Flange 13 is the portion that extends outward from the upper end part of wall panels 12 .
  • Flange 13 comprises a curved part 13 a on the wall panel 12 side and a slanted part 13 b positioned on the outside of curved part 13 a.
  • Curved part 13 a is formed such that wall panel 12 and slanted part 13 b blend with an uninterrupted shape.
  • the radius of curvature of curved part 13 a is in the range from R 2 (radius 2 mm) to R 10 and preferably in the range from R 3 to R 8 .
  • the cross section of the upper surface of slanted part 13 b is substantially a straight line and extends in a slanted direction from the outside edge of curved part 13 a.
  • the slant angle ⁇ (see FIG. 2) between the slanted part 13 b and the bottom panel 11 is set to an angle in the range from 20 to 60 degrees so that the heat rollers (hot bodies) 3 (discussed later) achieve planar contact when they contact the slanted part of the flange.
  • slant angles a can be between 5 and 90 degrees, the range from 20 to 60 degrees is preferred in view of the slant of the heat rollers 3 and other factors.
  • the slant angle of heat rollers 3 it is not necessary for the slant angle of heat rollers 3 to be identical to the slant angle a of slanted part 13 b of flange 13 . In fact, it is preferable to set the slant angle ⁇ of slanted part 13 b and the slant angle of heat rollers 3 such that these angles are only roughly aligned when heat rollers 3 are pressed against the flange during sealing.
  • Flange 13 is provided with width dimension D (see FIG. 2) in order to secure a prescribed seal width.
  • Width dimension D of flange 13 is assumed to be in the range from 1 to 15 mm and preferably in the range from 3 to 10 mm. It is also preferred that the width dimension of slanted part 13 b of flange 13 be 2 mm or greater.
  • the packaging apparatus 1 is the same as the packaging apparatus disclosed in Japanese Patent Application H11-137025.
  • tray 10 is placed on holding member 2 and then stretch film Fm is fed from delivery section 51 of film feeding mechanism 5 .
  • the fed stretch film Fm is held between two belts B that traverse transport rollers 52 a, 52 b and two belts B that traverse presser rollers 52 c, 52 d; these belts are moved in a direction perpendicular to the transport direction (horizontal direction in FIG. 6) so that the stretch film Fm is stretched in the widthwise direction (vertical direction in FIG. 6).
  • tension is generated in the stretch film Fm in the widthwise direction.
  • moving section 63 of lift mechanism 6 rises, pushes tray 10 up against the stretch film Fm, and stops (see FIG. 4).
  • the upward pushing of tray 10 produces tension in the stretch film Fm in the transport direction.
  • the stretch film Fm is in close contact with the slanted part 13 b and outside portion of the curved part 13 a of flange 13 of tray 10 .
  • motor 82 rotates shaft 81 through a prescribed angle, thus causing heat rollers 3 to rotate as shown in FIG. 7.
  • Heat rollers 3 move along the periphery (flange 13 ) of tray 10 and thermally weld stretch film Fm to tray 10 , thus forming a seal.
  • heat rollers 3 roll along flange 13 as they move.
  • FIG. 9 shows an enlarged view of the contact area between heat rollers 3 and tray 10 when the former move along the periphery of the latter.
  • the upper opening of tray T is covered by stretch film Fm, which is tensioned in both the lengthwise and widthwise directions, and stretch film Fm is pressed firmly against slanted part 13 b and the outside portion of curved part 13 a of flange 13 of tray 10 .
  • Heat rollers 3 touch diagonally against the portion where stretch film Fm contacts flange 13 and apply both heat and pressure. This heat and pressure cause stretch film Fm and flange 13 to fuse together thermally.
  • stretch film Fm melts and is cut away at the edge portion (which is, in this case, the outside edge part of slanted part 13 b of flange 13 where heat rollers 3 are touching) of tray 10 because the heat and pressure are concentrated on stretch film Fm and stretch film Fm is in tension at the edge portion of tray 10 (see FIG. 9).
  • the angle of the heat rollers 3 with respect to the horizontal plane is set to be slightly larger than the angle of the slanted part 13 b of flange 13 , as shown in FIG. 8. As shown in FIG.
  • FIG. 10 shows a case where a stretch film Fm is sealed to a conventional tray 100 and a case where a stretch film Fm is sealed to a tray 10 in accordance with the embodiment.
  • FIG. 10( a ) is an expanded view of the vicinity of the flange 113 when heat rollers 3 thermally weld stretch film Fm to conventional tray 100 .
  • Flange 113 of tray 100 comprises a first curved part 113 a, a horizontal part 113 b, a second curved part 113 c, and a vertical part 113 d.
  • the contact of heat roller 3 with second curved part 113 c of flange 113 causes stretch film Fm to be sealed to tray 100 .
  • An air layer S 1 is formed between flange 113 and stretch film Fm in the space to the outside of vertical part 113 d near second curved part 113 c. Because air layer S 1 serves as thermal insulation, the heat from heat rollers 3 concentrates on the stretch film Fm at the boundary line between second curved part 113 c and vertical part 113 d and the stretch film Fm is thermally cut.
  • Air layer S 2 tends to form in a similar manner between stretch film Fm and the horizontal part 113 b of flange 113 .
  • Air layer S 2 serves as thermal insulation with respect to the heat from heat rollers 3 and causes a high risk of pinholes developing on the inside of the seal portion due to heat. If such pinholes develop, the inside of tray 100 cannot be kept in a sealed state. Furthermore, if the pinholes are large, the packaging itself cannot be accomplished.
  • FIG. 10( b ) illustrates thermal sealing of a stretch film Fm to a tray 10 in accordance with this embodiment. Since tray 10 has slanted part 13 b disposed to the outside of curved part 13 a, stretch film Fm makes close contact with slanted part 13 b and the outside portion of curved part 13 a of flange 13 when stretch film Fm covers curved part 13 a. Heat rollers 3 touch chiefly against slanted part 13 b and hardly touch curved part 13 a at all. Therefore, the air layers S 1 , S 2 shown in FIG. 10( a ) do not form and stable sealing is accomplished without the development of pinholes.
  • CCP polypropylene films
  • a foamed polystyrene sheet (thickness 1.5 mm, weight 260 g/m 2 ) was used for the base material sandwiched between the surface layers. Both materials were formed by coextrusion into a sheet comprising three layers made of CCP (40 ⁇ m), foamed polystyrene (1.5 mm), and CPP (40 ⁇ m), respectively. The sheet was then set into a mold and made into food tray 10 using a vacuum pressure forming machine.
  • the dimensions of the tray were as follows: external dimensions 130 mm ⁇ 180 mm, depth 30 mm, flange angle ⁇ 35 degrees, flange width 5 mm, and radius of curvature of curved part 5 mm (R5).
  • Tray 10 was placed in a heat roller type stretch film packaging apparatus like that described previously and a stretch film Fm was heat sealed to the opening of the tray.
  • a stretch film Fm having a thickness of 15 ⁇ m and three layers made of the following materials, respectively, was used: linear low-density polyethylene (LLDPE), polypropylene “Catalloy”, and linear low-density polyethylene (LLDPE).
  • the sealing temperature was set to 190° C.
  • Tray 100 of the comparative example used the same material as was used for tray 10 and was given similar dimensions and a flange 113 shaped like that shown in FIG. 10( a ).
  • tray 10 (the operative example of the present invention) had a stable seal strength of at least 500 gf/15 mm.
  • flange 13 of tray 10 is formed with a slanted part 13 b that has a slant angle corresponding to the slant angle of beat rollers 3 and a curved part 13 a that allows stretch film Fm stay in contact with the surface of tray 10 (i.e., surface of curved part 13 a ) up to the place in the inward direction of the tray where heat rollers 3 no longer touch, the heat from heat rollers 3 never concentrates on the stretch film Fm only and is always transmitted to tray 10 as well. Thus, the thermal stress on stretch film Fm is reduced and the development of pinholes is suppressed.
  • the tray was made by vacuum pressure forming a 0.8-mm thick polypropylene sheet.
  • the tray dimensions were as follows: external dimensions 140 mm ⁇ 210 mm, depth 25 mm, flange angle ⁇ 35 degrees, and flange width 10 mm.
  • the tray was placed in the heat roller type stretch film packaging machine and the stretch film was heat sealed to the tray.
  • the stretch film used for the sealing had a thickness of 15 ⁇ m and a three-layer structure comprising layers made of ethylene vinyl acetate copolymer, polypropylene “Catalloy”, and ethylene vinyl acetate copolymer, respectively.
  • the measurement results indicate that a completely secure bond was obtained.
  • the number of samples N was 10 (i.e., there were 10 test trays) and the measurement results showed that the strength was at least 500 gf/15 mmn for all samples. It was also observed that no pinholes developed.
  • the flange comprises a slanted part whose slant angle is roughly aligned with the slant angle of the heat rollers and a curved part that enables something other than an air layer, e.g., the tray itself or a bonding agent, to exist in addition to the stretch film in the vicinity of the heat rollers.
  • an air layer e.g., the tray itself or a bonding agent
  • the stretch film Fm was thermally cut by concentrating heat and force on the stretch film Fm at the outer edge part of slanted part 13 b of flange 13 . It is also acceptable to shape the flange 13 as shown in FIG. 11 in order to apply more pressure and cut the film more reliably.
  • a protruding part 13 c is formed on the outer perimeter of slanted part 13 b. Protruding part 13 c protrudes toward heat rollers 3 and serves in the thermal cutting of stretch film Fm. The tip of protruding part 13 c is pointed so that high pressure acts on the stretch film Fm where it is pinched between protruding part 13 c and heat rollers 3 . As a result, stretch film Fm is reliably cut at this portion.
  • a foamed hot melt type bonding agent as the bonding agent.
  • the heat supplied from the heat rollers is radiated into the air and the thermal efficiency declines. If a foamed hot melt type bonding agent is applied to the flange, the foamed boding agent will absorb the heat from the heat rollers and melt, thus serving its function as a bonding agent.
  • FIG. 2 shows a case where the slant angle of the heat roller 3 is roughly the same as the slant angle ⁇ of the slanted part 13 b of flange 13 .
  • the slant angle ⁇ of heat roller 3 is slightly larger than the slant angle ⁇ of flange slanted part 13 b of tray 10 .
  • FIG. 12 illustrates stretch film Fm being tensioned and set on the upper surface of tray 10 and then sealing being conducted by heat roller 3 .
  • heat roller 3 has a slant angle, that is slightly larger than the slant angle a of slanted part 13 b of flange 13 .
  • flange 13 After seat sealing is completed and heat rollers 3 move away from flange 13 , flange 13 returns from its elastically deformed state to its original slant angle as shown in FIG. 12 ( c ). At this stage, there exists on the outside portion of curved part 13 a of flange 13 a section of length r (see FIG. 12 ( c )) that is not thermally bonded to the flange but is in close contact with stretch film Fm. This section of length r maintains the tension of the stretch film Fm covering tray 10 and reduces the load on the inside end face of heat sealed section d, thus serving to prevent poor sealing.
  • the seal portion will reach the inside edge part of the portion where stretch film Fm is in close contact with flange 13 and be directly heated by heat rollers 3 . Therefore, the tension in stretch film Fm will act directly on the portion of stretch film Fm at the inside end face of the seal portion, i.e., a portion of stretch film Fm that has been bonded but has not completely cooled. Before stretch film Fm hardens, the portion of stretch film Fm at the inside end face of the seal portion (i.e., the inside edge part of the closely contacting portion) will develop such defects as tears or pinholes.
  • this embodiment suppresses the development of such defects as tears or pinholes in stretch film Fm because the slant angle ⁇ of heat rollers 3 is set such that, during sealing, the area to the outside of the vertical centerline of curved part 13 a of flange 13 is sealed and the area to the inside is not sealed.
  • Tray 10 is made by molding a sheet into a specified shape using vacuum air-pressure forming and then cutting off the edges to obtain a specified flange dimension.
  • a mold is set on the outside of tray 10 and the outside dimensions can be molded accurately.
  • the inside dimensions are quite difficult to mold accurately and precisely.
  • slant angle error occurs during molding and cutting error occurs during cutting of the edges.
  • the hot body is pressed against the slanted flange of the packaging container at a slant angle that is slightly larger than the slant angle of the flange.
  • the deformation of the flange allows a planar seal to be made between the packaging container and the film.
  • the pressure applied at the outside edge part of the seal portion is larger than the pressure in other sections and the film can be thermally cut easily at the outside edge part of the seal portion. Since there is almost no bonding of the stretch film at the apex of the flange, such trouble as holes developing in the film is suppressed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Package Closures (AREA)
  • Closing Of Containers (AREA)
  • Packages (AREA)
  • Basic Packing Technique (AREA)
  • Cartons (AREA)
US09/979,073 2000-04-06 2001-03-19 Packaging container, packaging body including the same, and packaging method Abandoned US20020179607A1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2000104433 2000-04-06
JP2000104433 2000-04-06
JP2000346183 2000-11-14
JP2000346183A JP2001348020A (ja) 2000-04-06 2000-11-14 包装容器、及びそれを含む包装体
JP2001036065 2001-02-13
JP2001036065A JP2001348003A (ja) 2000-04-06 2001-02-13 包装容器の包装方法

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US20020179607A1 true US20020179607A1 (en) 2002-12-05

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US (1) US20020179607A1 (fr)
EP (1) EP1193179A4 (fr)
KR (1) KR20020025059A (fr)
CN (1) CN1366504A (fr)
AU (1) AU757599B2 (fr)
NZ (1) NZ515790A (fr)
TW (1) TW534890B (fr)
WO (1) WO2001076955A1 (fr)

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US9056704B2 (en) 2009-03-16 2015-06-16 1/4 Vin Wine glass, method for packaging wine, and wine container
US20160214752A1 (en) * 2015-01-22 2016-07-28 Ishida Co., Ltd. Packaging apparatus
WO2018150361A1 (fr) * 2017-02-16 2018-08-23 Alto Packaging Limited Améliorations apportées à des plateaux

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JP5122789B2 (ja) * 2006-10-27 2013-01-16 東洋製罐株式会社 角形絞り容器およびその成形方法
ITBO20070391A1 (it) * 2007-06-01 2008-12-02 Coopbox Europ Spa Foglia di materia plastica, vassoio per un prodotto alimentare ottenuto da detta foglia, confezione comprendente detto vassoio e relativo metodo di realizzazione.
MX2010013865A (es) * 2008-06-17 2011-02-15 Cryovac Inc Charola termoplastica.
NL2001739C2 (nl) * 2008-07-01 2010-01-05 Ch Food B V Werkwijze voor het afdekken van een houder, en verpakking.
KR101690343B1 (ko) * 2009-01-06 2016-12-27 이데미쓰 유니테크 가부시키가이샤 용기 본체, 포장 용기, 용기 본체의 제조 방법 및 제조 장치
CN102009772B (zh) * 2009-09-08 2014-09-10 出光统一科技株式会社 包装容器、其制造方法以及制造装置
CN106628616B (zh) * 2017-01-22 2020-12-25 罗松 一种发泡聚乙烯材质的包装容器
KR102309363B1 (ko) * 2017-02-28 2021-10-07 컨버터 매뉴팩처링, 엘엘씨 매끄러운 연부 및, 임의적으로, 박리 가능한 표면을 가지는 형성된 열가소성 물품

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US9056704B2 (en) 2009-03-16 2015-06-16 1/4 Vin Wine glass, method for packaging wine, and wine container
US20160214752A1 (en) * 2015-01-22 2016-07-28 Ishida Co., Ltd. Packaging apparatus
US10035613B2 (en) * 2015-01-22 2018-07-31 Ishida Co., Ltd. Packaging apparatus
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KR20020025059A (ko) 2002-04-03
TW534890B (en) 2003-06-01
AU757599B2 (en) 2003-02-27
EP1193179A1 (fr) 2002-04-03
CN1366504A (zh) 2002-08-28
NZ515790A (en) 2003-09-26

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