JP2006298442A - Container and its sealing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container which surely keeps sealing properties of the content on the assumption that freezing is performed under a sealed condition, and in addition, can simply release a lid material from a container body, and also to provide its sealing method. <P>SOLUTION: A strongly welding part 2A, between the container body 20 and the lid material 30 having an adhesive force so that the content is not leaked, is formed on the inner peripheral side of the flange 24 of the container body 20 opposing to the inside of an opening tab 32 of the lid material 30, and a weakly welding part 3 between the container body and the lid material having an adhesive force weaker than that for the strongly welding part 2A is formed on the outer peripheral side of the strongly welding part 2A on the flange 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a frozen container and a sealing method thereof, and more particularly to a container that can be easily opened by pulling a tab of a lid and a sealing method thereof.

  Various types of containers having a container body having a flange around the opening and a lid member that is provided with an opening tab and that is heat-sealed to the flange of the container body have been conventionally known. ing.

  In such a container, in order to enclose the contents of the container with a good sealing property so as not to come into contact with the outside air, the lid material may be firmly heat-sealed to the flange of the container body. However, when the lid is firmly heat-sealed to the flange of the container body in this way, the lid remains in the container even if the lid tab is pulled to remove the lid from the container body in order to take out the contents from the container. There was a problem that it was difficult to peel from the main body.

  In such a case, if the tab of the lid member is forcibly pulled, the container main body may be deformed or the contents may be scattered around when the contents are liquid.

  In order to overcome such problems, even if the inner surface of the lid facing the flange of the container body is embossed and the lid is heat-sealed to the flange of the container body, no strong adhesive force is generated. (For example, refer to Patent Document 1).

JP 2000-355366 A

  However, in the container described in Patent Document 1 described above, since the adhesive force between the lid member and the flange of the container body is uniform over the entire circumference of the flange, the container can be easily separated from the flange of the container body. There was a risk of problems in the sealing performance of the contents.

  Accordingly, an object of the present invention is to provide a container that can reliably maintain the sealing performance of the contents on the premise of freezing in a sealed state, and can easily peel the lid member from the container body, and a sealing method thereof. It is said.

  In order to achieve the above-described object, the container according to the first aspect of the present invention is characterized in that a container main body having a flange around the opening and an opening tab projecting from the container main body. The container body having a lid material to be fused and the container body storing the contents and the lid material frozen in a sealed state, the flange of the container body facing the inside of the opening tab of the lid material Forming a strongly fused portion between the container main body and the lid material having an adhesive force that prevents the contents from leaking on the inner circumferential side of the flange, and the strong fused portion on the outer circumferential side from the strong fused portion in the flange That is, a weakly fused portion between the container main body and the lid member having a weaker adhesive force is formed.

  And since such a structure was employ | adopted, it will prevent peeling of a cover material with the adhesive force of the said strong melt | fusion part, and the sealing performance of the content will be ensured, and the adhesive force of the said weak melt | fusion part When the tab of the lid member is pulled, the lid member can be easily peeled off from the flange of the container body.

  The weakly fused portion may be formed by alternately connecting a plurality of linear fused portions and non-fused portions, or the plurality of dotted fused portions may be non-fused. It may be formed in a scattered manner in the part, or may be formed by a fusion part on the entire surface having a lower adhesive strength than the strong fusion part.

  The container sealing method of the present invention according to claim 5 is characterized in that a container main body having a flange around the opening and a lid member having an opening tab projecting and thermally fused to the flange of the container main body. The container main body containing the contents and the lid member are frozen in a sealed state, and the inner periphery of the flange of the container main body facing the inside of the opening tab of the lid member Forming a strongly fused portion between the container body and the lid member having an adhesive force that prevents the contents from leaking to the side, and an adhesive force from the strong fused portion to the outer peripheral side of the flange from the strong fused portion In order to form a weakly fused portion between the container main body and the lid member, the lid member is thermally melted to a flange of the container main body to form a sealed state, and the tab is pulled to form the weakly fused portion. So that the container body and the lid member are peeled from the part Sealing method for containers, characterized in that the.

  And, since such a configuration is adopted, as in the case of the container according to claim 1, the lid material is prevented from being peeled off by the adhesive force of the strongly fused portion, and the sealing performance of the contents is secured. When the tab of the lid is pulled by the adhesive force of the weakly fused portion, the lid can be easily peeled from the flange of the container body.

  The weakly fused portion may be formed by alternately connecting a plurality of linear fused portions and non-fused portions, or the plurality of dotted fused portions are in the non-fused portion. It may be formed in a scattered manner, or may be formed as a fusion portion of the entire surface having a weaker adhesive force than the strong fusion portion by making the pressing force at the time of the thermal melting weaker than other portions.

  According to the container and the container sealing method according to the present invention, the sealing performance of the contents can be reliably maintained, and the lid member can be easily peeled from the container body.

  1 to 7 show an embodiment of the container of the present invention. The container 1 according to the present embodiment is frozen after the contents are filled, and the container 1 has a resin container body 20. As shown in FIG. 1, the container body 20 has an inverted frustoconical cylindrical body 21, and a substantially planar bottom plate 22 is integrally formed at the lower end of the cylindrical body 21. ing. An opening 23 is formed at the upper end of the cylindrical body 21. The opening 23 of the cylindrical body 21 is integrally provided with a flange 24 that is located outside the cylindrical body 21 and is concentric with the cylindrical body 21.

  On the other hand, a lid 30 made of a heat-meltable resin that is heat-sealed to the flange 24 of the container body 20 is provided. As shown in detail in FIG. 2, the lid member 30 has a lid body 31 having an outer diameter substantially the same as the outer diameter of the flange 24, and is integrally projected on the outer periphery of the lid body 31. When the cage lid 30 is peeled off from the flange 24 of the container body 20, it is constituted by an opening tab 32 for picking with a finger.

  By the way, in this embodiment, the inner peripheral side of the flange 24 of the container main body 20 facing the inside of the opening tab 32 of the lid member 30 has an adhesive force sufficient to prevent the contents to be sealed later from leaking. A strongly fused portion 2 </ b> A between the container body 20 and the lid member 30 is formed. Further, in the flange 24 of the container main body 20, a weakly fused portion 3 between the container main body 20 and the lid member 30 having a lower adhesive strength than the strong fused portion 2 </ b> A is provided on the outer peripheral side of the strong fused portion 2 </ b> A. Is formed. The weakly fused portion 3 is in contact with the strongly fused portion 2A with a line segment 4 as shown in FIG. In addition, a strong fusion part 2B having the same adhesive force as that of the strong fusion part 2A is provided on almost the entire area of the flange 24 of the container body 20 at a portion not facing the inside of the opening tab 32 of the lid member 30. It is formed integrally with the strong fusion part 2A.

  As shown in FIG. 4, the weakly fused portion 3 and the strongly fused portion 2 </ b> A may be brought into contact with each other with an arc 5.

  In the present embodiment, the weakly fused portion 3 is formed by alternately connecting a plurality of line-shaped fused portions 6 and non-fused portions 7. As shown in FIG. 5, the non-fused portion 7 heats the lid member 30 by a seal head 9 with a built-in heater (not shown) in a state where the container body 20 is placed on the fixed mold 8. A plurality of recesses 11 that do not generate a pressing force may be formed on the contact surface 10 of the seal head 9 so as to correspond to the non-bonding portion 7 so that no pressing force is generated when pressing in the state and heat-sealing. That's fine.

  Details of the seal head 9 are shown in FIGS.

  FIG. 6 shows the shape of the contact surface 10 of the seal head 9 for forming the weakly fused portion 3 shown in FIG. 3. Each concave portion 11 is flat at the center in the alignment direction of the concave portions 11. It is formed to have a maximum length in the direction.

  FIG. 7 shows the shape of the contact surface 10 of the seal head 9 for forming the weakly fused portion 3 shown in FIG. 4, and each recess 11 has an equal length in the plane direction. ing.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  In order to form the container 1 of the present embodiment, the container main body 20 is filled with contents (not shown), the container main body 20 is placed on the stationary mold 8, and the lid member 30 is placed on the container main body 20. In this position, the lid body 30 covers the container body 20 containing the contents. Then, the seal head 9 heated by the heater is lowered from above the fixed mold 8, and the lid member 30 melted by heat is heat-sealed to the flange 24 of the container body 20. At this time, since a plurality of recesses 11 are formed in the seal head 9, the container body 20 and the outer peripheral side of the flange 24 of the container body 20 facing the inside of the opening tab 32 of the lid member 30 are The weak fusion part 3 with the lid | cover material 30 will be formed. In addition, strong fusion portions 2 </ b> A and 2 </ b> B between the container main body 20 and the lid member 30 are formed at other portions of the flange 24.

  By the way, even if the weak fusion part 3 is formed as described above, since the container 1 is frozen thereafter, the lid member 30 is peeled off from the container body 20 through the weak fusion part 3. There is no fear.

  And in order to peel such a lid | cover material 30 of the container 1 from the container main body 20, the opening tab 32 of the lid | cover material 30 is pinched with a finger, and it pulls so that the opening tab 32 may bend back. Then, since the weakly fused portion 3 between the container body 20 and the lid member 30 is first positioned inside the opening tab 32, the weakly fused portion 3 has a wide range of peeling at a time. Regardless, the lid member 30 in the weakly fused portion 3 can be easily peeled from the flange 24 of the container body 20. Then, the container body 20 and the lid member 30 are fused by the strong fusion portions 2A and 2B, but the lid member 30 is peeled from the container body 20 in the weak fusion portion 3 and the lid member 30 is peeled off. Therefore, the lid member 30 can be easily peeled off from the flange 24 of the container body 20 even in the strongly fused portions 2A and 2B.

  Thus, since the weakly fused part 3 is located inside the opening tab 32 of the lid member 30, the lid member 30 can be easily peeled from the container body 20. In addition, since strong fusion parts 2A and 2B exist around the entire circumference between the lid member 30 and the flange 24 of the container body 20, when the lid member 30 is not peeled off from the container body 20, this strong fusion is provided. The adhesive force of the attachment portions 2A and 2B can prevent the lid member 30 from being peeled off from the container body 20 and ensure the sealing performance of the contents.

80 ml of mandarin orange jelly solution heated to 65 ° C in a plastic cup (configuration: polyethylene 0.8 mm thickness) as a container body with an outer diameter of 70 mmφ, an inner diameter of 62 mmφ, a flange width of 4 mm, a height of 40 mm, and a bottom portion of an inner diameter of 55 mmφ Filled with (mandarin orange fruit juice 50%, water 31%, liquid sugar 17%, gelling agent 1.2%, citric acid 0.5%, flavor 0.3%), outer diameter 75mmφ (configuration: polyethylene / polyester When the lid material provided with a 10 mm-long opening tab in the radial direction of the lid body in the outer peripheral direction of the circular film as the lid body of the laminate film (70 μm) is heated and melted, the lid is pressurized and heated. As shown in FIG. 6, the shape of the contact surface of the seal head with the lid material for heat-bonding to the periphery of the opening tab is provided with a plurality of recesses where the lid material and the cup are not heat-bonded. Since the straight line (center line) connecting the portion corresponding to the center position in the width direction of the opening tab and the portion corresponding to the center position of the cup upper surface intersects with the portion corresponding to the inner peripheral position of the cup, it is perpendicular to the center line. A shape in which seven concave portions serving as non-crimped portions are formed in a linear shape with a width of 2 mm and a distance of 2 mm between a new straight line locus and a portion corresponding to the outer peripheral position of the cup at a position 1 mm outside from the straight line locus. The temperature of the seal head having a contact surface with the lid material is set to 170 ° C., the pressure applied to the seal head at the time of heat fusion is set to 3 kg / cm ² , and the contact time between the seal head and the cup is set to 1.5 seconds. And the lid material were heat-sealed.

  As Comparative Example 1, a heat seal was made in the same manner as in Example 1 using a normal seal head in which a non-crimped portion was not provided near the opening tab.

  And as a result of the opening test by 10 test subjects, Example 1 was able to open smoothly compared with the comparative example 1 without requiring the force like the comparative example 1 at the opening initial stage. In Example 1, the sealing surface of the sealing head is a solid solid type, but may be a mesh type having fine irregularities.

Example 1 in a paper cup (configuration: polyethylene 18 μ / paper cup base paper 220 g / m ² / polyethylene 37 μ) as a container body having an outer diameter of 70 mmφ, an inner diameter of 64 mmφ, a flange width of 3 mm, a height of 30 mm, and an inner diameter of 56 mmφ at the bottom. Filled with 70 ml of mandarin orange jelly solution heated to 65 ° C. used in the above, and the length of the lid body in the radial direction in the outer peripheral direction of the film as the lid body with an outer diameter of 75 mmφ (configuration: polyethylene / polyester laminate film 70 μ) FIG. 7 shows the shape of the contact surface of the seal head with the lid material for pressurizing and heating the lid material to the cup container when heat-sealing the lid material provided with a 10 mm opening tab. As shown, in the periphery of the opening tab, a portion corresponding to the center position of the opening tab and the center of the cup upper surface A center line in a range outside a trajectory of parallel lines at positions 15 mm apart from each other on the left and right with respect to a straight line (center line) connecting the corresponding portions, and a circular path concentric with the inner circumference of the cup and having a radius of 1 mm larger The temperature of the seal head having a contact surface with a lid member having a shape in which six recesses to be non-crimped portions are formed in a linear shape with a width of 2.5 mm and a spacing of 2.5 mm in parallel is 220 ° C. Was set to 3.5 kg / cm ² , the contact time between the seal head and the cup was set to 2 seconds, and the cup and the lid were heat-sealed.

  As Comparative Example 2, a heat seal was made in the same manner as in Example 2 using a normal seal head in which a non-crimped portion was not provided near the opening tab. As a result of conducting an opening test by 10 subjects, Example 2 was able to open smoothly compared to Comparative Example 2 without requiring the same force as Comparative Example 2 in the initial stage of opening.

  In the second embodiment, the sealing surface of the sealing head is a solid solid type, but may be a mesh type having fine irregularities.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

For example, in the above-described embodiment, the weakly fused portion is constituted by the fused portion and the non-fused portion. However, the weakly fused portion includes a plurality of point-like fused portions in the non-fused portion. You may comprise so that it may be scattered and formed. In this case, a large number of dot-like protrusions may be provided on the contact surface of the seal head.
Further, the weakly fused portion may be formed by a fused portion of the entire surface whose adhesive force is weaker than that of the strongly fused portion. In this case, the numerical value of at least one of the temperature and pressure of the seal head may be lowered as compared with both of the embodiments described above.

The disassembled perspective view which shows embodiment of the container which concerns on this invention Top view of the lid of FIG. Explanatory drawing which shows embodiment of the melt | fusion part in the container of FIG. Explanatory drawing which shows other embodiment of the melt | fusion part in the container of FIG. The schematic front view which shows embodiment of the apparatus for performing the heat sealing | fusion of the cover material and container main body in the container of FIG. The bottom view which shows the structure of the seal head for forming the melt | fusion part of FIG. The bottom view which shows the structure of the seal head for forming the melt | fusion part of FIG.

Explanation of symbols

1 container 2A, 2B strong fusion part
DESCRIPTION OF SYMBOLS 3 Welding part 6 Fusion part 7 Non-fusion part 8 Fixed type 9 Seal head 20 Container main body 21 Cylindrical trunk part 22 Bottom plate 23 Opening part 24 Flange 30 Lid material 31 Lid material main body 32 Opening tab

Claims (8)

A container body having a flange around the opening; and a lid member projecting an opening tab and heat-sealed to the flange of the container body; In a container in which the lid is frozen in a sealed state,
Forming a strongly fused portion between the container body and the lid material having an adhesive force that prevents the contents from leaking on the inner peripheral side of the flange of the container body facing the inside of the opening tab of the lid material; A container, characterized in that a weakly fused portion between the container body and the lid member having a lower adhesive strength than the strong fused portion is formed on the outer peripheral side of the strong fused portion in the flange.   The container according to claim 1, wherein the weakly fused portion is formed by alternately connecting a plurality of linear fused portions and non-fused portions.   2. The container according to claim 1, wherein the weakly fused portion is formed such that a plurality of dotted fused portions are scattered in the non-fused portion.   2. The container according to claim 1, wherein the weakly fused portion is formed by a fused portion of an entire surface whose adhesive strength is weaker than that of the strongly fused portion. A container body having a flange around the opening; and a lid member having an opening tab protruding from the container body and thermally melted on the flange of the container body. In the sealing method of the container in which the material is frozen in a sealed state,
Forming a strongly fused portion between the container body and the lid material having an adhesive force that prevents the contents from leaking on the inner peripheral side of the flange of the container body facing the inside of the opening tab of the lid material; In the flange, the lid member is formed on the flange of the container body so as to form a weakly fused portion between the container body and the lid member having a lower adhesive strength than the strong fused portion on the outer peripheral side of the strong fused portion. A container sealing method characterized by forming a sealed state by heat melting, and pulling the tab so that the container main body and the lid member are peeled from the weakly fused portion.   6. The container sealing method according to claim 5, wherein the weakly fused portion is formed by alternately connecting a plurality of linear fused portions and non-fused portions.   6. The container sealing method according to claim 5, wherein the weakly fused portion is formed by interspersing a plurality of dotted fused portions in the non-fused portion.   The weakly fused portion is formed as a fused portion of the entire surface whose adhesive force is weaker than that of the strong fused portion by making the pressing force at the time of the thermal melting weaker than other portions. 6. The container sealing method according to 5.

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