JPH0214120A - Manufacture of container - Google Patents

Abstract

PURPOSE:To open a sealed container easily, save the processes and enhance productivity by melt sealing a cover to a flange section by means of a seal component and forming a weakening line before or simultaneously with said melt sealing. CONSTITUTION:A container main body 10 is formed almost in a cup shape with a flange section 13 at its top, and a skirt section 14 as a curved and folded section toward the bottom section side is formed on an outer peripheral edge 13B except an opening section 13A. A cover 15 is melt sealed on the whole periphery of the flange section 13 except a knob 15A. Said melt seal is constituted of a belt-shaped section 16 and a linear seal section 17 formed almost in the center of said belt seal section. A cut line 18 as a weakening line is formed along the outer edge 15A of the cover 15 on an inner layer section 11 of the flange 13, while a notch 19 is formed on the inner side away from the belt- shaped section 16 by the dimension T. When the seal of the cover 15 is opened, the inner layer section 11 and an outer layer section 12 can be peeled off from the cut line 18 to the notch 19 and the seal of the container is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a container in which a lid material is melt-sealed to a multilayered container body having a flange portion.

[Conventional technology]

BACKGROUND ART Conventionally, containers have been widely used for packaging foods, which include a container body having a flange portion and a lid material, and the flange portion and the lid material are melt-sealed.

In order to achieve both easy-opening and sealing properties, this container has a multilayered container body with an interlayer adhesion force smaller than the adhesion force between the flange and the lid, and a non-stick adhesive inside the sealing part. Some containers have a sealed portion and a notch in the non-sealed portion, so that when the container is opened, the container body is peeled off from the outer edge to the notch. Furthermore, some of these containers have ribs, skirts, curls, etc. on the flange to improve rigidity.In order to improve ease of opening, this type of container has cutting lines on the outer edge of the seal. A line of weakness is formed, and the glabella peeling of the container body starts from this line of weakness.

However, when a cutting line is formed in advance on the flange portion, it is difficult to accurately position the container with respect to the cutting line and melt-seal the container, and if the seal is even slightly misaligned, it becomes difficult to open the container.

In order to solve this problem, the following techniques have been conventionally known. That is, as a conventional example, there is a conventional example 1) in JP-A-63-96060, in which the rib of the opening part is cut and the outer edge of the seal on the flange part and the cut surface are aligned. When melt-sealing the flange and the lid with a sealing member, the edge of the sealing member forms a line of weakness in the inner layer of the container body, and when the container is opened, peeling starts from this line of weakness (conventional method). There is a conventional example (2) in which a film is melt-sealed to the container body and then a lid material is cut from this film (conventional example (2)).

[Problem that the invention seeks to solve]

However, in the above-mentioned technique I, (1) the ribs formed on the flange are cut, which reduces the rigidity and strength of the cut portion, reducing the functionality of the ribbed container; Since the outer edges of the seals are aligned, there is a problem in that the seal width cannot be set arbitrarily. Also,
In conventional example ①, if the lid material is aluminum foil, the lid material will break, and ∎ In order to form a line of weakness in the inner layer of the container body, the resin of the inner layer must be stronger than the resin of the lid material. weak,
In addition, the melting point must be low, and there is the problem that the inner layer cannot be made thickly.Furthermore, the line of weakness cannot be reliably formed, so sufficient delamination cannot be achieved and easy opening cannot be ensured. Furthermore, in Conventional Example (2), it is necessary to punch out the film from the lid material along the cutting line, which makes positioning difficult and has the problem of poor productivity.

Here, the object of the present invention is to easily open the package, and to
An object of the present invention is to provide a method for manufacturing containers that can improve productivity.

[Means for solving problems]

The present invention is a method for producing a container, in which a container body having a flange portion is formed including an inner layer portion facing the inside of the main body and an outer layer portion that is peelably superposed on the inner layer portion, and a lid material is melted and rolled onto the flange portion. Then, a lid material is punched out from the film using a sealing member and a cutting member arranged so as to surround the sealing member, and the punched lid material is melt-sealed to the flange portion by the sealing member, and before or after this melt-sealing. At the same time, lines of weakness such as cutting lines are formed. That is, for example, a cutting member forms a line of weakness such as a cutting line on the flange, then the sealing member and the cutting member punch out the accumulated material from the film, and the punched lid material is placed so that its outer edge is along the weakened line. or melt-sealed to
At the same time, the seal member punches out the lid from the film and seals it to the flange portion by melting the seal member, and at the same time, the seal member forms a line of weakness.

Here, examples of melt sealing means include heat sealing, ultrasonic sealing, and the like.

[Effect]

In the present invention configured in this way, the flange portion is not canted as in the conventional example, so the rigidity of the container can be ensured.Furthermore, since the cutting member is arranged to surround the sealing member, the melt sealing Ensure that the outer edge and the weakened cotton match. Therefore, when the lid material is pulled from its edge toward the center of the container, the flange portion begins to peel off from the line of weakness that coincides with the outer edge of the melt seal.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. Here, in each embodiment, the same or similar constituent parts are given the same reference numerals, and the explanation will be omitted or simplified.

First, the container manufactured in the first embodiment will be explained based on FIGS. 4 and 5.

The container body 10 is formed into a substantially cup shape with a flange portion 13 at the top, and this flange portion 13 has a flat or partially convex opening 13A, and an outer peripheral edge 13B excluding the opening 13A has a bottom portion. A skirt portion 14 is formed as a bent portion toward the side. A lid material 15 is melt-sealed to the flange portion 13, and this lid material 15
is melt-sealed over its entire circumference except for the knob 15A protruding from the opening 13A. This melted seal consists of the band-shaped seal portion 16 and this band-shaped seal portion! 6, and a linear seal portion 17 formed approximately at the center of the tube. The band-shaped seal portion 16 is formed up to the outer edge 15A of the lid member 15.

Further, the container body 10 has a multilayer structure including at least two layers: an inner layer part (first layer part) 11 facing the inside of the main body, and an outer layer part 12 (second layer part) that is peelably polymerized on this inner layer part 11. It is said to be a structure. These inner layer portion 11 and outer layer portion 12
The glabellar peel strength is 300 to 2000 g/15, preferably 400 to 1500 g/15, but it is required that the sealing strength is at least smaller than the sealing strength of the flange portion 13 and the lid member 15.

The inner layer portion 11 of the flange portion 13 has an outer edge 1 of the lid member 15.
Along the line 5A, a cutting line 18 serving as a line of weakness is formed with a notch 19 on the inner side of the belt-shaped seal portion 16 by a dimension T. The depth of these cutting lines 18 and notches 19 is preferably such that they reach the interface between the inner layer part 11 and the outer layer part 12, but the point is that when the lid material 15 is opened, the inner layer part 11 It is sufficient that the outer layer 12 can be peeled off from the cutting line 18 to the notch 19 and the container can be opened.

Here, the material of the container body 10 is not particularly limited, and may be polyolefin resin, polystyrene resin, polyamide resin, polyester resin, polycarbonate resin, or a mixture thereof, or a thermoplastic elastomer, or various kinds of materials. 5 additives or inorganic fillers
There are resins mixed with ~70% by weight, metal foils, etc. A combination of layers made of these materials may be used to select a material that achieves the desired peel strength.

It is preferable to use materials with excellent strength and heat resistance as the materials for the outer layer 12 and the lid 15 that are in contact with the inner layer 11 of the container body 10.

The preferable material (a) of the inner layer part 11 and the preferable material (a) of the outer layer part 12 are
Examples of combinations of materials (b) include, but are not limited to, the following combinations.

(a) polyethylene resin such as high density polyethylene or low density polyethylene, (b) mixed resin of polypropylene resin and polyethylene resin, (a) mixed resin of polypropylene resin and (b) mixed resin of polypropylene resin and polyethylene resin, (a) low density Polyethylene and (b) high-density polyethylene resin, (a) ethylene-vinyl acetate copolymer and (b) mixed resin of polypropylene resin and polyethylene resin, (a) ethylene-vinyl acetate copolymer and (b) ethylene-propylene Mixed resin of random copolymer resin, (a) mixed resin of polypropylene resin or polypropylene resin and polyethylene resin, (b) mixed resin of inorganic filler-containing polypropylene resin and polyethylene resin, (a) mixed resin of polypropylene resin and polyethylene resin and (b) high density polyethylene resin containing inorganic filler, (a) homo or random polymerized polypropylene resin and (
b) high-density polyethylene resin containing inorganic filler, and (a) unsaturated carboxylic acid-modified polypropylene resin and (b)
)aluminum.

The container body 10 may be made of 2N made of the above-mentioned material, but for the purpose of improving gas barrier properties and reducing deformation when used as a container, it may be made of three or more layers made of other materials. Layers made of other materials that may be used in multilayer containers include, for example, resin layers such as ethylene-vinyl alcohol copolymer, polyvinylidene chloride, nylon, and polyethylene terephthalate, aluminum vapor-deposited layers, iron,
Examples include those having excellent gas barrier properties, such as metal layers such as aluminum. The layers of these other materials are 1
It may be a single layer, a multilayer body consisting of two or more layers, or a turret or fat layer containing 10 to 80% by weight of an inorganic filler.

The layer structure of the container main body 10 is appropriately selected depending on the sealant layer resin of the lid 15. For example, when the lid 45 is a polyethylene sealant layer, in the combination of the resin layers described above, a high density polyethylene layer is selected. Preferably, it is the inner layer portion 11 of the container body 10.

In addition, as long as the container main body 10 has the feature of having layer *a inside the multilayer container, a sealing layer, a heat resistant layer, an oil resistant layer may be added inside the innermost layer (inner layer portion 11) of the multilayer container as necessary. This container body 10 may have other layers such as 1. Using the above-mentioned combinations of resins, etc., the obtained coextruded multilayer sheet or laminate sheet is subjected to vacuum forming, pressure forming, drawing forming, press molding, etc., or multilayer injection molding, multilayer injection blow molding, multilayer blow molding. It can be obtained by etc. Furthermore, it can also be obtained by thermoforming a multilayer film on the inside of the container body 10, such as paper.

As the lamination process, methods such as extrusion lamination, hot melt lamination, dry lamination, and wet lamination can be used. By laminating these materials using adhesives, pressure-sensitive adhesives, etc., a multilayer material having suitable glabella releasability can be obtained.

Further, although the lid 15 is a single-layer film in FIG. 5, it may be a multi-layer film with two or more layers, and there is no particular limitation. film, multilayer film, paper,
A base material made of aluminum foil or a composite material thereof,
The innermost layer (inner layer 11) of the container body 10 is made of polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, etc., and a sealant layer made of resin that has easy heat sealability. Those that are suitable for use are preferably used.

Next, a first embodiment of the method for manufacturing the container will be described based on FIGS. 1 to 3.

FIG. 1 shows a schematic configuration of a manufacturing line for carrying out the manufacturing method of this embodiment. In FIG. After being sent to 22 and heated here,
It is sent to the container forming means 23. In the container forming means 23, the cup-shaped container body 10 is formed from the multilayer sheet 20 by, for example, vacuum forming or compressed air forming.

Next, the container main body 10 is sent to the content filling means 24, where the main body interior 10B is filled with the content, and then sent to the notch forming means 25, where the notch 19 is formed. This notch forming means 25 can be formed, for example, by a physical method using a notch blade or a cutting blade, a heating method such as fusing using a hot wire fusing (impulse) or a hot blade, a mechanical vibration method using ultrasonic waves, and an internal method using high frequency. It is formed by a heat generating method. At this time, the depth of the notch 19 is set to the depth of the outer layer 1 as described above.
Although it may stop at the inner layer part 11 even if it does not reach to 2, if it reaches to the outer layer part 12, the inner layer part 11 can be reliably separated from the outer layer part 12.

The container body 10 with the notch 19 formed therein is sent to the first sealing means 26 . As shown in FIG. 2, the first sealing means 26 includes a holding member 27 that holds the container body 10, a cutting member that is formed of a ring-shaped shearing blade that is disposed opposite to the holding member 27, and a bottomed cylindrical cutting member. The cutting member 28 has an edge 28 at the lower part of its outer periphery.
A, and is arranged so as to surround the seal member 29.

The specific operation of this first sealing means 26 is shown in FIG.
Shown in (D). I! Il! As shown in FIG. 3(A), the film 3 fed from the film supply roll 30 (see FIG. 1) is placed between the cutting member 28 and the sealing member 29.
1, the cutting member 2 is pressed downward to form a ring-shaped cutting line 18 on the flange portion 13, as shown in FIG. 3(B).

Thereafter, as shown in FIG. 3(C), the sealing member 29 is lowered, and the outside of the sealing surface 29A is a? The lid material 15 is punched out from the film 31, and the lid material 15 is attached to the flange portion 1.
3 is melt-sealed to form a band-shaped seal portion 16. Thereby, the outer edge 15A of the lid member 15 is aligned with the cutting line 18.
It is sealed to the flange portion 13 in a state consistent with that. Here, as a means for forming the band-shaped seal portion 16, an ultrasonic seal can be exemplified in addition to heat sealing.

After the lid material 15 is melt-sealed to the flange portion 13, the cutting member 2 and the sealing member 29 are returned to their original positions.

The container body 10 with the lid 15 melt-sealed by the first sealing means 26 is sent to the second sealing means 32 if necessary. In this second sealing means 32, the band-shaped sealing portion 16
A linear seal portion 17 is formed approximately at the center of the tube. Here, the means for forming the linear seal portion 17 can be exemplified by heat sealing, ultrasonic sealing, etc., similarly to the band-shaped seal 16 described above.

Note that the sealing means may be a linear seal as the first seal and a band-shaped seal as the second seal.

According to the first embodiment, the cutting line 18 is formed as a weakening line in the flange portion 13 of the container main body IO in advance by the cutting member 28, and then the sealing member 29 and the cutting lines arranged so as to surround this are formed. The lid material 15 is punched out from the film 31 using the member 2B, and the punched lid material 15 is melt-sealed to the flange portion 13 so that its outer edge 15A is along the cutting line 18, so that the following effects can be achieved. In other words, when the lid material 15 is pulled from the grip portion 15A toward the center of the container, the flange portion 13 begins to peel off from the cutting line 1B, which coincides with the outer edge of the band-shaped seal portion 16, so that the container Easy to open. Furthermore, since the cutting member 2 is arranged so as to surround the sealing member 29, the outer edge of the band-shaped seal portion 16 and the cutting line 18 can be reliably aligned, improving container productivity. The member 29 is used not only to form the band-shaped seal portion 16 but also to form the lid material 15.
Since it was also used for punching, the equipment became convenient and compact. Further, by replacing the seal member 29 with one having a different width dimension of the seal surface 29A, the seal width can be set arbitrarily.

1111 Next, a second embodiment of the present invention will be described based on FIGS. 6 and 7.

In the container manufactured in the second embodiment, the line of weakness formed in the flange portion 13 of the container body rO is replaced by a cut M18 with a recess 35, and the other configuration is the same as that of the container in the first embodiment. The same is true.

In the second embodiment, the line of weakness (recess 35) is formed at the same time as the band-shaped seal portion 16 is formed, and the other steps are the same as in the first embodiment.

That is, in the second embodiment, as shown in FIGS. 6 and 7, the first
The sealing means 26 includes the holding member 27, a sealing member 36 and a cutting member 37 arranged opposite to the holding member 27.
The sealing member 36 has a sealing surface 36A and an edge 36B for forming a recess formed on its lower surface. Further, the cutting member 37 is a ring-shaped fixed blade arranged so as to surround the sealing member 36. The first sealing means 26 shown in FIG. 6 has an edge 36B formed on the outer edge of the sealing member 36, and the first sealing means 26 shown in FIG. is formed.

In this first sealing means 26, first, the sealing member 36 descends to punch out the lid material 15 from the film 31, and then the sealing member 36 continues to descend to press the lid material 15 between it and the holding member 27. .

As a result, the band-shaped seal portion 16 is formed on the flange portion 13 by melt sealing, and the recess portion 35 is formed by the edge 36B.

In this second embodiment as well, the same effects as in the first embodiment can be achieved, and since the cutting member 37 is a fixed blade, means for moving the cutting member 37 can be omitted. The device can be made more cylindrical.

Next, a third embodiment will be described based on FIGS. 8 to 10.

In the container manufactured in the third embodiment, a groove 40 having the same shape as the recess is provided inside the band-shaped seal portion l6 in place of the notch 19.
This embodiment differs from the 1.2 embodiments in that a .

In the third embodiment, this groove 40 was formed at the same time as the band-shaped seal portion 16 was formed, and the other steps were the same as those of the previous embodiments.

That is, in the third embodiment, the first sealing means 26 shown in FIG. 8 and FIG. has an inner edge 41A for forming a groove on the inside with the sealing surface 41C on its lower surface, and the recess 35 on the outside.
An outer edge 41B is formed for forming the outer edge 41B.

Note that the sealing member 41 in FIG. 10 has an inner edge 41A.
A notch groove 41D is formed near the.

In the first sealing means 26 configured in this way, the sealing member 41 is lowered to punch out the lid material 15 from the film 31 (and the punched lid material 15 is The band-shaped seal part 6 is formed by melt-sealing the flange part 13, and at the same time, the edge 41A is sealed.

The groove 40 and the recess 35 are formed by the groove 41B.

Further, the first sealing means 26 in FIG.
7 (see FIG. 2), is composed of a cutting member 28 and a sealing member 42, and this sealing member 42 has an edge 42A for forming a groove inside the sealing surface 42B on the lower surface thereof.

In the first sealing means 26 configured in this way, after forming a cutting line on the flange portion 13 with the cutting member 28, as in the case of the first embodiment, the sealing member 42 is lowered and the film 31 ( A band-shaped seal portion 16 is formed by punching out a lid material 15 from a material (see FIG. 2) and melt-sealing the punched-out lid material 15 to the flange portion 13. here,
At the same time as this band-shaped seal portion 16 is formed, a groove 40 is formed by the edge 42A.

According to the third embodiment, the same effects as the first embodiment can be achieved, and since the groove 40 is formed at the same time as the melt seal, the device can be simpler than the first embodiment. can be achieved.

In each of the above embodiments, the linear seal portion 17 was formed at the center of the band-shaped seal portion 16, but the present invention does not necessarily require the step of forming the linear seal portion 17. By forming the linear seal portion 17 as in the embodiment, the sealing performance of the container can be improved.

Further, in the present invention, the notch 19 may be formed at the time when the container body 10 is formed by the container forming means 23 or when the contents are filled by the contents filling means 24.

Further, the bent portion formed on the flange portion 13 of the container body 10 may be a rib or a curl in addition to the skirt portion 14 of each of the embodiments described above.

[Effects of the Invention] According to the present invention as described above, when sealing the storage material, the line of weakness and the edge of the seal are broken, and the container can be easily opened, and the process can be omitted. This has the effect of improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a line for implementing the first embodiment of the present invention, FIG. 2 is a schematic diagram of a first sealing means used to implement the main part of the first embodiment, and FIG. Figure 3 (A
) to (D) are explanatory diagrams of the operation of the first sealing means, FIG. 4 is a plan view of the container manufactured in the first embodiment, and FIG.
6 and 7 are schematic configuration diagrams of the first sealing means used to carry out the second embodiment of the present invention, and FIGS. FIG. 10 is a schematic diagram of the first sealing means used to implement the third embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Container body, 11... Inner layer part, 12... Outer layer part, 13... Flange part, ]5... Lid material, 16...
... Band-shaped seal part, 17... Linear seal part, 18.3
5... Cutting line as a line of weakness, recess, 26... First
Sealing means, 27...Second sealing means, 27...Holding member, 28°37...Cutting member, 29.36,41
．． 42... Seal member. (A) CB) No. (C) (D) 10--1? Usumoto Ihon 13・-Flanno;Color F 15・-*n Fig. 10--9 Container (inside 5-4-11-・-, /v-18-Tamekibari)

Claims (1)

[Claims] (1) A method for producing a container in which a container body having a flange portion is formed including an inner layer portion facing the inside of the main body and an outer layer portion that is peelably superposed on the inner layer portion, and a lid material is melt-sealed to the flange portion. Then, a lid material is punched out from the film using a sealing member and a cutting member arranged to surround the sealing member, and the punched lid material is melt-sealed to the flange portion by the sealing member, and before this melt-sealing, Alternatively, a method for producing a container is characterized in that a line of weakness is formed along the outer edge of the melt seal at the flange portion at the same time.