JPH11235768A - Liquid paper container, body sticking sleeve, and method and apparatus for its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely cover exposed end faces of a pair of stuck ends of a blank for constituting a liquid paper container. SOLUTION: The liquid paper container P is formed of a folded blank 10. The blank 10 has a pair of sticking ends 10a, 10b stuck to one another. A tape material 11 for covering the end face of the blank 10 exposed at inner surfaces of the ends 10a, 10b is provided at the ends 10a, 10b. The material 11 is molded by an extrusion molding, and adhered to one sticking end 10a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid paper container for storing a liquid, a body sticking sleeve, a method for manufacturing the same, and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art Liquid paper containers are widely used in various forms as containers for milk, juice, mineral water, sake and the like. However, when the outer surface of one end and the inner surface of the other end of the carton blank are laminated and formed into a tubular shape at the stage of forming the paper container, the cross section (end surface) of the paper comes into contact with the contents, and the paper odor is reduced. And the components of the contents are adsorbed to the paper layer.

Conventionally, as a method for treating the end face of a liquid paper container,
A tape material is made from a laminate by lamination or the like, and the tape material is applied in a “U” shape so as to cover the end face to prevent the end face from being exposed. The hemming method that prevents the end face from being exposed by folding it back to the outer surface, and the skive hemming method that prevents the end portion from being exposed by grinding only half of the carton blank paper and folding back the half of the remaining part. is there.

Recently, a method of coating the entire end face of a carton blank with a resin water-resistant coating material such as melamine formaldehyde by a spraying method to cover the end has been studied (Japanese Patent Laid-Open No. 6-122441).

However, in the conventional tape application method, when a tape material obtained by slitting the laminated body is adhered to the end of the carton blank, the cross section of the end of the tape material comes into contact with the contents, and the tape material lamination portion is formed. There are problems such as peeling of adhesive and elution of adhesive components. Further, in the method of pasting a tape on the "U" -shaped or carton-formed body pasting portion afterwards, productivity is low, and the tape pasting process is rate-determining in the tube pasting process.

[0006]

On the other hand, in the hemming method and the skive hemming method, there is a problem of folding back and a problem of paper dust, and at present, it is not possible to obtain sufficient productivity and hygiene. is there.

The use of a water-resistant coating material such as melamine formaldehyde or the like may impair the flavor of the contents, and from the viewpoint of hygiene, is particularly useful for liquid foods such as milk, dairy products and juices. Is substantially restricted.

Accordingly, the present invention relates to a liquid paper container formed by attaching a tape material to an inner surface of a paper joint of a liquid paper container so as to cover an end surface of the paper and joining the paper joint portion.
In particular, it is possible to extend the quality retention period by preventing the intrusion of viruses and bacteria from the edge, especially those with a high dissolution property and high flavor of the liquid in the contents, and furthermore,
It is another object of the present invention to provide a method for treating an end face of a liquid paper container in which the end face is completely covered, the method is simple, and the productivity is sufficiently considered.

The present invention has been made in view of the above points, and a liquid paper container and a body sticking sleeve capable of easily and surely covering the exposed end surfaces of a pair of bonding ends of the liquid paper container. , A manufacturing method thereof, and a manufacturing apparatus thereof.

[0010]

SUMMARY OF THE INVENTION The present invention is folded,
A body sticking sleeve, comprising: a blank having a pair of sticking ends that are stuck to each other, and a band-shaped covering material provided at the pair of sticking ends and extruded.

Providing a blank having a pair of bonded ends and having a heat seal layer on both sides;
A step of providing a band-shaped covering material by extrusion molding at one bonded end of the blank, and a step of folding the blank to bond a pair of bonded ends and welding the coated material to the other bonded end; A method for manufacturing a body pasting sleeve, comprising:

A blank transport device for transporting a blank having a pair of bonded edges and having a heat seal layer on both sides, and a band-shaped coating material on one of the bonded edges of the blank transported by the blank transport device. An extrusion molding device for extruding and bonding, and a blank provided on the downstream side of the extrusion molding device, folding the blank, laminating a pair of lamination ends of the folded blank, and applying the coating material to the other lamination end. And a sleeve forming device for forming a body pasting sleeve by welding to the body.

[0013] A blank having a pair of opposing bonded ends folded and bonded to each other, and a strip-shaped covering material provided at the pair of bonded ends and extruded. Liquid paper container.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 are views showing a first embodiment of the present invention.

The method for treating an end face of a liquid paper container according to the present invention is a new end face treatment method for covering a cross section of a blank exposed on the inner surface of a blank constituting the liquid paper container when joining the end faces of the blank.

1 (a) to 1 (d) are views showing an embodiment of a liquid paper container according to the present invention. FIG. 1 (a) is an external perspective view thereof, and FIG. 1 (b) is an inner surface thereof. Development view from the side,
FIG. 1C is a sectional view taken along the line XX of FIG. 1B, and FIG.
FIG. 3 is a cross-sectional view showing an end portion covered state by a tape material. Figure 2 is a Y ₁ part enlarged sectional view of FIG. FIG. 3 is a perspective view illustrating the configuration of a tape material (coating material) used in the present invention. FIG. 4 is a partial view of the tape applied state used in the present invention viewed from the inner surface side of the blank. FIGS. 5A and 5B
5A and 5B are views showing heating of the tape material of the present invention and covering of a joint portion, in which FIG.
(B) is a sectional view at the time of covering the end.

As shown in FIGS. 1 (a) to 1 (d) and FIG. 2, the liquid paper container P in the method for treating an end face of a liquid paper container according to the present invention comprises a paper layer 6 and both sides of the paper layer 6. The blank 10 is formed by using a blank 10 made of a laminate having the provided heat-adhesive resin layers 7 and 8. In this case, the blank 10 has panels 1, 2, 3, 4, and 5.

The liquid paper container P is a liquid paper container such as a tetrahedron, brick type or goebel top type, and each of the containers P is formed by joining the bonded end portions 10a and 10b at one end. Is what is done. End 10a,
When the layers 10b are joined to each other, the end face 9 of the laminate is exposed on the inner surface of the container P, so that there are various problems with the contents as they are, which is not preferable. In the present invention, the end face 9 of the blank 10 of the liquid paper container P is covered with a band-shaped tape material (coating material) 11. In the following description,
The description will be made by taking the above-mentioned liquid bottle of the gobel top type as an example with reference to the drawings.
The present invention can be similarly applied to a paper container for processing an end face of a paper container formed by joining a and 10b to each other.

The tape material 11 used in the method for treating the end face of the liquid paper container P according to the present invention comprises a central layer 11a and a coating layer 11b covering the central layer 11a.
It is preferable that b is made of a resin having thermal adhesiveness to the innermost surface of the liquid paper container.

Although the present invention is basically applied with tape, the end portion 1 of the blank 10 in a flat state before being attached to a cylinder is used.
The tape material 11 is pasted on the tape material 0a, and the blank end face is covered with the tape material 11 by heat at the time of joining the pair of bonded ends 10a and 10b of the blank 10 in a frame sealing machine (sleeve forming device). It is what you do.
Therefore, the tape application of the tape material 11 to the blank 10 in the method for treating the end portion of the liquid paper container P of the present invention may be performed separately from the body attaching process, or may be performed in conjunction with the frame sealing machine. The tape material 11 may be bonded immediately before the application.

FIG. 1 shows a method for attaching a tape according to the present invention.
As shown in FIG. 1 (b) and FIG. 1 (c), a tape material 11 is applied to a predetermined width only on the inner surface side of the end 10a of the panel 5 of the carton blank 10 of the liquid paper container, and a part of the width of the tape material 11 Is made to protrude from the end 10a of the blank 10. The blank 10 thus obtained is directly applied to a frame sealing machine. Fig. 5
As shown in (a), the outer surface of the end 10a of the blank 10 including the protruding portion of the tape material 11 is softened by the frame heat from the heating device F. In a later bonding step, the panel 5 and the tape material 11 are simultaneously nipped, so that the softened protrusion of the tape material 11 has a pair of end portions 10a and 10a as shown in FIG.
The blank end face will be covered at b.

As described above, the method for treating the end of a liquid paper container according to the present invention is a method that does not have to be troublesome in that the tape material 11 is folded back and further sealed, so that the productivity is improved. .

Usually, since both surfaces of the blank 10 of the liquid paper container are covered with thermoplastic resin layers 7 and 8 such as polyolefin, the material of the coating layer 11b on the surface of the tape material 11 used in the present invention is at least It is necessary that the resin is the same as the thermoplastic resins 7 and 8 of the liquid paper container P and has thermal adhesiveness. The center layer 11a of the tape material 11 is preferably a high-melting-point thermoplastic synthetic resin such as polyethylene terephthalate or nylon and has a certain degree of rigidity in a film-formed state.

In the present invention, a more preferable tape material (coating material) 11 includes a center layer 11a as shown in FIG.
A cover layer 11b covering the central layer 11a (hereinafter, referred to as a cover layer
Described as co-extrusion tape). The central layer 11a
An adhesive layer 11c may be interposed between the adhesive layer and the coating layer 11b. Central layer 11a of co-extruded tape material 11
Has a rigidity as a tape material and has a higher heat resistance than the coating layer 11b. Specifically, medium density polyethylene, high density polyethylene, polyethylene terephthalate, nylon, polycarbonate and the like can be used.

The coating layer 11b of the co-extruded tape material 11
Is selected from resins having a thermal adhesive property with the polyolefin and the like of the thermoplastic resin layers 7 and 8 of the blank 10. Specifically, low-density polyethylene, medium-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer,
Ethylene-α-olefin copolymers, ionomers, and the like polymerized using a single-site catalyst can be used.

The co-extruded tape material 11 can be obtained by extruding into a flat tape shape with a co-extruder of two or three layers or three or five layers, pressing and cooling.

When the liquid paper container P is formed by covering the end surface 9 of the blank 10 with the co-extruded tape material 11, the cross-section as a tape does not exist inside the container. Adhesives and the like used for lamination during tape production do not elute into the contents.

Co-extruded tape material 11 used in the present invention
In particular, it is important to use a high melting point thermoplastic resin for the center layer 11a of the tape material for the following reason. That is, after the tape material 11 is bonded to the carton blank 10, the panel 5 and the tape material 11 are simultaneously nipped in a bonding step of the body bonding portion,
As shown in FIG. 5B, the protruding portion of the tape material 11 provided at one softened end 10a is connected to the other end 10a.
b and is coated so as to cover the end face of the blank 10. At this time, by providing a high melting point thermoplastic resin layer on the central layer 11a of the tape laminate 11, the tape material 11 contracts due to excessive heat of the frame, and furthermore easily adheres to the inner surface side opposite to the joining surface, thereby blocking. It can be prevented from being caused.

On the other hand, as another method for preventing such blocking, there is a method of increasing the total thickness of the tape material 11. That is, it is because softening of the tape material 11 due to heat can be reduced.

Accordingly, the total thickness of the tape material 11 is preferably 70 μm or more, and more preferably 100 μm or more when the high melting point thermoplastic resin layer is included in the center layer 11 a. 1 if the tape material 11 is made of a single layer
It is preferably 50 μm or more, more preferably 200 μm or less. However, in both cases, 200 μm was used.
If it exceeds m, the trace of the tape clearly emerges from the appearance, which is not preferable.

The adhesion position of the carton blank 10 of the tape 11 is a tape bonded portion as shown in FIG. 4 W ₁
It is bonded in the parts, providing the protruding portion W ₂ at this time. The carton blank 10 is put into the body sticking process as it is.

That is, when the protruding portion W ₂ is heated and simultaneously nipped in the protruding portion of the panel 5 and the tape material 11 in the subsequent bonding step of the body bonding portion, the blank 1
This is because the end face 9 is coated so as to cover the end face 9 and the end face is processed as a result.

At this time, the width of the protruding portion W ₂ is 0.5 mm
It is desirable that it is not less than 20 mm. That is, the width of the protruding portion W ₂ is bonded a body bonded portion is less than 0.5mm step, when the fifth panel portions and the tape portion is nipped at the same time, it is difficult to completely cover the paper joint inner surface On the other hand, if the thickness is 20 mm or more, the body-applied frame heat does not reach the entire tape in the portion a, and there is a portion that does not adhere to the paper bonding portion.

Conventionally, the protruding portion, the width corresponding to W ₂ , has been further folded back toward the outer surface and sealed on the back surface, and the complexity of this step has prevented an increase in productivity.

Tape material 1 on end 10a of blank 10
1 is adhered to the upper surface of the carton blank 10 at the stage of the carton blank 10 by a method such as a frame seal, a hot air seal, an ultrasonic seal, or a far-infrared seal.

In the present invention, when the tape material 11 is adhered to the carton blank 10, the tape material 11 is supplied as a continuous tape material 11 unwound from winding.
The blank 10 is sheet-like. Since the tape material 11 is continuously attached to the end 10a of the blank 10, it is necessary to cut the tape material 11 for each carton blank 10. Also in this case, since the upper and lower ends, particularly the edges, of the cut tape material 11 are softened by the heat of the frame in the body bonding step, there is a risk of blocking when the body part is bonded later. . Therefore, as shown in FIG. 4, the top part W ₃ and the bottom part W ₄ of the carton blank 10 protrude, but there is no particular problem as long as the respective lengths are within 8 mm, but preferably 3 mm or less. The tape material 1 is applied to one end by the above process.
Next, the carton blank 10 to which 1 has been bonded proceeds to the body sticking step.

In the body sticking step, as shown in FIG. 5 (a), the outer surface of one end 10 of the blank 10 which is superimposed on the inside during the joining is heated by the heating device of the frame sealing machine. At this time, the heat of this frame causes the tape material 1
The one non-adhesive portion is also heated, and is thermally bonded by being pressed against the inner surface of the other end 10b of the blank to be polymerized. As a result, the blank end section is covered. As the flow of the blank 10, the carton blank 10 is set in a feeder of a frame sealing machine,
The outer surface of the panel 5 is roasted by the heating device F as it is, the inner surface of the panel 1 is further roasted, and the body bonding process proceeds through the nip of the body bonding portion and the tape portion. Done. At this time, the pressure of the body sticking portion and the tape portion is adjusted so that the tape material 11 is sufficiently adhered.

The carton 10 in the form of a cylinder or a sleeve, which has been pasted on the body, is directly used in a liquid filling and packaging machine.
Molding, filling and hermetic sealing are possible.

Further, according to the present invention, the tape material is adhered to only one end of the carton blank without the troublesome process of folding and sealing the tape material, and the tape material is set on the frame sealing machine as it is. By performing body sticking with a seal, it is possible to cover the end face inside the joint of the blank. For this reason, the apparatus is simplified and productivity is improved.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.

In the first embodiment, a tape material (coating material) is used.
11 is different from the first embodiment shown in FIGS. 1 to 5 only in the configuration.

6 to 8, the same parts as those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 6A and 6B are cross-sectional views illustrating the material composition of the tape material of the present invention.
FIG. 6B is a diagram showing a case of two types and three layers, and FIG.
It is a figure showing the case of a layer. FIG. 7 is a cross-sectional view illustrating a laminate of paper container blanks according to the present invention.

FIG. 8 is a sectional view of a blank end and a sectional view of the structure of each tape material showing the covering state of the tape materials of the example and the comparative example.

As shown in FIGS. 1A and 1B and FIG. 2, the liquid paper container P is formed by using a blank 10 made of a laminate including a paper layer having heat-adhesive resin layers 7 and 8 on both surfaces. Is done. The liquid paper container P is a liquid paper container such as a tetrahedral, brick type or goebel top type, and both containers are formed by joining the ends 10a and 10b of the blank 10 together. When the end portions 10a and 10b are joined together, the end surface 9 of the blank 10 is exposed on the inner surface of the container P, so that there are various problems with the contents as they are, which is not preferable. Therefore, in order to completely cover the end face 9 of the blank 10, the bonding ends 10a and 10b of the blank 10 are attached.
Is provided with a tape material 11.

The blank 10 constituting the liquid paper container P according to the present invention is, for example, as shown in FIG.
, Paper layer 101, adhesive layer 105, barrier layer 104
, An adhesive layer 105 and an innermost layer 103 may be used.

Specific examples of the material and thickness of the blank 10 include the following as the structure of the laminated body 100 used for the gobel-top type liquid paper container P.

LDPE25 / paper 320 ^{# 1)} / AD15 / SiOx PET15 / LMD / S-PE60 [abbreviation LDPE: low-density polyethylene, AD: adhesive resin, SiOx PET: silica-deposited polyester film, LMD: dry laminate, S -PE: ethylene-α-olefin copolymer polymerized using a single-site catalyst] Further, the numerical value attached after each abbreviation indicates the thickness (μm) of each layer, and only paper 320 ^{# 1)} is g / m. Indicated by ² .

In this case, the barrier layer 104 is made of SiOx PE
T.

Next, the tape material (covering material) 11 for covering the blank joint of the liquid paper container P formed from the laminate 100 made of the above-described material will be described.

The tape material 11 used for the liquid paper container P according to the present invention comprises a central layer 11a as shown in FIG.
The coating layer 11b may have a two-layer structure, or as shown in FIG. 6B, an adhesive layer 1 may be provided between the center layer 11a and the coating layer 11b.
1c may be provided.

The tape material 11 can be made by a co-extrusion film forming method, and is extruded by a co-extruder and pressed to form a film to form a tape.

Next, the material of the tape material 11 will be described in more detail. As the resin constituting the central layer 11a, polyethylene terephthalate, nylon, ethylene vinyl alcohol, polyvinylidene chloride, high-density polyethylene and the like can be used, but polyethylene terephthalate and the like can be used.

The thickness of the layer is preferably from 1 to 100 μm after coextrusion, pressing and film formation.

The resin constituting the coating layer 11b surrounding the central layer 11a is a resin having thermal adhesiveness to the innermost surface of the liquid paper container, and specifically, polyethylene, polypropylene, ethylene-vinyl acetate copolymer. Coalesce, linear low-density polyethylene, ethylene-α-olefin copolymer polymerized using a single-site catalyst, ionomer, and the like. The thickness of the coating layer 11b is co-extruded,
After pressing and film formation, the thickness is preferably 1 to 20 μm.

The tape material 11 used in the present invention
As the physical properties, the rigidity, hardness, softening point and the like are important. The rigidity or hardness is such that the tape material 11 is held in a state where the tape material 11 is adhered to some of the ends 10a and 10b of the blank 10 and the coating is not incomplete due to breakage in a frame sealing process described later. It is necessary physical property. Specifically, the center layer 1 of the tape material 11
Olsen rigidity (ASTM D 7
47 by the measuring method described) it is desirable that 2000 kg / cm ² or more 30000kg / cm ² or less.

If the Olsen stiffness is less than 2000 kg / cm ² , the tape 11 loses its rigidity, and the tape 11 is violent by the force of the transport during the transport of the blank 10 in the cylinder sticking process, so that the coating at a predetermined position is not possible. It becomes difficult. When the Olsen stiffness exceeds 30,000 kg / cm ² , the stiffness becomes too strong, and the hot tack property is insufficient at the time of molding the paper container and at the time of heat bonding with the thermoadhesive resin on the inner surface of the carton, resulting in poor sealing. Also, molding of the tape itself becomes difficult.

The resin forming the central layer 11a of the tape material 11 preferably has a Vicat softening point (according to the measuring method described in ASTM D1525) of 80 ° C. or more and 300 ° C. or less. Vicat softening point (ASTM D152
If the temperature is lower than 80 ° C., the tape material 11 will break due to heat, and it will not be possible to coat the tape at a predetermined position. Further, when the Vicat softening point exceeds 300 ° C., the tape material 11 is hardly softened by heat, which causes poor sealing.

The melting point of the resin constituting the center layer 11a of the tape material 11 (according to the measuring method described in ASTM D2117) is desirably 100 ° C. or more and 400 ° C. or less. When the melting point of the resin is less than 100 ° C., the tape has a weak stiffness, and it is difficult to stably adhere the tape material 11 to a predetermined position. When the melting point of the resin exceeds 400 ° C., the tape material 11
Does not soften and causes poor adhesion.

The thickness of the adhesive layer 11c is preferably 0.1 to 3 μm after co-extrusion, pressing and film formation. The thermo-adhesive resin used for the adhesive layer 11c is a thermo-adhesive resin having a high functional group made of an electrode, and is bonded to polyethylene or polyester in a molten state by co-extrusion to bond the two layers. . Specific examples thereof include unsaturated carboxylic acid-modified polyolefins and ethylene-α-olefin copolymers.

The tape material 11 according to the present invention has a width of 5 to 10 m.
Extrusion film formation at about m. The coating of the ends 10a and 10b of the blank 10 of the liquid paper container P may be performed after the tape material 11 is formed and then the tape is reheated in another process. It is also possible to make use of the heat of extrusion at the time of co-extrusion film-forming of 11 and heat-bond it to the end of the liquid paper container immediately after film formation.

The total thickness of the tape material 11 is 100 to 200 μm
The width is preferably about 5 to 10 mm.

As described above, the tape material according to the prior art is formed by laminating a base film and a heat-adhesive film in a wide width using an adhesive or the like after forming a film, and then slitting the tape into a ribbon shape. Although the cross section of the material was exposed, there was a concern that the components of the adhesive used for the lamination would elute into the contents or that the odor of the adhesive would transfer. However, the liquid paper container P using the tape material 11 according to the present invention was used. According to width 5-10m
m, the central layer 11a is extruded by a co-extrusion method, and the central layer 11a is surrounded by a coating layer 11b corresponding to a heat-adhesive film. And only the innermost surface layer of the blank 10 and the coating layer 11b of the tape material 11. As a result, there was no such concern.

With the liquid paper container of the present invention, the bonding end of the blank is completely covered, and the end face of the blank does not penetrate the contents into the paper, thereby maintaining the strength of the body sticking portion. A liquid paper container can be provided.
In addition, there is no elution of contents such as adhesive components or residual dressmaking components caused by the coating tape, and as a content that can be stored in paper containers, a delicate flavor can be used as a selling point or high hygiene is required. Liquid or the like can be filled.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. 9 to 19, the same parts as those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The embodiment shown in FIG. 9 to FIG.
The present invention relates to a method and an apparatus for manufacturing the liquid paper container P shown in (a)-(b) and FIG.

The liquid paper container P is manufactured by assembling and sealing the body sticking sleeve S shown in FIG. Further, this body sticking sleeve S is a blank 10 having a pair of opposed joining ends 10a and 10b which are folded and attached to each other, and an extruded strip-shaped provided on the pair of joining ends 10a and 10b. (See FIG. 2).

The blank 10 is composed of panels 1, 2 and
The blank 10 comprises a paper layer 6 as an intermediate layer and thermoplastic resin layers (heat sealing layers) 7 and 8 provided on both sides of the paper layer.

As shown in FIG. 2, the tape material (covering material) 11 covers the inner end face 9 of the blank 10 and prevents the liquid stored in the liquid paper container P from penetrating into the inner end face 9. Is what you do. The tape material 11 includes a central layer 11a having relatively high strength such as high-density polyethylene and a central layer 1a.
1a, and a coating layer 11b made of low-density polyethylene or the like provided on the outer periphery of 1a (see FIGS. 16A and 16B).

Next, a description will be given of an apparatus for manufacturing a body sticking sleeve. As shown in FIGS. 9 to 19, the body pasting sleeve manufacturing apparatus 20 includes a blank feeder 25 that supplies the blank 10, a blank transport apparatus 21 that transports the blank 10 supplied by the blank feeder 25, and a blank feeder 21. An extruder 2 for extruding and adhering a strip-shaped tape material (coating material) 11 to one of the bonding ends 10a.
3, a cooling device 30 provided on the downstream side of the extrusion molding device 23 and cooling the tape material 11, and a cooling device 30 provided on the downstream side of the cooling device 30 and bonded to one of the bonding ends 10a. And a cutting device 50 for cutting both ends.

Further, on the downstream side of the cutting device 50, a heating device F for simultaneously heating one of the bonding ends 10a of the blank 10 and the tape material 11 is provided (FIG. 16). Is a pair of bonding ends 1 of the folded blank 10 while folding the blank 10
There is provided a sleeve forming apparatus 70 for bonding the tape materials 0a and 10b and bonding the tape material 11 provided at one bonding end 10a to the other bonding end 10b to form the body bonding sleeve S ( FIGS. 18A and 18B).

Next, the configuration of each part will be described in more detail. As shown in FIGS. 10A and 10B, the blank feeder 25 supplies blanks 10 one by one, and the next blank 10 is stopped by the stopper 25a so that the blanks 10 are supplied one by one. It has become.

As shown in FIGS. 10A and 10B, the blank conveying device 21 includes a conveying belt 22 having projections 22a arranged at predetermined intervals and a plurality of blanks arranged downstream of the conveying belt 22. And a positioning roll 24. Here, FIG. 10A is a side view of the blank transport device 21 and FIG. 10B is a plan view thereof. Conveyor belt 2
Numeral 2 is for transporting the blank 10 at a predetermined interval while pressing the blank 10 by the projection 22a. A side plate guide 24a is arranged on the side of the positioning roll 24. Further, as shown in FIG. 10B, the positioning roll 24 is slightly inclined with respect to a direction orthogonal to the side plate guide 24a. For this reason, while the blank 10 is pressed against the side plate guide 24a, the side edge of the blank 10 is
Aligned by. Thus, the positioning of the blank 10 is performed.

Next, the extruder 23 will be described with reference to FIG. Here, FIG. 11A is a side view of the extrusion molding apparatus, FIG. 11B is a plan view thereof, and FIG.
It is a C section enlarged view of (b). The extruder 23 adheres the extruded strip-shaped tape material 11 to one of the bonding ends 10a of the blank 10. The extruder 23 forms a central layer 11a by co-extrusion and a coating layer 11b surrounding the central layer 11a.
Is formed.
The tape material 11 molded from the extrusion molding device 23 is a continuous strip, and both ends of the tape material 11 bonded to the blank 10 are cut by the cutting device 50 on the downstream side.

Note that a pre-heating device for pre-heating one of the bonding ends 10a of the blank 10 in advance, for example, a far-infrared heater or a dryer 60 may be provided upstream of the extrusion molding device 23. The tape material 11 molded from the extrusion molding device 23 is cooled by the cooling device 30 in a later process and then cut by the cutting device 50.
It is preferable that the temperature is maintained at a low temperature. Dryer 6
No. 0 preheats the blank 10 so that it can be easily adhered to the end 10 a of the blank 10 even if the tape material 11 is at a low temperature.
Hot air at 00 ° C. is blown against the blank 10.

It is preferable that the tape material 11 bonded to one end 10a of the blank 10 protrude by a length l _{1 of} 0.5 to 20 mm in a direction perpendicular to the tape material 11.

Next, the cooling device 30 is shown in FIG.
This will be described with reference to FIG. FIG.
FIG. 12A is a side view of the cooling device, and FIG. 12B is a plan view thereof. As shown in FIGS. 12A and 13B and FIG. 13, the cooling device 30 includes a cover 30 a to which a nozzle 36 for supplying cooling air is attached, three receiving rolls 31 arranged in the cover 30 a, And a cooling forming roll 32 for holding and cooling the tape material 11 adhered to the blank 10 with the receiving roll 31.

The receiving roll 31 is rotatably held by a shaft 31a, and is cooled by cooling water flowing in the shaft 31a. Further, a Teflon belt 35 is wrapped around the surface of each receiving roll 31 in order to increase the releasability of the tape material 11 formed from the extrusion molding value 23.

The cooling roll 32 is rotatably held by a shaft 32a, and the cooling roll 32 is formed with a forming recess 33. The concave portion 33 for molding is formed on the tape material 1 adhered to the blank 10 by the extrusion device 23.
1 is formed, and the cross-sectional shape of the tape material 11 is set to a height L ₁ =
The shape is adjusted so that 0.05 mm to 0.8 mm, width L ₂ = 0.6 mm to 28 mm, and overall height L ₃ = 0.4 mm to 1.0 mm. Note that the receiving roll 31 and the cooling forming roll 32 are each 3
Although the example in which the individual pieces are arranged is shown, the numbers of the receiving rolls 31 and the cooling forming rolls 32 can be arbitrarily determined.

Next, the cutting device 50 is shown in FIG.
(B), (c) and FIGS. 15 (a) and (b) will be described. The cutting device 50 has a suction roll 51 that suctions the tape material 11 and a cutting roll 52 that is disposed to face the suction roll 51 and has a cutting blade 53 that cuts the tape material 11 with the suction roll 51. ing. The cutting device 50 is a tape material 1 bonded to one end 10a of the blank 10.
The tape material 11 is cut at both ends, and the scrap 55 of the cut tape material 11 is sucked by the suction roll 51 and discharged to the outside. In this case, the suction roll 51 has a suction hole 51a for sucking the tape material 11, and the suction hole 51a is
The shaft 56 communicates with a vacuum path (not shown) provided in the shaft 56.

[0081] After the tape 11 is cut by the cutting device 50, protrudes by a length l ₂ of 0~8mm outward from the blank 10 along its longitudinal direction (Fig. 17).

By cutting the tape material 11 with the cutting device 50 in this manner, a blank with a tape material (a blank with a coating material) can be obtained.

Next, the heating device F will be described with reference to FIGS. The heating device F simultaneously heats one end 10a and the tape material 11 before folding the blank 10, and the heating device F is arranged at a solid line position rather than a broken line position. Can be heated sufficiently.

FIG. 18 shows the sleeve forming apparatus 70.
This will be described with reference to (a) and (b). Here, FIG.
FIG. 19 is a partially enlarged view of FIG. FIGS. 18A and 18B
As shown in FIG. 7, the sleeve forming apparatus 70 folds the blank 10 and bonds the pair of bonding ends 10a and 10b of the folded blank 10 together with the tape material provided on one of the bonding ends 10a. 11 is adhered to the other end 10b to produce the body sticking sleeve S. The body pasting sleeve forming apparatus 70 includes a pedestal 71
And a pressing belt 72 for pressing the blank 10 and the tape material 11 between the receiving table 71 and the receiving table 71.

When the blank 10 and the tape material 11 are pressure-bonded between the receiving table 71 and the pressure-bonding belt 72 to form the body sticking sleeve S, the tape material 11 has one end 10
The length l _{3 of the a} -side is 0.1 mm to 8 mm, and the length l _{4 of the} other end 10 b is 0.5 to 20 mm.

Next, a description will be given of a method of manufacturing the body sticking sleeve. First, as shown in FIG.
5, blanks 10 are supplied one by one.
Is transported by the blank transport device 21. During this time, the blank 10 is accurately conveyed at predetermined intervals by the conveyance belt 22 having the projections 22a. Next, blank 1
In the case of 0, the positioning of the side edge is performed by the positioning roll 24 and the side plate guide 24a.

Next, one end 10 a of the blank 10 is preheated by the dryer 60, and the one end 10 a of the preheated blank 10 is extruded by the extruder 2.
The tape material 11 heated to about 3 to 160 ° C. is extruded and bonded.

Tape material 11 adhered to blank 10
Is then cooled by the cooling device 30,
The sectional shape of the tape material 11 is adjusted by the forming recess 32 a of the cooling forming roll 32.

After that, the tape material 11 adhered to the blank 10 is cut by the cutting blade 53 of the cutting roll 52 in the cutting device 50.

Next, the blank 1 to which the tape material 11 is adhered
0 is sent to a heating device F, and the heating device F heats the outer surface of one end 10a of the blank 10 and the outer surface of the tape material 11. Next, the blank 10 is folded by the sleeve forming device 70, and then the blank 10 and the tape material 11 are pressure-bonded by the receiving base 71 and the pressure-bonding belt 72. In this case, the outer surface of one end 10a of the blank 10 and the inner surface of the other end 10b are bonded together, and at the same time, the tape material 11 provided at one end 10a is attached to the other end 1a.
It is welded to the 0b side. In this way, the body sticking sleeve S
Is obtained (FIG. 19).

According to the present embodiment, the blank 1
The tape material 11 can be adhered to the tape 0, and the tape material 11 can reliably cover and protect the end face 9 of the blank 10.

[0092]

[Example 1] Example 1 and Comparative Examples 1 and 2 correspond to the first embodiment. Central layer 11a
The tape material 11 was obtained by co-extrusion of polyethylene terephthalate, EMAA as an adhesive layer 11c, and low-density polyethylene as a coating layer 11b having the same shape as the innermost surface of the container and having thermal adhesiveness. The thickness of each layer is 15 μm for the central layer 11a, 10 μm for the adhesive layer 11c, and 40 μm for the coating layer 11b having the same thermal adhesion as the innermost surface of the container.
The total thickness was 115 μm. The obtained film was slit into a width of 10 mm to obtain a tape material 11 for edge treatment. The low-density polyethylene 60 μm as the innermost layer of the blank 10 of the paper container P, and the milk board 320 as the paperboard
g / m ² , medium density polyethylene 20 as the outermost layer of the paper container
A blank 10 cut into a predetermined shape having a structure of μm is prepared, and the tape material 11 is heat-sealed on the inner surface side of the fifth panel with a seal width w ₁ of 3 mm and perpendicular to the grain of the blank 10. Adhered. Tape material protruding portion w ₂ is set to 7mm.

Further, the carton blank 10 of the tape material 11
Run-off portions from the upper end w _3, the lower end w ₄ respectively 3m
m, and the blank 10 to which the tape material 11 was adhered was produced. A liquid paper container P was obtained by heating and pressing the outer surface of one end of the blank 10 and the inner surface of the other end of the blank with a frame sealing machine, and pressing and bonding the blank.

Comparative Example 1 A low-density polyethylene film having a thickness of 50 μm was slit to a width of 10 mm to obtain a tape material 11 for treating an end surface. 60 μm of the low-density polyethylene as the innermost layer of the paper container, and milk board paper 320 as the paperboard
g / m ² , medium density polyethylene 20 as the outermost layer of the paper container
A carton 10 cut into a predetermined shape having a configuration of μm was prepared, and the tape material 11 was adhered to the inner surface side of the panel 5 with a seal width of 3 mm to the end of the carton blank 10 by heat sealing (tape). the width of the wood 11 protruding portion w ₂ is set to 7mm). Further, the portions of the tape material 11 protruding from the carton blank 10 are the upper end w ₃ and the lower end w ₄
Are cut by 3 mm each, and the tape material 11 is cut.
A blank 10 to which was adhered was produced. This blank 1
Then, the outer surface of one end of the blank and the inner surface of the other end of the blank were heated and pressurized by a frame sealing machine, pressed, and bonded to obtain a sleeve P for a liquid paper container.

[Comparative Example 2] Polyethylene terephthalate was used as the center layer 11a, ethylene methacrylic acid (EMAA) was used as the adhesive layer 11c, and low-density polyethylene was used as the coating layer 11b having the same system as the innermost surface of the container and three types of low-density polyethylene.
The layers were co-extruded to give a film. The thickness of each layer is the center layer 1
1a was 15 μm, the adhesive layer 11c was 10 μm, and the coating layer 11b having the same thermal adhesion as the innermost surface of the container was 40 μm, giving a total thickness of 115 μm. 7 m wide film
Then, the tape material 11 for edge treatment was obtained. The blank 10 was cut into a predetermined shape having a low-density polyethylene of 60 μm as the innermost layer of the paper container, 320 g / m ² of milk board paper as the paperboard, and a medium-density polyethylene of 20 μm as the outermost layer of the paper container. 11
The panel 5 on the inner surface side seal width 4mm perpendicular to Grainy blank, the taped material 11 by heat sealing (protruding portion w ₂ of the tape material 11 is 3 mm.) Further carton blank of the tape 11 The blank 10 to which the tape material 11 was adhered was manufactured by cutting the portion protruding from the upper end w ₃ and the lower end w ₄ so as to be 3 mm each. This blank 10 is used by a frame sealing machine.
The outer surface of one end of the blank 10 and the inner surface of the other end were heated and pressurized, pressed and bonded to obtain a sleeve for a liquid paper container.

The sleeve for a liquid paper container obtained as described above was formed using a dedicated liquid paper container forming, filling and sealing machine to obtain a liquid paper container P. A pinhole check was performed on each part of the obtained liquid paper container P, that is, on the top, side, and bottom using a 10% alcohol solution of methylene blue.

The results are as shown in Table 1.

[Table 1]

[Results] In the embodiment, the tape material 11 is applied only to the inner surface side of the panel 5 of the carton blank 10 of the liquid paper container P.
And the carton blank 10 was put on a frame sealing machine as it was. At the time of the body sticking process, the heat of the body sticking frame causes the outer surface of the blank end including the tape material protruding portion to be softened, and the panel 5 and the tape material 11 are simultaneously nipped in a later bonding process. By
The protruding part of the softened tape material 11 is covered so as to cover the inner surface of the paper joining part. However, in Comparative Example 1, since the melting point of the material constituting the tape material is relatively low, and furthermore, since the thickness of the tape material 11 is thin, the tape shrinks due to the heat of the frame, and the complete inner surface portion of the heat bonding is completely removed. No coating was achieved. Furthermore, in Comparative Example 2, the tape 11
However, since the width of the protruding portion c from the carton blank panel 5 is not sufficient, the tape material 11 is locally applied to the inner surface of the paper joint.
However, there was a part that did not adhere.

Example 2 Examples 2 and 3 and Comparative Examples 3 and 4 correspond to the second embodiment. Milk board base paper 313 g / m ² was used as the paperboard, 20 μm of low density polyethylene was laminated as the surface layer, and 40 μm of low density polyethylene was laminated as the innermost layer. A blank 10 was prepared by cutting the laminated body into a predetermined shape. End 10 of blank 10
a, a high-density polyethylene as the center layer 11a;
In the position surrounding the periphery of a, a low-density polyethylene is used as the coating layer 11b, which is the same as the innermost layer of the container and has a low-density polyethylene, and can be extruded in an elliptical shape. It was extruded by an extruder. This tape material 11 is attached to the end 10a of the body sticking portion on the back surface of the blank 10.
4mm width from the end of the adhesive
m to form a non-adhesive part, press immediately after extrusion molding, and press-bond to form a 4 m
m, a blank 10 to which a tape material having a shape in which the 4 mm tape material 11 protruded from the end of the body sticking portion was stuck was obtained. The thickness of each layer after the pressing of the tape material 11 is such that the thickness of the high-density polyethylene of the central layer is 80 μm, the low-density polyethylene is 10 μm as the coating layer 11b which is adhesive to the innermost layer of the container and is located around the central layer. became. The width of the tape material 11 after film formation was 4 mm at the end of the body sticking portion, and furthermore, the tape material at the non-adhered portion was located at a position protruding 4 mm, so that the total width was 8 mm.

The blank 1 to which the tape material 11 is attached
0 by a frame seal as shown in FIG.
The other end 10b of the outer surface of the blank 10 and the inner surface of one end 10a of the blank including the tape 11 are pressed, pressed, and adhered to each other so that the tape 1
Thus, a liquid paper container P was attached in such a manner that 1 covered the paper end face inside the frame seal portion.

Example 2 313 g / m ² of milk board base paper was used as a paperboard, 20 μm of low density polyethylene was laminated as the surface layer, and 40 μm of low density polyethylene was laminated as the innermost layer. A blank 10 was prepared by cutting the laminated body into a predetermined shape. As shown in FIG. 8B, the tape material 11 used for covering the ends 10a and 10b of the blank 10 is made of polyethylene terephthalate,
Unsaturated carboxylic acid-modified polyolefin as the adhesive layer 11c, and the innermost layer 103 of the blank 10 as the coating layer 11b.
A low-density polyolefin having the same adhesive property as that of the above is used, and an adhesive layer 11c is provided at a position surrounding the center layer 11a.
Is further provided at a position surrounding the periphery of the adhesive layer.
The tape material 11 was formed by a three-type, five-layer co-extruder capable of extruding in an elliptical shape with b disposed. This tape material 11 is attached to the end 10a of the body sticking portion on the back surface of the blank 10.
Immediately after the co-extrusion, it was pressed to a position of 4 mm above and 4 mm protruding from its end to be crimped. In this manner, a blank 10 was obtained in which the end 10a of the body sticking portion of the blank 10 was sealed by 4 mm, and the tape material 11 having a shape protruding 4 mm from the end 10a of the body sticking portion was stuck. The thickness of each layer after pressing is such that the thickness of the polyethylene terephthalate of the central layer 11a is 50 μm, the thickness of the adhesive layer 11c disposed so as to surround the periphery thereof is 3 μm, and the blank located around the adhesive layer 11c The coating layer 11b having the same thermal adhesion as the innermost surface layer of No. 10 was 10 μm low-density polyethylene. As shown in FIG. 8 (b), the other end 10b of the outer surface of the blank 10 and the inner surface of the one end 10a of the blank 10 including the tape material 11 are pressed, pressed and bonded, as shown in FIG. Lumber 11
To obtain a liquid paper container P stuck so as to cover the end face 9 of the blank 10.

[Comparative Example 3] Without using the tape material 11, as shown in FIG. 8 (c), the blank 10 was pressed against the inner surface of the bonded portion by a frame seal, and the liquid paper container was pressed and bonded. Obtained.

[Comparative Example 4] A biaxially stretched polyethylene terephthalate film 131 (12 µm) was used as a base material layer, and a polyurethane two-component curable adhesive 133 was provided on both sides.
Then, low-density polyethylene 132 (30 μm) was provided by extrusion lamination, and slit to 8 mm to obtain a tape material 130. The surface of the obtained tape material and the surface of the innermost layer at the end of the blank were heated, and the tape was stuck to the end 10a of the blank 10 to a width of 4 mm. The material 130 was bonded. This tape material 130
In the same manner as in Example 2 using the blank 10 on which the tape material 1 was adhered, as shown in FIG.
A liquid paper container P stuck in a shape to cover the paper end surface of the inner surface of the frame seal portion was obtained.

The liquid paper container obtained as described above was filled with 1000 ml of water-whiskey whiskey (9% alcohol content) and stored for one month in a room at 40 ° C. and 25% humidity, and A taste sensory test was performed by comparing the contents for comparison after storage in a glass bottle at 40 ° C. and a humidity of 25% for one month. Also, 6 meters from the concrete ground
From a height of 0 cm, the liquid paper container P shown in FIG. 1 (a) is repeatedly dropped freely while the bottom surface is horizontal with the ground, and the number of drops to a bag break is measured to measure the drop impact resistance. Was carried out. Table 2 shows the results.

[Table 2]

[Results] As is clear from Table 2, in the liquid paper container using the tape material 130 having the structure using the adhesive 133, the adhesive component is eluted from the end face of the tape material 130 and the content is reduced. The taste of the contents is clearly deteriorated due to the transfer of the adhesive odor. On the other hand, in the liquid paper container according to the second and third embodiments of the present invention,
As is clear from the structure of the above, there is no elution of the adhesive component and no transfer of the adhesive odor to the contents, and a good taste is maintained.

Example 4 Example 4 and Comparative Examples 5-7
Corresponds to the third embodiment. Blank 1
0, the body sticking sleeve S manufactured through the manufacturing apparatus 20 configured according to the present invention is attached to the bonding portions 10a, 1
At 0b, no pinhole was observed. Furthermore, it was confirmed that the amount of paper dust was also significantly reduced.
Thereafter, top and bottom sealing were performed, but no problems with moldability such as poor sealing were confirmed.

Comparative Example 5 A blank sticking sleeve was manufactured using a blank 10 by a conventionally used skive hemming machine. No pinholes were observed at the bonded portion of the body sticking sleeve. On the other hand, a large amount of paper dust is generated, and it is difficult to collect them with a vacuum cleaner or the like, and there remains a problem in hygiene. Thereafter, top and bottom sealing were performed, but no problems with moldability such as poor sealing were confirmed.

[Comparative Example 6] Using the blank 10, a body sticking sleeve was produced by a conventionally used hemming machine. No pinholes were observed at the bonded portion of the body sticking sleeve. Also, it was confirmed that almost no paper powder was generated. Thereafter, top and bottom seals were performed, but many sealing defects and the like were confirmed at the bonded portions, and there was a problem in moldability.

[Comparative Example 7] No pinholes were observed in the bonded portion of the blank produced by the brick molding machine (tape pasting machine). Paper powder was hardly generated. Thereafter, top and bottom sealing were performed, but no problems with moldability such as poor sealing were confirmed. Productivity has dropped significantly.

Next, according to Table 3, Example 4 and Comparative Example 5-7 were used.
Will be described in detail.

[Table 3]

[0112]

As described above, according to the present invention, it is possible to easily and easily provide a tape material for covering the end faces exposed at the pair of bonding ends of the blank constituting the liquid paper container.

[Brief description of the drawings]

FIG. 1 is a view showing a liquid paper container and a blank according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a liquid paper container.

FIG. 3 is a perspective view showing a tape member.

FIG. 4 is a plan view showing a tape material adhered to a blank.

FIG. 5 is a diagram showing a tape material heated by a heating device.

FIG. 6 is a sectional view of a tape material according to a second embodiment of the present invention.

FIG. 7 is a side sectional view showing a blank.

FIG. 8 is a diagram showing a tape material adhered to a blank.

FIG. 9 is a view showing an apparatus for manufacturing a body sticking sleeve according to a third embodiment of the present invention.

FIG. 10 is a diagram showing a blank carried by a blank carrying device.

FIG. 11 is a diagram showing a tape material extruded by an extrusion molding apparatus.

FIG. 12 is a diagram showing a cooling device for cooling a tape material.

FIG. 13 is an enlarged view of a cooling device.

FIG. 14 is a side view showing a cutting device for cutting a tape material.

FIG. 15 is a plan view showing a cutting device for cutting a tape material.

FIG. 16 is a side view showing a heating device for heating a blank bonding portion and a tape material.

FIG. 17 is a plan view showing a heating device for heating a blank bonding portion and a tape material.

FIG. 18 is a view showing a sleeve forming apparatus.

FIG. 19 is a view showing a body sticking sleeve.

[Explanation of symbols]

 1, 2, 3, 4, 5 Panel 6 Paper layer 7, 8 Thermoplastic resin layer 9 Blank end face 10 Blank 11 Tape material 11a Central layer 11b Coating layer 11c Adhesive layer 20 Body sticking sleeve 21 Blank transport device 22 Transport belt 23 Extrusion Forming device 24 Positioning roll 25 Blank feeder 30 Cooling device 31 Receiving roll 32 Cooling forming roll 33 Depression 50 Cutting device 51 Suction roll 52 Cutting roll 53 Cutting blade 60 Dryer 70 Sleeve forming device 71 Receiving table 72 Pressure belt P Liquid paper container F Heating Equipment S Body sticking sleeve

Claims (31)

[Claims] 1. A blank having a pair of opposing bonding ends that are folded and bonded to each other, and an extruded strip-shaped covering material provided at the pair of bonding ends. A torso sleeve characterized by the following. 2. The body sticking sleeve according to claim 1, wherein the covering material comprises a central layer and a covering layer covering the central layer. 3. The sleeve according to claim 1, wherein the covering material comprises a single layer. 4. The coating material has a width of 0.6 mm to 28 mm, and the height of the one end of the coating material from the upper surface is 0.05 mm.
2. The body sticking sleeve according to claim 1, wherein the height is from 0.4 mm to 1.0 mm from the upper surface of the other bonding end of the coating material. 5. The sleeve according to claim 2, wherein the covering material is formed by co-extrusion of the center layer and the covering layer. 6. The sleeve according to claim 5, wherein the covering material has an adhesive layer between the center layer and the covering layer. 7. The center layer of the coating material is selected from medium density polyethylene, high density polyethylene, polyethylene terephthalate resin, polyacrylonitrile, saponified ethylene / vinyl acetate copolymer, polyvinylidene chloride, acrylic resin, and nylon. The body sticking sleeve according to claim 5 or 6, wherein: 8. The Olsen stiffness of the resin constituting the center layer of the coating material (by the measuring method described in ASTM D747)
The body sticking sleeve according to any one of claims 5 to 7, wherein the weight is 2000 kg / cm ² or more and 30000 kg / cm ² or less. 9. The hardness (A) of the resin constituting the central layer of the coating material.
9) (measured by the measuring method described in STM D2240) is 30 or more and 100 or less.
The body sticking sleeve according to any one of the above. 10. The vicat softening point of the resin forming the center layer of the coating material (according to the measuring method described in ASTM D1525) is 80 ° C. or more and 300 ° C. or less. Or body sticking sleeve described. 11. The melting point of the resin constituting the center layer of the coating material (according to the measuring method described in ASTM D2117) is 1
The body sticking sleeve according to any one of claims 5 to 10, wherein the temperature is from 00C to 400C. 12. A step of preparing a blank having a pair of bonded ends and having a heat seal layer on both sides, a step of providing a strip-shaped coating material on one bonded end of the blank by extrusion molding, Folding a pair of bonded ends, and welding a coating material to the other bonded end. 13. The step of providing a coating material includes the steps of: adhering a strip-shaped coating material obtained by continuous press molding to one of the bonding ends; and cutting both ends of the strip-shaped coating material. The method for manufacturing a body-attached sleeve according to claim 12, comprising: 14. The step of providing a coating material includes a step of preheating one of the bonding ends of the blank before bonding the strip-shaped coating material to one of the bonding ends of the blank. 14. The method for manufacturing a body pasting sleeve according to claim 13. 15. The method according to claim 13, wherein the step of providing the covering material includes a step of cooling the covering material after adhering the band-shaped covering material to one bonding end of the blank. The method of manufacturing the sleeve. 16. The method according to claim 15, wherein when the coating material is cooled, the coating material is simultaneously formed into a predetermined shape. 17. The step of bonding the covering material is characterized in that the covering material is provided so as to protrude from one of the bonding ends by 0.5 to 20 mm in a direction perpendicular to the longitudinal direction of the covering material. 14. The method for manufacturing a body pasting sleeve according to claim 13. 18. The step of cutting the covering material is such that both ends of the covering material are 0 to 8 m from the one bonded end in the longitudinal direction of the covering material.
The method according to claim 13, wherein the covering material is cut so as to protrude by m. 19. The method according to claim 12, further comprising the step of simultaneously heating one of the bonding ends and the covering material before folding the blank. 20. The method according to claim 19, wherein, when simultaneously heating the one bonded end and the covering material, the outer surface of the one bonded end is heated. 21. The body sticking sleeve according to claim 20, wherein, when the pair of sticking ends are stuck together, the outer surface of one stuck end and the inner surface of the other stuck end are stuck together. Manufacturing method. 22. A blank transport device for transporting a blank having a pair of bonded edges and having a heat seal layer on both sides, and a strip-shaped coating on one bonded edge of the blank transported by the blank transport device. An extrusion molding device for extruding and bonding materials, and a blank provided at the downstream side of the extrusion molding device, folding the blank, bonding one pair of bonding ends of the folded blank, and bonding the coating material to the other. A sleeve forming apparatus for forming a body pasting sleeve by welding to a joining end, and a sleeve pasting sleeve manufacturing apparatus, comprising: 23. The apparatus according to claim 22, further comprising a cutting device provided on the downstream side of the extrusion molding device, for cutting both ends of the band-shaped coating material adhered to one of the bonding ends.
An apparatus for manufacturing a body-attached sleeve as described in the above. 24. The method according to claim 23, wherein the cutting device includes a suction roll for sucking the coating material, and a cutting roll disposed opposite to the suction roll and having a cutting blade. apparatus. 25. The apparatus according to claim 2, further comprising a cooling device provided between the extrusion molding device and the cutting device, for cooling the band-shaped covering portion adhered to one of the bonding ends.
3. The apparatus for producing a body-attached sleeve according to 3. 26. The apparatus according to claim 25, wherein the cooling device comprises a receiving roll and a cooling forming roll having a concave portion for holding the coating material between the receiving roll. 27. The apparatus according to claim 22, further comprising a preheating device provided upstream of the extrusion molding device for preheating one of the bonding ends. 28. The apparatus according to claim 22, further comprising a heating device provided between the extrusion molding device and the sleeve molding device, wherein the heating device simultaneously heats one of the bonding ends and the coating material.
An apparatus for manufacturing a body-attached sleeve as described in the above. 29. The body sticking apparatus according to claim 22, wherein the sleeve forming apparatus has a receiving tray for receiving the folded blank, and a pressure belt for pressing the blank and the covering material between the receiving tray and the receiving tray. Sleeve manufacturing equipment. 30. The blank conveying device according to claim 22, wherein the blank conveying device has a side plate guide and a plurality of positioning rolls provided to be inclined so as to press the blank against the side plate guide along the side plate guide. Manufacturing equipment for body sticking sleeves. 31. A blank having a pair of opposing bonded ends folded and bonded to each other, and a strip-shaped covering material provided at the pair of bonded ends and extruded. A liquid paper container characterized by the above-mentioned.