JP2014148347A - Paper container for liquid and filling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container for a liquid in which occurrence of a sealing defect in an encapsulation seal is prevented by preventing the liquid of a content from being splashed back and jumping out to the outside when being filled with the content of the liquid, and a filling method thereof.SOLUTION: In a paper container for a liquid, the bottom face thereof has a slope. The bottom face has an arcuate cross section protruding upward, and the slope is a part of the arcuate cross section. The paper container is formed of a tubular body member 10, a top member 20 and a bottom member 30. A bottom face formed by the bottom member has an arcuate cross section protruding upward and in the top member, a filling port (opening 22) is provided at a position deviated from the center of the top member. A content charging nozzle 400 is then positioned at an upper side of the slope of the bottom face, and the paper container is filled with the content by discharging the content from the charging nozzle to the slope.

Description

  The present invention relates to a liquid paper container and a filling method thereof.

  Various liquid paper containers used for the liquid contents of food and non-food are widely used for liquid drinks and foods such as fruit juice drinks, juice, tea, coffee, milk drinks, soup, and alcoholic beverages such as Japanese sake and shochu. It is used. Various types of filling nozzles have already been proposed for filling nozzles for filling liquids in such containers (for example, Patent Document 1).

  By the way, when such a liquid paper container is filled with liquid, the container may become dirty due to the splashing of the liquid, and a sealing failure may occur due to the contamination when the container is subsequently sealed. In order to suppress this jumping up, it is conceivable that the speed of filling is slowed down to prevent this, but doing so is unfavorable because it takes time for filling and affects production efficiency.

  As a liquid storage container of an injection hollow molded product made of thermoplastic synthetic resin that eliminates the splashing of the liquid, the liquid storage container includes a main body portion that stores liquid and a cylindrical spout integrally molded with the main body portion. There is a liquid storage container provided with a protrusion formed around the boundary of the inner peripheral surface of the inner peripheral surface with a direction substantially perpendicular to the protruding direction of the spout (Patent Document 2).

  In this liquid container, even if the liquid bounced off at the bottom of the liquid container reaches the lower end surface of the ridge vigorously along the inner wall of the main body, the liquid is liquid by the ridge protruding to the side of the inner wall. It hits the inner wall facing the container and falls. For this reason, it does not jump out of the container, and the liquid does not contaminate the main body or the work site environment.

  However, in a liquid paper container, it is difficult to provide such protrusions on the inner surface of the container both in terms of manufacturing and the mechanism of the box filling and sealing machine.

  Known documents are shown below.

Japanese Utility Model Publication No. 3-126899 Japanese Patent Laid-Open No. 10-315308

  The present invention provides a liquid paper container that can prevent the liquid in the contents from splashing and jumping out when the liquid contents are filled, and a method for filling the liquid paper container that does not cause a sealing failure with a hermetic seal. This is the issue.

  The present invention has been made in view of such problems, and the invention according to claim 1 is a liquid paper container characterized in that the bottom surface has an inclined surface.

  The liquid paper container of the present invention discharges and fills the liquid contents from the filling nozzle so as to hit the inclined surface of the bottom surface, so that the filled liquid does not rebound, thereby resulting in poor sealing with a hermetic seal. There is no waking.

  The invention according to claim 2 of the present invention is the liquid paper container according to claim 1, wherein the bottom surface has an upwardly convex cross-sectional arc shape, and the inclined surface is a part of the cross-sectional arc shape. is there.

  In the liquid paper container of the present invention, in the invention of claim 1, since the bottom surface is curved in an upwardly convex cross-sectional arc shape and the inclined surface is provided, the strain at the time of providing the inclined surface is reduced and the bottom surface is formed. Cracking of the laminated material based on paper can be prevented.

  Invention of Claim 3 of this invention consists of a cylindrical trunk | drum member, a top member, and a bottom member, The bottom face which the said bottom member forms is a cross-sectional arc shape convex upwards, In the said top member, The liquid paper container is characterized in that a filling port is provided at a position off the center.

  The liquid paper container of the present invention includes a cylindrical body member, a top member, and a bottom member, and a bottom surface formed by the bottom member has an upwardly convex cross-sectional arc shape and is located at a position off the center of the top member. Since the filling port is provided, when filling the liquid content, the liquid content discharged from the filling nozzle hits a large portion of the bottom section of the circular arc shape and the filled liquid does not rebound. , It will not cause a sealing failure in hermetic seal.

  According to a fourth aspect of the present invention, a filling nozzle for contents is positioned above the inclined surface of the bottom surface of the liquid paper container according to any one of the first to third aspects, and the filling is performed on the inclined surface. The liquid paper container filling method is characterized in that the contents are discharged and filled from a nozzle.

  According to the liquid paper container filling method of the present invention, the content filling nozzle is positioned above the inclined surface of the bottom surface, and the content is discharged and filled from the filling nozzle onto the inclined surface. The filled liquid does not bounce off the filled liquid, thereby preventing a sealing failure at the hermetic seal.

  The liquid paper container of the present invention can prevent the liquid from rebounding when the liquid content is filled, and does not cause a sealing failure with a hermetic seal.

It is explanatory drawing which showed typically an example of the liquid paper container of this invention by the perspective view. It is explanatory drawing which showed typically an example of the liquid paper container of this invention with the longitudinal cross-section. It is explanatory drawing which showed typically a mode that the bottom face of an example of the liquid paper container of this invention was deform | transformed with the longitudinal cross-section. It is explanatory drawing which showed typically a mode that the example of the liquid paper container of this invention was filled with the content in the longitudinal cross-section.

Hereinafter, modes for carrying out the present invention will be described.
FIG. 1 is an explanatory diagram schematically showing an example of a liquid paper container of the present invention in a longitudinal section.

  The liquid paper container of this example includes a container body 100 and a tab material 200 as shown in FIG. The container body 100 is provided with a body member 10, a top member 20 at an upper end portion thereof, and a bottom member 30 at a lower end portion thereof.

  The body member 10 is sealed by overlapping both ends, and is wound in a cylindrical shape. The top member 20 has an upper bent portion 21 whose peripheral portion is bent upward, is inserted into the upper end portion of the trunk member 10, and the upper end of the trunk member 10 is folded inward to provide the upper end folded portion 11. The upper bent portion 21 of the top member 20 is covered and sealed.

  The bottom member 30 has a lower bent portion 31 whose peripheral portion is bent downward, is inserted into the lower end portion of the trunk member 10, and is folded back at the lower end of the trunk member 10 to provide the lower end folded portion 12. The bottom bent portion 31 of the bottom member 30 is covered and sealed. The bottom member 30 is formed in an upwardly convex cross-sectional arc shape, and forms an upwardly convex cross-sectional arc-shaped bottom surface.

  The top member 20 is provided with an opening 22 serving as a drinking mouth at a position deviated from the center biased toward the peripheral edge. The tab member 200 is point-sealed to the top member 20 and is bent upward.

  The opening 22 serving as a drinking mouth is also a filling port when filling the liquid of the contents, and after filling the liquid of the contents from the opening 22, this bent part is stretched flat and sealed, The opening 22 can be covered and sealed.

  Hereinafter, the material of the body member 10, the top member 20, the bottom member 30, and the tab material 200 constituting the container body 100 will be described.

  Each of the body member 10, the top member 20, and the bottom member 30 is made of a laminated material in which a paper layer is mainly used and a heat sealable resin layer is provided on the front and back surfaces thereof. If necessary, a barrier layer can be provided between the paper layer and the front and back heat-sealable resin layers.

Paperboard is used for the paper layer. Particularly preferably, a milk carton base paper is used. The basis weight is 140 to 400 g / m ² .

  As the barrier layer, a vapor deposition film of an inorganic compound or metal, or a resin film having a high gas barrier property is used.

  As the resin for the vapor deposition base film of the vapor deposition film, polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, polyamides such as nylon-6 and nylon-66, polycarbonate, polyacrylonitrile Polyimide, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyether sulfone and the like can be used.

  Of these, polyester films and polyamide films are preferred from the viewpoints of heat resistance, strength, suitability for vapor deposition, and the like. Moreover, although the thickness of these films is not specifically limited, The thickness of 6-25 micrometers is preferable.

  As the inorganic compound to be deposited, aluminum oxide, silicon oxide, tin oxide, magnesium oxide, or a mixture thereof can be used. Moreover, aluminum, tin, etc. can be used as a metal to vapor-deposit.

  The vapor deposition base film of the vapor deposition film may be provided with a vapor deposition anchor layer by applying a vapor deposition anchor coating agent in order to improve adhesion to an inorganic compound or metal to be vapor deposited. Moreover, you may provide a protective layer in the outer surface of the vapor deposition layer which vapor-deposited. A protective layer may be provided by applying a mixed solution of a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof.

  As the resin film having a high gas barrier property, a biaxially stretched film of a resin such as MXD-nylon, polyvinyl alcohol, or ethylene-vinyl alcohol copolymer can be used.

  For the heat-sealable resin layers on the front and back sides, polyethylene such as low-density polyethylene or linear low-density polyethylene, or unstretched film of polypropylene can be used.

  Furthermore, a layer such as another base film layer can be provided between the heat-sealable resin layers on the front and back sides. As the base film layer, for example, stretched or unstretched films such as polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polyamides such as nylon-6, nylon-66, and MXD nylon can be preferably used.

  The laminated material which comprises the tab material 200 consists of a surface base material and an easy peel resin layer. Moreover, a barrier layer can be provided as needed. For example, it is good also as a layer structure which laminated | stacked the paper layer, the barrier layer, and the easy peel resin layer one by one on the surface base film using the surface base film as a surface base material.

  As the front substrate film, a film of a resin such as polyolefin such as polypropylene, polyester such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyamide such as nylon-6, nylon-66, and MXD nylon can be used.

For the paper layer, paper of about 40 to 100 g / m ² is used instead of paperboard. For the barrier layer, a vapor deposition film of an inorganic compound or metal similar to the barrier layer used for the body member 10, the top member 20, and the bottom member 30, or a resin film having a high gas barrier property is used.

  For the easy peel resin layer, a resin that can be heat-sealed so as to be peelable from the heat-sealable resin layer on the front side of the top member 20 is used. It may be provided by being extruded as a molten resin by an extrusion lamination method, or may be provided by laminating a film formed in advance using a polyester two-component curable adhesive or the like by a dry lamination method.

  The resin used for the easy peel resin layer is a mixed resin containing the same type of resin as that of the heat-sealable resin layer on the front side of the top member 20, for example, a resin of the heat-sealable resin layer on the front side of the top member 20. If polyethylene is polyethylene, it can be selected from mixed resins with other polyolefins using polyethylene as one component.

  Alternatively, a copolymer having the same monomer as the resin of the heat-sealable resin layer on the front side of the top member 20 as a component, for example, if the resin of the heat-sealable resin layer is polyethylene, the copolymer of ethylene and propylene Coalescence etc. can be used.

  Hereinafter, the manufacturing method of the liquid paper container of this example will be described.

  To manufacture a liquid paper container, first, the body member 10 is wound into a cylindrical shape, both ends are overlapped, heated by hot air, and the heat-sealable resin layers that overlap each other are melted and pressed to form a cylindrical shape. To.

Next, the upper bent portion 21 is provided by bending the peripheral portion of the top member 20 upward. The top member 20 is inserted into the upper end portion of the cylindrical body member 10, the upper bent portion 21 of the top member 20 and the upper end portion of the body member 10 are heated with hot air, and each heat-sealable resin layer is melted. The upper end of the body member 10 is folded inward to provide the upper end folded portion 11, covers the upper bent portion 21 of the top member 20, and is crimped and heat sealed.

  Similarly, the peripheral part of the bottom member 30 is bent downward to provide the lower bent part 31. At this time, the center portion of the bottom member 30 may be deformed by pressing to form a bottom surface having a convex cross-sectional arc shape.

  Then, the bottom member 30 is inserted into the lower end portion of the body member 10, the lower bent portion 31 of the bottom member 30 and the lower end portion of the body member 10 are heated with hot air, and each heat-sealable resin layer is melted, The lower end of the body member 10 is folded inward, the lower end folded portion 12 is provided, the lower bent portion 31 of the bottom member 30 is covered, crimped, and heat sealed. Thereby, the container main body 100 is manufactured.

  Then, the bent tab material 200 is attached to the top member 20 of the container body 100 by a point seal or the like as shown in FIG.

  When the lower bent portion 31 of the bottom member 30 is formed, if the upper portion of the bottom member 30 is not provided with a convex arcuate cross-section, the bottom member 30 is shaped like a tip as shown in FIG. The pusher 300 having an arcuate cross section is pushed up from below to deform the bottom member 30 so that the bottom surface has an arcuate cross section convex upward. Thereby, the liquid paper container of this example is manufactured.

  Hereinafter, the filling and sealing method for the liquid paper container of this example will be described.

  In the filling section of the filling and sealing machine for filling the liquid in the liquid paper container of this example, the opening 22 of the top member 20 of the liquid paper container is positioned below the filling nozzle 400 that discharges the liquid in the content. Move to stop.

  Next, the filling nozzle 400 descends downward, and the tip of the filling nozzle 400 enters the container body 100 through the opening 22 as shown in FIG. Then, the content liquid is discharged downward from the filling nozzle 400. The liquid of the discharged contents is filled so as to hit the bottom surface formed by the bottom member 30.

  The bottom member 30 is formed in an upward convex cross-sectional arc shape, and forms an upward convex cross-sectional arc-shaped bottom surface. Although the center portion of the bottom surface is substantially flat, the filling nozzle 400 is off the center of the bottom surface because the opening 22 of the top member 20 is provided at a position deviating from the center biased toward the peripheral edge. The contents are discharged toward the inclined surface.

  Therefore, the liquid in the contents splashes in an oblique lateral direction without splashing upward, so that the liquid to be filled does not reach the opening 22 and, moreover, turns to the outside of the opening 22 to seal the tab material 200. It does not adhere to the part to be sealed, and there is no possibility that a sealing failure will occur.

  The liquid paper container filled with the liquid of the contents moves to the hermetic seal section of the filling and sealing machine, and the folds of the tab material 200 are stretched flat so that the tab material 200 covers the opening 22 and the opening The opening 22 is sealed by heat-sealing the periphery of the end portion 22, the filling seal is finished, and a liquid paper container filled with contents is produced.

DESCRIPTION OF SYMBOLS 100 ... Container main body 200 ... Tab material 10 ... Body member 11 ... Upper end folding part 12 ... Lower end folding part 20 ... Top member 21 ... Upper folding part 22 ... Opening 30 ... Bottom member 31 ... Downward bending part 300 ... Pusher 400 ... Filling nozzle

Claims (4)

  A liquid paper container characterized in that the bottom surface has an inclined surface.   2. The liquid paper container according to claim 1, wherein the bottom surface has an upwardly convex cross-sectional arc shape, and the inclined surface is a part of the cross-sectional arc shape.   It consists of a cylindrical body member, a top member, and a bottom member, and the bottom surface formed by the bottom member has an upwardly convex cross-sectional arc shape, and the top member has a filling port at a position off its center. A liquid paper container characterized by being provided.   A filling nozzle for contents is positioned above the inclined surface of the bottom surface of the liquid paper container according to any one of claims 1 to 3, and the contents are discharged from the filling nozzle to fill the inclined surface. A filling method for a liquid paper container.

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