JP2011230818A - Hermetic container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic plastic container including a container body and a sealing lid which is unbreakable by factors such as an internal force and an external force, and is easily peelable.SOLUTION: The plastic container includes the plastic container body and the three-dimensional plastic lid formed by injection molding and hermetically sealing the body. In sealing the container body, an easily peelable sealant layer is arranged on a rear face of the lid.

Description

  The present invention relates to a sealed container composed of a container body and a lid, and more particularly to a plastic container capable of ensuring the quality of contents and capable of easy peeling when opened.

  Conventionally, plastic containers containing various beverages such as coffee and tea, dessert foods such as jelly and pudding, side dish foods such as oden, and solid foods are distributed by methods such as freezing, chilled, and room temperature. Saved.

  The container is generally sealed by a method of heat-sealing a plastic film (seal lid) at the opening of the container body. The seal lid needs to protect the contents and easily peel the seal lid when opened.

  However, these seal lids may be damaged by receiving some external force during the distribution of the product, or may be damaged by the force from the inside if the content is rich in solids. As a countermeasure against these, an overcap is further provided on the seal lid. It protects against external forces and protects the contents from being scattered with a cap. However, this method has a drawback that it takes time and effort to remove the overcap and peel the seal lid.

  According to Patent Document 1, as in the case of a full-open type lid in which a plastic lid is employed in a metal can, the junction between the container body and the lid is not separated and opened, but the lid is weakened. Proposals have been made to open it by cutting the part.

Japanese Patent No. 3079642

  The present invention provides a sealed container having a sealing property composed of a container body and a lid, which is a sealed lid that is not damaged by an external force or a factor from an internal force, and has a lid that can be easily peeled. is there.

  The invention according to claim 1 of the present invention is characterized in that in the sealed container in which the container body and the lid are hermetically sealed, the lid is injection-molded, and an easy peel sealant layer is provided on the hermetically sealed surface of the lid. It is a sealed container.

  In the invention according to claim 2 of the present invention, a composite film comprising at least an adhesive layer / base material layer / easy peel sealant layer is heat-sealed to the hermetic seal surface through the adhesive layer by injection molding. The sealed container according to claim 1, wherein the sealed container is a sealed container.

  The invention according to claim 3 of the present invention is the sealed container according to claim 2, wherein the injection molding is insert injection molding.

The invention according to claim 4 of the present invention is the sealed container according to claim 1, wherein an easy peel resin is provided on the hermetic seal surface and an easy peel sealant layer is provided by injection molding.

  The invention according to claim 5 of the present invention is the sealed container according to any one of claims 1 to 4, wherein the container body and the lid are integrally formed through a hinge. .

  The present invention is a sealed container in which a container body and a lid are hermetically sealed. The lid is injection-molded, and an easy peel layer is provided on a hermetic seal surface of the lid. That is, it is possible to eliminate damage from external force and internal force by creating a lid by injection molding instead of a plastic film. Moreover, an easy peel can be achieved by providing an easy peel sealant layer on the hermetic seal surface of the lid, that is, the back surface of the lid.

  As a method of providing an easy peel sealant layer on the back surface of the lid, there are a method of insert molding the composite film, and a method of partially forming an easy peel resin by injection molding, and any method can be used.

It is explanatory drawing which shows an example of the sealed container of this invention. It is explanatory drawing which shows an example of the composite film which has the easy peel sealant layer of this invention. It is explanatory drawing which shows an example of the lid | cover which heat-sealed the composite film which has an easy peel sealant layer of this invention. It is explanatory drawing which shows an example of the lid | cover which the easy peel sealant layer of this invention has in a pattern shape. It is sectional drawing which shows an example of the state which opened the lid | cover of the sealed container which integrally formed the container main body and the lid | cover of this invention via the hinge. It is sectional drawing which shows an example of the state which closed the lid | cover of the sealed container which integrally formed the container main body and lid | cover of this invention via the hinge. It is sectional drawing of the sealed container which showed an example of the state which closed the cover of the sealed container which integrally formed the container main body and the cover of this invention via the hinge, and provided the easy peel sealant layer with the pattern.

  Below, the form for implementing this invention is demonstrated concretely.

  The sealed container 1 including the container body 2 and the lid 3 is a sealed container having an easy peel sealant layer on the back surface of the lid. As shown in FIG. 1, a composite film having an easy peel sealant layer is provided on the back surface of the lid. A sealed container can be formed by heat sealing or high frequency sealing with the container body.

  FIG. 2 is an explanatory view showing an example of a composite film having the easy peel sealant layer of the present invention. It is the composite film 4 which has an easy peel sealant layer. At least the front and back of the base material layer 6, that is, the adhesive layer 5 that adheres to the lid on one side of the base material layer, and the easy peel sealant layer 7 that hermetically seals the container body on one side.

  The role of this base layer is to increase the waist strength of the film, such as polyethylene terephthalate film, polypropylene film, polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, etc. A film or sheet made of the above resin can be used. An unstretched film, a uniaxially stretched film or a biaxially stretched film can be used. The thickness of the film used for the base material layer can be in the range of 4 to 100 μm.

  In addition, when it is necessary to impart transparency and gas barrier properties, a film having a deposited film of an inorganic oxide such as silicon oxide and aluminum oxide on a polyethylene terephthalate film, when light shielding properties and gas barrier properties need to be imparted, When providing barrier properties such as aluminum foil or vapor-deposited film, water vapor, water, etc., low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, etc. A resin film or sheet can be used. The film and metal foil can be used in combination depending on the required level of barrier properties such as gas and water vapor, and light shielding properties.

  As the adhesive layer, a resin similar to the polyolefin resin forming the lid may be used, and a film is formed by an extrusion method. Further, the adhesive layer may be formed by dispersing these resins in a solvent and coating them.

  As the material for forming the easy peel sealant layer, for example, when the material of the container body is polyethylene or polypropylene, polyolefin resin such as polyethylene resin, high density polyethylene, linear low density polyethylene resin, polypropylene diresin and polybutene resin are used. Mixed resin materials can be used. Moreover, the resin material etc. which mixed polyolefin resin and polystyrene resin can be used.

  Further, the mixing ratio of the polyolefin resin and the polybutene resin and the mixing ratio of the polyolefin resin and the polystyrene resin may be appropriately determined in accordance with the required seal strength and easy peel property.

  As the easy peel sealant layer, a film formed by extrusion of an easy peel resin can be used. The easy peel sealant layer may be formed by dispersing an easy peel resin in a solvent and coating the base material.

  The composite film can be produced by an extrusion method. Each film of the adhesive layer and sealant layer prepared in advance can be prepared by laminating the base material layer with an adhesive. As another method, a resin for forming an adhesive layer on the base material layer and an easy peel resin for forming an easy peel sealant layer can be formed by sticking together via an anchor agent while forming a film by an extrusion method. . The thickness of the adhesive layer may be 15 μm or more. Further, the thickness of the sealant layer may be 15 μm or more from the viewpoint of seal strength and easy peel property. The thicknesses of the adhesive layer and the sealant layer may be appropriately determined according to the required level.

  As a method for creating an easy peel sealant layer on the back surface of the lid, there is an insert injection molding method. The insert injection molding method uses an injection mold having a gate position at the center of a female lid forming cavity mold. First, the injection mold on the injection molding machine is opened and created in advance. Temporarily fixing the composite film 4 to the adhesive layer 5 of the composite film 4 and the resin forming the lid 3 on the surface of the male core mold, and then clamping the molten resin forming the lid from the gate to the cavity mold Injection is performed between the mold and the male core mold (the space between the male mold and the female mold in which the molded product is molded), and the composite film is molded on the back surface of the lid. An inserter is used to insert the composite film into the mold.

  FIG. 3 is an explanatory view showing an example of a lid in which a composite film having an easy peel sealant layer is heat-sealed. The composite film is inserted into a mold for injection-molding a lid, insert-molded on the back surface of the lid, and heat-welded. The sealant layer is on the entire surface.

  As the resin used to create the lid 3, an olefin resin such as polyethylene or polypropylene can be used. Molded by injection molding. By setting the thickness of the lid to 0.2 mm to 0.5 mm, it is possible to eliminate damage from external force and from internal force. The thickness of the lid may be appropriately determined according to the required level.

  As the resin used for producing the container body 2, olefin resins such as high density polyethylene, medium density polyethylene, low density polyethylene, and polypropylene resin can be used.

  The container body can be formed into a cup, tray shape or the like by an injection molding method. Also, vacuum forming is possible.

  Moreover, it can also create using the 2 color injection molding method as a method of creating an easy peel sealant layer on the back surface of the lid. By using this method, an easy peel sealant layer can be formed with a pattern.

  FIG. 4 is an explanatory view showing an example of a lid in which an easy peel sealant layer is formed in a pattern in accordance with a seal portion with the container body.

  The two-color injection molding method uses a two-color injection molding machine equipped with two sets of injection devices to create a primary molded body made of an easy peel resin using an injection mold, and then covers the primary molded body with a lid. In this method, the material is moved into the material molding die to mold the lid material, and at the same time, the primary molded body and the back surface of the lid are heat-sealed to form an easy peel sealant layer on the back surface of the lid.

  In this two-color injection molding method, a primary molded body made of an easy peel resin can be prepared according to the shape of the heat seal portion of the opening of the container body.

  As the easy peel resin, a resin material in which a polyolefin resin such as a polyethylene resin, a high density polyethylene, a linear low density polyethylene resin, or a polypropylene diresin and a polybutene resin are mixed can be used. A resin material obtained by mixing a polyolefin resin and a polystyrene resin can also be used. These resins are expensive compared to general-purpose resins commonly used for lids such as polyethylene resin, polypropylene resin, polyethylene terephthalate resin, and polystyrene resin. Can be reduced.

  FIG. 5 is a cross-sectional view showing an example of a state in which a lid of a sealed container in which the container body 2 and the lid 3 are integrally formed via a hinge 9 is opened. Simplification of the process can also lead to a reduction in manufacturing cost.

  FIG. 6 is a cross-sectional view showing an example of a state in which the lid of a sealed container in which the container body and the lid of the present invention are integrally formed via a hinge is closed.

  FIG. 7 is a cross-sectional view of a sealed container in which an easy peel sealant layer is provided in a pattern, showing an example of a sealed container lid in which the container body and the lid of the present invention are integrally formed via a hinge. That is, an easy peel sealant layer is provided in accordance with the opening of the container body.

  The lid thus prepared can be made into a sealed container by heat sealing or high frequency sealing the opening of the container main body and the easy peel sealant layer on the back surface of the lid.

  The lid of the present invention can be used as a container body for a plastic cup, a plastic tray, a composite cup of paper and plastic, a tray, and the like.

  The sealed container of the present invention can be used for various beverages such as coffee, dessert foods such as jelly and zenzai, side dish foods such as oden, and solid foods such as confectionery.

  Specific examples of the present invention will be described below.

  A plastic cup-shaped container body 2 as shown in FIG. 1 was prepared by injection molding using a high-density polyethylene resin.

  The composite film 4 uses a low-density polyethylene film 20 μ as the adhesive layer 5, an aluminum foil 9 μ as the base material layer 6, and a film 15 μ made of a resin in which polyethylene resin and polybutene-1 resin are mixed as the easy peel sealant layer 7. It was pasted and created via a type of urethane adhesive.

  The composite film 4 was inserted into an injection mold, and the lid 3 was injection molded. At the same time, the adhesive layer 5 was heat-sealed and bonded to create a lid having the composite film 4 on the back surface of the lid. The lid was molded using high-density polyethylene, and the thickness was 0.3 mm including the composite film.

  A lid was put on the opening of the prepared container body, and the easy peel sealant layer on the back surface of the opening of the container body and the lid was hermetically sealed using a high-frequency sealer, thereby producing a sealed container as shown in FIG.

  The prepared sealed container was excellent in sealing performance, was strong against damage from external force and internal force, and could be opened easily.

  An easy peel sealant layer was formed on the back of the lid using a two-color injection molding machine. The portion provided with the easy peel sealant layer was injection-molded in accordance with the seal portion of the container body. The resin used for the easy peel sealant layer was a resin in which a polyethylene resin and a polybutene-1 resin were mixed, and the thickness of the sealant layer was 0.10 mm. It is a lid | cover shown in FIG.

  The lid was molded using high-density polyethylene, and the thickness including the sealant layer was 0.3 mm.

  The container body prepared in the same manner as in Example 1 was covered with a lid, and the easy peel sealant layer on the back surface of the container body and the lid was hermetically sealed using a high frequency sealing machine to prepare a sealed container.

  The prepared sealed container was excellent in sealing performance, was strong against damage from external force and internal force, and could be opened easily.

  The container main body and the lid were integrally formed via a hinge to produce a cup-shaped container with a lid. In the same manner as in Example 1, the composite film 4 was inserted into a lid mold, and an easy peel sealant layer was provided.

  The cup-shaped container with a lid was prepared by injection molding using a high-density polyethylene resin. It is a cup-shaped container with a lid shown in FIG. The lid thickness was 0.3 mm including the composite film.

  The container main body was covered with a lid, and the easy peel sealant layer on the back surface of the container main body and the lid was hermetically sealed using a high frequency sealing machine to produce a sealed container shown in FIG.

  The prepared sealed container was excellent in hermetic seal, strong against damage from external force and from internal force, and easy to open.

  The container main body and the lid were integrally formed via a hinge to produce a cup-shaped container with a lid. In the same manner as in Example 2, an easy peel sealant layer was injection-molded on the back surface of the lid at a portion corresponding to the seal portion of the container body.

  The resin used for the easy peel sealant layer was a resin in which a polyethylene resin and a polybutene-1 resin were mixed, and the thickness of the sealant layer was 0.10 mm.

  The lid was molded using high-density polyethylene, and the thickness including the sealant layer was 0.3 mm.

  The prepared lid was put on the container body, and the easy peel sealant layer on the back surface of the container body and the lid was hermetically sealed using a high frequency sealing machine, and the sealed container shown in FIG. 7 was prepared.

  The prepared sealed container was excellent in sealing performance, was strong against damage from external force and internal force, and could be opened easily.

1. · Sealed container 2 ·· Container body 3 ·· Lid 4 ·· Composite film 5 ·· Adhesive layer 6 ·· Base material layer 7 · Easy peel sealant layer 8 ·· Easy peel sealant layer (pattern)
9. Hinge

Claims (5)

  A sealed container comprising a container body and a lid hermetically sealed, wherein the lid is injection-molded, and an easy peel sealant layer is provided on a hermetic seal surface of the lid.   The composite film comprising at least an adhesive layer / base material layer / easy peel sealant layer is heat-sealed to the hermetic seal surface through the adhesive layer by injection molding. The sealed container as described. The sealed container according to claim 2, wherein the injection molding is insert injection molding. 2. The sealed container according to claim 1, wherein an easy peel resin is provided on the hermetic seal surface and an easy peel sealant layer is provided by injection molding. The sealed container according to any one of claims 1 to 4, wherein the container body and the lid are integrally formed through a hinge.

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