JP2006069561A - Lid material formed of paper as base material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid material formed of a paper as a base material capable of preventing any foaming phenomenon during the heat bonding without opening any holes by releasing steam generated by heating from a paper end face. <P>SOLUTION: The lid material is formed of the paper as a base material to be heat-bonded to a material of a container or the like by the heating. The paper base material (11) has the Gurley densometric value measured in accordance with JIS P8117 of ≤15 seconds, preferably ≤10 seconds. More specifically, an oriented plastic film (12) capable of preventing permeation of gas is laminated on the outer side of the paper base material (11), and a sealant layer (13) is laminated on the inner side of the paper base material, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper-based lid material, and particularly to a paper-based lid material that prevents foaming during heat welding.

  Conventionally, when a paper base material is used for heat welding to an adherend such as a flanged container, the water in the paper evaporates to become water vapor by heating the paper at the time of welding. . At this time, since the lid member may be destroyed by the water vapor pressure, various measures have been taken to release the generated water vapor (see, for example, Patent Document 1).

The said prior art document is shown.
Japanese Patent Laid-Open No. 2001-2113.

  In this technology, many fine holes are made in the paper substrate and the polyethylene terephthalate film laminated on the outside, and many fine holes are made in the outer polyethylene terephthalate film layer. Water vapor from the source is released. This suppresses foaming of the paper layer and has good physical properties, but there are problems such as an increase in price and prolongation of the process due to drilling.

  As described above, the present invention occurs when a lid material using a laminated material in which a thermoplastic resin that does not transmit gas is laminated on the outside or inside thereof is thermally welded to a container by a thermal welding method. It was made in view of the problem, and by using the paper base material that prevents foaming at the time of heat welding without using a measure such as drilling by releasing water vapor generated by heating from the end face of the paper It is an issue to provide.

  The invention of claim 1 of the present invention is a lid member using paper that is thermally welded to a container by heating, and the paper base material is JIS P8117 “Paper and paperboard—Air permeability test method—Gurley tester” The paper-based cover material is characterized in that paper having an air permeability measured by the “method” of 15 seconds or less, preferably 10 seconds or less is used.

  As described above, according to the first aspect of the present invention, the paper substrate has an air permeability measured by JIS P8117 “Paper and paperboard—Air permeability test method—Gurley tester method” of 15 seconds or less, preferably 10 Since paper of less than a second is used, the water vapor generated from the water contained in the paper generated when the lid is thermally welded to the container uses paper with a low air permeability (well passes gas). Thus, it is possible to escape from the end surface of the paper, and it is not necessary to escape from the upper surface of the paper.

  According to a second aspect of the present invention, in the first aspect of the invention, a stretched plastic film that does not transmit gas is formed outside the paper base material, and a sealant layer is laminated inside the paper base material. This is a lid material based on paper.

  Thus, according to the second aspect of the present invention, the stretched plastic film that does not transmit gas is formed outside the paper base material, and the sealant layer is laminated inside the paper base material. By allowing water vapor to escape from the end face, the lid can be completely heat-welded to the container.

  The invention according to claim 3 is the paper substrate according to claim 1 or 2, wherein a second stretched plastic film is laminated between the paper substrate and the sealant layer. It is a lid material.

  Thus, according to the invention described in claim 3, since the second stretched plastic film is laminated between the paper base material and the sealant layer, the preservability of the contents contained in the container is enhanced.

  The invention according to claim 4 is the paper container according to claim 1, 2 or 3, wherein the paper base material is a container having an opening such as a drinking mouth, in particular, a laminated material mainly composed of paper. It is used as a tab material for sealing the opening, and is a cover material based on paper.

  As described above, since the lid material using the paper of the present invention as a base material omits the fine hole punching process, the cost can be reduced and the delivery time can be shortened.

  In addition, since there are no holes in the lid material surface, the surface becomes smooth and the cosmetics are improved.

  The present invention will be described in detail below based on one embodiment.

  The cover material based on the paper of the present invention is, for example, a cover material (10) using paper (11) that is thermally welded to a container (20) by heating, as shown in FIGS. , JIS P8117 “Paper and paperboard—Air permeability test method—Gurley tester method” has an air permeability of 15 seconds or less, preferably 10 seconds or less.

  More specifically, a stretched plastic film (12) that does not transmit gas is laminated outside the paper substrate (11), and a sealant layer (13) is laminated inside the paper substrate (11). .

  Alternatively, the second stretched plastic film (14) is laminated between the paper substrate (11) and the sealant layer (13).

The paper base material (11) serves as a base material and imparts rigidity to the lid material (10). The reason why the air permeability of the paper substrate (11) is specified to be 15 seconds or less, preferably 10 seconds or less is that, when heated at the time of sealing, the water present in the paper evaporates to become water vapor. At this time, there is a possibility that the lid member may be destroyed by the water vapor pressure.
At this time, in order to release water vapor from the end face of the paper layer, paper having a high air permeability (15 seconds or less, preferably 10 seconds or less by the Gurley method) is used.

The stretched plastic film (12) disposed on the outside of the paper substrate is provided for the purposes of water resistance, cosmetics, and prevention of curling of the lid material due to drying.
A laminate film of polyethylene terephthalate film, nylon film, polypropylene film or the like alone or in any combination can be used.

  The sealant layer (13) disposed on the inner side of the paper substrate may be made of any material as long as it can be heat-sealed. In general, a polyolefin resin such as polyethylene and polypropylene can be preferably used. Hot melt and various multi-component sealant layers can also be used.

  The second stretched plastic film (14) provided between the paper substrate (11) and the sealant layer (13) is provided for the purpose of providing strength for barrier properties or prevention of breakage, and is uniaxial to biaxial. An inorganic compound-deposited polyethylene terephthalate film, a polyethylene terephthalate film, in which a thin film of an inorganic compound such as aluminum oxide or silicon oxide is provided on a stretched polyethylene terephthalate film to a thickness of about 20 to 100 nm by a vapor deposition method such as physical vapor deposition or chemical vapor deposition. A single or any combination laminate film such as a film, a nylon film, a polypropylene film, an ethylene / vinyl alcohol copolymer resin film, and an aluminum foil can be used.

  Paper substrate (11) and stretched plastic film (12), paper substrate (11) and sealant layer (13), paper substrate (11), second stretched plastic film (14) and sealant layer (13) The lamination can be performed using a generally known laminating method such as a dry laminating method, a wet laminating method, a non-solvent laminating method, or an extrusion laminating method.

  Hereinafter, the present invention will be described in detail by way of examples.

First, a tab material test paper having a basis weight of 83 g / m ² was prepared as a paper base material (11). The tab material test paper has a Gurley air permeability of 9 seconds.

  Separately, a 12 μm-thick polyethylene terephthalate film as the stretched plastic film (12), a 35 μm-thick unstretched polypropylene film as the sealant layer (13), and a 12 μm-thick stretched film as the second stretched plastic film (14) An inorganic compound vapor-deposited polyethylene terephthalate film in which a thin film of silicon oxide was provided on a polyethylene terephthalate film to a thickness of about 60 nm was prepared.

  A polyethylene terephthalate film having a thickness of 12 μm, which is a stretched plastic film (12), was bonded to the outside of the paper substrate (11) by a dry laminating method.

On the inside of the paper substrate (11), the second stretched plastic film (14) and the sealant layer (13) are sequentially bonded together by a dry laminating method, and [outside] a polyethylene terephthalate film (thickness: 12 μm) (12) / Tab material test paper (basis weight 83 g / m ² , Gurley air permeability; 9 seconds) (11) / inorganic compound-deposited polyethylene terephthalate film (thickness 12 μm) (14) / unstretched polypropylene film (thickness 35 μm) ( 13) A lid material (10) of Example 1 having a layer configuration of [inner side] was produced.

  The lid material (10) of this Example 1 was treated at 35 ° C. and 90% RH. Was adjusted to 12.8% in a high humidity environment.

The inner surface of this lid is combined with the polyethylene surface of a substrate having a structure in which a low-density polyethylene having a thickness of 20 μm is laminated on a cup base paper having a basis weight of 295 g / m ² , and 200 ° C. × 1 second × 2 times Then, heat sealing was performed under two conditions of 220 ° C. × 1 second × 2.

  As a result, the foaming phenomenon did not occur in both conditions, and heat sealing was possible without any problem.

It is sectional explanatory drawing which shows one Example of the laminated constitution of the cover material which uses the paper of this invention as a base material. It is sectional explanatory drawing which shows another Example of the laminated constitution of the cover material which uses the paper of this invention as a base material. It is perspective explanatory drawing which shows an example of the paper container which uses the cover material which uses the paper of this invention as a base material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Lid material 11 ... Paper, paper base material 12 ... Outside, stretched plastic film 13 ... Inside, sealant layer 14 ... 2nd stretched plastic film 20 ... Container, Adhering material

Claims (4)

A cover material based on paper to be heat-welded with an adherend such as a container by heating,
As the paper substrate, paper having an air permeability measured by JIS P8117 “Paper and paperboard—Air permeability test method—Gurley tester method” of 15 seconds or less, preferably 10 seconds or less is used. Paper-based lid material.   The paper according to claim 1, wherein a stretched plastic film that does not transmit gas is laminated on the outside of the paper substrate, and a sealant layer is laminated on the inside of the paper substrate. Cover material.   The paper base cover material according to claim 1 or 2, wherein a second stretched plastic film is laminated between the paper base material and the sealant layer.   The said lid | cover material is used as a tab material which seals the said opening part of the container which has opening parts, such as a drinking mouth, The lid | cover material which uses the paper as a base material of Claim 1, 2, or 3 characterized by the above-mentioned. .

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