JP2009073523A - Heat-sealable lid material for packaging container with content adhesion preventability, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-sealable lid material to which gel-like food content is hardly adhered and which is highly adhesive to a container. <P>SOLUTION: In this heat-sealable lid material 10 for the packaging container with the content adhesion preventability, a heat-sealable layer 2 and a content nonadhesive layer 3 are interposed on a base material 1 in this order, and the composition of the content nonadhesive layer 3 is composed of wax and a filler which is dispersed in the wax. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat-sealing lid for packaging containers suitable for food-related containers such as yogurt, jelly, pudding, mousse and the like, and a method for producing the same.

JP 2002-37310 A JP 2007-153385 A

Yogurt, jelly, pudding, mousse, and the like are sold in, for example, a cylindrical container with a bottom that opens upward. In the manufacturing method of these products, the container is filled with the contents, and then the opening of the container is covered with a sheet-like lid, and the periphery of the lid is heated on the flange provided at the periphery of the opening of the container. Sealed into a product.
As such a lid material, for example, a metal foil layer such as an aluminum foil is laminated via an adhesive layer under the base film layer arranged on the front side of the lid material, and an adhesive layer is placed thereunder, Or the thing in which the heat-sealing layer which consists of polyolefins, such as polyethylene and a polypropylene, was laminated | stacked without interposing is mentioned.

Patent Document 1 discloses a cover material in which a metal foil layer, an anchor coat layer, an intermediate layer, and a heat seal layer are sequentially provided on a base material, and the heat seal layer has a non-ionic surfactant or hydrophobic property that has an adhesion preventing effect. A lid made of a polyolefin containing at least one additive is disclosed.
Patent Document 2 discloses a lid material in which a metal foil layer, an intermediate synthetic resin layer, and a heat seal layer are provided in this order on a base material, the heat seal layer containing 40 to 70% of a wax, and the heat seal material layer Has a mean surface roughness of 0.05 to 5 μm and a maximum surface roughness of 10 μm or less.

However, when the contents filled with a soft gel-like food such as yogurt, jelly, pudding, mousse, etc. come into contact with the innermost layer of the lid, there is a problem that the contents easily adhere to the lid.
Moreover, when a component having an adhesion preventing effect is added to the heat sealable layer of the lid material, these components are not sufficiently separated from the adhesive component when heat sealed, and the adhesiveness of the heat sealable layer is lowered. There was a problem.
In order to solve the above problems, the present inventors have prepared a synthetic resin hydrogen wax, a modified synthetic wax, a hydrogenated wax, a fatty acid, a fatty acid amide, a fatty acid ester, as a content adhesion preventing layer that comes into contact with the content filled in the container. Select from inorganic powder, organic powder, powder water-repellent resin, liquid water-repellent resin among one or more waxes selected from Fischer-Tropsch wax, plant wax, animal wax and petroleum wax It has been found that by using a composition formed by dispersing one or more of the above, it is difficult for the content to adhere to the content adhesion preventing layer.
It is an object of the present invention to provide a heat-sealing lid material that prevents the filled gel-like contents from adhering and has high adhesion to the container and has contents adhesion preventing properties.

  The heat-sealing lid material having content adhesion preventing property of the present invention is a heat-sealing lid material in which a heat-sealing layer and a content adhesion preventing layer are laminated on a base material in this order. The composition is characterized by comprising a wax and a filler dispersed in the wax.

  Such a heat-sealing lid, wherein the wax is a synthetic hydrocarbon wax, modified synthetic wax, hydrogenated wax, fatty acid, fatty acid amide, fatty acid ester, Fischer-Tropsch wax, plant wax, animal wax One or more waxes selected from petroleum waxes, and the filler is selected from inorganic powders, organic powders, powder water-repellent resins, and liquid water-repellent resins that are incompatible with the wax. Those which are one or more fillers are preferred.

  The method for producing a heat-sealable lid material of the present invention comprises: a wax and a filler dispersed in the wax on a heat-sealable layer of a lid material in which a heat-sealable layer is formed on a substrate via an adhesive layer; It is characterized by applying a composition comprising an agent.

  The heat-sealing lid material of the present invention is provided with a content adhesion prevention layer made of a composition in which a wax and a filler are dispersed in the wax in the innermost layer in contact with the flange of the container. Even if the contents, which are soft gelled foods such as yogurt, jelly, pudding, mousse, etc., filled in the container due to shaking or the like come into contact with the lid, the contents are less likely to adhere to the lid. Further, the main component of the content adhesion preventing layer is wax, and the content adhesion preventing layer is provided in a multilayer state separated from the heat-sealing layer, and therefore corresponds to the flange of the container of the lid material. By applying heat to the part, the content adhesion preventing layer made of wax reaching the melting point at a lower temperature than the heat-sealing layer melts and escapes from between the heat-sealing layer and the flange of the container. Therefore, the adhesiveness of the heat sealable layer is not easily lowered.

  The heat-sealing lid material of the present invention, wherein the wax is a synthetic hydrocarbon wax, a modified synthetic wax, a hydrogenated wax, a fatty acid, a fatty acid amide, a fatty acid ester, a Fischer-Tropsch wax, a plant wax, or an animal wax. One or more waxes selected from petroleum waxes, and the filler is selected from inorganic powders, organic powders, powder water-repellent resins, and liquid water-repellent resins that are incompatible with the wax. In the case of one or more fillers, the dispersed filler appears on the wax surface, and the contents are less likely to adhere.

  The method for producing a heat-sealable lid material of the present invention comprises: a wax and a filler dispersed in the wax on a heat-sealable layer of a lid material in which a heat-sealable layer is formed on a substrate via an adhesive layer; Since the composition comprising the agent is applied, a heat-sealing lid material to which the contents are difficult to adhere can be obtained.

  FIG. 1 is a cross-sectional view showing an example of a heat-sealing lid material having content adhesion preventing properties of the present invention. This heat-sealing lid material 10 is configured by laminating a base material layer 1 with a heat-sealing layer 2 and a content adhesion preventing layer 3 in order and integrating them.

  The base material layer 1 of this embodiment refers to a film layer 1a, an adhesive layer 1b, a metal foil layer 1c, an anchor coat layer 1d, and an intermediate layer 1e laminated and integrated. The intermediate layer 1e in contact with the heat-sealing layer 2 of the base material layer 1 has good adhesion to the heat-sealing layer 2 or has good adhesion to the heat-sealing layer 2 through an anchor coat layer. It consists of the material which becomes.

However, depending on the application, only the film layer 1a may be used without providing the metal foil layer 1c, or only the metal foil layer 1c may be used without providing the film layer 1a. If the layer in contact with the heat-sealing layer 2 of the base material layer 1 has good adhesion to the heat-sealing layer 2 or the adhesion to the heat-sealing layer 2 through the anchor coat layer can be improved, The number and material of the material layers 1 are not particularly limited.
Examples of the laminated material of the base material layer 1 include metal foils such as aluminum foil, paper, polyolefin resins, polyamide resins, polyester resins, and the like, or extruded products.

  Moreover, the thickness of the base material layer 1 (the film layer 1a, the adhesive layer 1b, the metal foil layer 1c, the anchor coat layer 1d and the intermediate layer 1e) and the heat-sealing layer 2 is not particularly limited, and depends on the use. Can be selected as appropriate. That is, the film layer 1a has an appropriate thickness depending on the material used. The adhesive layer 1b and the anchor coat layer 1d are used in such an amount that the layers disposed on the upper and lower surfaces can be sufficiently bonded. When using an aluminum foil, it is 5-50 micrometers, for example. The heat-sealing layer 2 is set to a necessary and sufficient thickness capable of performing heat sealing, and is preferably, for example, 5 to 50 μm, particularly 10 to 40 μm. When the thickness is less than 5 μm, there is an influence of the content adhesion preventing layer 3 coated thereon, and sufficient adhesion to the container may not be obtained.

  The heat-sealing layer 2 is not particularly limited as long as the adhesiveness with the base material layer 1 (intermediate layer 1e), the content adhesion preventing layer 3 and the container 5 is good. However, for example, general resins composed of polyolefin resins such as ethylene / vinyl acetate copolymer resins, polyethylene resins, polypropylene resins and ethylene / acrylic acid copolymer resins, polyester resins and polyamide resins are exemplified. be able to.

  The content adhesion preventing layer 3 is selected from synthetic hydrocarbon wax, modified synthetic wax, hydrogenated wax, fatty acid, fatty acid amide, fatty acid ester, Fischer-Tropsch wax, plant wax, animal wax, petroleum wax, and the like. A composition formed by dispersing one or more inorganic powders, organic powders, powder water-repellent resins, and liquid water-repellent resins that are incompatible with the wax in one or more waxes. Consists of. For example, a composition in which polyethylene wax powder and silicone oil are dispersed in paraffin wax can be exemplified.

As the wax, paraffin wax has a low melting point and can be applied on the heat sealing layer 2 at a low temperature. Therefore, it is preferable from the viewpoint of workability and the adhesion of the heat sealing layer 2 to the container.
Examples of the synthetic hydrocarbon wax include polyethylene wax produced by polymerization of ethylene or thermal decomposition of polyethylene, metallocene wax polymerized with a metallocene catalyst, and the like.
Examples of the modified synthetic wax include oxidized wax, organic acid-modified wax, and modified montan wax. Examples thereof include oxidized polyethylene wax, oxidized polypropylene wax, maleic acid-modified polyethylene wax, maleic acid-modified polypropylene wax, and montanic acid wax.

Examples of the hydrogenated wax include hardened castor oil.
Examples of fatty acids include monovalent carboxylic acids of long-chain hydrocarbons, such as butyric acid, lauric acid, pentadecylic acid, stearic acid, oleic acid, behenic acid, montanic acid, myristic acid, palmitic acid, paxenoic acid, erucic acid, etc. Is mentioned.
Examples of fatty acid amides include oleic acid amide, stearic acid amide, erucic acid amide, behenic acid amide, and lauric acid amide.

Examples of fatty acid esters include glycerin fatty acid esters, pentaerythritol fatty acid esters, polyglycerin fatty acid esters, and sorbitan fatty acid esters. For example, glycerol monostearate, glycerol monolaurate, glycerol monooleate, glycerol distearate, glycerol tristearate, diglycerol laurate, tetraglycerol laurate, pentaerythritol monostearate, pentaerythritol monolaurate, sorbitan mono Examples include stearate and sorbitan monobehenate.
Fischer-Tropsch wax is a wax produced by reacting carbon monoxide and hydrogen. Examples thereof include FT100 and FT-0070 (manufactured by Sazol), paraflint (manufactured by Sazol), and the like. It is done.

Examples of plant waxes include carnauba wax, wood wax, rice wax, and candelilla wax.
Animal waxes include beeswax, whale wax, shellac wax and the like.
Examples of the mineral wax include montan wax and ozokerite.
Examples of petroleum waxes include paraffin wax and microcrystalline wax.

Examples of the inorganic powder or powder include calcium carbonate, titanium oxide, silica, talc, and iron oxide.
Examples of the organic powder or powder include nylon, polyethylene, polypropylene, polyester, and various wax powders such as paraffin wax.
Examples of the liquid water repellent resin include silicone resins such as silicone oil and acrylic silicone, and fluorine resins.

  On the other hand, reference numeral 5 denotes a container. The container 5 has a bottomed cylindrical shape with an upper opening, and a flange 7 is provided on the periphery of the opening 6. The material of the container 5 is selected depending on the adhesiveness with the heat-sealing layer 2 and the temperature of heat sealing. When ethylene / vinyl acetate copolymer resin is used as the base polymer of the heat-sealing layer 2, the material of the container 5 is preferably polystyrene, polyethylene, polypropylene, paper, or paper having at least a heat-sealed surface coated with polyethylene.

The composition of the content adhesion preventing layer can be used by mixing and dispersing one or more fillers in one or more waxes. In the present invention, paraffin wax is preferable as the wax, polyethylene wax powder, silicone oil, and / or silica is preferable as the filler.
Moreover, the compounding amount of the composition of the content adhesion preventing layer is 40 to 99.5% by weight of wax, preferably 60 to 75% by weight, and 0.5 to 60% by weight of filler from the viewpoint of the adhesion preventing effect. %, Preferably 3 to 40% by weight. When the amount of the filler blended is less than 0.5% by weight, the adhesion preventing property is hardly obtained.

  The lid member 10 can be manufactured, for example, by the following method. A film layer 1a, a metal foil layer 1c, and an intermediate layer 1e are laminated in advance on a base material layer 1 on which an adhesive layer 1b and an anchor coat layer 1d are laminated. If the adhesiveness with the layer 1 is good, it is not particularly limited.) The composition formed by dispersing the filler in the wax is coated on the heat-sealing layer 2 to prevent adhesion of contents. Layer 3 is obtained.

Examples of the present invention will be described in detail below.
The lid member 10 having the structure shown in FIG. 1 was manufactured. At this time, a polyester film having a thickness of 12 μm printed on the heat-sealing layer side was used as the base film layer 1a. A polyester polyurethane adhesive was used for the adhesive layer 1b between the base film layer 1a and the metal foil layer 1c. A polyester polyurethane adhesive was used for the anchor coat layer 1d between the metal foil layer 1c and the intermediate layer 1e. As the metal foil layer 1c, an aluminum foil having a thickness of 20 μm was used. The intermediate layer 1e is made of polyethylene and has a thickness of 20 μm. The heat-sealing layer 2 was made of ethylene / vinyl acetate copolymer resin as a base polymer and had a thickness of 16 μm. A composition described later was used for the content adhesion preventing layer 3.

"Example 1"
A composition was prepared in which paraffin wax was melted at a liquid temperature of about 110 ° C., and polyethylene wax powder was not melted and dispersed as a powder, and at the same time, silicone oil was also dispersed. This composition was applied on the heat-sealing layer 2 having a flat surface state so as to have a thickness of 8 μm, thereby forming a content adhesion preventing layer 3. This lid material is referred to as Example 1.

"Examples 2 to 5"
In the same manner as in Example 1, a composition in which paraffin wax was melted at a liquid temperature of about 110 ° C. and the following filler was dispersed therein was prepared. These compositions were applied on the flat heat-sealing layer 2 having a surface state so as to have a thickness of 8 μm to form the content adhesion preventing layer 3. These lid materials are referred to as Examples 2 to 5, respectively.
Example 2: Polyethylene wax powder Example 3: Silica and silicone oil Example 4: Silica Example 5: Silicone oil

"Examples 6 to 10"
Each of the compositions used in Examples 1 to 5 was coated on the heat-sealing layer 2 having a gravure on the surface so as to have a thickness of 8 μm, thereby forming a content adhesion preventing layer 3. These lid materials are referred to as Examples 6 to 10, respectively.

"Example 11"
The composition used in Example 1 was coated on the flat heat-sealing layer having a thickness of 10 μm to form a content adhesion preventing layer 3. This lid material is referred to as Example 11.

"Example 12"
A composition was prepared by melting all the powder of polyethylene wax in paraffin wax. This composition was applied on the heat-sealing layer 2 having a flat surface state so as to have a thickness of 8 μm, thereby forming a content adhesion preventing layer 3. This lid material is referred to as Example 12.

  A composition in which silicone wax was dispersed in polyethylene wax was applied on the heat-sealing layer 2 having a flat surface state so as to have a thickness of 8 μm to form a content adhesion preventing layer. This lid material is referred to as Example 13.

"Comparative Examples 1 and 2"
The cover material which prepared the base material layer 1 and the heat sealable layer 2 without the content adhesion prevention layer, and the surface state of the heat sealable layer was flat was prepared. This is referred to as Comparative Example 1.
A lid material was prepared which was composed of the base material layer 1 and the heat sealable layer 2 without providing the content adhesion preventing layer, and was provided with gravure on the surface of the heat sealable layer. This is referred to as Comparative Example 2.

“Comparative Examples 3 and 4”
The composition comprising the following wax was applied on the heat-sealing layer 2 having a flat surface state so as to have a thickness of 8 μm to form a content adhesion preventing layer. These lid materials are referred to as Comparative Examples 3 and 4, respectively.
Comparative Example 3: Paraffin wax Comparative Example 4: Polyethylene wax

The lid | cover material of the Example mentioned above and the comparative example was evaluated by performing the following tests. The results are shown in Table 1.
"Test method"
A yogurt of about 5 ° C. was filled in a paper poly container, heat sealed with a lid material, shaken vigorously 10 times, and the yogurt was brought into contact with the entire surface of the lid material. Next, the bottom of the container was finely struck 200 times on a desk, and then the lid was peeled off to observe the attached state of yogurt and evaluated according to the following criteria.
5: Almost no adhesion (the amount of adhesion is less than 3% of the lid material area)
4: Adhesion amount is 3% or more and less than 25% of lid material area 3: Adhesion amount is 25% or more and less than 50% of lid material area 2: Adhesion amount is 50% or more and less than 95% of lid material area 1: Adhesion amount is 95% or more

  From the above results, it can be seen that Examples 1 to 13 have good adhesion preventing properties. In particular, when the filler in the composition was present as a powder residue, the adhesion preventing property was even better.

1A and 1B are partial cross-sectional views showing an embodiment of the content-preventing lid material of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material layer 1a Film layer 1b Adhesive layer 1c Metal foil layer 1d Anchor coat layer 1e Intermediate layer 2 Heat sealing layer 3 Content prevention layer 10 Lid 5 Container 6 Opening 7 Flange

Claims (3)

In the heat-sealing lid material in which the heat-sealing layer and the content adhesion preventing layer are sequentially laminated on the base material,
A heat-sealing lid for packaging containers having a content adhesion preventing property, wherein the composition of the content adhesion preventing layer comprises a wax and a filler dispersed in the wax. The wax is one or more waxes selected from synthetic hydrocarbon wax, modified synthetic wax, hydrogenated wax, fatty acid, fatty acid amide, fatty acid ester, Fischer-Tropsch wax, plant wax, animal wax, petroleum wax. And
2. The filler according to claim 1, wherein the filler is one or more fillers selected from inorganic powder, organic powder, powder water-repellent resin, and liquid water-repellent resin that is incompatible with wax. Heat-sealing lid for packaging containers. A composition comprising a wax and a filler dispersed in the wax is coated on the heat-sealing layer of the lid material in which the heat-sealing layer is formed on the base material via the adhesive layer. A method for producing a heat-sealing lid for packaging containers having adhesion prevention properties.