Preservative film for packaging

Abstract

The preservative film for packaging according to the present invention comprises: a preservative film sheet in which a plurality of protrusions are formed and recesses are formed between the protrusions; the bonding part is laminated on the inner surface of the convex part of the preservative film sheet and is bonded or adhered to the surface of an article when the preservative film sheet is used so as to maintain the sealing property of the preservative film sheet; and a protective sheet which is laminated on the concave portion of the preservative film sheet, shields and supports the open lower surface of the convex portion so that the convex portion maintains its own shape, and when the preservative film sheet is pulled or pressed laterally by a set force, the protective sheet is torn open and the lower surface of the convex portion is opened. Therefore, the thin preservative film for packaging can be manufactured, the manufacturing cost can be reduced, the protection performance of the bonding part is improved, and the adhesion performance of the preservative film for packaging is improved.

Description

Technical Field

[0001] The invention relates to a fresh-keeping film for packaging, which can prevent foreign matter penetration, moisture and air penetration and protect the containers of food and other materials or storage materials by sealing them, and can be provided with an adhesive portion to improve the sealing performance. Background Art

[0002] Generally, during the production, processing and distribution of food, harmful microorganisms (microflora) proliferate due to contact with harmful bacteria or spoilage bacteria, and the food is prone to spoilage. Therefore, packaging wrap is used to seal the food for storage in order to prevent this phenomenon and maintain freshness.

[0003] At present, one of the commonly used cling film materials includes a polymeric composite material formed by a relatively thin compliant plate-like or sheet-like material supplied in a rolled form. As an example of such a cling film material, materials such as polyvinyl chloride (PVC), polyvinylidene chloride (PVDC) and polyethylene (PE) can be used. Such a cling film material exhibits a clinging property on at least one surface by adding the properties of additives such as plasticizers and tackifiers to the properties of the polymeric materials forming these materials, so that the material clings to the article to seal the article.

[0004] The close adhesion of such cling film materials is an important factor in maintaining the freshness of food. In order to protect food from the influence of oxygen, moisture / water vapor, odor or bacterial penetration, etc., it is necessary to continuously maintain the sealing performance.

[0005] As shown in Korean Patent Publication No. 10-2004-0045917 (June 2, 2004), the existing storage cling film material has a plurality of protrusions and recesses formed on the cling film material, an adhesive composition is applied to the protrusions and recesses and the adhesive composition is bonded to the surface of the object to be sealed, thereby continuously maintaining the sealing performance.

[0006] However, this conventional cling film material has the following problem: before the protrusions and recesses are attached to the surface of the article, that is, when it is stored in a state of being wound on a roll, it needs to be maintained in a form that can protect the adhesive composition. In this case, its thickness needs to be sufficiently thick so that it can have a strength that can maintain the form of the protrusions and recesses. The cling film material also needs to use a material that can maintain strength, so the price of the product becomes expensive.

[0007] Furthermore, when using a cling film material, in order to attach the adhesive composition to the surface of the article, it is necessary to press or pull the cling film material with sufficient force so that the protrusions and recesses can be unfolded, which is inconvenient to use.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Korean Patent Publication No. 10-2004-0045917 (June 2, 2004) Summary of the invention

[0011] Therefore, the object of the present invention is to provide the following packaging cling film, in order to maintain the convex shape of the cling film sheet, a protective sheet is set on the open lower surface of the convex to support the convex, thereby, a cling film sheet with a thinner thickness can be made, and the material of the cling film sheet can also use commonly used cling film materials, thereby saving manufacturing costs.

[0012] Another object of the present invention is to provide a packaging cling film, wherein the protective sheet is made of a porous sheet, and when the cling film sheet is used, the protective sheet can be fully torn even with a small amount of force to pull or press the cling film sheet, thereby improving the convenience of use.

[0013] In order to achieve the above-mentioned purpose, the packaging cling film of the present invention comprises: a cling film sheet, which is formed with a plurality of convex parts and concave parts between the convex parts; an adhesive part, which is laminated on the inner surface of the convex part of the cling film sheet and is bonded or pasted on the surface of an article to maintain the sealing property of the cling film sheet when the cling film sheet is used; and a protective sheet, which is laminated on the concave part of the cling film sheet and blocks and supports the open lower surface of the convex part so that the convex part maintains its own shape. When the cling film sheet is pulled sideways or pressed by a set force, the protective sheet will be torn and the lower surface of the convex part will be opened.

[0014] The above-mentioned convex portion may include a side portion and an upper portion, the above-mentioned side portion protrudes upward, the above-mentioned upper portion is formed at the upper end of the side portion and covers its upper surface, the above-mentioned side portion is formed in a circular, elliptical or polygonal shape, and the above-mentioned upper portion is formed in a planar shape so that the above-mentioned bonding portion is stacked into a flat plate shape.

[0015] The thickness of the protection sheet may be smaller than the thickness of the cling film sheet.

[0016] The protection sheet may include: a laminating portion attached to the concave portion of the cling film sheet; and a sealing portion covering an open lower surface of the convex portion.

[0017] The material and thickness of the protective sheet meet the following conditions: when the cling film sheet is attached to an article, if a force is applied to pull the cling film sheet sideways or to press the cling film sheet, the cling film sheet can be torn off.

[0018] The protective sheet is formed with a plurality of holes so as to be easily torn apart.

[0019] As described above, in the packaging cling film of the present invention, a protective sheet is attached to the open surface of the convex portion of the cling film sheet to support the convex portion so that the shape of the convex portion can be maintained, and a cling film sheet with a thinner thickness can be made. The material of the cling film sheet can also use commonly used cling film materials, thereby saving manufacturing costs.

[0020] Furthermore, the protective sheet shields the open lower surface of the convex portion to protect the adhesive portion laminated on the inner surface of the convex portion, thereby improving the performance of the packaging cling film.

[0021] Furthermore, the protection sheet is made of a porous sheet having a plurality of holes, and therefore, when the cling film sheet is used, the protection sheet can be fully torn even with a small amount of force to pull or press the cling film sheet, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of a packaging cling film according to the first embodiment of the present invention.

[0023] Figure 2 4 is a cross-sectional view of a packaging cling film according to a first embodiment of the present invention.

[0024] Figure 3 It is a top view of the packaging cling film according to the first embodiment of the present invention.

[0025] Figure 4 This is a diagram showing the use of the packaging cling film according to the first embodiment of the present invention.

[0026] Figure 5 4 is a cross-sectional view of a packaging cling film according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the process, for the clarity and convenience of the description, the size or shape of the structural elements shown in the drawings may be enlarged and shown. In addition, the terms specifically defined in consideration of the structure and function of the present invention may be changed according to the intention or practice of the user or operator. The definition of such terms should be given based on the overall content of this specification.

[0028] Figure 1 This is a three-dimensional view of a packaging cling film wound on a roller component according to a first embodiment of the present invention. Figure 24 is a cross-sectional view of a packaging cling film according to a first embodiment of the present invention.

[0029] The packaging cling film 100 of the first embodiment includes: a cling film sheet 10, which is stored in a state of being wound on a roller member 110, and a plurality of convex portions 12 are formed regularly or irregularly, and concave portions 14 are formed between the convex portions; an adhesive portion 20, which is laminated on the inner surface of the convex portion 12 of the cling film sheet 10; and a protective sheet 30, which is laminated on the concave portion 14 of the cling film sheet 10, covers the open lower surface of the convex portion 12 and supports it so that the convex portion 12 maintains its own state, and when a specified force is applied to the side, the above-mentioned protective sheet 30 will be torn and the convex portion 12 will be opened.

[0030] The plastic wrap sheet 10 is any thin permeable or impermeable substrate used for plastic wrapping of perishable products, and may include any material including paper, polymer or plastic film, cloth or fabric, woven fabric, non-woven fabric, laminate, metal foil such as aluminum foil, coated paper such as wax paper or greaseproof paper, and combinations thereof, but is not limited thereto.

[0031] Furthermore, the properties of the cling film sheet 10 may include a combination or level of porosity, non-porosity, microporous, gas or liquid permeability, impermeability, hydrophilicity, hydrophobicity, hydroscopicity, oleophilicity, oleophobicity, high critical surface tension, low critical surface tension, surface pre-textured, elastic yield, plastic yield, conductivity and non-conductivity, but are not limited thereto.

[0032] Polymer films suitable for the material of the cling film sheet 10 include polyethylene, ethylene-vinyl acetate (EVA) and other ethylene copolymers (EVA), polypropylene, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinylidene chloride and its copolymers (PVDC), latex structure, polystyrene, nylon, etc., but are not limited thereto. Polyolefins are preferably used as substitutes due to low cost and ease of molding.

[0033] The thickness of the cling film sheet 10 is 0.005 mm to 0.051 mm. A more preferred thickness is 0.0076 mm to 0.025 mm. Since the cling film sheet 10 is supported by the protective sheet 30, the thickness of the cling film sheet 10 can be substantially smaller than the thickness of the existing cling film material.

[0034] The cling film sheet 10 may include: a plurality of convex portions 12 protruding upward; and a plurality of concave portions 14 formed between the plurality of convex portions. The shapes and sizes of the convex portions 12 may be different or the same.

[0035] like Figure 3 As shown, the convex parts 12 are arranged in the horizontal direction and the vertical direction, and the first column part A, the second column part B and the third column part C arranged in the horizontal direction are arranged in a zigzag shape in the vertical direction. That is, the convex parts of the first column part A are arranged between the convex parts of the second column part B, and the convex parts of the third column part C are arranged between the convex parts of the second column part B, and the whole is arranged in a zigzag shape. As described above, if a plurality of convex parts 12 are arranged in a zigzag shape, when the adhesive parts of the convex parts are attached to the surface of the article, they are attached to each other in a zigzag shape, thereby improving the sealing performance.

[0036] The size and shape of the protrusions 12 may be different or the same.

[0037] The convex portion 12 is composed of a protruding side portion 42 and an upper portion 44. The side portion 42 can be made into various shapes such as a circle, a polygon, an ellipse, etc. The upper portion 44 is laminated with the adhesive portion 20 on the inner surface, so it is preferably formed into a flat shape. Figure 2 The material is formed so that it can expand and contract within a set range when pulled (in the left and right directions).

[0038] The adhesive part 20 may include all materials that can be used to attach to the surface of an object. The adhesive material (adhesive) forming the adhesive part 20 may include glue, solvent adhesive, emulsion and high temperature melting pressure reduction adhesive, but is not limited thereto.

[0039] Such an adhesive portion 20 is made of a material that can maintain adhesive properties at room temperature, and a material that does not deteriorate in adhesive properties when in contact with air can be used.

[0040] The method of forming the bonding portion 20 on the cling film sheet 10 may include roller coating, spray coating, coating, printing, transfer, extrusion, brush coating, pad coating or a combination thereof. The bonding portion 20 can be coated on the cling film sheet at a level of about 0.1 gsm to about 50 gsm, preferably, about 0.5 gsm to about 20 gsm, more preferably, about 1 gsm to about 10 gsm, and most preferably, about 1 gsm to about 5 gsm.

[0041] The adhesive portion 20 may be formed of a material that is adhered to the product surface, that is, can be torn off after being attached, or may be formed of a material that is pasted, that is, will not fall off after being attached once.

[0042] The protection sheet 30 can be attached to the concave portion of the cling film sheet 10 by various methods such as coating, lamination extrusion, and welding, and includes a lamination portion 34 laminated on the concave portion 14 and a sealing portion 32 covering the open lower surface of the convex portion 12 .

[0043] The thickness of the protective sheet 30 is smaller than that of the cling film sheet 10. In order to attach the cling film sheet 10 to the surface of an article, for example, if the cling film sheet 10 is pulled left or right (laterally), the convex portion 12 will collapse as the side portions 42 of the convex portion 12 expand left or right, causing the convex portion 12 to be unable to maintain its own shape. In this case, as the sealing portion 32 is torn open, the lower surface of the convex portion 12 will be open.

[0044] The thickness and material of the protective sheet 30 are determined so that it can be torn apart for use by pulling the cling film sheet 10 left and right, and when it is wound on a roll member (not in use), it needs to have sufficient strength to withstand rupture.

[0045] That is, when the cling film sheet 10 is wound on the roller member, the protective sheet 30 has sufficient strength to support the protrusion 12 to maintain the shape of the protrusion 12, and should have the following strength: when in use, that is, when the cling film sheet 10 is attached to the surface of an article, if the cling film sheet 10 is pulled sideways, the protective sheet 30 will be broken and torn to open the lower surface of the protrusion 12.

[0046] In the existing cling film material, in order to maintain the strength required for the convex shape, it is necessary to ensure its thickness, and it is necessary to consider this matter when selecting the material. That is, the adhesive portion 20 is laminated on the inner surface of the convex portion 12, so it is directly wound on the roller member while maintaining the adhesive portion 20 laminated on the inner surface of the convex portion 12. When attached to the surface of the article, the cling film sheet 10 is pulled or the convex portion 12 is pressed to achieve adhesion.

[0047] Therefore, the convex portion of the cling film material needs to have a thickness that matches its own shape, and needs to be made of a suitable material, which leads to a problem of increased cost of the cling film material.

[0048] In the packaging cling film of the present invention, the protective sheet 30 supports the open lower surface of the convex portion 12 of the cling film sheet 10 so that the convex portion 12 can maintain its own shape. Therefore, a thinner cling film sheet 10 can be formed, and the material can also use generally used materials, thereby significantly reducing manufacturing costs.

[0049] Observe the use status of the cling film material as described above, such as Figure 4 As shown, when the packaging cling film is attached to the surface of an article, if a force P is applied to pull the cling film sheet 10 sideways or a force Q is applied to press from the upper side to the lower side, the side surface portions 42 of the protrusion 12 will expand to both sides. By this force, the sealing portion 32 of the protective sheet 30 is broken and torn open to open the lower surface of the protrusion 12, and the adhesive portion 20 stacked on the protrusion 12 contacts and adheres to the surface of the article to seal the article.

[0050] Figure 54 is a cross-sectional view of a packaging cling film according to a second embodiment of the present invention.

[0051] The wrapping film for packaging according to the second embodiment of the present invention is the same as the wrapping film for packaging described in the first embodiment, except that the protective sheet 30 is formed as a porous sheet having a plurality of holes 70 formed therein.

[0052] A plurality of holes 70 are formed in the protective sheet 30, so that the protective sheet 30 can be easily torn. In this case, the hole 70 may be in the form of a dotted line, or in the form of a circular, polygonal or elliptical hole. In the protective sheet 30, dotted holes may be formed in a straight line at a predetermined interval along a right angle direction in the left-right direction of the plastic wrap sheet.

[0053] As described above, the plurality of holes 70 are formed in the protection sheet 30 of the second embodiment, so that the protection sheet 30 can be easily torn apart by the force applied when the cling film sheet 10 is pulled or pressed sideways, thereby easily opening the convex portion.

[0054] The present invention has been illustrated and described above by taking specific preferred embodiments as examples, but the present invention is not limited to the above embodiments, and those skilled in the art in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit of the present invention.

Claims

1. A packaging cling film, used to be attached to the surface of an article, characterized in that: include: The cling film sheet is formed with a plurality of convex portions, and concave portions are formed between the convex portions; an adhesive portion, laminated on the inner surface of the convex portion of the cling film sheet, and when the cling film sheet is used, the adhesive portion is adhered or stuck to the surface of the article to maintain the sealing property of the cling film sheet; and The protective sheet is closely attached to and laminated on the concave portion of the plastic wrap sheet. When wound on the roller component, the protective sheet is closely attached to and stacked on the concave portion of the cling film sheet to cover and support the open lower surface of the convex portion so that the convex portion maintains its own shape. The protective sheet has the following strength: when the cling film sheet (10) is pulled sideways to attach the cling film sheet (10) to the surface of an object, the protective sheet will be broken and torn open to open the lower surface of the convex portion (12). The thickness of the protective sheet is less than the thickness of the cling film sheet.

2. The packaging cling film according to claim 1, characterized in that: The convex portion includes a side portion and an upper portion, the side portion protrudes upward, and the upper portion is formed at the upper end of the side portion and covers the upper surface thereof. The side surface portion is formed in a circular, elliptical or polygonal shape, and the upper surface portion is formed in a flat shape, so that the bonding portion is stacked in a flat plate shape.

3. The packaging cling film according to claim 1, characterized in that: The above-mentioned protrusions are arranged in the first column (A), the second column (B) and the third column (C) in the horizontal and vertical directions. The protrusions of the first column (A) are arranged between the protrusions of the second column (B), and the protrusions of the third column (C) are arranged between the protrusions of the second column (B), so that the whole is arranged in a zigzag shape.

4. The packaging cling film according to claim 1, characterized in that: The adhesive portion is coated on the inner surface of the convex portion and is formed of a material that can be torn off again after being attached to the surface of the article.

5. The packaging cling film according to claim 1, characterized in that: The above-mentioned protective sheet comprises: a laminated portion attached to the concave portion of the plastic wrap sheet; and The sealing portion covers the open lower surface of the convex portion.

6. The packaging cling film according to claim 1, characterized in that: A plurality of holes are formed in the protection sheet so that the protection sheet can be easily torn open.

7. The packaging cling film according to claim 1, characterized in that: On the protection sheet, dotted holes are formed on a straight line at predetermined intervals along a right angle direction in the left-right direction of the cling film sheet.

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