JP7819966B2 - Packaging wrap - Google Patents

Description

The present invention relates to a packaging wrap that seals ingredients such as food or containers in which ingredients are stored, blocking the penetration of foreign matter, moisture, and air to protect the ingredients, and that has an adhesive portion to improve sealing performance.

Generally, food is susceptible to deterioration due to the proliferation of harmful microorganisms (microflora) caused by contact with harmful bacteria and putrefactive bacteria during the production, processing, and distribution processes. To prevent this and maintain freshness, food is sealed and stored in a sealed container.

One type of wrap material commonly used today is a polymerizable composition formed from a thin, conformable web or sheet material supplied in rolled form. Examples of such wrap materials include polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), and polyethylene (PE). These wrap materials exhibit clinging properties on at least one surface, in addition to the properties of additives such as plasticizers and tackifiers, in addition to the properties of the polymeric materials from which they are formed, allowing them to adhere to and seal the item.

The adhesiveness of such wrap materials plays an important role in maintaining the freshness of food, but they must maintain their sealing ability continuously to protect food from oxygen, moisture/water vapor, odors, and bacterial penetration.

As disclosed in Korean Patent Publication No. 10-2004-0045917 (June 2, 2004), existing storage wrap materials have multiple protrusions and recesses formed in the wrap material, and an adhesive composition is coated on the protrusions or recesses to allow them to adhere to the surface of the item to be sealed by the adhesive composition, thereby maintaining their sealing performance.

However, such conventional wrap materials must maintain their shape before the protrusions and depressions are attached to the surface of the article, i.e., when stored in a rolled state, in order to protect the adhesive composition. In this case, the thickness must be sufficiently thick to provide the strength to maintain the shape of the protrusions and depressions, and the wrap material must also be made of a material that can maintain its strength, which results in high product costs.

Furthermore, when using the wrap material, the wrap material must be pushed or pulled with sufficient force to widen the protrusions and recesses in order to adhere the adhesive composition to the surface of the article, which can be inconvenient to use.

Korean Patent Publication No. 10-2004-0045917

Therefore, the object of the present invention is to provide a packaging wrap that can reduce manufacturing costs by providing a protective sheet on the open underside of the convex portions to support the convex portions in order to maintain their shape, thereby enabling the wrap sheet portion to be manufactured with a thin thickness, and the material for the wrap sheet portion to be made of standard, general-purpose wrap material.

Another object of the present invention is to provide a packaging wrap in which the protective sheet is made of a porous sheet, allowing the protective sheet to be sufficiently torn even with little pulling or pressing force on the wrap sheet when in use, thereby improving convenience of use.

To achieve the above objective, the packaging wrap of the present invention includes a wrap sheet having a plurality of convex portions formed thereon with valley portions formed between the convex portions; an adhesive portion laminated to the inner surface of the convex portions of the wrap sheet and adhering or bonding to the surface of an article when the wrap sheet is in use, thereby maintaining the airtightness of the wrap sheet; and a protective sheet laminated to the valley portions of the wrap sheet, closing the open lower surfaces of the convex portions and supporting the convex portions so that they maintain their shape, and detaching when the wrap sheet is pulled laterally with a set force or pressed, thereby opening the lower surfaces of the convex portions.

The convex portion includes a side portion that protrudes upward and a top portion that is formed on the upper part of the side portion and covers the top surface. The side portion may be formed in a circular, elliptical, or polygonal shape, and the top portion may be formed in a flat shape so that the adhesive portion is stacked in a flat plate shape.

The protective sheet can be formed to be thinner than the wrap sheet.

The protective sheet may include a lamination portion that adheres to the valley portion of the wrap sheet and a sealing portion that closes the open lower surface of the convex portion.

The protective sheet can be made of a material and have a thickness that allows it to be detached when a force is applied in a lateral direction or a pushing direction to the wrap sheet when the wrap sheet is attached to an item.

The protective sheet can be formed with numerous holes to facilitate removal.

As described above, the packaging wrap of the present invention can be manufactured with a thin wrap sheet portion by supporting the convex portions so that the shape of the convex portions can be maintained by attaching a protective sheet to the open underside of the convex portions of the wrap sheet. Furthermore, the material of the wrap sheet portion can also be used as a general-purpose wrap material, thereby reducing manufacturing costs.

In addition, the protective sheet covers the open underside of the convex portion, protecting the adhesive portion laminated on the inner surface of the convex portion, improving the performance of the packaging wrap.

In addition, the protective sheet is made of a porous sheet with multiple holes, so when using the wrap sheet, the protective sheet can be removed easily with little pulling or pushing force, improving convenience of use.

1 is a perspective view of a packaging wrap according to a first embodiment of the present invention; 1 is a cross-sectional view of a packaging wrap according to a first embodiment of the present invention. 1 is a plan view of a packaging wrap according to a first embodiment of the present invention. 1 is a diagram showing a state in which the packaging wrap according to the first embodiment of the present invention is used. FIG. 4 is a cross-sectional view of a packaging wrap according to a second embodiment of the present invention.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the course of this description, the size and shape of components shown in the drawings may be exaggerated for clarity and convenience. Furthermore, terms specifically defined in consideration of the structure and operation of the present invention may vary depending on the intentions or practices of the user or operator. Definitions of such terms should be based on the overall content of this specification.

Figure 1 is a perspective view of a packaging wrap according to a first embodiment of the present invention wound around a roll member, and Figure 2 is a cross-sectional view of the packaging wrap according to the first embodiment of the present invention.

The packaging wrap 100 according to the first embodiment includes a wrap sheet 10 that is stored rolled up on a roll member 110 and has a plurality of protrusions 12 formed regularly or irregularly with valleys 14 formed between the protrusions; an adhesive portion 20 laminated to the inner surface of the protrusions 12 of the wrap sheet 10; and a protective sheet 30 laminated to the valleys 14 of the wrap sheet 10, covering the open lower surfaces of the protrusions 12 and supporting the protrusions 12 so that they maintain their shape, and releasing the protrusions 12 by detaching when a certain force is applied in the lateral direction.

The wrap sheet 10 is any thin, permeable or impermeable substrate used to wrap perishable products, and may include any material including, but not limited to, paper, polymeric or plastic film, cloth or fabric, woven fabric, nonwoven fabric, laminate, metal foil such as aluminum foil, coated paper such as wax paper or greaseproof paper, and combinations thereof.

Furthermore, the properties of the wrap sheet 10 may include, but are not limited to, combinations or grades of: porous, non-porous, microporous, gas or liquid permeable, impermeable, hydrophilic, hydrophobic, hygroscopic, oleophilic, oleophobic, high critical surface tension, low critical surface tension, surface pre-textured, elastic yield, sintered yield, electrically conductive, and electrically non-conductive.

Suitable polymeric films for the wrap sheet 10 material may include, but are not limited to, polyethylene, ethylene copolymers such as ethylene vinyl acetate (EVA), polypropylene, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinylidene chloride and copolymers (PVDC), latex structures, polystyrene, nylon, and the like. Polyolefins are generally preferred due to their low cost and ease of molding.

The thickness of the wrap sheet 10 is 0.005 mm to 0.051 mm. A more preferable thickness is 0.0076 mm to 0.025 mm. Because the thickness of this wrap sheet 10 is supported by the protective sheet 30, it can be made significantly thinner than the thickness of existing wrap materials.

The wrap sheet 10 includes multiple convex portions 12 that protrude upward and numerous valley portions 14 that are formed between these convex portions. The convex portions 12 may be formed to have different shapes and sizes, or may be formed to have the same size and shape.

As shown in Figure 3, the protrusions 12 are arranged in the horizontal and vertical directions, with the first row (A), second row (B), and third row (C) arranged horizontally arranged in a zigzag pattern in the vertical direction. In other words, the protrusions in the first row (A) are arranged between the protrusions in the second row (B), and the protrusions in the third row (C) are arranged between the protrusions in the second row (B), resulting in an overall zigzag arrangement. In this way, when multiple protrusions 12 are arranged in a zigzag pattern, the adhesive portions of the protrusions adhere to each other in a zigzag pattern when they adhere to the surface of an article, thereby improving sealing performance.

The protrusions 12 can be formed to have different sizes and shapes, or they can be manufactured to have the same size and shape.

The convex portion 12 is composed of a protruding side portion 42 and a top portion 44. The side portion 42 can be manufactured in a variety of shapes, including circular, polygonal, and elliptical. The top portion 44 is preferably flat, as the adhesive portion 20 is laminated on its inner surface. The wrap sheet 10 can be made of a material that can stretch within a set range when pulled laterally (left and right in Figure 2).

The adhesive portion 20 can include any material commonly considered to be used for adhering to the surface of an article. Adhesive materials (adhesives) that form the adhesive portion 20 can include, but are not limited to, glue, solvent-based adhesives, emulsions, and hot melt vacuum adhesives.

Such adhesive portion 20 is made of a material that can maintain its adhesive properties at room temperature and whose adhesive properties do not decrease when in contact with air.

Methods for forming the adhesive portion 20 on the wrap sheet 10 may include roller application, spraying, coating, printing, transfer, extrusion, brushing, padding, or a combination thereof.

The adhesive portion 20 can be applied to the wrap 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 even more preferably about 1 gsm to about 5 gsm, in grams per square meter (gsm).

The adhesive portion 20 can be made of a material that sticks to the product surface, meaning it can be attached and removed, or it can be made of a material that adheres, meaning it will not come off once attached.

The protective sheet 30 can be attached to the valley portions of the wrap sheet 10 using a variety of methods, including coating, lamination extrusion, and fusion bonding, and includes a lamination portion 34 that is laminated to the valley portions 14 and a sealing portion 32 that seals the open lower surfaces of the protrusions 12.

This protective sheet 30 is formed to be relatively thinner than the wrap sheet 10. For example, when the wrap sheet 10 is pulled left and right (laterally) to adhere the wrap sheet 10 to the surface of an article, the side portions 42 of the convex portions 12 spread left and right, causing the convex portions 12 to collapse and lose their shape. At this time, the sealing portions 32 peel off, exposing the undersides of the convex portions 12.

The thickness and material of the protective sheet 30 are determined so that it can burst and be removed when the wrap sheet 10 is pulled left and right during use, and it must be strong enough to withstand bursting when wound around a roll member (when not in use).

In other words, the protective sheet 30 must be strong enough to support the convex portions 12 so that they maintain their shape when the wrap sheet 10 is wound on a roll member, and must also be strong enough to rupture and detach when the wrap sheet 10 is pulled laterally during use, i.e., when the wrap sheet 10 is attached to the surface of an article, thereby exposing the underside of the convex portions 12.

Existing wrap materials must be thick enough to provide the strength necessary to maintain the shape of the convex portions, and the material must be selected with these factors in mind. In other words, the adhesive portion 20 is laminated on the inner surface of the convex portions 12, and the adhesive portion 20 is wound onto a roll member while maintaining the shape of the adhesive portion 20 laminated on the inner surface of the convex portions 12. When attaching to the surface of an item, the wrap sheet 10 is pulled or the convex portions 12 are pressed to adhere.

Therefore, in order for the protrusions on the wrap material to maintain their shape, a thickness that matches the thickness is required, and a suitable material must be used, which increases the cost of the wrap material.

In the packaging wrap of the present invention, the protective sheet 30 supports the open underside of the convex portions 12 of the wrap sheet 10, allowing the convex portions 12 to maintain their shape. This allows the thickness of the wrap sheet 10 to be further reduced, and general-purpose materials can be used, significantly reducing manufacturing costs.

When the wrap material configured in this manner is used, as shown in Figure 4, when the packaging wrap is attached to the surface of an item, a force (P) pulling the wrap sheet 10 sideways or a force (Q) pushing downward from above acts on the wrap sheet 10, causing the side portions 42 of the convex portions 12 to spread in both directions. This force causes the sealing portions 32 of the protective sheet 30 to burst and fall off, opening the undersides of the convex portions 12, and the adhesive portions 20 laminated on the convex portions 12 to come into contact with the surface of the item, sealing it.

Figure 5 is a cross-sectional view of a packaging wrap according to a second embodiment of the present invention.

The packaging wrap according to the second embodiment of the present invention is similar to the packaging wrap described in the first embodiment, except that it is formed from a porous sheet having a plurality of holes 70 formed in the protective sheet 30.

The advantage of forming a large number of holes 70 in the protective sheet 30 is that the protective sheet 30 can be easily removed. In this case, the shape of the holes 70 may be dotted, or may be circular, polygonal, or elliptical. The protective sheet 30 may be formed with dotted holes at regular intervals in a straight line perpendicular to the left-right direction of the wrap sheet.

In this way, the protective sheet 30 according to the second embodiment is formed with a large number of holes 70, which allows the wrap sheet 10 to be more easily detached by the applied force when pulled or pushed sideways, making it easier to open the protrusions.

The present invention has been described in detail above using specific preferred embodiments as examples, but the present invention is not limited to the above content, and various changes and modifications may be made by those skilled in the art to which the invention pertains without departing from the scope of the present invention.

Claims (7)

A packaging wrap for adhering to a surface of an article, comprising:
a wrap sheet having a plurality of protrusions formed thereon and having valleys formed between the protrusions;
an adhesive portion laminated on the inner surface of the convex portion of the wrap sheet and adhering or bonding to the surface of an article when the wrap sheet is used to maintain the sealing property of the wrap sheet;
a protective sheet laminated in close contact with the valley portion of the wrap sheet,
The protective sheet is laminated in close contact with the valley portions of the wrap sheet when wound around a roll member, covers the open lower surfaces of the convex portions, and supports the convex portions so that they maintain their shape. When the wrap sheet is pulled laterally to attach the wrap sheet to the surface of an article, the protective sheet has enough strength to burst and detach, thereby opening the lower surfaces of the convex portions, and is thinner than the wrap sheet. the protrusion includes a side surface portion protruding upward and an upper surface portion formed on an upper step of the side surface portion and closing an upper surface,
The packaging wrap according to claim 1 , wherein the side portions are formed in a circular, elliptical or polygonal shape, and the top portion is formed in a flat shape so that the adhesive portion is stacked in a flat plate shape. The packaging wrap according to claim 1, wherein the convex portions are arranged in a first row (A), a second row (B), and a third row (C) in the horizontal and vertical directions, the convex portions in the first row (A) being arranged between the convex portions in the second row (B), and the convex portions in the third row (C) being arranged between the convex portions in the second row (B), and the overall arrangement being in a zigzag pattern. The packaging wrap according to claim 1, wherein the adhesive portion is applied to the inner surface of the convex portion and is formed from a material that can be peeled off after being attached to the surface of an article. The packaging wrap according to claim 1, wherein the protective sheet includes a laminated portion that adheres to the valley portion of the wrap sheet and a sealing portion that closes the open lower surface of the convex portion. The packaging wrap according to claim 1, wherein the protective sheet has a large number of holes formed therein to facilitate removal. The packaging wrap according to claim 1, wherein the protective sheet has dotted holes formed at regular intervals in a direction perpendicular to the left-right direction of the wrap sheet.