Recyclable pouch for packaging high-weight feed

Abstract

The present invention relates to a pouch for packaging feed, in which a high-density polyethylene (HDPE) film as an outer layer and a linear low-density polyethylene (LLDPE) film as an inner layer are laminated, wherein the high-density polyethylene (HDPE) film is a film having a directional structure in a woven pattern. According to the present invention, it is possible to provide a pouch for packaging high-weight (3-25 kg) feed having excellent mechanical properties, such as tensile strength, tear strength, impact strength, and elongation, and excellent gas barrier properties.

Description

Recyclable heavy-duty feed packaging pouches

[0001] The present invention relates to a recyclable, heavy-duty feed packaging pouch. In particular, the present invention relates to a recyclable, heavy-duty feed packaging pouch having excellent impact resistance and standability, and being made of a single polyethylene (PE) material.

[0002] With the recent revision of the Resource Recycling Act, the demand for recyclable packaging materials has increased rapidly, and as the pet market grows in size, the demand for recyclable pouches for pet food packaging has also increased rapidly.

[0003] Existing feed packaging pouches are constructed of PET / Nylon / Aluminum / LLDPE, making them classified as "composite materials" and therefore non-recyclable. Therefore, efforts have been made to replace these "composite materials" with "single materials" that can be recycled. However, due to limitations in their mechanical properties, these materials have been inapplicable to packaging materials with relatively high loads (over 3 kg).

[0004] Accordingly, the purpose of the present invention is to provide a pouch for packaging heavy feed, which is recyclable using a single material and has excellent impact strength and standing properties, in order to solve the above-mentioned shortcomings of the prior art.

[0005] The present invention relates to a pouch for packaging feed, in which a high-density polyethylene (HDPE) film is laminated as an outer layer and a linear low-density polyethylene (LLDPE) film is laminated as an inner layer.

[0006] The above high-density polyethylene (HDPE) film is a cylindrical plastic film manufactured by a blown film extrusion method, cut at an angle of 22.5 to 67.5° to form a spiral shape, and then one sheet of the cut film is coated with an adhesive layer of the same material and extruded, and then another sheet of the cut film is laminated so that the directional grains of the films intersect, thereby providing a pouch for feed packaging, which is a film having a directional grain of an alternating type.

[0007] According to the present invention, a high-weight (3 to 25 kg) feed packaging pouch having excellent mechanical properties such as tensile strength, tear strength, impact strength, elongation, etc. and gas barrier properties can be provided.

[0008] The heavy-duty feed packaging pouch provided in the present invention is recyclable as it uses a single polyethylene material, and is advantageous in that manufacturing costs are reduced as MOPE or BOPE is not used.

[0009] Hereinafter, the present invention will be described in detail.

[0010]

[0011] The present invention provides a pouch for packaging feed in which a high-density polyethylene (HDPE) film as an outer layer and a linear low-density polyethylene (LLDPE) film as an inner layer are laminated.

[0012] The above high-density polyethylene (HDPE) film may be a film having directional grains in an alternating manner, i.e., a CCL HDPE film, which is formed by cutting a cylindrical plastic film manufactured by a blown film extrusion method into a spiral shape at an angle of 22.5 to 67.5 degrees, coating an adhesive layer of the same material on one sheet of the cut film, extruding the film, and then laminating another sheet of the cut film so that the directional grains of the films intersect. In the present invention, a film in which two sheets of slant-cut films are cross-laminated to form directional grains in an alternating manner is referred to as a 'CCL film' (Cross Cutting Lamination Film) (spiral cross-laminated film).

[0013] Conventional polyethylene films were either uniaxially oriented polyethylene (MOPE) films or biaxially oriented polyethylene (BOPE) films extruded using the blown process. Therefore, the orientation in the machine direction (MD) was higher than in the transverse direction (TD), resulting in a problem of directional characteristics (split, tearing characteristics).

[0014] To solve these problems, the present invention uses a CCL film having equally excellent tensile strength in both MD and TD directions.

[0015] The thickness of the above high-density polyethylene (HDPE) film may be 40 μm to 120 μm.

[0016] The above HDPE preferably has a melt index (MI) of 0.01 to 5 g / 10 min. If it is less than 0.01 g / 10 min, the formability of the blown film deteriorates, and if the MI exceeds 5 g / 10 min, the mechanical properties of the blown film deteriorate.

[0017] The above HDPE preferably has a density of 0.94 to 0.97 g / cm3. If it is less than 0.94 g / cm3, the mechanical properties of the blown film deteriorate, and if it exceeds 0.97 g / cm3, the elasticity, flexibility, stretchability, and impact resistance deteriorate.

[0018] The above LLDPE preferably has a melt index (MI) of 1 to 5 g / 10 min. If it is less than 1 g / 10 min, the formability of the blown film deteriorates, and if the MI exceeds 5 g / 10 min, the mechanical properties of the blown film deteriorate.

[0019] The above LLDPE preferably has a density of 0.925 to 0.940 g / cm3. If it is less than 0.925 g / cm3, the mechanical properties of the blown film deteriorate, and if it exceeds 0.940 g / cm3, the elasticity, flexibility, extensibility, and impact resistance deteriorate.

[0020]

[0021] According to one embodiment of the present invention, a gas barrier coating layer of cellulose, aluminum oxide or silicon oxide can be formed between the high-density polyethylene (HDPE) film and the linear low-density polyethylene (LLDPE) film.

[0022] The present invention uses a gas barrier coating layer of cellulose, aluminum oxide or silicon oxide, which has significantly improved O2 barrier properties compared to conventional nylon and aluminum.

[0023] The thickness of the above gas barrier coating layer may be 0.5 to 10 μm.

[0024] If the thickness of the above gas barrier coating layer is less than 0.5㎛, the gas barrier performance may be insufficient, and if it exceeds 10㎛, the recyclability may be reduced.

[0025]

[0026] The thickness ratio of the high-density polyethylene (HDPE) film and the linear low-density polyethylene (LLDPE) film may be 50:50 to 40:60, and the thickness of the entire film may be 150 to 200 μm.

[0027] The shape of the above pouch may be any one selected from the group consisting of two-way, three-way, M-way, stand-up, zipper, stick, and spout.

[0028] The above pouch is mainly made of a single material and is recyclable.

[0029] The feed packaging pouch of the present invention has excellent tensile strength, tear strength, impact strength, elongation, etc., and can be used for packaging heavy feed weighing 3 to 25 kg.

[0030] According to one embodiment of the present invention, the linear low-density polyethylene (LLDPE) film may be a CCL LLDPE film, which is a film in which a directional grain of an alternating shape is formed by cutting a cylindrical plastic film manufactured by a blown film extrusion method at an angle of 22.5 to 67.5° to have a spiral shape, coating an adhesive layer of the same material on one sheet of the cut film and extruding it, and then laminating another sheet of the cut film so that the directional grains of the films intersect.

[0031] When CCL LLDPE film and CCL HDPE film are laminated, mechanical properties can be improved. Therefore, it can also be used for packaging ultra-heavy feed weighing 25 to 100 kg.

[0032] The shape of the above pouch may be any one selected from the group consisting of two-way, three-way, M-way, stand-up, zipper, stick, and spout.

[0033] The pouch according to the present invention can be an eco-friendly pouch that can be recycled as it uses a single material of polyethylene (PE).

[0034] Hereinafter, the present invention will be described in more detail through specific examples and comparative examples.

[0035]

[0036] [ingredient]

[0037] For high-density polyethylene (HDPE) products, MI 0.05 g / 10 min, density 0.956 g / cm 3 SK products were used.

[0038] Linear low-density polyethylene (LLDPE) products have an MI of 1 g / 10 min and a density of 0.925 g / cm. 2 LG Chemical products were used.

[0039]

[0040] <Manufacturing Example 1> Manufacturing of CCL HDPE film

[0041] High-density polyethylene (HDPE) (MI 0.05 g / 10 min, density 0.956 g / cm 3 ) 300 kg was fed into the extruder of a blown film forming machine, and a blown film with a thickness of 80 ㎛ was manufactured under the following conditions.

[0042] <Film forming conditions>

[0043] Extrusion cylinder temperature: 170℃, die temperature: 170℃, extrusion amount: 50kg / hour,

[0044] Circular die: 200mm, die gap width: 0.7mm,

[0045] Blow-up ratio: 2.3, take-up speed: 6 m / min.

[0046]

[0047] In cooling the tube bubble, the neck of the bubble was gradually cooled to 80°C by blowing air from the first blower, the expanded portion of the bubble was gradually cooled to 60°C by blowing air from the second blower, the frost line region was gradually cooled to 40°C by blowing air from the third blower, and the bubble region was maintained at 40°C to manufacture a cylindrical plastic film.

[0048] The above cylindrical plastic film was cut at a 45° angle to form a spiral shape, and two cut high-density polyethylene (HDPE) films were cross-laminated in both MD and TD directions and bonded using an adhesive of the same material to obtain a film having a directional grain in an alternating weave shape. This is referred to as a CCL HDPE film.

[0049]

[0050] <Manufacturing Example 2> Manufacturing of CCL LLDPE film

[0051] Linear low-density polyethylene (LLDPE) (MI 1 g / 10 min, density 0.925 g / cm 3 ) 300 kg was fed into the extruder of a blown film forming machine, and a blown film with a thickness of 130 ㎛ was manufactured under the following conditions.

[0052] <Film forming conditions>

[0053] Extrusion cylinder temperature: 170℃, die temperature: 170℃, extrusion amount: 50kg / hour,

[0054] Circular die: 200mm, die gap width: 0.7mm,

[0055] Blow-up ratio: 2.3, take-up speed: 6 m / min.

[0056]

[0057] In cooling the tube bubble, the neck of the bubble was gradually cooled to 80°C by blowing air from the first blower, the expanded portion of the bubble was gradually cooled to 60°C by blowing air from the second blower, the frost line region was gradually cooled to 40°C by blowing air from the third blower, and the bubble region was maintained at 40°C.

[0058] The cooled tube bubble was extruded into a film, cut at a 45° angle, and two cut linear low-density polyethylene (LLDPE) films were cross-laminated in both MD and TD directions and laminated using an adhesive of the same material to obtain a film with a directional grain in an alternating weave pattern. This is referred to as a CCL LLDPE film.

[0059]

[0060] <Manufacturing Example 3> Manufacturing of LLDPE film

[0061] Linear low-density polyethylene (LLDPE) (MI 1g / 10min, density 0.925g / cm 3) 300 kg was fed into the extruder of a blown film forming machine, and a linear low-density polyethylene (LLDPE) film having a thickness of 130 μm was manufactured under the following conditions.

[0062] <Film forming conditions>

[0063] Extrusion cylinder temperature: 150℃, die temperature: 160℃, extrusion amount: 50kg / hour,

[0064] Circular die: 200mm, die gap width: 0.7mm,

[0065] Blow-up ratio: 2.0, take-up speed: 30 m / min.

[0066]

[0067] The neck of the bubble was gradually cooled to 80°C by blowing air from the first blower, the expanded portion of the bubble was gradually cooled to 60°C by blowing air from the second blower, and the frost line region was gradually cooled to 40°C by blowing air from the third blower, and the bubble region was maintained at 40°C.

[0068]

[0069] <Example 1>

[0070] The CCL HDPE film (thickness 80 ㎛) of Manufacturing Example 1 and the LLDPE film (thickness 130 ㎛) of Manufacturing Example 3 were laminated and bonded to obtain a two-layered specimen.

[0071] <Example 2>

[0072] Cellulose was coated to a thickness of 1 ㎛ on the LLDPE film (thickness 130 ㎛) of Manufacturing Example 3, and then the CCL HDPE film (thickness 80 ㎛) of Manufacturing Example 1 was laminated and laminated to obtain a specimen with a three-layer structure.

[0073] <Example 3>

[0074] A three-layered specimen was obtained in the same manner as in Example 2, except that the coating thickness of cellulose was set to 5 μm.

[0075] <Example 4>

[0076] The CCL HDPE film (thickness 80 ㎛) of Manufacturing Example 1 and the CCL LLDPE film (thickness 130 ㎛) of Manufacturing Example 2 were laminated and bonded to obtain a two-layered specimen.

[0077] <Example 5>

[0078] Cellulose was coated to a thickness of 5 μm on the CCL LLDPE film (thickness 130 μm) of Manufacturing Example 2, and then the CCL HDPE film (thickness 80 μm) of Manufacturing Example 1 was laminated and laminated to obtain a specimen with a three-layer structure.

[0079] <Example 6>

[0080] A three-layered specimen was obtained in the same manner as Example 5, except that aluminum oxide was coated to a thickness of 1 μm.

[0081] <Example 7>

[0082] A three-layered specimen was obtained in the same manner as Example 5, except that silicon oxide was coated to a thickness of 1 μm.

[0083]

[0084] The materials and thicknesses of each layer of Examples 1 to 7 are summarized in Table 1 below.

[0085]

[0086] Layer-by-layer material and thickness structure 1st layer - inner layer 2nd layer - coating layer 3rd layer - middle layer 4th layer - outer layer Total thickness unit ㎛ ㎛ ㎛ ㎛ Comparative example 1 LLDPE (130) Aluminum (10) Nylon (60) PET (20) 220 Comparative example 2 LLDPE (130) - Nylon (60) PET (20) 210 Comparative example 3 LLDPE (130) Aluminum (10) - MOPE (80) 220 Comparative example 4 LLDPE (130) Aluminum (10) - BOPE (80) 220 Comparative example 5 LLDPE (220) --- 220 Comparative example 6 MOPE (220) --- 220 Comparative example 7 BOPE (220) --- 220 Example 1 LLDPE (130) -- CCL HDPE(80)210Example 2LLDPE(130)Cellulose(1)-CCL HDPE(80)211Example 3LLDPE(130)Cellulose(5)-CCL HDPE(80)215Example 4CCL LLDPE(130)--CCL HDPE(80)210Example 5CCL LLDPE(130)Cellulose(5)-CCL HDPE(80)210Example 6CCL LLDPE(130)Aluminum Oxide(1)-CCL HDPE(80)211Example 7CCL LLDPE(130)Silicone Oxide(1)-CCL HDPE(80)211

[0087]

[0088] <Experimental Example 1> Mechanical properties

[0089] The mechanical properties of the specimens manufactured in the examples and comparative examples were evaluated in both MD and TD directions.

[0090] Tensile strength and elongation: Tensile strength (kgf / ㎠) and elongation (%) were measured for the specimens using the ASTM D638 method, and the results are shown in Table 2 below.

[0091] Tear strength: The tear strength was measured for the specimens using the ASTM D624 method, and the results are shown in Table 2 below.

[0092] Impact strength: The impact strength (Joule) of the specimens was measured using the ASTM D3420 method, and the results are shown in Table 2 below.

[0093]

[0094] <Experimental Example 2> Gas barrier properties

[0095] The gas barrier properties of the specimens manufactured in the examples and comparative examples were evaluated.

[0096] Oxygen barrier: Oxygen barrier was measured for the specimens using the ASTM D3985 method, and the results are shown in Table 2 below.

[0097] Vapor barrier properties: Vapor barrier properties were measured for the specimens using the ASTM F1249 method, and the results are shown in Table 2 below.

[0098] Fragrance retention: Fragrance retention was measured at a distance of 1 cm using SHINYEI OMX-SRM for the specimen, and the results are shown in Table 2 below.

[0099]

[0100] Mechanical properties, gas barrier properties, structure, tensile strength (MD / TD), tear strength (MD / TD), impact strength, elongation (MD / TD), oxygen (OTR), water vapor (WVTR), fragrance (Fragrance) Unit: kg f / cm 2 kg f / cmJoule%cc / m 2 / 24hrg / m 2 / 24hrMeasuring instrument value comparison example 1352 / 261173 / 1882.32298 / 328≤1.0≤1.0≤1.0Comparison example 2343 / 241174 / 1812.22312 / 34116.421.04.7Comparison example 3237 / 154115 / 1431.39394 / 555≤1.0≤1.0≤1.0Comparison example 4212 / 204157 / 162 1.18425 / 567≤1.0≤1.0≤1.0Comparative Example 5194 / 167171 / 1811.94392 / 6111073.410.5127.6Comparative Example 6224 / 175111 / 1641.55283 / 800976.29.181.2Comparative Example 7217 / 207118 / 1221.34345 / 484944.47.467.4Implemented Example 1348 / 332211 / 2234.39>800 / >800411.621.768.1Embodiment 2344 / 335207 / 2184.31>800 / >80013.431.211.9Embodiment 3351 / 346215 / 2214.34>800 / >800≤1.02.1≤1.0Embodiment 4411 / 399264 / 253>5.00> 800 / >800387.18.763.7Example 5405 / 403266 / 254>5.00>800 / >800≤1.02.9≤1.0Example 6391 / 395260 / 251>5.00>800 / >800≤1.0≤1.0≤1.0Example 7415 / 394259 / 250>5.00>800 / >800≤1.0≤1.0≤1.0

[0101]

[0102] As a result, as shown in Table 2 above, in the case of Example 1, by combining CCL HDPE with LLDPE, the mechanical properties can be dramatically increased compared to Comparative Example 4 (LLDPE / Aluminum / BOPE), and it can be seen that properties at a similar level to Comparative Example 1 (LLDPE / Aluminum / Nylon / PET) can be achieved.

[0103] In the case of Example 4, it can be seen that by combining CCL HDPE with CCL LLDPE, the mechanical properties can be dramatically increased compared to Example 1.

[0104] In addition, it can be seen that excellent gas barrier performance can be secured by coating cellulose between LLDPE and CCL HDPE in the case of Examples 2 and 3.

[0105] In addition, it can be seen that in the cases of Examples 5 to 7, excellent gas barrier performance can be secured by coating Cellulose, Aluminum Oxide, and Silicone Oxide between CCL LLDPE and CCL HDPE.

[0106] Accordingly, it was confirmed that the pouch of the present invention can be used as a pouch for packaging high-weight (3 to 25 kg) feed with excellent mechanical properties such as tensile strength, tear strength, impact strength, elongation, etc. and gas barrier properties.

[0107] <Research and Development Project Information>

[0108] - Assignment ID: 1425179703

[0109] - Assignment number: RS-2023-00267724

[0110] - Ministry name: Ministry of SMEs and Startups

[0111] - Project Management (Professional) Agency Name: Small and Medium Business Technology Information Promotion Agency

[0112] - Research Project Name: Small and Medium Enterprise Technology Innovation Development Project (Export-Oriented)

[0113] - Research Project Name: Development of a high-barrier film with guaranteed durability and excellent biodegradability in water and soil.

[0114] - Project execution organization name: R&F Chemical Co., Ltd. [Host]

[0115] - Research period: July 17, 2023 - July 16, 2027 (4 years and 0 months)

Claims

1. A pouch for feed packaging in which a high-density polyethylene (HDPE) film is laminated as an outer layer and a linear low-density polyethylene (LLDPE) film is laminated as an inner layer. The above high-density polyethylene (HDPE) film is a feed packaging pouch formed by cutting a cylindrical plastic film manufactured by a blown film extrusion method into a spiral shape at an angle of 22.5 to 67.5°, coating an adhesive layer of the same material on one sheet of the cut film, extruding it, and then laminating another sheet of the cut film so that the directional grains of the films intersect, thereby forming a film with directional grains of an alternating weave type.

2. In paragraph 1, A pouch for packaging feed, wherein the thickness of the high-density polyethylene (HDPE) film is 40 ㎛ to 120 ㎛.

3. In paragraph 1, A pouch for packaging feed, wherein a gas barrier coating layer of cellulose, aluminum oxide or silicon oxide is formed between the high-density polyethylene (HDPE) film and the linear low-density polyethylene (LLDPE) film.

4. In paragraph 3, A pouch for feed packaging, wherein the thickness of the gas barrier coating layer is 0.5 to 10㎛.

5. In paragraph 1, A pouch for feed packaging, wherein the thickness ratio of the high-density polyethylene (HDPE) film and the linear low-density polyethylene (LLDPE) film is 50:50 to 60:40, and the thickness of the entire film is 150 to 200㎛.

6. In paragraph 1, A pouch for packaging feed, wherein the shape of the pouch is any one selected from the group consisting of a two-way, three-way, M-way, stand-up, zipper, stick, and spout.

7. In paragraph 1, A recyclable pouch for packaging feed.

8. In paragraph 1, A feed packaging pouch that can be used for packaging feed weighing 3 to 25 kg.

9. In paragraph 1, The above linear low-density polyethylene (LLDPE) film is a feed packaging pouch, which is a film formed by cutting a cylindrical plastic film manufactured by a blown film extrusion method into a spiral shape at an angle of 22.5 to 67.5°, coating an adhesive layer of the same material on one sheet of the cut film, extruding it, and then laminating another sheet of the cut film so that the directional grains of the films intersect, thereby forming a film with directional grains of an alternating weave type.

10. In paragraph 9, A feed packaging pouch that can be used for packaging ultra-heavy feed weighing 25 to 100 kg.