KR20160133833A - Packaging film with increased durability and elongated lifetime and method for manufacturing the same - Google Patents
Packaging film with increased durability and elongated lifetime and method for manufacturing the same Download PDFInfo
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- KR20160133833A KR20160133833A KR1020150066873A KR20150066873A KR20160133833A KR 20160133833 A KR20160133833 A KR 20160133833A KR 1020150066873 A KR1020150066873 A KR 1020150066873A KR 20150066873 A KR20150066873 A KR 20150066873A KR 20160133833 A KR20160133833 A KR 20160133833A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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Abstract
The present invention relates to a packaging film having improved durability and prolonged life span and a method of manufacturing the same. More specifically, the present invention minimizes deformation or discoloration of a packaging film caused by an external environment such as ultraviolet rays, A packaging film having an improved durability and an extended life, and a manufacturing method thereof.
Description
The present invention relates to a packaging film having improved durability and prolonged life span and a method of manufacturing the same. More specifically, the present invention minimizes deformation or discoloration of a packaging film caused by an external environment such as ultraviolet rays, A packaging film having an improved durability and an extended life, and a manufacturing method thereof.
Generally, pallets are packed using packing film to prevent water loss, protect against cold, and ensure proper air permeation in the process of peeling various raw materials and products such as building materials and processed foods.
As such packaging films, synthetic resins having high stretchability such as polyethylene (PE) and polypropylene (PP) and having good heat shrinkability, processability and mechanical properties are mainly used.
For example, a large number of raw materials or products are mounted on a pallet, and the whole is wrapped tightly with a packaging film made of polyethylene resin or the like, or shrink wrapped by applying heat thereto to protect the product from damage from external impact, So that it can be easily transported.
However, when the packaging film is wrapped with various raw materials and products, when the period of about 3 months is over, the original function of the packaging film is deteriorated due to the external environment such as sunlight, rain, snow, In particular, there is a disadvantage in that not only the packaging film but also the paper bag packed in the packaging film causes discoloration due to the ultraviolet rays caused by the sunlight and affects the quality of the product.
That is, the external environment generally causes degradation of the synthetic resin, resulting in deterioration of mechanical and physical properties and change of the chemical structure. This is because when a polymer such as a packaging film is exposed to light, Chromophores having a double bond structure in the polymer absorbs ultraviolet rays to generate free radicals while causing scattering or absorption of the polymer in the film, resulting in discoloration due to continuous decomposition.
As such, conventionally, in the process of peeling various raw materials or products, the packaging film is discolored or deformed, resulting in deterioration of quality and shortening of life span, and thus unnecessary cost is additionally incurred. There was also concern about environmental pollution.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a film for packaging various raw materials or products such as building materials and processed foods, The present invention provides a packaging film with improved durability and an extended service life, and a method of manufacturing the packaging film, which improves the economical efficiency by improving the quality and the service life by minimizing the chemical deformation.
In order to accomplish the above object, a packaging film according to a preferred embodiment of the present invention comprises: a substrate layer made of low-density polyethylene and a linear low-density polyethylene resin, And a compounding layer formed by mixing a stabilizer having a molecular formula (C 15 H 25 NO 4 ) n with a stabilizer having a molecular formula (C 35 H 66 N 8 ) n and disposed between the two base layers, Is formed.
Here, 17 to 27% by weight of the low-density polyethylene resin, 70 to 80% by weight of the linear low-density polyethylene resin, and 2.5 to 3.5% by weight of the compounding agent are preferably mixed.
In addition, the method for producing a packaging film according to the present invention comprises the steps of: a) coating a conductive material so that the polyethylene raw material has a positive charge and the compounding raw material has a negative charge; b) separating the charged polyethylene raw material and the compounding raw material by a specific gravity difference; And c) extrusion molding such that an electrostatic repulsive force acting between the polyethylene raw material and an electrostatic attraction acting between the polyethylene raw material and the compounding raw material act so that the polyethylene raw material is arranged at the upper and lower portions of the compounding raw material .
Here, the polyethylene raw material is composed of a low density polyethylene resin and a linear low density polyethylene resin, and the compounding raw material is a mixture of a substance having a molecular formula (C 15 H 25 NO 4 ) n and a substance having a molecular formula (C 35 H 66 N 8 ) n Material.
In the step a) of the present invention, the polyethylene material mixed with the conductive material is heated at 150 ° C for the first time, and the temperature is controlled to be 110 ° C while being lowered by 10 ° C at intervals of 20 to 30 minutes. And the polyethylene material and the compounding material are coated with a conductive material so that the melt index is controlled to be low.
In step b), it is preferable that the low-density polyethylene resin and the linear low-density polyethylene resin and the compounding material are subjected to layer separation by blowing air from the bottom.
In the step c), 17 to 27% by weight of the low-density polyethylene resin, 70 to 80% by weight of the linear low-density polyethylene resin, and 2.5 to 3.5% by weight of the raw material mixture are preferably used.
As described above, according to the present invention, a packaging film comprising polyethylene resin as a main component is prepared for packing various raw materials or products in a process of peeling them, and a plastic additive (compounding agent) It protects the raw materials and products by removing ultraviolet rays and removes moisture, minimizes deformation caused by external environment, and improves quality. Durability and service life can be extended by 3 ~ 5 years depending on thickness, Accordingly, economical effects due to cost reduction can be achieved, and the occurrence of industrial waste can be significantly reduced, which is advantageous in that it is environmentally friendly.
1 is a structural view of a packing film according to a preferred embodiment of the present invention;
2 is a process diagram showing a manufacturing process of a packaging film according to the present invention
Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the technical idea of the present invention. The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
A. Packing film
The packaging film according to the present invention comprises: a
Such packaging films are formed in a one-layer structure.
This will be described in detail as follows.
The
Low-density polyethylene is transparent and has good flexibility, low vapor permeability, and excellent properties such as processability, tensile properties, thermal adhesiveness, and mechanical workability.
The low-density polyethylene has a density of 0.915 (g / cm 3), a crystallinity of about 55%, and a melting point of 110 to 120 ° C, and its content is 17 to 27% by weight.
Linear low density polyethylene is transparent and has good flexibility, low vapor permeability, excellent heat resistance, impact resistance, and excellent tensile strength and burst strength.
The linear low density polyethylene has a density of 0.915 to 0.925 (g / cm 3), a crystallinity of 55 to 60% and a melting point of 110 to 130 캜, and the content thereof is 70 to 80% by weight.
The
As such a blending raw material, a first stabilizer and a second stabilizer belonging to Hindered Amine Light Stabilizer (HALS) are mixedly used.
The first stabilizer is poly [1- (2'-hydroxyethyl) -2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate (Poly [ 2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate, and the molecular formula is (C 15 H 25 NO 4 ) n .
The first stabilizer has a white granule shape, has low volatility and migration, is effective in preventing oxidation, has thermal stability, has excellent surface protecting action, has a molecular weight of 3100 to 4000, a melting point of 55 to 70 ° C Is used.
The second stabilizer is poly [[6- [(1,1,3,3-tetramethylbutyl) amino] -1,3,5-triazine-2,4-diyl] [(2,2,6,6- (2,2,6,6-tetramethyl-4-piperidyl) imino]] (Poly [[6- [(1,1,3,3-tetramethylbutyl) amino] -1,3,5-triazine-2,4-diyl] [(2,2,6,6-tetramethyl- 6-hexanediyl [(2,2,6,6-tetramethyl -4-piperidinyl) imino]] made of a component, the molecular formula is (C 35 H 66 n 8) n.
Such a second stabilizer is in the form of a light yellow powder or granule, is stable to light and effective for preventing oxidation, has a molecular weight of 2100 to 3100 and a melting point of 100 to 135 ° C.
The content of the compounding agent in which the first and second stabilizers are mixed is 2.5 to 3.5% by weight.
B. Manufacturing Method of Packaging Film
The method for producing a packaging film according to the present invention comprises the steps of charging a polyethylene raw material composed of a low density polyethylene resin and a linear low density polyethylene resin and a compounding raw material, respectively; Separating the low density and linear low density polyethylene resin and the compounding material by the specific gravity difference; And extrusion molding the compounding raw material so that the compounding raw material is placed between the polyethylene raw materials by electrostatic repulsion and attraction acting between the charged polyethylene raw material and the compounding raw material.
This will be described in detail as follows.
a) Preparation of raw materials
Low-density and linear low-density polyethylene resin and a compounding agent, respectively.
In order to form the packaging film of the present invention, a low-density polyethylene resin, a linear low-density polyethylene resin and a compounding agent are used, and the materials are subjected to a charging treatment before putting the raw materials into a molding process.
[1] polyethylene resins
First, 2.0 to 2.5 parts by weight of a conductive material is added to 100 parts by weight of powdery low density and linear low density polyethylene resin (hereinafter referred to as "polyethylene raw material") and coated by heat treatment.
The conductive material may be a known material, for example, a powder such as graphite may be used, or a coating liquid containing a conductive ITO (Indium Tin Oxide) or a conductive polymer such as polyaniline or polypyrrole may be used But is not limited thereto.
The polyethylene material mixed with the conductive material (coating solution) is heated at 150 ° C for the first time, and is then heated at a temperature of 110 ° C by decreasing the temperature by 10 ° C every 20-30 minutes. Thus, a conductive material is added to the polyethylene material in a molten state The positive charge is formed by compounding, and the hardness is increased.
At this time, as the melt viscosity of the heat-treated polyethylene raw material is increased by the coating solution, the melt rate (MI) is lowered to about 50% each, so that the feed rate in the extrusion process to be described later can be controlled. The molecular structure of the obtained film can be stabilized.
In addition, in this step, the polyethylene raw material is subjected to the positive charge and the compound raw material is subjected to the negative charge, but it is also possible to treat the polyethylene raw material so as to charge the opposite sign.
[2] compounding agents
2.0 to 2.5 parts by weight of a liquid conductive material is added to 100 parts by weight of a compounding agent in powder form (hereinafter referred to as "compounding material") and coated without heat treatment.
The conductive material may be a known coating liquid such as liquid ITO (Indium Tin Oxide) having excellent adhesion and moisture resistance, and other conductive materials capable of being charged can be used.
The compounding raw material in which the conductive material is mixed is uniformly kneaded at room temperature so that the liquid conductive compound is uniformly mixed and dispersed in the compounding raw material so as to be electrostatically bonded to the polyethylene raw material so as to form a negative charge.
At this time, the compounding material is controlled to have a low melt index by the coating liquid as in the case of the polyethylene material, and the melt index of the compounding material reaches about 70% with respect to the polyethylene raw material.
b) Formulation (layer separation)
A step of blending and separating the charged polyethylene raw material and the compounding raw material.
Unlike the conventional method of uniformly stirring a resin material as a base and an additive such as a stabilizer or a plasticizer, in the present invention, a method of blowing air from a lower portion in the process of compounding a polyethylene material and a compounding material in a mixing tank The polyethylene material and the compounding material starting from the low density / linear low density polyethylene resin which have been mixed with each other are moved upward, and then they are accumulated in the upper layer due to the difference in specific gravity.
Thus, it is possible to supply the raw material more accurately in the extrusion molding step which will be described later.
c) Extrusion molding
And extruding the layered polyethylene raw material and the compounding raw material.
Unlike the conventional method in which a polyethylene resin and an ultraviolet shielding resin are melted and softened by using a plurality of extruders and then multi-layered simultaneously with a T-die, the polyethylene raw material and the compounding raw material are fed through a single extruder One-layer is extruded in the form of a film having a thickness of 100 to 150 mu m.
For this purpose, each feedstock is transferred from the compounding tank to the hopper. Since each feedstock is in a state of being separated in the compounding tank, it is possible to feed the precise amount to the hopper. The content is 17 to 27% by weight of low density polyethylene, 70 to 80% by weight and 2.5 to 3.5% by weight of a compounding agent.
The polyethylene raw material and the compounding raw material fed into the extrusion process are continuously extruded through screw rotation. At this time, the polyethylene raw material and the compounding raw material can be extruded more smoothly as the melt index is controlled to be lower, Is higher than that of the compounding raw material, the rate of injection is fast.
In addition, in the process of extruding the raw material, an electric repulsive force is applied between the polyethylene raw materials charged with positive charges, and they are pushed out with each other. On the other hand, since the compounding raw material with a negative charge is bonded by electrostatic attraction, And the polyethylene material is arranged in the upper and lower portions.
d) cooling
And cooling the film having the predetermined thickness after the extrusion molding is completed, whereby the packaging film according to the present invention can be obtained.
For reference, general components and physical properties of the packaging film of the present invention are shown in Table 1 below.
In addition, the packaging film produced by the above-mentioned method is a method for producing packaging films having improved durability and prolonged life, such as building materials such as tiles, cereal powder bags or ramen noodles, and various raw materials and products such as processed foods Pallet, and packaging. The film for packaging does not easily discolor from external environment such as ultraviolet ray, protects the internal raw materials and products, and can be extended in life, so that quality improvement can be expected .
100: substrate layer 200: Compounding layer
Claims (7)
A compounding layer formed by mixing a compounding agent having a molecular formula (C 15 H 25 NO 4 ) n with a stabilizing agent having a molecular formula (C 35 H 66 N 8 ) n and disposed between the two side substrate layers;
Wherein the film is formed in a single layer structure.
Wherein the low-density polyethylene is 17 to 27% by weight, the linear low-density polyethylene is 70 to 80% by weight, and the compounding agent is 2.5 to 3.5% by weight.
b) separating the charged polyethylene raw material and the compounding raw material by a specific gravity difference; And
c) extrusion molding such that an electrostatic repulsive force acting between the polyethylene raw materials and an electrostatic attractive force acting between the polyethylene raw material and the compounding raw material act so that the polyethylene raw material is arranged at the upper and lower portions of the compounding raw material,
The polyethylene material is composed of a low density polyethylene resin and linear low-density polyethylene resin, the compounding ingredient material is a material having the n molecular formula (C 15 H 25 NO 4) compounding agents with a molecular formula with n (C 35 H 66 N 8 ) And the durability is improved and the life of the packaging film is prolonged.
In the step a), the polyethylene material mixed with the conductive material is heated at 150 ° C for the first time, and is lowered by 10 ° C at intervals of 20 to 30 minutes. While adjusting the temperature, the conductive material is compounded And the durability is improved and the service life is prolonged.
Wherein the polyethylene material and the compounding material are coated with a conductive material so that the melt index is controlled to be low in the step a), thereby improving the durability and prolonging the life of the packaging film.
A method for producing a packaging film having improved durability and having an extended life span, characterized in that, in the step (b), layer separation is carried out by blowing air from below to the low density polyethylene resin, the linear low density polyethylene resin and the compounding material .
Wherein the low density polyethylene resin is used in an amount of 17 to 27% by weight, the linear low density polyethylene resin is used in an amount of 70 to 80% by weight and the compounding material is used in an amount of 2.5 to 3.5% by weight in the step c) Of the film for packaging.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150066873A KR20160133833A (en) | 2015-05-13 | 2015-05-13 | Packaging film with increased durability and elongated lifetime and method for manufacturing the same |
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| KR1020150066873A KR20160133833A (en) | 2015-05-13 | 2015-05-13 | Packaging film with increased durability and elongated lifetime and method for manufacturing the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101967911B1 (en) | 2018-04-10 | 2019-08-19 | 손남주 | Damper apparatus using a motor |
| KR20200001712U (en) | 2019-01-23 | 2020-07-31 | 강석현 | Assembly type footing board |
| KR102652390B1 (en) | 2023-11-28 | 2024-03-28 | 김동규 | Manufacturing method of flexo and gravure water-based ink for food packaging film |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010080400A (en) | 1998-11-10 | 2001-08-22 | 데이비드 엠 모이어 | A film with UV-barrier properties |
| KR20010083452A (en) | 2000-02-15 | 2001-09-01 | 오현혁 | Contraction film intercepted ultrariolet rays for packing |
| KR100359986B1 (en) | 1999-11-19 | 2002-11-08 | 금정산업 주식회사 | A Resin Composition of Shirinking Film and Sheet for Shutting out UV |
| KR100519401B1 (en) | 2004-05-19 | 2005-10-06 | (주)청암산업 | Plastic film for shielding ultraviolet ray and heat |
| KR100586488B1 (en) | 2005-05-24 | 2006-06-07 | 금정산업 주식회사 | Packing film for intercept of ultraviolet rays and near infrared rays |
-
2015
- 2015-05-13 KR KR1020150066873A patent/KR20160133833A/en active IP Right Grant
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010080400A (en) | 1998-11-10 | 2001-08-22 | 데이비드 엠 모이어 | A film with UV-barrier properties |
| KR100359986B1 (en) | 1999-11-19 | 2002-11-08 | 금정산업 주식회사 | A Resin Composition of Shirinking Film and Sheet for Shutting out UV |
| KR20010083452A (en) | 2000-02-15 | 2001-09-01 | 오현혁 | Contraction film intercepted ultrariolet rays for packing |
| KR100519401B1 (en) | 2004-05-19 | 2005-10-06 | (주)청암산업 | Plastic film for shielding ultraviolet ray and heat |
| KR100586488B1 (en) | 2005-05-24 | 2006-06-07 | 금정산업 주식회사 | Packing film for intercept of ultraviolet rays and near infrared rays |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101967911B1 (en) | 2018-04-10 | 2019-08-19 | 손남주 | Damper apparatus using a motor |
| KR20200001712U (en) | 2019-01-23 | 2020-07-31 | 강석현 | Assembly type footing board |
| KR102652390B1 (en) | 2023-11-28 | 2024-03-28 | 김동규 | Manufacturing method of flexo and gravure water-based ink for food packaging film |
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