KR20240043244A - Cargo cover - Google Patents

Abstract

According to the present invention, moisture generated inside the air cargo can be absorbed and retained in the non-woven fabric layer (Nb) after passing (permeable) through the nanomembrane layer (Na) of the inner layer (N) and the moisture of the outer layer (T). The aluminum-containing polyethylene woven layer (Ta) minimizes the temperature gap between the inside and the outside while preventing mold growth, waterproofing, impact resistance, heat reflection, heat insulation, and even tensile strength, even if bending or creasing occurs during the process of wrapping air cargo. It is manufactured on the basis of a masterbatch prepared by mixing, extruding and cutting polyethylene resin and aluminum powder with a dispersant and anti-blocking agent (made into flat yarn, etc. using the masterbatch as a base) and through an aluminum-containing polyethylene woven layer (Ta). This is an invention of a cargo cover that completely eliminates the phenomenon of self-cracking and ensures the complete preservation of air cargo.

Description

Cargo Cover{CARGO COVER}

The present invention relates to a cargo cover, and more specifically, to a cargo cover that can completely protect against the effects of temperature and humidity during long-term transportation of air cargo.

In general, air cargo is cargo transported by aircraft and exists in a variety of ways, from industrial products to agricultural products, marine products, and even pharmaceuticals.

For example, in the case of air cargo for agricultural products such as fruit, marine products such as fish and shellfish, and pharmaceuticals such as bio, vaccines, etc., where freshness is important, a cold chain at an appropriate temperature must be maintained, and in this case, packaging prepared by the transporter After setting the box on the pallet, it is covered with a cargo cover to optimally maintain humidity and temperature, minimizing the impact of internal and external temperature differences.

Figure 1 is a photograph of a general air cargo being wrapped with a wrap.

In general, air cargo transported on a pallet (10) is wrapped with a wrap (20) as shown in Figure 1 in order to maintain the appropriate temperature to enable long-term transportation. In this case, the air cargo and wrap (20) There is a problem in that moisture and condensation is generated due to the difference in internal and external temperatures, causing adverse effects.

In order to solve this problem, Republic of Korea Patent Publication No. 1975118 (Cargo Cover for Air Cargo Pallet) has been proposed as a prior art document.

Figure 2a is a photograph taken of the state of use of the cargo cover for an air cargo pallet according to the prior art document, Figure 2b is a side view showing the state of use of the cargo cover for an air cargo pallet according to the prior art document, and Figure 2c is a prior art document. It is an enlarged cross-sectional view of the main part showing the cargo cover for an air cargo pallet according to the literature, and Figure 2d is a schematic diagram for explaining the function of the cargo cover for an air cargo pallet according to the prior art literature.

The cargo cover 100 for an air cargo pallet according to prior art literature may be composed of a base cover 110 and a top cover 120, and the base cover 110 covers the lower part of the air cargo placed on the pallet 10. And the top cover 120 covers the upper part of the air cargo and surrounds the entire base cover 110.

At this time, the cargo cover 100 for an air cargo pallet according to the prior art literature is maintained at a room temperature storage temperature of 15 to 25°C to prevent internal condensation, and its cross section is composed of an inner layer and an outer layer, The inner layer consists of a nanomembrane layer, a non-woven fabric layer, and a metal coating layer made of aluminum foil for heat protection. Here, the nanomembrane layer and the non-woven fabric layer prevent internal condensation.

In other words, the moisture generated inside the cargo cover 100 for air cargo pallets in the prior art literature passes through the nanomembrane layer (permeability) and is then absorbed into the non-woven fabric layer, thereby preventing condensation by performing a waterproofing function for the contained moisture. At the same time, the moisture contained in the non-woven fabric layer is blocked from moving to the outer layer with a metal coating layer made of aluminum foil, thereby maintaining the internal humidity at a certain level.

At this time, the non-woven layer not only absorbs and retains moisture to prevent condensation, but also performs a heat barrier function for the inside and outside to maintain the inside temperature at room temperature.

In addition, the outer layer and the inner layer can be bonded to each other by heat bonding, adhesive bonding, etc., and the outer layer includes a polyethylene woven film made of polyethylene flat yarn and a polyethylene coating layer coated on the polyethylene woven film. The polyethylene woven film and polyethylene coating layer are responsible for waterproofing and at the same time increase mechanical strength.

The density of polyethylene making up the polyethylene woven film may be higher than the density of polyethylene making up the polyethylene coating layer. For example, the woven polyethylene film is made of HDPE (High Density Polyethylene), which has high mechanical strength, and the polyethylene coating layer is made of LDPE (Low Density Polyethylene), which is a dramatically improved mechanical feature compared to the general wrapping method or the existing cargo cover that mainly consists of a non-woven layer. It can provide strength and recyclability.

Meanwhile, at least one of the polyethylene woven film and the polyethylene coating layer may include at least one of a light blocker and a heat blocker and may function to block the internal temperature from rising. And the outer layer further includes a fluororesin layer bonded or coated with the polyethylene coating layer to provide the effect of blocking external heat and chemical resistance.

However, the cargo cover 100 for an air cargo pallet according to the prior art literature has a metal coating layer on the inner layer bonded to the outer layer for heat protection, and this metal coating layer is made of none other than aluminum foil.

When covering or peeling off air cargo, the aluminum foil itself is easily bent or cracked, which ultimately leads to damage and cracks. This causes heat protection by passing the internal and external temperature and humidity through the gap, that is, passing through the inner and outer layers. In addition to making it difficult, it also causes condensation, creating problems that have a negative impact on air cargo.

Republic of Korea Patent Publication No. 1975118 Republic of Korea Patent Publication No. 2084335

The purpose of the present invention is to completely protect air cargo from the effects of temperature and humidity during long-term transportation of air cargo. In particular, moisture generated inside the air cargo passes through the nanomembrane layer of the inner layer (moisture permeability) and then is absorbed into the non-woven fabric layer. The process of covering air cargo by ensuring that it can be absorbed and retained, and that the temperature gap between the inside and outside is minimized by the aluminum-containing polyethylene woven layer of the outer layer, while preventing mold growth, waterproofing, impact resistance, heat reflection, heat insulation, and tensile strength. Even if bending or creasing occurs in air cargo, the phenomenon of self-cracks is thoroughly eliminated through the aluminum-containing polyethylene woven layer produced based on a masterbatch prepared by kneading, extruding and cutting polyethylene resin and aluminum powder with dispersant and anti-blocking agent. The goal is to provide a cargo cover that ensures the complete preservation of the product.

The present invention to achieve the above object,

In the cargo cover, which consists of an inner layer and an outer layer and protects air cargo placed on a pallet,

The inner layer includes a nanomembrane layer that allows moisture generated inside the air cargo to pass through, and a nonwoven layer bonded to the outside of the nanomembrane layer to absorb and retain moisture that has passed through the nanomembrane layer,

The outer layer is manufactured based on a masterbatch prepared by mixing, extruding and cutting polyethylene resin, aluminum powder, dispersant and anti-blocking agent, and is attached to the non-woven fabric layer of the inner layer to prevent mold growth, waterproof, heat reflection, heat insulation and tensile strength. The basic feature of its technical composition is that it includes an aluminum-containing polyethylene woven layer that guarantees.

The present invention has the effect of completely protecting the air cargo from the effects of temperature and humidity during long-term transportation.

According to the present invention, moisture generated inside the air cargo can be absorbed and retained in the non-woven fabric layer after passing through the nanomembrane layer of the inner layer (water permeability), and the temperature gap between the inside and outside is reduced by the aluminum-containing polyethylene woven layer of the outer layer. By minimizing mold growth, waterproofing, impact resistance, heat reflection, heat insulation, and even tensile strength, we mix and extrude aluminum powder with polyethylene resin, dispersant, and anti-blocking agent even if bends or creases occur during the process of covering air cargo. The aluminum-containing polyethylene woven layer produced based on the masterbatch prepared by cutting has the effect of completely eliminating the phenomenon of self-cracks and realizing the intact preservation of air cargo.

The present invention is a tarpaulinization using polyvinyl chloride resin, which has the effect of maximizing flexibility, toughness, and waterproofing function to more thoroughly eliminate condensation due to the gap between internal and external temperatures.

Figure 1 is a photograph of a general air cargo being wrapped with wrap.
Figure 2a is a photograph taken of the use state of a cargo cover for an air cargo pallet according to prior art literature.
Figure 2b is a side view showing the use state of a cargo cover for an air cargo pallet according to prior art literature.
Figure 2c is an enlarged cross-sectional view of the main part showing a cargo cover for an air cargo pallet according to prior art literature.
Figure 2d is a schematic diagram for explaining the function of a cargo cover for an air cargo pallet according to prior art literature.
Figure 3 is an image showing a cargo cover according to the present invention.
Figure 4 is an enlarged cross-sectional view showing the cargo cover according to the present invention.
Figures 5a and 5b are test reports of the cargo cover according to the present invention tested at the FITI Testing Institute.
Figure 6 is a test report of a cargo cover according to the present invention tested at the Korea Apparel Testing & Research Institute.

Preferred embodiments of the cargo cover according to the present invention will be described with reference to the drawings. There may be a plurality of embodiments, and through these embodiments, the purpose, features and advantages of the present invention can be better understood. do.

Figure 3 is an image showing the cargo cover according to the present invention, Figure 4 is an enlarged cross-sectional view of the main part showing the cargo cover according to the present invention, and Figures 5a and 5b are tests of the cargo cover according to the present invention at the FITI Testing Institute. This is a report, and Figure 6 is a test report of a cargo cover according to the present invention tested at the Korea Apparel Testing & Research Institute.

Air cargo can deteriorate and deform when affected by temperature during long flights, so the cold chain (a means of temperature control in American cities to maintain an appropriate storage temperature for air cargo) is used to reduce the influence of temperature during flight. It must be possible to maintain safe preservation without receiving it.

Accordingly, the air cargo placed on the pallet (P) must be covered with a cargo cover to minimize the internal and external temperature gap, that is, to insulate it. However, in the prior art literature, aluminum foil is applied as the metal coating layer for thermal protection, so it cannot be wrinkled or bent. When the aluminum foil itself cracks or is easily damaged, the ultimate purpose of temperature preservation through a cold chain is not achieved due to passing of internal and external temperature and humidity, and condensation occurs, resulting in the problem of not being able to maintain the safe preservation of air cargo. It was confirmed that it exists.

As shown in FIGS. 3 and 4, the cargo cover according to the present invention is basically composed of an inner layer (N) and an outer layer (T) to protect the air cargo placed on the pallet (P) by surrounding it.

At this time, the inner layer (N) is bonded to the nanomembrane layer (Na), which allows moisture generated inside the air cargo to pass through, and the outside of the nanomembrane layer (Na), to absorb and retain moisture that has passed through the nanomembrane layer (Na). It includes a non-woven layer (Nb), and the outer layer (T) is manufactured based on a masterbatch prepared by mixing, extruding, and cutting polyethylene resin, aluminum powder, dispersant, and anti-blocking agent (using the masterbatch as a base and making flat yarn, etc.) The core component includes an aluminum-containing polyethylene woven layer (Ta) that is attached to the non-woven layer (Nb) of the inner layer (N) while being manufactured and ensures mold prevention, waterproofing, heat reflection, heat insulation, and tensile strength.

The cargo cover according to the present invention can also be maintained at 15 to 25°C, which is the room temperature storage temperature for air cargo, and especially prevents internal condensation, and its cross section is divided into an inner layer (N) and an outer layer (T). It can be configured.

At this time, the inner layer (N) is composed of a nanomembrane layer (Na) and a non-woven fabric layer (Nb), but a metal coating layer made of aluminum foil as in the prior art literature is not applied due to problems with cracks and cracks.

Accordingly, the moisture generated inside the air cargo can be absorbed and retained in the non-woven fabric layer (Nb) after passing through the nanomembrane layer (Na) of the inner layer (N) (water permeability), and the aluminum-containing layer of the outer layer (T). The polyethylene woven layer (Ta) minimizes the temperature gap between the inside and outside while preventing mold growth, waterproofing, impact resistance, heat reflection, heat insulation, and tensile strength. Even if bending or creasing occurs during the covering of air cargo, the polyethylene resin is used. In addition, the aluminum-containing polyethylene woven layer (Ta) produced on the basis of a masterbatch prepared by mixing, extruding and cutting aluminum powder with a dispersant and anti-blocking agent is used to completely eliminate the phenomenon of self-cracks, thereby realizing the intact preservation of air cargo. It was done.

At this time, the masterbatch further contains polyvinyl chloride resin in addition to polyethylene resin, aluminum powder, dispersant and anti-blocking agent, and allows moisture generated inside the air cargo to pass through the nanomembrane layer (Na) of the inner layer (N) and the inner layer. Absorbs and retains moisture through the non-woven layer (Nb) of (N) and further ensures waterproofing, mold prevention, impact resistance, heat reflection, heat insulation and tensile strength through the outer layer (T), as well as tarpaulin through polyvinyl chloride resin. By maximizing flexibility, toughness, and waterproof function, it is possible to more thoroughly eliminate condensation due to the gap between internal and external temperatures.

Specifically, the masterbatch contains 80 to 93 wt% of polyethylene resin, 4 to 18 wt% of aluminum powder, 2 to 8 wt% of polyvinyl chloride resin, 0.5 to 1 wt% of dispersant, and 0.5 to 1 wt% of antiblocking agent. It is prepared by mixing, extruding and cutting.

Polyethylene resin can be manufactured by classifying crude oil, separating the naphtha portion, decomposing this to collect ethylene, and then polymerizing this ethylene. Depending on the polymerization method, it can be distinguished into low-density polyethylene and high-density polyethylene, In the present invention, high-density polyethylene resin is applied to utilize flexibility, tensile strength, and hard properties to prevent damage and toughness when covering air cargo. Below 80 wt%, flexibility and tensile strength are weak and undesirable, and above 93 wt%. In this case, the content of aluminum powder is relatively reduced, making it undesirable.

Aluminum powder is used with particles of 10 to 100㎛. If the aluminum powder particles are less than 10㎛, heat reflection efficiency is low, and if the particles are more than 100㎛, there is a problem with compatibility when kneading with polyethylene resin. Specifically, it ensures that it can be mixed without causing a sense of heterogeneity when training with polyethylene resin, while ensuring heat protection and mold prevention due to heat reflection, as well as internal heat reflection as well as external heat reflection of air cargo, and side heat insulation. This helps eliminate condensation due to the temperature gap between the inside and outside. If it is less than 4wt%, the efficiency of heat reflection decreases, and if it is more than 18wt%, it causes a feeling of heterogeneity when training with polyethylene resin, which is undesirable.

Polyvinyl chloride resin is synthesized into polyethylene resin and converted into tarpaulin, making it flexible and strengthening the waterproof function while blocking the passage of internal and external humidity of air cargo. If it is less than 2wt%, the content synthesized in polyethylene resin is insufficient. The waterproof function is low and if it is more than 8wt%, the content of polyethylene resin is relatively small, making it undesirable.

The dispersing agent is used to disperse and uniformly mix polyethylene resin, polyvinyl chloride resin, and aluminum powder when training each other. Ethylene vinyl acetate or polyvinyl alcohol can be used. If the content is less than 0.5 wt%, the dispersing effect is reduced, and if it is less than 1 wt%, the dispersing agent is used to disperse the polyvinyl chloride resin and aluminum powder. If it is above this, the physical properties become too soft, which is not desirable.

The anti-blocking agent is used to achieve uniform mixing while preventing agglomeration between polyethylene resin, polyvinyl chloride resin, and aluminum powder during training. Any one of calcium carbonate, barium sulfate, and titanium dioxide can be applied. If it is less than 0.5wt%, the anti-blocking effect is reduced, and if it is more than 1wt%, the physical properties become too soft, which is not desirable.

In addition, the outer layer (T) further includes a polyethylene coating layer (Tb) laminated to the outside of the aluminum-containing polyethylene woven layer (Ta), and preferably a low-density polyethylene coating layer (Tb) is further provided to further improve waterproofing and flexibility. Reinforce it.

<Example 1>

The cargo cover of the present invention was compared with Tyvek (synthetic high-density polyethylene (HDPE) fiber developed by DuPont, USA) in terms of mass, tensile strength, tensile elongation, reflectivity, thermal conductivity, and thermal insulation. It was relatively excellent as shown in Table 1 below.

[Table 1]

<Example 2>

Cargo cover of the present invention - temperature test

1) Test standard: ISTA Procedure 7D: 2017 SUMMER PROFILE

2) Test temperature: (22~35)℃

3) Temperature change rate: 1℃/min

4) Test time: 24h

5) Test conditions (Table 2 below)

[Table 2]

6) Test method (Graph 1 below)

[Graph 1]

① Before testing, PCM (phase change material, ice pack) is pretreated at 5℃ for 24 hours.

② Install the test item inside the tester and conduct the test according to the picture.

③ Check the temperature inside the cover using a wireless thermometer.

④ After the test, check the external appearance of the test product and the internal temperature of the cover.

- How to measure temperature

Measurement location: Inside top/middle/bottom of the cargo cover of the present invention

- Test judgment

Judgment: COVER internal temperature maintained below (15∼25)℃

As such, the test results related to the mass, tensile strength, tensile elongation, reflectance, thermal conductivity, and thermal insulation of the cargo cover of the present invention are excellent, as can be seen from the test results of the FITI Testing Institute in Figures 5a and 5b and the Korea Apparel Testing Institute in Figure 6. And, as in Example 1, it was confirmed that it had relative advantages by comparing Tyve from DuPont, USA.

The present invention can be used in the industrial field to ensure safe transportation of air cargo during long flights.

P: Pallet
N: inner layer
Na: Nanomembrane layer
Nb: non-woven layer
T: outer layer
Ta: Aluminum-containing polyethylene woven layer
Tb: polyethylene coating layer

Claims (6)

In the cargo cover, which consists of an inner layer (N) and an outer layer (T) and protects air cargo placed on a pallet (P),
The inner layer (N) is bonded to a nanomembrane layer (Na) that allows moisture generated inside the air cargo to pass through, and to the outside of the nanomembrane layer (Na) to absorb moisture that has passed through the nanomembrane layer (Na). It includes a nonwoven layer (Nb),
The outer layer (T) is manufactured based on a masterbatch prepared by mixing, extruding and cutting polyethylene resin, aluminum powder, dispersant and anti-blocking agent, and is attached to the non-woven fabric layer (Nb) of the inner layer (N) to prevent mold growth, A cargo cover comprising an aluminum-containing polyethylene woven layer (Ta) that ensures waterproofing, heat reflection, heat insulation, and tensile strength. According to paragraph 1,
A cargo cover characterized in that the masterbatch further includes polyvinyl chloride resin. According to paragraph 2,
The masterbatch contains 80 to 93 wt% of the polyethylene resin, 4 to 18 wt% of the aluminum powder, 2 to 8 wt% of the polyvinyl chloride resin, 0.5 to 1 wt% of the dispersant, and 0.5 to 1 wt% of the above. A cargo cover, characterized in that prepared by mixing, extruding and cutting the anti-blocking agent. According to paragraph 1,
The outer layer (T) is a cargo cover characterized in that it further includes a polyethylene coating layer (Tb) laminated on the outside of the aluminum-containing polyethylene woven layer (Ta). According to paragraph 3,
A cargo cover, characterized in that the aluminum powder of the masterbatch has a size of 10 to 100㎛. According to any one of claims 1 to 5,
The dispersant is ethylene vinyl acetate or polyvinyl alcohol,
Cargo cover, characterized in that the anti-blocking agent is any one of calcium carbonate, barium sulfate, and titanium dioxide.