WO2016114564A2 - Shock-absorbing pack - Google Patents

Abstract

The present invention relates to a shock-absorbing pack and, more specifically, to a shock-absorbing pack that is completed by preparing an outer cover material satisfying a Gurley air permeability of 1 to 100 seconds, measured according to ASTM D726, as an outer cover and filling the interior with a filling material having a restoring force. Disclosed is the shock-absorbing pack that is configured by: preparing an outer cover material satisfying a Gurley air permeability of 1 to 100 seconds, measured according to ASTM D726, as an outer cover; cutting the outer cover material in a predetermined size of rectangular shape; applying or attaching a room temperature setting adhesive, a thermosetting adhesive, or a double-sided adhesive tape with a predetermined width on the distal end of one side surface with respect to the longitudinal central axis; fixedly attaching one longitudinal distal end and an end surface parallel to the central axis such that one side is open; and turning the outer cover material inside out such that the adhesion part is located inside and filling a filling material through an opening.

Description

Shock Absorbing Packaging

The present invention relates to a shock-absorbing packaging material, and more specifically, to a shell material having a Gurley air permeability of 1 to 100 seconds as measured according to ASTM D726, and filling a filler having a circular recovery force therein. It relates to a cushioning packaging material is completed.

Generally, when packaging electronic products, cultural properties, etc. in a box, a cushioning material such as styrofoam is mainly used to prevent damage or damage to a product due to external impact or internal electric power.

However, since these buffers are very large, they prevent the efficient use of space when carrying out logistics activities such as storage, loading, and transportation, while increasing costs, and since they cannot be recycled and disposed of as they are, they are used to pollute the environment. This is causing problems.

Therefore, in recent years, a plurality of plastic films or sheets are fused to form an air cell therein, and a cushioning packing material in which the air is filled in the air cell and expanded is used to replace styrofoam.

Such a cushioning packaging material is interposed between a pair of envelopes, which form a plurality of air induction paths using a release band, between a pair of envelopes, and each of the pair of envelopes and a pair of endothelials are fused to each other to induce one air induction. A plurality of air cells having a furnace are formed by tongue, and are formed by fusion and inflate air into an air injection passage communicating with a plurality of air induction paths to expand the plurality of air cells.

However, such a conventional shock absorbing packaging material is formed in the air inlet air flow path, the fusion process for forming the air induction path and the fusion process for forming the air cell and the air injection path must be carried out separately. Therefore, a mold for forming an air induction path, and a mold for forming an air cell and an air injection path must be provided, respectively, and work efficiency is deteriorated. There is also a problem that the manufacturing cost is increased because the use of expensive film with little deformation occurs.

In addition, the air cell is pressurized by the object for shock shock to cause wrinkles or tearing in the air induction, and the air filled in the air cell is minutely flowed back through the air induction to be lost and thus have a buffering effect. There is also a problem that is reduced.

On the other hand, in the case of cultural properties are very sensitive to moisture, the use of the cushioning packaging material made of the plastic film is not made, in the case of cultural properties by filling cotton cotton inside the packaging material made of a paper material such as neutral paper, etc. I use a cushioning packing material called cotton. However, in the case of the cotton is made of a paper material, a lot of dust is accumulated, very weak to moisture there is a problem that contamination such as mold when left for a long time.

In addition, in the case of cotton cotton filled inside there is a problem that can not act as a packaging material due to the natural corrosion after a long time, the cotton cotton has a problem that the buffer effect is reduced by the volume is reduced by the external pressure. . In addition, the paper material such as Hanji, which is used, has a problem in that the fine pores are too large and the fine dust of the corroded filler is released to the outside to provide a cause of contamination of the packaging material.

Particularly, in the case of cotton fabric composed of neutral paper, the physical and chemical properties change relatively easily due to the external environment, and thus, the temperature, humidity mitigation ability, chemical stability, vibration and impact mitigation ability are remarkably deteriorated with time. This may cause damage to the packaging materials.

Therefore, it is necessary to discover a material having both superiority of plastic film and superiority of neutral paper and development of a new buffer packaging material manufactured from the material.

The present invention has been made to solve the above problems of the prior art, at the same time meets the advantages of conventional plastic film and neutral paper, temperature and humidity alleviating ability, chemical stability, vibration and shock alleviating ability and economic efficiency and user It is a problem to provide a cushioning packaging material with increased convenience.

The present inventors have a thin thickness and excellent rupture strength when the outer skin material having a Gurley-hill value of 1 to 100 seconds is used as the outer skin, and the outer skin material has a fine pore less than 10 μm. It is possible to obtain a non-woven fabric having flexibility such as neutral paper while permeating a certain amount of air, having excellent water repellency that is not absorbed by external exposure such as fine dust, moisture in the air or liquid introduced from the outside, etc. The present invention was completed by knowing that a buffer packaging material having very simple physical properties can be manufactured.

The cushioning packaging material of the present invention that solves the above problems is the outer skin material satisfying 1 to 100 seconds Gurley air permeability measured according to ASTM D726, the outer skin material in a rectangular shape to a constant size After cutting, apply or apply a room temperature-curable adhesive, a thermosetting adhesive, or a double-sided adhesive tape with a predetermined width at one end of the longitudinal central axis, and then apply one longitudinal end portion and a horizontal end surface parallel to the central axis. Attached and fixed so that one side is opened, the adhesive is turned upside down to be located inside, and is characterized by being configured to fill the filler through the opening.

Here, the shell material is characterized in that the emboss is further formed in the longitudinal direction on the outer surface.

Here, the skin material is characterized in that the material is made by further forming a micro-pore by using a needle after softening.

Here, the outer material is a flash spinning nonwoven fabric, a spunlace nonwoven fabric, a stitch nonwoven fabric, a hydroentangled nonwoven fabric, a dry-laid nonwoven fabric, a meltblown nonwoven fabric, a needle punched nonwoven fabric, a resin punched nonwoven fabric, and a resin adhesive bond. (resin-bonded) nonwovens, spun-bonded nonwovens, thermally bonded (woven) nonwovens (wet-laid) nonwovens or a combination thereof.

Here, the skin material is characterized in that it is electrostatically charged.

Here, the outer material is characterized in that the non-woven web by spinning high-density polyethylene fibers heat-bonded with a heating roller and then corona treatment (electro-flame discharge treatment), the antistatic treated high-density polyethylene nonwoven fabric.

Here, the shell material is any one of a nonwoven fabric bonded from the consolidated fibrous polyolefin sheet, a nonwoven fabric made of spunbonded polypropylene fiber sheet, a composite of a melt blown polypropylene fiber web and a spunbonded polypropylene fiber sheet. It is done.

Here, the skin material is characterized in that the skin material has a pore size of 0.1 ~ 10㎛ measured according to the bubble point method.

Here, the filler is characterized in that the cotton is manufactured so that the internal porosity is 30 ~ 70% by spinning the synthetic fibers in an amorphous form.

Here, the filler is characterized in that the cotton formed by spinning at least one selected from the group consisting of polyester yarn filament, rayon filament, polyester yarn filament, rayon filament, microfiber filament amorphous. .

The cushioning packaging material provided by the present invention has very good physical properties such as low air permeability, high waterproofness, high oxidation resistance, high burst strength, and has excellent temperature and humidity relaxation ability, chemical stability, vibration and shock alleviation ability.

In addition, the cushioning packaging material according to the present invention is a skin material by using a skin material formed with micropores satisfying 1 to 100 seconds Gurley air permeability measured according to ASTM D726, the micropores formed on the skin material External air is introduced through the filling, and the filled filler has a circular recovery elastic force, and has a property of swelling to have an original thickness even when it is contracted by external pressure, and has excellent cushioning effect due to the elastic recovery peculiar to synthetic fibers. It has the advantage of firmly holding the packaged product, and has a very good resistance to the external physical environment such as moisture, shock, etc., and has a very good effect to protect the packaged product.

1 and 2 is a process chart showing an example of the manufacturing process of a high-density polyethylene nonwoven fabric which is an example of the shell material constituting the present invention.

Figure 3 is a block diagram showing a process for processing the cushioning packaging material of the present invention.

4 is a process chart showing an example of a process of processing the cushioning packaging material of the present invention.

Figure 5 is a scanning electron micrograph comparing the surface of the high-density polyethylene nonwoven fabric and neutral paper used in one embodiment of the present invention.

6 is a cross-sectional view of the cushioning packaging material of the present invention.

Figure 7 is a photograph of dust generation comparison test data of the cushioning packaging material of the present invention and a conventional packaging using neutral paper.

<Description of Drawing>

10: nonwoven web 20: pressing roller

30: winding roller 40: heating roller

42: emboss roller 50: antistatic treatment

52: corona processor 60: softener

62: fine needle needle 64: fine needle hole forming member

70: feed roller 80: take-up roller

90: high density polyethylene nonwoven fabric 100: nonwoven fabric

110: edge 120: adhesive portion

130: adhesive side 140: opening

150: interior space 160: filling material

200: cushioning packaging

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are process diagrams showing an example of the manufacturing process of a high-density polyethylene nonwoven fabric which is an example of the shell material constituting the present invention, Figure 3 is a block diagram showing a process of processing the buffer packaging material of the present invention. 4 is a process chart showing an example of a process for processing a buffer packaging material of the present invention, Figure 5 is a scanning electron micrograph comparing the surface of the high-density polyethylene nonwoven fabric and neutral paper used in one embodiment of the present invention; 6 is a cross-sectional view of the cushioning packaging material constituting the present invention, Figure 7 is a photograph of the dust generation comparison test data of the cushioning packaging material of the present invention and a conventional packaging using neutral paper.

The cushioning packaging material according to the present invention is a packaging material made of a shell material having a Gurley air permeability of 1 to 100 seconds measured according to ASTM D726, the filling material is filled in the interior of the shell material. . At this time, the skin material may be a fibrous sheet or nonwoven fabric.

The buffer packaging material according to the present invention is composed of an outer skin material having a Gurley air permeability of 1 to 100 seconds measured according to ASTM D726, and the outer skin material is cut into a rectangular shape to a certain size. Apply or apply room temperature curing adhesive, thermosetting adhesive, or double-sided adhesive tape to one side end with a certain width, and then attach one longitudinal end part and a horizontal end face horizontally with the central axis. One side is opened, and the adhesive is turned upside down so as to be located inside, and the filler is filled through the opening.

According to the present invention, the shell material may be any material that satisfies the Gurley air permeability, such as fibrous sheet, nonwoven fabric, synthetic resin film.

Preferably, the outer material is a spunlace nonwoven fabric, a stitch nonwoven fabric, a hydroentangled nonwoven fabric, a dry-laid nonwoven fabric, a meltblown nonwoven fabric, a needlepunched nonwoven fabric, and a resin-bonded resin. A) nonwoven fabric, spun-bonded nonwoven fabric, thermal bonded nonwoven fabric, wet-laid nonwoven fabric, or a composite thereof.

The raw material of the nonwoven fabric may be made of various materials such as PP, PET, aramid fiber, cotton, nylon, acrylic fiber, polyolefin. The manufacturing method of the above-mentioned nonwoven fabric uses what was manufactured by the conventional well-known method.

The nonwoven fabric structure is not particularly limited within the range satisfying the Gurley air permeability of the present invention, but is composed of long fibers or staple fibers, such as needle punching method, thermal bonding method, hot air bonding method, hydroentanglement method, etc. It is manufactured by the spunbond method, the melt blown method, or the flash spinning method, which are prepared or directly spun, and can be used alone or in combination. The manufacturing process of the said nonwoven fabric is not specifically limited, According to the conventional method in the industry.

According to the present invention, the shell material may be heat-bonded nonwoven web spun by spinning high density polyethylene fibers with a heating roller, followed by corona treatment (electroflame discharge treatment), and then an antistatic treated high density polyethylene nonwoven fabric may be used.

In addition, the skin material may be any one of a nonwoven fabric bonded from a consolidated fibrous polyolefin sheet, a nonwoven fabric made of spunbond polypropylene fiber sheet, a composite of a melt blown polypropylene fiber web and a spunbonded polypropylene fiber sheet. .

According to the present invention, the envelope material may be further embossed constant in the longitudinal direction on its outer surface. At this time, the embossing is preferably a hemispherical embossing, the size, arrangement state, etc. are not limited to a large, it can be formed in a variety of modifications according to the operator's choice or the user's request.

According to the present invention, it is preferable to use a material in which the envelope material is formed by further softening a fibrous sheet or nonwoven fabric and then further forming micropores using a needle. At this time, the formation of the micropores should not be beyond the scope of the present invention, preferably, the formation of the micropores is formed so that the Gurley air permeability measured in accordance with ASTM D726 to satisfy 1 to 100 seconds. It is good to let.

According to the present invention, it is preferable to use the shell material that is electrostatically charged.

According to the present invention, it is preferable that the envelope material is an envelope material having a pore size of 0.1 to 10 μm measured by the bubble point method.

Hereinafter will be described with reference to Figures 1 to 6 an example of the manufacturing process of the buffer packaging material of the present invention by using a high-density polyethylene non-woven fabric which is one of those that can be used as the shell material of the present invention. The manufacturing process disclosed below is not limited to the present invention by way of illustration for explaining the present invention, and can be modified as much as possible without departing from the scope of the present invention.

1 and 2 illustrate an example of the manufacturing process of the high-density polyethylene nonwoven fabric used in the present invention, as shown in Figure 1, the nonwoven fabric is formed by spinning the high-density polyethylene fibers to form a nonwoven web 10, The nonwoven web 10 is crimped with a crimping roller 20 to maintain a predetermined thickness and wound up with a winding roller 30. The wound nonwoven web 10 is transferred to the heating roller 40 to be thermally bonded, and the thermally bonded nonwoven web 10 is transferred to the antistatic processor 50 to perform an antistatic treatment on the surface. At this time, the corona treatment 52 precedes the corona treatment of the non-woven web that is heat-bonded before being transferred to the antistatic treatment unit 50 and subjected to the antistatic treatment. The antistatic web treated by the antistatic treatment unit 50 is transferred to the softener 60 to soften, and the softened nonwoven web is transferred to the conveying roller 70 and wound by the final winding roller 80 to obtain high density polyethylene. The nonwoven fabric 90 is prepared.

On the other hand, as shown in Figure 2, after heat-bonding with the heating roller 40 of Figure 1, using the embossing roller 42 can be further embossed on the non-woven fabric at the same time as the thermal bonding, after softening, The final high density polyethylene nonwoven fabric may be completed by further forming fine needle holes using the fine needle hole forming member 64 provided with the fine needle needle 62 to form the micro voids.

Corona treatment and antistatic treatment as described above has the advantage of excellent adhesion.

Referring to Figures 3 and 4 an example of a process for producing a shock-absorbing packaging material of the present invention using the nonwoven fabric 90 prepared as described above,

After cutting the prepared nonwoven fabric to an appropriate size, the adhesive portion 120 using an adhesive or double-sided adhesive tape in a predetermined width to the edge 110 of one side of the cut nonwoven fabric 100 based on the longitudinal center axis (AA) To form. In this case, the adhesive used may be a room temperature curing adhesive or a thermosetting adhesive, and the double-sided adhesive tape may be used as long as the adhesive is excellent in adhesiveness.

As described above, the nonwoven fabric having the adhesive portion 120 formed at the edge is first bonded to one end and the central axis AA and the horizontal edge, and then the adhesive surface 130 is inverted so that the adhesive surface 130 is positioned inward. 140 to be formed, and prepares to form the inner space 150. Next, the filler 160 is filled in the inner space 150, and the adhesive part formed on one side of the opening 140 is adhered to the adhesive surface so as to be positioned therein to finish. In this way, the shock-absorbing packaging material 200 of the present invention is completed.

Looking at the cushioning packaging 200, as shown in Figure 6, the non-woven fabric 100 forms an outer shell, the edge portion bonded with an adhesive is located on the inside, the filler 160 is filled inside It is a composition.

At this time, the filler 160 used may be any of cotton so long as it is made of elastic material having a certain elastic recovery force. The cotton may be used cotton. Preferably, without using a conventional cotton, it is preferable to use a synthetic fiber cotton prepared so that the internal porosity of 30 ~ 70% by spinning the synthetic fiber amorphous. At this time, the synthetic fibers used may be cotton formed by spinning any one or more selected from the group consisting of polyester yarn filament, rayon yarn filament, polyester yarn filament, rayon yarn filament, microfiber filament. More preferably, it is good to use what is excellent in an elastic force. The reason is that in the case of the braided fiber has a constant elastic recovery force as the fiber itself, it can be processed by adjusting the elastic force as necessary. At this time, the elastic force is not particularly limited, and synthetic fiber wool, which is processed by appropriately selecting a synthetic fiber material having an appropriate elastic force, may be used.

On the other hand, the filler is preferably filled to have a proper filling density. If the proper filling density is not maintained, if the density is too high, it may be too bready to have a packaging difficulty in packaging the product, and there may be a problem that the buffering effect may be lowered. There is a disadvantage, and when pressed by the external pressure has a disadvantage that the circular recovery force is difficult to expect the buffering effect.

As described in the manufacturing method of the shock-absorbing packaging material of the present invention as described above, the high-density polyethylene nonwoven fabric (sample 1) and the non-woven fabric (sample 1), which is antistatically treated with an outer shell material, by using an embossing roller At the same time, a microneedle hole is further formed by using a nonwoven fabric having embossed nonwoven fabric, a high-density polyethylene nonwoven fabric (sample 2), and a fine needle hole forming member having fine needle needles on the nonwoven fabric (sample 2). High density polyethylene nonwoven fabric (sample 3), spunbonded polypropylene fiber sheet (sample 4) with controlled porosity, melt blown nonwoven fabric (sample 5), melt blown polypropylene fibrous web and spunbonded polypropylene fibersheet The composite (Sample 6) was prepared, and the Gurley air permeability and pore size were measured by the test method to take each sample. The results are shown in Table 1 below.

division	Gurley Air Permeability (sec)	Pore size (㎛)
Sample 1	16	0,1-10
Sample 2	37	0,1-10
Sample 3	41	0,1-10
Sample 4	1.5	1.0-10
Sample 5	42.6	1.0-10
Sample 6	30	1.0-10

<Gary Air Permeability>

Gurley air permeability was measured by the Gull Hill test method, which is a measure of the barrier strength of the sheet material to the gaseous material. In particular, it is a measure of the time it takes for any amount of gas to penetrate into a region of material in which a constant pressure component is present.

Gurley air permeability is measured in accordance with ASTM D-726-84 and TAPPI T-460 using Lorentzian End Wet Model 121 D Densometer. This test measures the time for which 100 cm 2 of air passes through a sample of 2.54 cm (1 inch) in diameter under a water pressure of about 12.45 cm (4.9 inches). The results are expressed in seconds and are commonly referred to as Gurley seconds. ASTM stands for 'American Society of Testing Materials' and TAPPI stands for 'Technical Association of the Pulp and Paper Industry'.

<Pore size>

Measured according to the bubble point method

On the other hand, for comparison between the cushioning packaging material to be provided in the present invention and a cotton cloth consisting of conventional neutral paper and cotton, sample 2 of the samples satisfying the Gurley air permeability conditions of the present invention of Table 1, and the conventional The physical properties and properties of cotton wool neutral paper were compared and tested. Comparative test results are shown in Table 2 and FIG. 5.

division	Liquid absorption capacity (%)	Air permeability (cc)	Potassium permanganate consumption (mg / L)	Bursting Strength (N)	pH test
Non-woven	117.1	1.0 ↓	1.3	172.0	6.7
Cotton cloth	313.7	34.0	9.5	27.5	7.5
Remarks	-	20cm2 200Pa	Detection limit: 1Requirement: 10 or less	Ballbusting	Distilled water: pH6.5 Temperature: 23 ° C

(Test Methods)

1.Liquid absorption capacity (%): FX3000-Ⅲ (Textest company)-Test method: ISO 9073-6

2. Air permeability (cc): FX3300 (Textest)-Test method: ISO 9237

3. Potassium Permanganate Consumption (mg / L): Standards for Packaging of Utensils and Containers

4. Burst strength (N): INSTRON1000 (Testresources)-Test Method: ASTM D 6797

5. pH test: Test method ISO 3071

As a result of the above Table 2, the hydrophilic weight of the nonwoven fabric used in the present invention shows a low value of 117.1%. This is because the polyethylene, which is a raw material of the nonwoven fabric, does not absorb moisture. However, the fine water weight is estimated to be due to the moisture remaining in the micropores formed on the nonwoven fabric or the embossing formed on the surface. On the other hand, neutral cloth for cotton was found to absorb moisture close to three times the weight.

The air permeability test and the amount of permeated air were measured to be less than 1.0cc of nonwoven fabric and 34.0cc of neutral cloth for cotton fabric. As can be seen from the scanning micrograph shown in Figure 5, since the nonwoven fabric is composed of high-density polyethylene micro-long fibers, the pore distribution has a 0.1 ~ 10㎛, material having a size larger than that, that is, the inner cotton Foreign substances, microorganisms, etc. can not pass, it can be seen that the gas is permeated. As an experiment to confirm this, as shown in Figure 7, the cotton and cushioning packaging material of the present invention was placed on the floor and knocked using a wooden rod, as a result, the cotton (a) was confirmed that the dust occurs cloudy, The buffer packaging material (b) of the present invention was confirmed that no dust at all. These results indicate that the nonwoven fabric used in the present invention has a very small pore size so that substances such as dust having a size greater than the thickness of the hair do not pass through, and the surface is corona treated and antistatic treated.

In the potassium permanganate consumption test, it was found that the nonwoven fabric was 1.3 mg / L, which showed very high oxidation resistance. In the case of the neutral paper for cotton, it was confirmed that the oxidation resistance was low at 9.5 mg / L.

As a result of rupture strength measurement, it can be seen that the nonwoven fabric has a strength that is 6 times higher than that of the neutral paper for cotton, and thus, it has a strong durability at the black or sharp part.

As a result of measuring the pH with the extract solution of pH6.5, it was found that the nonwoven fabric showed the value of pH6.7 and the neutral cloth for cotton felt the value of pH7.5. This is considered in connection with the potassium permanganate consumption test. Cotton neutral neutral paper has low chemical safety and is highly likely to be acidified by the external environment, while nonwoven fabric is expected to be very stable to chemical changes caused by the external environment.

Based on these test results, when using the nonwoven fabric constituting the present invention, it is possible to secure a very stable packaging material against physical and chemical changes before and after deterioration, and thus the cushioning packaging material thus manufactured is highly efficient as a safe packaging and management material. It can be applied.

The comparative test results described above are examples for explaining preferred embodiments of the present invention, and the present invention is not limited to the above comparative test results and may be modified as much as possible without departing from the scope of the present invention.

Claims (10)

1. In the buffer packaging material,

   Gurley air permeability measured in accordance with ASTM D726 is 1 to 100 seconds of the outer skin material, the outer material is cut into a rectangular shape to a certain size, and then one side end with respect to the longitudinal center axis Apply or apply a room temperature curing adhesive, a thermosetting adhesive or a double-sided adhesive tape to have a certain width, and then attach and fix one end portion in the longitudinal direction and an end portion horizontal to the central axis so that one side is opened, and the adhesive portion is opened. After the inverted so as to be located on the inside, the cushioning packaging material, characterized in that configured to fill the filler through the opening.
2. The method of claim 1,

   The envelope material is cushioning packaging material, characterized in that the emboss is further formed in the longitudinal direction on the outer surface.
3. The method of claim 1,

   The envelope material is a cushioning packaging material, characterized in that the softening and then forming a further fine pores using a needle.
4. The method of claim 1,

   The outer material is a flash spinning nonwoven fabric, a spunlace nonwoven fabric, a stitch nonwoven fabric, a hydroentangled nonwoven fabric, a dry-laid nonwoven fabric, a meltblown nonwoven fabric, a needle punched nonwoven fabric, a resin bonded resin cushioning packaging material, characterized in that any one selected from the group consisting of -bonded nonwoven fabric, spun-bonded nonwoven fabric, thermal bonded nonwoven fabric, wet-laid nonwoven fabric or a composite thereof .
5. The method of claim 1,

   The envelope material is a cushioning packaging material, characterized in that the electrostatically charged.
6. The method of claim 1,

   The outer shell material is a cushioning packaging material, characterized in that the non-woven web by spinning a high-density polyethylene fiber heat-bonded with a heating roller and then corona treatment (electro-flame discharge treatment), the antistatic treated high-density polyethylene nonwoven fabric.
7. The method of claim 1,

   The sheath material is a nonwoven fabric bonded from a compacted fibrous polyolefin sheet, a nonwoven fabric of spunbonded polypropylene fiber sheet, a PP meltblown nonwoven fabric, a PET spunbonded nonwoven fabric, a meltblown polypropylene fiberweb and a spunbonded polypropylene A cushioning packaging material, characterized in that the composite of the fibrous sheet.
8. The method of claim 1,

   The envelope material is a cushioning packaging material, characterized in that the pore size measured by the bubble point method is 0.1 ~ 10㎛.
9. The method of claim 1,

   The filler is a cushioning packaging material, characterized in that the cotton is manufactured so that the internal porosity is 30 to 70% by spinning the synthetic fibers in amorphous form.
10. The method of claim 1,

    The filler is a cotton wool formed by amorphous spinning at least one selected from the group consisting of polyester yarn filament, rayon filament, polyester filament filament, rayon filament filament, microfiber filament filament. Packing materials.

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