KR20100020713A - Structure of honeycomb and febricating method thereof - Google Patents

Structure of honeycomb and febricating method thereof Download PDF

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Publication number
KR20100020713A
KR20100020713A KR1020080079438A KR20080079438A KR20100020713A KR 20100020713 A KR20100020713 A KR 20100020713A KR 1020080079438 A KR1020080079438 A KR 1020080079438A KR 20080079438 A KR20080079438 A KR 20080079438A KR 20100020713 A KR20100020713 A KR 20100020713A
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KR
South Korea
Prior art keywords
honeycomb
reinforcement layer
honeycomb structure
reinforcing layer
layer
Prior art date
Application number
KR1020080079438A
Other languages
Korean (ko)
Inventor
박성호
임동철
Original Assignee
한일이화주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한일이화주식회사 filed Critical 한일이화주식회사
Priority to KR1020080079438A priority Critical patent/KR20100020713A/en
Publication of KR20100020713A publication Critical patent/KR20100020713A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/024—Honeycomb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/003—Interior finishings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • B32B38/004—Heat treatment by physically contacting the layers, e.g. by the use of heated platens or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric

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  • Laminated Bodies (AREA)

Abstract

The present invention relates to a honeycomb structure and a method for manufacturing the same, which are simple manufacturing processes, do not use adhesives in the manufacturing process, are recyclable, and are resource-saving and environmentally friendly.

Description

Honeycomb structure and its manufacturing method {Structure Of Honeycomb And Febricating Method Thereof}

The present invention relates to a honeycomb structure that is a material of a vehicle interior material, and more particularly, to a honeycomb structure and a method of manufacturing a resource-saving and eco-friendly structure that can be recycled without using an adhesive in the manufacturing process is simple.

Vehicle interior materials such as luggage mats, luggage boards, covering shelves, etc. are mainly based on resin felt, natural fiber reinforced boards, and wood stocks. Etc.

1 is a view schematically showing a conventional luggage mat.

Referring to FIG. 1, the luggage mat includes a substrate 110 having a preheated material formed by using a preheating oven or a heat press in a molding die, and a substrate (on both surfaces of the substrate 110). It is composed of a skin material 120 that is molded together at the time of molding 110, or adhered with an adhesive after molding the substrate 110.

The resin felt, which is a material of the substrate 110 of the luggage mat, is manufactured by impregnating phenolic resin (Phenolic Resin) on recycled fibers. Phenolic resin is a kind of thermosetting resin produced by condensation reaction of phenols and aldehydes. When incineration, unreacted or incomplete combustion generates phenol and aldehyde. Phenol and aldehyde cause environmental pollution that emit toxic gas. There is this.

Wood stock, which is a material of the substrate 110 of the luggage mat, is extruded from a wood powder and a polypropylene resin and molded into a sheet form. Such wood stock has the advantage of good formability and easy handling. However, deterioration of physical properties and smells may occur due to moisture absorption due to the use of wood flour, and the rigidity is weak, and thus there is a limit to the support of heavy materials. In addition, when the weight is heavy, there is a problem of reducing fuel consumption and increasing emissions when used as a vehicle interior. Recently, when manufacturing luggage mats or luggage boards with wood stocks, an Air Blowing Method has been developed to superimpose rigidity by overlapping two wood stocks and injecting air into a specific shape. However, there is a disadvantage in that the adverse effect of increasing the weight, rather than increasing the molding cycle time in the manufacturing process.

The natural fiber reinforced board, which is a material of the substrate 110 of the luggage mat, is formed by blending polypropylene fiber and natural fibers such as jute or jute in a proportion. Natural fiber reinforced board has the advantage of being lighter weight than phenolic resin or woodstock. However, there are disadvantages in deterioration of long-term physical properties and smells due to moisture, distortion and felt handling, and there is a disadvantage in that the skin 120 is adhered to the substrate 110 using an adhesive.

In addition, the resin felt, natural fiber reinforced board, and wood stock, in addition to the above problems, the weight is high, the unit price is high, the sound insulation and heat insulation is not excellent, easy to deform when used for a long time, harmful to human body and difficult to recycle have.

It is a figure which shows the example of the material of the base material of another conventional vehicle interior material.

Referring to FIG. 2, the substrate 110 of another conventional vehicle interior material includes a honeycomb 111 and various laminates 112 formed on both surfaces of the honeycomb 111. Since the shape of the honeycomb 111 is difficult to form, it is difficult to apply to complex shaped structures such as luggage mats or luggage boards, and it can be used only for simple shaped structures. If you use large materials, the fuel economy of the vehicle is bad. In order to solve the fuel consumption reduction problem, there is a problem in that the stability of the form is not secured when the laminate 112 is made of a nonwoven fabric.

In addition, the substrate of another conventional vehicle interior material is formed by inserting a honeycomb as a cushioning material between the canboard formed of polypropylene fiber and natural fiber, and the canboard formed of polypropylene fiber and natural fiber is manufactured through needle punching. As the material on the felt, these canboards must be compressed using a separate heat press. Then, the substrate is to insert the honeycomb in the upper layer of the can board pressed in a separate heat press, and then transferred to the molding process to manufacture the product. That is, another conventional substrate for interior materials of the vehicle has a complicated investment in manufacturing a product because the existing molding equipment cannot be used to manufacture can boards, and the skin material must be bonded using an adhesive. There are disadvantages.

Accordingly, an object of the present invention is to provide a honeycomb structure and a method for manufacturing the same, which are simple in manufacturing process, do not use an adhesive in the manufacturing process, and are recyclable, saving resources and environment-friendly.

In order to achieve the above object, the honeycomb structure according to an embodiment of the present invention is a honeycomb of polyolefin resin; Reinforcing layers comprising a first reinforcing layer formed of natural fibers and polypropylene fibers on both surfaces of the honeycomb and a second reinforcing layer formed of polyethylene powder on the surface of the first reinforcing layer.

The honeycomb is composed of cells having a honeycomb structure composed of 90% or more empty space.

The honeycomb has a thickness of 6 mm to 30 mm,

The reinforcing layer is 0.5 mm to 3.0 mm thick and has a weight of 200 g / m 2 to 800 g / m 2.

The reinforcing layer is formed of 30 to 45% by weight of polypropylene fiber, 45 to 55% by weight of natural fiber, and 5 to 10% by weight of polyethylene powder.

Method of manufacturing a honeycomb structure according to an embodiment of the present invention comprises the steps of forming a honeycomb, at the same time forming a reinforcement layer consisting of the first and second reinforcement layer; Contacting both surfaces of the honeycomb with the first reinforcement layer of the reinforcement layer; Bonding the reinforcing layer to both surfaces of the honeycomb by performing compression molding using a heating roller to the honeycomb in contact with the first reinforcing layer; Compression molding and cutting using a cooling roller.

The step of simultaneously forming the reinforcement layer composed of the first and second reinforcement layers while forming the honeycomb is performed through a hopper, an extrusion molding, a T-die, and a hydraulic process using a polyolefin resin such as polypropylene or polyethylene. Forming a honeycomb composed of cells having a honeycomb structure; Forming a nonwoven through natural felt or polypropylene fibers through opening, carding, and needle punching techniques; Forming the first non-woven fabric into a thin sheet by using a heating roller in compression molding; Applying polyethylene powder to one surface of the formed first reinforcing layer; Applying a heating roller to the polyethylene to form the second reinforcement layer to form a reinforcement layer in the form of a roll.

In the honeycomb structure according to an embodiment of the present invention and a method of manufacturing the same, the manufacturing process is simplified by bonding the reinforcing layer to the honeycomb using a heating roller in the compression molding process of the honeycomb. In addition, problems such as odor can be eliminated by not using an adhesive to adhere the reinforcing layer to the honeycomb. In addition, when discarding, the honeycomb and the reinforcing layer can be pulverized as it is without being separated, and can be recycled, thereby saving resources and being environmentally friendly.

In addition, the honeycomb structure and its manufacturing method according to an embodiment of the present invention is lightweight, unit price is relatively cheap, excellent rigidity, less hydrothermal side to ensure the dimensional stability, excellent impact energy and sound absorbing and insulating performance, the vehicle is closed The use of honeycomb that can be recycled even at the time of use makes it possible to compensate for the disadvantages of resin felt, natural fiber reinforced board, and woodstock, which are heavy in weight, high in price, soundproof and insulated, not easy to deform with long use, and are difficult to recycle. have.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 6.

3 is a view schematically showing a honeycomb structure according to an embodiment of the present invention.

Referring to FIG. 3, the honeycomb structure according to the embodiment of the present invention includes a honeycomb 10 and a first reinforcement layer 11a and a first reinforcement layer formed of natural fibers and polypropylene fibers on both surfaces of the honeycomb 10. It consists of a reinforcing layer 11 including a second reinforcing layer 11b formed of polyethylene powder on the surface of 11a).

The honeycomb 10 is made of a polyolefin resin such as polypropylene or polyethylene, and is composed of a cell 10a having a honeycomb structure by extrusion molding, and each cell 10a is 90% or more. This is made up of empty space. The thickness of the honeycomb 10 is made from 6 mm to 30 mm, preferably from 6 mm to 15 mm for moldability and thickness control of the crimp portion. This is because, if the thickness of the honeycomb 10 is less than 6 mm, product productivity may be reduced during extrusion molding, the rigidity of the structure may be weakened, and sound absorption is lowered. In addition, when the thickness of the honeycomb 10 exceeds 15 mm, the rigidity is improved and the sound absorption is also improved. This is because the molding pressure also increases.

In addition, the honeycomb 10 is light in weight and relatively inexpensive, has excellent rigidity, has a low number of hydrothermal sides, ensures dimensional stability, and has excellent impact energy and sound absorbing and insulating performance.

The first reinforcement layer 11a is made of natural fiber such as jute or hemp or polypropylene fiber, and the second reinforcement layer 11b is made of polyethylene powder. The first and second reinforcement layers 11a and 11b are manufactured in the same process. In detail the manufacturing method of the first and second reinforcing layers (11a, 11b), the opening, carding and needle punching process of the felt manufacturing technology from natural fibers or polypropylene fibers such as jute or hemp The first nonwoven fabric manufactured through the above-mentioned heating roller (Heat Roller) to form a thin sheet form the first reinforcing layer (11a), and then coated with polyethylene powder on one side of the first reinforcing layer (11a) using a heating roller again By forming the second reinforcement layer (11b), the reinforcement layer 11 is manufactured in the form of a roll. The reinforcement layer 11 is manufactured to a weight of 200 g / m 2 to 800 g / m 2 with a thickness of 0.5 mm to 3.0 mm, and preferably 0.5 mm to 1.0 for fuel efficiency improvement and warp prevention and shape stability of the honeycomb 10 according to weight reduction. It is prepared with a weight of 200 g / m 2 to 400 g / m 2 in mm thickness. In addition, the first reinforcing layer (11a) is 30 to 45% by weight of polypropylene fibers, 45 to 55% by weight of natural fibers, the second reinforcing layer (11b) is formed of 5 to 10% by weight of polyethylene powder.

When the reinforcement layer 11 is manufactured in a roll form, the reinforcement layer 11 is adhered to both surfaces of the honeycomb 10 using a heating roller in the compression molding process of the honeycomb 10. The honeycomb 10 is made of polyolefin, and the first reinforcement layer 11a is also made of polyolefin. Therefore, compatibility and bonding between the two materials are secured between the honeycomb 10 and the reinforcement layer 11, in particular, the first reinforcement layer 11a, so that the first reinforcement layer 11a is formed in the reinforcement layer 11 manufactured in the form of a roll. When contacting the honeycomb 10 and compression molding, the reinforcing layer 11 is bonded to the honeycomb 10 to form a honeycomb structure.

As described above, the honeycomb structure of the present invention simplifies the manufacturing process of the honeycomb structure by adhering the reinforcing layer 11 using a heating roller in the compression molding process of the honeycomb 10. In addition, the adhesive layer may not be used to adhere the reinforcing layer 11 to the honeycomb 10, thereby eliminating problems such as malodor. In addition, by using polyolefin resin as the material of the honeycomb 10 and using natural fibers, polypropylene fibers and polyethylene powder as the material of the reinforcing layer 11, the honeycomb 10 and the reinforcing layer 11 are not separated at the time of disposal. It can be pulverized as it is, and since polyolefin-based water, natural fibers, polypropylene fibers, and polyethylene powder are recyclable materials, they can be recycled, thereby saving resources and being environmentally friendly.

Hereinafter, a method of manufacturing a honeycomb structure according to an embodiment of the present invention will be briefly described with reference to FIG. 4.

Referring to Figure 4, the manufacturing method of the honeycomb structure according to the embodiment of the present invention felt opening technology (S10), carding (S12), and needle punching (S14) of natural or polypropylene fibers, such as jute or sheep. Nonwoven fabric is produced through the process. Then, the manufactured nonwoven fabric was formed in a thin sheet form using a heating roller in the compression molding step (S16), and polyethylene powder was applied to one surface of the formed first reinforcement layer (11a) ( After the S18), the second reinforcement layer 11b is formed again through the heating roller S20 to manufacture the reinforcement layer 11 formed of the first and second reinforcement layers 11a and 11b in a roll form (S22). .

The manufacturing method of the honeycomb structure of the present invention is the hopper (S11), extrusion molding (S13), T-die (S15) with a polyolefin resin such as polypropylene or polyethylene at the same time as the production of the reinforcing layer 11 And a honeycomb 10 composed of a cell 10a having a honeycomb structure through a hydraulic pressure step S17 (S19).

Subsequently, in the method for manufacturing a honeycomb structure of the present invention, the reinforcing layer 11, in particular, the first reinforcing layer 11a is adhered to both surfaces of the honeycomb 10 using a heating roller in a compression molding process (S24). The honeycomb structure is formed by using the compression molding (S26) and the cutting (S28).

5 is a view schematically showing a vehicle interior using a honeycomb structure of the present invention.

Referring to FIG. 5, the vehicle interior using the honeycomb structure of the present invention is formed on both surfaces of the honeycomb structure 20 and the honeycomb structure 20 shown in FIG. 3, in particular, on both surfaces of the second reinforcing layer 11b. It consists of a skin material 12.

The skin material 12 is formed and laminated to the preheated honeycomb structure 20 and then bonded by applying a predetermined pressure. The second reinforcement layer 11b of the honeycomb structure 20 uses high density polyethylene powder as the material, and the skin material 12 uses a polypropylene nonwoven fabric or a polyester nonwoven fabric as the material. Polyethylene powder and polypropylene nonwoven fabric or polyester nonwoven fabric have similar physical properties. Therefore, compatibility and bonding between the two materials are secured between the second reinforcing layer 11b and the skin 12, and when a certain pressure is applied, the skin 12 is adhered to both surfaces of the second reinforcing layer 11b. .

As described above, the vehicle interior material of the present invention is formed by laminating the skin material 12 to the honeycomb structure 20, in particular, to the second reinforcing layer 11b and applying a predetermined pressure thereto. Therefore, the vehicle interior material of the present invention can remove the odor caused by the use of the adhesive by not using the adhesive for the adhesion of the honeycomb structure 20 and the skin material 12, it is environmentally friendly by not using the adhesive.

The vehicle interior of the present invention has a weight of about 2,000 g / ㎡ in apparent density as 90% of the honeycomb is composed of a cell having an empty space. This is generally 9% and 17% lighter than 2,200 g / m 2 or 2,400 g / m 2 of wood stock used for the same purpose. Therefore, the vehicle interior material of the present invention is light in weight, thereby improving fuel efficiency and reducing the generation of combustion gas.

Referring to Figure 6, it will be briefly described a method for manufacturing a vehicle interior using a honeycomb structure of the present invention.

Referring to FIG. 6, when the honeycomb structure 20 is formed in the vehicle interior using the honeycomb structure (S30), the honeycomb structure 20 is preheated in a preheating oven (S32) and transferred to a molding mold process to form the honeycomb structure 20. The skin material 12 is laminated on both surfaces of the reinforcing layer 11, particularly the second reinforcing layer 11b (S34), and is molded into a vehicle interior material having a specific shape by applying a predetermined pressure (S36) (S38).

1 is a view schematically showing a conventional luggage mat,

2 is a view showing another conventional luggage mat,

3 is a view schematically showing a honeycomb structure according to an embodiment of the present invention;

4 is a flowchart illustrating a method of manufacturing a honeycomb structure according to an embodiment of the present invention;

5 is a view schematically showing a vehicle interior using a honeycomb structure of the present invention,

Figure 6 is a flow chart showing a method for manufacturing a vehicle interior using a honeycomb structure of the present invention.

<Explanation of symbols for the main parts of the drawings>

10, 111: honeycomb 11: reinforcing layer

12, 120: skin 20: honeycomb structure

110: base material 112: laminated material

Claims (7)

Honeycomb of polyolefin resin; And a reinforcement layer comprising a first reinforcement layer formed of natural fibers and polypropylene fibers on both surfaces of the honeycomb and a second reinforcement layer formed of polyethylene powder on the surface of the first reinforcement layer. The method according to claim 1, The honeycomb honeycomb structure, characterized in that consisting of a cell of a honeycomb structure consisting of more than 90% empty space. The method according to claim 1, Honeycomb structure, characterized in that the thickness of the honeycomb is 6mm to 30mm. The method according to claim 1, The reinforcing layer is a honeycomb structure, characterized in that the 0.5mm to 3.0mm thick, the weight of 200g / ㎡ to 800g / ㎡. The method according to claim 4, The reinforcing layer is a honeycomb structure, characterized in that formed from 30 to 45% by weight of polypropylene fiber, 45 to 55% by weight of natural fiber, and 5 to 10% by weight of polyethylene powder. Simultaneously forming a reinforcement layer composed of a first and a second reinforcement layer while forming a honeycomb; Contacting both surfaces of the honeycomb with the first reinforcement layer of the reinforcement layer; Bonding the reinforcing layer to both surfaces of the honeycomb by performing compression molding using a heating roller on the honeycomb in contact with the first reinforcing layer; Method for producing a honeycomb structure, characterized in that it comprises the step of compression molding and cutting using a cooling roller. The method according to claim 6, While forming the honeycomb, simultaneously forming a reinforcement layer composed of the first and second reinforcement layers, Forming a honeycomb composed of a cell having a honeycomb structure through a hopper, an extrusion molding, a T-die, and a hydraulic pressure process using a polyolefin resin such as polypropylene or polyethylene; Forming a nonwoven through natural felt or polypropylene fibers through opening, carding, and needle punching techniques; Forming the first non-woven fabric into a thin sheet by using a heating roller in compression molding; Applying polyethylene powder to one surface of the formed first reinforcing layer; And applying a heating roller to the polyethylene to form the second reinforcement layer to form a reinforcement layer in the form of a roll.
KR1020080079438A 2008-08-13 2008-08-13 Structure of honeycomb and febricating method thereof KR20100020713A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101284A1 (en) * 2010-07-13 2012-01-14 Fab Pelletterie Milano S P A ULTRALIGHT SUITCASE WITH HIGH RESISTANCE
KR20180023502A (en) * 2016-08-26 2018-03-07 원풍물산주식회사 A vehicle Covering shelfand a method of manufacturing the back
KR20180077711A (en) * 2016-12-29 2018-07-09 한화첨단소재 주식회사 Sandwich panel for luggage board of vehicle and method thereof
EP3388232A1 (en) * 2017-04-11 2018-10-17 Diehl Aviation Laupheim GmbH Method for producing a sandwich structure and sandwich structure produced according to the method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101284A1 (en) * 2010-07-13 2012-01-14 Fab Pelletterie Milano S P A ULTRALIGHT SUITCASE WITH HIGH RESISTANCE
KR20180023502A (en) * 2016-08-26 2018-03-07 원풍물산주식회사 A vehicle Covering shelfand a method of manufacturing the back
KR101866290B1 (en) * 2016-08-26 2018-06-11 원풍물산주식회사 A vehicle Covering shelfand a method of manufacturing the back
KR20180077711A (en) * 2016-12-29 2018-07-09 한화첨단소재 주식회사 Sandwich panel for luggage board of vehicle and method thereof
EP3388232A1 (en) * 2017-04-11 2018-10-17 Diehl Aviation Laupheim GmbH Method for producing a sandwich structure and sandwich structure produced according to the method

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