KR20170000449A - Sandwitch panel and the preparing method for the same - Google Patents

Sandwitch panel and the preparing method for the same Download PDF

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Publication number
KR20170000449A
KR20170000449A KR1020150089118A KR20150089118A KR20170000449A KR 20170000449 A KR20170000449 A KR 20170000449A KR 1020150089118 A KR1020150089118 A KR 1020150089118A KR 20150089118 A KR20150089118 A KR 20150089118A KR 20170000449 A KR20170000449 A KR 20170000449A
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KR
South Korea
Prior art keywords
core layer
layer
skin
panel
core
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KR1020150089118A
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Korean (ko)
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KR102019996B1 (en
Inventor
임지원
김동응
노상현
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(주)엘지하우시스
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Priority to KR1020150089118A priority Critical patent/KR102019996B1/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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/092—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising epoxy resins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

Abstract

A core layer; And a skin layer, wherein the outer side portion and the inner side portion are divided in a direction perpendicular to a layer surface of the core layer and the skin layer, the outer side portion is an area including a terminal end of the panel, Wherein the end of the panel is formed as a rounded end and the inner core layer is denser than the inner core core layer and a method of manufacturing the same.

Description

[0001] SANDWITCH PANEL AND THE PREPARING METHOD FOR THE SAME [0002]

To a sandwich panel and a method of manufacturing the same.

Sandwich panels, which have the same structural stiffness as a metal panel but are effective in reducing weight, are used in various fields such as construction materials. Generally, such a sandwich panel has a structure in which intermediate layers such as balsa wood, honeycomb, etc. are present between two metal layers, and it may be advantageous to secure a lightening effect by the intermediate layer than a metal panel of the same thickness. For example, Korean Patent Laid-Open Publication No. 10-2001-0087989 discloses a sandwich structure used as a sound absorbing plate including a honeycomb structure as a core between aluminum plates as a surface material. However, since such a sandwich panel has a multi-layer structure, it may be difficult to peel off the interlayer interface, reduce the formability, or impart a desired shape to the end portion of the panel in a process such as hemming or cutting.

One embodiment of the present invention provides a sandwich panel which is excellent in rigidity, is advantageous in weight reduction, can be realized in a thin thickness, and has excellent appearance at the end based on excellent processability.

Another embodiment of the present invention provides a method for manufacturing the above sandwich panel having both improved rigidity and lighter weight by improving the workability of the end portion through a simple process and processing the end portion with good workability.

The present invention relates to a sandwich panel, which is excellent in strength and rigidity, and exhibits excellent moldability and workability by bending or other processing, And a skin layer, wherein the outer side portion and the inner side portion are divided in a direction perpendicular to a layer surface of the core layer and the skin layer, the outer side portion is an area including a terminal end of the panel, And the end of the panel is formed as a rounded end so that it is excellent in rigidity and strength as well as light in weight and can be realized in a thin thickness, Provides sandwich panels that can be applied to products without finishing parts.

According to another embodiment of the present invention, there is provided a method of manufacturing the sandwich panel by a simple process, comprising: laminating a core layer and a skin layer on upper and lower portions of the core layer to produce a laminate; Partially peeling the skin layer from the end of the core layer; Bending the partially peeled core layer portion of the skin layer; And thermally-compressing the bended core layer portion.

Since the sandwich panel exhibits excellent appearance at its end portions, it can be applied to various products without a separate end finishing component, and it is possible to realize a thin thickness as a whole, thereby contributing to the tendency of various products to be slim and lightweight, Level stiffness and strength can be realized.

The manufacturing method of the sandwich panel can provide the sandwich panel in a simple process and can realize excellent workability in manufacturing the end round shape due to the advantages of the sandwich panel and as a result, The sandwich panel can be manufactured.

1 schematically shows a cross-section of a sandwich panel according to an embodiment of the present invention.
2 schematically shows a cross section of a sandwich panel according to another embodiment of the present invention.
3 schematically illustrates a sandwich panel manufacturing method according to an embodiment of the present invention.
4 schematically illustrates a method for manufacturing a sandwich panel according to another embodiment of the present invention.
FIG. 5 (a) is a photograph of a section of a sandwich panel fabricated by the sandwich panel manufacturing method according to an embodiment of the present invention, and FIG. 5 (b) (C) is a photograph of a section taken by the sandwich panel manufactured by the manufacturing method according to the prior art.
Fig. 6 schematically shows each of the sandwich panels of Figs. 5 (a), (b) and (c).

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the present invention pertains. Only. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

It will also be understood that when a layer, film, region, plate, or the like is referred to as being "on" or "over" another portion, . Conversely, when a part is "directly over" another part, it means that there is no other part in the middle. In addition, when a layer, film, region, plate, or the like is referred to as being "under" or "under" another portion, . Conversely, when a part is "directly underneath" another part, it means that there is no other part in the middle.

In one embodiment of the present invention, a core layer; And a skin layer, wherein the outer side portion and the inner side portion are divided in a direction perpendicular to a layer surface of the core layer and the skin layer, the outer side portion is an area including a terminal end of the panel, And the end of the panel is formed as a rounded end.

Since a general sandwich panel has problems such as delamination at the interlayer interface at the time of forming or processing due to the multilayer structure, it is difficult to arbitrarily adjust the shape of the end portion by bending or the like. The sandwich panel of the multi-layer structure has a sharp edge section, and if such a section is exposed to the outside, the human body and the surrounding environment may be damaged, and the appearance of the panel may be poor. Therefore, when such a sandwich panel is applied as one of the parts exposed to the outside when the sandwich panel is applied to the final product, it is necessary to wrap it by using a separate part so that the end face of the sandwich panel is not exposed to the outside.

However, in the sandwich panel according to the present invention, the end of the panel is formed as a round end portion. Specifically, since the skin layer and the core layer of the outer side have a round end portion, It is possible to realize the advantage that the overall weight is reduced and the thin thickness can be realized because no separate parts are required.

FIG. 1 schematically shows a cross-section of a sandwich panel 100 according to an embodiment of the present invention, and FIG. 2 schematically shows a cross-section of a sandwich panel 100 'according to another embodiment of the present invention .

1 and 2, the sandwich panel 100 or 100 'includes a core layer 10 and a skin layer 20. Specifically, the skin layer 20 includes a core layer 10 ). ≪ / RTI >

1 and 2, the sandwich panel 100 or 100 'includes an outer portion A and a medial portion B partitioned in a direction perpendicular to the layer surface of the core layer 10 and the skin layer 20, At this time, the outer side A is a region including the end of the panel, and the inner side B is a region including the center of the panel. The 'end of the panel' refers to a side edge region of the sandwich panel, and the 'center of the panel' refers to the center region of both ends of the sandwich panel.

Referring to FIGS. 1 and 2, the sandwich panel 100, 100 'has a rounded end at the end of the panel. The term "rounded end" means that the cross-sectional shape with respect to the distal end of the panel is a round shape having a predetermined radius of curvature. Since the sandwich panels 100 and 100 'are manufactured so as to include the ends formed at the round ends without any additional parts in the manufacturing process, the sandwich panels 100 and 100' can be made thin in thickness and excellent in appearance and can be advantageous in terms of economy, It is possible to obtain an advantage of securing strength and rigidity higher than the level.

When the sandwich panel of general multi-layer structure is to be processed by bending or the like, there arises a problem that the interlayer interface is peeled off. Alternatively, the sandwich panel of the present invention may include a specific core layer and a skin layer, and may be manufactured by a manufacturing method as described below to bend the interlayer interface so as not to peel off, rounded < / RTI > ends.

As a result, since the sandwich panel according to the present invention has the end of the round end, not only a rigidity and strength higher than a certain level with respect to the metal plate material can be secured, but also a finish shape excellent in surface texture and appearance can be secured.

Specifically, the core layer may include a resin having a viscous property. At this time, 'point stickiness' can be used as a concept covering either or both of stickiness and adhesiveness.

 Since the resin included in the core layer exhibits viscous adhesion, the core layer can be firmly adhered to the skin layer, and the adhesion of components or constituents constituting the core layer can also be improved. As a result, in the manufacturing method described later, excellent workability and moldability can be secured when bending and pressing to form round ends, and the durability of the sandwich panel can be greatly improved.

The visco-sensitive resin may specifically include one selected from the group consisting of an epoxy resin, an acrylic resin, a rubber resin, and a combination thereof.

Specifically, the epoxy resin may be at least one selected from the group consisting of a bisphenol-A epoxy resin, a bisphenol-F epoxy resin, a novolak epoxy resin, a linear aliphatic epoxy resin, a cycloaliphatic epoxy resin, ≪ / RTI > and combinations thereof;

The acrylic resin may include one selected from the group consisting of a polymethyl methacrylate resin, a hydroxy group-containing polyacrylate resin, a carboxyl group-containing polyacrylate resin, a polyurethane acrylate resin, and combinations thereof;

The rubber-based resin may include one selected from the group consisting of polyisoprene rubber, styrene-butadiene (SBR) rubber, polyisobutylene rubber, silicone rubber, butyl rubber, and combinations thereof.

The core layer of the sandwich panel may further comprise a fibrous filler. When the core layer further comprises a fibrous filler together with the viscous adhesive resin, the sandwich panel can secure an excellent rigidity with respect to the thickness, and excellent workability and moldability can be secured at the time of bending and compression have.

Specifically, the fibrous filler may include one selected from the group consisting of glass fibers, carbon fibers, polymer fibers, and combinations thereof.

For example, the fibrous filler may comprise polymer fibers, and more specifically may comprise polyamide fibers. When the fibrous filler comprises polyamide fibers, it is advantageous in terms of price competitiveness, and the elasticity of the sandwich panel is increased, which is advantageous in improving the formability during processing such as bending, improving the lightening effect and rigidity Can be more advantageous.

For example, the fibrous filler may be included in the core layer in the form of flocking. This can be produced by, when the core layer is produced by using the fibrous filler, filling the fibrous filler into the resin having the viscous property. In this case, it is possible to more effectively prevent the delamination of the interlayer interface at the time of bending according to a manufacturing method described later, thereby facilitating the formation of a rounded end at the end of the panel, Can be obtained.

The fiber used as the fibrous filler may have an average diameter in the cross section of about 20 탆 to about 70 탆. When the average diameter of the cross section is less than about 20 탆, the bending stress of the fiber is lowered, and the structural rigidity may be lowered. When the average diameter is more than about 70 탆, Can occur.

In addition, the average length of fibers used in the fibrous filler may be from about 1 mm to about 3 mm. When the average length of the fibers is less than about 1 mm, the support stiffness of the sandwich panel deteriorates. When the average length of the fibers is more than about 3 mm, the critical stress of the fibers is lowered and the buckling phenomenon There is a possibility that the structural rigidity of the sandwich panel is lowered.

Referring to FIGS. 1 and 2, the sandwich panel 100, 100 'may include a skin layer 20 positioned on the surface of the core layer 10.

The skin layer may include one selected from the group consisting of aluminum, iron, stainless steel (SUS), magnesium, electrogalvanized steel sheet (EGI), and combinations thereof. For example, the skin layer may be formed of stainless steel (SUS) or an electro galvanized steel sheet (EGI). In this case, it is possible to secure excellent structural rigidity in spite of the thin thickness, drawing, and hemming, it is possible to secure excellent moldability.

Referring to FIG. 1, the sandwich panel 100 may have a density of a core layer in the outer side portion A and a core layer in the inner side portion B. Specifically, in the sandwich panel 100, the density of the core layer in the outer portion A may be greater than the density of the core layer in the inner portion B. [

In the case of the sandwich panel 100 according to FIG. 1, the core layer in the outer side A has a density higher than that of the core layer in the inner side B so that the end region of the sandwich panel has a higher strength and / Rigidity of the sandwich panel can be ensured, and when the sandwich panel is applied to a final product without a separate end finishing component, the end region of the sandwich panel is exposed to the outside, which can exhibit excellent long-term durability.

When the density of the core layer in the outer portion A is larger than the density of the core layer in the inner portion B, the density difference may be about 0.05 to about 0.1 g / cm 3. It is easy to manufacture the sandwich panel so that the density difference satisfies the above range. In this case, the sandwich panel can secure an excellent appearance of the terminal area and secure the adequate supporting stiffness and structural rigidity as a whole.

In the case of the sandwich panel 100 'as shown in FIG. 2, the density of the core layer in the outer portion A and the density of the core layer in the inner portion B may be the same.

1 and 2, the thickness of the core layer in the outer side A and the core layer in the inner side B may be different from each other in the sandwich panel 100, 100 ' The thickness of the inner core inner layer may have a thickness ratio of 1: 1 to 2: 1. The thickness ratio means a ratio of the sum of the total thicknesses of the core layers in the outer portion and the total thickness of the core layers in the inner portion.

For example, in the case of the sandwich panel 100 as shown in FIG. 1, the thickness of the core layer in the outer portion A is 1: 1 or more, the thickness of the core layer in the inner portion B is 1: Lt; / RTI > thickness ratio.

For example, in the case of the sandwich panel 100 'as shown in FIG. 2, the thickness of the core layer in the outer portion A: the thickness of the core layer in the inner portion B is 2: 1 .

The inner side core layer and the inner side inner side core layer have a thickness ratio in the above range so that the sandwich panel can have a structure having an overall level of planarity so that when applied to a final product, It is possible to secure appropriate adhesiveness at the upper part and to notice the supporting ability which is easy to stack other parts on the upper part. In addition, since the end of the sandwich panel is formed as a round end, a good appearance can be obtained.

In the sandwich panel 100, 100 ', the thickness of the core layer 10 may be about 0.5 mm to about 2.0 mm. As described above, the total thickness of the core layer in the outer portion (A) and the total thickness of the core layer in the inner portion (B) may be different, but both may have a thickness in the above range, It is possible to secure the rigidity and strength with respect to the thickness and to improve the lightening effect.

The thickness of the skin layer 20 may be about 0.1 mm to about 1.0 mm. When the thickness of the skin layer 20 satisfies the above range, it is easy to peel the skin layer in the manufacturing method of the sandwich panel described later, and the structure rigidity of the sandwich panel can be secured. The thickness of the skin layer 20 means the thickness of each skin layer.

Specifically, the sandwich panels 100 and 100 'may be used as a lower cover of a display device. More specifically, the sandwich panel 100 may be used as an organic light emitting diode (OLED) display device or a lower cover of a liquid crystal display (LCD).

The sandwich panel 100 has a rounded end through which an excellent appearance can be realized without a separate part. As a result, the sandwich panel 100 can be realized with a thin thickness, The light emitting display device can be used as a display device or a lower cover of a liquid crystal display device, thereby maximizing the effect of slimming down and lightening the final product.

Another embodiment of the present invention is a method of manufacturing a laminate, comprising: preparing a laminate in which a skin layer, a core layer and a skin layer are sequentially laminated; Partially peeling at least one of the skin layers from the core layer; Bending the laminate so that a portion of the core layer partially peeled off the skin layer is folded; And pressing the bended laminate. The present invention also provides a method for manufacturing a sandwich panel.

Specifically, by using the sandwich panel manufacturing method, it is possible to manufacture the sandwich panel in which the end of the panel is formed as a rounded end, and more specifically, the interlayer interface is not peeled A sandwich panel can be manufactured which has excellent appearance and durability.

FIG. 3 schematically shows a procedure of a method for manufacturing a sandwich panel according to an embodiment of the present invention, and specifically shows a procedure of a manufacturing method for manufacturing the sandwich panel of FIG. 1 in detail.

FIG. 4 is a schematic view showing a procedure of a method for manufacturing a sandwich panel according to another embodiment of the present invention. FIG. 4 schematically shows a procedure of a manufacturing method for manufacturing the sandwich panel of FIG.

3 and 4, the method for fabricating a sandwich panel includes fabricating a laminate 200, 200 'in which a skin layer, a core layer, and a skin layer are sequentially laminated. Specifically, And manufacturing the laminate 200, 200 'by manufacturing the core layer 10 between the skin layers 20. The matters relating to the core layer and the skin layer are as described above.

More specifically, the core layer may include a resin having a viscous property and a fibrous filler. In this case, a core layer is prepared by disposing a resin having a viscous property and a fibrous filler between two skin layers of the same thickness , The laminate 200 and 200 'can be manufactured.

The method for fabricating a sandwich panel may include partially peeling at least one of the skin layers 20 from the core layer 10 in the laminate 200, 200 '.

Referring to FIG. 3, the step of partially peeling at least one of the skin layers from the core layer may partially peel off the skin layer in the direction toward the center of the layer surface of the skin layer, with the end of the layer surface of the skin layer as a starting point Step. The size or the range of the width at which the skin layer 20 is partially peeled off from the distal end of the core layer 10 can be appropriately set according to the use and necessity.

In this case, after the skin layer 20 is partially peeled from the end of the core layer 10 over a predetermined area, the skin layer 20 is partially peeled off and exposed to the outside, Bending the laminate so that a portion of the laminate 10 'is folded; And pressing the bended laminate.

Referring to FIG. 3, the interface between the core layers is brought into contact with each other by bending the laminate so that the core layer 10 'is folded, and the interface between the core layers is integrated by pressing the bended laminate .

When the bending laminated body is squeezed, a heat-compression method can be specifically used. It may be advantageous to use a heat-compression method to compress the interface between the core layers so that they are integrated with each other.

Specifically, when the bending laminate is heat-pressed, the heat-compression may be performed at a temperature higher than the glass transition temperature (Tg) of the component contained in the core layer. As a result, the interface between the core layers 10 'can be effectively integrated, and a sandwich panel having an appropriate thickness as a whole, excellent structural strength and rigidity, and excellent round end appearance can be obtained.

For example, the core layer may comprise a fibrous filler comprising a visco-adhesive resin comprising an epoxy resin and a polyamide fiber, wherein the glass transition temperature (Tg) of the component contained in the core layer is about From about 50 [deg.] C to about 75 [deg.] C, and the bended core layer portion can be heat-pressed at about 90 [deg.] C to about 140 [deg.] C.

That is, the heat-compression may be performed at a temperature higher than the glass transition temperature (Tg) of the components contained in the core layer by about 40 ° C to about 90 ° C, so as not to impair the physical structure or function of the core layer components, So that the sandwich panel having the high-density and high-rigidity end portions can be manufactured.

Referring to FIG. 4, the step of partially peeling at least one of the skin layers from the core layer may be performed by using a point spaced from the end of the layer surface of the skin layer by a predetermined distance as a starting point, And peeling in a direction toward the center. The size or the range of the width at which the skin layer 20 is partially peeled off from the core layer 10 can be appropriately set according to the use and necessity.

At this time, in the sandwich panel manufacturing method, after the skin layer 20 is partially peeled from the core layer 10, the portion of the core layer 10 'where the skin layer 20 is partially peeled off and exposed to the outside Bending the laminate to fold it; And pressing the bended laminate.

Referring to FIG. 4, the interface between the skin layers can be brought into contact with each other by bending and pressing the laminate so that the core layer 10 'exposed to the outside is partially folded.

The step of partially peeling the skin layer from the core layer may be performed using a computer precision control (CNC) process or a wire cutting process. When the partial peeling of the skin layer is carried out using such a process, the peeling process may be easy and it may be easy to control the width to be peeled to a width suitable for the step of bending and compressing subsequently .

For example, in the case of manufacturing a sandwich panel as shown in FIG. 3, a partial peeling can be performed in a direction toward the center of the layer surface of the skin layer with the end of the layer surface of the skin layer as a starting point. In this case It is advantageous in terms of process efficiency and economy to use a wire cutting process.

For example, in the case of manufacturing a sandwich panel as shown in FIG. 4, a point spaced a predetermined distance from the end of the layer surface of the skin layer is set as a starting point, and a direction toward the center of the layer surface of the skin layer Partial peeling can be performed, and in this case, it is advantageous in terms of process efficiency and economy to use a computer precision control (CNC) process.

In the case of manufacturing the sandwich panel as shown in FIGS. 3 and 4, the method of bending and pressing the sandwich panel is a type of bending, and may be referred to as a so-called hemming process. Generally, when a part in the form of a plate is applied to a final product, there may be a burr due to processing defects on the surface of the end part. These protrusions may cause damage to the human body, or may cause problems of poor appearance design. Therefore, such a burr is prevented from being visible from the outside through the bending process, which is called a so-called hemming process.

Conventional sandwich panels are subjected to such a hemming process in order to process them because the different layers such as the skin layer and the core layer are mutually stretched due to the multi-layer structure, and the overall tensile strength is low There is a problem that the folded portion is broken or the interface between the skin layer and the core layer is peeled off.

However, as described above, the sandwich panels 100 and 100 'according to the present invention are manufactured through the manufacturing method as shown in FIGS. 3 and 4, so that the interface between the core layer and the skin layer is not peeled off, The end can be well bended and squeezed to form a good rounded end, and furthermore, by including a core layer and a skin layer of a specific material, it is possible to obtain a more advantageous advantage in applying such a manufacturing method.

Specifically, in the above sandwich panel manufacturing method, in the case of a hemming process for bending and pressing the laminate, the core layer 10 of the sandwich panel includes a resin having a viscous property and a fibrous filler, Layer interface between the layer and the skin layer is not peeled off, and thus it is advantageous to bend and squeeze. As a result, a sandwich panel having excellent appearance and durability can be produced.

More specifically, the core layer 10 of the sandwich panel may comprise a resin having a viscous property and a fibrous filler, and the fibrous filler may be included in the core layer in the form of flocking, A more advantageous advantage can be obtained in performing the hemming process.

5 (a) is a photograph of a section of a sandwich panel subjected to hemming treatment by the sandwich panel manufacturing method according to an embodiment of the present invention, and FIG. 5 (b) 7 is a photograph showing a section of a sandwich panel subjected to hemming treatment according to an embodiment of the present invention. 5 (c) is a photograph of a section of a sandwich panel obtained by hemming the skin layer without partially peeling off the skin layer. Fig. 6 is a diagram showing (a), (b) and (c) of Fig. 5 respectively.

5 and 6, as described above, the sandwich panel manufacturing method of the present invention is characterized in that a part of the skin layer 20 in the laminate 200, 200 ' And a hemming process in which the portion of the core layer 10 'exposed to the outside by the partially peeled skin layer 20 is bent and pressed so as to be folded. As a result, as shown in FIGS. 5 and 6 (c), end portions having a finer shape can be formed than in the case of hemming without peeling the skin layer 20, and due to the pressed core layer, It is possible to obtain an excellent support performance with a flatness of more than a level.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

< Example  And Comparative Example >

Example  One

Two stainless steel (SUS) skin layers each having a thickness of 0.3 mm were provided, and a core layer including an epoxy resin and a polyamide fiber filler having a viscous property was formed between the two skin layers to a thickness of 1.1 mm, . At this time, the polyamide fiber filler contained a core layer in the form of floking. Subsequently, one of the skin layers was partly peeled off from the core layer using a wire cutting process, specifically, the both ends of the layer surface of the skin layer were used as starting points, and the direction toward the center of the layer surface Respectively. The skin layer was partially folded in half so as to bend at a point 5 mm long from both ends, and the interface of the contacting core layer was heat-pressed at a pressure of 0.3 MPa at a temperature of 100 캜 to integrate the sandwich panel .

Example  2

One of the skin layers was partly peeled off from the core layer using a computerized precision CNC process, specifically, 15 layers were formed from both ends of the layer surface of the skin layer, And a partial separation was performed with a width of 5 mm each in the direction toward the center of the layer surface with the starting point as the point spaced apart by ㎜. The skin layer was bent so that the partially peeled core layer portion was bent, and the interface of the skin layer thus contacted was pressed at room temperature under a pressure of 0.3 MPa to prepare a sandwich panel.

Comparative Example  One

Two stainless steel (SUS) skin layers each having a thickness of 0.3 mm were provided, and a core layer including an epoxy resin and a polyamide fiber filler was formed between the two skin layers to a thickness of 1.1 mm to form a laminate. Subsequently, without subjecting the skin layer to partial peeling, the laminate was bent so as to bend 5 mm long from both ends of the laminate, and the laminate was heat-pressed at a pressure of 0.3 MPa at 100 DEG C to produce a sandwich panel .

Comparative Example  2

A panel made of a metal sheet material of stainless steel of 1.7 mm thickness was prepared.

<Evaluation>

(1) Appearance evaluation of sandwich panels

Sections of the sandwich panels of Examples 1 and 2 were photographed, and the photographs thereof are shown in Figs. 5 (a) and 5 (b), respectively. 5 (c) shows a photographic image of a cross section of the sandwich panel of Comparative Example 1. As shown in Fig. 5 (a) and 5 (b), the sandwich panels of Examples 1 and 2 were obtained by partially peeling the skin layer, bending the core layer, and pressing at appropriate temperature and pressure, it can be seen that the shape of the rounded end is implemented. On the other hand, the sandwich panel of Comparative Example 1 was intended to bend and squeeze the skin layer without partially peeling the skin layer, and the skin layer which was in contact with the skin layer was not closely adhered to the skin layer.

That is, while the sandwich panel of Examples 1 and 2 is suitable for use as a component whose end is exposed to the exterior, the sandwich panel of Comparative Example 1 provides a suitable appearance for such components through bending and thermocompression It is difficult, and it can be seen that a separate component is needed to secure the appearance of the required end portion.

(2) Measurement of density and thickness

The density and thickness of the inner core layer and the inner core core layer, respectively, of the sandwich panels of Examples 1 and 2 and Comparative Example 1 were measured and described in Table 1 below.

(3) Springback ( spring back ) Measurement of the test angle

For the sandwich panels of Examples 1 and 2 and Comparative Example 1, the springback test angles were measured at room temperature after fabrication. The springback test angle refers to a case where the interface is formed at a predetermined angle due to the spring back phenomenon caused by the elasticity of the bent portion after bending and pressing to form the round end portion in the manufacturing process of the sandwich panel , Indicating the angle. For example, in the case of Comparative Example 1, the angle? Shown in FIG. 6C is measured. The measurement results of Examples 1 and 2 and Comparative Example 1 are shown in Table 1 below.

Core layer density [g / cm3] Core layer thickness [mm] Spring back test angle Lateral side Medial side Lateral side Medial side Example 1 0.68 0.63 1.9 1.1 0 ° Example 2 0.63 0.63 2.2 1.1 2 ° Comparative Example 1 0.63 0.63 2.2 1.1 6 °

Referring to the results of Table 1, the first embodiment is such that the interfaces of the core layers come into contact with each other at the interfaces of the core layers in the bending and pressing processes, and the inner core layer is denser than the inner core core layer, Thickness of the core layer: It can be seen that the thickness of the inner core core layer has a thickness ratio of less than 2: 1.

The inner layer core layer and the inner core inner core layer are not substantially different in density from each other, and the thickness of the core layer in the outer side portion is equal to the thickness of the core layer in the inner side portion, It can be seen that the thickness of the layer has a thickness ratio of 2: 1.

In Comparative Example 1, both ends of the skin layer were subjected to bending and thermocompression without a process of peeling the skin layer. The density and thickness of the core layer were the same as or similar to those of Example 2, The skin layers could not be closely adhered to each other as compared with Example 2, so that a planarity over a certain level as a whole could not be achieved and excellent round ends could not be formed.

In Example 1, the interfaces of the core layers were tangent to each other in the bending and pressing process, and the springback test angle was 0 °. That is, due to the integration of the core layer, the bending and the compressed shape are maintained as they are, and thus the sandwich panel has a flatness of a certain level or more. However, in the case of the second embodiment, since the skin layers are not integrated with each other at the interfaces of the skin layers in the same process, the spring back test angle is larger than that of the first embodiment there was. However, in Example 2, the springback test angle was smaller than that in Comparative Example 1 in which the bending process was performed without partial peeling of the skin layer. As a result, in the case of Examples 1 and 2 It was found that excellent appearance and planarity were realized as compared with Comparative Example 1.

(3) Measurement of structural stiffness

For the sandwich panels of Examples 1 and 2, the structure rigidity was measured using a universal testing machine (INSTRON 5569A) in accordance with the stiffness measuring method (ASTM C393) in the state of a laminate having a thickness of 1.7 mm before the round ends were formed And the structural rigidity of the metal plate of stainless steel of 1.7 mm in the comparative example 2 was measured in the same manner. The average density was calculated by dividing the total mass (g) by the total volume (cm 3) for the laminate of Examples 1 and 2, and the average density was also calculated for the metal plate of Comparative Example 2 by the same method. The results are shown in Table 2 below.

Thickness of laminate [mm] Structural stiffness [Nmm] Average density [g / cm3] Examples 1 and 2 1.7 49130 4.3 Comparative Example 2 1.7 70423 7.8

Referring to the results of Table 2 above, the laminate for manufacturing the sandwich panels of Examples 1 and 2 had a structural rigidity of about 65% or more of the structural rigidity of the metal plate of Comparative Example 2 having the same thickness, Of about 69% to about 70%. Thus, it can be seen that the sandwich panels of Examples 1 and 2 have a rigidity higher than a certain level of the metal plate material. That is, in the case of Examples 1 and 2, the laminate was processed to fabricate a sandwich panel that realized an excellent appearance shape without a separate member. Specifically, the sandwich panel was used for a lower cover of a display device, And it was found that adequate rigidity was secured together.

In addition, the laminate of Examples 1 and 2 exhibited remarkably low average density compared with the metal plate of Comparative Example 2 having the same volume, thereby realizing a superior light weight effect. Specifically, the average density of the laminates of Examples 1 and 2 was less than about 60% of the average density of the metal plate of Comparative Example 2, and specifically about 55% to about 56%. Thus, in the case of Examples 1 and 2, the laminate was processed to fabricate a sandwich panel having excellent appearance without any additional member, and specifically, it was used for a lower cover of a display device, Weight reduction and slimming effect were secured.

100, 100 ': sandwich panel
200, 200 ': laminate
10, 10 ': core layer
20: Skin layer
A:
B: medial side

Claims (19)

A core layer; And a skin layer,
Wherein the inner side portion is a region including the center of the panel, and the inner side portion is a region including the center of the panel, and the outer side portion is a region including the end portion of the panel,
The end of the panel is formed with a rounded end
Sandwich panels.
The method according to claim 1,
Wherein the core layer comprises a resin having a viscous property
Sandwich panels.
The method according to claim 1,
The visco-sensitive resin includes one selected from the group consisting of an epoxy resin, an acrylic resin, a rubber resin, and combinations thereof
Sandwich panels.
The method according to claim 1,
Wherein the core layer comprises a fibrous filler
Sandwich panels.
5. The method of claim 4,
Wherein the fibrous filler comprises one selected from the group consisting of glass fibers, carbon fibers, polymer fibers, and combinations thereof
Sandwich panels.
5. The method of claim 4,
The fibrous filler is contained in the core layer in the form of flocking
Sandwich panels.
The method according to claim 1,
Wherein the skin layer comprises one selected from the group consisting of aluminum, iron, stainless steel (SUS), magnesium, electrogalvanized steel sheet (EGI)
Sandwich panels.
The method according to claim 1,
The thickness of the core layer is 0.5 mm to 2.0 mm
Sandwich panels.
The method according to claim 1,
The thickness of the skin layer is preferably from 0.1 mm to 1.0 mm
Sandwich panels.
The method according to claim 1,
The density of the core layer in the outer side is larger than the density of the core layer in the inner side
Sandwich panels.
11. The method of claim 10,
The density difference between the inner core layer and the inner core core layer is 0.05 to 0.1 g / cm &lt; 3 &gt;
Sandwich panels.
The method according to claim 1,
The thickness of the core layer in the outer side: the thickness of the core in the inner side has a thickness ratio of 1: 1 to 2: 1
Sandwich panels.
13. The method according to any one of claims 1 to 12,
The sandwich panel is used as a lower cover of a display device
Sandwich panels.
Preparing a laminate in which a skin layer, a core layer, and a skin layer are sequentially laminated;
Partially peeling at least one of the skin layers from the core layer;
Bending the laminate so that a portion of the core layer partially peeled off the skin layer is folded; And
And pressing the bended laminate
Method of manufacturing a sandwich panel.
15. The method of claim 14,
The step of partially peeling at least one of the skin layers from the core layer includes a step of partially peeling off the core layer in a direction toward the center of the layer surface of the skin layer with the end of the layer surface of the skin layer as a starting point
Method of manufacturing a sandwich panel.
16. The method of claim 15,
The interface between the core layers is brought into contact with each other by bending the laminate so that the skin layer partially peeled off the core layer and the interface between the core layers is integrated by pressing the bended laminate
Method of manufacturing a sandwich panel.
15. The method of claim 14,
The step of partially peeling at least one of the skin layers from the core layer may include a step of forming a part of the skin layer in the direction toward the center of the layer surface of the skin layer, The peeling step
Method of manufacturing a sandwich panel.
18. The method of claim 17,
The interface between the skin layers is brought into contact with each other by bending the laminate so that the portion of the core layer partially peeled off the skin layer is folded
Method of manufacturing a sandwich panel.
15. The method of claim 14,
The step of partially peeling the skin layer from the core layer is performed using a computer precision control (CNC) process or a wire cutting process
Method of manufacturing a sandwich panel.
KR1020150089118A 2015-06-23 2015-06-23 Sandwitch panel and the preparing method for the same KR102019996B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0429839A (en) * 1990-05-26 1992-01-31 Matsushita Electric Works Ltd Manufacture of panel having curved end part
JPH06198790A (en) * 1992-12-28 1994-07-19 Ig Tech Res Inc Composite board
KR20000022330A (en) * 1996-07-04 2000-04-25 벌퀴스트 거나 Formable sandwich construction material and use of the material as construction material in vehicles, refrigerators, boats, etc.
JP2014511291A (en) * 2011-02-21 2014-05-15 プロダクティブ リサーチ エルエルシー． Composite materials and methods comprising regions of different properties
JP2015077735A (en) * 2013-10-17 2015-04-23 岐阜プラスチック工業株式会社 Edge face working method for hollow structure panel, edge face treatment device, and hollow structure panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0429839A (en) * 1990-05-26 1992-01-31 Matsushita Electric Works Ltd Manufacture of panel having curved end part
JPH06198790A (en) * 1992-12-28 1994-07-19 Ig Tech Res Inc Composite board
KR20000022330A (en) * 1996-07-04 2000-04-25 벌퀴스트 거나 Formable sandwich construction material and use of the material as construction material in vehicles, refrigerators, boats, etc.
JP2014511291A (en) * 2011-02-21 2014-05-15 プロダクティブ リサーチ エルエルシー． Composite materials and methods comprising regions of different properties
JP2015077735A (en) * 2013-10-17 2015-04-23 岐阜プラスチック工業株式会社 Edge face working method for hollow structure panel, edge face treatment device, and hollow structure panel

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