KR101999532B1 - Shaped articles of sandwich panels and forming method for sandwich panels - Google Patents

Abstract

There is provided a molded article comprising a core layer and a sandwich panel including a skin layer laminated on both sides of the core layer, and integrally molding the round section formed with a predetermined three-dimensional radius of curvature.

Description

TECHNICAL FIELD [0001] The present invention relates to a molded article of a sandwich panel and a method of forming the sandwich panel,

To moldings of sandwich panels and methods of forming sandwich panels.

Conventional sandwich panels use a material such as balsa wood or foamed plastic in order to lighten the weight or use a honeycomb structure made of metal or the like in order to improve sound insulation and flame retardancy, . However, a general sandwich panel including such a core material has a problem in that the interlayer coupling force is weak, or the strength is weak and the formability is poor when it is processed into various shapes.

For example, Korean Patent No. 10-0786335 discloses a sandwich panel for interior and exterior materials including fired wood panels. The fired wood panel includes a unit panel, a dissimilar panel formed of a cork material and a resin material, and is for the purpose of weight reduction and improvement of sound quality. Korean Patent Laid-Open No. 10-2009-0064837 discloses a sandwich panel for a vehicle having a honeycomb core and a support sheet bonded to both sides of the honeycomb core with an adhesive layer interposed therebetween. The sandwich panel having the honeycomb core is intended to secure the stiffness and the low cost of production with respect to weight and obtain the effect of in-mold molding.

As described above, the sandwich panel having the firing wood or honeycomb core has various limitations in terms of prevention of interlayer peeling and prevention of wrinkling in order to realize various shapes through molding with a large degree of deformation.

Therefore, there is a need for research on a sandwich panel which can overcome the structural limitations of excellent moldability while securing a high level of support performance and mechanical properties.

In one embodiment of the present invention, there is provided a molded article of a sandwich panel which can be applied in various applications by realizing excellent moldability and excellent surface appearance.

In another embodiment of the present invention, a method of forming a sandwich panel is provided.

However, the technical problem to be solved by the present invention is not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

In one embodiment of the present invention, a sandwich panel molding is integrally formed by molding a sandwich panel including a core layer and a skin layer laminated on both sides of the core layer to form a round portion formed with a predetermined three-dimensional radius of curvature do.

And the horizontal axis inner curvature radius Rh of the round portion may be about 3 mm to about 10 mm.

The radius of curvature Rv of the round portion in the vertical axis may be about 0.5 mm to about 5 mm.

The molded article of the sandwich panel may be integrally formed into a cover shape including a bottom surface and a side surface, and the boundary between the bottom surface and the side surface may be the round section.

The cover shape may be a hollow cylindrical shape or a hollow square shape.

The core layer may comprise a fibrous filler.

The core layer may comprise from about 50% to about 70% by weight of the fibrous filler.

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

The core layer may comprise a thermosetting resin, a thermoplastic resin or both.

The thickness of the core layer may be about 0.5 mm to about 2 mm.

The skin layer may include one selected from the group consisting of iron, stainless steel (SUS), aluminum magnesium, copper, and combinations thereof.

The thickness of the skin layer may be about 0.1 mm to about 1 mm.

A back cover of an image display apparatus or an interior and exterior material of an automobile.

The sandwich panel can be integrally formed by press working.

In another embodiment of the present invention, there is provided a method of making a sandwich panel comprising the steps of: preparing a sandwich panel comprising a skin layer on both sides of a core layer; And forming the sandwich panel integrally with a molded product including a round portion formed with a predetermined three-dimensional radius of curvature.

The inner radius of curvature Rh of the round portion may be formed to be about 3 mm to about 10 mm.

And the radius of curvature Rv of the round portion in the vertical axis may be about 0.5 mm to about 5 mm.

In preparing the sandwich panel, the core layer may be formed of a material containing a fibrous filler.

The molded article of the sandwich panel has excellent moldability and excellent surface appearance and can be applied to various applications.

1 is a schematic cross-sectional view of a sandwich panel used to mold a molded article according to one embodiment of the present invention.
2 is a schematic view schematically showing an example of the shape of a molded product according to an embodiment of the present invention.
3 is a schematic process flow diagram of a method of forming a sandwich panel in accordance with another embodiment of the present invention.
FIG. 4 is a schematic view showing a process of forming a molded article by performing a drawing process using a press apparatus.
5 is an image photograph of the molding according to Example 1. Fig.
6 is an image photograph of the molding according to the second embodiment.
7 is an image photograph of a molded article according to Comparative Example 1. Fig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals 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.

Hereinafter, formation of an arbitrary structure in the upper part (or lower part) or the upper part (or lower part) of the substrate means not only that an arbitrary constitution is formed in contact with the upper surface (or lower surface) of the substrate, And any configuration formed on (or under) the substrate.

In one embodiment of the present invention, a sandwich panel molding is integrally formed by molding a sandwich panel including a core layer and a skin layer laminated on both sides of the core layer to form a round portion formed with a predetermined three-dimensional radius of curvature do. FIG. 1 is a schematic cross-sectional view of a sandwich panel 100 for use in molding a molded article according to an embodiment of the present invention.

Generally, a sandwich panel is manufactured by interposing a foam or a core material including a plastic resin between metal plates in order to simultaneously satisfy the effects of weight reduction and cost reduction while maintaining excellent structural rigidity and strength. However, When the panel is integrally formed by press working or the like, the plastic strain of the metal plate and the core material in the bent or folded portions greatly differs from each other, so that the panel is detached and worn, and wrinkles or fatigue phenomena occur. Thus, the sandwich panel satisfying both structural rigidity, strength, light weight, and low cost requirements can be used only as a flat plate shape that is not bent or folded, and is not applicable to various fields requiring a predetermined shape.

Further, in order to solve such a problem, each of the metal plate and the core material is manufactured separately in a predetermined shape and then attached thereto. However, since the manufacturing process is complicated, time and cost are largely consumed and productivity is remarkably low.

In one embodiment of the present invention, when the sandwich panel 100 including the core layer 120 and the skin layer 110 stacked on both sides of the core layer 120 is molded, a predetermined three-dimensional radius of curvature The moldability is improved and the sandwich panel 100 itself can be integrally formed without separately forming and attaching the core layer 120 and the skin layer 110. Thus, There is an advantage that the surface appearance can be realized and the structural rigidity, strength and lightness can be maintained.

Accordingly, the molded product of the sandwich panel 100 is simplified in the manufacturing process, thereby further reducing the time and cost, thereby effectively improving the fairness, economy, and productivity.

For example, the sandwich panel 100 can be integrally formed by press working. The press working means a plastic working, and can specifically mean machining by a press machine. FIG. 4 is a schematic view showing a process of forming a molded article by performing a drawing process using a press apparatus.

The press working may be, for example, drawing work, and the drawing processing may be performed by using a press machine having a die 401, a punch 402, To form a cover-like shape or a container shape having no joint by applying pressure thereto. For example, the plate-like material can be molded into the interior shape of the die 401 while pushing the inside of the die 401, i.e., the blank 403, with the punch 402.

In one embodiment, the sandwich panel 100 is integrally molded in a cover shape or container shape including a bottom surface and a side surface, and the boundary between the bottom surface and the side surface is a rounded part .

For example, the cover shape or the container shape may include a hollow cylindrical shape, a hollow square shape, or both of them. The hollow square shape is a prismatic shape having an empty interior, for example, a hollow cubic shape, a hollow rectangular shape . 2 is a schematic view schematically showing an example of the shape of a molded product according to an embodiment of the present invention.

In addition, the bottom surface and the side surface may each have at least one shape selected from the group consisting of a planar shape, a concave shape, a convex shape, and a combination thereof, and are not particularly limited. And may be formed to include various shapes.

In this specification, the radius of curvature is divided into a horizontal axis and a vertical axis with a virtual plane passing through a boundary between the bottom surface and the side surface as a reference plane. When the bottom surface is plane, It can be the same as a virtual plane. In addition, the curvature radius was measured based on the inner radius of curvature.

And the horizontal axis inner curvature radius Rh of the round portion may be about 3 mm to about 10 mm. The inner radius of curvature of the horizontal axis is defined as an inner radius of curvature with respect to an axis horizontal to the reference plane and an xy axis and is defined within the above range so that the core layer 120 and the skin layer 110 are formed at the time of molding the sandwich panel 100, So that they may not be desorbed or peeled off from each other.

Also, the radius of curvature Rv in the vertical axis of the round portion may be, for example, from about 0.5 mm to about 5 mm, and more specifically from about 2 mm to about 5 mm. The radius of curvature of the vertical axis is defined as an inner radius of curvature with respect to an axis perpendicular to the reference plane and a z axis. The radius of curvature of the vertical axis is defined as the radius of curvature of the core layer 120 and the skin layer 110 at the time of molding the sandwich panel 100, So that they may not be desorbed or peeled off from each other.

The radius of curvature Rd of the inside of the large-angle axis of the round portion can be determined depending on the radius of curvature of the inside of the horizontal axis Rh and the radius of curvature Rv of the vertical axis, and is not particularly limited. The radius of curvature inside the diagonal axis may be an internal radius of curvature with respect to a predetermined axis which is inclined with respect to the reference plane, for example, an angle of more than 0 DEG and less than 90 DEG.

As described above, by limiting the horizontal axis inner curvature radius Rh and the vertical axis inner radius of curvature Rv to the above-mentioned range, the moldability of the sandwich panel 100 is effectively improved, and the core layer 120 and the skin The layers 110 can be integrally formed without wrinkles or fraying phenomenon, whereby excellent moldability and excellent surface appearance can be realized at the same time.

The core layer 120 may include a thermosetting resin, a thermoplastic resin, or both, and may specifically include one selected from the group consisting of an epoxy resin, an acrylic resin, a rubber resin, and a combination thereof.

For example, the epoxy resin may be at least one selected from the group consisting of bisphenol-A epoxy resin, bisphenol-F epoxy resin, novolac epoxy resin, linear aliphatic epoxy resins, cycloaliphatic epoxy resins, And combinations thereof.

Further, for example, 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 have.

Further, for example, 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 120 may include a visco-adhesive resin, and the visco-adhesive resin may be used as a concept covering a resin capable of exhibiting adhesiveness or adhesiveness depending on the degree of curing. The kind of the viscous adhesive resin may be the same as that described above with respect to the resin contained in the core layer 120. As described above, not only the adhesiveness to the skin layer 110 including the viscous adhesive resin but also the adhesion to other components in the core layer 120 is improved, so that more excellent formability and durability can be realized .

In addition, the core layer 120 may comprise a fibrous filler, and the fibrous filler may include one fiber selected from the group consisting of, for example, glass fibers, carbon fibers, polymer fibers, metal fibers, and combinations thereof can do.

Specifically, the fibrous filler includes carbon fibers, metal fibers, or both of them, and the molded product realizes excellent electrical conductivity, and the molded product is attached to a predetermined metallic material part by welding, or a plurality of the molded products They can be attached to each other by welding. On the other hand, the fibrous filler may include, for example, a polymer fiber, specifically, a polyamide-based polymer fiber, thereby improving price competitiveness and improving the weight saving effect, elasticity and structural rigidity of the sandwich panel 100 It can be more advantageous to make.

The core layer 120 may comprise from about 50% to about 70% by weight of the fibrous filler. When the sandwich panel 100 is integrally formed by bending, folding, or the like while sufficiently supporting the skin layer 110 stacked on both sides of the core layer 120 by including it in the content within the above range, Separation and desorption of the core layer 120 and the skin layer 110 can be further prevented.

The average diameter of the cross-sections of the fibers included in the fibrous filler may be from about 20 占 퐉 to about 70 占 퐉.

Further, the average length of the fibers contained in the fibrous filler may be about 1 mm to about 3 mm.

In addition, for example, the fibrous filler may be flocked into the core layer 120 so that the sandwich panel 100 maintains a high level of rigidity and strength, Or the fatigue phenomenon can be effectively prevented.

The fibrous filler may be flocked according to methods known in the art and may be, for example, flocked by electrostatic flock process, but is not limited thereto.

The skin layer 110 may include at least one selected from the group consisting of iron, stainless steel (SUS), aluminum magnesium, copper, and combinations thereof. Specifically, the iron may be included in the form of a steel sheet, For example, it may include one selected from the group consisting of an electro galvanized steel sheet (EGI), a cold rolled steel sheet (CR), a galvanized steel sheet (GI), and combinations thereof. For example, the skin layer 110 may comprise stainless steel (SUS), electrogalvanized steel sheet (EGI), or both, thereby achieving superior structural rigidity, strength, and good formability simultaneously .

In the sandwich panel 100, the thickness of the core layer 120 may be about 0.5 mm to about 2 mm. By having the thickness within the above range, excellent structural rigidity and strength can be realized without excessively increasing the total thickness of the sandwich panel 100.

The thickness of the skin layer 110 may be about 0.1 mm to about 1 mm. By having the thickness within the above range, the total thickness of the sandwich panel 100 can be made lightweight while maintaining the structural rigidity and strength at an excellent level without excessively increasing the total thickness of the sandwich panel 100.

In one embodiment, the molded article may be applied, for example, to a back cover of a display device or to the use of an automotive interior or exterior material.

Specifically, the molded article can be applied to the use of a back cover of an image display device. The image display device may be a television, a computer, a mobile communication terminal, a car navigation system, or a head-up display device for a vehicle, but is not limited thereto.

More specifically, the molded product can be applied to the use of the back cover of the organic light emitting display device. Since the organic light emitting display device does not require a backlight source and is fabricated from a display device panel using its own light source, the back cover of the organic light emitting display device plays an important role in slimming down and lightening. Therefore, And the weight is reduced to realize a slimmer and lighter weight, the moldability is improved while maintaining a good level of structural stiffness and strength, and an excellent surface appearance can be realized.

In addition, the molded product may be applied to interior and exterior materials of automobiles as a rear panel, a dash panel, a door panel, a bumper panel or a trunk panel. However, the molded product is not limited thereto. It is possible to realize excellent structural rigidity, strength and excellent moldability while realizing weight saving.

3 is a schematic process flow diagram of a method of forming a sandwich panel in accordance with another embodiment of the present invention.

In another embodiment of the present invention, there is provided a method for fabricating a semiconductor device, comprising: (S1) preparing a sandwich panel comprising a skin layer on both sides of a core layer; And a step (S2) of forming the sandwich panel integrally with a molded product including a round portion formed with a predetermined three-dimensional radius of curvature (S2). The sandwich panel is as described above in one embodiment and the sandwich panel can be integrally molded by the method of molding the sandwich panel to produce the molded article described above in one embodiment.

The moldability is improved by applying the predetermined three-dimensional radius of curvature in molding the sandwich panel including the core layer and the skin layer laminated on both sides of the core layer, Since the sandwich panel itself can be integrally formed without having to separately fabricate and adhere thereto, it is possible to realize excellent moldability and excellent surface appearance, and to maintain excellent structural rigidity, strength and weight.

Further, the manufacturing process for forming the sandwich panel by molding the sandwich panel is simplified, thereby further reducing time and cost, thereby effectively improving the fairness, economy, and productivity.

For example, the sandwich panel can be integrally formed by press working. The pressing is as described above in one embodiment. FIG. 4 is a schematic view showing a process of forming a molded article by performing a drawing process using a press apparatus.

The pressing may be performed under a pressure condition of, for example, about 0.2 MPa to about 1.0 MPa. By performing the pressure within the above-mentioned range, the sandwich panel can be easily formed into a predetermined shape and the damage of the sandwich panel can be prevented.

Further, the pressing may be performed under a temperature condition of, for example, about 50 캜 to about 150 캜. By performing at a temperature in the above range, excellent moldability can be realized and damage to the sandwich panel can be prevented.

Accordingly, the sandwich panel may be integrally formed into a cover shape or a container shape including a bottom surface and a side surface, and the boundary portion connecting the bottom surface and the side surface may be a rounded part.

For example, the cover shape or the container shape may include a hollow cylindrical shape, a hollow square shape, or both of them. The hollow square shape is a prismatic shape having an empty interior, for example, a hollow cubic shape, a hollow rectangular shape .

In addition, the bottom surface and the side surface may each have at least one shape selected from the group consisting of a planar shape, a concave shape, a convex shape, and a combination thereof, and are not particularly limited. And may be formed to include various shapes.

In the molding method, the molding can be integrally formed so that the radius of curvature Rh in the horizontal axis of the round portion is formed to be about 3 mm to about 10 mm. Accordingly, when the sandwich panel is molded, a difference in tensile strength between the core layer and the skin layer is lowered so that they are not desorbed or peeled off from each other.

In addition, the curvature radius Rv of the round portion in the vertical axis can be integrally formed so as to be, for example, about 0.5 mm to about 5 mm, and more specifically, about 2 mm to about 5 mm . Accordingly, when the sandwich panel is molded, a difference in tensile strength between the core layer and the skin layer is lowered so that they are not desorbed or peeled off from each other.

Further, the radius of curvature Rd in the diagonal axis of the round portion is approximately the same as described above in one embodiment.

In preparing the sandwich panel, the core layer may be formed of a material containing a fibrous filler. For example, the core layer may be formed of a material including a viscous resin and the fibrous filler.

Also, for example, the fibrous filler may be included in the core layer by flocking, flocked according to methods known in the art, and may be flocked, for example, by electrostatic flock processing, But is not limited thereto.

Thereby, the sandwich panel is advantageous in that it can effectively prevent wrinkles or fatigue phenomenon when the sandwich panel is integrally formed while maintaining a high level of rigidity and strength.

In the step of forming the molded article, for example, the sandwich panel may be integrally molded to manufacture a back cover of a display device or an automobile interior and exterior material.

The display device may be an image display device, and the image display device may be a television, a computer, a mobile communication terminal, a car navigation system, or a head-up display device for a vehicle.

Specifically, the back cover of the organic light emitting display device can be manufactured by integrally molding the sandwich panel. Since the organic light emitting display device does not require a backlight source and is fabricated from a display device panel using its own light source, the back cover of the organic light emitting display device plays an important role in slimming down and lightening. Therefore, And the weight is reduced to realize a slimmer and lighter weight, the moldability is improved while maintaining a good level of structural stiffness and strength, and an excellent surface appearance can be realized.

The interior and exterior materials of the automobile may be a rear panel, a dash panel, a door panel, a bumper panel, or a trunk panel. However, the present invention is not limited thereto. , There is an advantage that excellent moldability can be realized.

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 the present invention should not be limited thereto.

Example

Example  One

A sandwich panel including a skin layer made of stainless steel (SUS) having a thickness of 0.35 mm was prepared on both sides of a core layer of an epoxy resin material having a thickness of 0.6 mm.

Drawing processing was performed at a predetermined curvature radius under the conditions of 25 DEG C and 0.3 MPa using a press apparatus and the sandwich panel was integrally molded to form a rectangular tube shape including four round portions formed with a predetermined three- . The predetermined three-dimensional radius of curvature was 5 mm for the horizontal axis inner radius of curvature Rh and 3 mm for the vertical axis inner radius of curvature Rv.

Example  2

A sandwich panel comprising a stainless steel (SUS) skin layer having a thickness of 0.6 mm and a thickness of 0.35 mm on both sides of a core layer made of a material containing 40% by weight of an epoxy resin and 60% by weight of a polyamide fiber filler A rectangular tube-shaped molding including four round portions formed at a predetermined three-dimensional radius of curvature was produced under the same conditions and in the same manner as in Example 1, The predetermined three-dimensional radius of curvature was 5 mm for the horizontal axis inner radius of curvature Rh and 3 mm for the vertical axis inner radius of curvature Rv. 5 shows an image photograph of the molding according to the second embodiment.

Example  3

A sandwich panel comprising a stainless steel (SUS) skin layer having a thickness of 0.6 mm and a thickness of 0.35 mm on both sides of a core layer made of a material containing 40% by weight of an epoxy resin and 60% by weight of a polyamide fiber filler A rectangular tube-shaped molding including four round portions formed at a predetermined three-dimensional radius of curvature was produced under the same conditions and in the same manner as in Example 1, The predetermined three-dimensional curvature radius was 9 mm in the horizontal axis inner radius of curvature Rh and 5 mm in the vertical axis inner radius of curvature Rv. 6 shows an image photograph of the molding according to the third embodiment.

Comparative Example  One

A sandwich panel including a skin layer made of stainless steel (SUS) having a thickness of 0.35 mm was prepared on both sides of a core layer of an epoxy resin material having a thickness of 0.6 mm.

The sandwich panel was integrally molded by performing a right angle drawing without applying a predetermined radius of curvature under the conditions of 100 DEG C and 0.3 MPa using a press apparatus so that the x, y, and z axes were vertical And the four vertical portions which meet with each other. 7 shows an image photograph of the molded article according to Comparative Example 1. Fig.

Experimental Example

The respective properties of the sandwich panel and the molded article according to Examples 1-3 and Comparative Example 1 were evaluated and are shown in Table 1 below.

Assessment Methods

(Moldability and surface appearance)

Measurement method: The rims of each of the molded products according to Examples 1-3 and Comparative Example 1 were observed with naked eyes to determine whether wrinkles or frizzing occurred on the inner skin layer, thereby evaluating moldability and surface appearance .

Concretely, a case in which wrinkles or burning occurred remarkably and the formability and surface appearance were inferior was indicated as " X ", and a case in which wrinkles or friability were slightly generated and the formability and surface appearance were normal were indicated as " , And no wrinkling or fraying occurred at all, thereby showing a case where the moldability and surface appearance were excellent.

(Inner radius of curvature)

Measurement method: The curvature radius Rh and the radius of curvature Rv of the vertical axis of each round part of the molded product according to the example 1-3 were measured using a curvature gauge (Mitutoyo, 186-106). In addition, the horizontal axis inner curvature radius Rh and the vertical axis inner radius of curvature Rv of each corner part of the molded product according to Comparative Example 1 were measured.

Moldability and surface appearance Inner radius of curvature Example 1 △ Horizontal axis: 5mm
Vertical axis: 3mm Example 2 ○ Horizontal axis: 5mm
Vertical axis: 3mm Example 3 ○ Horizontal axis: 9mm
Vertical axis: 5mm Comparative Example 1 X Horizontal axis: 0mm
Vertical axis: 0 mm

As shown in Table 1, it was clearly confirmed that the molded article according to Example 1-3 had excellent moldability and surface appearance while maintaining excellent structural rigidity, strength and light weight, and had a good or excellent level. In addition, the molded product according to Example 1-3 was simplified in manufacturing process, and the time and cost were further reduced, thereby effectively improving the fairness, economy, and productivity.

On the other hand, in the molded article according to Comparative Example 1, since the plastic strain of the skin layer and the core layer was greatly different, the skin layer and the core layer were detached from the round portion during the perpendicular drawing process, Sex and surface appearance were very inferior.

100, 400: Moldings of sandwich panels
110: Skin layer
120: core layer
401: Die
402: punch
403: Blank

Claims (18)

A sandwich panel including a core layer and a skin layer laminated on both surfaces of the core layer is integrally formed in a cover shape including a bottom surface and a side surface to form a round portion which is a boundary portion connecting the bottom surface and the side surface, Section has a three-dimensional radius of curvature consisting of a horizontal axis inner radius of curvature Rh and a vertical axis inner radius of curvature Rv
Moldings of sandwich panels.
The method according to claim 1,
Wherein the horizontal axis inner curvature radius Rh is 3 mm to 10 mm
Moldings of sandwich panels.
The method according to claim 1,
Wherein the vertical axis inner curvature radius Rv is 0.5 mm to 5 mm
Moldings of sandwich panels.
delete The method according to claim 1,
The cover shape may be a hollow cylindrical shape or a hollow square
Moldings of sandwich panels.
The method according to claim 1,
Wherein the core layer comprises a fibrous filler
Moldings of sandwich panels.
The method according to claim 6,
Wherein the core layer comprises 50% to 70% by weight of the fibrous filler
Moldings of sandwich panels.
delete The method according to claim 1,
Wherein the core layer comprises a thermosetting resin, a thermoplastic resin,
Moldings of sandwich panels.
delete delete delete The method according to claim 1,
Applicable for use as back cover of video display or interior and exterior of automobile
Moldings of sandwich panels.
The method according to claim 1,
The sandwich panel is integrally formed by press working
Moldings of sandwich panels.
Preparing a sandwich panel comprising a skin layer on both sides of the core layer; And
Integrally molding the sandwich panel into a cover shape including a bottom surface and a side surface; And
And machining the round portion as a boundary portion between the bottom surface and the side surface to have a three-dimensional radius of curvature consisting of a horizontal axis inner curvature radius Rh and a vertical axis inner radius of curvature Rv
A method of forming a sandwich panel.
16. The method of claim 15,
And the horizontal axis inner curvature radius Rh is formed to be 3 mm to 10 mm
A method of forming a sandwich panel.
16. The method of claim 15,
And the vertical axis inner radius of curvature (Rv) is formed to be 0.5 mm to 5 mm
A method of forming a sandwich panel.
16. The method of claim 15,
In the step of preparing the sandwich panel, the core layer is formed of a material containing a fibrous filler
A method of forming a sandwich panel.

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