KR20020022066A - Sound-insulating sandwich element - Google Patents

Abstract

A multilayered, sound insulating, mechanically strong sandwich element comprising two facing layers (1) substantially attached to a plastic foam core consisting of at least two layers (2) which are joined through contact points (also called bridges) (3) creating a gap or gaps (4) between the core layers (2) and, in case of long spans and/or thin facing layers, travel stops inside the gap/gaps (4) to keep the core layers (2) at a certain distance from each other, wherein the core layer material is a semi-rigid, cellular material containing more than 50 % open cells, and has a tensile strength of more than 50 kPa, and has a compressive strength from 5 to 200 kPa, at 10 % deformation. The distance between the contact points or bridges (3) is at least 350 mm. The new sandwich element can be used as a sound insulating door, a partition element or a construction unit. <IMAGE> <IMAGE> <IMAGE>

Description

[0001] The present invention relates to a sound-insulating sandwich element,

The present invention relates to a sandwich-type soundproofing member, more particularly to a door comprising an open-celled semi-rigid foam core consisting of one or more core materials, a hollow or air gap located in the core, and two outer facing layers, Wall, or ceiling of a building or part of a multi-layered soundproofing construction or construction.

More particularly, the present invention relates to a door, partition wall member, wall, ceiling, floor, partition, bulkhead, fire door, lid, flap, And a panel or the like. The novel sandwich members are useful for improving the sound insulation performance in the building, construction industry or other industries. In addition, the present invention relates to a soundproofing element whose structural simplicity, mechanical strength and rigidity surpasses those of the prior art, and to a wall, bulkhead, ceiling and other parts of buildings, structures or machines for construction or other acoustical improvement Layer sandwich type soundproofing member of the present invention.

In the construction industry, it is well known to use panels as bulkheads to divide the entire area of a building into individual areas such as rooms and offices. Typically, it consists of an insulated mineral fiber core, and two outer layers of cores and an outer layer comprising voids or hollows. Insulation materials such as mineral fibers are arranged between the outer layers to provide insulation and / or sound insulation.

Use of multilayer sandwich-type soundproofing members, laminates or boards containing mineral fibers fixed to walls or ceilings as insulation, septa partition members or panels as intended to reduce sound transmission and transmission and sound emission of sound and noise are also known . By applying a soundproofing member to a wall or a ceiling or by using it as a partition wall member, it is possible to upgrade these buildings by improving the soundproofing performance of residential or office buildings. Thus, old buildings can often be adjusted to conform to higher modern regulatory standards. It is possible to substantially reduce noise from neighboring or external causes or from indoor noise.

However, a major disadvantage of such bulkheads or panels, including mineral fiber cores, is their lack of mechanical strength. For this reason, the outer layer must be protected by, for example, screws or frames and supported by metal or wood studs. This requires extensive manufacturing processes.

Japanese Patent No. 0221642 discloses a soundproof panel in which a porous material such as a glass wood or foam synthetic resin is laminated between outer layers formed of a laminate board, a gypsum board or an acrylic plate so as not to be in contact with one or more surface materials have. In accordance with the teachings of the present specification, the frame should be used to stabilize or fix this condition. These frames are fixed to the above assemblies to form panels. This, of course, is a relatively expensive and expensive process. Moreover, this is a well-known method which is presumed from a typical neck wall or panel.

German Patent Application No. 3 710 057 discloses a multi-layer soundproof panel for an inner wall in which a gap exists between a mineral surface layer and an outer layer of an outer chipboard. Such soundproofing panels include a main panel made from a chip board that is separated from the outer layer by ribs, or a cover panel also made from a chip board. The inner surfaces of these two panels are covered with a fiber board that is fixed in place with a glue. In order to achieve excellent sound-dampening performance, the two fiber boards differ in weight. The multilayer panel consists of five layers, that is, two chipboard layers adhered to each fiber board, and a mineral surface layer at the center of the sandwich which acts as a soundproofing material. The mineral surface is only partially filled in such a way that voids are provided between the mineral surface and one of the fiber boards bonded to the inner surface of the cover panel. The latter is secured to the lip by a screw. As can be seen from the description, the design of such a multi-layered panel is very complex. Therefore, its processing is relatively expensive. Acoustic performance is achieved only by increasing the mass of the panel to such an extent that it is difficult to transport and install the panel.

According to several proposals, organic plastics, for example, well known open-celled polyurethane foam laminates have been used instead of mineral fibers. However, such a laminated board has a disadvantage of being brittle and having a poor tensile strength (about 30 kPa).

U.S. Patent No. 4,317,503 describes a member for soundproofing construction wherein the inner thick first member comprises a plurality of parallel layer members comprising a mineral fiber or a rigid plastic foam layer and containing a plurality of cavities. The inner rigid second member, which is substantially air permeable, is connected to one main surface of the first inner member and the outer non-permeable member. The outer impermeable member is arranged at small intervals from the second inner member in such a manner that substantially the entire outer member reciprocates freely with respect to the second inner member. A major disadvantage of this type of construction member is the complex and costly manufacturing method of such a multi-layer structure.

Other known types of barrier ribs are multilayer structures including those having a foam or a honeycomb core. However, although the foam core has suitable mechanical strength properties, it is very poor as long as the sound insulation properties are taken into consideration. To overcome this problem, the foam core will be unacceptable in thickness and weight.

Generally speaking, there are several known system types that increase the sound insulation performance of a wall as follows:

Of course, the most basic way to provide better sound insulation is to increase the mass of the wall (mass law)

A system using an elastic panel or sandwich structure in which parts, i. E. The outer layer or layers, and the core layer are vibrated irrespective of whether the part or the majority of the incident acoustic energy is converted into mechanical energy and are scattered through internal friction and deformation [ A mass-spring-mass system].

A disadvantage to increasing the mass of a wall or any similar structure according to the mass law is that a heavy and thick structure is required for good performance.

A disadvantage of a typical mass-spring-mass system is that its resonant frequency often interferes with overall performance if the system is misplaced and too sharp.

A better result is obtained using the soundproofing member or panel described in WO 95/14136. Such a multilayer insulating panel or member is preferably made of a single, continuous, soft, synthetic foam core layer having two external layers (a) and cavities in a preferred embodiment, in another pattern in intimate contact with both outer layers Including the soft synthetic core material being arranged, to provide a gap between the core layer and the opposite outer layer.

Substantially described in the specification, drawings, claims and abstract of WO 95/14136 are:

Two outer layers, for example a sandwich-like member comprising a core material between the gypsum board and the outer layer,

A core layer comprising an elastic, closed cell polyethylene foam, a rigid closed celled polyurethane foam or other closed cell plastic foam, for example a polyvinyl chloride or polystyrene based foam,

The second outer layer may be a brick structure, and thus the core layer here indirectly represents a wall that can be adhered, for example, to a mortar,

The core layer contains cavities of a specific geometric arrangement and there is a gap between the core layer and the outer layer,

The gaps are confined between the core layer and the outer layer by contact points or regions arranged in another pattern with respect to the opposite outer surface,

The experimental and theoretical considerations apply to the best results in a mass-spring-mass system.

The panel described in WO 95/14136 has both sound insulation properties and mechanical strength. Although lighter and cheaper panels with superior acoustic properties are provided in the prior art compared to previously known products, it is also possible to provide both an interior bulkhead member and a sandwich member, such as a door and door, It is still highly desirable to provide bulkheads, which will be particularly useful for upgrading residential and office buildings and devising bulkheads with improved soundproofing performance. In addition, a more economical method for manufacturing and installing such soundproofing panels was needed.

Prior European Patent Application No. 98 111 295.6-2303 discloses an outer layer, a plastic foam core layer attached to an outer layer, wherein the core material is a radially foamed material having specific characteristics. A structure in which the core layer is fixed at a separate contact point (generally referred to as " contact point ") by strips, patches, dabs or other geometric projections leaving a gap between the core layer and the structure, and a long span and / Layer soundproof panel comprising a travel stop that maintains the core layer at a certain distance from the structure.

Panels according to European Patent Application No. 98 111 295.6-2303 are useful for improving the sound insulation properties of buildings and / or machinery in construction and other industries.

Such sandwich members are generally suitable as septum members, but their mechanical strength is not sufficient for applications where strength and resistance are particularly important for the applicability of construction members, for example in the construction of doors or walls, It can not be sufficient due to the presence of.

These and other needs are met by the present invention. Accordingly, the present invention comprises a plastic foam core (the core having one or more cavities) located between the outer layer and the outer layer and attached to the outer layer,

Wherein the cavities / cavities are essentially parallel to the outer surface and are located in the core,

The core material is a bubble-like material of a radial quality containing at least 50%, preferably at least 90%

A tensile strength of 50 kPa or more, preferably 90 kPa or more,

And a compressive strength of 5 to 200 kPa, preferably 15 to 80 kPa at 10% strain, is provided.

In a preferred embodiment of the present invention, the gaps or gaps are formed between the two core layers and the core layer while providing a structural bond between the core layers while maintaining the core layer in a separate state and creating gaps or gaps between the core layers. A sandwich-type member is provided which is defined by a contact point, also referred to as a " bridge ".

The distance between the contact points is preferably at least 350 mm, more preferably at least 450 mm, or even at least 600 mm, as long as mechanical integrity can be preserved.

The thickness of the outer layer may each be 0.5 to 100 mm, preferably 0.5 to 25 mm. The outer layer material may be a metal sheet 0.5 to 20 mm thick, preferably steel or aluminum or a wood sheet 4 to 25 mm thick. Other materials useful in certain applications are known to those skilled in the art.

The thickness of the foam core layer is 20 to 500 mm, preferably 20 to 300 mm, and more preferably 200 mm or less. Each foam core layer generally has a minimum thickness of 10 mm, preferably a thickness of 15 to 100 mm, in order to achieve significant cushioning. However, these ranges should not be construed as limiting. Values in excess of this range may also be suitable for certain applications, for example, those requiring very high sound damping performance.

The foam core layer may be of the same thickness or may not be of the same thickness. It has been found advantageous to use different thicknesses to minimize the negative effects of significant characteristic frequencies of the assemblies made from the outer layer and the core layer in some cases of the outer surface material.

Preferably, the core layer material is a polyurethane foam of the type described, for example, in U.S. Patent No. 5,538,779.

The core layer material may comprise more than one type of foam. For example, it may comprise polyethylene or polystyrene in addition to polyurethane. It may also include heavy plastics or sheets made of non-toxic or other materials.

The core layer material in the preferred embodiment is an air flow resistivity of 5,000 to 800,000Ns / m ^4, preferably 5000 to 300,000Ns / m ^4.

The loss factor of the core layer material is preferably at least 0.1, more preferably at least 0.2 (defined by SAE Sound and Heat Insulation Materials Committee, SAE Handbook, 1994, Volume 1, page 2.30) The loss rate can reach 0.3 or more.

For long interlevel and / or thin outer layers, a walkthrough is provided in one or more core layers and in the interstices to ensure that the core layers are always kept at a certain distance from each other.

The distance from the opposite core layer to the travel stop or the distance from each other to the core layer is preferably 0.1 mm or more at 0% strain, and the preferable range is 2 to 10 mm.

In a preferred embodiment, the total area of the contact points is less than 30%, preferably less than 15% of the total area of the sandwich-like member.

In a preferred embodiment, the contact points are plastic foams, plastic, metal or wood strips having a thickness of 0.5 to 100 mm and a width of 10 to 100 mm. However, such a range should not be construed as limiting, and may depend on the particular stress requirements of the application and the stiffness of the external surface. A very hard outer surface would allow, for example, voids of unspecified thickness. The protrusions or other structural members of the core layer, for example door frames, can also function as contact points or " bridges. &Quot;

Further, the present invention relates to a method of manufacturing a novel sandwich type soundproofing member by attaching an outer layer to a plastic foam core, wherein a plastic foam core is formed by joining two core layers through a contact point or bridge having a predetermined distance, The two core layers are first machined such that the contact points or the bridges are formed at predetermined distances as internal components of the core layer and then the two core layers are bonded to each other through contact points or bridges to form inter- Characterized in that it is produced by leaving gaps or by cutting gaps or gaps from a single plastic foam board.

Furthermore, the present invention provides the use of a novel sandwich type soundproofing member in construction and other industries to improve the soundproofing properties of buildings and / or machinery.

A particularly surprising feature of the present invention is that the long span oscillation of the core layer attached to the outer layer provides excellent cushioning at all frequencies, particularly resonance frequencies and critical frequencies.

The gaps generated in the foam core can be significantly changed depending on the actual need at given conditions. A very hard outer surface will allow voids of unspecified thickness. The thickness is typically in the range of 0.1 to 200 mm. Sometimes, the thickness is chosen to be between 20 and 50 mm so that cables, pipes and other service lines can pass through. Unless otherwise specially considered, the thickness of the gap is often in the range of 1 to 10 mm, more preferably 2 to 5 mm.

For example, in the case of a plasterboard (or a board made of other materials that are sufficiently rigid) used as an outer layer, for example, if the plasterboard is 10 mm thick, span is more than 400 mm, thickness is 13 mm, span is more than 600 mm, The manufactured " intermediate span " travelstop system can be installed to limit the deformation of the gypsum board. For example, if a 1200 mm wide plasterboard laminate is installed with a contact point (strip) of 40 mm wide at the edge of the board, this gives an empty span of 1120 mm to secure the travel stop strip in the middle of the board . The width of the travel stop strip is 30 to 39.9 mm, more preferably 35 to 38 mm, when the contact strip width is, for example, 40 mm.

It will be appreciated that when the present invention is implemented by attaching with parameters as defined in the specification and claims, particularly using specific foam materials and applying specific designs for the core layer, outer layer (s) and travelstops, A sandwich-type soundproofing member having a surprisingly high vibration-damping property at a resonance frequency and having high mechanical strength and rigidity is produced, which means that the new member can be carried and handled without any particular damage risk. Thus, there is no need to further strengthen the mechanical integrity of the assembly, for example by screwing, framing or trimming.

Nevertheless, once the part is in place, it may incorporate other connecting or strengthening devices in the joints, before, during, or within the member to ensure that certain application requirements are met. The design arrangement prevents any sound that may be generated from crossing, while also meeting the strength requirements to be used. Which is known to those skilled in the art.

Typical reinforcements are wood or metal frames for application to doors, steel ties between panels for application to bulkheads, or mortar or glue for application to beams and walls.

The outer surface can typically be made of any material used to make a sandwich-type insulating member or panel. Examples of materials useful as the exterior surface include plastic or particulate boards, thick paper or cardboard, fiber boards, gypsum plaster boards, flexible plastic films or foils, metal sheets (e.g., steel, lead or aluminum sheets), plywood, And chip boards, the most common being plaster gypsum boards and chip boards. Preferred materials for use as exterior surfaces are metal sheets or wood boards for gypsum board and door applications for bulkhead applications.

In one embodiment of the present invention, a core layer made from a polyurethane foam having individual polyurethane foam patches as contact points on one of its two sides is bonded to the other polyurethane foam core layer To form a core. Typically, such panels prevent preassembly at the installation site by preliminary processing. Subsequently, the core is fixed to two outer layers by bonding or mechanically fixing the core with a suitable adhesive such as a polyurethane glue, a neoprene pressure-sensitive adhesive or a transfer adhesive, thereby producing the sandwich-type member according to the present invention.

The thus obtained sandwich member can be used, for example, as a door. The exterior facing material for the door is a thin layer of metal sheet or wood sheet and is substantially attached to the core layer to meet requirements such as thermal stability, impact resistance, fully planar surface and aesthetics. It is therefore important that no gap be created between the reinforced foam core and the outer layer if the outer layer is lacking in rigidity.

Moreover, it is advantageous to substantially adhere between the outer layer and the core layer, for example, with an adhesive, so long as the highly bufferable core material used according to the present invention strongly reduces shock and vibration transmission.

The novel sandwich-like member may also be used, for example, as an independently existing interior bulkhead. These septum members are typically secured to the floor and / or ceiling. It can be secured to walls, ceilings, floors or other building structures.

The sandwich-type bulkhead concept for the present invention relates to space division units in most offices, industrial cabins and other applications where a combination of lightweight, easy to connect, handle and soundproofing is an important requirement. Such a barrier may be in a vertical or horizontal position, but in some embodiments it may be positioned at an acute or obtuse angle.

Surprisingly, it has been found that significant sound insulation performance can be achieved by incorporating specific contact points or bridges into the core resulting in voids or pores that are an important feature of the present invention.

The contact points can be machined from a polyurethane foam layer or made from other suitable materials such as plastics, glue or other adhesives, wood, plaster or metal other than polyurethane, as long as they meet the criteria of the present invention.

In addition to the door and bulkhead applications of sandwich members according to the present invention, another aspect of the invention is a panel useful for construction unit applications. In the present application, the novel sandwich-like member functions as a building wall, ceiling, floor or any other building component or brick of a unit.

The sandwich type soundproofing member of the present invention is not only particularly useful for modifying an existing building but also as a member of a new building. It can be manufactured as a door or septum member or a wall construction unit. This provides a thin, lightweight, mechanically strong solution to improve soundproofing and eliminates or cushions sound and noise transmitted through walls, doors, floors, ceilings and bulkheads without a soundproofing element.

On the basis of the examples, it will be appreciated that the sandwich members according to the present invention are substantially better than the prior art soundproofing members in terms of soundproofing / mechanical strength / light weight / thickness characteristics and manufacturing / Proven. This is superior to the sandwich type soundproofing member of the related art in terms of mechanical strength, acoustic damping performance, and resonance frequency. The gap in the core acts as a very soft second spring and the core layer acts as a hard second spring. Due to the hardness of the core layer, deformation of the member is strongly restricted and can be made suitable for the intended use in the building.

The following examples are given to illustrate the invention and should not be construed as limiting the invention in any way.

Example 1

1 schematically shows a sandwich-type member assembly according to the present invention for application as a door. (1) is an outer layer, (2) is a core layer, (3) is a contact point, and in this case, the contact point is T-shaped. Figures 2 and 3 show the two sandwich elements after assembly, the difference of the member according to Figure 3 compared to the member according to Figure 2 is that the third contact point is incorporated.

The member is a polyurethane board having a thickness of 20 mm and a polyurethane board (2) having a thickness of 40 mm (the polyurethane is produced according to the method described in Example 1 of U.S. Patent No. 5,538,779) and a steel sheet 1 having two thicknesses ) Was spray-bonded to the second metal sheet by a pressure-sensitive adhesive (neoprene) at room temperature on a metal sheet and the other board was sprayed and bonded to a T-type contact point 40 mm in width (3) and by joining both assemblies through the T-point contact point (3) and the further point punch point (3 ') as shown in Figure 3. The contact point is a plastic strip with a thickness of 3 mm and a width of 40 mm (eg PE, PU or PVC).

It is noted that the two core layers are different in thickness. This is because the negative effect of the characteristic critical frequency of the outer surface is reduced and the core layer is attached together.

Travelstops can be incorporated as needed.

The air gap 4 is characterized by the thickness produced by the contact point 3 and the distance D. The distance D shown in Figs. 2 and 3 is 350 mm, preferably 450 mm, and most preferably 600 mm or more, so long as the mechanical integrity can be maintained.

The door manufactured according to the present invention achieves excellent dimensional and thermal stability without bending effects at different temperatures. This provides better airtightness than existing structures with insulation and significant impact resistance and triple the weight.

With a suitable choice of core material thickness and stiffness, excellent flatness and aesthetics are achieved with very thin outer surface materials.

Example 2

A sandwich-like member according to the invention is manufactured and tested for its soundproofness.

2.1 - Fig. 4 shows a cross-sectional view and configuration of the test door with dimensions of 1050 mm x 2050 mm x 55 mm (see Fig. 1). The outer surface 1 is a steel sheet having a thickness of 1.5 mm.

The core material 2 is a soundproof foam (The Dow Chemical Company) as previously described in U.S. Patent No. 5,538,779. In the upper half, the thickness (H1) is 15 mm and the lower half (H2) is 35 mm in thickness.

The contact point 3 is made of a 30 mm wide foam strip 5 mm thick and 2050 mm long and a pine tree frame 15 mm wide and 55 mm thick and operated around four sides of the door panel to provide rigid and rigid edges.

As can be seen from the form of Figure 4, the neck frame is entirely adhered to both the foam core and the steel outer surface with a contact neoprene adhesive, while the foam strip is simply placed on top of the core material (2) I do not.

The test item has a measured weight of 57 kg, i.e., only 26 kg / m 2. Total thickness is 58mm.

The door member or the door plate according to the present invention having a cross section as shown in Fig. 4 achieves surprisingly high sound insulation performance despite its very low weight and reduced thickness (deceleration scale A (dB) (R) = 49 dB (A), R _pink = 47 dB (A) and R _{distance noise} = 41 dB (A).

None of these commercially available plates of weight and thickness have reached this level of performance.

This is compared, for example, to a solid concrete with a thickness of 90 mm and a weight of 207 kg / m &lt; 2 &gt; to achieve R = 47 dB sound insulation.

2.2 - Fig. 5 shows the same cross-section of the door, but for the second test, the contact strips 3 at both the center and the sides are glued to both sides of the core material 2 with a pressure-sensitive adhesive. This attachment method allows greater stiffness to the member.

As expected, the reduced distance D between the contact points of 1020 mm (Test 1) to 465 mm (Test 2) has some effect on the sound insulation performance, but is still very high and is within the scope of the present invention.

Rw = 45 dB (A), R _pink = 44 dB (A), R _{distance noise} = 37 dB (A)

2.3 and 2.4 - Figures 6 and 7 show an improved cross section of a door according to the invention, suitable for industrialization.

In Figure 6, the outer surface 1 is relatively rigid or rigid (e.g., plywood plank), so the need to strengthen this type is arbitrary and depends on span D.

The two half portions (two core layers 2) of the core have different thicknesses H1 and H2. The contact point 3 has a cavity 4, and the frame 7 is moved around the door.

2.4 - In Fig. 7, the outer surface 1 is a thin sheet (for example, a steel sheet having a thickness of 0.6 mm). Therefore, it is necessary to strengthen the outer surface by the U profile 6 welded or bonded to the outer surface.

Since this U-shaped profile 6 is tucked into the foam core, its self-oscillating pattern is reduced by the strong buffer capacity of the foam core. It should be understood that other shapes, such as T-shaped profiles or other profiles (from aluminum, steel, plastic or wood), that provide a suitable stiffness effect due to moment of inertia and a certain modulus are also permissible.

The voids 4 are very thin and are produced in the thickness of the metal frame 7, which in some cases replace the strip which is normally used as point stop 3 and form a " bridge " between the core layers. Two layers or half of the core material 2 are of the same thickness (H1 = H2).

Sometimes it is more convenient to operate the strengthening profile (or profiles) parallel to the width, not the height of the sandwich member. Diagonal and transverse arrangements are also acceptable.

Example 3

8 schematically shows an assembly of a sandwich member according to the invention for application as a partition member. The previously assembled sandwich member is shown in Fig. (3) refers to the contact point belonging to the core material core material in this case, because the core layer 1 is the outer layer, (2) is the core layer, and (2)

This new sandwich member is made by bonding together a 25 mm thick polyurethane board 2 (according to U.S. Patent No. 5,538,779) and a 15 mm thick wooden board 1 together with a neoprene-based pressure sensitive adhesive. The contact point forming part of the core body is 15 mm wide.

Preferably, the gaps do not exactly lie at the center of the panel in order to avoid the negative accumulated effects of similar critical frequencies generated by the two outer surfaces, when producing a noise frequency of about 50 to 5000 Hz. In some cases, this effect is not disadvantageous. However, these all depend on the thickness, modulus and buffer factor of the outer surface.

Example 4

In this embodiment, a sandwich member according to the present invention which is applied as a construction unit is disclosed. It is noted with respect to Figure 10 that the core of the member is made of two bonded boards of plastic foaming material which are located centrally or preferably leave a gap 4 outside the center. The sandwich member has an L-shaped clay brick outer surface encapsulating the core 2. The L-shaped outer surface brick creates a second interstice 5 along the vertical edges of the member to provide space for the electrical cable. In another embodiment, the gaps 5 are used to inject the joint mortar.

Another embodiment of a sandwich-like member for application to the manufacture of walls is shown in Fig. The outer surface 1 is made of hollow bricks. A brick cavity, for example, a slot or a round hole, is open to the core of the member. The penetration rate is about 0 to 80%, preferably more than 30%. This arrangement is a feature of the present invention and reduces the resonance frequency of the mass-spring mass system while simultaneously providing some sound absorption advantages.

Claims (18)

A multilayer sandwich-type soundproofing member comprising a plastic foam core disposed between an outer layer and an outer layer and attached to an outer layer and having at least one cavity, Cavities / cavities are essentially parallel to the outer surface and are gaps / gaps located in the core, The core material is a semi-rigid foamed material containing at least 50%, preferably at least 90% A tensile strength of 50 kPa or more, preferably 90 kPa or more, Characterized in that the compressive strength is 5 to 200 kPa, preferably 15 to 80 kPa at 10% strain. The member according to claim 1, characterized in that the interstices / interstices are defined by a contact point (" bridge ") which maintains the core layer in a discrete state while providing a structural bond between the two core layers and the core layer. 3. The member according to claim 1 or 2, wherein the distance between the contact points is at least 350 mm, more preferably at least 450 mm, even more preferably at least 600 mm. The member according to any one of claims 1 to 3, characterized in that the core layer material is a polyurethane foam. The member according to any one of claims 1 to 4, characterized in that the core layer comprises one or more kinds of foams. 6. A member according to any one of claims 1 to 5, characterized in that the thickness of the outer layer is 0.5 to 200 mm each and the thickness of the foam core layer is 5 to 500 mm, preferably 20 to 200 mm. The member according to any one of claims 1 to 6, characterized in that the thickness of the foam core layer is different. The member according to any one of claims 1 to 7, wherein the air flow resistance of the core layer material is 5000 to 800,000 Ns / m ⁴ , preferably 5000 to 300,000 Ns / m ⁴ . The member according to any one of claims 1 to 8, wherein the loss ratio of the core layer material is 0.1 or more, more preferably 0.2 or more. 10. A method according to any one of claims 1 to 9, wherein a travel stop is provided in at least one core layer and in the gap between the long and / or thin outer layers, Wherein the member is kept apart. 11. The member according to claim 10, wherein the distance from the opposite core layer to the travel stop or the distance between the core layers is 0.1 mm or more, preferably 2 to 10 mm at 0% strain. The member according to any one of claims 1 to 11, characterized in that the total area of the contact points is less than 30%, preferably less than 15% of the total area of the sandwich-like member. 13. A member as claimed in claim 1 or 12, characterized in that the outer layer material is a metal sheet, preferably steel or aluminum, or a wood sheet. The member according to claim 2 or 13, wherein the contact point is a plastic foam, plastic, metal or wooden strip having a thickness of 0.5 to 100 mm and a width of 10 to 100 mm. The two core layers are bonded at a predetermined distance through a point-contact point or a bridge so as to leave gaps between the core layers, or the two core layers are machined such that the contact points or the bridges are formed as a whole portion of the core layer at a predetermined distance And then joining the two core layers via contact points or bridges to leave gaps between the core layers or to cut the gaps or gaps from a single foam plastic board to form a plastic foam core, A method for manufacturing a sandwich-like member according to any one of claims 1 to 14 by attaching it to a plastic foam core. 14. Use of a member according to any one of claims 1 to 14 in construction and other industries to improve the sound insulation properties of buildings and / or machinery. 17. Use according to claim 16, characterized in that the member is used as a door, partition member or construction unit. 18. Use according to claim 17, characterized in that the member is used as a clay brick or gypsum plasterstone.