Flooring and composite flooring comprising the same

Abstract

The utility model discloses a floor belongs to floor technical field. The floor includes the base plate, and the base plate edge is equipped with a plurality of connecting components along the length direction and / or width direction, and the connecting component includes the convex part and the recessed part, and the convex part projects outward along the lamination surface, and the convex part has the protruding surface of the curvature radius consistent or inconsistent along the lamination surface, and / or, and the recessed part is recessed inward along the lamination surface, and the recessed part has the recessed surface of the curvature radius consistent or inconsistent along the lamination surface, and the convex part of base plate can be matched with the recessed part of adjacent base plate. Wherein, the part of convex part close to the lamination surface is the widest place of connecting component, and the width of connecting component gradually reduces from the lamination surface inward or outward, and by setting relatively wider connecting component on the lamination surface, it is favorable to increase the contact area between floor, and improve the connection stability.

Description

Technical Field

[0001] This utility model belongs to the field of flooring technology, and more specifically, relates to flooring and composite flooring including the flooring. Background Technology

[0002] Flooring is widely used in home decoration as a building material. Currently, interlocking flooring is still the mainstream type of flooring on the market. During assembly, adhesives are generally used to connect the flooring. However, adhesives can age and cause environmental pollution. Interlocking flooring, which can be installed quickly, often has poor joint strength, which can lead to deformation or cracking at the joints.

[0003] For example, patent application CN111927035 A discloses an integrated bathroom interlocking base plate, the structure of which includes a main panel, a through-hole, and a snap fastener. The through-hole and the main panel are an integrated structure, and the snap fastener is fixed to the outer surface of the main panel, connecting the main panel through the snap fastener. However, this connection structure has low strength and poor stability. Utility Model Content

[0004] 1. The problem to be solved

[0005] The primary objective of this invention is to provide a flooring solution that addresses the problem of poor installation stability in existing flooring systems.

[0006] The second objective of this invention is to provide a composite flooring that includes the flooring.

[0007] 2. Technical Solution

[0008] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0009] A first aspect of this utility model provides a floor, including a base plate, wherein the edge of the base plate is provided with a plurality of connecting members along the length direction and / or the width direction, the connecting members including protrusions and recesses.

[0010] The protrusion protrudes outward along the mating surface, and the protrusion has a protruding surface with a consistent or inconsistent radius of curvature along the mating surface; and / or:

[0011] The recessed portion is recessed inward along the mating surface, and the recessed portion has a recessed surface with a consistent or non-consistent radius of curvature inward along the mating surface.

[0012] This allows the protrusions on the substrate to mate with the recesses on the adjacent substrate.

[0013] The "adhesive surface" mentioned herein refers to the adhesive surface of the floor. The floor of this application consists of a substrate and other parts such as coverings. The adhesive surface of two adjacent floorboards is the adhesive surface of two coverings, such that the connecting parts of the substrate are divided into outwardly protruding protrusions and inwardly recessed recesses along the adhesive surface. The adhesive surface can be a straight line or an arc with protrusions or recesses.

[0014] According to any embodiment of the first aspect of the present invention, the floor further includes a cover and a spacer, the edges of the cover and the spacer forming a mating surface, the protrusions protruding outward along the mating surface, and the recesses recessing inward along the mating surface.

[0015] The covering can be a ceramic tile.

[0016] The "protrusions" and "recesses" described herein refer to a raised portion having a surface with a consistent or inconsistent radius of curvature along the mating surface outwards, and a recessed portion having a surface with a consistent or inconsistent radius of curvature along the mating surface inwards. The inconsistent radius of curvature can be a constant rate of change, a non-constant rate of change, or a combination of multiple rates of change. The portion of the protrusion closest to the mating surface is the widest part of the connecting component. The width of the connecting component gradually decreases from the mating surface inwards or outwards. This is because the connection point of the mating surface is a stress concentration point, making this part prone to deformation or even breakage under stress. By setting a relatively wide connecting component at this point, it is beneficial to increase the contact area between the floorboards and improve the connection stability.

[0017] According to any embodiment of the first aspect of the present invention, the protrusion and the recess are composed of straight lines and / or arcs. That is, the protrusion and the recess can be composed of straight lines, for example, forming a trapezoid or a polygon, preferably a regular polygon, wherein the regular polygon preferably has more than or equal to 5 sides, such as a regular pentagon, a regular hexagon, a regular heptagon, etc., wherein the part of the protrusion near the mating surface is the widest part of the connecting component; the protrusion and the recess can also be composed of curved surfaces, for example, an arc surface with a uniform radius of curvature or an arc surface with a non-uniform radius of curvature; the protrusion and the recess can also be composed of both curved surfaces and straight lines, for example, the part intersecting the mating surface is a straight line and the part away from the mating surface is a curved surface, or the part intersecting the mating surface is a curved surface and the part away from the mating surface is a straight line.

[0018] In one possible implementation, the protrusion is composed of a curved surface having a first arcuate surface, and the recess has a second arcuate surface that mates with the protrusion, such that the protrusion of the substrate can mate with the recess of an adjacent substrate.

[0019] In another possible implementation, the protrusion is composed of curved surfaces and straight lines, including a first straight line segment perpendicular to the bonding surface and a second straight line segment parallel to the bonding surface. The two ends of the second straight line segment are connected by arcs to form a protrusion with the bonding surface. The recess has a second arc surface that mates with the protrusion, allowing the protrusion of the substrate to mate with the recess of an adjacent substrate. To achieve the mating with the first straight line segment of the protrusion, the recess may also have a straight line segment perpendicular to the bonding surface, with the two ends of the arc surface connected to the straight line segment respectively.

[0020] In a third possible implementation, the recess is composed of curved surfaces and straight lines, including a first straight line segment perpendicular to the bonding surface and a second straight line segment parallel to the bonding surface. The two ends of the second straight line segment are connected by arc segments to form a recess with the bonding surface. The protrusion has a second arc surface that mates with the recess, so that the protrusion of the substrate can mate with the recess of the adjacent substrate.

[0021] According to any embodiment of the first aspect of the present invention, the protrusions and recesses are connected, or the protrusions and recesses are spaced apart on the edge of the substrate along the length direction and / or the width direction.

[0022] When the protrusion is composed of curved surfaces having a first arc surface and the recess has a second arc surface that mates with the protrusion, in one possible manner, the first and second arc surfaces that are connected are tangent, and the mating surface passes through the center of the first and second arc surfaces.

[0023] According to any embodiment of the first aspect of the present invention, the radius of curvature R1 of the first arc surface is less than the radius of curvature R2 of the second arc surface, and the central angle θ1 of the first arc surface is less than the central angle θ2 of the second arc surface. For example, the difference between the radius of curvature R1 of the first arc surface and the radius of curvature R2 of the second arc surface is 0.5 to 1.5 mm.

[0024] According to any embodiment of the first aspect of the present invention, the vertical distance between the top end of the first arc surface and the mating surface is less than the vertical distance between the top end of the second arc surface and the mating surface. For example, the vertical distance between the top end of the first arc surface and the mating surface is 6 mm, and the vertical distance between the top end of the second arc surface and the mating surface is 7 mm.

[0025] According to any embodiment of the first aspect of the present invention, the connecting members are continuously distributed along the length and / or width direction of the substrate edge, or the connecting members are spaced apart along the length and / or width direction of the substrate edge. When the connecting members are continuously distributed along the length and / or width direction of the substrate edge, the protrusions and recesses of adjacent connecting members are continuously and uniformly distributed.

[0026] The second aspect of this utility model discloses a flooring, which includes a cover, a substrate, and a spacer. The cover is provided on one side of the substrate, and the spacer is provided on the other side. The edges of the ceramic tile and the spacer form a mating surface. The edge of the substrate has continuously distributed protrusions and recesses along the length and width directions. The protrusions extend outward from the mating surface, and the recesses are recessed inward from the mating surface. In one possible implementation, the protrusions are composed of curved surfaces having a first arc surface, and the recesses have a second arc surface that mates with the protrusions, so that the protrusions of the substrate can mate with the recesses of adjacent substrates.

[0027] In another possible implementation, the protrusion is composed of curved surfaces and straight lines, including a first straight line segment perpendicular to the bonding surface and a second straight line segment parallel to the bonding surface. The two ends of the second straight line segment are connected by arcs to form a protrusion with the bonding surface. The recess has a second arc surface that mates with the protrusion, allowing the protrusion of the substrate to mate with the recess of an adjacent substrate. To achieve the mate with the first straight line segment of the protrusion, the recess may also have a straight line segment perpendicular to the bonding surface, with the two ends of the second arc surface connected to the straight line segment respectively.

[0028] According to any embodiment of the second aspect of the present invention, the first arc surface and the second arc surface are tangent.

[0029] The third aspect of this utility model discloses a composite floor, which includes a plurality of the above-mentioned floorboards, the floorboards being bonded together, wherein adjacent protrusions and recesses are bonded / close to each other.

[0030] According to any embodiment of the third aspect of the present invention, a gap is formed between adjacent protrusions and recesses.

[0031] According to any embodiment of the third aspect of the present invention, the gap between adjacent protrusions and recesses is 0.5 to 1.5 mm.

[0032] In one possible implementation, the protrusion is composed of a curved surface having a first arcuate surface, and the recess has a second arcuate surface that mates with the protrusion, with a gap forming between the first and second arcuate surfaces. The gap between the first and second arcuate surfaces is, for example, 0.5–1.5 mm.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0035] (1) This utility model provides a number of connecting parts along the length and / or width direction on the edge of the substrate. The connecting parts include protrusions and recesses. The part of the protrusion near the mating surface is the widest part of the connecting part. The width of the connecting part gradually decreases from the mating surface inward or outward. By setting relatively wide connecting parts on the mating surface, it is beneficial to increase the contact area between the floorboards and improve the connection stability.

[0036] (2) The protrusion of the substrate of this utility model can form a gap with the recess of the adjacent substrate. This gap can effectively alleviate the dimensional error caused by thermal expansion and contraction. It is especially suitable for floor expansion when the floor is heated, and can effectively alleviate the deformation caused by substrate compression.

[0037] (3) The protrusions and recesses of the substrate of this utility model can be provided with straight segments perpendicular to the bonding surface, so that the substrate is blocked in the direction perpendicular to the bonding surface, preventing it from sliding along a certain inclined surface. It has higher structural stability and the floor is not easy to slide against each other after installation. Attached Figure Description

[0038] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this utility model. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0039] Figure 1 This is a schematic diagram of the floor structure in Example 1;

[0040] Figure 2 This is a schematic diagram of the floor structure breakdown in Example 1;

[0041] Figure 3 This is a schematic diagram of the substrate structure in Example 1;

[0042] Figure 4 This is a schematic diagram of the assembled floor structure in Example 1;

[0043] Figure 5 This is an enlarged view of the connecting component structure in Example 1;

[0044] Figure 6 This is a schematic diagram of the floor structure in Example 2;

[0045] Figure 7 This is a schematic diagram of the floor structure after assembly in Example 2;

[0046] Figure 8 This is an enlarged view of the connecting component structure in Example 2;

[0047] Figure 9This is a schematic diagram of the protrusion and recess structure in Example 2;

[0048] In the picture:

[0049] 1. Covering components;

[0050] 2. Substrate; 21. Connecting component; 22. Protrusion; 221. First arc surface; 222. First straight segment A; 223. Arc segment A; 224. Second straight segment A; 23. Recess; 231. Second arc surface;

[0051] 3. Spacers;

[0052] a. Adhesive surface;

[0053] b. Gap. Detailed Implementation

[0054] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form part of the description, illustrating exemplary embodiments in which the present invention may be implemented. Although these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments may be implemented and various changes may be made to the present invention without departing from the spirit and scope thereof. The more detailed description of embodiments of the present invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and does not limit the description of the features and characteristics of the invention, in order to suggest the best mode for carrying out the invention and sufficient to enable those skilled in the art to implement it. Therefore, the scope of the present invention is defined only by the appended claims.

[0055] It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention. As used herein, the terms "parallel" and "perpendicular" are not limited to their strict geometric definitions, but include tolerance for reasonable and inconsistent machining or human errors.

[0056] Example 1

[0057] One type of flooring in this embodiment, such as Figures 1-4 As shown, it includes a cover 1, a substrate 2, and a spacer 3. The cover 1 is a ceramic tile. The cover 1 and the spacer 3 are respectively disposed on both sides of the substrate 2 and are attached to the substrate 2 to form a floor. Adjacent floor panels are attached to each other, and the edges of the cover 1 and the spacer 3 form a bonding surface a.

[0058] The structure of substrate 2 is as follows Figure 3As shown, a plurality of connecting members 21 are provided along the length and width directions of the edge of the substrate 2, and the connecting members 21 are continuously distributed along the length and width directions of the edge of the substrate 2. When the connecting members 21 are continuously distributed along the length and width directions of the edge of the substrate 2, the protrusions and recesses 23 of two adjacent connecting members 21 are continuously and uniformly distributed.

[0059] The connecting component 21 is as follows Figure 5 As shown, the substrate 2 includes interconnected protrusions 22 and recesses 23. The protrusions 22 protrude outward along the mating surface a and are composed of curved surfaces, having a first arc surface 221. The recesses 23 have a second arc surface 231 that mates with the protrusions 22, allowing the protrusions 22 of the substrate 2 to mate with the recesses 23 of adjacent substrates 2. The first arc surface 221 is formed by arcs with the same radius of curvature, and the second arc surface 231 is formed by arcs with the same radius of curvature.

[0060] Among them, the part of the first arc surface 221 and the second arc surface 231 near the mating surface a is the widest part of the connecting component 21. From the mating surface a inward or outward, the width of the connecting component 21 gradually decreases. The reason is that the connection point of the mating surface a is a stress concentration point. This part is prone to deformation or even breakage under stress. By setting a relatively wide connecting component 21 at this point, it is beneficial to increase the contact area between the floorboards and improve the connection stability.

[0061] In one possible implementation, the first arc surface 221 and the second arc surface 231 are tangent to each other, and the mating surface a passes through the centers of the first arc surface 221 and the second arc surface 231. Furthermore, the radius of curvature R1 of the first arc surface 221 is less than the radius of curvature R2 of the second arc surface 231; for example, the difference between the radius of curvature R1 of the first arc surface 221 and the radius of curvature R2 of the second arc surface 231 is 0.5 to 1.5 mm. The central angle θ1 of the first arc surface 221 is less than the central angle θ2 of the second arc surface 231.

[0062] The vertical distance between the top end of the first arc surface 221 and the mating surface a is less than the vertical distance between the top end of the second arc surface 231 and the mating surface a. For example, the vertical distance between the top end of the first arc surface 221 and the mating surface a is 6 mm, and the vertical distance between the top end of the second arc surface 231 and the mating surface a is 7 mm. This ensures that when the protrusion 22 of the substrate 2 can mate with the recess 23 of the adjacent substrate 2, a gap b of 0.5 to 1.5 mm is always maintained between the first arc surface 221 of the protrusion 22 and the second arc surface 231 of the adjacent substrate 2. The reason is that the bonding surface a of the floor is based on the edges of the cover 1 and the spacer 3. When two adjacent floorboards are bonded together, the cover 1 and the spacer 3 are bonded together, and the first arc surface 221 of the substrate 2 is close to the second arc surface 231 of the adjacent substrate 2, with a gap b. This gap b can effectively alleviate the dimensional error caused by thermal expansion and contraction. It is especially suitable for floor expansion when heated (the floor is equipped with underfloor heating) and can effectively alleviate the deformation caused by the compression of the substrate 2.

[0063] Example 2

[0064] The floor in this embodiment is as follows: Figure 6-9 As shown, it is basically the same as Example 1, except that,

[0065] A plurality of connecting members 21 are provided along the length direction of the edge of the substrate 2, and the connecting members 21 are continuously distributed along the length direction of the edge of the substrate 2. When the connecting members 21 are continuously distributed along the length direction of the edge of the substrate 2, the protrusions and recesses 23 of two adjacent connecting members 21 are continuously and evenly distributed.

[0066] like Figures 8-9 As shown, the protrusion 22 is composed of curved surfaces and straight lines. It includes a first straight line segment A222 perpendicular to the bonding surface a and a second straight line segment A224 parallel to the bonding surface a. The two ends of the second straight line segment A224 are connected by an arc segment A223 to form the protrusion 22 with the bonding surface a. The recess 23 has a second arc surface 231 that mates with the protrusion 22, so that the protrusion 22 of the substrate 2 can mate with the recess 23 of the adjacent substrate 2.

[0067] To achieve the fit with the first straight segment A222 of the protrusion 22, the recess 23 may also be provided with a straight segment perpendicular to the mating surface a, and the two ends of the second arc surface 231 are respectively connected to the straight segment.

[0068] When two adjacent floorboards are bonded together, the cover 1 and the spacer 3 are bonded together, and the protrusion 22 of the substrate 2 is close to the recess 23 of the adjacent substrate 2. Specifically, the second straight segment A224 of the protrusion 22 and the second arc surface 231 of the recess 23 are close to each other. Since the two are not completely identical in shape, they cannot be completely bonded together. However, surprisingly, this mating structure can not only effectively alleviate the deformation of the floorboards caused by thermal expansion and contraction based on the gap b, but also has higher structural stability. The installed floorboards are not prone to sliding against each other. The reason for this is presumably because the first straight segment A222 of the protrusion 22 blocks the substrate 2 in the direction perpendicular to the bonding surface a, preventing it from sliding along the inclined surface; the straight segment of the recess 23 that is perpendicular to the bonding surface a is bonded to the first straight segment A222, further preventing the floorboards from sliding against each other.

[0069] Example 3

[0070] This embodiment is basically the same as embodiment 2, except that the recessed portion 23 is composed of curved surfaces and straight lines. It includes a first straight line segment B perpendicular to the bonding surface a and a second straight line segment B parallel to the bonding surface a. The two ends of the second straight line segment B are connected by arc segments B to form a recessed portion 23 with the bonding surface a. The protruding portion 22 has a first arc surface 221 that cooperates with the recessed portion 23, so that the protruding portion 22 of the substrate 2 can cooperate with the recessed portion 23 of the adjacent substrate 2.

[0071] Example 4

[0072] This embodiment is basically the same as embodiment 1, except that the protrusion 22 and the recess 23 are composed of straight lines. In this embodiment, a trapezoid is formed, wherein the part of the bottom of the trapezoid near the mating surface a is the widest part of the connecting member 21, and the width of the connecting member 21 gradually decreases along the mating surface a outward.

[0073] Example 5

[0074] This embodiment is basically the same as embodiment 1, except that the protrusions 22 and the recesses 23 are distributed at intervals along the length and / or width of the edge of the substrate 2.

[0075] Example 6

[0076] This embodiment is basically the same as embodiment 1, except that the connecting parts 21 are spaced apart on the edge of the substrate 2 along the length direction and / or the width direction.

[0077] The above description is only a preferred embodiment of this application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in this application is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, technical solutions formed by replacing the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0078] Apart from the technical features described in the specification, the other technical features are known to those skilled in the art. To highlight the innovative features of this utility model, the other technical features will not be described in detail here.

Claims

1. A flooring, comprising a substrate (2), characterized in that, The substrate (2) has a plurality of connecting parts (21) along its length and / or width directions. The connecting parts (21) include protrusions (22) and recesses (23). The protrusion (22) protrudes outward along the mating surface (a), and the protrusion (22) has a protruding surface with a uniform or non-uniform radius of curvature along the mating surface (a); and / or, The recessed portion (23) is recessed inward along the mating surface (a), and the recessed portion (23) has a recessed surface with a consistent or inconsistent radius of curvature inward along the mating surface (a); This allows the protrusion (22) of the substrate (2) to engage with the recess (23) of the adjacent substrate (2).

2. The flooring according to claim 1, characterized in that, The protrusion (22) and the recess (23) are connected.

3. The flooring according to claim 1, characterized in that, The protrusion (22) is composed of straight lines and / or arcs; and / or, the recess (23) is composed of straight lines and / or arcs.

4. The flooring according to claim 1, characterized in that, The vertical distance between the top of the protrusion (22) and the mating surface (a) is less than the vertical distance between the top of the recess (23) and the mating surface (a).

5. The flooring according to any one of claims 1-4, characterized in that, The connecting components (21) are continuously distributed along the length and / or width of the edge of the substrate (2).

6. The flooring according to any one of claims 1-4, characterized in that, The connecting components (21) are spaced apart along the length and / or width of the edge of the substrate (2).

7. The flooring according to claim 3, characterized in that, The protrusion (22) is composed of curved surfaces and straight lines. It includes a first straight line segment perpendicular to the mating surface (a) and a second straight line segment parallel to the mating surface. The two ends of the second straight line segment are connected by arc segments to form the protrusion (22) with the mating surface (a).

8. The flooring according to claim 3, characterized in that, The protrusion (22) has a first arc surface (221).

9. The flooring according to claim 8, characterized in that, The recessed portion (23) has a second arc surface (231) that mates with the protrusion (22), so that the protrusion (22) of the substrate (2) can mate with the recessed portion (23) of the adjacent substrate (2).

10. The flooring according to claim 9, characterized in that, The recessed portion (23) is also provided with a straight line segment perpendicular to the mating surface (a), and the two ends of the second arc surface (231) are respectively connected to the straight line segment.

11. The flooring according to claim 10, characterized in that, The first arc surface (221) and the second arc surface (231) are tangent to each other.

12. The flooring according to claim 11, characterized in that, The mating surface (a) passes through the center of the first arc surface (221) and the second arc surface (231).

13. The flooring according to claim 12, characterized in that, The radius of curvature R1 of the first arc surface (221) is less than the radius of curvature R2 of the second arc surface (231).

14. The flooring according to claim 13, characterized in that, The difference between the radius of curvature R1 of the first arc surface (221) and the radius of curvature R2 of the second arc surface (231) is 0.5~1.5mm.

15. The flooring according to claim 13, characterized in that, The central angle θ1 of the first arc surface (221) is smaller than the central angle θ2 of the second arc surface (231).

16. The flooring according to claim 15, characterized in that, The vertical distance between the top of the first arc surface (221) and the mating surface (a) is 6 mm, and the vertical distance between the top of the second arc surface (231) and the mating surface (a) is 7 mm.

17. The flooring according to claim 1, characterized in that, The floor also includes a cover (1) and a spacer (3), the edges of the cover (1) and the spacer (3) forming a mating surface (a), the protrusion (22) protruding outward along the mating surface (a), and the recess (23) recessing inward along the mating surface (a).

18. A flooring comprising a cover (1), a substrate (2), and a spacer (3), wherein the cover (1) is disposed on one side of the substrate (2), and the spacer (3) is disposed on the other side, and the edges of the cover (1) and the spacer (3) form a mating surface (a), characterized in that, The substrate (2) has continuously distributed protrusions (22) and recesses (23) along its length and width directions. The protrusions (22) protrude outward along the bonding surface (a), and the recesses (23) are recessed inward along the bonding surface (a). The protrusions (22) are composed of curved surfaces and straight lines. They include a first straight line segment perpendicular to the bonding surface (a) and a second straight line segment parallel to the bonding surface (a). The two ends of the second straight line segment are connected by arc segments to form a protrusion (22) with the bonding surface (a). The recesses (23) have a second arc surface (231) that mates with the protrusions (22), so that the protrusions (22) of the substrate (2) can mate with the recesses (23) of the adjacent substrate (2).

19. A composite flooring, characterized in that, The flooring includes any one of claims 1-18, wherein the flooring is bonded to each other, wherein adjacent protrusions (22) and recesses (23) are bonded / close to each other.

20. The composite flooring according to claim 19, characterized in that, A gap (b) is formed between adjacent protrusions (22) and recesses (23).

21. The composite flooring according to claim 20, characterized in that, The gap (b) between adjacent protrusions (22) and recesses (23) is 0.5~1.5mm.

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