A fly construction for trousers

Abstract

The utility model discloses a kind of splicing seam structures of trousers front, including left trouser piece, right trouser piece, face collar, lining and zipper;The left tape of zipper is sewn on face collar by first sewing machine, and the side edge of face collar is sewn and opposite fold by second sewing machine with left trouser piece, so that the face collar is located the back of the left trouser piece, and the other side edge of face collar is sewn with left trouser piece by third sewing machine;Lining includes first fabric and second fabric, and the side edge of first fabric and the side edge of second fabric are spliced to form double-layer lining structure, and make that seam portion is located in double-layer lining structure;Right trouser piece is folded to form first folded edge towards back, and right trouser piece, first folded edge, right tape of zipper and lining are sewn by fourth sewing machine, and the selvedge of first folded edge is locked by fifth sewing machine. Using the splicing seam structure of trousers front of the present application, the problem of over-thick stop port caused by directly superimposing right trouser piece, lining and zipper tape after edge treatment in traditional stop port processing process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of garment processing technology, and in particular to a stitching structure for trouser plackets. Background Technology

[0002] The fly is a key functional and decorative structure at the waist opening of the front panel of trousers. Its core function is to allow for easy on and off-the-leg adjustment and waist closure, while directly affecting the comfort, appearance, and durability of the trousers. In trouser manufacturing, the seam finishing of the fly is one of the core processes, and the quality of the seam finishing directly determines the user experience and product quality.

[0003] For zippered trousers, traditional binding techniques have unavoidable structural defects, especially on the inner placket side. As a key area that directly contacts the skin of the abdomen and hips, the raw edges of the trouser fabric, inner placket, and zipper tape are treated with binding, which directly causes abnormal accumulation of edge thickness, leading to significant wearing pain.

[0004] Therefore, existing technologies still need to be improved and enhanced. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a stitching structure for trouser fly, which aims to solve the problem of poor stitching effect of existing trouser fly stitching structures.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A trouser fly seam structure includes: a left trouser piece, a right trouser piece, a front placket, a lining placket, and a zipper; the left side of the zipper is sewn to the front placket via a first seam; one side of the front placket is sewn to the left trouser piece via a second seam and folded over so that the front placket is located on the back of the left trouser piece; the other side of the front placket is sewn to the left trouser piece via a third seam to position the front placket on the back of the left trouser piece; the lining placket includes a first fabric and a second fabric, the side edges of the first fabric and the second fabric are sewn together to form a double-layer lining placket structure, and the seam allowance is located within the double-layer lining placket structure; the right trouser piece is folded towards the back to form a first folded edge; the right trouser piece, the first folded edge, the right side of the zipper, and the lining placket are sewn together via a fourth seam; the raw edge of the first folded edge is overlocked via a fifth seam.

[0007] One side of the first fabric and one side of the second fabric are sewn together by a sixth seam and folded over each other; the other side of the first fabric is folded over towards the front of the inner placket to form a second folded edge, and the second folded edge is sewn separately from the other side of the second fabric by a seventh seam; the right trouser piece, the first folded edge, the right zipper strap, the second folded edge, the seam allowance of the second folded edge, and the first fabric are sewn together by a fourth seam.

[0008] The seam allowance formed by sewing one side of the first fabric and one side of the second fabric together with the sixth seam and folding them over is the first seam allowance. The first seam allowance is sewn to the first fabric with the eighth seam allowance.

[0009] The first fabric is a lining, and the second fabric is the same as the fabric of the right trouser panel. The other side of the first fabric is folded along the fold line toward the front of the inner placket to form a second folded edge, and the right edge of the zipper tape is located between the seventh seam and the fold line; the raw edge of the first folded edge is flush with the fold line.

[0010] The second seam allowance is formed by sewing one side of the front panel to the left trouser piece with a second seam and folding them together. The second seam allowance is located between the front panel and the left trouser piece. The front panel and the second seam allowance are sewn together with a ninth seam.

[0011] The other side of the front panel is provided with a binding strip to cover the raw edge, and the binding strip is sewn to the front panel by a tenth seam.

[0012] When the zipper is closed and the placket covers the front of the right trouser panel, the fourth seam is located between the third seam and the ninth seam, and the distance between the fourth seam and the ninth seam is 0.4-0.8cm.

[0013] Compared to existing technologies, this utility model provides a trouser placket stitching structure, including: a left trouser piece, a right trouser piece, a front placket, a back placket, and a zipper; the left side of the zipper is sewn to the front placket via a first seam, one side of the front placket is sewn to the left trouser piece via a second seam and folded over so that the front placket is located on the back of the left trouser piece, and the other side of the front placket is sewn to the left trouser piece via a third seam to position the front placket on the back of the left trouser piece; the back placket includes a first fabric and a second fabric, the side of the first fabric and the side of the second fabric are sewn together to form a double-layer back placket structure, and the seam allowance is located within the double-layer back placket structure; the right trouser piece is folded over to the back to form a first folded edge, the right trouser piece, the first folded edge, the right side of the zipper, and the back placket are sewn together via a fourth seam, and the raw edge of the first folded edge is overlocked via a fifth seam.

[0014] In this application, the lining uses a double-layer structure formed by splicing a first fabric and a second fabric, and the seam allowance is hidden between the two layers of fabric. This avoids the problem of excessively thick lining caused by directly stacking the right trouser piece, lining, and zipper tape and then binding the edges in traditional lining finishing processes. At the same time, the right trouser piece forms a first folded edge by folding it over. The raw edge of the first folded edge is locked with the fifth seam without adding extra lining thickness, making the overall thickness of the lining side that is in contact with the skin uniform and flat. This effectively improves the comfort of the lining against the abdomen and hips when wearing the garment, and avoids the problem of thick lining rubbing against the skin or causing a foreign body sensation. Attached Figure Description

[0015] Figure 1 A schematic diagram of the seam structure of the trouser fly provided by this utility model.

[0016] Figure 2 A schematic diagram of the sewing structure of the right trouser piece, the right zipper band, and the inner placket in the trouser fly seam structure provided by this utility model.

[0017] Figure 3 A schematic diagram of the stitching structure of the left trouser piece, the left zipper band, and the front placket in the trouser fly seam structure provided by this utility model.

[0018] Attached icon number Left trouser piece 1, front placket 11, second seam allowance 12, right trouser piece 2, inner placket 21, first fabric 22, second fabric 23, first folded edge 24, second folded edge 25, first seam allowance 26, fold line 27, zipper 3, left sizing tape 31, right sizing tape 32, first seam 41, second seam 42, third seam 43, fourth seam 44, fifth seam 45, sixth seam 46, seventh seam 47, eighth seam 48, ninth seam 49, binding strip 50, tenth seam 51. Detailed Implementation

[0019] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0020] It should be noted that when a component is referred to as being "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0021] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this utility model are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0022] The fly is a key functional and decorative structure at the waist opening of the front panel of trousers. Its core function is to allow for easy on and off-the-leg adjustment and waist closure, while directly affecting the comfort, appearance, and durability of the trousers. In trouser manufacturing, the seam finishing of the fly is one of the core processes, and the quality of the seam finishing directly determines the user experience and product quality.

[0023] For zippered trousers, traditional binding techniques have unavoidable structural defects, especially on the inner placket side. As a key area that directly contacts the skin of the abdomen and hips, the raw edges of the trouser fabric, inner placket, and zipper tape are treated with binding, which directly causes abnormal accumulation of edge thickness, leading to significant wearing pain.

[0024] Specifically, the lining typically consists of a base fabric layer and a facing layer. The base fabric layer is directly cut from the main fabric of the trousers and forms the outer layer of the lining, ensuring visual uniformity. The facing layer is located inside the base fabric layer and is made of the same fabric as the main fabric of the trousers or a thinner lining. When sewing the lining to trousers with a zipper, the raw edges of the main fabric of the trousers are folded inwards and then bound with the zipper tape and the lining using binding tape. To prevent the raw edges of the binding tape from being exposed, the raw edges of the binding tape are folded inwards towards the covering structure, creating a multi-layered structure at the seam. In addition, the thickness of the zipper teeth and the pressing effect of the binding stitch further enhance the stiffness of the lining, creating a noticeable, thick protrusion that is very noticeable upon contact with the body.

[0025] This utility model provides a stitching structure for a trouser fly; please refer to [link / reference]. Figures 1-3The zipper includes: a left trouser piece 1, a right trouser piece 2, a front placket 11, a back placket 21, and a zipper 3. The left webbing 31 of the zipper 3 is sewn to the front placket 11 via a first seam 41. One side of the front placket 11 is sewn to the left trouser piece 1 via a second seam 42 and folded over so that the front placket 11 is located on the back of the left trouser piece 1. The other side of the front placket 11 is sewn to the left trouser piece 1 via a third seam 43 to position the front placket 1 on the back of the left trouser piece 1. The lining 21 includes a first fabric 22 and a second fabric 23. The side edges of the first fabric 22 and the second fabric 23 are sewn together to form a double-layer lining 21 structure, with the seam allowance located within the double-layer lining structure. The right trouser piece 2 is folded towards the back to form a first folded edge 24. The right trouser piece 2, the first folded edge 24, the right zipper tape 32, and the lining 21 are sewn together by a fourth seam 44. The raw edge of the first folded edge 24 is overlocked by a fifth seam 45.

[0026] In this application, the inner placket 21 is constructed by splicing the first fabric 22 and the second fabric 23 to form a double-layer structure, and the seam allowance is hidden between the two layers of fabric. This avoids the problem of excessively thick seams caused by directly stacking the right trouser piece 2, the inner placket 21 and the zipper 3 tape in the traditional seam treatment process and then binding the edges. At the same time, the right trouser piece 2 is folded to form the first folded edge 24. The raw edge of the first folded edge 24 is locked with the fifth seam 45 without adding extra seam thickness, so that the overall thickness of the inner placket 21 side that is in contact with the skin is uniform and flat, which effectively improves the comfort of the placket against the abdomen and hips when wearing it, and avoids the problem of thick seams rubbing against the skin or causing foreign body sensation.

[0027] Compared to the complex wrapping of raw edges in traditional binding techniques, this structure simplifies the edge treatment process and reduces production difficulty through folded overlock and concealed seam allowance design. Furthermore, the front placket 11 is secured to the left trouser piece 1 by a folded overlock stitch on one side and a positioning stitch on the other side, ensuring a firm connection and preventing displacement or curling during wear. The double-layered structure of the inner placket 21, combined with the fourth seam 44 for the integrated stitching of the right trouser piece 2, the first folded edge 24, and the right zipper strap 32, forms a stable multi-layered fabric structure that reduces stretching and deformation of the placket during trousers wearing and undressing and zipper 3 closure. Simultaneously, the overlocked first folded edge 24 effectively prevents raw edges from falling off and fraying, extending the overall lifespan of the placket and trousers. It should be noted that... Figure 2 and Figure 3 The square on the zipper 3 is used to illustrate the zipper teeth; the accompanying drawings of this application are only for illustration of the seam structure and do not limit the specific fabric size and proportion.

[0028] Furthermore, one side of the first fabric 22 and one side of the second fabric 23 are sewn together by a sixth seam 46 and folded over each other; the other side of the first fabric 22 is folded over towards the front of the inner placket 21 to form a second folded edge 25, and the second folded edge 25 is sewn separately from the other side of the second fabric 23 by a seventh seam 47; the right trouser piece 2, the first folded edge 24, the right zipper strap 32, the second folded edge 25, the seam allowance of the second folded edge 25 and the first fabric 22 are sewn together by a fourth seam 44.

[0029] In this embodiment, the first fabric 22 and the second fabric 23 are joined by sewing with the sixth seam 46 and by folding them together. Combined with the design of separating the second folded edge 25 from the other side of the second fabric 23 by the seventh seam 47, both sides of the inner placket 21 form a closed folded edge structure, avoiding the problem of exposed raw edges on the traditional inner placket 21. Simultaneously, the separate seam process avoids the problem of the second folded edge 25 having an excessively thick edge on one side after the seam allowance is turned to one side after being joined with the second fabric 23. The right trouser piece 2, the first folded edge 24, the right webbing 32 of the zipper 3, the second folded edge 25, the seam allowance of the second folded edge 25, and the first fabric 22 are integrated and sewn together by the fourth seam 44, strengthening the connection stability between the inner placket 21, the zipper 3, and the right trouser piece 2. The seam allowance of the second folded edge 25 is wrapped inside the sewing structure of the fourth seam 44. Combined with the concealed seam allowance design when the inner placket 21 is sewn together, the entire edge seam allowance of the inner placket 21 is not exposed, so that the front and back of the inner placket 21 remain flat and smooth. This avoids the problem that the right trouser piece 2, the first folded edge 24, the right size tape 32 of the zipper 3, and the edge of the inner placket 21 are too thick after the traditional edge binding process, which can easily cause discomfort when in contact with the human body.

[0030] Furthermore, the seam allowance formed by sewing one side of the first fabric 22 and one side of the second fabric 23 together with a sixth seam thread 46 and folding them together is the first seam allowance 26. The first seam allowance 26 is sewn to the first fabric 22 with an eighth seam thread 48. In this embodiment, the first seam allowance 26 is formed by sewing one side of the first fabric 22 and one side of the second fabric 23 together. The first seam allowance 26 is then sewn to the first fabric 22 with the eighth seam thread 48 to fix the first seam allowance 26, thereby preventing curling or displacement at the seam when pulled by external force.

[0031] Furthermore, the first fabric 22 is a lining, and the second fabric 23 is the same as the fabric of the right trouser piece 2.

[0032] In this embodiment, the first fabric 22 is a lining. The lining effectively prevents the inner placket 21 from becoming soft and deformed due to long-term wear and washing, ensuring that the placket area remains flat and crisp. It also provides a stable support base for the zipper 3, ensuring even force distribution when the zipper 3 is pulled, further reducing jamming and sticking issues. Compared to ordinary fabrics, the lining has stronger wrinkle resistance, reducing wrinkles on the side of the inner placket 21 that contacts the body, thus improving the user's comfort when wearing the trousers. Preferably, the lining is a thin lining with a weight of 40-80 grams per square meter. The choice of a thin lining provides support without increasing the bulkiness of the inner placket 21, and makes the seam formed by the right trouser piece 2, the first folded edge 24, the right webbing 32 of the zipper 3, and the inner placket 21 thinner, thereby further improving the comfort of the placket area in contact with the body. The second fabric 23 is the same as the right trouser piece 2, making the exposed part of the inner placket 21 completely consistent with the fabric texture, color, and feel of the right trouser piece 2. This avoids the visual disjointedness caused by splicing different fabrics, achieving a unified style between the placket area and the overall trousers. It is especially suitable for high-end trousers with solid colors and clear textures, enhancing the overall appearance and sophistication of the product. At the same time, the heat shrinkage rate and dyeing stability of the same fabric are consistent, which can avoid problems such as inconsistent deformation and color difference between the inner placket 21 and the right trouser piece 2 due to differences in fabric characteristics after washing, ensuring that the trousers maintain a good appearance even after long-term use.

[0033] Furthermore, the other side of the first fabric 22 is folded along the fold line 27 toward the front of the inner placket 21 to form a second folded edge 25, and the edge of the right zipper tape 32 is located between the seventh seam 47 and the fold line 27; the raw edge of the first folded edge 24 is flush with the fold line 27. It should be noted that... Figure 2 The seventh seam 47 is shown horizontally to better illustrate the position of the seam. In actual sewing, the seventh seam 47 follows the direction of the inner placket 21.

[0034] In this embodiment, the raw edge of the first folded edge 24 is flush with the fold line 27, so that the raw edge is completely covered by the inner placket 21, with no excess exposed part. Combined with the overlocking treatment of the fifth seam 45, the risk of raw edge fraying and unraveling is eliminated. At the same time, the edge of the right zipper tape 32 is located between the seventh seam 47 and the fold line 27 of the second folded edge 25, realizing the physical isolation between the zipper tape 3 and the human skin. This completely avoids the friction, stinging, and foreign body sensation caused by the overlocking edge and the edge of the zipper tape directly contacting the skin. The raw edge of the first folded edge 24 is flush with the folded edge. Combined with the cover of the zipper tape 3 by the inner placket 21, a smooth and flat contact surface is formed on the inside of the placket, without the protruding edge of the zipper tape 3 or overlocking marks. This ensures that the placket area fits tightly against the human body when the trousers are worn, avoiding the discomfort caused by the binding strip protruding from the surface of the inner placket 21 after the edge treatment using traditional binding technology.

[0035] Furthermore, the seam allowance formed by sewing one side of the front panel 11 to the left trouser piece 1 with the second seam 42 and folding them together is the second seam allowance 12. The second seam allowance 12 is located between the front panel 11 and the left trouser piece 1, and the front panel 11 and the second seam allowance 12 are sewn together with the ninth seam 49.

[0036] In this embodiment, the second seam allowance 12, formed by the folding and sewing of the front placket 11 and the left trouser piece 1, is concealed between them. This seam allowance 12, along with the ninth seam 49, secures the front placket 11 to the second seam allowance 12, preventing displacement, curling, and loosening issues caused by relying solely on a single seam for fixation. This design ensures a tighter fit between the front placket 11 and the left trouser piece 1, maintaining the stability of the front placket 11 even after prolonged wear, friction, washing, and pulling. This prevents wrinkles and bulges in the placket area, significantly improving the tensile strength and shape stability of the overall placket structure and extending the lifespan of the trousers. Furthermore, the stable fixation of the front placket 11 provides a more robust support base for the left zipper strap 31, resulting in more even force distribution during zipper 3 operation and reducing jamming and sticking issues.

[0037] Furthermore, a binding strip 50 is provided on the other side of the placket 11 to cover the raw edge. The binding strip 50 is sewn to the placket 11 by the tenth seam 51. In this embodiment, the other side of the placket 11 is covered by the binding strip and fixed by the tenth seam 51 to treat the raw edge of the placket 11, avoiding problems such as easy pilling and unraveling at the edge of the placket 11. Compared with simple overlocking, the full-coverage design of the binding strip completely hides the raw edge of the other side of the placket 11 inside the binding. Even with long-term wear and repeated washing, the integrity of the edge of the placket 11 can be maintained, significantly improving the durability of the placket 11 and even the entire placket, and extending the service life of the trousers. In addition, since the inner placket 21 separates the placket 11 from the human body when the zipper 3 is closed, the placket 11 will not come into contact with the human body, and the binding treatment will not cause discomfort to the human body.

[0038] Furthermore, when the zipper 3 is closed and the placket 11 covers the front of the right trouser piece 2, the fourth seam 44 is located between the third seam 43 and the ninth seam 49, and the distance between the fourth seam 44 and the ninth seam 49 is 0.4-0.8cm.

[0039] In this embodiment of the application, preferably, the distance between the fourth seam 44 and the ninth seam 49 is 0.6cm, which ensures that the front placket 11 can accurately and tightly cover the front area of ​​the right trouser piece 2 after the zipper 3 is closed. This avoids the problem of incomplete coverage and exposure of the zipper 3 or seams due to too small a distance, and also prevents the problem of inconvenience for the user to pull the zipper 3 due to too large a distance, which would cause the overlap area between the front placket 11 and the right trouser piece 2 to be too large.

[0040] In summary, the present invention provides a trouser placket stitching structure comprising: a left trouser piece, a right trouser piece, a front placket, a back placket, and a zipper; the left side of the zipper is sewn to the front placket via a first seam; one side of the front placket is sewn to the left trouser piece via a second seam and folded over so that the front placket is located on the back of the left trouser piece; the other side of the front placket is sewn to the left trouser piece via a third seam to position the front placket on the back of the left trouser piece; the back placket comprises a first fabric and a second fabric, the side of the first fabric and the side of the second fabric are sewn together to form a double-layer back placket structure, and the seam allowance is located within the double-layer back placket structure; the right trouser piece is folded over to the back to form a first folded edge; the right trouser piece, the first folded edge, the right side of the zipper, and the back placket are sewn together via a fourth seam; the raw edge of the first folded edge is overlocked via a fifth seam.

[0041] In this application, the lining uses a double-layer structure formed by splicing a first fabric and a second fabric, and the seam allowance is hidden between the two layers of fabric. This avoids the problem of excessively thick lining caused by directly stacking the right trouser piece, lining, and zipper tape and then binding the edges in traditional lining finishing processes. At the same time, the right trouser piece forms a first folded edge by folding it over. The raw edge of the first folded edge is locked with the fifth seam without adding extra lining thickness, making the overall thickness of the lining side that is in contact with the skin uniform and flat. This effectively improves the comfort of the lining against the abdomen and hips when wearing the garment, and avoids the problem of thick lining rubbing against the skin or causing a foreign body sensation.

[0042] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. A stitching structure for a trouser fly, characterized in that, include: Left trouser piece (1), right trouser piece (2), front placket (11), inner placket (21), and zipper (3); the left band (31) of the zipper (3) is sewn onto the front placket (11) by a first seam (41), one side of the front placket (11) is sewn onto the left trouser piece (1) by a second seam (42) and folded over so that the front placket (11) is located on the back of the left trouser piece (1), and the other side of the front placket (11) is sewn onto the left trouser piece (1) by a third seam (43) so that the front placket (11) is positioned on the back of the left trouser piece (1); The inner placket (21) includes a first fabric (22) and a second fabric (23). The side of the first fabric (22) and the side of the second fabric (23) are sewn together to form a double-layer inner placket (21) structure, and the seam allowance is located within the double-layer inner placket structure. The right trouser piece (2) is folded towards the back to form a first folded edge (24). The right trouser piece (2), the first folded edge (24), the right code strip (32) of the zipper (3) and the inner placket (21) are sewn together by a fourth seam (44). The raw edge of the first folded edge (24) is overlocked by a fifth seam (45).

2. The seam structure of the trouser fly according to claim 1, characterized in that, One side of the first fabric (22) and one side of the second fabric (23) are sewn together by the sixth seam (46) and folded together; the other side of the first fabric (22) is folded toward the front of the inner placket (21) to form a second folded edge (25), and the second folded edge (25) and the other side of the second fabric (23) are sewn together by the seventh seam (47); the right trouser piece (2), the first folded edge (24), the right zipper tape (32), the second folded edge (25), the seam allowance of the second folded edge (25) and the first fabric (22) are sewn together by the fourth seam (44).

3. The seam structure of the trouser fly according to claim 2, characterized in that, The seam formed by sewing one side of the first fabric (22) and one side of the second fabric (23) together with the sixth seam (46) and folding them together is the first seam (26). The first seam (26) and the first fabric (22) are sewn together with the eighth seam (48).

4. The seam structure of the trouser fly according to claim 2, characterized in that, The first fabric (22) is a lining, and the second fabric (23) is the same as the fabric of the right trouser piece (2).

5. The seam structure of the trouser fly according to claim 4, characterized in that, The other side of the first fabric (22) is folded along the fold line (27) toward the front of the inner placket (21) to form a second folded edge (25), and the edge of the right code tape (32) of the zipper (3) is located between the seventh seam (47) and the fold line (27); the raw edge of the first folded edge (24) is flush with the fold line (27).

6. The seam structure of the trouser fly according to claim 2, characterized in that, The seam allowance formed by sewing one side of the front panel (11) and the left trouser piece (1) together with the second seam allowance (42) and folding them together is called the second seam allowance (12). The second seam allowance (12) is located between the front panel (11) and the left trouser piece (1). The front panel (11) and the second seam allowance (12) are sewn together with the ninth seam allowance (49).

7. The seam structure of the trouser fly according to claim 6, characterized in that, The other side of the front panel (11) is provided with a binding strip (50) to cover the raw edge, and the binding strip (50) and the front panel (11) are sewn together by the tenth seam line (51).

8. The seam structure of the trouser fly according to claim 6, characterized in that, When the zipper (3) is closed and the front placket (11) covers the front of the right trouser piece (2), the fourth seam (44) is located between the third seam (43) and the ninth seam (49), and the distance between the fourth seam (44) and the ninth seam (49) is 0.4-0.8cm.

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