CN109722795B

CN109722795B - Bed sheet sewing method

Info

Publication number: CN109722795B
Application number: CN201811551119.2A
Authority: CN
Inventors: 林宣疆; 王继周
Original assignee: Ningbo Fengge Household Products Co ltd
Current assignee: Ningbo Fengge Household Products Co ltd
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2021-05-07
Anticipated expiration: 2038-12-18
Also published as: CN109722795A

Abstract

The invention discloses a method for sewing a bed sheet, which comprises the steps of 1, preparing a bed surface, a lower hem and surrounding cloth; step 2, preparing a rope rolling device; step 3, sewing the bed surface and the rolling rope; and 4, sewing the lower hem and the enclosing cloth with the rolling rope simultaneously, increasing a shaping effect of the rolling rope after sewing the bed sheet to reduce the wrinkles of the bed surface, sewing the bed surface with the rolling rope, sewing the lower hem with the enclosing cloth and the rolling rope to realize sewing of the bed surface, the lower hem and the enclosing cloth, sewing the bed surface, the lower hem, the enclosing cloth and the rolling rope for the first time to realize secondary sewing connection of the bed surface, the lower hem and the enclosing cloth, and improving the sewing strength.

Description

Bed sheet sewing method

Technical Field

The invention relates to the technical field of bedding, in particular to a method for sewing a bed sheet.

Background

The bed sheet is one of textiles used on beds, and is also called a sheet. Most of the existing bed sheets are integrated, the existing bed sheets are directly paved on a mattress during use, people have higher requirements on the appearance of the bed sheets along with the improvement of life quality, various types of bed sheets appear in the market, for example, bed skirts appearing in the market comprise a bed surface and a lower hem, the bed surface and the lower hem are sewn by a sewing machine, the sewing method is easy to increase the gap of the joint of the bed surface and the lower hem due to the fact that the seam is easily off at the sewing line, and the strength after sewing is lower.

Disclosure of Invention

The invention aims to provide a method for sewing a bed sheet with high sewing strength.

The above object of the present invention is achieved by the following technical solutions:

the sewing method of the bed sheet is characterized in that the bed sheet comprises a bed surface, a lower hem and a piece of surrounding cloth, and the sewing of the bed sheet, the lower hem and the surrounding cloth comprises the following steps:

step 1, preparing a bed surface, a lower hem and surrounding cloth, and cutting the bed surface, the lower hem and the surrounding cloth according to the design size;

step 2, preparing a rolling rope, wherein the rolling rope comprises connecting cloth and a cotton rope;

step 3, sewing the bed surface and the rolling rope, firstly placing the cotton rope on the connecting cloth, turning over one side of the connecting cloth to wrap the cotton rope, and forming a channel for accommodating the cotton rope in the turned-over connecting cloth; attaching one side of the bed surface to the outer surface of one side of the connecting cloth, sewing the bed surface and the connecting cloth, and forming a first suture line at the sewing position, wherein the rolling rope is enclosed at the outer edge of the bed surface;

and 4, sewing the lower hem and the enclosing cloth with the rolling rope simultaneously, aligning the side edge of the lower hem with the side edge of the enclosing cloth, attaching the side edge parts of the lower hem and the enclosing cloth to the outer surface of the other side of the connecting cloth simultaneously after aligning, sewing the lower hem and the enclosing cloth simultaneously with the connecting cloth to form a second sewing line at the sewing position, and enabling the second sewing line to sequentially penetrate through the lower hem, the enclosing cloth, the connecting cloth and the bed surface.

By adopting the technical scheme, the rolling rope is additionally arranged between the bed surface and the lower hem and comprises the connecting cloth, one side of the connecting cloth is turned over and attached to the other side, one side of the bed surface is attached to one side surface of the connecting cloth firstly, two layers of the bed surface and the connecting cloth are sewn after sewing, and a first sewing line is left, namely the first sewing line penetrates through the three layers of cloth, the sewing has certain thickness, the sewing strength of the bed surface is preliminarily improved, and it can be imagined that if the thickness to be sewn is thinner, the two sewing surfaces can be easily subjected to the thread-off condition only by slightly pulling the force-applying sewing line to loose due to low attaching degree with the sewing surfaces; secondly, the lower hem and the surrounding cloth are aligned with the other side face of the connecting cloth for sewing, so that a second sewing line after sewing sequentially penetrates through the lower hem, the surrounding cloth, the connecting cloth and the bed surface, namely 5 layers of cloth, 4 layers of the lower hem, the surrounding cloth and the connecting cloth realize the strength after sewing among the lower hem, the surrounding cloth and the connecting cloth, the second sewing line sews the connecting cloth and the bed surface again to realize secondary sewing, the strength after sewing of the bed surface and the connecting cloth is improved, and meanwhile, the lower hem and the surrounding cloth are also sewed with the bed surface for one time, so that the sewing strength among the lower hem, the surrounding cloth and the bed surface is better enhanced; in addition, it still includes the cotton rope to roll the rope, the cotton rope is wrapped up in connecting the cloth, mainly play the design effect, sew up the back bed surface, the fold can be reduced with enclosing especially the bed surface under the design effect of cotton rope behind the cloth ability to the lower hem, the cotton rope rises and tightly connects whole cloth simultaneously, the bed surface can closely laminate in the surface department of connecting the cloth with the lower hem rear surface of sewing up, what reduce to connect cloth corner rocks makes the not hard up of first stylolite and second stylolite, better promotion has sewed up the stability after.

The invention is further configured to: when the bed surface is sewn with the connecting cloth in the step 3, one side of the bed surface is aligned with one side of the connecting cloth, and the bed surface is turned over along the first suture line after sewing and shields the first suture line; and 4, when the hem and the enclosing cloth are synchronously sewn with the connecting cloth in the step 4, aligning one side of the hem and one side of the enclosing cloth and then aligning the other side of the connecting cloth, turning over the hem and the enclosing cloth along a second sewing line and shielding the second sewing line after sewing, and arranging the enclosing cloth on the inner side surface of the hem.

Through adopting above-mentioned technical scheme, bed surface, lower hem and enclose cloth when sewing up with connecting cloth, align a side of bed surface, lower hem and enclosing cloth with the side of connecting cloth respectively, and the back bed surface of sewing up and lower hem and enclose cloth turn over to turn over and just cover first stylolite and second stylolite, have avoided first stylolite to expose with the second stylolite like this for the condition that outside article accident colluded two stylolite and lead to broken string or pine appears.

The invention is further configured to: in the step 3, the rolling rope further comprises a shaping piece and the shaping pieces are connected end to end, each shaping piece comprises a plurality of shaping blocks which are connected in series, every two adjacent shaping blocks are hinged to each other, each shaping block is provided with an arc-shaped groove with an opening at one side, the arc-shaped grooves are communicated with each other to form an arc-shaped channel, the cotton rope is clamped in the arc-shaped channel, one side of the opening of each shaping piece is attached to the connecting cloth, and the opening is covered after the cotton rope is wrapped by the connecting cloth.

By adopting the technical scheme, the cotton rope is limited in the shaping piece, the shaping piece is wrapped in the connecting cloth, and the shaping piece has certain rigidity, so that the shaping effect of the sewed bed sheet is improved by utilizing the shaping piece, and particularly, the bed surface and the connecting cloth have better leveling and shaping effects after being sewed, and the problem of wrinkling of the bed surface is effectively solved; secondly, the shaping piece comprises a plurality of shaping blocks which are hinged with each other, so that the whole shaping piece can be bent, the cotton rope is clamped in the shaping piece as a flexible piece to play a role in flexible support during bending, and the rigidity of the outer surface of the shaping piece is combined with the flexibility of the cotton rope, so that a better effect on shaping and crease resistance of the bed sheet is comprehensively achieved; and when the bed surface is attached to the lower hem, the enclosing and connecting cloth, the whole bed sheet has better shaping effect because the shaping piece is a rigid cotton rope with the inner part penetrating and winding property is not easy to be extruded and deformed.

The invention is further configured to: one side of the shaping block is provided with a first hinged seat, the other side of the shaping block is provided with a second hinged seat, the upper end face and the lower end face of the first hinged seat are provided with hinged grooves, the second hinged seat is provided with an open slot for inserting the first hinged seat, and the upper inner wall and the lower inner wall of the open slot are provided with hinged columns which can be clamped into the hinged grooves.

Through adopting above-mentioned technical scheme, two adjacent design pieces utilize the articulated seat of first articulated seat and the articulated seat of second to be connected and realize relative rotation, and this kind of structure is comparatively simple.

The invention is further configured to: the outer wall of the shaping block is an arc-shaped surface.

By adopting the technical scheme, the outer surface of the connecting cloth is also arc-shaped after the fixed piece is wrapped by the arc-shaped surface of the fixed block, so that the touch feeling is improved; secondly, the connection cloth can not be too tight when wrapping up the design piece, for example when the outer wall of design piece has the edge, and when the connection cloth was tight with the design piece, the edge can produce local stress concentration to the connection cloth, takes place to break easily.

The invention is further configured to: in the step 3, before the bed surface, the lower hem and the enclosing cloth are sewn with the connecting cloth, the outer edges of the bed surface, the lower hem and the enclosing cloth are firstly locked by using a locking machine.

Through adopting above-mentioned technical scheme, bed surface, lower hem, the cloth of enclosing after the lockstitch can prevent that the end of a thread from scattering, play the effect of repairing.

The invention is further configured to: further comprising:

and 5, pulling a rubber band on the enclosing cloth, wrapping a piece of sewing cloth on the lower edge of the enclosing cloth, forming a cavity between the two sides of the sewing cloth and the enclosing cloth, and then sewing the two sides of the sewing cloth and the enclosing cloth by penetrating a rubber band in any cavity.

And 6, edge locking of the finished product, namely, utilizing an edge locking machine to lock one side of the sewed bed surface, the enclosing cloth and the connecting cloth.

By adopting the technical scheme, the size of the bed surface is matched with that of the mattress, so that the rolling ropes can be positioned at the edge of the mattress, the whole bed sheet is buckled on the mattress by utilizing the natural sagging of the lower hem, the movement of the bed sheet relative to the mattress is reduced, and the bed sheet is well positioned and shaped; the lower edge of the enclosing cloth is additionally provided with the rubber band, so that the whole lower edge has the tendency of inward folding, the mattress can be wrapped by the enclosing cloth, and the lower hem and the bed surface are connected with the enclosing cloth, so that the bed sheet and the mattress have better shaping and connecting effects; and finally, the bed surface, the lower hem, the surrounding cloth and the connecting cloth are subjected to primary overlocking to integrate the bed surface, the lower hem, the surrounding cloth and the connecting cloth into a whole, and the scattering of thread ends is avoided.

The invention is further configured to: a gap is reserved between the first suture line and the cotton rope, and the second suture line is arranged between the first suture line and the cotton rope.

By adopting the technical scheme, a gap reserved between the first suture line and the cotton rope provides a reserved suture space for providing the suture of the lower hem, the surrounding cloth and the connecting cloth; its time second stylolite will be closer to more than first stylolite and make to connect the cloth and turn over the back and form the passageway volume and reduce, improve the degree of holding tightly of connecting cloth to the cotton rope for whole connection cloth is more tight, improves the design effect.

The invention is further configured to: the first suture line and the second suture line are overlapped with each other.

Through adopting above-mentioned technical scheme, behind first stylolite and the coincidence of second stylolite, improved the seam intensity of sewing up the position.

The invention is further configured to: the distance between the first suture line and the edge of the bed surface is 1.0-2.0 cm, and the sewing needle distance between the first suture line and the second suture line is 1.5-2.5 cm.

Through adopting above-mentioned technical scheme, the interval that first stylolite was reserved with the bed surface is for guaranteeing better sewing connectivity, and the easy off-line of interval undersize is extravagant cloth too greatly, and the control of making up the gauge needle equally for better promotion sews up firm degree, and gauge needle undersize influences pleasing to the eye degree, reduces when too big and sews up firm degree.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the shaping effect of the sewn bed sheet is improved by adding a rolling rope, so that wrinkles on the bed surface are reduced, the bed surface is sewn with the rolling rope, the sewing of the bed surface, the lower hem and the surrounding cloth is realized after the lower hem is sewn with the surrounding cloth and the rolling rope, the bed surface, the lower hem, the surrounding cloth and the rolling rope are sewn for the first time, the secondary sewing connection of the bed surface, the lower hem and the surrounding cloth is realized, and the sewing strength is improved;

2. the fixing effect on the bed surface is improved by the clamping of the fixing piece and the cotton rope, and meanwhile, the toughness of the positioning piece is improved by the cotton rope, so that the shape change of the fixing piece is better facilitated;

3. bed surface, lower hem, enclose cloth and connect the mode of sewing up of cloth respectively for it shields first stylolite and second stylolite to sew up the back, avoids two stylolite to be colluded by outside article, and bed surface and lower hem and be connected cloth laminating are further shields two stylolite simultaneously, have reduced the stylolite accident and have colluded the condition of being broken, improve sutural stability.

Drawings

FIG. 1 is a schematic flow chart of a sheet sewing method;

FIG. 2 is a schematic view of a structure of a bed sheet;

FIG. 3 is a schematic cross-sectional view of the bed surface, the lower hem, the enclosure and the roller rope after being sewn;

FIG. 4 is a schematic view of the structure of the positioning member and the cotton string after the positioning member and the cotton string are engaged;

FIG. 5 is a schematic view of a positioning block;

FIG. 6 is a diagram showing the positional relationship between the first sewing thread and the second sewing thread on the connecting cloth when they are not overlapped;

FIG. 7 is a view showing the positional relationship between the first sewing thread and the second sewing thread on the connecting cloth when they are overlapped;

fig. 8 is a schematic cross-sectional view after rubber bands are stretched around the cloth.

In the figure, 10, the bed surface; 11. a first suture line; 20. a lower hem; 21. a second suture thread; 30. rope rolling; 31. a cotton rope; 32. connecting cloth; 33. shaping a profile; 331. a shaping block; 3311. an arc-shaped surface; 3312. an arc-shaped slot; 332. a first hinge mount; 3321. a hinge slot; 333. a second hinge mount; 3331. an open slot; 3332. a hinged column; 34. a channel; 40. enclosing cloth; 50. sewing the cloth; 51. a cavity; 60. a rubber band.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a method for sewing a sheet, a sewn sheet structure as shown in fig. 2 includes a split type bed surface 10, a hem 20 adjacent to the bed surface 10, a cloth 40 attached to an inner side surface of the hem 20, and a rolling rope 30 connecting the bed surface 10, the hem 20, and the cloth 40. The rolling rope 30 is enclosed around the bed surface 10, the shape and area of the bed surface 10 can be matched with the upper surface of the mattress to be laid, and the bed surface 10 can cover the whole mattress. Meanwhile, the bed surface 10 is woven by warps and wefts, wherein the warps are polyester yarns, and the wefts are regenerated fibers.

The specific sewing method comprises the following steps:

step 1, preparing bed surface, lower hem and surrounding cloth

According to the size of the mattress to be matched, the bed surface 10, the lower hem 20 and the enclosing cloth 40 are cut to meet the matching requirement. The edges of the cut bed surface 10, the lower hem 20 and the surrounding cloth 40 are all locked by using a locking machine.

Step 2, rope rolling preparation

Referring to fig. 3 and 4, the rolling rope 30 includes a connecting cloth 32, a cotton rope 31, and a shaping member 33, and the cotton rope 31 is first fastened to the shaping member 33 such that the shaping member 33 is connected to the cotton rope 31. Referring to fig. 5, the positioning member comprises a plurality of serially connected shaping blocks 331, each shaping block 331 has an arc-shaped slot 3312, a plurality of arc-shaped slots 3312 form an arc-shaped channel 34 after the plurality of shaping blocks 331 are serially connected, and the cotton rope 31 is clamped in the arc-shaped channel 34. The outer wall of the shaping block 331 is an arc-shaped surface 3311, two side surfaces of the shaping block 331 are respectively provided with a first hinge seat 332 and a second hinge seat 333, and two end surfaces of the first hinge seat 332 are provided with hinge grooves 3321; the second hinge base 333 is provided with an open slot 3331 through which the first hinge base 332 passes, two side walls of the open slot 3331 are provided with hinge columns 3332, the hinge columns 3332 can be clamped in the hinge slots 3321, and the two adjacent shaping blocks 331 rotate relative to each other with the axis of the hinge column 3332 as a rotation center.

The cotton string 31 is clamped on the fixed member 33 and placed on the connecting cloth 32, and the opening of the arc-shaped slot 3312 is ensured to face the connecting cloth 32, then one side of the connecting cloth 32 is turned over to align with the other side, the turned-over connecting cloth 32 forms a channel 34 for accommodating the fixed member 33, and the connecting cloth 32 wraps the fixed member 33 to close the opening of the arc-shaped slot 3312, as shown in fig. 3, and the preparation before sewing the rolling string 30 is completed.

Step 3, sewing the bed surface and the rolling rope

Referring to fig. 3 and 6, first, one side of the bed surface 10 is aligned with the side of the connecting cloth 32, the bed surface 10 and the two layers of connecting cloth 32 are sewn by using a sewing machine, and a first sewing line 11 is formed at the sewing position, wherein the distance H between the first sewing line 11 and the side of the bed surface 10 is 1.0-2.0 cm, preferably 1.5 cm. After the bed surface 10 is sewed, the bed surface is folded along the first sewing line 11 to form a plane, the head end and the tail end of the fixed part 33 are connected, and the bed surface 10 is flattened and tensioned.

Step 4, sewing the hem and the surrounding cloth with the rolling rope simultaneously

Firstly, the lower hem 20 is aligned with one side of the surrounding cloth 40, after the alignment, the lower hem 20 and the surrounding cloth 40 are attached to the other side of the connecting cloth 32 and are aligned with the side of the connecting cloth 32, then, the sewing is carried out by using a sewing machine, a second sewing thread 21 is formed after the sewing, and the second sewing thread 21 sequentially penetrates through the lower hem 20, the surrounding cloth 40, the connecting cloth 32 on the two sides and the bed surface 10. After the sewing of the hem 20 and the cloth 40 is completed, the hem 20 and the cloth 40 are folded along the second sewing line 21 and naturally hang down, and at this time, the hem 20 and the bed surface 10 are in a vertical state as shown in fig. 3.

Referring to fig. 6, a gap is formed between the first sewing thread 11 and the cotton rope 31, the gap is reserved for the sewing space of the skirt 20, the second sewing thread 21 is located between the first sewing thread 11 and the cotton rope 31, and the passage 34 is further narrowed, so that the connecting cloth 32 is more tightly held by the shaping member 33.

Meanwhile, the sewing stitch length L of the first sewing thread 11 and the second sewing thread 21 is controlled to be 1.5-2.5 cm, preferably 2.0cm in the sewing process.

Of course, referring to fig. 7, another suturing method is shown, in which the suture between the bed surface 10 and the connecting cloth 32 is closer to the cotton rope 31 side, so that the distance H between the first suture line 11 and the bed surface 10 reaches 2.0cm, when the hem 20 and the enclosing cloth 40 are sutured with the connecting cloth 32 at the same time, the first suturing position of the bed surface 10 is aligned, so that the second suture line 21 is overlapped with the first suture line 11 after suturing.

Step 5, cloth-surrounding rubber band

Referring to fig. 8, a sewing cloth 50 is used to wrap a part of the lower edge of the enclosing cloth 40, a cavity 51 is formed between the enclosing cloth 40 and the sewing cloth 50, a rubber band 60 penetrates through the cavity 51, the sewing cloth 50 and the enclosing cloth 40 are sewn to reserve the rubber band 60 in the cavity 51, and the lower edge of the enclosing cloth 40 has a tendency of being folded by the rubber band 60.

Step 6, the finished product is subjected to edge locking,

the bed surface 10, the two-side connecting cloth 32 and the enclosing cloth 40 are serged by a serging machine, so that the components are integrated.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The sewing method of the bed sheet is characterized in that the bed sheet comprises a bed surface (10), a hem (20) and a piece of surrounding cloth (40), and the sewing of the bed sheet, the hem and the surrounding cloth comprises the following steps:

step 1, preparing a bed surface, a lower hem and surrounding cloth, and cutting the bed surface (10), the lower hem (20) and the surrounding cloth (40) according to the design size;

step 2, preparing a rolling rope, wherein the rolling rope (30) comprises a connecting cloth (32) and a cotton rope (31);

step 3, sewing the bed surface and the rolling rope, firstly placing the cotton rope (31) on the connecting cloth (32), turning over one side of the connecting cloth (32) to wrap the cotton rope (31), and forming a channel (34) for accommodating the cotton rope (31) in the turned-over connecting cloth (32); attaching one side of the bed surface (10) to the outer surface of one side of the connecting cloth (32), sewing the bed surface (10) and the connecting cloth (32) to form a first suture line (11) at the sewing position, enclosing the rolling rope (30) at the outer edge of the bed surface (10), aligning one side of the bed surface (10) with one side of the connecting cloth (32) when the bed surface (10) and the connecting cloth (32) are sewn, and folding the bed surface (10) along the first suture line (11) and shielding the first suture line (11) after sewing;

step 4, simultaneously sewing the hem and the enclosing cloth with the rolling rope, aligning the side edge of the hem (20) with the side edge of the enclosing cloth (40), simultaneously attaching the side edge parts of the hem (20) and the enclosing cloth (40) to the outer surface of the other side of the connecting cloth (32) after aligning, then simultaneously sewing the hem (20) and the enclosing cloth (40) with the connecting cloth (32) to form a second sewing thread (21) at the sewing position, sequentially penetrating the second sewing thread (21) through the hem (20), the enclosing cloth (40), the connecting cloth (32) and the bed surface (10), aligning one side edges of the hem (20) and the enclosing cloth (40) with the connecting cloth (32) when the hem (20) and the enclosing cloth (40) are synchronously sewn with the connecting cloth (32), then aligning with the other side edge of the connecting cloth (32), simultaneously turning over the hem (20) and the enclosing cloth (40) along the second sewing thread (21) and shielding the second sewing thread (21), the surrounding cloth (40) is arranged on the inner side surface of the lower hem (20);

the rolling rope (30) further comprises a shaping piece (33), the shaping piece (33) is connected end to end, the shaping piece (33) comprises a plurality of serially connected shaping blocks (331), two adjacent shaping blocks (331) are hinged with each other, the shaping blocks (331) are provided with arc-shaped grooves (3312) with one sides opened, the arc-shaped grooves (3312) are communicated with each other to form an arc-shaped channel (34), the cotton rope (31) is clamped in the arc-shaped channel (34), then one sides of the openings of the shaping pieces (33) are attached to the connecting cloth (32), and the opening is covered after the cotton rope (31) is wrapped by the connecting cloth (32);

a first hinge seat (332) is arranged on one side of the shaping block (331), a second hinge seat (333) is arranged on the other side of the shaping block (331), hinge grooves (3321) are formed in the upper end face and the lower end face of the first hinge seat (332), an open groove (3331) for inserting the first hinge seat (332) is formed in the second hinge seat (333), and hinge columns (3332) which can be clamped into the hinge grooves (3321) are arranged on the upper inner wall and the lower inner wall of the open groove (3331);

the outer wall of the shaping block (331) is an arc-shaped surface (3311).

2. The method for sewing a bed sheet as claimed in claim 1, wherein in step 3, the outer edges of the bed sheet (10), the bottom sheet (20) and the cloth (40) are firstly stitched by a stitching machine before the bed sheet (10), the bottom sheet (20) and the cloth (40) are stitched with the connecting cloth (32).

3. The method for sewing a sheet according to claim 1, further comprising:

step 5, pulling rubber bands on the surrounding cloth, wrapping a piece of sewing cloth (50) at the lower edge of the surrounding cloth (40), forming a cavity (51) between the two sides of the sewing cloth (50) and the surrounding cloth (40), penetrating a rubber band (60) into any one cavity (51), and sewing the two sides of the sewing cloth (50) and the surrounding cloth (40);

and 6, performing edge locking on the finished product, namely performing edge locking on one side of the sewed bed surface (10), the surrounding cloth (40) and the connecting cloth (32) by using an edge locking machine.

4. Method for sewing a sheet according to claim 1, characterized in that a gap is left between the first stitch (11) and the cotton thread (31), the second stitch (21) being interposed between the first stitch (11) and the cotton thread (31).

5. Method for sewing a sheet according to claim 1, characterized in that said first sewing thread (11) and said second sewing thread (21) coincide with each other.

6. The method for sewing a sheet as claimed in claim 1, wherein the first sewing thread (11) is spaced from the edge of the sheet (10) by 1.0-2.0 cm, and the first sewing thread (11) and the second sewing thread (21) are sewn at a stitch pitch of 1.5-2.5 cm.