Efficient sewing method for hat wall lace

Abstract

The invention relates to the technical field of cap production and processing, in particular to an efficient sewing method for a cap wall lace. Comprising the following steps: adjusting the ironing temperature and the ironing pressure according to the material quality and the thickness of materials for manufacturing a hat wall and a lace, and ironing the hat wall and the lace; a special positioning mold is used, according to the shapes and sizes of the cap wall and the decorative strip, the decorative strip is positioned on the cap wall, and the position is fixed through a hot melt adhesive film or a temporary fixing line; selecting a sewing machine needle, a sewing thread and sewing parameters according to the materials, the thicknesses and the sewing requirements of the cap wall and the lace; starting the sewing machine, and sewing along the fixed edge of the lace and the cap wall according to the selected sewing machine needle, sewing thread and sewing parameters; and the hot melt adhesive film or the temporary fixing line is removed, and the sewn cap wall lace is shaped and ironed. The hat wall and the decorative strip are relatively fixed through the special mold and then sewn, so that the quality of the manufactured hat wall decorative strip product is stable.

Description

Technical Field

[0001] The invention relates to the technical field of hat production and processing, and in particular to a method for efficiently sewing hat wall decorative bands. Background Art

[0002] Sewing the bands of hats is a crucial step in the production of hats. Currently, traditional methods for sewing bands have numerous shortcomings. For one thing, manual labor is a significant factor, requiring workers to manually position and align the bands with the hat bands before sewing. This method not only consumes significant labor and time, resulting in low production efficiency, but also, due to variations in manual labor, it is difficult to ensure consistent and accurate sewing of the bands on every hat, leading to varying product quality. For example, in the production of the bands of women's peaked hats, the caps feature badges and pins. Under current technology, even the slightest inaccuracy can cause these badges and pins to skew. Furthermore, the bands are fabricated with a thick adhesive backing, while the lining is thin. This results in uneven lining between the bands and the hat bands, severely impacting the product's appearance and leading to a high rate of rework.

[0003] On the other hand, some existing sewing equipment and processes lack adaptability to the different materials and thicknesses of decorative bands and cap wall materials. For example, when the decorative band material is soft or thin, wrinkles and deformation are more likely to occur during the sewing process; when the decorative band material is hard or thick, sewing becomes more difficult, and needle breakage and uneven stitching are more likely to occur, affecting sewing quality and equipment life. In addition, when sewing the cap wall of the training cap, traditional processing requires manual and continuous feeding of several different sewing materials, which is difficult to maintain synchronous feeding. During the feeding process, twisting and wrinkling are easily caused, resulting in poor flatness of the sewn cap wall, affecting the aesthetics and overall quality of the training cap. Summary of the Invention

[0004] In order to overcome the defect of unstable product quality of the above-mentioned technology, the purpose of the present invention is to provide an efficient sewing method for cap wall decorative strips, which uses a special mold to relatively fix the cap wall and the decorative strips before sewing, so that the quality of the produced cap wall decorative strips is stable.

[0005] The present invention discloses a high-efficiency sewing method for a cap wall decorative tape, comprising the following steps:

[0006] Step S100: adjusting the ironing temperature and pressure according to the material and thickness of the cap wall and decorative band to iron the cap wall and decorative band;

[0007] Step S200: using a dedicated positioning mold and positioning the decorative band on the cap wall according to the shape and size of the cap wall and the decorative band, and fixing the position with a hot melt adhesive film or a temporary fixing line;

[0008] Step S300: selecting a sewing machine needle, sewing thread, and sewing parameters according to the material and thickness of the cap wall and decorative band and the sewing requirements;

[0009] Step S400: starting the sewing machine and sewing along the fixed edge of the decorative band and the cap wall using the selected sewing machine needle, sewing thread and sewing parameters;

[0010] Step S500: After the sewing is completed, the hot melt adhesive film or the temporary fixing thread is removed, and the sewn cap wall decoration band is shaped and ironed to obtain a qualified cap wall decoration band.

[0011] Preferably, in step S100, the process further includes performing a pre-shrinkage process on the decorative tape, wherein the pre-shrinkage rate of the pre-shrinkage process is calculated as follows: pre-shrinkage rate = (length before pre-shrinkage - length after pre-shrinkage) / length before pre-shrinkage × 100%;

[0012] The materials of the ribbons include cotton ribbons and blended ribbons; among them, the pre-shrinkage rate of the cotton ribbons is 3% to 5%, and the pre-shrinkage rate of the blended ribbons is 2% to 3%.

[0013] Preferably, the positioning mold adopts an adjustable structure so as to be adjusted according to the sizes of cap walls and decorative bands of different styles.

[0014] Preferably, in step S200, when the position is fixed by a hot melt adhesive film, the melting point of the hot melt adhesive film is selected according to the material of the cap wall and the decorative band. When the cap wall and the decorative band are made of cotton, the melting point of the hot melt adhesive film is 100° C. to 120° C.; when the cap wall is made of chemical fiber and the decorative band is a blended decorative band, the melting point of the hot melt adhesive film is 80° C. to 100° C.

[0015] When the position is fixed by hot-melt adhesive film, the hot-melt adhesive film is evenly laid on the bonding surface of the cap wall and the decorative strip, and a heating device with a heating temperature 10°C to 20°C higher than the melting point of the hot-melt adhesive film is used to heat the hot-melt adhesive film for 5s to 10s. After the hot-melt adhesive film cools, the cap wall and the decorative strip are fixed in position.

[0016] Preferably, during the sewing process in step S400 , the sewing trajectory of the decorative tape is projected onto the workbench of the sewing machine based on a laser-assisted positioning system.

[0017] Preferably, in step S500, it also includes quality inspection of the cap wall decorative tape after shaping and ironing, and the quality inspection includes appearance inspection and sewing strength inspection of the cap wall decorative tape; and the sewing strength inspection satisfies the sewing strength greater than 5N / cm, and the sewing strength = tension value / decoration tape width.

[0018] Preferably, in step S400, when sewing, at the turning or corner portion of the decorative tape, the sewing machine reduces the sewing speed by 30% to 50%, and adjusts the sewing stitch length in the sewing parameters by shortening the sewing stitch length by 20% to 30%, and increasing the stitch density by 20% to 40%.

[0019] After adopting the above technical solution, compared with the existing technology, the beneficial effect of the present invention is that the cap wall and the decorative band are relatively fixed by a special mold and then sewn, so that the quality of the produced cap wall and decorative band products is stable; at the same time, after the ironing process in step S100, the cap wall and the decorative band are made flat and crisp, which enhances the adaptability to sewing different materials and further improves the stability of the product during sewing; in step S300, the sewing machine needle, suture and the sewing parameters are accurately selected according to the material, thickness and sewing requirements of the cap wall and the decorative band, thereby further improving the quality stability of the sewing product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of the steps of a method for efficiently sewing a cap wall decorative tape. DETAILED DESCRIPTION

[0021] The advantages of the present invention are further described below with reference to the accompanying drawings and specific embodiments.

[0022] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0023] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0025] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0026] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0027] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention and have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0028] Example 1: Sewing of cotton cap wall and cotton decorative band, see Figure 1 shown.

[0029] Step S100: Cotton material is selected to make the cap wall and decorative band, and the thickness of the cap wall and decorative band is measured respectively. The measured thickness of the cap wall is 0.8mm, and the thickness of the decorative band is 0.5mm. The cap wall and decorative band are laid flat on the ironing table. According to the characteristics of the cotton material and the thickness of the cap wall and decorative band, the ironing temperature is set to 160°C and the ironing pressure is set to 0.4MPa. At the same time, the decorative band is pre-shrunk by soaking it in warm water at 30°C for 15 minutes, and then taken out and naturally dried. The length of the decorative band before pre-shrinkage is measured to be 50cm, and the length after pre-shrinkage is 48cm. According to the pre-shrinkage rate calculation formula, pre-shrinkage rate = (length before pre-shrinkage - length after pre-shrinkage) / length before pre-shrinkage × 100%, the pre-shrinkage rate is 4%, which is within the pre-shrinkage rate range of 3% to 5% for cotton decorative bands.

[0030] Step S200: Using a dedicated positioning mold, based on the shape and size of the cap wall and decorative band, if the cap wall is circular and the decorative band is annular and patterned, first adjust the arc of the circular positioning groove of the positioning mold to the circular contour of the cap wall. Then adjust the positioning groove width to 2cm and length to 30cm to accommodate the size of the annular decorative band. Place the decorative band into the positioning groove, ensuring that the annular pattern aligns with the preset position of the cap wall. Then, select a hot melt adhesive film with a melting point of 110°C and evenly apply it to the contact surface of the decorative band and cap wall. Heat the film at 120°C for 5 seconds to melt the hot melt adhesive film, securing the decorative band and cap wall.

[0031] Step S300: Given that the cap wall and decorative band are made of cotton, with a thickness of 0.8 mm for the cap wall and 0.5 mm for the decorative band, a size 11 sewing machine needle and fine cotton thread are used for sewing. The sewing machine is set to a speed of 1100 stitches per minute, a stitch length of 2.5 mm, and a stitch density of 10 stitches per centimeter. For the curve of the decorative band, the sewing speed is set to 700 stitches per minute, a stitch length of 2 mm, and a stitch density of 12 stitches per centimeter.

[0032] Step S400: Start the sewing machine and sew along the edge where the decorative tape and the cap wall are fixed according to the parameters set in step S300. At the same time, during the sewing process, turn on the laser-assisted positioning system. The operator adjusts the position in real time according to the laser trajectory and determines whether to sew the turns or corners until the sewing is completed.

[0033] Step S500: After sewing is completed, remove the hot melt adhesive film or temporary fixing line, and shape and iron the cap wall decorative tape. Then perform manual appearance inspection and test the sewing strength through a tensile testing machine. When the tensile value after testing by the tensile testing machine is 12N and the tape width is 2cm, the sewing strength = tensile value / tape width = 12 / 2 = 6N / cm. The sewing strength of 6N / cm is greater than the set 5N / cm, and the sewing cap wall decorative tape product quality is qualified.

[0034] Example 2: Chemical fiber cap wall and blended decorative band, see Figure 1 shown.

[0035] Step S100: Select a cap wall made of chemical fiber and a decorative band made of a blended material, and measure the thickness of each. The measured thickness of the cap wall is 0.6 mm, and the thickness of the decorative band is 0.3 mm. Lay the cap wall and decorative band flat on an ironing table. Based on the properties of the chemical fiber and blended materials, as well as the thickness of the cap wall and decorative band, set the ironing temperature to 130°C and the ironing pressure to 0.3 MPa. Simultaneously, pre-shrink the decorative band by soaking it in 40°C warm water for 12 minutes, then removing it and air-drying it. The measured length of the decorative band before pre-shrinkage is 40 cm, and the length after pre-shrinkage is 39 cm. According to the pre-shrinkage ratio calculation formula (pre-shrinkage ratio = (pre-shrinkage length - pre-shrinkage length) / pre-shrinkage length × 100%), the pre-shrinkage ratio is 2.5%, which is within the pre-shrinkage ratio range of 2% to 3% for blended decorative bands.

[0036] Step S200: Using a dedicated positioning mold, based on the shape and size of the cap wall and decorative band, if the cap wall is octagonal and the decorative band is irregularly wavy, the positioning mold is used. First, adjust the mold's positioning groove to fit the octagonal cap wall contour. Then, adjust the positioning groove width to 1.5cm and length to 25cm to accommodate the size of the decorative band. Place the decorative band into the positioning groove, ensuring that the wavy edge aligns with the preset position of the cap wall. Select a hot melt adhesive film with a melting point of 90°C and evenly apply it to the contact surface of the decorative band and cap wall. Heat the heating device at 100°C for 5 seconds to melt the hot melt adhesive film, securing the position of the decorative band and the cap wall.

[0037] Step S300: Considering the cap wall is made of synthetic fiber and the decorative band is made of a blended material, with a cap wall thickness of 0.6 mm and a decorative band thickness of 0.3 mm, a No. 9 sewing machine needle and fine silk thread are used for sewing. The sewing machine is set to a sewing speed of 1200 stitches per minute, a stitch length of 2 mm, and a stitch density of 12 stitches per centimeter. For the curve of the decorative band, the sewing speed is set to 600 stitches per minute, a stitch length of 1.6 mm, and a stitch density of 14 stitches per centimeter.

[0038] Step S400: Start the sewing machine and sew along the edge where the decorative tape and the cap wall are fixed according to the parameters set in step S300. At the same time, during the sewing process, turn on the laser-assisted positioning system. The operator adjusts the position in real time according to the laser trajectory and determines whether to sew the turns or corners until the sewing is completed.

[0039] Step S500: After sewing is completed, remove the hot melt adhesive film or temporary fixing line, and shape and iron the cap wall decorative tape. Then perform manual appearance inspection and test the sewing strength through a tensile testing machine. When the tensile value after testing by the tensile testing machine is 18N and the tape width is 3cm, the sewing strength = tensile value / tape width = 18 / 3 = 6N / cm. The sewing strength of 6N / cm is greater than the set 5N / cm, and the sewing cap wall decorative tape product quality is qualified.

[0040] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency sewing method for a cap wall decorative tape, characterized in that: The following steps are involved: Step S100: adjusting the ironing temperature and pressure according to the material and thickness of the cap wall and the decorative band to iron the cap wall and the decorative band; Step S200: using a dedicated positioning mold and positioning the decorative band on the cap wall according to the shapes and sizes of the cap wall and the decorative band, and fixing the position by a hot melt adhesive film or a temporary fixing line; Step S300: selecting a sewing machine needle, sewing thread, and sewing parameters according to the material and thickness of the cap wall and the decorative band and sewing requirements; Step S400: starting the sewing machine and sewing along the fixed edge of the decorative band and the cap wall using the selected sewing machine needle, sewing thread and sewing parameters; Step S500: After the sewing is completed, the hot melt adhesive film or the temporary fixing line is removed, and the sewn cap wall decorative band is shaped and ironed to obtain the qualified cap wall decorative band.

2. The efficient sewing method for cap wall decorative tape according to claim 1 is characterized in that: In the step S100, the decorative tape is further subjected to a pre-shrinkage treatment, wherein the pre-shrinkage rate of the pre-shrinkage treatment is calculated as follows: pre-shrinkage rate = (length before pre-shrinkage - length after pre-shrinkage) / length before pre-shrinkage × 100%; The materials of the decorative ribbon include cotton decorative ribbon and blended decorative ribbon; wherein the pre-shrinkage rate of the cotton decorative ribbon is 3% to 5%, and the pre-shrinkage rate of the blended decorative ribbon is 2% to 3%.

3. The efficient sewing method for cap wall decorative tape according to claim 1 is characterized in that: The positioning mold adopts an adjustable structure so as to be adjusted according to the sizes of the cap wall and the decorative band of different styles.

4. The efficient sewing method for cap wall decorative tape according to claim 1 is characterized in that: In step S200, when the position is fixed by the hot melt adhesive film, the melting point of the hot melt adhesive film is selected according to the material of the cap wall and the decorative band. When the cap wall and the decorative band are made of cotton, the melting point of the hot melt adhesive film is 100° C. to 120° C.; when the cap wall is made of chemical fiber and the decorative band is a blended decorative band, the melting point of the hot melt adhesive film is 80° C. to 100° C. When the position is fixed by the hot melt adhesive film, the hot melt adhesive film is evenly laid on the bonding surface of the cap wall and the decorative strip, and is heated for 5s to 10s by a heating device with a heating temperature 10°C to 20°C higher than the melting point of the hot melt adhesive film. After the hot melt adhesive film is cooled, the cap wall and the decorative strip are fixed in position.

5. The efficient sewing method for cap wall decorative tape according to claim 1 is characterized in that: During the sewing process in step S400 , a sewing trajectory of the decorative tape is projected onto the workbench of the sewing machine based on a laser-assisted positioning system.

6. The efficient sewing method for cap wall decorative tape according to claim 1 is characterized in that: In the step S500, it also includes a quality inspection of the cap wall decorative band after shaping and ironing, and the quality inspection includes an appearance inspection and a sewing strength inspection of the cap wall decorative band; and the sewing strength inspection satisfies the sewing strength greater than 5N / cm, and the sewing strength = tension value / decoration band width.

7. The efficient sewing method for cap wall decorative tape according to claim 1 is characterized in that: In step S400, when sewing, at the turning or corner portion of the decorative tape, the sewing machine reduces the sewing speed by 30% to 50%, and adjusts the sewing stitch length in the sewing parameters by shortening the sewing stitch length by 20% to 30%, and increasing the stitch density by 20% to 40%.

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