A device for manufacturing composite sheet

Abstract

The present invention relates to the field of disposable sanitary products manufacturing, and discloses a manufacturing device for composite sheets, including: a welding part, which is arranged in a production line for continuously conveying composite sheets, so that the composite sheets at specified positions are combined with each other. Among them, the welding part is equipped with an ultrasonic unit that can rotate around a first axis, and a welding bottom roller that cooperates with the ultrasonic unit and can rotate synchronously with the composite sheet around a second axis parallel to the first axis, and the ultrasonic unit is equipped with an ultrasonic welding head that contacts the composite sheet and can reduce the sliding friction between the composite sheet and the composite sheet. The present invention prevents the ultrasonic welding head from scratching the composite sheet in contact, reduces the sliding friction between the composite sheet and the composite sheet, avoids the wrinkles of the composite sheet and the accumulation of cotton wool at the ultrasonic welding head, and at the same time, the rolling ultrasonic welding head will not cause continuous extrusion of the composite sheet, avoiding glue seepage of the sheet.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary product manufacturing, in particular to a manufacturing device for a composite sheet. Background Art

[0002] At present, in the field of disposable sanitary products production, composite sheets are mostly welded by planar ultrasonic welding.

[0003] For example, Chinese patent application No. 2020202158434 discloses a manufacturing device for disposable wearing articles, which has an ultrasonic welder fixedly arranged on the transmission path of the disposable wearing articles, which includes an ultrasonic horn acting on the surface of the disposable wearing articles, and a welding roller that cooperates with the ultrasonic horn to realize the welding of the disposable wearing articles and can rotate around its own axis. The disposable wearing articles pass through the middle of the ultrasonic horn and the welding roller, and the ultrasonic horn and the welding roller act on the disposable wearing articles with a certain pressure to realize the welding of the disposable wearing articles. The device fuses the composite sheet by cooperating with the anvil on the roller through the ultrasonic horn.

[0004] However, the device has the following problems: when the composite sheet passes through the ultrasonic welding head along the process direction, the relatively stationary ultrasonic welding head will scratch the composite sheet in contact with it, generating sliding friction between the ultrasonic welding head and the sheet. Based on this friction, the movement of the welding area on the composite sheet is more lagging than that of other areas, resulting in defects such as skewing and wrinkling of the composite sheet, accumulation of cotton wool at the welding head, and glue seepage.

[0005] For another example, Chinese patent application No. 201921478700.6 discloses a disposable sanitary product manufacturing system, including a laminating unit, a traction unit, a sealing unit, a cutting unit, a conveying unit and a directional conveying unit arranged in sequence along the transmission path of the disposable sanitary product sheet; the sealing unit includes a rotating support component and a group of welding units arranged along the circumferential direction of the rotating support component and rotating with the rotating support component. Although the welding unit in the above device adopts a roller structure, the ultrasonic vibrator performs reciprocating motion on the welding anvil and rolls along its own axis during welding to complete the welding, but the reciprocating linear motion direction of the ultrasonic vibrator is inconsistent with the motion direction of the material, and the device is suitable for welding at the discontinuous position of the material, and cannot perform continuous welding of the material along the process direction.

[0006] In view of this, the present application aims to provide a manufacturing device for a composite sheet material to solve the above-mentioned problems existing in the prior art. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies in the prior art, the present invention provides a manufacturing device for a composite sheet material, which solves the problem that sliding friction between a conventional ultrasonic unit and the sheet material easily causes the composite sheet material to be skewed, wrinkled, have lint accumulation, and have glue seepage.

[0009] (II) Technical solution

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A manufacturing device for a composite sheet, comprising: a welding part, which is arranged in a production line for continuously conveying composite sheets, so that the sheets of composite sheets at specified positions are combined with each other. Wherein, the welding part is provided with an ultrasonic unit that can rotate around a first axis, and a welding bottom roller that cooperates with the ultrasonic unit and can rotate synchronously with the composite sheet around a second axis parallel to the first axis. The ultrasonic unit is provided with an ultrasonic welding head that contacts the composite sheet and can reduce the sliding friction between the composite sheet and the composite sheet. When working, the sheet is welded by the high-frequency vibration of the ultrasonic welding head. Since the sliding friction between the ultrasonic unit and the composite sheet is reduced, the material is particularly suitable for ultrasonic continuous welding under high-speed conditions, which prevents the material from wrinkling, enhances the welding strength, and increases the welding speed.

[0011] Furthermore, the shape of the ultrasonic horn is a flat cylinder. Furthermore, the ultrasonic horn is circular in a cross section perpendicular to the second axis, and when working, the diameter of the ultrasonic horn expands and contracts at a high frequency within a certain range, and the sheet is welded by squeezing the welding bottom roller.

[0012] Since the ultrasonic welding head has a limited length in the direction along the second axis, when the welding area of ​​the welding bottom roller is relatively large, at least two ultrasonic units may be selected.

[0013] Furthermore, a guide portion is provided on the upstream side of the welding portion, and the guide portion wraps the composite sheet on the welding bottom roller at a certain angle, so that the composite sheet is conveyed with a constant tension, thereby ensuring the flatness of the welding.

[0014] Furthermore, it also includes a driving unit, which is used to provide power to the ultrasonic unit to rotate along the second axis.

[0015] The ultrasonic unit also includes the following structure: in addition to the ultrasonic horn, the ultrasonic unit also includes a horn and a transducer, the ultrasonic horn, the horn and the transducer form a triple group, and the triple group can rotate around the second axis under the action of the driving part. In addition, the ultrasonic unit also has a cooling component, which is used to cool the transducer.

[0016] The driving part drives the ultrasonic unit in the following manner: the ultrasonic unit is provided with a pulley, which is connected to the driving part through a transmission component, and the transmission component can be a belt, a connecting rod, etc. Preferably, when two groups of ultrasonic units are provided, they can be driven synchronously by a driving part.

[0017] Compared with the prior art, the present invention provides a composite sheet processing device, which has the following beneficial effects:

[0018] Since the ultrasonic welding head can rotate around the first axis parallel to the second axis, and utilize the high-frequency expansion and contraction of the diameter of the welding head within a certain range, the welding of the sheet is achieved by squeezing the welding bottom roller, so that the ultrasonic welding head will not scratch the contacted composite sheet, thereby reducing the sliding friction between the ultrasonic welding head and the composite sheet, avoiding wrinkles on the composite sheet and cotton wool accumulation at the ultrasonic welding head. At the same time, the rolling ultrasonic welding head will not cause continuous squeezing of the composite sheet, thus avoiding glue penetration into the sheet.

[0019] In summary, the present invention has the characteristics of high welding strength and high welding speed, and can adapt to ultrasonic continuous welding under high-speed working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 It is a front view structural schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the ultrasonic unit of the present invention;

[0023] Figure 3 It is a schematic diagram of the arrangement of the welding bottom roller and the ultrasonic unit of the present invention.

[0024] Among them: 1. Ultrasonic unit; 2. Welding bottom roller; 3. Support frame; 4. Driving unit; 5. Composite sheet; 6. Synchronous belt; 7. Guide roller; 8. Ultrasonic welding head; 9. Angular contact rod; 10. Transducer; 11. Fan; 12. Pulley; 13. Mounting frame; 14. First axis; 15. Second axis; 16. Cross section. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example

[0027] like Figures 1 to 3 As shown, a manufacturing device for composite sheets includes a welding section, which is arranged in a production line for continuously conveying composite sheets so that the composite sheets at specified positions are bonded to each other; wherein,

[0028] The welding part includes an ultrasonic unit 1 that can rotate around a first axis 14 , and a welding bottom roller 2 that cooperates with the ultrasonic unit 1 and can rotate synchronously with the composite sheet 5 around a second axis 15 parallel to the first axis 14 .

[0029] The ultrasonic unit 1 and the welding bottom roller 2 of the welding part are respectively mounted on a support frame, which is a square support frame 3 having a sufficiently large structural strength.

[0030] The specific structure of the ultrasonic unit is described in detail below.

[0031] The ultrasonic unit 1 is provided with an ultrasonic horn 8 which contacts the composite sheet 5 and can reduce the sliding friction between the composite sheet 5 and the ultrasonic horn 8. The shape of the ultrasonic horn 8 is a flat cylindrical shape, and is circular on the cross section 16 perpendicular to the second axis 15. During the ultrasonic welding process, the high-frequency electrical signal is converted into the high-frequency vibration of the ultrasonic horn 8 by the transducer 10. The diameter of the ultrasonic horn 8 expands and contracts at a high frequency within a certain range. The sheet is welded by squeezing the welding bottom roller 2, so that the ultrasonic horn 8 will not scratch the composite sheet 5 in contact, and the sliding friction between the ultrasonic horn 8 and the composite sheet 5 is reduced. Since the sliding friction between the ultrasonic unit and the composite sheet is reduced, the material is particularly suitable for ultrasonic continuous welding under high-speed working conditions, avoiding the wrinkles of the composite sheet 5 and the accumulation of cotton wool at the ultrasonic horn 8, enhancing the welding strength, and increasing the welding speed. At the same time, the rolling ultrasonic horn 8 will not cause continuous squeezing of the composite sheet 5, avoiding the glue penetration of the sheet.

[0032] The ultrasonic unit 1 also has a variable amplitude rod 9, a transducer 10, a cooling assembly, a pulley 12 and a mounting frame 13, wherein the ultrasonic welding head 8, the variable amplitude rod 9 and the transducer 10 form a triple group, which can rotate around the second axis 15 under the action of the driving part 4, and the cooling assembly has a fan 11 for cooling the transducer to ensure long-term operation of the equipment.

[0033] The driving part 4 is installed above the supporting frame 3, and drives the pulley 12 on the ultrasonic unit 1 to rotate around its own axis through the synchronous belt 6, thereby driving the ultrasonic welding head 8 and the transducer 10 to rotate. In addition, a guide part is also provided on the upstream side of the welding part, and the guide part includes a guide roller 7 to wrap the composite sheet 5 on the welding bottom roller 2 at a certain angle, so that the composite sheet 5 is transported with a constant tension.

[0034] Since the ultrasonic welding head 8 has a limited length in the direction along the second axis 15, when the welding area of ​​the welding bottom roller 2 is relatively large, two ultrasonic units 1 may be selected.

[0035] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A composite sheet manufacturing device, characterized in that include: The welding section is arranged in a production line for continuously conveying composite sheets so that the composite sheets at predetermined positions are bonded to each other; wherein, The welding part is provided with an ultrasonic unit capable of rotating around a first axis, and a welding bottom roller matched with the ultrasonic unit and capable of rotating synchronously with the composite sheet around a second axis parallel to the first axis, the ultrasonic unit is provided with a rolling ultrasonic welding head that contacts with the composite sheet and can reduce sliding friction between the composite sheet and the ultrasonic unit; The shape of the ultrasonic horn is a flat cylinder, and it is circular in the cross section perpendicular to the second axis. During the ultrasonic welding process, the high-frequency vibration of the ultrasonic horn causes it to expand and contract at a high frequency in the cross-sectional direction, and the sheet is welded by squeezing the welding bottom roller. At the same time, the rolling ultrasonic horn will not cause continuous squeezing to the composite sheet.

2. A composite sheet manufacturing device according to claim 1, characterized in that: At least two ultrasonic units are provided.

3. The manufacturing device of a composite sheet according to claim 1, characterized in that: A guide portion is also provided on the upstream side of the welding portion, and the guide portion wraps the composite sheet on the welding bottom roller at a certain angle, so that the composite sheet is conveyed with a constant tension.

4. A composite sheet manufacturing device according to claim 1 or 2, characterized in that: The invention also includes a driving part for providing power to the ultrasonic unit to rotate along the second axis.

5. The manufacturing device of a composite sheet according to claim 4, characterized in that: The ultrasonic unit also has a horn and a transducer. The ultrasonic welding head, the horn and the transducer form a triple group, and the triple group can rotate around the second axis under the action of the driving part.

6. The manufacturing device of a composite sheet according to claim 5, characterized in that: The ultrasonic unit also has a cooling component, which is used to cool the transducer.

Images