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CN-121988180-A - Array type flat plate film and preparation method thereof

CN121988180ACN 121988180 ACN121988180 ACN 121988180ACN-121988180-A

Abstract

The invention relates to the technical field of filtering films and discloses an array type flat plate film and a preparation method thereof, wherein the array type flat plate film comprises two layers of filtering films which are arranged up and down symmetrically and a supporting film which is positioned between the two layers of filtering films, and the filtering films and the supporting film continuously extend along the length direction of the film and are combined to form a plurality of long and narrow tube cavities which extend along the length direction and are distributed along the width direction of the film in an array manner; the bonding area extending along the length direction of the membrane is arranged between the adjacent elongated tubular cavities, the bonding area is formed by bonding the filtering membrane and the supporting membrane after thermal bonding treatment, a sewing structure extending along the length direction of the membrane is arranged in the bonding area, an adhesive medium is attached to the surface of the sewing line, and the adhesive medium is filled in a pinhole formed by the sewing structure and is bonded with the filtering membrane and the supporting membrane, so that a composite reinforcing structure is formed at the bonding area.

Inventors

  • FAN WENBO
  • WEI QIANQIAN

Assignees

  • 苏州膜佰特过滤科技有限公司

Dates

Publication Date
20260508
Application Date
20260209

Claims (10)

  1. 1. The array type flat membrane is characterized by comprising two layers of filtering membranes which are arranged up and down symmetrically and a supporting membrane positioned between the two layers of filtering membranes, wherein the filtering membranes and the supporting membrane continuously extend along the length direction of the membrane and are combined to form a plurality of long and narrow tube cavities extending along the length direction, and the long and narrow tube cavities are distributed in an array manner along the width direction of the membrane; A bonding area which extends continuously along the length direction of the membrane is arranged between the adjacent elongated tubular cavities, and the bonding area is formed by mutually bonding the filtering membrane and the supporting membrane after heat bonding treatment; A suture structure extending along the length direction of the membrane is arranged in the combination area, and the suture structure comprises a suture thread penetrating through the filtering membrane and the supporting membrane; the surface of the suture line is adhered with an adhesive medium, the adhesive medium is filled in a pinhole formed by the suture structure and is adhered with the filtering membrane and the supporting membrane, and the combined area forms a composite reinforcing structure formed by the thermal bonding structure, the suture structure and the adhesive medium.
  2. 2. The array-type flat sheet membrane of claim 1, wherein the support membrane is any one of a PET nonwoven fabric, a PP nonwoven fabric, or a PET sheet material.
  3. 3. The array panel film of claim 1, wherein the suture is any one of nylon, dacron or spandex.
  4. 4. The array panel film of claim 1, wherein the adhesive medium is any one of polyurethane glue, epoxy glue, or photo-curable glue.
  5. 5. The array panel film of claim 1, wherein the bonding region has a predetermined width in the film width direction that is greater than the diameter of the individual stitch lines to form a ribbon-shaped composite reinforcement structure.
  6. 6. A method of producing an array type flat sheet membrane according to any one of claims 1 to 5, comprising the steps of: S1, respectively feeding an upper layer of filtering membrane and a lower layer of filtering membrane into a forming roller assembly, and performing extrusion forming on the filtering membrane through the forming roller assembly to enable the filtering membrane to form a membrane structure which continuously undulates along the width direction; s2, arranging a support film between the upper filtering film and the lower filtering film, and enabling the formed filtering film and the support film to be attached at a preset position and form a combination area extending along the length direction; S3, carrying out thermal bonding on the filtering membrane and the supporting membrane at the bonding area to fix the three-layer membrane structure; S4, feeding the thermally bonded three-layer film structure into a stitching device, stitching at the joint area, and introducing an adhesive medium in the stitching process.
  7. 7. The method of claim 6, wherein the forming roller assembly comprises an upper forming roller module and a lower forming roller module which are oppositely arranged, and each forming roller module comprises a female die and a male die which are mutually matched.
  8. 8. The method according to claim 7, wherein the upper and lower sets of molding roll modules are respectively located at the upper and lower sides of the support film, and the axis connecting line of the female die and the male die in each molding roll module forms an included angle with respect to the support film.
  9. 9. The method of claim 8, wherein the dies in the upper and lower die sets are disposed adjacent to each other, and wherein the die edges formed on the die surfaces are aligned during the extrusion process to press the filter membrane against the support membrane.
  10. 10. The method of manufacturing a quilter of claim 6, wherein the sewing device is a multi-needle quilter, the multi-needle quilter comprises a film limiting body which is arranged symmetrically up and down, limiting grooves which are matched with the three-layer film structure in shape are arranged on the film limiting body, a plurality of pinholes which are arranged at intervals along the width direction of the film are also arranged on the film limiting body, and the pinholes are in one-to-one correspondence with the bonding areas along the width direction; the multi-needle quilter is characterized in that the multi-needle quilter is further provided with an adhesive medium introducing device positioned on the upper side of the film limiting body, the adhesive medium introducing device comprises an open groove for accommodating adhesive medium, and the bottom wall of the open groove is provided with through holes corresponding to the pinholes one by one.

Description

Array type flat plate film and preparation method thereof Technical Field The invention belongs to the technical field related to filtering membranes, and particularly relates to an array type flat membrane and a preparation method thereof. Background The filtering membrane component is widely applied to the fields of water treatment, liquid separation, biological engineering, chemical process and the like, wherein the flat membrane is widely applied to a membrane filtering system due to the advantages of compact structure, high filling density, easy cleaning and maintenance and the like. In the prior art, in order to increase the flux per unit area of a flat membrane, a plurality of fluid channels are often formed in a membrane structure in parallel to increase the effective filtration area. The existing array type flat membrane structure generally forms an internal flow channel structure by laminating, pressing or welding a plurality of membrane materials. However, in practical application, the above structure still has the following disadvantages: On one hand, the bonding area formed by means of hot melt welding or ultrasonic welding is easy to generate fatigue cracking or local stripping at a welding interface under the condition of long-term operation or repeated pressure impact, so that the overall structural stability of the membrane assembly is affected; On the other hand, when the multilayer film structure is mechanically reinforced by adopting a stitching mode, a pinhole structure formed by stitching thread penetration is easy to become a potential leakage channel, and especially under the working condition of liquid filtration or gas-liquid separation, the sealing reliability of a pinhole part is difficult to ensure. In addition, in the prior art, aiming at the preparation method of the array type flat plate film, a step-by-step processing or intermittent process is adopted, so that the molding precision and the assembly consistency are difficult to control, and the realization of large-scale and continuous production is not facilitated. Therefore, how to improve the mechanical strength and sealing performance of the bonding area and realize a preparation method suitable for continuous production while ensuring the structural stability of the array type flat membrane becomes a technical problem to be solved in the field. Disclosure of Invention The invention provides an array type flat membrane and a preparation method thereof, which are used for overcoming the defects in the prior art. The invention discloses an array type flat membrane and a preparation method thereof, and aims and effects of the array type flat membrane are achieved by the following specific technical means: The array type flat membrane comprises two layers of filtering membranes which are arranged up and down symmetrically and a supporting membrane which is positioned between the two layers of filtering membranes, wherein the filtering membranes and the supporting membrane continuously extend along the length direction of the membrane and are combined to form a plurality of long and narrow tube cavities which extend along the length direction, and the long and narrow tube cavities are distributed in an array manner along the width direction of the membrane; A bonding area which extends continuously along the length direction of the membrane is arranged between the adjacent elongated tubular cavities, and the bonding area is formed by mutually bonding the filtering membrane and the supporting membrane after heat bonding treatment; A suture structure extending along the length direction of the membrane is arranged in the combination area, and the suture structure comprises a suture thread penetrating through the filtering membrane and the supporting membrane; the surface of the suture line is adhered with an adhesive medium, the adhesive medium is filled in a pinhole formed by the suture structure and is adhered with the filtering membrane and the supporting membrane, and the combined area forms a composite reinforcing structure formed by the thermal bonding structure, the suture structure and the adhesive medium. According to a further technical scheme, the supporting film is any one of PET non-woven fabric, PP non-woven fabric or PET plate. According to a further technical scheme, the suture line is made of any one of nylon, terylene or spandex. According to a further technical scheme, the adhesive medium is any one of polyurethane adhesive, epoxy adhesive or photo-curing adhesive. According to a further technical scheme, the bonding area is provided with a preset width along the width direction of the film, and the preset width is larger than the diameter of a single suture line so as to form a banded composite reinforcing structure. The preparation method of the array type flat membrane comprises the following steps: S1, respectively feeding an upper layer of filtering membrane and a lower layer of filtering membrane into a