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EP-4470770-B1 - FIBERGLASS BOARD, REAR COVER, ELECTRONIC DEVICE, AND PREPARATION METHOD FOR FIBERGLASS BOARD

EP4470770B1EP 4470770 B1EP4470770 B1EP 4470770B1EP-4470770-B1

Inventors

  • SHEN, Kui
  • TAN, Dongsheng
  • LI, JIANPING

Dates

Publication Date
20260506
Application Date
20230421

Claims (15)

  1. A glass fiber board (121), comprising a plurality of glass fiber layers (10) disposed in a stacking manner, wherein each glass fiber layer comprises a plurality of first fibers (11) and a plurality of second fibers (12), the plurality of first fibers (11) and the plurality of second fibers (12) are disposed in an interlacing manner, each glass fiber layer has a first direction and a second direction, the plurality of first fibers (11) extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer, the plurality of second fibers (12) extend along the second direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer, the plurality of glass fiber layers comprise one or more composite glass fiber layers, the plurality of second fibers (12) in each composite glass fiber layer comprise one or more third fibers (13), and toughness of the third fiber (13) is greater than toughness of a glass fiber, and a helical staggering angle between at least two glass fiber layers (10) is greater than 0 degrees and less than 90 degrees or is greater than 90 degrees and less than 180 degrees, wherein a helical staggering angle between two glass fiber layers (10) is an included angle between the first directions of the two glass fiber layers (10), or a helical staggering angle between two glass fiber layers (10) is an included angle between the second directions of the two glass fiber layers (10).
  2. The glass fiber board (121) according to claim 1, wherein a helical staggering angle between any two glass fiber layers (10) is greater than 0 degrees and less than 180 degrees, or greater than 0 degrees and less than 90 degrees, or greater than 0 degrees and less than or equal to 45 degrees.
  3. The glass fiber board (121) according to claim 2, wherein a helical staggering angle between two adjacent glass fiber layers (10) is greater than 0 degrees and less than or equal to 45 degrees.
  4. The glass fiber board (121) according to any one of claims 1 to 3, wherein in each glass fiber layer, both the plurality of first fibers (11) and the plurality of second fibers (12) are glass fibers.
  5. The glass fiber board (121) according to any one of claims 1, wherein the strength of the third fiber is greater than strength of the glass fiber.
  6. The glass fiber board (121) according to claim 1 or claim 5, wherein there are a plurality of third fibers, and the plurality of third fibers are arranged at uniform intervals along a first direction of the composite glass fiber layer; and the third fiber is an aramid fiber or a carbon fiber.
  7. The glass fiber board (121) according to claim 1 or 5 or 6, wherein in each composite glass fiber layer, the plurality of second fibers (12) further comprise one or more fourth fibers, and the fourth fiber is a glass fiber, and there are a plurality of third fibers and a plurality of fourth fibers, and the plurality of third fibers and the plurality of fourth fibers are alternately arranged along the first direction of the composite glass fiber layer.
  8. The glass fiber board (121) according to claim 1 or 5 to 7, wherein in each composite glass fiber layer, each second fiber is the third fiber.
  9. The glass fiber board (121) according to any one of claims 1 or 5 to 8, wherein in each composite glass fiber layer, the plurality of first fibers (11) are all glass fibers.
  10. The glass fiber board (121) according to any one of claims 1 or 5 to 8, wherein in each composite glass fiber layer, the plurality of first fibers (11) comprise one or more fifth fibers, and toughness of the fifth fiber is greater than the toughness of the glass fiber.
  11. The glass fiber board (121) according to any one of claims 1 or 5 to 10, wherein each glass fiber layer is the composite glass fiber layer.
  12. A glass fiber board (121), comprising a plurality of glass fiber layers (10) that are disposed in a stacking manner, wherein each glass fiber layer comprises a plurality of first fibers (11) and a plurality of second fibers (12), each glass fiber layer has a first direction and a second direction, the plurality of first fibers (11) extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer, and the plurality of second fibers (12) extend along the second direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer; and the plurality of glass fiber layers (10) comprise one or more composite glass fiber layers (10), the plurality of second fibers (12) in each composite glass fiber layer comprise one or more third fibers (13), and toughness of the third fiber is greater than toughness of a glass fiber.
  13. The glass fiber board (121) according to claim 12, wherein a helical staggering angle between any two glass fiber layers (10) is 0 degrees.
  14. A back cover, comprising the glass fiber board (121) according to any one of claims 1 to 13 and a decorative layer, wherein the decorative layer is disposed on a bottom surface of the glass fiber board (121).
  15. An electronic device, comprising the back cover according to claim 14 and a frame, wherein the back cover is mounted on one side of the frame.

Description

This application claims priority to Chinese Patent Application No. 202210905853.4, filed with the China National Intellectual Property Administration on July 29, 2022 and entitled "GLASS FIBER BOARD, BACK COVER, ELECTRONIC DEVICE, AND PREPARATION METHOD FOR GLASS FIBER BOARD". TECHNICAL FIELD This application relates to the field of electronic device technologies, and in particular, to a glass fiber board, a back cover, an electronic device, and a preparation method for a glass fiber board. BACKGROUND With continuous development of science and technology, electronic devices such as mobile phones are widely used in people's daily life and work, and have become indispensable daily articles. In a current electronic device, a glass fiber board (also referred to as a fiberglass board) is usually used to prepare a back cover to implement a lightweight design of the electronic device. However, the glass fiber board has poor puncture resistance, which reduces reliability of use of the electronic device. CN 206465569 U discloses a high-strength shear-resistant fiberreinforced laminate structure obtained by laminating at least two layers of fiberglass mesh in turn and thermoforming, and the layers of fiberglass mesh are arranged in a staggered manner. US 2016/0107349 Al discloses a composite sheet, an electronic apparatus and a method for producing a component from composite sheet. US 2021/339499 A1 discloses shock and impact resistant structures. Particularly, it discloses materials having a helicoidal architecture. SUMMARY The present invention is defined by the appended claims. This application provides a glass fiber board, a back cover, an electronic device, and a preparation method for a glass fiber board, to improve puncture resistance of the glass fiber board and improve reliability of use of the electronic device. According to a first aspect, this application provides a glass fiber board, including a plurality of glass fiber layers, and the plurality of glass fiber layers are disposed in a stacking manner. Each glass fiber layer includes a plurality of first fibers and a plurality of second fibers, and the plurality of first fibers and the plurality of second fibers are disposed in an interlacing manner. Each glass fiber layer has a first direction and a second direction. The plurality of first fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the second direction of the glass fiber layer. The plurality of second fibers extend along the first direction of the glass fiber layer and are arranged at intervals along the first direction of the glass fiber layer. A helical staggering angle is formed between any two glass fiber layers. A helical staggering angle between two glass fiber layers is an included angle between the first directions of the two glass fiber layers, or a helical staggering angle between two glass fiber layers is an included angle between the second directions of the two glass fiber layers. A helical staggering angle between at least two glass fiber layers is greater than 0 degrees and less than 90 degrees or is greater than 90 degrees and less than 180 degrees. In other words, at least two glass fiber layers are helically stacked in a staggering manner. In the glass fiber board shown in this application, at least two glass fiber layers are helically stacked in a staggering manner, and the first fibers and the second fibers of the at least two glass fiber layers are disposed in a staggering manner in a star shape, thereby increasing an inter-layer binding force between the plurality of glass fiber layers. When the glass fiber board is subjected to a puncture force F, the puncture force F may be transmitted along extending directions of the first fibers and the second fibers of the plurality of glass fiber layers. Because at least two glass fiber layers are helically stacked in a staggering manner, the puncture force F may be transmitted along a plurality of directions, so that a force area of the glass fiber board is increased, a stress dispersion effect of the glass fiber board is enhanced, and a synergistic toughening capability inside the glass fiber board is increased, thereby improving puncture resistance of the glass fiber board. In an implementation, the first direction and the second direction of the glass fiber layer are perpendicular to each other. In an implementation, the glass fiber layer is formed by weaving the plurality of first fibers and the plurality of second fibers. In an implementation, the helical staggering angle between any two glass fiber layers is greater than 0 degrees and less than 180 degrees. In other words, the plurality of glass fiber layers are helically stacked in a staggering manner, and the first fibers and the second fibers of any two glass fiber layers are disposed in a staggering manner in a star shape, thereby increasing an inter-layer binding force between the plurality of glass fiber layers. When the g