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CN-121989527-A - Cover plate structure and preparation method thereof

CN121989527ACN 121989527 ACN121989527 ACN 121989527ACN-121989527-A

Abstract

The invention discloses a cover plate structure and a preparation method thereof, and relates to the technical field of composite material manufacturing, in particular to a cover plate body, wherein the side wall of the cover plate body is provided with edge banding strips, and the edge banding strips are integrally connected with the cover plate body; the cover plate body is of a multi-film composite structure and sequentially comprises a first ceramic fiber layer, a second ceramic fiber layer, a PI film layer, a third ceramic fiber layer and a fourth ceramic fiber layer from top to bottom. The invention provides additional support for the cover plate body by using the edge sealing strip, reduces the probability of deformation or damage of the cover plate when the cover plate is subjected to external force, improves the strength of the cover plate structure, ensures that the cover plate keeps a stable shape in the normal use process, can protect the cover plate body, reduces the cracking condition of the edge part of the cover plate body caused by stress concentration, and prolongs the service life of the cover plate structure.

Inventors

  • WANG DONG
  • ZHENG GANGMIN
  • Yi Zhenqing
  • YUAN JIANQING

Assignees

  • 深圳市合川智能股份有限公司

Dates

Publication Date
20260508
Application Date
20260224

Claims (10)

  1. 1. The cover plate structure comprises a cover plate body and is characterized in that an edge sealing strip (8) is arranged on the side wall of the cover plate body, the edge sealing strip (8) is integrally connected with the cover plate body, the cover plate body is of a multi-film-layer composite structure and sequentially comprises a first ceramic fiber layer (2), a second ceramic fiber layer (3), a PI film layer (4), a third ceramic fiber layer (5) and a fourth ceramic fiber layer (6) from top to bottom.
  2. 2. The cover plate structure according to claim 1, wherein the cover plate body is integrally formed with adjacent film layers by hot press molding, and the edge sealing strip (8) is integrally connected with the cover plate body by an injection molding process.
  3. 3. The preparation method of the cover plate structure is characterized by comprising the following steps of: Step one, designing and manufacturing a hot-pressing die lower die, a hot-pressing die upper die, a transferring tool and an injection upper die which are matched with the hot-pressing die lower die, wherein the hot-pressing die lower die, the hot-pressing die upper die and the transfer tool are matched with the hot-pressing die lower die; Step two, respectively carrying out coiling and uncoiling operations on the ceramic fiber prepreg coiled material, the release film coiled material and the PI film coiled material to prepare a ceramic fiber sheet, a release film sheet and a PI film sheet with the required sizes for producing the cover plate structure; Step three, a piece of release film sheet prepared in the step two is paved on a bottom plate (1) of a transferring tool, then the ceramic fiber sheet and the PI film sheet prepared in the step two are overlapped on the release film sheet according to a preset sequence to form a material overlapping structure, and a piece of release film sheet is paved on the top of the material overlapping structure to form a pre-hot pressing material; Transferring the transfer tool and the preheated pressing material into a lower die of a hot-pressing die, closing an upper die of the hot-pressing die and the lower die of the hot-pressing die, forming the hot-pressing die, performing hot-pressing forming treatment, integrally forming a stacked material structure through a hot-pressing process to obtain a hot-pressing blank, and keeping a separate state all the time from a membrane material; And fifthly, taking out the cover plate blank, tearing off the release film sheet, and cutting the redundant structure to form the cover plate structure.
  4. 4. The method for manufacturing a cover plate structure according to claim 3, wherein in the third step, the stacking sequence of the sheets in the stacking structure is sequentially two layers of ceramic fiber sheets, PI film sheets and two layers of ceramic fiber sheets from bottom to top.
  5. 5. The method of claim 3, wherein in the fourth step, the hot press molding temperature is 145-155 ℃, the pressure is 100T, the dwell time is 450 s+ -30 s, and the temperature rising speed is controlled by a step temperature rising method.
  6. 6. The method for manufacturing the cover plate structure according to claim 3, wherein the transferring tool comprises a bottom plate (1), a side frame (7) is detachably connected to the side edge of the top of the bottom plate (1), a groove (9) matched with the stacking structure is formed in the middle of the top of the bottom plate (1), and the thickness value of the groove (9) is the same as that of the release film.
  7. 7. The method for manufacturing a cover plate structure according to claim 6, wherein the height of the side frames (7) is larger than that of the stacking structure.
  8. 8. A method for manufacturing a cover plate structure according to claim 3, wherein the injection molding temperature of the edge sealing strip (8) is not higher than 75% -80% of the deformation temperature of the hot-pressed blank.
  9. 9. The method of claim 3, wherein the injection upper mold presses the hot-pressed blank in a pressure maintaining state, and the pressure range is 5-10MPa.
  10. 10. A method of manufacturing a cover structure according to claim 3, wherein a cover structure according to claim 1 is manufactured by using a method of manufacturing a cover structure according to claim 3.

Description

Cover plate structure and preparation method thereof Technical Field The invention relates to the field of composite material manufacturing, in particular to a cover plate structure and a preparation method thereof. Background The cover plate is used as a key function and appearance component of electronic equipment, vehicles, household electrical appliances and industrial equipment, has the core effects of protecting internal precise elements from external physical impact, liquid erosion and dust pollution, simultaneously provides functions of touch interaction, light transmission display or decorative appearance and the like, and gradually evolves into a multi-layer composite structure from a traditional single material along with the development of terminal products in the directions of thinning, high integration and multi-scene application. However, in the prior art, the preparation process of the multi-layer composite structure cover plate generally comprises the steps of stacking all layers of materials forming the cover plate layer by layer according to a design sequence to form a preassembled body, transferring the whole stacked body into a mold for hot press molding, wherein the rigidity and the dimensional stability of the multi-layer materials are lower, and the quality of the formed cover plate is finally directly influenced by the fact that the layers are easily subjected to relative sliding due to the fact that the layers are separated from an initial stacking tool and are transferred to the mold under the influence of operating personnel manipulation difference, mechanical transmission vibration or environmental airflow disturbance. The current composite layers are connected by mainly relying on glue bonding or hot-pressing physical bonding, but the difference of thermal expansion coefficients of different materials is remarkable, and under the high-temperature environment of hot-pressing forming or the temperature cycle in subsequent use, the difference of the expansion and contraction amounts of the materials of each layer is extremely large, so that internal stress is easily generated at an interface between the layers. The internal stress can cause microcrack, layering or local debonding of interfaces, the optical transmittance and touch sensitivity of the cover plate are affected slightly, the functional failure is directly caused by heavy stress, and the application reliability of the multi-layer composite cover plate in high-end scenes (such as aerospace and precise instruments) is severely restricted. Based on the above, the application provides a cover plate structure and a preparation method thereof. Disclosure of Invention The cover plate structure and the preparation method thereof have the advantages that the rigidity of materials is greatly improved through superposition molding of the ceramic-based curing sheet and the PI materials, the side wall of the cover plate body is protected by the edge sealing strip, the cracking and deformation probability of the cover plate structure is reduced, the preparation method of the cover plate structure is optimized, the intermediate step of taking out the overlapped materials from a transfer tool and putting the overlapped materials into a mold again for positioning is omitted, seamless connection of the transfer-hot pressing process is realized, the hot pressing blank transfer step is omitted, the injection upper mold and the hot pressing mold lower mold form an injection mold only through replacement of the injection upper mold, the production efficiency and the production precision of the cover plate structure are improved, and the technical problems raised by the background technology are solved. In order to achieve the purpose, the cover plate structure comprises a cover plate body, wherein the side wall of the cover plate body is provided with edge sealing strips, the edge sealing strips are integrally connected with the cover plate body, the cover plate body is of a multi-film-layer composite structure, and the cover plate body sequentially comprises a first ceramic fiber layer, a second ceramic fiber layer, a PI film layer, a third ceramic fiber layer and a fourth ceramic fiber layer from top to bottom. Preferably, the cover plate body is formed into a whole by a hot press molding mode, and the edge sealing strip is integrally connected with the cover plate body by an injection molding process. The preparation method of the cover plate structure comprises the following steps: Step one, designing and manufacturing a hot-pressing die lower die, a hot-pressing die upper die, a transferring tool and an injection upper die which are matched with the hot-pressing die lower die, wherein the hot-pressing die lower die, the hot-pressing die upper die and the transfer tool are matched with the hot-pressing die lower die; Step two, respectively carrying out coiling and uncoiling operations on the ceramic fiber prepreg coiled material, the rel