阅读说明：本技术 涂布机的精密挤出模头 (Precision extrusion die head of coating machine ) 是由 傅文正 傅叔贤 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种涂布机的精密挤出模头,包括上模、下模和垫片,所述上模和下模相扣配合安装,所述垫片安装在上模和下模之间,所述下模中设有浆料入口和流道,浆料入口从下模的外部延伸至所述流道；所述流道中设有精密刮刀将流道分割为两个小流道,所述精密刮刀与流道的底面之间留有缝隙。本发明所述的涂布机的精密挤出模头,浆料从浆料入口进入料槽后经过精密刮刀经过多次刮除、料浆压力多次平衡后,进入挤出狭缝时压力得到高度一致,浆料从狭缝挤出后到唇口,使得挤出时涂层横向上厚度是一致的,达到精密涂布的效果,从而彻底解决挤出模头横向厚度中间厚及两边薄的问题。(The invention discloses a precise extrusion die head of a coating machine, which comprises an upper die, a lower die and a gasket, wherein the upper die and the lower die are buckled and matched with each other, the gasket is arranged between the upper die and the lower die, a slurry inlet and a flow passage are arranged in the lower die, and the slurry inlet extends to the flow passage from the outside of the lower die; a precision scraper is arranged in the flow channel to divide the flow channel into two small flow channels, and a gap is reserved between the precision scraper and the bottom surface of the flow channel. According to the precision extrusion die head of the coating machine, slurry enters the trough from the slurry inlet, is scraped for multiple times by the precision scraper, is balanced for multiple times, and enters the extrusion slit, so that the pressure is highly consistent, and the slurry is extruded from the slit to the lip, so that the transverse thickness of the coating is consistent during extrusion, the precision coating effect is achieved, and the problems of thick middle and thin two sides of the transverse thickness of the extrusion die head are thoroughly solved.)

1. The utility model provides a precision extrusion die head of coating machine, includes mould, lower mould and gasket, it detains the cooperation installation mutually to go up mould and lower mould, the gasket is installed between last mould and lower mould, be equipped with thick liquids entry and runner in the lower mould, the thick liquids entry extends to from the outside of lower mould the runner, a serial communication port, be equipped with the precision scraper in the runner and cut apart into two little runners with the runner, the upper end and the both sides of precision scraper are sealed, leave the gap between the lower extreme of precision scraper and the bottom surface of runner.

2. The precision extrusion die head of a coating machine according to claim 1, wherein the upper end of the precision scraper is fixed on the upper die, and two sides of the precision scraper are attached to the side walls of the flow passage during assembly.

3. The precision extrusion die head of a coating machine according to claim 1, wherein the upper end of the precision scraper and the bottom surface of the upper die are closed by a gasket, and both sides of the precision scraper are fixed at corresponding positions of the upper die.

4. The precision extrusion die head of a coating machine according to claim 2 or 3, wherein the width of the gap between the precision scraper and the bottom surface of the flow channel is 10-1000 μm; the flow channels are provided with 2-5, preferably 2, parallel flow channels. A precision scraper is arranged in each flow channel to divide the flow channel into two small flow channels, a gap is reserved between the precision scraper and the bottom surface of the flow channel, the two small flow channels of the same flow channel are communicated through the gap, the adjacent flow channels are communicated through a gap between an upper film and a lower film, one side of each flow channel on two sides is communicated with the slurry inlet, and the other side of each flow channel is communicated with the die head lip.

5. The precision extrusion die of a coating machine according to claim 2 or 3, wherein the shape of the cutting edge of the precision blade is circular arc, trapezoid or sharp angle.

6. The precision extrusion die of a coating machine according to claim 2 or 3, wherein the thickness of the precision scraper is 8-20 mm.

7. The precision extrusion die head of a coating machine according to claim 2, 3 or 4, wherein the gap between the upper die and the lower die is 250-1200 μm.

Technical Field

The invention belongs to the technical field of coating, and particularly relates to a precise extrusion die head of a coating machine.

Background

The precision extrusion die head of the coating machine is widely applied to the industries of electronics, photovoltaics, photosensitive materials, lithium batteries, permeable membranes, optical membranes, printing, textiles, leather and the like. As the core main part of the coating machine, namely the slit type extrusion die head, the slurry is mostly non-Newtonian mechanical fluid in the using process, and the slurry cannot be rapidly and uniformly distributed in a flow channel after entering a material groove due to the action of shearing force, so that the phenomenon that the middle of a coating is thick and two sides of the coating are thin generally occurs in the coating production process. In many technical documents and patents, there are many methods for improvement, such as placing a mesh plate with a thin middle and two dense sides at the feeding position, or using dovetail grooves or processing the extrusion opening into shapes with narrow sides and wide middle, or adjusting the size of the lip gap to achieve the most consistent transverse thickness of the coating film. However, any of the above methods is only suitable for coating a slurry with a certain viscosity and a certain extrusion flow rate, and is not generally applicable, and it is relatively difficult to adjust slurries with different viscosities and different coating speeds, and some methods may result in the rejection of the entire die with a high cost.

Disclosure of Invention

In order to solve the technical problem, the invention provides a precise extrusion die head of a coating machine, which comprises an upper die, a lower die and a gasket, wherein the upper die and the lower die are buckled and matched with each other, the gasket is arranged between the upper die and the lower die, a slurry inlet and a flow channel are arranged in the lower die, the slurry inlet extends to the flow channel from the outside of the lower die, a precise scraper is arranged in the flow channel to divide the flow channel into two small flow channels, and a gap is reserved between the precise scraper and the bottom surface of the flow channel.

Further, the width of a gap between the precision scraper and the bottom surface of the flow channel is 10-1000 microns; the flow channels are provided with 2-5 parallel flow channels, each flow channel is internally provided with a precision scraper which divides the flow channel into two small flow channels, a gap is reserved between the precision scraper and the bottom surface of the flow channel, the two small flow channels of the same flow channel are communicated through the gap, the adjacent flow channels are communicated through a gap between an upper film and a lower film, one side of each flow channel on two side edges is communicated with the slurry inlet, and the other side of each flow channel is communicated with the die head lip.

Further, the shape of the edge of the precision scraper is circular arc, trapezoid or sharp angle.

Further, the thickness of the precision scraper is 8-20 mm.

Furthermore, the thickness of the gasket between the upper die and the lower die is 250-1200 mu m.

According to the technical scheme, the invention has the advantages that: according to the precise extrusion die head of the coating machine, after slurry enters the trough from the slurry inlet, the slurry is scraped for multiple times by the precise scraper, the pressure of the slurry is balanced for multiple times, the pressure is consistent when the slurry enters the extrusion slit, and the slurry is extruded from the slit to the lip mouth, so that the transverse thickness of the coating is consistent when the coating is extruded; meanwhile, as the slurry is extruded from the bottom of the scraper, the slurry has no deposition and residue on two sides of the flow channel, thereby further stabilizing the fluid dynamic physical properties of the slurry, achieving precise coating and thoroughly solving the problems of thick middle and thin two sides of the transverse thickness of the extrusion die head. The invention also has the characteristic of wide coating window, and the coating flow, pressure, viscosity and gasket thickness have large tolerance on the coating process.