Process for producing filter bag by utilizing melt-blowing method, and filter device

Abstract

The invention provides a process for producing a filter bag by utilizing a melt-blowing method, and a filter device, and relates to the technical field of air filtering devices. The technical problemthat in the prior art, a wrinkled filter bag is difficult to form through an existing process is solved. The process for producing the filter bag through the melt-blowing method comprises the steps offeeding, heating extrusion, filtering, spinning forming, pressing mold shaping, electret and demolding. A flowable melt is formed by raw materials through feeding and heating extrusion, the flowablemelt is sprayed to a forming mold through spinning forming, the forming mold comprises a normal-temperature mold, and shaping ribs are arranged in the circumferential direction of the normal-temperature mold; and the filter device comprises a supporting device and the melt-blown filter bag arranged on the outer side of the supporting device in a sleeving mode. The filter bag matched with the forming mold in shape can be manufactured, the process is simple, the efficiency is high, and the obtained filter bag is stable in form and structure, low in cost, capable of filtering out dust, droplets,viruses and the like, good in filter effect and wide in application range.

Description

technical field [0001] The invention relates to the technical field of air filter devices, in particular to a process for producing filter bags by a melt blown method and a filter device. Background technique [0002] In daily life, meltblown cloth is the core material of masks. It can filter tiny non-oily particles in the process of filtering air, and can effectively isolate aerosols and droplets containing viruses. In the field of respiratory filter devices, meltblown cloth Spray cloth is widely used in masks due to its excellent filtering effect, but melt blown cloth often cannot be folded into a specific shape and structure through post-folding due to its own flexibility; while the existing round tube air filter element has a columnar shape as a whole , the outer wall forms uniform folds, and its fold structure is usually realized by folding, but when the folding method is directly applied to the melt-blown cloth, it is often impossible to form folds, which greatly limit...

AI Technical Summary

Problems solved by technology

[0003] One of the purposes of the present invention is to provide a process for producing filter bags by melt-blown method, so as to solve the technical problems existing in the prior art that the pleated filter bags are difficult to form through the existing process; many technical solutions provided by the present invention Many technical effects that can be produced by the optimal technical scheme in (the normal temperature mold includes an extension section and a connecting section, the shaped ribs are arranged on the connecting section, and the extending section and the connecting section enable the flowable melt to be formed into an annular installation section and a pleated filter respectively Sections are used for installation and air filtration respectively; after spinning forming, the filter bag is shaped with a shaping tool to make its shape and structure more fixed, which is convenient for later installation; during the spinning forming process, only the side wall and bottom wall of the forming mold Spinning can form a filter bag with an opening at the top, which is convenient for the installation of the filter bag. After demoulding, it also includes tail sealing. Ultrasonic welding technology is used to weld the seams of the formed filter bag to make the filter bag structure more firm. Ensure the integrity of the filter bag structure, so as to ensure the filtering effect of the filter bag; the forming mold also includes a high temperature mold, the normal temperature mold is set inside the high temperature mold, and the flowable melt is sprayed onto the normal temperature mold through the spinneret hole on the high temperature mold, The filter bag with the top opening structure can be directly obtained without post-sealing treatment. At the same time, the high-temperature mold has a higher temperature, which can effectively avoid the plugging of the spinneret hole due to the cooling of the melt, and the quality of the formed filter bag is superior, etc.); details see below

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