CN114703694A - Preparation process of immersion type insulating aramid paper board by utilizing inertia - Google Patents
Preparation process of immersion type insulating aramid paper board by utilizing inertia Download PDFInfo
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- CN114703694A CN114703694A CN202210459049.8A CN202210459049A CN114703694A CN 114703694 A CN114703694 A CN 114703694A CN 202210459049 A CN202210459049 A CN 202210459049A CN 114703694 A CN114703694 A CN 114703694A
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- aramid fiber
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- fiber paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F13/00—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
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Abstract
The invention discloses a preparation process of an immersion type insulating aramid paper board by utilizing inertia, which comprises the following steps of preparing an aramid fiber sizing net, preparing aramid fiber paper pulp, placing the aramid fiber paper pulp in an aramid fiber paper pulp tank, uniformly stirring the aramid fiber paper pulp by adopting a stirring paddle, placing the aramid fiber sizing net prepared in advance at the bottom of the aramid fiber paper pulp tank, continuously stirring the aramid fiber paper pulp for 10s, then standing the aramid fiber sizing net at the bottom of the aramid fiber paper pulp tank for a period of time, rapidly lifting the aramid fiber sizing net at a constant speed upwards, dewatering and drying the prepared insulating aramid paper board, finally solidifying the surface of the dried insulating aramid paper board, finally cutting and packaging the prepared aramid paper, wherein the preparation process of the insulating aramid paper board is simple, and the thickness of the aramid paper is convenient to control, the prepared aramid paper has high integral strength.
Description
Technical Field
The invention relates to the technical field of preparation of immersion type insulating aramid fiber paper boards, in particular to a preparation process of an immersion type insulating aramid fiber paper board by utilizing inertia.
Background
Aramid fiber insulation paper belongs to aramid fiber composite materials and mainly comprises two types, namely meta-aramid fiber insulation paper, which is named as aramid fiber 1313 in China; and the other is para-aramid insulating paper, namely aramid 1414 in China.
Aramid insulating paper is applied more and more widely in the fields of safety protection, high-temperature filtration, electrical insulation, structural materials and the like, has higher and higher popularity, and becomes an indispensable important basic material in many fields of military, industry, science and technology and the like.
At present, the process for preparing the aramid fiber paper board used in industrial production is complex, the existing production method of the aramid fiber paper board almost adopts a net rack, and the produced paper board has long time.
Disclosure of Invention
The invention aims to provide a preparation process of an immersion type insulating aramid paper board, which is simple in preparation process, convenient to control the thickness of aramid paper and high in overall strength of the prepared aramid paper, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of an immersion type insulating aramid fiber paperboard by utilizing inertia comprises the following steps:
firstly, preparing an aramid fiber sizing net;
step two, preparing aramid fiber paper pulp, namely placing the aramid fiber paper pulp in an aramid fiber paper pulp groove;
step three, uniformly stirring aramid fiber paper pulp by adopting a stirring paddle, placing a prepared aramid fiber sizing net at the bottom of an aramid fiber paper pulp tank, and continuously stirring the aramid fiber paper pulp for 10 s;
step four, standing the aramid fiber sizing net at the bottom of the aramid fiber paper pulp tank for a period of time, rapidly lifting the aramid fiber sizing net at a constant speed upwards, standing the aramid fiber sizing net at the bottom of the aramid fiber paper pulp tank for 10s, rapidly moving the aramid fiber sizing net upwards at a speed of 1cm/s, moving the aramid fiber sizing net upwards at 3cm each time, standing the lifted aramid fiber sizing net right above the aramid fiber paper pulp tank for 10s, moving the aramid fiber sizing net downwards at first for 10cm, rapidly moving the aramid fiber sizing net upwards at 10cm at a speed which is 5 times of the speed of moving the aramid fiber sizing net downwards, and repeating the step 4 for 5-7 times to complete water removal;
step five, performing dewatering and drying treatment on the prepared insulating aramid paper board, taking the dewatered insulating aramid paper board from an aramid fiber sizing net, placing the dewatered insulating aramid paper board on the upper surface of a high-water-absorptivity sponge pad, adopting an electric heating roller to move back and forth for rolling, gradually increasing the downward pressure of the electric heating roller on the insulating aramid paper board in the moving process, increasing the temperature of the electric heating roller by 10 ℃ every time the temperature of the electric heating roller changes one direction, finishing secondary dewatering, placing the secondarily dewatered aramid fiber paper board in a high-temperature dehumidifier, applying pressure to the aramid fiber paper board by the high-temperature dehumidifier, increasing the temperature of the aramid fiber paper board by a table top of the high-temperature dehumidifier and a pressure plate applying pressure above the table top from the upper direction and the lower direction, heating the aramid fiber paper board to 250 ℃ from a normal temperature state, and dividing the heating process into three stages of 150 ℃, 200 ℃ and 250 ℃, and maintaining the temperature for 10-15min in each temperature environment;
and step six, curing the surface of the dried insulating aramid fiber paper board, injecting aramid fiber paper pulp into the upper surface and the lower surface of the dried aramid fiber paper board, placing the aramid fiber paper board with the surface coated with the aramid fiber paper pulp into a high-temperature dehumidifier for high-temperature and high-pressure surface curing treatment, placing the aramid fiber paper board subjected to high-temperature and high-pressure treatment into a low-temperature-100 ℃ cooling box for cooling for 10min, then placing the aramid fiber paper board under high temperature and high pressure for heating, and finally uniformly distributing small square holes on the surface of the aramid fiber paper board.
Preferably, the meshes of the aramid fiber sizing net in the step one are round holes, side retaining edges are arranged on the edges of the aramid fiber sizing net, the height of each side retaining edge is 8-10mm, and the bottom of each side retaining edge is not fixedly connected with the upper edge of the aramid fiber sizing net.
Preferably, the aramid fiber pulp in the step II comprises long aramid fibers and short aramid fibers, the content ratio of the long aramid fibers to the short aramid fibers is 3:1, the upper part of the aramid fiber pulp groove is in an open shape, and ultrasonic generators are arranged on the side walls of two sides of the aramid fiber pulp groove in a staggered mode.
Preferably, the aramid fiber pulp is stirred for 10 seconds in the aramid fiber pulp tank in the third step, the aramid fiber pulp is stopped being stirred, the ultrasonic generators on the side walls of the two sides of the aramid fiber pulp tank work after the stirring paddle is taken out, the aramid fiber in the aramid fiber pulp tank is driven, the vibration frequency of ultrasonic waves is 10KHz, the ultrasonic generators are arranged on the support at the top of the aramid fiber pulp tank, all the ultrasonic generators on the aramid fiber pulp tank aim at the aramid fiber pulp tank to emit the ultrasonic waves, the ultrasonic generators are stopped after being started for 3 seconds every time, the ultrasonic generators are started for three times, and the interval between every two starting of the ultrasonic generators is 3 seconds.
Compared with the prior art, the invention has the beneficial effects that:
(1) the height of the side retaining edge is 8-10mm, the bottom of the side retaining edge is not fixedly connected with the upper edge of the aramid fiber sizing net, the aramid fibers can be stacked higher through the side retaining edge, the aramid fiber paper is easier to form, and a gap between the side retaining edge and the aramid fiber sizing net is favorable for quickly discharging water and other liquid in the aramid fiber paper pulp;
(2) the aramid fibers with different lengths are combined for use, so that the aramid fibers in the aramid fiber paper are jointed more tightly, and the tightness of the aramid fiber paper board is better;
(3) the vibration frequency range of the ultrasonic wave is 10KHz, the aramid fiber in the aramid fiber paper pulp is vibrated by the ultrasonic wave, so that the aramid fiber is not precipitated to the bottom of the aramid fiber paper pulp under the action of gravity, and the aramid fiber is uniformly distributed in the aramid fiber paper pulp;
(4) the aramid fiber sizing net stands at the bottom of the aramid fiber pulp tank for 10s, then rapidly moves upwards at the speed of 1cm/s and moves upwards by 3cm each time, so that more aramid fibers in the aramid fiber pulp can be left on the aramid fiber sizing net due to rapid upwards movement, and the aramid fiber sizing net moves upwards while the aramid fiber pulp falls under the action of gravity, so that the aramid fiber pulp can fall on the aramid fiber sizing net more quickly after bidirectional acceleration is realized;
(5) the moisture in the wet aramid paper is separated from the aramid fibers by using inertia, and meanwhile, the distance between the aramid fibers in the aramid fiber paper board is reduced, so that the compactness of the aramid fiber paper board is better;
(6) the insulating aramid paper board adopts an immersion type preparation method, the preparation process is simple, the thickness of the aramid paper is convenient to control, and the prepared aramid paper is high in overall strength.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first" and "second," and the like, in the description and in the claims of embodiments of the present invention are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first parameter set and the second parameter set, etc. are used to distinguish different parameter sets, rather than to describe a particular order of parameter sets.
In the description of the embodiments of the present invention, the meaning of "a plurality" means two or more unless otherwise specified. For example, a plurality of elements refers to two elements or more than two elements.
The term "and/or" herein is an association relationship describing an associated object, and means that there may be three relationships, for example, a display panel and/or a backlight, which may mean: there are three cases of a display panel alone, a display panel and a backlight at the same time, and a backlight alone. The symbol "/" herein denotes a relationship in which the associated object is or, for example, input/output denotes input or output.
In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
The invention provides a technical scheme that: a preparation process of an immersion type insulating aramid fiber paperboard by utilizing inertia comprises the following steps:
firstly, preparing an aramid fiber sizing net;
step two, preparing aramid fiber paper pulp, namely placing the aramid fiber paper pulp in an aramid fiber paper pulp groove;
step three, uniformly stirring aramid fiber paper pulp by adopting a stirring paddle, placing a prepared aramid fiber sizing net at the bottom of an aramid fiber paper pulp tank, and continuously stirring the aramid fiber paper pulp for 10 s;
step four, standing the aramid fiber sizing net at the bottom of the aramid fiber paper pulp tank for a period of time, and quickly and uniformly lifting the aramid fiber sizing net upwards;
step five, performing dewatering and drying treatment on the prepared insulated aramid paper board;
and step six, curing the surface of the dried insulating aramid paper board.
The mesh of aramid fiber sizing net is the round hole, aramid fiber sizing net's all edges all around are equipped with the side flange, the height of side flange is 8-10mm, the unfixed connection between the bottom of side flange and the top edge of aramid fiber sizing net, can make aramid fiber pile up higher through the side flange, make aramid fiber paper shaping more easily, the space between side flange and the aramid fiber sizing net is favorable to the quick discharge of moisture and other liquid in the aramid fiber paper pulp.
The aramid fiber paper pulp comprises long aramid fibers and short aramid fibers, the content ratio of the long aramid fibers to the short aramid fibers is 3:1, the upper portion of the aramid fiber paper pulp groove is in an open shape, ultrasonic generators are arranged on the side walls of the two sides of the aramid fiber paper pulp groove in a staggered mode, and the aramid fibers with different lengths are used in a combined mode, so that the aramid fibers in the aramid fiber paper are connected more tightly, and the compactness of the aramid fiber paper board is better.
Stirring the aramid fiber pulp tank for 10s, stopping stirring the aramid fiber pulp, taking out the stirring paddle, enabling ultrasonic generators on the side walls of the two sides of the aramid fiber pulp tank to work, the aramid fiber paper pulp in the aramid fiber paper pulp tank is driven, the vibration frequency range of ultrasonic waves is 10KHz-11KHz, an ultrasonic generator is arranged on a support at the top of the aramid fiber paper pulp tank, all the ultrasonic generators on the aramid fiber paper pulp tank aim at the aramid fiber paper pulp tank to emit the ultrasonic waves, the ultrasonic generators are stopped after being started for 3s every time, the ultrasonic generators are started for three times, the interval between every two starts of the ultrasonic generators is 3s, through the ultrasonic wave vibrations to aramid fiber in the aramid fiber paper pulp, make aramid fiber can not receive the bottom that gravity action precipitated aramid fiber paper pulp, make aramid fiber paper pulp inside distribution even.
Aramid fiber sizing net stews in aramid fiber paper pulp tank bottom 10s, then aramid fiber sizing net shifts up rapidly, the speed that shifts up is 1cm/s, 3cm at every turn shifts up, shift up rapidly can make the inside more aramid fiber of aramid fiber paper pulp stay on aramid fiber sizing net, aramid fiber sizing net is when shifting up, aramid fiber paper pulp falls under the effect of gravity, make faster the falling of aramid fiber paper pulp on aramid fiber sizing net after realizing bidirectional acceleration.
The lifted aramid fiber sizing net stands for 10S right above the aramid fiber paper pulp groove, then the aramid fiber sizing net moves downwards for 10cm firstly, then moves upwards for 10cm rapidly, the upward moving speed is 5 times of the downward moving speed, the step S1 and the step S2 finish water removal, the inertia is utilized to separate the moisture inside the wet aramid fiber paper from the aramid fiber, meanwhile, the distance between the aramid fibers inside the aramid fiber paper board is reduced, and the compactness of the aramid fiber board is better.
The method comprises the steps that an insulated aramid fiber paper board after dewatering is taken down from an aramid fiber sizing net and then placed on the upper surface of a high-water-absorptivity sponge pad, an electric heating roller is adopted to move back and forth for rolling, the downward pressure of the electric heating roller on the insulated aramid fiber paper board in the moving process is gradually increased, the temperature of the electric heating roller is increased by 10 ℃ every time the temperature of the electric heating roller changes in one direction, secondary dewatering is completed through combination of extrusion and high temperature, the aramid fiber paper board subjected to secondary dewatering is placed in a high-temperature dehumidifier, the high-temperature dehumidifier applies pressure to the aramid fiber paper board, meanwhile, the table board of the high-temperature dehumidifier and a pressing plate applying pressure to the aramid fiber paper board from the upper side and the lower side increase the temperature to 250 ℃ from the normal temperature state, the heating process is divided into three stages of 150 ℃, 200 ℃ and 250 ℃, and the temperature is maintained for 10-15min under each temperature environment.
In the case of the example 1, the following examples are given,
meanwhile, the table top of the high-temperature dehumidifier and the pressure plate applying pressure to the upper part increase the temperature of the aramid fiber paper board from the upper direction and the lower direction, the temperature is increased to 250 ℃ from the normal temperature state, the heating process is divided into three stages of 130 ℃, 1800 ℃ and 250 ℃, and the temperature is maintained for 10min in each temperature environment.
In the case of the example 2, the following examples are given,
meanwhile, the table board of the high-temperature dehumidifier and the pressure plate applying pressure to the upper part increase the temperature of the aramid fiber paper board from the upper direction and the lower direction, the temperature is increased to 250 ℃ from the normal temperature state, the heating process is divided into three stages of 140 ℃, 190 ℃ and 250 ℃, and the temperature is maintained for 11min in each temperature environment.
In the case of the example 3, the following examples are given,
meanwhile, the table top of the high-temperature dehumidifier and the pressure plate applying pressure to the upper part increase the temperature of the aramid fiber paper board from the upper direction and the lower direction, the temperature is increased to 250 ℃ from the normal temperature state, the heating process is divided into three stages of 160 ℃, 210 ℃ and 250 ℃, and the temperature is maintained for 13min in each temperature environment.
In the case of the example 4, the following examples are given,
meanwhile, the table board of the high-temperature dehumidifier and the pressure plate applying pressure to the upper part increase the temperature of the aramid fiber paper board from the upper direction and the lower direction, the temperature is increased to 250 ℃ from the normal temperature state, the heating process is divided into three stages of 170 ℃, 220 ℃ and 250 ℃, and the temperature is maintained for 15min in each temperature environment.
According to the aramid fiber paper board, under the control ranges of different time and different temperatures, when the table board of the high-temperature dehumidifier and the pressure plate applying pressure on the table board increase the temperature of the aramid fiber paper board from the upper direction and the lower direction, the aramid fiber paper board is heated to 250 ℃ from a normal temperature state, the heating process is divided into three stages of 150 ℃, 200 ℃ and 250 ℃, and the quality of the produced aramid fiber paper board is the best when the aramid fiber paper board is maintained for 14min in each temperature environment.
Through the combination of the two methods of extruding water and evaporating water at high temperature, the discharge of water in the aramid fiber paper board can be greatly improved.
Injecting aramid fiber paper pulp into the upper surface and the lower surface of the dry aramid fiber paper board, placing the aramid fiber paper board with the surface wrapped with the aramid fiber paper pulp into a high-temperature dehumidifier for high-temperature and high-pressure surface curing treatment, placing the aramid fiber paper board subjected to high-temperature and high-pressure treatment into a low-temperature-100 ℃ cooling box for cooling for 10min, then placing the aramid fiber paper board into a high-temperature and high-pressure chamber for heating, uniformly distributing square holes on the surface of the final aramid fiber paper board, and enabling the aramid fiber paper pulp on the surface of the aramid fiber paper board and the dry aramid fiber paper board to be better cured.
The insulating aramid paper board adopts an immersion type preparation method, the preparation process is simple, the thickness of the aramid paper is convenient to control, and the prepared aramid paper is high in overall strength.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A preparation process of an immersion type insulating aramid fiber paperboard by utilizing inertia is characterized by comprising the following steps of: the method comprises the following steps:
firstly, preparing an aramid fiber sizing net;
step two, preparing aramid fiber paper pulp, namely placing the aramid fiber paper pulp in an aramid fiber paper pulp groove;
step three, uniformly stirring aramid fiber paper pulp by adopting a stirring paddle, placing a prepared aramid fiber sizing net at the bottom of an aramid fiber paper pulp tank, and continuously stirring the aramid fiber paper pulp for 10 s;
step four, standing the aramid fiber sizing net at the bottom of the aramid fiber paper pulp tank for a period of time, quickly lifting the aramid fiber sizing net upwards at a constant speed, standing the aramid fiber sizing net at the bottom of the aramid fiber paper pulp tank for 10s, quickly moving the aramid fiber sizing net upwards at a speed of 1cm/s, moving the aramid fiber sizing net upwards for 3cm each time, standing the lifted aramid fiber sizing net right above the aramid fiber paper pulp tank for 10s, firstly moving the aramid fiber sizing net downwards for 10cm, quickly moving the aramid fiber sizing net upwards for 10cm at a speed which is 5 times of the speed of moving the aramid fiber sizing net downwards, and repeating the step 4 for 5-7 times to complete water removal;
step five, performing dewatering and drying treatment on the prepared insulating aramid paper board, taking the dewatered insulating aramid paper board from an aramid fiber sizing net, placing the dewatered insulating aramid paper board on the upper surface of a high-water-absorptivity sponge pad, adopting an electric heating roller to move back and forth for rolling, gradually increasing the downward pressure of the electric heating roller on the insulating aramid paper board in the moving process, increasing the temperature of the electric heating roller by 10 ℃ every time the temperature of the electric heating roller changes one direction, finishing secondary dewatering, placing the secondarily dewatered aramid fiber paper board in a high-temperature dehumidifier, applying pressure to the aramid fiber paper board by the high-temperature dehumidifier, increasing the temperature of the aramid fiber paper board by a table top of the high-temperature dehumidifier and a pressure plate applying pressure above the table top from the upper direction and the lower direction, heating the aramid fiber paper board to 250 ℃ from a normal temperature state, and dividing the heating process into three stages of 150 ℃, 200 ℃ and 250 ℃, and maintaining the temperature for 10-15min in each temperature environment;
and step six, curing the surface of the dried insulating aramid fiber paper board, injecting aramid fiber paper pulp into the upper surface and the lower surface of the dried aramid fiber paper board, placing the aramid fiber paper board with the surface coated with the aramid fiber paper pulp into a high-temperature dehumidifier for high-temperature and high-pressure surface curing treatment, placing the aramid fiber paper board subjected to high-temperature and high-pressure treatment into a low-temperature-100 ℃ cooling box for cooling for 10min, then placing the aramid fiber paper board under high temperature and high pressure for heating, and finally uniformly distributing small square holes on the surface of the aramid fiber paper board.
2. The process for preparing the immersion type insulated aramid paper board by using inertia as claimed in claim 1, wherein: in the first step, the meshes of the aramid fiber sizing net are round holes, side retaining edges are arranged on the edges of the aramid fiber sizing net, the height of each side retaining edge is 8-10mm, and the bottom of each side retaining edge is not fixedly connected with the upper edge of the aramid fiber sizing net.
3. The process for preparing the immersion type insulated aramid paper board by using inertia as claimed in claim 1, wherein: the aramid fiber pulp prepared in the step II comprises long aramid fibers and short aramid fibers, the content ratio of the long aramid fibers to the short aramid fibers is 3:1, the upper part of the aramid fiber pulp tank is in an open shape, and ultrasonic generators are arranged on the side walls of two sides of the aramid fiber pulp tank in a staggered mode.
4. The process for preparing the immersion type insulated aramid paper board by using inertia as claimed in claim 1, wherein: and thirdly, stirring aramid fiber paper pulp after stirring for 10s in the aramid fiber paper pulp tank, taking out the stirring paddle, enabling ultrasonic generators on the side walls of the two sides of the aramid fiber paper pulp tank to work, driving aramid fibers in the aramid fiber paper pulp tank, enabling the vibration frequency of ultrasonic waves to be 10KHz, arranging ultrasonic generators on a support at the top of the aramid fiber paper pulp tank, enabling all ultrasonic generators on the aramid fiber paper pulp tank to aim at the aramid fiber paper pulp tank to emit ultrasonic waves, stopping the ultrasonic generators after starting for 3s every time, starting the ultrasonic generators for three times, and enabling the ultrasonic generators to be started for 3s every time.
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| GB462359A (en) * | 1935-09-04 | 1937-03-04 | Henry Steven Tenny | Improvements in the manufacture of moulded articles of paper and like felted materials |
| FR1376696A (en) * | 1963-09-16 | 1964-10-31 | Molded Container Corp | Method and apparatus for molding pulp articles |
| JPH09195200A (en) * | 1996-01-25 | 1997-07-29 | Noritake Co Ltd | Papermaking mold for pulp fiber molded form, molding for pulp fiber molded form, and pulp fiber molded form |
| JP2009239589A (en) * | 2008-03-27 | 2009-10-15 | Panasonic Corp | Loudspeaker diaphragm, loudspeaker using the same, and loudspeaker-diaphragm manufacturing method |
| CN103321103A (en) * | 2013-06-13 | 2013-09-25 | 华南理工大学 | Meta-position aramid fiber paper with high electrical insulativity as well as preparation method and application thereof |
| CN103485234A (en) * | 2013-10-22 | 2014-01-01 | 陕西科技大学 | Preparation method of mixed fiber system aramid paper |
| WO2015033697A1 (en) * | 2013-09-04 | 2015-03-12 | デュポン帝人アドバンスドペーパー株式会社 | Conductive aramid paper and method for producing same |
| CN113811377A (en) * | 2019-04-05 | 2021-12-17 | 奥斯龙-明士克公司 | Smoke filter medium |
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2022
- 2022-04-28 CN CN202210459049.8A patent/CN114703694A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB462359A (en) * | 1935-09-04 | 1937-03-04 | Henry Steven Tenny | Improvements in the manufacture of moulded articles of paper and like felted materials |
| FR1376696A (en) * | 1963-09-16 | 1964-10-31 | Molded Container Corp | Method and apparatus for molding pulp articles |
| JPH09195200A (en) * | 1996-01-25 | 1997-07-29 | Noritake Co Ltd | Papermaking mold for pulp fiber molded form, molding for pulp fiber molded form, and pulp fiber molded form |
| JP2009239589A (en) * | 2008-03-27 | 2009-10-15 | Panasonic Corp | Loudspeaker diaphragm, loudspeaker using the same, and loudspeaker-diaphragm manufacturing method |
| CN103321103A (en) * | 2013-06-13 | 2013-09-25 | 华南理工大学 | Meta-position aramid fiber paper with high electrical insulativity as well as preparation method and application thereof |
| WO2015033697A1 (en) * | 2013-09-04 | 2015-03-12 | デュポン帝人アドバンスドペーパー株式会社 | Conductive aramid paper and method for producing same |
| CN103485234A (en) * | 2013-10-22 | 2014-01-01 | 陕西科技大学 | Preparation method of mixed fiber system aramid paper |
| CN113811377A (en) * | 2019-04-05 | 2021-12-17 | 奥斯龙-明士克公司 | Smoke filter medium |
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