CN113502680A - Crepe paper manufacturing method based on speed difference creping - Google Patents
Crepe paper manufacturing method based on speed difference creping Download PDFInfo
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- CN113502680A CN113502680A CN202110890124.1A CN202110890124A CN113502680A CN 113502680 A CN113502680 A CN 113502680A CN 202110890124 A CN202110890124 A CN 202110890124A CN 113502680 A CN113502680 A CN 113502680A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 134
- 238000000034 method Methods 0.000 claims abstract description 40
- 230000008569 process Effects 0.000 claims abstract description 21
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 9
- 238000007605 air drying Methods 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 2
- 206010040954 Skin wrinkling Diseases 0.000 description 35
- 230000000694 effects Effects 0.000 description 25
- 239000004744 fabric Substances 0.000 description 12
- 238000012546 transfer Methods 0.000 description 12
- 238000003825 pressing Methods 0.000 description 10
- 239000000428 dust Substances 0.000 description 6
- 238000010409 ironing Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/08—Creasing
- B31F1/10—Creasing by rotary tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/12—Crêping
- B31F1/126—Crêping including making of the paper to be crêped
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
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Abstract
The invention relates to a crepe paper manufacturing method based on speed difference creping, which is characterized by comprising the following steps: the method comprises the following steps: s1 preparing the wet paper web: forming the pulp prepared in advance into a wet paper web by a forming part; s2 conveying: the formed wet paper web is conveyed to a drying cylinder through a net or a blanket for dehydration; s3 wrinkling: mutually extruding the wet paper web and the vacuum wrinkling roller through the vacuum wrinkling roller, adsorbing the paper web on the drying cylinder on the surface of the vacuum wrinkling roller, wherein the speed of the vacuum wrinkling roller is lower than that of the drying cylinder to generate speed difference, stacking and extruding wrinkling the wet paper web at the extruding position of the vacuum wrinkling roller and the drying cylinder, and performing primary drying and forming in the extruding and wrinkling process; s4, drying: after being absorbed by the vacuum wrinkling roller, the wrinkled paper web is sent into a drying device through a conveying part for drying and forming treatment. The invention has simple and high-efficiency mode for producing crepe paper, and the produced paper is loose, has good flexibility and has no scraps.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for manufacturing crepe paper based on speed difference creping.
Background
The general household paper is creped by adopting a traditional light dry creping process (LDC), and the process comprises the following steps:
the paper pulp in the paper pulp head box is formed into an initial paper web on paper making equipment such as a paper pulp jet fourdrinier paper machine and the like, and the initial paper web is transferred to the water absorption felt through a guide roller and is tightly attached to the surface of the water absorption felt for dehydration; then the wet paper sheet is pressed by a guide roller and a press roller and then transferred to the surface of a hot drying cylinder for drying; finally, the paper web is creped by the doctor blade against the surface of the paper web and by the strong impact with the paper web, which crepe increases the bulk and softness of the paper.
With the development of technology within the industry, the process for making crepe paper is increasingly optimized, such as a creping method disclosed in patent publication "CN 103286988A", entitled "creping device, creping method using the creping device, and creped paper" which forms a wet web of pulp and dewaters the web through a forming wire; then the paper web transferred from the forming machine net is further dewatered through a transfer part and achieves a primary wrinkling effect, the transfer part comprises a structural fabric, a plurality of guide rollers and a vacuum paper lifting box positioned at the contact position of the transfer part and the forming machine net, the paper web is squeezed between the structural fabric at the contact position of the forming machine net and the vacuum paper lifting box, the moving speed of the structural fabric is controlled to be smaller than that of the forming machine net, so that the wet paper web is stacked at the contact position of the forming machine net and the structural fabric to achieve the wrinkling effect, the wet paper web is dried through a drying cylinder after being subjected to primary wrinkling, and a scraper abuts against the surface of the drying cylinder at the moment to achieve wrinkling of the paper web.
However, there are several problems with this approach, which are as follows:
firstly, after primary wrinkling, the effect of recovering the wrinkled paper can be achieved after drying traction and drying, and the quality of the produced wrinkled paper is poor;
secondly, the blade causes defects in the web and causes a phenomenon of web breakage during the pressing in collision with the web surface;
thirdly, creping the dried paper web with a doctor blade leaves a lot of paper dust for a long time, which results in frequent cleaning or replacement of the doctor blade and dust generation, affecting the working environment of the workshop.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a crepe paper manufacturing method based on speed difference creping.
The technical scheme of the invention is realized as follows: a crepe paper manufacturing method based on speed difference creping is characterized in that: the method comprises the following steps:
s1 preparing the wet paper web: forming the pulp prepared in advance into a wet paper web by a forming part;
s2 conveying: the formed wet paper web is conveyed to a drying cylinder through a net or a blanket for dehydration;
s3 wrinkling: pressing the paper web on the drying cylinder to the surface of a vacuum wrinkling roller through mutual pressing of the vacuum wrinkling roller and the drying cylinder, wherein the speed of the vacuum wrinkling roller is lower than that of the drying cylinder to generate speed difference, the wet paper web is stacked and wrinkled at the pressing position of the vacuum wrinkling roller and the drying cylinder, and primary drying forming is carried out in the squeezing wrinkling process;
s4, drying: after being absorbed by the vacuum wrinkling roller, the wrinkled paper web is sent into a drying device through a conveying part for drying and forming treatment.
Preferably: the drying device in the step S4 is specifically configured to dry and form the paper web by through-air drying, and after the paper web is horizontally folded in a drying oven for multiple times by a plurality of transport rollers, the paper web is through-air dried by high-pressure hot air from bottom to top.
Preferably: and the high-pressure hot air enters the drying box in a rotational flow mode to carry out hot air penetration drying on the paper web.
Preferably: the vacuum wrinkling roller comprises an inner roller, an outer roller and a vacuum exhaust pipe, wherein the inner roller is arranged inside the outer roller and is coaxial with the outer roller; a sealed cavity is arranged between the inner roller and the outer roller; the outer roller is provided with a plurality of rows of uniformly distributed suction hole groups, and each suction hole group consists of a plurality of through holes with centers positioned on a straight line; and a vacuum suction pipe seat is installed at one section of the outer roller, and a vacuum suction pipe communicated with the sealed cavity is arranged in the vacuum suction pipe seat.
Preferably: the both ends of interior roller are provided with first axis of rotation, and the second axis of rotation is installed to the one end that interior roller was kept away from to first axis of rotation, and second axis of rotation diameter is less than first axis of rotation.
Preferably: the drying device comprises a drying box, a heater arranged on the drying box, an axial flow fan and a high-pressure pump; an air supply channel is arranged on the side wall of the drying box, and an air outlet channel is arranged at the top of the drying box; an air inlet pipe communicated with the inner cavity of the drying box is arranged at the bottom of the drying box; the output end of the air supply channel is communicated with the input port of the air inlet pipe through the high-pressure pump; the heater and the axial flow fan are both fixedly arranged in the air supply channel; a plurality of conveying roller sets for conveying paper sheets are sequentially and alternately arranged in the drying box from top to bottom at intervals; a traction wheel set is arranged outside the drying box; a blanket is sleeved on the transport roller combined traction wheel set to form a transport closed loop; and the drying box is provided with a conveying channel for the blanket and the paper to pass through.
Preferably: the air supply channel is provided with a heat recovery component; the heat recovery part comprises a heat exchange box, a plurality of exhaust pipes and a heat exchange access pipeline; the heat exchange box is fixedly arranged on the inner wall of the air supply channel, and one side of the heat exchange box is communicated with the air outlet channel at the top of the drying box through a heat exchange access pipeline; the exhaust pipes are sequentially arranged inside the heat exchange box at intervals from top to bottom in an alternating mode, two ends of each exhaust pipe extend outwards respectively, one end of each exhaust pipe penetrates into the heat exchange access pipeline, and the other end of each exhaust pipe penetrates through the side wall of one side, away from the heat exchange access pipeline, of the heat exchange box; the upper end of the heat exchange box is provided with an air inlet, and the lower end of the heat exchange box is provided with an air supply outlet communicated with the air supply channel.
Preferably: the output end of the high-pressure pump is tangentially communicated with the side wall of the air inlet pipe through a tangential connecting pipe, and hot air entering the air inlet pipe enters the drying box in a rotational flow mode.
Preferably: a Laval structure output pipe is arranged at the top of the drying box; the large-diameter end of the output pipe with the Laval structure is hermetically connected with the inside of the drying box; the small-diameter end of the output pipe of the Laval structure is communicated with the air outlet channel through an air outlet sleeve; and the outer wall of the output pipe with the Laval structure, the outer wall of the air outlet sleeve and the inner wall of the drying box form a closed space; a drainage fan is arranged on the outer wall of the drying box; the output end of the drainage fan is communicated with the closed space; and a tangential air inlet pipe which is communicated with the air outlet sleeve in a tangential manner and the output end of which is obliquely arranged upwards is arranged in the sealed space.
Preferably: the drying box is provided with a door opening; the door opening is hinged with a hinged door; and a temperature detector for detecting the temperature of hot air is arranged in the air supply channel below the heater.
Compared with the prior art, the invention has the following beneficial effects:
1. pressing the paper web on the drying cylinder to the surface of the vacuum creping roller through the mutual pressing of the vacuum creping roller and the drying cylinder, wherein the speed of the vacuum creping roller is lower than that of the drying cylinder to generate speed difference, and the wet paper web is stacked and pressed to be creped at the pressing part of the vacuum creping roller and the drying cylinder, and the process and the prior forming machine wire form the paper pulp into a wet paper web and dewater the paper web; then the paper web transferred from the forming machine net is further dewatered through a transfer part and achieves a primary wrinkling effect, the transfer part comprises a structural fabric, a plurality of guide rollers and a vacuum paper lifting box which is positioned at the contact part of the transfer part and the forming machine net, the paper web is squeezed between the forming machine net and the structural fabric at the vacuum paper lifting box, and the moving speed of the structural fabric is controlled to be smaller than that of the forming machine net, so that the wet paper web is stacked at the contact part of the forming machine net and the structural fabric to achieve the wrinkling effect, the wet paper web passes through a drying cylinder for drying after being subjected to the primary wrinkling, and a scraper is abutted against the surface of the drying cylinder at the moment, and compared with the mode of realizing the wrinkling of the paper web, the paper web has the following distinguishing technical effects with remarkable progress:
1. the utility model discloses a crepe paper preparation method, compared with the prior art, can directly be fashioned on the dryer, the tradition utilizes speed difference and extrusion's mode to compare on the shaping net, not only use speed difference and extruded mode to corrugate in the extrusion process, in the in-process that speed difference piles up and extrudes corrugate, the dryer can heat wet paper, heating, form the effect of hot ironing, ironing along with the extruded in-process, make paper directly reach the effect of one step of shaping, the effect of corrugating of this mode is better, and the paper after corrugating is difficult for scattering, the design effect obtains very big improvement;
2. compared with the prior art, the crepe paper preparation method disclosed by the application has the advantages that the paper towel achieves the purpose of shaping in the processes of speed difference stacking, extruding, hot ironing and wrinkling, so that wrinkling by a scraper is not needed any more, the wrinkling process of the scraper is omitted, the phenomenon that paper sheets are damaged due to scraping of the scraper on the paper sheets can be avoided, better strength is given to the paper sheets, and the use comfort of a user is improved;
3. compared with the prior art, in the wrinkling process, the preparation method of the crepe paper disclosed by the application has the advantages that dust and paper scraps caused by wrinkling of the scraper can be reduced after the wrinkling of the scraper is not needed; paper scraps and paper dust cannot be generated on the crepe paper, the quality of crepe is improved, and the crepe paper is better suitable for user experience; the working environment of the workshop can be improved; in addition, the working procedure is saved, and the efficiency and the cost are improved.
2. Conveying the wrinkled and formed paper sheets into a drying box, and performing penetrating type drying treatment from bottom to top by high-pressure hot air; the method can further dry the paper sheet passing through the drying cylinder to take away the residual water on the paper sheet, so that the crepe paper sheet becomes drier and softer, and the flattened crepe paper sheet can have fine fluctuation after being penetrated by hot air, thereby further improving the softness and the bulk degree of the paper sheet.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of the vacuum roll configuration;
FIG. 3 is a schematic structural view of a drying box;
FIG. 4 is a schematic view of a heat exchange box;
fig. 5 is a schematic diagram of an automatic control structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example 1
The invention discloses a crepe paper manufacturing method based on speed difference creping, which comprises the following steps:
s1 preparing the wet paper web: forming the pulp prepared in advance into a wet paper web by a forming part;
s2 conveying: the formed wet paper web is conveyed to a drying cylinder 2 through a blanket and is dewatered;
s3 wrinkling: through mutual extrusion between the vacuum creping roller 1 and the wet paper sheet on the drying cylinder 2, and the paper web on the drying cylinder 2 is absorbed on the surface of the vacuum creping roller 1, at the moment, the rotating speed of the vacuum creping roller 1 is lower than that of the drying cylinder 2 to generate speed difference, the wet paper web is stacked and extruded and creped at the extrusion part of the vacuum creping roller 1 and the drying cylinder 2, and primary drying and forming are carried out in the extrusion and creping process;
s4, drying: the creped web is sucked by the vacuum creping roll 1 and then fed through a transport section to a drying device 3 for drying and forming.
The transportation part consists of a plurality of driving rollers, a vacuum wrinkling roller and a felt of which the outer surface is provided with hydrophilic fiber bodies; the web, which also has some moisture after creping and setting, will stick to the felt for transfer.
In a specific embodiment of the present invention, the drying device 4 in step S4 is specifically configured to perform drying and forming on the paper web by through-air drying, and after the paper web is horizontally folded in a drying oven for multiple times by a plurality of transport rollers, the paper web is through-dried by high-pressure hot air in a swirling manner from bottom to top.
After a plurality of horizontal folding, the drying stroke of the paper web can be increased, and the drying effect of the paper web is improved.
In a specific embodiment of the invention, the high-pressure hot air enters the drying box in a rotational flow manner to carry out through-air drying on the paper web.
The paper sheets are upwards dried in a rotational flow mode through high-pressure hot air in a drying mode, the high-pressure hot air has a penetrating effect, the impact force can be improved in the rotational flow mode, the capacity of taking away moisture is improved, the drying effect of the paper sheets is improved, and the quality of the paper sheets is improved.
In addition, because in the paper manufacture process, can add a lot of lipid additives, the paper is getting into the in-process of drying at the stoving case, the additive can form steam absorption on stoving incasement wall after being evaporated, it is thick to lead to inside, and the paper wadding that the paper stoving produced can be glued on stoving incasement wall by this thick thing, and the inside wind of tangential entering can be with stoving incasement wall extrusion contact, the paper wadding that makes on the stoving incasement wall is cleared up by this tangential and stoving incasement wall extrusion contact's high-pressure hot-blast, it is clean to keep the stoving incasement wall, improve paper production quality.
Example 2, the difference from the example is:
as shown in fig. 1-2, in the present embodiment, the vacuum creping roller 1 comprises an inner roller 11, an outer roller 12 and a vacuum exhaust tube 13, the inner roller 11 is disposed inside the outer roller 12 and is disposed coaxially with the outer roller 12; a sealed cavity 14 is arranged between the inner roller 11 and the outer roller 12; a plurality of rows of uniformly distributed suction hole groups are arranged on the outer roller 12, and each suction hole group consists of a plurality of through holes with centers positioned on the same straight line; a vacuum suction pipe seat is arranged at one section of the outer roller 12, and a vacuum suction pipe 13 communicated with the sealed cavity is arranged in the vacuum suction pipe seat.
The vacuum suction pipe seat consists of a lantern ring and a fixing ring, wherein the lantern ring is sleeved on the vacuum exhaust pipe, and the fixing ring is sleeved on the lantern ring; the fixing ring is installed on the vacuum corrugated pipe through a bolt, so that the effect of stabilizing the vacuum suction pipe is achieved.
In the embodiment of the present invention, the two ends of the inner roller 11 are provided with first rotating shafts 111, one end of the first rotating shaft 111 far away from the inner roller 11 is provided with a second rotating shaft 112, and the diameter of the second rotating shaft 112 is smaller than that of the first rotating shaft 111.
The vacuum corrugating roller has the advantages of good adsorption effect, strong adsorption capacity, simple vacuum structure and lower cost.
Example 3, the difference from example 2 is:
as shown in fig. 3 to 5, in the embodiment of the present invention, the drying device 3 includes a drying box 31, a heater 32 disposed on the drying box 31, an axial flow fan 33, and a high pressure pump 34; an air supply channel 35 is arranged on the side wall of the drying box 31, and an air outlet channel 36 is arranged at the top of the drying box; an air inlet pipe 37 communicated with the inner cavity of the drying box 31 is arranged at the bottom of the drying box 31; the output end of the air supply channel 35 is communicated with the input port of an air inlet pipe 37 through the high-pressure pump 34; the heater 32 and the axial flow fan 33 are both fixedly installed in an air supply channel 35; a plurality of conveying roller sets for conveying paper sheets are sequentially and alternately arranged in the drying box 31 from top to bottom at intervals; a traction wheel set is arranged outside the drying box 31; a blanket is sleeved on the transport roller combined traction wheel set to form a transport closed loop; the drying box 31 is provided with a conveying channel for the blanket and the paper to pass through.
It should be further noted that, during specific use, an automatic control structure a for controlling the wind speed of the air supply channel 35 may be further disposed inside the air supply channel 35, the automatic control structure a mainly includes a positioning rod a1, the positioning rod a1 is fixedly connected to the inner wall of the drying box 31, a truncated cone is longitudinally slidably disposed on the positioning rod a1, a section of the small diameter of the truncated cone a2 faces the air supply channel 35, the truncated cone a2 enters the air supply channel 35 when being driven by an air cylinder to move longitudinally through a3, and the airflow gap of the air supply channel 35 can be changed in the process that the truncated cone a2 passes through the air supply channel 35, so as to change the flow rate, change the blowing force, achieve the purpose of changing the fluffy degree of paper, and meet the requirements of producing different papers.
In the present embodiment, the air supply passage 35 is provided with a heat recovery member 4; the heat recovery part 4 comprises a heat exchange box 41, a plurality of exhaust pipes 42 and a heat exchange access pipeline 43; the heat exchange box 41 is fixedly arranged on the inner wall of the air supply channel 35, and one side of the heat exchange box 41 is communicated with the air outlet channel 36 at the top of the drying box 31 through a heat exchange access pipeline 43; the exhaust pipes 42 are sequentially arranged inside the heat exchange box 41 at intervals from top to bottom in an alternating manner, and two ends of each exhaust pipe extend outwards respectively, wherein one end of each exhaust pipe penetrates into the heat exchange access pipeline 43, and the other end of each exhaust pipe penetrates through the side wall of one side, away from the heat exchange access pipeline 43, of the heat exchange box 41; the upper end of the heat exchange box 41 is provided with an air inlet, and the lower end of the heat exchange box 41 is provided with an air supply outlet communicated with the air supply channel 35.
It should be noted that: through being provided with such drying equipment, can carry out drying from bottom to top to the paper, take away the moisture in the page, improve the soft degree of page.
In addition, compared with the prior art, the top of the drying box is provided with a heat recovery component, when the drying operation is carried out, hot moisture generated by the drying materials can be discharged outwards by the heat exchange box in the waste heat recovery device, the hot moisture is discharged outwards along the exhaust pipe transversely arranged on the heat exchange box, at the moment, the axial flow fan in the air supply channel runs, outdoor air flow can be pumped into the heating cavity along a fresh air inlet on the heat exchange box for air flow supplement, the outdoor air flow passes through the inside of the heat exchange box and enters the air supply channel along a gap between adjacent exhaust pipes, in the process, the external fresh air can be in contact with the outer pipe wall of the exhaust pipe, the heat of the hot moisture in the exhaust pipe is absorbed, the moisture after temperature reduction is discharged from the exhaust pipe, the heat recovery effect is realized, heat energy is saved, and the drying efficiency is improved.
In the present embodiment, the output end of the high pressure pump 34 is tangentially communicated with the sidewall of the air inlet pipe 37 through the tangential connecting pipe 38, and the hot air entering the air inlet pipe 37 enters the inside of the drying box 31 in a swirling manner.
Compared with the prior art: through being provided with this tangential air inlet structure, the high-pressure hot-blast page that upwards weathers with the mode of whirl, and such mode, the mode of whirl can improve the impact force and improve the ability of taking away moisture to this stoving effect that improves the page improves the quality of page
In the specific embodiment of the present invention, the top of the drying box 31 is provided with a laval structure outlet pipe 5; the large-diameter end of the output pipe 5 with the Laval structure is hermetically connected with the inside of the drying box 31; the small-diameter end of the output pipe 5 with the Laval structure is communicated with the air outlet channel 36 through an air outlet sleeve 52; and the outer wall of the output pipe 5 with the Laval structure, the outer wall of the air outlet sleeve 52 and the inner wall of the drying box 31 form a closed space 6; a drainage fan 53 is arranged on the outer wall of the drying box 31; the output end of the drainage fan 53 is communicated with the closed space 6; a tangential air inlet pipe 54 which is tangentially communicated with the air outlet sleeve 52 and the output end of which is obliquely arranged upwards is arranged in the sealed space 6.
Compared with the prior art, through being provided with this Laval structure output tube, the gas that gets into Laval nozzle structure can accelerate the velocity of flow to produce a negative pressure in this region, consequently, hot-blast can be because the effect of this negative pressure upwards moves, improves hot-blast penetrability, in addition, still can avoid hot-blastly outwards running out along offering the transfer passage that supplies woollen blanket and paper page or leaf to pass on the stoving case.
In addition, the outer wall of the output pipe with the Laval structure, the outer wall of the air outlet sleeve and the inner wall of the drying box form a closed space; install drainage fan on the stoving incasement wall, drainage fan during operation can be to giving vent to anger the ascending tangential wind of intraductal input slope, makes the output tube output end of laval structure have this air current of an ascending air current can the stroke negative pressure always to this further ensures hot-blast upward movement, avoids the heat to run out along transfer passage, further stoving effect.
In the specific embodiment of the present invention, the drying box 31 is provided with a door opening; the door opening is hinged with a hinged door; a temperature detector 7 for detecting the temperature of hot air is arranged in the air supply channel 35 below the heater 32; the temperature detector 7 is externally connected with a controller 71 which can control the working states of the axial flow fan 33 and the heater 32, the temperature detector 7 transmits the detected temperature to the controller 71, and the controller 71 controls the axial flow fan 33 and the heater 32 according to the feedback data to ensure that the proper heat supply temperature can be improved.
Compared with the prior art, the invention has the following beneficial effects:
1. pressing the paper web on the drying cylinder to the surface of the vacuum creping roller through the mutual pressing of the vacuum creping roller and the drying cylinder, wherein the speed of the vacuum creping roller is lower than that of the drying cylinder to generate speed difference, and the wet paper web is stacked and pressed to be creped at the pressing part of the vacuum creping roller and the drying cylinder, and the process and the prior forming machine wire form the paper pulp into a wet paper web and dewater the paper web; then the paper web transferred from the forming machine net is further dewatered through a transfer part and achieves a primary wrinkling effect, the transfer part comprises a structural fabric, a plurality of guide rollers and a vacuum paper lifting box which is positioned at the contact part of the transfer part and the forming machine net, the paper web is squeezed between the forming machine net and the structural fabric at the vacuum paper lifting box, and the moving speed of the structural fabric is controlled to be smaller than that of the forming machine net, so that the wet paper web is stacked at the contact part of the forming machine net and the structural fabric to achieve the wrinkling effect, the wet paper web passes through a drying cylinder for drying after being subjected to the primary wrinkling, and a scraper is abutted against the surface of the drying cylinder at the moment, and compared with the mode of realizing the wrinkling of the paper web, the paper web has the following distinguishing technical effects with remarkable progress:
1. the utility model discloses a crepe paper preparation method, compared with the prior art, can directly be fashioned on the dryer, the tradition utilizes speed difference and extrusion's mode to compare on the shaping net, not only use speed difference and extruded mode to corrugate in the extrusion process, in the in-process that speed difference piles up and extrudes corrugate, the dryer can heat wet paper, heating, form the effect of hot ironing, ironing along with the extruded in-process, make paper directly reach the effect of one step of shaping, the effect of corrugating of this mode is better, and the paper after corrugating is difficult for scattering, the design effect obtains very big improvement;
2. compared with the prior art, the crepe paper preparation method disclosed by the application has the advantages that the paper towel achieves the purpose of shaping in the processes of speed difference stacking, extruding, hot ironing and wrinkling, so that wrinkling by a scraper is not needed any more, the wrinkling process of the scraper is omitted, the phenomenon that paper sheets are damaged due to scraping of the scraper on the paper sheets can be avoided, better strength is given to the paper sheets, and the use comfort of a user is improved;
3. compared with the prior art, in the wrinkling process, the preparation method of the crepe paper disclosed by the application has the advantages that dust and paper scraps caused by wrinkling of the scraper can be reduced after the wrinkling of the scraper is not needed; paper scraps and paper dust cannot be generated on the crepe paper, the quality of crepe is improved, and the crepe paper is better suitable for user experience; the working environment of the workshop can be improved; in addition, the working procedure is saved, and the efficiency and the cost are improved.
4. Conveying the wrinkled and formed paper sheets into a drying box, and performing penetrating type drying treatment from bottom to top by high-pressure hot air; the method can further dry the paper sheet passing through the drying cylinder to take away the residual water on the paper sheet, so that the crepe paper sheet becomes drier and softer, and the flattened crepe paper sheet can have fine fluctuation after being penetrated by hot air, thereby further improving the softness and the bulk degree of the paper sheet.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A crepe paper manufacturing method based on speed difference creping is characterized in that: the method comprises the following steps:
s1 preparing the wet paper web: forming the pulp prepared in advance into a wet paper web by a forming part;
s2 conveying: the formed wet paper web is conveyed to a drying cylinder through a net or a blanket for dehydration;
s3 wrinkling: the vacuum creping roll and the drying cylinder are mutually extruded, the speed of the vacuum creping roll is lower than that of the drying cylinder to generate speed difference, and the wet paper web is stacked and extruded to be creped at the extrusion part of the vacuum creping roll and the drying cylinder;
s4, drying: after being absorbed by the vacuum wrinkling roller, the wrinkled paper web is sent into a drying device through a conveying part for drying and forming treatment.
2. A method for manufacturing crepe paper based on differential speed creping according to claim 1, characterised in that: the drying device in step S4 is specifically configured to dry the paper web by through-air drying, and to through-air dry the paper web from bottom to top by high-pressure hot air.
3. A method for manufacturing crepe paper based on differential speed creping according to claim 2, characterised in that: and the high-pressure hot air enters the drying box in a rotational flow mode to carry out hot air penetration drying on the paper web.
4. A method for manufacturing crepe paper based on differential speed creping according to claim 3, characterised in that: the vacuum wrinkling roller comprises an inner roller, an outer roller and a vacuum exhaust pipe, wherein the inner roller is arranged inside the outer roller and is coaxial with the outer roller; a sealed cavity is arranged between the inner roller and the outer roller; a plurality of rows of uniformly distributed through holes are formed in the outer roller; and a vacuum suction pipe seat is installed at one section of the outer roller, and a vacuum suction pipe communicated with the sealed cavity is arranged in the vacuum suction pipe seat.
5. A method for manufacturing creped paper based on differential speed creping according to claim 4, characterised in that: the both ends of interior roller are provided with first axis of rotation, and the second axis of rotation is installed to the one end that interior roller was kept away from to first axis of rotation, and second axis of rotation diameter is less than first axis of rotation.
6. A crepe paper production process based on differential speed creping, according to claim 1 or 3, characterised in that: the drying device comprises a drying box, a heater arranged on the drying box, an axial flow fan and a high-pressure pump; an air supply channel is arranged on the side wall of the drying box, and an air outlet channel is arranged at the top of the drying box; an air inlet pipe communicated with the inner cavity of the drying box is arranged at the bottom of the drying box; the output end of the air supply channel is communicated with the input port of the air inlet pipe through the high-pressure pump; the heater and the axial flow fan are both fixedly arranged in the air supply channel; a plurality of conveying roller sets for conveying paper sheets are sequentially and alternately arranged in the drying box from top to bottom at intervals; a traction wheel set is arranged outside the drying box; a blanket is sleeved on the transport roller combined traction wheel set to form a transport closed loop; and the drying box is provided with a conveying channel for the blanket and the paper to pass through.
7. The crepe paper making process based on differential speed creping of claim 6 wherein: the air supply channel is provided with a heat recovery component; the heat recovery part comprises a heat exchange box, a plurality of exhaust pipes and a heat exchange access pipeline; the heat exchange box is fixedly arranged on the inner wall of the air supply channel, and one side of the heat exchange box is communicated with the air outlet channel at the top of the drying box through a heat exchange access pipeline; the exhaust pipes are sequentially arranged inside the heat exchange box at intervals from top to bottom in an alternating mode, two ends of each exhaust pipe extend outwards respectively, one end of each exhaust pipe penetrates into the heat exchange access pipeline, and the other end of each exhaust pipe penetrates through the side wall of one side, away from the heat exchange access pipeline, of the heat exchange box; the upper end of the heat exchange box is provided with an air inlet, and the lower end of the heat exchange box is provided with an air supply outlet communicated with the air supply channel.
8. The crepe paper making process based on differential speed creping of claim 7 wherein: the output end of the high-pressure pump is tangentially communicated with the side wall of the air inlet pipe through a tangential connecting pipe, and hot air entering the air inlet pipe enters the drying box in a rotational flow mode.
9. A crepe paper production process based on differential speed creping according to claim 7 or 8 characterised in that: a Laval structure output pipe is arranged at the top of the drying box; the large-diameter end of the output pipe with the Laval structure is hermetically connected with the inside of the drying box; the small-diameter end of the output pipe of the Laval structure is communicated with the air outlet channel through an air outlet sleeve; and the outer wall of the output pipe with the Laval structure, the outer wall of the air outlet sleeve and the inner wall of the drying box form a closed space; a drainage fan is arranged on the outer wall of the drying box; the output end of the drainage fan is communicated with the closed space; and a tangential air inlet pipe which is communicated with the air outlet sleeve in a tangential manner and the output end of which is obliquely arranged upwards is arranged in the sealed space.
10. A method of manufacturing creped paper based on differential speed creping according to claim 9, characterised in that: the drying box is provided with a door opening; the door opening is hinged with a hinged door; and a temperature detector for detecting the temperature of hot air is arranged in the air supply channel below the heater.
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