CN112458796B - Release paper manufacturing process and release paper produced by same - Google Patents

Release paper manufacturing process and release paper produced by same Download PDF

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Publication number
CN112458796B
CN112458796B CN202110069607.5A CN202110069607A CN112458796B CN 112458796 B CN112458796 B CN 112458796B CN 202110069607 A CN202110069607 A CN 202110069607A CN 112458796 B CN112458796 B CN 112458796B
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paper
glue
layer
coating
silicone oil
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CN112458796A (en
Inventor
穆范飞
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Foshan Xinfei Sanitary Materials Co ltd
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Foshan Xinfei Sanitary Materials Co ltd
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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/001—Release paper
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/32—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

The invention discloses a release paper manufacturing process and release paper produced by the same. In the manufacturing process of the release paper, coating is carried out twice on the smooth surface of the paper material to form an adhesive layer and a release agent layer in sequence, then back coating is carried out on the rough surface of the paper material to form an anti-rolling layer, process layout is carried out according to the characteristics of the paper material, glue, silicon oil and the anti-rolling glue in the manufacturing process, and coating and drying processes are designed reasonably, so that the overall thickness of the release paper is thinner, the gram weight is smaller, the coating is more uniform, the surface of the release paper is smoother, the toughness is stronger, and the release force is more stable and smaller; the anti-rolling layer is formed by back coating on the rough surface, and non-contact humidification is performed, so that the toughness of the release paper is enhanced, and the phenomenon of edge rolling and edge curling of the release paper is prevented.

Description

Release paper manufacturing process and release paper produced by same
Technical Field
The invention relates to the technical field of release paper manufacturing, in particular to a release paper manufacturing process and release paper produced by the same.
Background
In the prior art, the equipment of production from type paper is usually through applying the release agent behind the rubberizing and form from type paper after drying, the common setting mode corresponds a product for a production line in the production facility setting, often need another production line to produce if need switch over another kind of product, the production flexibility ratio is not high, the equipment that needs to settle is more, secondly the rubberizing or go up inhomogeneous then produce great influence to the performance from type paper in the silicon process, the type paper after the stoving is more fragile, be not convenient for back process processing and final client to use, once more, rubberizing usually, go up silicon, back coating divides 3 processes to accomplish, greatly increased manufacturing cost, unit production efficiency has been reduced again, be difficult to form the competitive advantage.
In order to solve the technical problems, the applicant has previously developed a release paper and a device and a process for producing the release paper, and specifically discloses a sizing device comprising a first sizing device and a second sizing device which are connected with each other and can be switched to each other for sizing, wherein the silicone oil feeding device comprises a first silicone oil feeding device and a second silicone oil feeding device, the first silicone oil feeding device and the second silicone oil feeding device are connected with each other and can be switched to each other, the second silicone oil feeding device is connected with and arranged on one side of the first silicone oil feeding device, and the two sizing devices and the two silicone oil feeding devices are arranged so as to be convenient for switching between different base coatings and different silicone oil varieties, so that the production flexibility is high, the resource utilization rate is high, and the surface sizing of paper materials is well leveled by performing glue scraping and leveling treatment after the sizing by the sizing devices, so that the smoothness effect of the surface sizing of the paper materials is good and the sizing is uniform; secondly, after finishing the silicone oil feeding, drying and then carrying out rewetting treatment to soften the paper material, thereby ensuring the smoothness of the paper material. The specific technical scheme refers to the patent application numbers as follows: 201910065536.4, and the technical scheme has the following problems in the actual manufacturing process of release paper:
1) The coating of the release paper with ultra-low gram weight can not be realized. The ultra-low gram weight release base paper has various parameters such as gram weight, water content, thickness, tightness and the like, and when the ultra-low gram weight release base paper is coated, the paper is not stable in transverse and longitudinal tension in the processes of glue layer coating and silicon layer coating, the paper is wrinkled and broken, the paper glue layer and the silicon layer are not uniformly covered, the peeling force of a final product is not stable, and the like.
2) When the release paper is rolled, because the back surface is a rough surface, the shrinkage of the coated surface is different from that of the non-coated surface, the water content of the paper and the tension of the coated surface and the non-coated surface are different, the phenomena of edge curling and the like are easy to occur, when the release paper with ultra-low gram weight is produced, the problem of direct fracture occurs, and continuous production cannot be realized.
3) The thickness of the glue layer formed by gluing the paper material is uneven, so that the coverage and the surface smoothness of the glue layer of the release paper have great difference, and the silicon coating in the post process is not facilitated.
4) The release agent layer on the release paper is not matched with the silicon loading process and the drying process of the silicone oil, so that the smoothness of the release paper is poor, the toughness of the release paper is insufficient, and the stripping force is unstable.
5) The mode of rewetting of paper is comparatively traditional, because of traditional contact moisturizing mode can take place the friction with the paper surface, and the rewetting effect is inhomogeneous, and the rewetting volume is difficult to guarantee, finally causes the rolling scroll unevenness easily, causes very big negative effects to the finished product quality of paper, finally leads to the finished product qualification rate to descend.
Therefore, the manufacturing process of the release paper needs to be optimized and improved aiming at the problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a release paper manufacturing process and release paper produced by the same.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a process for manufacturing release paper comprises the following steps:
s1, selecting materials, wherein the gram weight is 27-28gsm, the water content is 5-7%, the thickness is 35-50 mu m, and the tightness is 0.73-0.9g/m 3 The paper material of the thin page comprises a smooth surface and a rough surface which are oppositely arranged, is unreeled through unreeling equipment and unreeled to gluing equipment for gluing;
s2, priming coating, namely unreeling the paper material to a sizing device through unreeling equipment for sizing, coating a layer of glue on the smooth surface of the paper material by the sizing device, wherein the coating amount of the glue is obviously increased, the coverage of the glue after the glue coating is obviously improved, and a foundation is laid for silicon coating;
s3, drying glue, namely after the paper is glued by a gluing device, transmitting the paper to a glue drying device for drying at an ultrashort distance to form a glue layer on the smooth surface of the paper, and drying and flattening the surface of the paper to ensure that the paper is not deformed, so that the problems that the paper is wrinkled and cannot be further coated after serious wet swelling after moisture absorption, which are caused by the increase of the glue coating weight and the very high glue absorption speed of the ultralow-gram-weight release paper, are solved;
s4, a release agent layer, namely conveying the paper material forming the glue layer to a silicone oil feeding device for silicone oil feeding operation, and coating a layer of silicone oil on the glue layer by the silicone oil feeding device;
s5, drying silicone oil, namely, after the silicone oil is completely coated on the paper material by the silicone oil coating equipment, transmitting the paper material to the silicone oil drying equipment for drying so as to form a release agent layer on the glue layer of the paper material;
s6, back coating, namely conveying the paper material with the release agent layer to back coating equipment for back coating, and coating a layer of anti-rolling glue on the rough surface of the paper material by the back coating equipment;
s7, drying glue, namely after the paper is subjected to back coating by back coating equipment, conveying the paper to a back coating drying oven to perform drying operation, and forming an anti-rolling layer on the rough surface of the paper;
s8, water replenishing and rewetting, namely performing non-contact water replenishing and rewetting on the paper forming the anti-rolling layer;
s9, winding the paper material forming the anti-winding layer by winding equipment;
s10, the control mode of the tension of the whole machine and the winding tension is optimized, and the winding requirement of the double-sided silicon release paper under low tension is met after optimization.
In the present invention, the grammage tolerance of the paper is 0.4-0.9gsm.
In the invention, the smoothness of the glossy surface of the paper is 52.4-426.2S, the smoothness of the rough surface of the paper is 13.5-1.6.3S, the transverse tensile strength of the paper is 1.1-2.1KN/m, and the vertical tensile strength of the paper is 2.2-4.2 KN/m.
In the invention, the glue in the step S2 is PVA glue, the viscosity of the glue is 140-380CPS, the glue dry weight is 1.0gsm, the solid content is 7-9%, and the pH value is 5.78.
In the invention, the glue in the step S2 is latex, the viscosity of the glue is 38CPS, the glue dry weight is 1gsm, the solid content is 13.8-17.8%, and the pH value is 7.23.
In the invention, the silicone oil in the step S4 is solvent-free silicone oil, the coating weight of the silicone oil is 0.5gsm-0.9gsm, the solid content is 100%, and the viscosity is 140-250CPS.
In the invention, the anti-rolling glue in the step S6 is PVA glue, the gluing dry quantity of the anti-rolling glue is 0.1-0.2gsm, the solid content is 1-3%, and the viscosity is 4.7CPS.
In the invention, the drying temperature of the silicone oil in the step S5 is 150-180 ℃, and the drying time is 4S.
In the invention, the drying temperature of the anti-rolling glue in the step S7 is 60-70 ℃.
The release paper comprises paper materials, an adhesive layer arranged on a smooth surface of the paper materials, a release agent layer arranged on the adhesive layer, and an anti-rolling layer arranged on a rough surface of the paper materials.
The invention has the beneficial effects that: the glue layer and the parting agent layer are sequentially formed by coating twice on the smooth surface of paper material in the manufacturing process of the parting paper, then back coating is carried out on the rough surface of the paper material to form the anti-rolling layer, process layout is carried out according to the characteristics of the paper material, glue, silicon oil and the anti-rolling glue in the manufacturing process, coating and drying processes are reasonably designed, the overall thickness of the parting paper is thinner and more uniform, the surface of the parting paper is smoother, the toughness is strong, the anti-rolling layer is formed by back coating on the rough surface, non-contact humidification is carried out, such as steam humidification or centrifugal humidification, the toughness of the parting paper is enhanced, the rewetting effect is more uniform, the paper surface is prevented from being damaged, and the phenomenon that the edge of the parting paper is rolled up and turned over edge is caused is avoided.
Drawings
Fig. 1 is a schematic process flow diagram of the present embodiment.
Fig. 2 is a schematic structural view of the release paper of the present embodiment.
Wherein: paper material 1, adhesive layer 11, parting agent layer 12 and anti-rolling layer 13.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings and related embodiments, wherein the following related embodiments are merely preferred embodiments for better illustrating the present invention itself, and the embodiments of the present invention are not limited to the following embodiments, and the present invention relates to the related essential parts in the technical field, which should be regarded as the known technology in the technical field and can be known and grasped by those skilled in the art.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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.
As shown in FIG. 1, the invention discloses a process for manufacturing release paper, which comprises the following steps:
s1, selecting materials, wherein the gram weight is 27-28gsm, the gram weight tolerance of the paper material 1 is 0.4-0.9gsm, the water content is 5% -7%, the thickness is 35-50 mu m, and the tightness is 0.73-0.9g/m 3 The paper material 1 of the thin page comprises a smooth surface and a rough surface which are oppositely arranged, the paper material 1 is unreeled through unreeling equipment and unreeled to gluing equipment for gluing;
s2, priming, namely unreeling the paper material 1 to a sizing device through unreeling equipment for sizing, and coating a layer of glue on the smooth surface of the paper material 1 by the sizing device;
s3, drying glue, namely after the gluing equipment 3 finishes gluing the paper material 1, transmitting the paper material to glue drying equipment in an ultrashort distance for drying, so that a glue layer 11 is formed on the polished surface of the paper material 1;
s4, a release agent layer, namely conveying the paper material 1 forming the glue layer 11 to a silicone oil feeding device for silicone oil feeding operation, and coating a layer of silicone oil on the glue layer 11 by the silicone oil feeding device;
s5, drying the silicone oil, namely conveying the paper material 1 to a silicone oil drying device for drying operation after the silicone oil is completely applied to the paper material 1 by the silicone oil applying device, so that a release agent layer 12 is formed on an adhesive layer 11 of the paper material 1;
s6, back coating, namely conveying the paper material 1 with the release agent layer 12 to back coating equipment for back coating, and coating a layer of anti-rolling glue on the rough surface of the paper material 1 by the back coating equipment;
s7, glue is dried, and after the paper material 1 is subjected to back coating by back coating equipment, the paper material 1 is conveyed to a back coating drying oven to be dried, so that an anti-rolling layer 13 is formed on the rough surface of the paper material 1;
s8, water replenishing and rewetting, namely performing non-contact water replenishing and rewetting on the paper 1 forming the anti-rolling layer 13;
s9, winding the paper material 1 forming the anti-winding layer 13 by using winding equipment;
and S10, packaging the outer layer of the paper roll by adopting a stretching film on equipment after rolling.
The finished release paper after the steps of S1-S10 is finished can be subjected to the steps of S1-S7 and S9 on the non-silicon-coated surface, so that double-sided release paper is formed, and more use and processing requirements can be met.
Meanwhile, in order to be matched with a release paper manufacturing process for implementation, the applicant also develops release paper manufacturing equipment matched with the manufacturing process, and the release paper manufacturing equipment comprises unwinding equipment, gluing equipment, glue drying equipment, silicone oil feeding equipment, silicone oil drying equipment, a back coating oven and a steam humidifying equipment or centrifugal humidifying equipment, wherein the unwinding equipment, the gluing equipment, the silicone oil drying equipment, the silicone oil feeding equipment, the silicone oil drying equipment, the back coating equipment and the back coating equipment are sequentially arranged according to the release paper manufacturing process, the silicone oil feeding equipment is connected with the unwinding equipment and is used for gluing the smooth surface of paper 1, the silicone oil feeding equipment is connected with the gluing equipment and is used for heating and drying the glued paper 1, the back coating equipment is connected with the silicone oil drying equipment and is used for feeding silicone oil to the dried paper 1, the back coating oven is connected with the back coating oven and is used for supplementing water and rewetting the paper 1, and the winding equipment.
When the step S1 is implemented, the unreeling device comprises a placing rack and a paper guiding cutting knife, the unreeling device adopts double-station full-automatic non-stop unreeling device, and in the process of unreeling the paper material 1 to the gluing device, the unreeling traction device, the dust removal device and the process correction device which are sequentially arranged are further arranged, so that the paper material 1 enters the gluing device to be glued in a normal mode, and the normal operation of a production line is guaranteed.
When step S2 is implemented, the sizing device includes a traction device, so that paper material 1 is sized by the sizing anilox roller and the sizing silicon press roller, the sizing device is suitable for white latex or PVA glue, and after sizing is completed, the paper material is sent to a glue drying device for baking.
The online glue amount detection equipment is arranged between the gluing equipment and the glue drying equipment, so that the gluing amount is monitored in real time, the abnormity of the gluing process is conveniently adjusted and alarmed at any time, the gluing process of the equipment is stable and controlled, and the gluing quality of release paper is improved. In the transmission process, the paper material 1 can be compensated in real time according to the fluctuation condition in the transmission process through the tension roller, so that the tension is stable when gluing is kept, and the fluctuation of gluing amount caused by the fluctuation of the tension is avoided. In this embodiment, the tension roller preferably applies a tension of 200N, and paper 1 enters a drying device for drying after being glued.
When the step S3 is implemented, in this embodiment, the glue drying device should include 5 glue drying box assemblies that are relatively independent and connected in series, such as the first glue drying oven, the second glue drying oven, the third glue drying oven, the fourth glue drying oven, and the fifth glue drying oven, which are sequentially arranged, the glue drying device is an air floating drying oven, and the paper material 1 is dried in the air floating drying oven to form the glue layer 11.
In the glue drying box assembly, the temperature of a first glue drying oven is 55-65 ℃, the temperature of a second glue drying oven is 55-65 ℃, the temperature of a third glue drying oven is 60-70 ℃, the temperature of a fourth glue drying oven is 60-70 ℃, the temperature of a fifth glue drying oven is 55-65 ℃, and the temperatures are paper surface temperatures.
After the glue is coated, the paper must enter a glue oven for drying immediately, otherwise, moisture in the glue permeates into the paper, so that fibers in the paper absorb water to expand and deform, and finally, the paper is seriously deformed after being dried in the glue oven, and the silicon coating in the subsequent procedure cannot be carried out, so that the product is scrapped. Therefore, the length of a paper path between the paper gluing head and the inlet of the gluing oven is required to be short enough, and the ultra-short distance is preferably controlled within 1 meter.
When step S4 is implemented, in this embodiment, a deviation correcting mechanism, a tension isolating mechanism, and a cooling mechanism are disposed between the glue drying device and the silicone oil applying device, the dried paper material 1 sequentially passes through the above mechanisms and then enters the silicone oil applying device to perform a silicone oil applying operation, the silicone oil applying device includes a glue homogenizing roller, a metering roller, a first transfer roller, a second transfer roller, a coating roller, and a silicone pressure roller, which are sequentially arranged in a butting manner, according to the material advancing sequence, and the paper passes through a nip between the coating roller and the silicone pressure roller to achieve silicon applying. Displacement sensors and pressure sensors are arranged among the glue homogenizing roller, the metering roller, the first transfer roller, the second transfer roller, the coating roller and the silicon pressing roller, gaps among the rollers are monitored and automatically fed and compensated by the displacement sensors and the pressure sensors, the stability of the oil pressure of a hydraulic system of a coating head is guaranteed on the basis, a plurality of oil pressure stabilizing devices are preferably arranged, and the final coating uniformity and the coating amount stability are guaranteed through the foolproof control facilities for the gaps among the coating rollers. The final coating amount of the silicone oil is adjusted and controlled by the differential speed between the rollers of the coating machine.
According to the process, the paper material 1 subjected to coating processing is non-overpressure ultralow-gram-weight release base paper-27 gsm with the thinnest gram weight in the current domestic and foreign markets, but the low-gram-weight release paper in a non-overpressure state has lower tightness than the release paper in an overpressure state under the same gram weight, is easier to coat and permeate, the paper tightness of the raw material paper material is 0.7g/m through the tree, the paper thickness is 0.03mm, the paper tightness of the same-gram-weight release paper is more than 0.9g/m through the tree under the overpressure state, the paper thickness is more than 0.04, and the whole structure is more fragile, so that the problems of curling, flanging, crumpling, paper breaking and the like caused by too fast water loss frequently exist in the coating process due to the fact that the whole structure is more fragile.
In addition, the low-gram-weight release base paper has the problem of low smoothness, the general smoothness is 52.4s, the smoothness of the equivalent-grade overpressure release paper reaches more than 600s, if the low silicon coating amount is realized on the basis, the glue coating amount is increased in the glue coating process to improve the smoothness of the glue coated adhesive paper before silicon coating, but the technical problem of severe water swelling of the ultra-low-gram-weight release paper after large glue coating is solved if the glue coating amount is increased to improve the smoothness of the glue coated paper after the glue coating of the ultra-low-gram-weight release paper.
In summary, the existing release paper manufacturing process wants to quickly and high-quality produce the release paper product with ultra-low gram weight, which has great difficulty, even if the related process can solve the problem of damage of the release paper raw material with ultra-low gram weight in the production process, the qualification rate of the finished product is very low, and even mass production cannot be realized. However, the ultra-low gram weight release paper product has very wide application space and market demand in reality, so a key process for processing the raw material is urgently needed.
Therefore, the optimal technological parameters of the paper path length, the baking temperature of the oven and the air intake are required to be found, so that the paper is ensured to be quickly dried in a low-temperature and high-air-volume state, and the swelling time is reduced; the glue formula with the maximum solid content under the condition of meeting the gluing and leveling conditions is found, and the water feeding amount during gluing is reduced, so that the influence of moisture wetting and swelling is reduced.
In the invention, through a large number of process test verifications and technical scheme argumentations, baking process parameters after gluing, a gluing glue formula and a paper path input amount after gluing are optimized, and finally, the process aims of ultra-low gram weight release paper and large gluing amount coating are achieved.
When step S5 is implemented, the silicone oil drying device should include 5 groups of relatively independent and serially connected silicone oil drying box assemblies, such as a first silicone drying box, a second silicone drying box, a third silicone drying box, a fourth silicone drying box, and a fifth silicone drying box, which are sequentially arranged, the silicone oil drying device is also an air flotation drying box, and after the paper material 1 passes through the silicone drying box and is dried, the release agent layer 12 is formed.
In the silicon box drying component, the temperature of a first silicon oven is 140-150 ℃, the temperature of a second silicon oven is 160-170 ℃, the temperature of a third silicon oven is 160-170 ℃, the temperature of a fourth silicon oven is 160-170 ℃, the temperature of a fifth silicon oven is 130-140 ℃, and the temperatures are paper surface temperatures.
And then, sequentially implementing the steps S6 and S7, drying the paper 1 by a silicon oil drying device to form a parting agent layer 12, correcting the paper by a correcting mechanism, adjusting the tension of the paper by a vacuum adsorption roller, back-coating the paper in a back-coating mechanism, and drying the paper in a back-coating oven after the back-coating is finished.
Before this, single-side coating curling of paper has been a difficult problem in the paper industry, and is mainly caused by 2 reasons, namely curling caused by large difference of moisture between a coated side and a non-coated side on one hand, and curling caused by surface tension difference between the coated side and the non-coated side on the other hand, for a release paper raw material with ultra-low gram weight, the 2 points have more obvious influence, and curling is more serious, and is the most critical factor for realizing the process.
The common gram weight paper is treated in a way that roller type water replenishing and humidifying are generally carried out on the paper, so that the moisture difference of the upper surface and the lower surface of the edge of the paper is ensured to be small, and the curling caused by the moisture difference of the upper surface and the lower surface is balanced; however, the roll humidification can only alleviate the curling due to the 2-surface moisture difference, cannot completely balance the curling due to the 2-surface moisture difference, and further cannot balance the curling due to the surface tension difference caused by the fact that the coated surface is larger than the non-coated surface due to the addition of the glue layer.
The coating problem of the paper with the ultra-low gram weight is solved, and 2 reasons for paper curling are treated at one time: the process is characterized in that a back coating process of S6 is added after the paper material 1 is taken out of a silicon drying box, wherein the back coating liquid is thin glue with low solid content, so that the water difference of 2 surfaces of the paper material can be balanced, and the tension difference of 2 surfaces is balanced by coating a back coating anti-rolling glue layer on a non-coating surface. After the process is improved, the problem of paper edge warping of the single-side coated ultra-low gram weight paper is greatly improved, and the paper is not easy to damage in subsequent processing.
After being dried in a back coating oven, the paper material 1 enters cooling equipment for cooling, after being cooled, the paper material 1 enters steam humidifying equipment or centrifugal humidifying equipment for rewetting, after rewetting, the paper material 1 is cooled again, and after cooling, the paper material 1 is finally wound.
After the silicone oil equipment in the step S7 is dried, the paper material 1 becomes brittle, the coating surface is severely curled, and the paper material is easy to wrinkle, turn over and break in the operation process, after back coating, the paper material 1 is softened, the paper humidity is recovered to be normal, the tension difference between the coating surface and the non-coating surface is balanced, the performances of the paper 1 such as flatness and brittleness are greatly improved, and after the paper 1 is back coated, the problems of the paper surface flatness and the turn-up wrinkling are greatly relieved, but the requirements of final products are not met.
In order to ensure the quality of the final product, step S8 is performed, after paper 1 is dried by a back coating oven, the paper enters a cooling device for cooling, and after cooling, the paper needs to be secondarily rewetted by a non-contact steam rewetting cabinet or a centrifugal humidifying device, so that the flatness of the paper is further improved, the moisture content of the paper is improved, and the final winding quality of the release paper meets the requirement when step S9 is performed.
Because the water replenishing of the paper cannot be completed by 1 time, a small amount of water replenishing is needed for multiple times, so that the humidity of the paper can be recovered to the level before the base paper is coated, in particular to the ultra-low gram weight paper applied by the invention, a non-contact water replenishing humidifying process is added on the basis of the back coating water replenishing of the invention, and the process comprises 2 different small processes: centrifugal humidification or steam rewetting.
In the centrifugal humidifying process, the pressure of compressed air is required to be more than 4kg, and atomized water particles are required to be less than 5 um; in the steam rewetting process, the steam pressure must reach more than 3.5kg, the paper temperature must be about 35 ℃ before steam rewetting, the length of the steam rewetting box must not be lower than 1.5 meters, and the steam temperature must not be lower than 130 ℃.
In the invention, any one of the 2 processing procedures is selected, so that the rolling moisture content of the paper reaches 8 +/-0.5% after the paper is rewetted, therefore, due to the adoption of a non-contact humidifying mode, the paper surface is prevented from being impacted, the probability of impact damage of the paper is reduced to 0, and the paper is restored to the due surface flatness and softness through the rewetting procedure, so that the use effect in the post-procedure of the paper is finally ensured.
The driving speed of the production equipment for producing the release paper is set to be 500m/min, and the performance parameters of the release paper are as follows: the coating weight of the dry silicon is 0.5-0.9g/m < 2 >, the normal temperature peel force is 0.08-0.180N/25mm, the peel force is less than 0.6N/25 mm after aging for 20 hr at 70 ℃, the residual adhesion rate is more than 90%, air floating type drying ovens are adopted in the drying ovens, and the paper 1 is suspended and dried in the ovens without contacting with an oven body.
In the present invention, smoothness of the smooth surface of paper 1 is 52.4-426.2S, preferably 171.8S, smoothness of the matte surface of paper 1 is 13.5-1.6.3S, preferably 53.7S, transverse tensile strength of paper 1 is 1.1-2.1KN/m, preferably 1.7 KN/m, vertical tensile strength of paper 1 is 2.2-4.2 KN/m, preferably 3.1 KN/m, and sizing degree is 18.92-26.8, and by optimizing and limiting various parameters of paper 1, the adhesion degree of glue layer 11, release agent layer 12 and anti-curl layer 13 on paper 1 is higher, and the formed release paper is thinner, flatter in surface, better in gloss and more stable in peeling force.
As a preferred embodiment, the glue in the step S2 is PVA glue, the viscosity of the glue is 140-380CPS, preferably 264 CPS, the dry weight of the glue is 1.0gsm, the solid content is 8.7%, and the pH value is 5.78.
As a preferred embodiment, the glue in step S2 is latex, and has viscosity of 38CPS, glue dry weight of 1.0gsm, solid content of 13.8% -17.8%, preferably 15.3%, and pH of 7.23.
Because the traditional process has the defects of uneven sizing, difficult leveling, too large sizing amount and severe wetting expansion during sizing and drying, the volume of the glue layer 11 is obviously increased due to expansion and contraction of heat, and the volume is reduced and wound after cooling, the paper material 1 of the selected material needs to be subjected to corresponding sizing glue formula and relevant parameter adjustment of the sizing amount, so that the paper material 1 can meet the process requirements after being glued to form the glue layer 11, the smoothness of the paper material 1 is higher, the coverage after gluing is better, silicone oil is not easy to permeate and is easy to cover during silicon coating, the peel force performance of the final product is more stable, and the peel force is smaller.
As a preferable embodiment, the silicone oil in step S4 is solvent-free silicone oil, and the coating weight of the silicone oil is 0.5gsm to 0.9gsm, preferably 0.8gsm, the solid content is 100%, the viscosity is 140 CPS to 250CPS, and preferably 212 CPS.
The release agent layer 12 is used as a functional layer of the release paper, and the related performance of the release agent layer is the primary functional index of the release paper, so that the coating and drying process of the silicone oil needs to be deeply researched, and in order to enable the release agent layer 12 formed by the release agent layer to achieve the characteristics of small amount, high flatness, uniform thickness, high glossiness and stable and small release force, the quality and the process of the silicone oil need to be strictly controlled.
On the ultra-low gram weight release paper, only after the process target of large gluing amount is realized, the process target of low silicon coating amount can be finally realized, and the gluing requirement of large coating amount is not facilitated by low-viscosity glue to ensure the glue leveling effect and the full coverage of the glue on the paper, and the large gluing amount can inevitably cause a large amount of water to be coated on the paper surface, so that the paper is wetted, and therefore, a large amount of verification and adjustment are required to be carried out on the glue formula.
Therefore, the method selects the way of improving the solid content of the glue, thereby ensuring that the actual glue coating moisture content is not too large when the glue coating amount is large, and ensuring the balance between the glue leveling effect and the roller hanging effect when gluing by adding the viscosity regulator in the glue, and finally solving the problem that the paper under the large glue coating amount cannot be produced due to the expansion of the paper.
Under the condition that the ultralow-gram-weight release paper realizes large coating weight and can ensure the flatness of the coated paper, the surface smoothness of the paper can be greatly improved, and under the coating process, the surface smoothness of the processed ultralow-gram-weight release paper can reach more than 600 s. Therefore, the silicon can be coated on the gummed paper with obviously improved smoothness, the coating with large silicon coating amount is avoided, the paper coverage after silicon oil coating is ensured, and the process target of low silicon coating amount is realized.
As a preferred embodiment, the anti-curl glue in step S6 is PVA glue, and the glue has a glue dry weight of 0.1-0.2gsm, a solid content of 2.95%, and a viscosity of 4.7CPS. And the drying temperature of the silicone oil in the step S5 is 150-180 ℃, and the drying time is 4S. The drying temperature of the anti-rolling glue in the step S7 is 60-70 ℃.
If the normal glue with higher solid content is directly used for back gluing in the early stage, the solid content reaches more than 7-9%, and after back gluing, the glue penetrates into the silicon coating layer due to overlarge glue gluing amount, so that the performance parameter of the silicon oil stripping force is influenced. In order to avoid the similar problems, tap water is directly used as a coating liquid in the former process, but a back coating anti-rolling layer cannot be formed in the former process, and only a part of the back coating anti-rolling layer can play a role in humidifying.
In order to solve the problem, the formula of the back glue coating water is optimized, and the technological parameters of 2.95% of solid content, 4.7% of viscosity and 0.1-0.23gsm of coating weight are finally formed, so that an effective anti-rolling layer is formed, and the phenomenon of poor peeling force of a silicon coating layer caused by excessive glue coating and paper glue seepage is avoided.
The invention also optimizes the temperature of the silicone oil oven, adopts the solidification temperature of 180-200 ℃ from the previous stage, adjusts the solidification temperature to 150-180 ℃, realizes the solidification with low temperature and large air volume, avoids the paper breaking problem in the coating process caused by excessive water loss of paper, and ensures the continuity of the coating process.
The invention also optimizes the process temperature of the back coating oven, reduces the temperature of the oven from 100 ℃ in the early stage to 60-70 ℃, realizes low-temperature large-air-volume drying and avoids paper deformation caused by too fast water loss of the paper.
As shown in FIG. 2, the release paper produced by the above process comprises a paper material 1, a glue layer 11 disposed on the smooth surface of the paper material 1, a release agent layer 12 disposed on the glue layer 11, and an anti-curl layer 13 disposed on the rough surface of the paper material 1, wherein the paper material 1 is an ultra-low grammage release paper with a weight not less than 27 gsm.
The structure of the release paper is manufactured based on the process disclosed by the invention, so that the release paper has the advantages of ultralow gram weight, smooth surface, strong toughness, small release force and the like, and has wider application prospect.
The invention has the beneficial effects that in the manufacturing process of the release paper, coating is carried out twice on the smooth surface of the paper material to form a glue layer and a release agent layer in sequence, then back coating is carried out on the rough surface of the paper material to form an anti-rolling layer, the process layout is carried out according to the characteristics of the paper material, glue, silicon oil and anti-rolling glue in the manufacturing process, and the coating and drying processes are reasonably designed, so that the overall thickness of the release paper is thinner, the gram weight is smaller, the coating is more uniform, the surface of the release paper is smoother, the toughness is stronger, and the release force is more stable and smaller; the anti-rolling layer is formed by back coating on the rough surface, and non-contact humidification is performed, so that the toughness of the release paper is enhanced, and the phenomenon of edge rolling and edge curling of the release paper is prevented.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and adaptations can be made without departing from the principle of the present invention, and such modifications and adaptations should also be considered as the scope of the present invention.

Claims (10)

1. A manufacturing process of release paper is characterized in that: comprises the following steps of (a) preparing a solution,
s1, selecting materials, wherein the gram weight is 27-28gsm, the water content is 5-7%, the thickness is 35-50 mu m, and the tightness is 0.73-0.9g/m 3 The paper material of the thin page comprises a smooth surface and a rough surface which are oppositely arranged, is unreeled through unreeling equipment and unreeled to gluing equipment for gluing;
s2, priming, namely unreeling the paper material to a gluing device through an unreeling device for gluing, and coating a layer of glue on the smooth surface of the paper material by the gluing device;
s3, drying glue, namely after the paper is glued by the gluing equipment, transmitting the paper to the glue drying equipment in an ultrashort distance for drying so as to form a glue layer on the smooth surface of the paper;
s4, a release agent layer, namely conveying the paper material forming the glue layer to a silicone oil feeding device for silicone oil feeding operation, and coating a layer of silicone oil on the glue layer by the silicone oil feeding device;
s5, drying silicone oil, namely, after the silicone oil is completely coated on the paper material by the silicone oil coating equipment, transmitting the paper material to the silicone oil drying equipment for drying so as to form a release agent layer on the glue layer of the paper material;
s6, back coating, namely conveying the paper material with the release agent layer to back coating equipment for back coating, and coating a layer of anti-rolling glue on the rough surface of the paper material by the back coating equipment;
s7, glue is dried, and after the paper is subjected to back coating by back coating equipment, the paper is conveyed to a back coating drying box to be dried, so that an anti-rolling layer is formed on the rough surface of the paper;
s8, water replenishing and moisture regaining, namely performing non-contact water replenishing and moisture regaining on the paper forming the anti-rolling layer;
s9, winding the paper material forming the anti-winding layer by using winding equipment;
the glue in the step S2 is PVA glue, and the dry weight of the glue is 1.0 gsm;
the glue in the step S2 is latex, and the dry weight of the glue is 1gsm;
the silicone oil in the step S4 is solvent-free silicone oil, and the coating weight of the silicone oil is 0.5gsm-0.9gsm.
2. The process for manufacturing release paper according to claim 1, wherein: the grammage tolerance of the paper is 0.4-0.9gsm.
3. The process for manufacturing release paper according to claim 1, wherein: the smoothness of the glossy surface of the paper is 52.4-426.2S, the smoothness of the matte surface of the paper is 13.5-1.6.3S, the transverse tensile strength of the paper is 1.1-2.1KN/m, and the longitudinal tensile strength of the paper is 2.2-4.2 KN/m.
4. The process for manufacturing release paper according to claim 1, wherein: the glue in the step S2 is PVA glue, the viscosity of the glue is 140-380CPS, the solid content is 7-9%, and the pH value is 5.78.
5. The process for manufacturing release paper according to claim 1, wherein: the glue in the step S2 is latex, the viscosity of the glue is 38CPS, the solid content of the glue is 13.8-17.8%, and the pH value of the glue is 7.23.
6. The process for manufacturing release paper according to claim 1, wherein: the silicone oil in the step S4 is solvent-free silicone oil, the solid content is 100%, and the viscosity is 140-250CPS.
7. The process for manufacturing release paper according to claim 1, wherein: the anti-rolling glue in the step S6 is PVA glue, the gluing dry weight of the anti-rolling glue is 0.1-0.2gsm, the solid content is 1-3%, and the viscosity is 4.7CPS.
8. The process for manufacturing release paper according to claim 6, wherein: and the drying temperature of the silicone oil in the step S5 is 150-180 ℃, and the drying time is 4S.
9. The process for manufacturing release paper according to claim 7, wherein: the drying temperature of the anti-rolling glue in the step S7 is 60-70 ℃.
10. A release paper produced by the manufacturing process according to any one of claims 1 to 9, characterized in that: comprises paper material, a glue layer arranged on the smooth surface of the paper material, a release agent layer arranged on the glue layer and an anti-rolling layer arranged on the rough surface of the paper material.
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