CN112748237B - Original warping detection method for copy paper - Google Patents
Original warping detection method for copy paper Download PDFInfo
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- CN112748237B CN112748237B CN202011591430.7A CN202011591430A CN112748237B CN 112748237 B CN112748237 B CN 112748237B CN 202011591430 A CN202011591430 A CN 202011591430A CN 112748237 B CN112748237 B CN 112748237B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/34—Paper
- G01N33/346—Paper paper sheets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention relates to the technical field of papermaking, and discloses a copy paper original warpage detection method, which is realized by using a paper cutter, a punching machine, a wood label, a lamp box and a millimeter scale, and comprises the following steps: step one, sampling a mother roll; step two, preparing a sample; step four, sample penetration; step five, detection; and step six, reading and recording the result and judging the result. The original warpage detection method for copy paper provided by the invention is suitable for warpage detection of cultural paper series such as copy paper and the like, and has the characteristics of simple operation and fast result; meanwhile, the original warpage detection method for the copy paper is little influenced by factors such as external environment, the influence of moisture on paper warpage is eliminated in the detection process, the accuracy rate of detecting the warpage direction of the copy paper is high, the position of the paper machine can be corresponded according to the warpage direction and the serial number of the sample, the reason of warpage caused by original warpage analysis of the copy paper can be rapidly analyzed, and the method is pertinently adjusted, is convenient and rapid.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a method for detecting original warping of copy paper.
Background
The warping of the copy paper can cause confusion for the use of the terminal user, and the warping can affect the machine passing performance of the paper, make the printed file uneven and make the photocopied file beautiful.
Therefore, the current warp test method of copy paper is completed by a photocopying process (copying or printing). A common laser photocopying device forms a printed image by completely adsorbing carbon powder particles to paper fibers through a thermal transfer unit (heating and pressurizing in a fixing process). During printing, the high temperature and high pressure generated by the photocopying equipment can cause the paper to release water, and the printed paper sheet is warped. But the method for testing the warping of the copy paper has high cost, such as the need of adding a special copying machine, purchasing equipment, maintaining cost and the like; and the detection result can be influenced by factors such as environment temperature and humidity, typesetting mode of a photocopy document, speed of the copier, running time of the copier and the like, so that the detection of the warping direction of the copy paper is inaccurate.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide the original warpage detection method for the copy paper, which is suitable for warpage detection of cultural paper series such as copy paper and the like, has the characteristics of simple operation and quick result output, is less influenced by factors such as external environment and the like, and can eliminate the influence of moisture on paper warpage in the detection process.
In order to achieve the purpose, the invention adopts the following scheme:
a method for detecting original warping of copy paper is realized by using a paper cutter, a perforating machine, a wood label, a lamp box and a millimeter scale, and comprises the following steps:
step one, mother roll sampling:
samples are taken in parallel on the length of the banner from the operation side to the transmission side of the parent roll;
step two, sample preparation:
in the direction from the operation side of the mother roll to the transmission side, the front surface of the sample is marked with numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 in sequence at uniform intervals of 16;
manually folding the sample four times;
cutting 16 samples from the middle of the folded sample by using a paper cutter, wherein the upper surface/lower surface of the sample cannot be reversed after the sample is cut;
punching at the same position of each sample by using a punching machine;
step three, sample marking:
the numbers of the samples marked from top to bottom are as follows:
2、15、10、7、6、11、14、3、4、13、12、5、8、9、16、1；
step four, sample penetration:
the marked 16 samples are penetrated on the wood stick at intervals according to the sequence of the marks, so that the samples are not interfered with each other, wherein the front side or the back side of each sample is kept consistent;
step five, detection:
adjusting the temperature of the lamp box to a temperature T, wherein the preheating time is T1 until the constant temperature is reached;
suspending the sample in a lamp box which is preheated at a constant temperature, wherein the heating time is t 2;
after heating time t2, the sample will reach the maximum warpage and assume a fixed position; selecting the most extreme warping degree as the final warping degree of the sample;
measuring the warping degree of each sample by using a millimeter scale;
reading and recording the result and judging the result:
reading and recording the measured warping degree of each sample;
according to the measured warping degree of each sample;
if the warping degree of the sample is less than or equal to the set warping value; the test specimen is qualified, otherwise, the test specimen is not qualified.
Further, in the first step, 3 samples are taken in parallel in the length of the cross-web from the operating side to the driving side of the parent roll, wherein one sample sheet is used for detection, one sample sheet is used for sample retention, and one sample sheet is used for standby.
Further, in the second step, the same position of each sample is specifically: the center position in the transverse direction of each sample is 6-8mm away from the upper edge of the sample in the longitudinal direction of the sample, wherein the transverse direction of the sample is the direction perpendicular to the running direction of the paper machine (namely the direction from the operation side of the mother roll to the transmission side of the mother roll); the longitudinal direction of the sample is the same as the running direction of the paper machine.
Further, the banner length from the operating side of the parent roll to the drive side thereof is 8000 mm;
in step three, the sample marked with the numeral 1 represents the position of 0 to 500mm from the operating side of the paper machine to the driving side of the parent roll;
the sample with reference numeral 2 represents the position of the parent roll from 500mm to 1000mm from the operating side of the machine to the driving side;
by analogy, the sample identified by reference numeral 16 represents the position of the parent roll from the machine operating side to the drive side of 7500mm to 8000 mm.
Further, in the fifth step, the temperature T is 110-; the preheating time t1 is 30-40 min; the time t2 is 2-3 min.
Further, in the fifth step, the measuring the warpage of each sample by using the millimeter scale specifically includes: measuring the distance between the plane of each sample passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample by using a millimeter scale as the warping degree of the sample; the plane passing through the warping axis of the sample is taken as a starting point, the plane passing through the maximum warping position of the edge of the sample is taken as an end point, and the plane passing through the warping axis of the sample is parallel to the plane passing through the maximum warping position of the edge of the sample.
Further, in the fourth step, the warpage of the sample is:
when the sample is warped transversely, the warping axis of the sample is perpendicular to the longitudinal direction of the sample, and the position where the rearmost end of the sample warps maximally in the transverse direction of the sample is the warping axis of the sample; at this time, the distance between the plane passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample and is recorded as L1;
or when the sample is warped longitudinally, the warping axis of the sample is perpendicular to the transverse direction of the sample, and the position where the rearmost end of the sample is warped to the maximum in the longitudinal direction of the sample is the warping axis of the sample; at this time, the distance between the plane passing through the warped shaft of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample and is recorded as L2;
or, when the sample is warped diagonally, if the warping axis of the sample is neither parallel to nor perpendicular to the longitudinal direction of the sample, the position where the rearmost end of the sample reaches the maximum warping is the warping axis of the sample, and at this time, the distance between the plane passing through the warping axis of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample, which is recorded as L3;
wherein, the transverse direction of the sample is a direction perpendicular to the running direction of the paper machine (namely the direction from the operation side of the mother roll to the transmission side of the mother roll); the longitudinal direction of the sample is the same as the running direction of the paper machine.
Further, in the sixth step, the set warpage value is 10 mm.
Further, in the fourth step, after each sample is threaded on the wood stick, a piece of protective paper is threaded on both ends of the wood stick.
Furthermore, the lamp box comprises a box body, an organic glass cover plate, a heating lamp, a temperature controller, a temperature sensor, a power line and a hook frame for hanging the tested sample; the box body is provided with a working port; the organic glass cover plate covers the working opening; the heating lamp and the temperature sensor are both positioned in the box body; the temperature controller is arranged outside the box body; the upper end and the lower end of the hook frame are fixedly arranged on the upper end and the lower end of the box body.
Further, the box wall of the box body comprises an outer wall layer and an inner wall layer; the outer wall layer is a 304 stainless steel plate; the inner wall layer is an aluminum silicate ceramic fiber paper laminate.
Compared with the prior art, the invention has the following advantages:
the original warpage detection method for the copy paper is suitable for warpage detection of cultural paper series such as copy paper and the like, and has the characteristics of simple operation and quick result; meanwhile, the original warpage detection method for the copy paper is little influenced by factors such as external environment, the influence of moisture on paper warpage is eliminated in the detection process, the accuracy rate of detecting the warpage direction of the copy paper is high, the position of the paper machine can be corresponded according to the warpage direction and the serial number of the sample, the reason of warpage caused by original warpage analysis of the copy paper can be rapidly analyzed, and the method is pertinently adjusted, is convenient and rapid.
Drawings
The present application will be described in further detail with reference to the following drawings and detailed description.
Fig. 1 is a schematic perspective view of a light box for detecting original warping of copy paper according to the present application.
Fig. 2 is a schematic perspective view of the hanger bracket of the present application.
Fig. 3 is a schematic diagram of an original warp detection method of the copy paper of the present application.
Fig. 4 is a schematic structural diagram of a mother roll and a sample of the copy paper original warp detection method of the present application.
Fig. 5 is a schematic diagram of the sample marked with numbers on the front surface in step two of the copy paper original warp detection method of the present application.
Fig. 6 is a schematic diagram of the copy paper original warp detection method after punching the sample in step two.
FIG. 7 is a schematic structural diagram of a wood-labeled test sample in step four of the copy paper original warp detection method of the present application,
fig. 8 is a schematic diagram of the copy paper original warp detection method of the present application when the sample warps in the lateral direction in step five.
Fig. 9 is a schematic diagram of the original warp detection method of the copy paper of the present application when the sample warps in the longitudinal direction in step five.
Fig. 10 is a schematic diagram of the original warp detection method of the copy paper of the present application when the sample is warped diagonally in step five.
FIG. 11 is a schematic view of the moisture profile of a parent roll of the present application.
Fig. 12 is a schematic diagram of the distribution of the sizing amount of the size press of the present application to the front and back sides of a parent roll banner.
The figure includes:
the temperature control device comprises a box body 1, an outer wall layer 11, an inner wall layer 12, a working opening 13, an organic glass cover plate 2, a heating lamp 3, a temperature controller 4, a temperature sensor 5, a power line 6, a hook rack 7, an upper support rod 71, a lower support rod 72, a first connecting rod 73, a second connecting rod 74, a third connecting rod 75, a first hanging hook 76, a second hanging hook 77 and a wood label 8.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 12, a lamp box for detecting original warping of copy paper comprises a box body 1, an organic glass cover plate 2, a heating lamp 3, a temperature controller 4, a temperature sensor 5, a power line 6 and a hook rack 7 for hanging a wood stick 8 penetrated with a detected sample; the box body 1 is provided with a working port 13; specifically, a working opening 13 is formed in the center of the upper portion of the box body 1, and the organic glass cover plate 2 covers the working opening 13; the heating lamp 3 and the temperature sensor 5 are both positioned in the box body 1; the temperature controller 4 is arranged outside the box body 1; the upper end and the lower end of the hook frame 7 are fixedly arranged on the upper end and the lower end of the box body 1.
The lamp box for detecting the original warping of the copy paper controls the heating lamp 3 and the temperature sensor 5 to be started through the temperature controller 4, so that the heating lamp 3 heats the interior of the box body 1, and the temperature sensor 5 is used for detecting the temperature until the temperature of the interior of the box body 1 reaches a constant temperature; then, samples to be detected penetrate through the wood sticks 8 at intervals, the wood sticks 8 enter from the working opening 13 and are hung on the hook rack 7, the organic glass cover plate 2 is covered, and after the set heating time is reached; the sample reaches the maximum warping degree and presents a fixed position, and the wood stick 8 is taken out to facilitate the original warping detection of the sample; therefore, the lamp box for detecting the original warping of the copy paper is not influenced by the external environment, the detection environment is stable and reliable, the influence of the water content of the paper on the warping of the paper is eliminated, and the reason of the original warping of the copy paper caused by the original warping analysis of the paper is eliminated, so that a paper machine is guided to make a correct adjustment direction. Meanwhile, the lamp box for detecting the original warpage of the copy paper is adopted to carry out the original warpage detection experiment of the copy paper, the detection speed is high, the experiment data can be quickly obtained, the experiment data can be stably obtained, and the reference value is very high. And the lamp box for detecting the original warping of the copy paper has low cost, is simple, convenient and safe to operate, and can be used for skillfully mastering the use method by simply training an operator.
The box wall of the box body 1 comprises an outer wall layer 11 and an inner wall layer 12; the outer wall layer 11 is a 304 stainless steel plate; the inner wall layer 12 is an aluminum silicate ceramic fiber paper laminate. The 304 stainless steel plate is adopted as the outer wall layer 11, so that the box body 1 is stable and firm in structure, good in heat resistance and long in service life. And the inner wall layer 12 is made of an aluminum silicate ceramic fiber paper laminate, so that the shell of the box body 1 is prevented from being scalded, and the heat preservation effect inside the box body 1 is achieved.
In this embodiment, the wall thickness of the outer wall layer 11 is 2-4 mm; the wall thickness of the inner wall layer 12 is 5-7 mm. Preferably, the wall thickness of the outer wall layer 11 is 3 mm; the wall thickness of the inner wall layer 12 is 6 mm. By setting the wall thickness of the outer wall layer 11 and the inner wall layer 12 reasonably, the whole stability of the box body 1 is ensured, the heat preservation effect is good, and the manufacturing cost of the box body 1 is controlled.
The hook rack 7 is arranged in the center of the box body 1, and the hook rack 7 is a stainless steel hook rack 7. The hanger bracket 7 comprises an upper support rod 71, a lower support rod 72, a first connecting rod 73, a second connecting rod 74, a third connecting rod 75, a first hanging hook 76 and a second hanging hook 77; the upper support rod 71 is arranged at the upper end of the box body 1; the lower support rod 72 is arranged at the lower end of the box body 1; the first connecting rod 73, the first hanging hook 76, the second connecting rod 74, the second hanging hook 77 and the third connecting rod 75 which are connected in sequence are arranged between the two ends of the upper supporting rod 71 and the two ends of the lower supporting rod 72; the wooden stick 8 is hung on the two first hanging hooks 76 or the two second hanging hooks 77. The first connecting rod 73, the first hanging hook 76, the second connecting rod 74, the second hanging hook 77 and the third connecting rod 75 form a hook assembly, and the two hook assemblies are respectively arranged between the two ends of the upper support rod 71 and the two ends of the lower support rod 72 to facilitate the hanging of the wood stick 8, so that the uniform heating of the sample is ensured; and the arrangement of the first hanging hook 76 and the second hanging hook 77 facilitates the placement of the wood label 8 and the detection of multiple groups of samples.
Preferably, the first hanging hook 76 and the second hanging hook 77 are identical; the first hanging hook 76 includes a first hook stem and a second hook stem; one end of the first hook lever is connected with the upper end of the second connecting lever 74; the other end extends obliquely downward relative to the second connecting rod 74; both ends of the second hook rod are connected to the lower end of the first connecting rod 73 and the other end of the first hook rod, respectively. By inclining the first hook rod downwards relative to the second connecting rod 74 and forming a hook similar to a V-shaped structure with the second hook rod, the first hanging hook 76 and the second hanging hook 77 facilitate the hanging of the wood stick 8, save the placing time and stably place the wood stick 8.
The box body 1 is in a cuboid shape, and the specification is 850 × 350 mm. The length of the upper support rod 71 is 300 mm; the length of the lower support rod 72 is 280 mm; the distance between the upper support rod 71 and the lower support rod 72 is 300 mm; the length of the first connecting rod 73 is 10 mm; the length of the second connecting rod 74 is 120 mm; the length of the second connecting rod 74 is 120 mm; the length of the wood stick 8 is 290 mm and 300mm, preferably 300 mm; the wooden stick 8 is a cylinder with a diameter of 3 mm. The box body 1 and the wood stick 8 are simple in structure, convenient to manufacture, low in cost, convenient and practical.
The working opening 13 is a rectangular opening; the specification of the working port 13 is 280mm by 160 mm; the organic glass cover plate 2 is a rectangular plate body; the specification of the organic glass cover plate 2 is 320 x 200 x 0.5mm, namely the length of the organic glass cover plate is 320mm, the width of the organic glass cover plate is 200mm, and the thickness of the organic glass cover plate is 0.5 mm. Through setting up the specification for 280mm, conveniently place the wooden stick 8 to the box 1 in, organic glass apron 2 can seal the lid on work port 13 in the course of the work simultaneously, prevents that the heat from scattering and disappearing, convenient and practical.
In the present embodiment, the number of the heating lamps 3 is 2; the 2 heating lamps 3 are oppositely arranged on the inner wall layers 12 at the left end and the right end of the box body 1. The 2 heating lamps 3 are arranged on the inner wall layers 12 at the left end and the right end of the box body 1, so that the temperature rise inside the box body 1 is accelerated until the inside of the box body 1 reaches the set constant temperature. The heating lamp 3 comprises an E27 ceramic lamp holder and a bulb; the bulb is an E27 screw bulb, an E27 ceramic lamp holder is arranged on the inner wall layer 12 of the box body 1, and the bulb is connected with the E27 ceramic lamp holder in a screw way. The lamp bulb can select 550-2000W according to different temperature requirements. Of course, the number of the heating lamps 3 is appropriately set according to the requirement.
The lamp box is provided with a temperature controller 4, and a temperature sensor 5 is arranged in the box body 1 and used for detecting the temperature in the lamp box. The temperature in the box body 1 is controlled by the temperature controller 4, the temperature can be freely adjusted from normal temperature to 200 ℃, the intelligent operation is realized, and the control precision can reach 0.1 ℃.
In summary, the embodiment of the present invention provides a light box for detecting original warpage of copy paper, wherein the light box for detecting original warpage of copy paper has the following advantages:
the lamp box for detecting the original warping of the copy paper can not be influenced by the external environment, the detection environment is stable and reliable, the influence of the water content of the paper on the warping of the paper is eliminated, and the reason of the original warping of the copy paper caused by the analysis of the original warping of the paper is eliminated, so that a paper machine is guided to make a correct adjustment direction.
The lamp box for detecting the original warpage of the copy paper is adopted to carry out the original warpage detection experiment of the copy paper, the detection speed is high, the experiment data can be quickly obtained, the experiment data can be stably obtained, and the reference value is very high.
The lamp box for detecting the original warping of the copy paper has the advantages of low cost, simple and convenient operation and safety, and the using method can be mastered by simply training operators.
The light box for detecting the original warping of the copy paper is used for placing a sample in a constant environment, uniformly releasing water on two surfaces of the sample to be tested by gradually depending on a natural drying method, eliminating the influence of the water on the warping of the sample, detecting the warping direction of paper, and having high utilization value of results.
The application also provides a copy paper original warpage detection method, which is realized by utilizing the paper cutter, the perforating machine, the wood label, the lamp box and the millimeter scale, wherein the lamp box is the lamp box for detecting the original warpage of the copy paper. The original warping detection method of the copy paper comprises the following steps:
step one, mother roll sampling:
samples are taken in parallel in the length of the banner from the operation side to the transmission side of the parent roll; samples were taken 3 in parallel over the length of the web from the operating side to the drive side of the parent roll, one for inspection, one for sample retention and one for standby. And by setting: the transverse direction of the sample is the direction from the operation side of the mother roll to the transmission side of the mother roll; the longitudinal direction of the sample is the length transmission direction of the mother roll.
Step two, sample preparation:
in the direction from the operation side of the mother roll to the transmission side, the front surface of the sample is marked with numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 at even intervals;
manually folding the sample four times;
cutting 16 samples from the middle of the folded sample by using a paper cutter, wherein the upper surface/lower surface of the sample cannot be reversed after the sample is cut;
punching at the same position of each sample by using a punching machine; wherein, the same position of each sample is specifically as follows: the center position in the transverse direction of each sample and the position 6-8mm away from the upper edge of the sample in the longitudinal direction of the sample, preferably, the center position in the transverse direction of each sample and the position 7mm away from the upper edge of the sample in the longitudinal direction of the sample; and the sample transverse direction is the direction perpendicular to the machine running direction (i.e. the direction from the operating side of the parent roll to its drive side); the longitudinal direction of the sample is the same as the running direction of the paper machine.
Step three, sample marking:
the numbers of the samples marked from top to bottom are as follows:
2、15、10、7、6、11、14、3、4、13、12、5、8、9、16、1；
wherein, in the embodiment, the width length from the operation side of the mother roll to the transmission side of the mother roll is 8000 mm; the sample with reference numeral 1 represents the position of 0 to 500mm from the operating side to the driving side of the parent roll; the sample with reference numeral 2 represents the position of the parent roll from 500mm to 1000mm from the operating side of the machine to the driving side; by analogy, the sample identified by reference numeral 16 represents the position of the parent roll from the machine operating side to the drive side of 7500mm to 8000 mm.
Step four, sample penetration:
and (3) penetrating the marked 16 samples on the wood stick at intervals according to the sequence of the marks, so that the samples are not interfered with each other, wherein the front side or the back side of each sample is kept consistent.
Step five, detection:
adjusting the temperature of the lamp box to a temperature T, wherein the preheating time is T1 until the constant temperature is reached; the temperature T is 110-120 ℃, preferably 115 ℃, and the preheating time T1 is 30-40min, preferably 30 min;
suspending the sample in a lamp box which is preheated at a constant temperature, wherein the heating time is t 2; the time t2 is 2-3min, preferably 2 min.
After heating time t2, the sample will reach the maximum warpage and assume a fixed position; selecting the most extreme warping degree as the final warping degree of the sample;
measuring the warping degree of each sample by using a millimeter scale; wherein, the warping degree of utilizing the millimeter scale to measure each sample specifically is: measuring the distance between the plane of each sample passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample by using a millimeter scale as the warping degree of the sample; the plane passing through the warping axis of the sample is taken as a starting point, the plane passing through the maximum warping position of the edge of the sample is taken as an end point, and the plane passing through the warping axis of the sample is parallel to the plane passing through the maximum warping position of the edge of the sample. For the case of warp of the sample, it is possible to:
when the sample is warped transversely, the warping axis of the sample is perpendicular to the longitudinal direction of the sample, and the position where the rearmost end of the sample warps maximally in the transverse direction of the sample is the warping axis of the sample; at this time, the distance between the plane passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample and is recorded as L1;
or when the sample is warped longitudinally, the warping axis of the sample is perpendicular to the transverse direction of the sample, and the position where the rearmost end of the sample is warped to the maximum in the longitudinal direction of the sample is the warping axis of the sample; at this time, the distance between the plane passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample and is recorded as L2;
or, when the sample is warped diagonally, if the warping axis of the sample is neither parallel to nor perpendicular to the longitudinal direction of the sample, the position where the rearmost end of the sample reaches the maximum warping is the warping axis of the sample, and at this time, the distance between the plane passing through the warping axis of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample, which is recorded as L3;
wherein, the transverse direction of the sample is a direction vertical to the running direction of the paper machine (namely the direction from the operation side of the mother roll to the transmission side thereof); the longitudinal direction of the sample is the direction consistent with the running direction of the paper machine.
Reading and recording the result and judging the result:
reading and recording the measured warping degree of each sample;
according to the measured warping degree of each sample;
if the warping degree of the sample is less than or equal to the set warping value; the sample is qualified, otherwise, the sample is unqualified; the set warpage value was 10 mm.
Preferably, in the fourth step, after each sample is put on the wood stick, a piece of protective paper is put on both ends of the wood stick, which helps to prevent the sample from being polluted.
The original warpage detection method for copy paper is suitable for warpage detection of cultural paper series such as copy paper and the like, and has the characteristics of simple operation and quick result; meanwhile, the original warpage detection method for the copy paper is little influenced by factors such as external environment, the influence of moisture on paper warpage is eliminated in the detection process, the accuracy rate of detecting the warpage direction of the copy paper is high, the position of the paper machine can be corresponded according to the warpage direction and the serial number of the sample, the reason of warpage caused by original warpage analysis of the copy paper can be rapidly analyzed, and the method is pertinently adjusted, is convenient and rapid.
The original warpage detection method of the copy paper is suitable for warpage test when the copy paper is produced by a paper mill, and the optimized values of the temperature T, the preheating time T1 and the time T2 are used in the original warpage detection method of the copy paper; the warp degrees of 16 samples, namely the detection result of the warp degree of the parent roll banner, are measured according to the original warp detection method of the copy paper, and the following table 1 is shown:
in the data of the warpage in table 1 above, the data of the warpage is "+": the warp of the paper to the front side is shown, and the data is positive. Data for warp is "-": indicates the warping degree of the paper to the reverse side, and the data is negative.
Then, samples are taken in parallel from the operation side of the mother roll to the length of the horizontal web from the transmission side of the mother roll, according to the method standard of GB/T462 for measuring the moisture of paper and paperboard, sample points are taken at intervals of 500mm on the samples for detection, 16 points are taken for sample point detection, the initial detection sample points are 250mm from the operation side to the transmission side of the mother roll, and the moisture distribution of the horizontal web of the mother roll is detected, as shown in the following table 2:
where in Table 2, location TS-DS refers to the operative side of the parent roll to its drive side.
From the warpage results in table 1, it can be seen that the reverse warpage of the operation side 3250 and 4750mm is large, and from table 2 and fig. 11, the inspection of the process control parameters shows that the operation side 3250 and 4750mm of the mother roll moisture is greater than 5%, and the difference between the front and back of the glue application amount is large (as in fig. 12, the upper curve in fig. 12 is a front glue application amount curve, and the lower curve is a back glue application amount curve). The moisture curve of the banner of the mother roll is adjusted to be controlled within 5 percent, and the upper and lower rod pressure of the sizing machine is adjusted to adjust the front/back side sizing amount, so that the warping degree of the copy paper is controlled within a standard range.
The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present application, and these modifications and substitutions should also be regarded as the protection scope of the present application.
Claims (9)
1. A method for detecting original warping of copy paper is characterized by comprising the following steps: the method is realized by utilizing a paper cutter, a perforating machine, a wood label, a lamp box and a millimeter scale, and the method for detecting the original warping of the copy paper comprises the following steps:
step one, mother roll sampling:
samples are taken in parallel on the length of the banner from the operation side to the transmission side of the parent roll;
step two, sample preparation:
in the direction from the operation side of the mother roll to the transmission side, the front surface of the sample is marked with numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 at even intervals;
manually folding the sample four times;
cutting 16 samples from the middle of the folded sample by using a paper cutter, wherein the upper surface/lower surface of the sample cannot be reversed after the sample is cut;
punching at the same position of each sample by using a punching machine;
step three, sample marking:
the numbers of the samples marked from top to bottom are as follows:
2、15、10、7、6、11、14、3、4、13、12、5、8、9、16、1；
step four, sample penetration:
the marked 16 samples are penetrated on the wood stick at intervals according to the sequence of the marks, so that the samples are not interfered with each other, wherein the front side or the back side of each sample is kept consistent;
step five, detection:
adjusting the temperature of the lamp box to a temperature T, wherein the preheating time is T1 until the constant temperature is reached;
suspending the sample in a lamp box which is preheated at a constant temperature, wherein the heating time is t 2;
after heating time t2, the sample will reach the maximum warpage and assume a fixed position; wherein, the most extreme warping degree is selected as the final warping degree of the sample;
measuring the warping degree of each sample by using a millimeter scale;
in the fifth step, the measuring the warping degree of each sample by using the millimeter-scale ruler specifically comprises: measuring the distance between the plane of each sample passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample by using a millimeter scale as the warping degree of the sample; the plane passing through the warping axis of the sample is taken as a starting point, the plane passing through the maximum warping position of the edge of the sample is taken as an end point, and the plane passing through the warping axis of the sample is parallel to the plane passing through the maximum warping position of the edge of the sample;
reading and recording the result and judging the result:
reading and recording the measured warping degree of each sample;
according to the measured warping degree of each sample;
if the warping degree of the sample is less than or equal to the set warping value; the test specimen is qualified, otherwise, the test specimen is not qualified.
2. The method for detecting original warping of copy paper according to claim 1, wherein: in the first step, 3 samples are taken in parallel in the length of the cross web from the operating side to the driving side of the parent roll, wherein one sample sheet is used for detection, one sample sheet is used for sample retention, and one sample sheet is used for standby.
3. The method for detecting original warping of copy paper according to claim 1, wherein: in the second step, the same position of each sample is specifically: the center position in the transverse direction of each sample is 6-8mm away from the upper edge of the sample in the longitudinal direction of the sample, wherein the transverse direction of the sample is the direction perpendicular to the running direction of the paper machine (namely the direction from the operation side of the mother roll to the transmission side of the mother roll); the longitudinal direction of the sample is the same as the running direction of the paper machine.
4. The method for detecting original warping of copy paper according to claim 1, wherein: the banner length from the operation side of the mother roll to the transmission side of the mother roll is 8000 mm;
in step three, the sample with reference numeral 1 represents the position of 0 to 500mm from the operating side of the paper machine to the driving side of the parent roll;
the sample with reference numeral 2 represents the position of the parent roll from 500mm to 1000mm from the operating side of the machine to the driving side;
by analogy, the sample identified by reference numeral 16 represents the position of the parent roll from the machine operating side to the drive side of 7500mm to 8000 mm.
5. The method for detecting original warpage of copying paper according to claim 1, characterized in that: in the fifth step, the temperature T is 110-120 ℃; the preheating time t1 is 30-40 min; the time t2 is 2-3 min.
6. The method for detecting original warping of copy paper according to claim 1, wherein: in the fourth step, the warpage of the sample is:
when the sample is warped transversely, the warping axis of the sample is perpendicular to the longitudinal direction of the sample, and the position where the rearmost end of the sample warps maximally in the transverse direction of the sample is the warping axis of the sample; at this time, the distance between the plane passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample and is recorded as L1;
or when the sample is warped longitudinally, the warping axis of the sample is perpendicular to the transverse direction of the sample, and the position where the rearmost end of the sample is warped to the maximum in the longitudinal direction of the sample is the warping axis of the sample; at this time, the distance between the plane passing through the warping shaft of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample and is recorded as L2;
or, when the sample is warped diagonally, if the warping axis of the sample is neither parallel to nor perpendicular to the longitudinal direction of the sample, the position where the rearmost end of the sample reaches the maximum warping is the warping axis of the sample, and at this time, the distance between the plane passing through the warping axis of the sample and the plane passing through the maximum warping position of the edge of the sample is the warping degree of the sample, which is recorded as L3;
wherein, the transverse direction of the sample is the direction vertical to the running direction of the paper machine (namely the direction from the operation side of the mother roll to the transmission side thereof); the longitudinal direction of the sample is the same direction as the running direction of the paper machine.
7. The method for detecting original warpage of copying paper according to claim 1, characterized in that: in the sixth step, the set warpage value is 10 mm.
8. The method for detecting original warping of copy paper according to claim 1, wherein: in the fourth step, after each sample is put on the wood stick, the two ends of the wood stick are respectively put through a piece of protective paper.
9. The method for detecting original warping of copy paper according to claim 1, wherein: the lamp box comprises a box body, an organic glass cover plate, a heating lamp, a temperature controller, a temperature sensor, a power line and a hook frame for hanging a detected sample; the box body is provided with a working port; the organic glass cover plate covers the working opening; the heating lamp and the temperature sensor are both positioned in the box body; the temperature controller is arranged outside the box body; the upper end and the lower end of the hook frame are fixedly arranged on the upper end and the lower end of the box body.
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| CN112748237A (en) | 2021-05-04 |
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