CN104977071A - Lateral gram weight determining method of paper machine - Google Patents
Lateral gram weight determining method of paper machine Download PDFInfo
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- CN104977071A CN104977071A CN201510357100.4A CN201510357100A CN104977071A CN 104977071 A CN104977071 A CN 104977071A CN 201510357100 A CN201510357100 A CN 201510357100A CN 104977071 A CN104977071 A CN 104977071A
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Abstract
The invention discloses a lateral gram weight determining method of a paper machine. The method comprises the steps that a, contiguous lateral paper sheet samples of the preset number are extracted from the outer layer of a female roll; b, the acquired lateral paper sheet samples are preprocessed; and c, based on the lateral paper sheet samples which are preprocessed, the sample weight is analyzed, and a variance analysis method is used to determine MD, CD, surplus and overall standard deviation of corresponding samples. According to the lateral gram weight determining method of the paper machine, which is provided by the invention, the defects of low reliability, complex operation process, poor accuracy and the like in the prior art are overcome, and the method has the advantages of high reliability, simple operation process and great accuracy.
Description
Technical field
The present invention relates to paper field of measuring technique, particularly, relate to a kind of horizontal grammes per square metre defining method of paper machine.
Background technology
Often because the horizontal pattern of paper machine quantitatively changes and do not reach in-mind anticipation value both sides and face a charge in court in opposite directions between current domestic paper machine headbox manufacturer and client, and carry out evaluation analysis because of the quantitative change that the mensuration of method to the horizontal pattern of paper machine that neither one is feasible draws, result causes no evidence institute cannot judge in accordance with the law.How to evaluate the quality of paper machine core component head box, how to rely on a set of feasible method to enroll correct program, controlled by computer to head box, what reach cross direction ration fluctuation minimizes the difficult problem becoming current papermaking aspect.
The method that current paper industry adopts is exactly that cross direction ration is measured, transverse horizontal direction weighs the weight of sample in same straight line serial sampling by balance, by comparing the weight difference determination banner change of weighed sample, in this, as according to the change regulating each reference mark flow of head box, make it quantitatively reach cross direction ration always near what set as far as possible.The maximum shortcoming of the method can not feed back different time fluctuations in discharge in same region exactly, and Computer Analysis control is carried out to different time fluctuations in discharge, result floats wooden dipper by a cucurbit not reach quantitative difference of banner specialized range, and the product of production can not meet the quality standard of market demand.
Realizing in process of the present invention, inventor finds at least to exist in prior art that reliability is low, operating process is complicated and the defect such as poor accuracy.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of horizontal grammes per square metre defining method of paper machine, to realize the advantage that reliability is high, operating process is simple and accuracy is good.
For achieving the above object, the technical solution used in the present invention is: a kind of horizontal grammes per square metre defining method of paper machine, comprising:
A, extract a predetermined number continuous print transverse direction page sample from the skin of parent roll cylinder;
B, to obtain horizontal page sample carry out pre-service;
C, based on pretreated horizontal outturn, analyze example weight, and utilize MD, the CD of the method determination respective sample of variance analysis, residue and total standard deviation.
Further, described step a, specifically comprises:
A1, to obtain according to needing of detecting paper roll complete before by the quantitative distribution copy of online scanner record so that afterwards test time contrast;
A2, according to detect needs, record the operating environment when gathered horizontal page sample collection;
A3, from the skin of the parent roll cylinder of diameter at least 1 meter presets the number of plies, cut a predetermined number continuous print, preset the horizontal page sample of longitudinal width.
Further, described step a3, comprises further:
Mark " FS " in the fore side corner of page, date, the time, paper roll numbering and paper machine numbering;
In the subsides net side of page mark " WS ";
From outermost one deck, by 1, in order each CD page is numbered.
Further, described step b, specifically comprises:
B1, the horizontal page sample obtained is cut into the rectangle pattern of default specification;
B2, based on default defect standard, remove defective rectangle pattern in the rectangle pattern that cuts into, obtain the sample meeting default criterion of acceptability;
B3, to removal defective rectangle pattern after gained sample, after carrying out constant temperature and humidity adjustment, weigh.
Further, described step b2, comprises further:
Use drying box, acceleration is carried out to the rectangle pattern cut into dry;
Use the smooth testing table surface of preset length, the page that will speed up the rectangle pattern after dry process launches, and layering is alignd;
Calculate the sample size that every page of needs cut, and the amount needing never sideline judge to fall; Sample needs continuous adjacent, predetermined width; Dismiss two ends predetermined amount, add the half of every page of trimming edge surplus;
Remove defective rectangle pattern in the rectangle pattern after above-mentioned cutting, obtain the sample meeting default criterion of acceptability.
Further, described step c, specifically comprises:
Use the method for two-way analysis of variance, the CD layer of assessment respective sample, calculate quadratic sum, degree of freedom, all square, F ratio, systematic variance, and calculate standard deviation, the residual sum total variation of CD and MD.
The horizontal grammes per square metre defining method of the paper machine of various embodiments of the present invention, owing to comprising: a, extract a predetermined number continuous print transverse direction page sample from the skin of parent roll cylinder; B, to obtain horizontal page sample carry out pre-service; C, based on pretreated horizontal outturn, analyze example weight, and utilize MD, the CD of the method determination respective sample of variance analysis, residue and total standard deviation; Thus can overcome in prior art that reliability is low, operating process is complicated and the defect of poor accuracy, to realize the advantage that reliability is high, operating process is simple and accuracy is good.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the operational flowchart that in the present invention, pattern gathers;
Fig. 2 cuts detection sample from sample page in the present invention;
Fig. 3 is the summary analysis of Substance in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, as shown in Figure 1-Figure 3, the horizontal grammes per square metre providing a kind of paper machine determines (i.e. Substance) method.
Technical scheme of the present invention, is a kind of change that can be used for determining the horizontal per unit region of paper machine, typically refers to quantitative (or basic weight) although location mode is cumbersome, quite accurately and reliably.Technical scheme of the present invention, using national standard " paper, cardboard, handsheet and Related product testing environment and air standard " the basic step that describes as basic reference, simple to operate, step is clear and definite, is cutting sample respectively, weighs sample and data assessment.
Put in peace in technology of the present invention, horizontal grammes per square metre (Substance) defining method of paper machine is, by extracting the horizontal page sample of 20 continuous print from the skin of parent roll cylinder, and pre-service is carried out to sample, cut into 200mmCD × 300mmMD rectangle pattern, remove the pattern that those have open defect, constant temperature and humidity adjustment is carried out to sample, and weighs, analyze example weight, and utilize variance analysis to determine MD, CD, residue and total standard deviation.
Carrying out evaluation analysis to the quantitative change that the mensuration by the horizontal pattern of paper machine draws, is the effective ways of an evaluation paper machine performance.This method, provides enough accuracies and repetitive operation for the examination of paper making equipment and product index standard.
In technical scheme of the present invention, equipment needed thereby is as following table:
In the inventive solutions, the definition of grammes per square metre, refers to the quality of per unit area, represents the grammes per square metre (g/ ㎡) of every square metre.
the sampling test of technical solution of the present invention is as follows:
In laboratory.Do not make paper foldover, wrinkling or occur wrinkle.The front quantitative distribution copy by online scanner record is completed, so that contrast when testing afterwards according to the acquisition paper roll that needs detected.According to the needs detected, record this batch of former why not normally operating environment of sample collection.
According to national standard " list of paper, cardboard, container board and Related product criticizes sampling and acceptance method ", obtain required sample.Outside the parent roll of diameter at least 1 meter, 100 layers cut 20 parts of horizontal pages of about 400 mm wide (longitudinal direction) continuous print, as shown in Figure 1.Page can not have scratch, wrinkle, pleat and washmarking.Mark upper " FS " (front side) in (fore side) corner before page.Date, time, paper roll numbering and paper machine numbering.Net side mark " WS " (wire side) is pasted at page.Outermost one deck rises, and by 1, numbers in order to each CD page.Carefully sample is put in laboratory with constant temperature and constant humidity and do not make paper foldover, wrinkling or occur wrinkle.The front quantitative distribution copy by online scanner record is completed, so that contrast when testing afterwards according to the acquisition paper roll that needs detected.According to the needs detected, record this batch of former why not normally operating environment of sample collection.See Fig. 1.
the test sample preparation of technical solution of the present invention is as follows:
Sample is placed on dry pre-service under the environment of national Specification " paper, cardboard, handsheet and Related product testing environment and air standard ".It is dry that initial stage can use drying box to carry out acceleration.Page launches by sufficiently long smooth testing table surface, and careful aligns each layer.Calculate the sample size that every page of needs cut, and the amount needing never sideline judge to fall.Sample needs continuous adjacent, 250 mm wides.Dismiss 100 millimeters, two ends, add the half of every page of trimming edge surplus, as shown in Figure 2.
As, a fabric width 4600mm page is cut out as follows: never hold and at least dismiss 100mm, therefore residue detects the maximum 4400mm of sample fabric width.As wide in will 250mm be cut into, 17 parts of qualified samples and 150mm residue will be had.Namely this 150mm should be divided equally often end should be removed same width (175mm) by sanction.The difference that the width dismissed from one end and another side dismiss width should be less than 50mm.According to determined method above, by page according to model be cut into a series of 250CD wide × the long sheet sample of 400mmMD.A pair each increment of numerical reference originally.First bit digital is used for the number of plies showing to count from the outside, and second-order digit represents from fore side number position in the cd direction.With suitable cutter, every part of sheet sample is cut into the rectangle of 200 mm (CD) × 300 mm (MD) by guillotine or paper-cutter.According to T410 regulation, every part of sample-size and theoretical value error should within ± 0.25%.Check each sample.Abandon any containing apparent block coating, grease, filler or the pattern of similar defective area more than 1 square centimeter.Abandoning anyly has hole area more than 1 square centimeter and any other destroyed pattern exceeding license regulation and permit.The grammes per square metre of any undesirable sheet material is replaced by the average grammes per square metre of the most contiguous sample of its two horizontal directions.If obtain failed sample from page two ends, the two panels sample average grammes per square metre that application longitudinal direction goes up before it replaces.Do not carry out any test in what abandon that sample exceedes gross sample number 3%, can not more than 5mm, and specify under standard environment, deposit 24 hours to major general's sample according to TAPPI T402 with separated sample stack thickness.
Technical scheme of the present invention, weighs sample, according to the pattern that form 1 is given, by outcome record in form in the constant temperature moist chamber of requirement condition difference 0.1%.The measurement result of each ply of paper is by filling out in order on continuous print straight line.
one of calculating operation in technical solution of the present invention:
Use common two-way analysis of variance to assess CD layer.Most of statistics textbook can find the mathematical description of the method.In these references, (1-6) can find the basic summary of the method.This scheme two-way analysis of variance method describes the formula used in table 1, has provided the equation listed according to table 1, calculates quadratic sum, degree of freedom, all square, F ratio (longitudinally/laterally), systematic variance and CD(are longitudinally) and MD(horizontal) standard deviation, residual error, and total variation.
Remarks: m=20 in this testing scheme; N is determined by paper machine fabric width; (I, k) corresponding is respectively the number of plies and the CD Position Number of sample to grammes per square metre G subscript.Such as, G(3,5) represent from third layer, paper machine fore side the 5th sample that position is taked quantitative.
calculating operation two in technical solution of the present invention:
The quantitative of each increment product is listed, unit g/ ㎡, three position effective digitals in table 1.List the MD of every bit, CD, residual error, full standard deviation and average basis weight, unit g/ ㎡, three position effective digitals.List F ratio and MD, the CD of MD and CD, and residual error degree of freedom.Be listed in table 1 all MD samples on each CD direction quantitative mean value (
), unit g/ ㎡, three position effective digitals.Quantitatively maximum on each the CD direction marked in table 1, minimum value unit is g/ ㎡, three position effective digitals.With the form of comprehensive distribution graph represent each CD orientation average quantitatively (
) with the funtcional relationship of paper machine banner position, as shown in Figure 3.Horizontal ordinate (or x-axis) represents paper machine banner position, and fore side is initial point, unit mm.Ordinate (or y-axis) represents the deviation with average basis weight, and it is defined as grammes per square metre deviation=(Gk--
) or represent percent deviation=100 × [(Gk--with the number percent of deviation average
)/
].In comprehensive distribution graph, a series of minimax quantitative values, is expressed as grammes per square metre or deviation average number percent, does curve with the function of paper machine banner position, as shown in Figure 3, lists MD, CD, residual error, total standard deviation and the coefficient of variation (CV) CV=s/
× 100.Represent with number percent, retain three position effective digitals.
the degree of accuracy of technical solution of the present invention illustrates:
Test indoor quantitative repeatability than=0.94%, repeatability: under identical conditions, the repeatability after continuous sample introduction.Popular explanation: the sample that first day does, looks to work it out at the same instrument Same Way of same people for second day.
Test indoor quantitatively reappearance than=0.94%, reappearance: reappearance is that the test of room quality inspection is by experiment evaluated.When analytical approach needs standardization, as recorded the method in pharmacopeia, then reappearance should be considered.These test figures are not needed in the document of application listing.Popular explanation: it is feasible that first does a test, can second not admit, whether he requires in person to do in the laboratory second of second, look at feasible.Change laboratory, instrument and people.
Use two-way analysis of variance method in this method of testing, prerequisite is that hypothesis does not significantly influence each other between MD, CD.The F ratio listed in table 2 and degree of freedom can use the form of canonical statistics table to decide confidence level.Table 3 is more typical, and the F value confidence level of display reaches 95%.Such as, if 26 CD samples obtain from 20 every one pages of sample, so the degree of freedom of CD is exactly (26-1) (20-1)=475.If the F ratio of CD is greater than 1.51, so CD will more than 95%(3 with the possibility of residual error significant change).Several statistical method is also had to can be used for analyzing these cross-sectional datas.These methods can identify and the peak value in quantized data, evaluating data stability, and the heteropical root of identification data.In order to ensure these sheet material samples fully through constant temperature and humidity process in 24 hours, can not more than 5mm at described sample stacking thickness.See Fig. 3.
the technique effect of technical solution of the present invention and advantage:
The present invention is a kind of change that can be used for determining the horizontal per unit region of paper machine, typically refers to quantitative (or basic weight) although location mode is cumbersome, quite accurately and reliably; It is simple to operate, and step is clear and definite.
Carrying out evaluation analysis to the quantitative change that the mensuration by the horizontal pattern of paper machine draws, is the effective ways of an evaluation paper machine performance.This method, provides enough accuracies and repetitive operation for the examination of paper making equipment and product index standard.The method that current paper industry adopts is exactly that cross direction ration is measured, transverse horizontal direction weighs the weight of sample in same straight line serial sampling by balance, by comparing the weight difference determination banner change of weighed sample, in this, as according to the change regulating each reference mark flow of head box, make it quantitatively reach cross direction ration always near what set as far as possible.The maximum shortcoming of the method can not feed back different time fluctuations in discharge in same region exactly, and Computer Analysis control is carried out to different time fluctuations in discharge, result floats wooden dipper by a cucurbit not reach quantitative difference of banner specialized range, and the product of production can not meet the quality standard of market demand.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a horizontal grammes per square metre defining method for paper machine, is characterized in that, comprising:
A, extract a predetermined number continuous print transverse direction page sample from the skin of parent roll cylinder;
B, to obtain horizontal page sample carry out pre-service;
C, based on pretreated horizontal outturn, analyze example weight, and utilize MD, the CD of the method determination respective sample of variance analysis, residue and total standard deviation.
2. the horizontal grammes per square metre defining method of paper machine according to claim 1, it is characterized in that, described step a, specifically comprises:
A1, to obtain according to needing of detecting paper roll complete before by the quantitative distribution copy of online scanner record so that afterwards test time contrast;
A2, according to detect needs, record the operating environment when gathered horizontal page sample collection;
A3, from the skin of the parent roll cylinder of diameter at least 1 meter presets the number of plies, cut a predetermined number continuous print, preset the horizontal page sample of longitudinal width.
3. the horizontal grammes per square metre defining method of paper machine according to claim 2, it is characterized in that, described step a3, comprises further:
Mark " FS " in the fore side corner of page, date, the time, paper roll numbering and paper machine numbering;
In the subsides net side of page mark " WS ";
From outermost one deck, by 1, in order each CD page is numbered.
4. the horizontal grammes per square metre defining method of the paper machine according to any one of claim 1-3, it is characterized in that, described step b, specifically comprises:
B1, the horizontal page sample obtained is cut into the rectangle pattern of default specification;
B2, based on default defect standard, remove defective rectangle pattern in the rectangle pattern that cuts into, obtain the sample meeting default criterion of acceptability;
B3, to removal defective rectangle pattern after gained sample, after carrying out constant temperature and humidity adjustment, weigh.
5. the horizontal grammes per square metre defining method of paper machine according to claim 4, it is characterized in that, described step b2, comprises further:
Use drying box, acceleration is carried out to the rectangle pattern cut into dry;
Use the smooth testing table surface of preset length, the page that will speed up the rectangle pattern after dry process launches, and layering is alignd;
Calculate the sample size that every page of needs cut, and the amount needing never sideline judge to fall; Sample needs continuous adjacent, predetermined width; Dismiss two ends predetermined amount, add the half of every page of trimming edge surplus;
Remove defective rectangle pattern in the rectangle pattern after above-mentioned cutting, obtain the sample meeting default criterion of acceptability.
6. the horizontal grammes per square metre defining method of the paper machine according to any one of claim 1-3, it is characterized in that, described step c, specifically comprises:
Use the method for two-way analysis of variance, the CD layer of assessment respective sample, calculate quadratic sum, degree of freedom, all square, F ratio, systematic variance, and calculate standard deviation, the residual sum total variation of CD and MD.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540726A (en) * | 2019-01-09 | 2019-03-29 | 江苏鸿凌达科技有限公司 | A kind of high-efficiency artificial graphene film discrimination method |
| CN117490812A (en) * | 2023-12-29 | 2024-02-02 | 常州宏大智慧科技有限公司 | Fabric width-direction gram weight deviation online detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013036821A (en) * | 2011-08-05 | 2013-02-21 | Toshiba Corp | Weight detection apparatus |
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2015
- 2015-06-25 CN CN201510357100.4A patent/CN104977071A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013036821A (en) * | 2011-08-05 | 2013-02-21 | Toshiba Corp | Weight detection apparatus |
Non-Patent Citations (5)
| Title |
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| 万永强等: "纸张定量测量结果不确定度的评定", 《黑龙江造纸》 * |
| 中国制浆造纸研究院: "《GB/T 10739-2002》", 1 January 2003 * |
| 中国制浆造纸研究院: "《GB/T 450-2008》", 1 December 2008 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540726A (en) * | 2019-01-09 | 2019-03-29 | 江苏鸿凌达科技有限公司 | A kind of high-efficiency artificial graphene film discrimination method |
| CN117490812A (en) * | 2023-12-29 | 2024-02-02 | 常州宏大智慧科技有限公司 | Fabric width-direction gram weight deviation online detection method |
| CN117490812B (en) * | 2023-12-29 | 2024-04-02 | 常州宏大智慧科技有限公司 | Fabric width-direction gram weight deviation online detection method |
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