CN102721608A - Test method for tensile strength of tobaccos reconstituted by papermaking method - Google Patents

Abstract

The invention relates to a test method for tensile strength of tobaccos reconstituted by a papermaking method, belonging to the technical field of testing of physical indexes of reconstituted tobaccos. The test method comprises the following steps of: preparing samples: preparing test samples from each uncut sample along the longitudinal direction and the horizontal direction of a paper web, testing the samples, cutting 10 rectangular long strips being 200mm*15mm, cutting rectangular long strips being 40mm*15mm, and selecting 30 complete long strips from one sample; correcting and adjusting an instrument; testing the tensile strength: adjusting the extension rate of the instrument to be 50mm/min plus or minus 0.5mm/min when the instrument is used for testing the tensile strength of the large samples, and adjusting the extension rate of the instrument to be 200mm/min plus or minus 0.5mm/min when the instrument is used for testing the tensile strength of the small samples; and calculating according to test results of the tensile strength, wherein the calculation result reserves two decimal fractions. The method disclosed by the invention has the advantages of safety, simplicity, convenience, accuracy and precision, and the tested indexes of the tobaccos reconstituted by the papermaking method can represent the physical properties of the tobaccos reconstituted by the papermaking method.

Description

A kind of assay method of papermaking-method reconstituted tobaccos tensile strength

Technical field:

The present invention relates to a kind of method of measuring the papermaking-method reconstituted tobaccos tensile strength, belong to the reconstituted tobacco physical index and measure the field.

Background technology:

Tensile strength refers to that under the test method defined terms, the maximum tension that can bear before the sample fracture of unit width is represented with kN/m.

Papermaking-method reconstituted tobaccos should possess certain tensile strength; Because of needs satisfy the coated technology in later stage, thus require the sheet base to have certain tensile strength, but tensile strength is not high more good more; Too high tensile strength is unfavorable for follow-up chopping operation, so as long as satisfy paper machine making.

At present; Domestic less to papermaking-method reconstituted tobaccos tensile strength study on determination method; Have only YC/T 16.3-2003 " papermaking-method reconstituted tobaccos the 3rd part: paper process " standard only some physical and chemical indexs of papermaking-method reconstituted tobaccos product to be carried out simple regulation; The detection of most physical indexs is the GB detection methods that adopt paper and cardboard, and majority is that requirement working sample length and width are bigger in the GB detection method of paper and cardboard, and the papermaking-method reconstituted tobaccos finished product all is the sample of small pieces at present; Therefore, it is obviously improper to indiscriminately imitate the detection method of paper and cardboard.In addition; Papermaking-method reconstituted tobaccos is different from paper and tobacco leaf; The measurement range of its tensile strength and paper and tobacco leaf have than big difference especially; Therefore, be necessary to explore a kind of tensile strength assay method that is applicable to papermaking-method reconstituted tobaccos, for the tensile strength of assay reconstituted tobacco provides certain reference.

Through the document retrieval, do not see the public reported identical with the present invention.

Summary of the invention:

The object of the present invention is to provide a kind of safe, easy, accurate and accurate method of measuring the papermaking-method reconstituted tobaccos tensile strength, characterize the physical features of reconstituted tobaccos through these indexs.

The concrete steps of mensuration papermaking-method reconstituted tobaccos method of the present invention are following:

(1) preparation of sample

A. to measuring without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not, perhaps papermaking-method reconstituted tobaccos sheet base requires to prepare sample respectively along vertical, the transverse direction of paper web; Choose no any damage, the position of no watermark, folding line, 15mm cuts with cutting means with the upper part and gets the rectangular rectangular of 10 200mm * 15mm at the sample edge;

B. mensuration is cut or is beaten the papermaking-method reconstituted tobaccos finished product behind the leaf, cut into the rectangular rectangular of 40mm * 15mm with cutting means, sample choose 30 intact rectangular;

C. two of sample limits should be straight, and its depth of parallelism should be within ± 0.1mm, and otch is neat, does not have any damage, no watermark, folding line;

C. above-mentioned sample is 22 ℃ ± 1 ℃ in temperature, and relative humidity is balance 48h in 60% ± 3% the climatic chamber;

(2) calibration of instrument and adjusting

Basically calibrate and regulate according to conventional method, wherein:

A. measure without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not, perhaps papermaking-method reconstituted tobaccos sheet basic pattern article are regulated clip position and are made test length, and promptly the mean distance between clamp is 100mm scholar 1mm; The papermaking-method reconstituted tobaccos finished product behind the leaf is cut or beaten to mensuration, regulates clip position and make test length, and promptly the mean distance between clamp is 20mm scholar 1mm; The thin aluminium foil of a slice is clipped between two chucks, measures the distance between two marks that thin aluminium foil produces because of clamping, and check measured length whether accurate with this;

B. measure without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not, perhaps papermaking-method reconstituted tobaccos sheet base, the rate of extension of adjustment instrument is to 50mm/min scholar 0.5mm/min; The papermaking-method reconstituted tobaccos finished product behind the leaf is cut or beaten to mensuration, and the rate of extension of adjustment instrument is to 200mm/min scholar 0.5mm/min; Regulate clamp pressure, make sample not only not have slippage but also not damaged;

(3) mensuration of tensile strength

Under the test atmospheric environment of GB/T1644 regulation, sample is tested;

A. measure the papermaking-method reconstituted tobaccos sample of not cutting, the rate of extension of adjustment instrument is to 50mm/min scholar 0.5mm/min; Measure the papermaking-method reconstituted tobaccos finished product, the rate of extension of adjustment instrument is to 200mm/min scholar 0.5mm/min;

B. chuck is adjusted to the test length of regulation, length value, the width value of input sample clamp sample on chuck, guarantee that sample is parallel to the tension direction that is applied, and carry out tension stress zero clearing and displacement zero clearing;

C. directly read stretch at breaking point and tension stress from instrument;

D. measure without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not; Perhaps papermaking-method reconstituted tobaccos sheet basic pattern article; Requirement is vertical, transverse direction is measured 10 samples respectively, and the net result of a sample is measured results' arithmetic mean value representation respectively with 10 samples, and numerical value is represented with N;

E. measure the papermaking-method reconstituted tobaccos finished product cut or beat behind the leaf, require to measure 30 samples, the net result of a sample is with 30 samples mensuration results' arithmetic mean value representation, and numerical value is represented with N;

(4) the tensile strength S of sample calculates by formula (1): numerical value representes that with kN/m the result remains to two-decimal;

$S=\frac{\stackrel{\‾}{F}}{W}...\left(1\right)$

In the formula:

S-sample tensile strength, kN/m;

-sample mean tension stress, N;

The W-specimen width, mm.

That method of the present invention has is safe, easy, accurately reach accurate advantage, and the papermaking-method reconstituted tobaccos tensile strength index of mensuration can characterize the physical characteristics of reconstituted tobacco.

Embodiment:

The concrete steps that the method for mensuration papermaking-method reconstituted tobaccos tensile strength of the present invention is partly described by summary of the invention are carried out.

1. experimental cultivar is to get the different representative papermaking-method reconstituted tobaccos sample of not cutting (being entrusted the sample of external processing by domestic certain enterprise), is designated as A1 respectively, A2; A3, B1, B2; B3, C1, C2 and the papermaking-method reconstituted tobaccos sample (product of domestic certain reconstituted tobacco manufacturing enterprise) of cutting; Be designated as D1 respectively, D2, D3.

2. test apparatus: the observing and controlling of KW-3 computer resists strong strength-testing machine (the Changjiang river, Sichuan papermaking instrument Ltd); Standard hand papercutter (the Changjiang river, Sichuan papermaking instrument Ltd).

3. the result of tensile strength method; Through the papermaking-method reconstituted tobaccos sample that 7 are not cut; Press the said determination method, 10 rectangular tensile strength longitudinally of each sample determination, table 1 is that the statistic of the papermaking-method reconstituted tobaccos sample of not cutting (folder is apart from 100mm) machine direction tensile strength is described.Can find out that 7 sample tensile strength determination data RSD explain that below 25% this method is more stable; Data rationally, effectively; To compare RSD less with tobacco leaf, and also from this angle explanation of tensile strength, papermaking-method reconstituted tobaccos and tobacco leaf have tangible difference.

The statistic of the papermaking-method reconstituted tobaccos sample that table 1 is not cut (folder is apart from 100mm) machine direction tensile strength is described

Table 2 is the papermaking-method reconstituted tobaccos samples of not cutting, and the folder distance is the mensuration result of the cross direction tensile strength of 100mm, and these data have been carried out the statistic description.Find out in the table that the data RSD of mensuration explains that below 26% this method is more stable, data rationally effectively.Compare with table 1, cross direction tensile strength is significantly less than machine direction tensile strength.

The statistic of the papermaking-method reconstituted tobaccos sample that table 2 is not cut (folder is apart from 100mm) cross direction tensile strength is described

Because the length and width of papermaking-method reconstituted tobaccos finished product are significantly less than paper, thus can not blindly indiscriminately imitate the assay method of paper, because find that according to test repeatedly scope and paper, the tobacco leaf of the tensile strength of papermaking-method reconstituted tobaccos finished product have evident difference.So, be provided with folder distance: 20mm, 30mm according to actual conditions; Be provided with 2 rate of extension: 50mm/min, 200mm/min; The test design of different folder distances and rate of extension 4 processing: press from both sides apart from 20mm-rate of extension 50mm/min (being abbreviated as 20-50); Folder is apart from 20mm-rate of extension 200mm/min (being abbreviated as 20-200); Folder is apart from 30mm-rate of extension 50mm/min (being abbreviated as 30-50); Folder is apart from 30mm-rate of extension 200mm/min (being abbreviated as 30-200).The statistic of the papermaking-method reconstituted tobaccos finished product tensile strength of 4 processing is described, like table 3.The result shows that 20-200 measures result's RSD minimum, and therefore selected folder is apart from 20mm, and rate of extension 200mm/min is the test condition of mensuration papermaking-method reconstituted tobaccos tensile strength.

The statistic of table 3 papermaking-method reconstituted tobaccos finished product tensile strength is described

Find out that from table 1,2 and 3 as a result the method provides certain reference in the time of spending for the tensile strength of papermaking-method reconstituted tobaccos workers test sample, has also established certain basis for the work of carrying out related fields from now on.

Claims (1)

1. method of measuring the papermaking-method reconstituted tobaccos tensile strength, the concrete steps that it is characterized in that measuring the papermaking-method reconstituted tobaccos tensile strength are following:

(1) preparation of sample

A. to measuring without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not, perhaps papermaking-method reconstituted tobaccos sheet base requires to prepare sample respectively along vertical, the transverse direction of paper web; Choose no any damage, the position of no watermark, folding line, 15 mm cut with cutting means with the upper part and get the rectangular rectangular of 10 200 mm * 15 mm at the sample edge;

B. mensuration is cut or is beaten the papermaking-method reconstituted tobaccos finished product behind the leaf, cut into the rectangular rectangular of 40 mm * 15 mm with cutting means, sample choose 30 intact rectangular;

C. two of sample limits should be straight, and its depth of parallelism should be within ± 0.1 mm, and otch is neat, does not have any damage, no watermark, folding line;

D. above-mentioned sample is 22 ℃ ± 1 ℃ in temperature, and relative humidity is balance 48 h in 60% ± 3% the climatic chamber;

(2) calibration of instrument and adjusting

Basically calibrate and regulate according to conventional method, wherein:

A. measure without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not, perhaps papermaking-method reconstituted tobaccos sheet basic pattern article are regulated clip position and are made test length, and promptly the mean distance between clamp is 100 mm scholars, 1 mm; The papermaking-method reconstituted tobaccos finished product behind the leaf is cut or beaten to mensuration, regulates clip position and make test length, and promptly the mean distance between clamp is 20 mm scholars, 1 mm; The thin aluminium foil of a slice is clipped between two chucks, measures the distance between two marks that thin aluminium foil produces because of clamping, and check measured length whether accurate with this;

B. measure without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not perhaps papermaking-method reconstituted tobaccos sheet base, rate of extension to 50 mm/min scholar 0.5 mm/min of adjustment instrument; The papermaking-method reconstituted tobaccos finished product behind the leaf is cut or beaten to mensuration, rate of extension to 200 mm/min scholar 0.5 mm/min of adjustment instrument; Regulate clamp pressure, make sample not only not have slippage but also not damaged;

(3) mensuration of tensile strength

Under the test atmospheric environment of GB/T1644 regulation, sample is tested;

A. measure the papermaking-method reconstituted tobaccos sample of not cutting, rate of extension to 50 mm/min scholar 0.5 mm/min of adjustment instrument; Measure the papermaking-method reconstituted tobaccos finished product, rate of extension to 200 mm/min scholar 0.5 mm/min of adjustment instrument;

B. chuck is adjusted to the test length of regulation, length value, the width value of input sample clamp sample on chuck, guarantee that sample is parallel to the tension direction that is applied, and carry out tension stress zero clearing and displacement zero clearing;

C. directly read stretch at breaking point and tension stress from instrument;

D. measure without cutting or the papermaking-method reconstituted tobaccos sample of economy-combat leaf not; Perhaps papermaking-method reconstituted tobaccos sheet basic pattern article; Requirement is vertical, transverse direction is measured 10 samples respectively, and the net result of a sample is measured results' arithmetic mean value representation respectively with 10 samples, and numerical value is represented with N;

E. measure the papermaking-method reconstituted tobaccos finished product cut or beat behind the leaf, require to measure 30 samples, the net result of a sample is with 30 samples mensuration results' arithmetic mean value representation, and numerical value is represented with N;

(4) the tensile strength S of sample calculates by formula (1): numerical value representes that with kN/m the result remains to two-decimal;

$S=\frac{\stackrel{}{\stackrel{\¯}{F}}}{W}\·\·\·\left(1\right)$

In the formula:

S-sample tensile strength, kN/m;

-sample mean tension stress, N;

W-specimen width, mm.