CN111184253B - Method for selecting specification of tows for fine filter stick - Google Patents
Method for selecting specification of tows for fine filter stick Download PDFInfo
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- CN111184253B CN111184253B CN201811355813.7A CN201811355813A CN111184253B CN 111184253 B CN111184253 B CN 111184253B CN 201811355813 A CN201811355813 A CN 201811355813A CN 111184253 B CN111184253 B CN 111184253B
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- filter stick
- tow
- tows
- filter
- pressure drop
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0229—Filter rod forming processes
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
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- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
Hair brushObviously, the method for selecting the specification of the tows for the fine filter stick is provided, the tows for 7 specification fine filter sticks are selected, and an index equation between the pressure drop and each factor is constructed by using a multiple linear regression method: Δ P = e17.5C‑6.28W2.11δ‑0.751T‑0.214L/120, providing a guide for selecting the specification of the fine filter stick tows. The equation is adopted to carry out data analysis after the parameters of various tows are measured and calculated, and the regression equation is obviously and effectively judged as a whole; the fine filter stick can quickly select the tow specification according to the required pressure drop or filtering efficiency, thereby reducing the complicated test and calculation work.
Description
Technical Field
The invention relates to a method for selecting tows for a filter stick.
Background
In recent years, the market of fine cigarettes is expanding and the brand of the fine cigarettes is rich, the requirements of various cigarette enterprises on the fine filter sticks with different pressure drops are diversified day by day, and the quality requirements on the fine filter sticks are continuously improved. Previously, the tow specification suitable for the production of the fine filter stick in China is small, so that the pressure drop selection interval of the fine filter stick in China is narrow, and with the introduction of higher single-denier tow in China and the production research and development of tow manufacturers in China, the tow product specification for the fine filter stick is gradually enriched, and the pressure drop selection range of the fine filter stick is expanded. In order to better promote the steady development of the ramuscule cigarettes and continuously improve the product quality, the research on the selection of the ramuscule filter rod tows has greater practical significance and stronger urgency.
The filtering efficiency of the filter to tar in smoke depends on the physical characteristics of the type of filter element materials, the internal structure of the filter and the like. The key of filter design lies in that the proper specification of the tows is selected to meet the basic requirements of the cigarette on the filter such as the suction resistance, the filtration efficiency, the hardness, the circumference and the like, and the selection of the specification of the tows is directly related to the basic performance of the manufactured filter.
2001(9) tobacco science and technology (P6-8) discloses technical research on selection of tow specification in acetate filter design, which analyzes the influence of tow specification on characteristic curve and the correlation between tow specification and filter efficiency and provides a specific idea for selecting tow specification in filter. . 2003(10) tobacco science P9-12 discloses "correlation between physical parameters of filter rods", and studies the correlation between the four elements of filter rod circumference, weight, hardness and suction resistance.
At present, literature reports about the fine filter stick mainly focus on the research and modification of a cigarette making machine, research reports about the specification selection of the tows of the fine filter stick are not found, and meanwhile, the tow selection software of the conventional common filter stick has little guiding effect on the design and the tow selection of the fine filter stick.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides a method for selecting the specification of a fine branch tow, which can quickly select the type of the tow without repeated tests.
The technical scheme is as follows:
the invention relates to a method for selecting the specification of tows for a fine filter stick, which is applied to the production of the fine filter stick and comprises the following sequential operation steps:
1) selecting diacetate tows of different specifications (at least four are selected according to the single denier of the tows and the total denier of the tows T, and utilizing the internal corresponding relation of the single denier and the total denier of the tows provided by a conventional tow manufacturer so as to calculate 5 constants in the step 5);
2) the test is carried out under the conditions of the same KDF2 forming machine, the vehicle speed of 300m/min and the same process parameters: closing a glyceryl triacetate and inner bonding wire applying device (preventing additives such as a binder and the like from influencing a test result), and respectively manufacturing various filter sticks on a filter stick forming machine according to the filter stick circumference C, the length L and the tow filling amount W of the design requirements;
3) detecting the pressure drop delta P of the various filter sticks in the step 2) by referring to a method specified by the national standard of GB/T5605-2011 acetate fiber filter stick;
4) preparing a data comparison table from several groups of data of pressure drop delta P, tow filling quantity W, tow single denier delta, tow total denier T, filter stick circumference C and length L;
5) using a multiple linear regression method, an exponential equation between the pressure drop and each factor was constructed as follows:
△P=bCa1Wa2δa3 Ta4 L/120； （1）
in the formula: delta P is the pressure drop of the filter stick, unit Pa;
c, the circumference of the filter stick is in unit mm;
w is the filling amount of the tows, and the unit is mg/branch;
delta-filament denier of tow, unit g/9X 103m；
T-total denier of tow, unit g/9X 103m；
L is the length of the filter stick, unit mm;
b、a1、a2、a3、a4are different constants.
6) Substituting the data in the data comparison table in 4) into the following converted multivariate linear equation in 2), and obtaining b and a through mathematical operation1、a2、a3、a4The value of the different constants.
The calculation is as follows:
taking natural logarithm on both sides of equation (1), let y = In Δ P, x1=InC，x2=InW，x3=Inδ，x4=InT，x5=In(L/120)，a0= Inb, converted to a linear equation:
Y=a0+a1X1+a2X2+a3X3+a4X4+X5， （2）
namely substituting the data in the step 4), calculating and obtaining b and a1、a2、a3、a4Numerical values.
In the present invention, the denier per denier δ and total denier T of the cellulose diacetate tow is preferably one of the following common specification: 6.0Y15000, 6.0Y17000, 6.0Y18000, 7.5Y16000, 8.0Y15000, 9.5Y12000, 11.0Y 15000.
For the preferred tow specification, by substituting the constants b, a1, a2, a3 and a4 through testing and computational analysis, the regression equation obtained is as follows:
Y = 17.5 - 6.28 X1 + 2.11 X2 - 0.751 X3 - 0.214 X4， （3）
substituting the constants and the factor coefficients in the formula (3) into the formula (1), preferably constructing a model of pressure drop and the factor coefficients (exponential equation) as follows:
△P=e17.5C-6.28W2.11δ-0.751T-0.214L / 120， （4）
according to the invention, the following more specific guide for selecting the type specification of the fine filter stick tows can be formed:
firstly, preliminarily determining the technical index requirements of the filter stick and the specification range of the tows. The filter rod has the advantages that the single denier of the tows, the length of the filter tip, the circumference and the pressure drop of the filter tip directly influence the smoke filtering efficiency, the circumference and the pressure drop of the filter tip are determined by comprehensively considering other factors such as equipment resources and the like according to the design requirements of the cigarette, the circumference and the length of the filter tip and the range of the filter tip pressure drop are substituted into the circumference and the length of the filter tip and the filtering efficiency of the filter tip into a smoke filtering empirical equation, the range of the single denier of the tows and the range of the filter tip pressure drop are obtained through preliminary calculation, if the filter efficiency of the fine-count cigarette is high, the filter rod with long length of the filter tip, high pressure drop of the filter tip and small single denier of the tows can be selected, and meanwhile, the condition that the sense evaluation is not good due to overhigh pressure drop is considered.
And secondly, screening a proper tow specification. According to the length value of the filter tip obtained in the step 1, comprehensively considering factors such as equipment resources and the like, and determining the length value of the filter stick; and (3) listing the required filament bundle specifications by contrasting the existing filament bundle specification table according to the initially determined filament bundle single denier range in the step 1, substituting the circumference, the length, the filament bundle single denier and the total denier of the filter rod into a filter rod pressure drop model, and drawing characteristic curve graphs of different filament bundles by taking the filament bundle filling amount as a horizontal coordinate and the filter rod pressure drop as a vertical coordinate. Marking the initially determined pressure drop range in the step 1 in a tow characteristic curve graph, preferably selecting the tows (namely 15-50% of the length of the characteristic curve) which are pressed and dropped in the optimal forming interval of the characteristic curve, and finally screening the appropriate tow specifications by comprehensively considering factors such as tow filling amount, filter stick hardness, pressure drop stability and the like.
And thirdly, trial production of the filter stick. And (4) substituting the determined filter rod pressure drop, length, circumference, single denier of the tows and total denier into a pressure drop model of the fine filter rod to obtain the tow filling amount, estimating the weight of the filter rod, and performing trial production of the filter rod.
Has the advantages that:
the guide for selecting the type and specification of the filter tow of the fine filter stick formed by the index equation constructed by the invention can guide the model of the tow to be quickly selected in the production practice without repeated test, thereby achieving the advantages of meeting the design requirement of cigarettes, ensuring that the quality of the filter stick meets the standard, saving labor, reducing the waste of raw material tests and ensuring that the filter stick is more economical to produce. And moreover, the method can be popularized, and when a raw material manufacturer produces a new tow specification, the formula can be directly applied to calculate the pressure drop of the filter stick, and the parameters such as the smoke filtering efficiency and the like of the filter stick can be obtained.
Drawings
FIG. 1 is a schematic representation of the tow characteristics of a fine count filter rod according to the invention for different tow types.
Detailed Description
Example 1:
the selection method of the filament bundle specification for the fine filter stick adopted by the invention comprises the following sequential operation steps:
1) selecting the following 5 different specifications of diacetate fiber tows according to the single denier number delta and the total denier number T of the tows: 6.0Y17000, 7.5Y16000, 8.0Y15000, 9.5Y12000, 11.0Y 15000;
2) under the conditions of the same KDF2 forming machine, the vehicle speed of 300m/min and the same process parameters, closing a glyceryl triacetate applying device on the filter stick forming machine, and respectively preparing 5 filter sticks on the filter stick forming machine according to the filter stick circumference C, the filter stick length L (the filter stick length is unified to be 120 mm) and the tow filling amount W which are required by design;
3) detecting the pressure drop delta P of the various filter sticks in the step 2) by referring to a method specified in GB/T5605-2011;
4) several groups of data of pressure drop delta P, tow filling quantity W, tow single denier delta, tow total denier T, filter stick circumference C and length L are recorded correspondingly in sequence to make a data comparison table, which is shown in columns 1-6 of the table 1;
5) and (3) constructing an exponential equation between the pressure drop and each factor by using a multiple linear regression method, and calculating to obtain the following equation:
△P=e17.5C-6.28W2.11δ-0.751T-0.214l/120, calculated to obtain column 7 in Table 1, respectively.
TABLE 1 model verification data
As can be seen from the comparison between the measured value and the calculated value of Δ P in Table 1, the degree of structural coincidence is quite high, and the exponential equation of the present invention is proved to have basic correctness and small error.
Example 2:
on the basis of the embodiment 1, test research of two tows 6.0Y15000 and 6.0Y18000 is additionally carried out, the same circumference of 16.70mm and the same length of 120mm are adopted, the tow amount W is corrected, two groups of data are obtained by similar measurement processing, and the data of the tows with 7 specifications can be obtained altogether, and tow characteristic curves with 7 specifications can be made, which is shown in the attached figure 1. )
Moreover, as can be seen from fig. 1, the filter rods have the same circumference, the same filament bundles have the same single denier δ (6.0Y 15000, 6.0Y17000 and 6.0Y 18000), and the larger the total denier T is, the higher the filter rod pressure drop interval is; under the same tow filling amount W, the larger the tow total denier T is, the smaller the pressure drop Delta P of the filter stick is.
Claims (3)
1. A method for selecting the specification of tows for a fine filter stick is applied to the production of the fine filter stick and is characterized in that: having the following sequence of operational steps:
1) selecting diacetate fiber tows of various specifications according to the single denier number delta and the total denier number T of the tows;
2) closing a glycerol triacetate applying device on the filter stick forming machine, and respectively manufacturing various filter sticks on the filter stick forming machine according to the filter stick circumference C, the filter stick length L and the tow filling amount W which are required by the design;
3) detecting the pressure drop delta P of the various filter sticks in the step 2) by referring to a method specified in GB/T5605-2011;
4) preparing a data comparison table from several groups of data of pressure drop delta P, tow filling quantity W, tow single denier delta, tow total denier T, filter stick circumference C and length L;
5) using a multiple linear regression method, an exponential equation between the pressure drop and each factor was constructed as follows:
△P＝bCa1Wa2δa3Ta4L/120 (1)
in the formula: delta P is the pressure drop of the filter stick, unit Pa;
c, the circumference of the filter stick is in unit mm;
w is the filling amount of the tows, and the unit is mg/branch;
delta-filament denier of tow, unit g/9X 103m；
T-total denier of tow, unit g/9X 103m；
L is the length of the filter stick, unit mm;
b. a1, a2, a3 and a4 are different constants;
6) according to the data in the data comparison table in 4), the values of different constants of b, a1, a2, a3 and a4 are obtained through the following mathematical operations:
the natural logarithm on both sides of formula (1) is obtained, and y ═ In Δ P, x1 ═ InC, x2 ═ InW, x3 ═ In δ, x4 ═ InT, x5 ═ In (L/120), a0 ═ Inb, is converted into the linear equation:
y＝a0+a1x1+a2x2+a3x3+a4x4+x5
substituting the data in the data comparison table in the step 4) into the above formula to calculate and obtain the values of b, a1, a2, a3 and a 4.
2. The method of selecting a tow size for a fine filter according to claim 1, wherein: 1) the single denier delta and the total denier T of the medium diacetate fiber tows are one of the following specifications: 6.0Y15000, 6.0Y17000, 6.0Y18000, 7.5Y16000, 8.0Y15000, 9.5Y12000, 11.0Y 15000.
3. A method of selecting a size of a tow for a fine filter according to claim 1 or 2, wherein: 5) the exponential equation between the pressure drop and each factor is constructed as follows:
△P＝e17.5C-6.28W2.11δ-0.751T-0.214L/120。
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