Method for balancing moisture of reel type paper

Abstract

The invention discloses a reel type paper moisture balance method. The method comprises the steps that S1, a target moisture percentage is set, wherein the appropriate target moisture percentage is set according to the type and application of paper; s2, initial detection; s3, performing calculation; s4, paper is placed, specifically, the reel type paper is placed in the adjusted environment, and it is ensured that the paper makes full contact with the environment; and S5, environment temperature and humidity control: setting an environment temperature and humidity value, starting an automatic temperature and humidity control system, automatically feeding back and adjusting the environment temperature and humidity, and after a certain period of time, enabling the moisture content of the paper to reach a target value and keep stable. The invention belongs to the technical field of paper production, and achieves the technical effects that according to the reel type paper moisture balance method provided by the invention, the internal and external moisture balance of the paper is realized by scientifically placing the reel paper and accurately controlling environmental factors; therefore, the problem that water inside and outside the reel paper is unbalanced in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of paper production, and in particular to a method for balancing the moisture content of reel-type paper. Background Art

[0002] As an important material in the printing and packaging industries, the moisture balance of roll paper has a significant impact on product quality. Too high or too low moisture content will cause paper deformation, wrinkling, fragility and other problems, affecting production efficiency and product quality.

[0003] Therefore, how to achieve moisture balance of roll-type paper has always been a technical problem in the industry. The existing technology mostly adopts the method of environmental adjustment, but there are problems such as unstable adjustment effect and complicated operation. This patented technology aims to provide a more stable and efficient method for moisture balance of roll-type paper. Summary of the invention

[0004] To this end, the present invention provides a method for moisture balance of reel-type paper to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] According to a first aspect of the present invention, a method for moisture balance of reel-type paper comprises:

[0007] S1: Set target moisture percentage: Set the appropriate target moisture percentage according to the paper type and purpose;

[0008] S2: Initial test: Use a moisture meter to test the initial moisture percentage of roll paper;

[0009] S3: Calculation: Based on the difference between the initial moisture percentage and the target moisture percentage, apply the practical data to calculate the ambient temperature and humidity setting value to reach the target moisture and the time required for the roll paper to be placed in the environment;

[0010] S4: Place paper: Place the roll paper in a well-conditioned environment to ensure that the paper is in full contact with the environment;

[0011] S5: Ambient temperature and humidity control: Set the ambient temperature and humidity values, and turn on the temperature and humidity automatic control system to automatically feedback and adjust the ambient temperature and humidity. After a certain amount of time, the moisture content of the paper reaches the target value and remains stable.

[0012] Furthermore, the formula used in S3 to calculate the ambient temperature and humidity setting value to reach the target moisture content and the time required for the roll of paper to be placed in the environment is:

[0013] T=k(%MC initial -%MCtarget ) n ;

[0014] Where T is the time required to reach equilibrium, %MC initial is the initial moisture percentage, %MC target is the target moisture percentage, k and n are empirical parameters obtained from experimental data.

[0015] Furthermore, the empirical parameters k and n are recalculated using the linear regression formula:

[0016] Step 1: Transform the model: After taking the logarithm of both sides of the model, use linear regression techniques:

[0017] log(T)=log(k)+nlog(%MC initial -%MC target )

[0018] Use linear regression to estimate log(k) and n;

[0019] Step 2: Perform regression analysis: Use statistical software to perform regression analysis and obtain estimated values ​​of log(k) and n;

[0020] Step 3: Calculate k and n: From the log(k) and n values ​​obtained from the regression analysis, calculate the original value of k: k = 10 log (k) ;

[0021] Furthermore, the basis for the paper moisture content in S5 to reach the target value and remain stable is the adsorption isotherm model, specifically:

[0022]

[0023] Where %MC is the moisture content of the paper, RH is the relative humidity, a and b are temperature dependent parameters, T is the absolute temperature, R is the ideal gas constant, and E a and E b is the activation energy parameter, a0 and b0 are pre-factors.

[0024] Furthermore, the roll paper in S4 is placed in such a way that the core of the roll paper is passed through the crossbar to be hung with a certain interval so that the end surface of the roll paper is completely in contact with the environment.

[0025] Furthermore, the temperature and humidity automatic control system includes: a temperature and humidity meter, a sensor and an electronic controller, which are used to monitor and receive environmental data in real time, and start and stop the constant temperature and humidity equipment according to the set value and feedback value.

[0026] The present invention has the following advantages:

[0027] The present invention provides a method for balancing the moisture of roll-type paper, which achieves the moisture balance inside and outside the paper by scientifically placing the roll-type paper and accurately controlling the environmental factors, thereby solving the problem of unbalanced moisture inside and outside the roll-type paper in the prior art. The method adjusts the environmental temperature and humidity according to factors such as paper type, roll tightness, initial moisture percentage and target moisture percentage. The roll-type paper is placed in a set environment according to the method. After a certain amount of time, the moisture inside and outside the roll-type paper tends to be balanced and stable, and the target moisture requirement is achieved, so that the moisture adjustment method of the roll-type paper is simpler and easier to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flow chart of a method for moisture balance of roll-type paper provided in some embodiments of the present invention.

[0029] Figure 2 The present invention provides some embodiments of the present invention for the moisture balance experimental data of ordinary paper rolls.

[0030] Figure 3 The present invention provides some embodiments of the present invention for the roll-type paper moisture balance experimental data of the bright silver aluminum transfer paper.

[0031] Figure 4 The present invention provides some embodiments of the composite aluminum foil paper roll-type paper moisture balance experimental data.

[0032] Figure 5 The present invention provides some embodiments of the present invention for the transfer of aluminum paper roll type paper moisture balance experimental data.

[0033] Figure 6 Another data of the moisture balance experiment of ordinary paper roll provided by some embodiments of the present invention. DETAILED DESCRIPTION

[0034] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, a method for balancing moisture in a roll of paper in an embodiment of the first aspect of the present invention is as follows:

[0036] S1: Set target moisture percentage: Set the appropriate target moisture percentage according to the paper type and purpose;

[0037] S2: Initial test: Use a moisture meter to test the initial moisture percentage of roll paper;

[0038] S3: Calculation: Based on the difference between the initial moisture percentage and the target moisture percentage, apply Figures 2 to 6 Based on the practical (experimental) data in the paper, calculate the ambient temperature and humidity setting value to reach the target moisture content and the time required for the paper roll to be placed in this environment. The specific formula can be:

[0039] T=k(%MC initial -%MC target ) n ;

[0040] Where T is the time required to reach equilibrium, %MC initial is the initial moisture percentage, %MC target is the target moisture percentage, k and n are empirical parameters obtained from experimental data;

[0041] k and n can be recalculated using the linear regression formula:

[0042] Step 1: Transform the model: To use linear regression techniques, take the logarithm of both sides of the model:

[0043] log(T)=log(k)+nlog(%MC initial -%MC target )

[0044] Use linear regression to estimate log(k) and n;

[0045] Step 2: Perform regression analysis: Use statistical software (such as R, Python's SciPy, or MATLAB) to perform regression analysis and obtain estimates of log(k) and n.

[0046] Step 3: Calculate k and n: From the log(k) and n values ​​obtained from the regression analysis, calculate the original value of k: k = 10 log (k) .

[0047] Expanded dependence of paper moisture percentage on temperature and relative humidity using adsorption isotherm model:

[0048]

[0049] Where %MC is the moisture content of the paper, RH is the relative humidity, a and b are temperature dependent parameters, T is the absolute temperature, R is the ideal gas constant, and E a and E b is the activation energy parameter, a0 and b0 are pre-factors;

[0050] This model describes how the moisture content of paper changes with changes in ambient temperature and relative humidity;

[0051] S4: Place paper: Place the roll paper in a well-conditioned environment to ensure that the paper is in full contact with the environment;

[0052] S5: Ambient temperature and humidity control: Set the ambient temperature and humidity values, and turn on the temperature and humidity automatic control system to automatically feedback and adjust the ambient temperature and humidity. After a certain amount of time, the moisture content of the paper can reach the target value and remain stable.

[0053] Materials and Equipment

[0054] 1. Material: Reel-type paper is the main processing object, no special material requirements are required.

[0055] 2. Paper roll placement rack: used to pass the paper roll core through the rack cross arm for hanging, with a certain interval, so that the end surface of the paper roll is completely in contact with the environment.

[0056] 3. Equipment:

[0057] Environmental temperature and humidity control system: includes temperature and humidity meters, sensors and electronic controllers, etc., which are used to monitor and receive environmental data in real time, and start and stop constant temperature and humidity equipment according to set values ​​and feedback values ​​to keep the environmental temperature and humidity relatively stable.

[0058] Constant temperature and humidity equipment: used to adjust the ambient temperature and humidity.

[0059] Ventilation equipment: used to control environmental ventilation conditions.

[0060] Moisture meter: used to detect the moisture content of paper.

[0061] In the above embodiment, it should be noted that when batch drying roll paper, the number of roll paper is large, and the environment is generally a large indoor environment. Adjusting the air pressure in a large indoor environment is costly and inefficient, so the effect of ambient air pressure on paper is not considered.

[0062] The technical effects achieved by the above embodiments are:

[0063] 1. Ensure stable product quality: The ambient temperature and humidity are kept relatively stable through the ambient temperature and humidity control system. The two end surfaces of the reel are adjusted in the same environment to ensure that the paper does not deform during the moisture balance process, thus ensuring the stability of product quality.

[0064] 2. Easy operation: According to the difference between the initial moisture percentage and the target moisture percentage, the ambient temperature and humidity setting values ​​and the time required to reach the target moisture are calculated. After setting the ambient temperature and humidity values, there is no need to frequently adjust the environmental parameters manually, which reduces the difficulty of operation and labor costs.

[0065] 3. Easy to plan and schedule: According to the difference between the initial moisture percentage and the target moisture percentage, the time required for moisture balance can be calculated, and planning and production scheduling can be carried out in advance, which is convenient for production coordination and ensuring production efficiency.

Claims

1. A method for moisture balance of reel-type paper, characterized in that: include: S1: Set target moisture percentage: Set the appropriate target moisture percentage according to the paper type and purpose; S2: Initial test: Use a moisture meter to test the initial moisture percentage of roll paper; S3: Calculation: Based on the difference between the initial moisture percentage and the target moisture percentage, apply the practical data to calculate the ambient temperature and humidity setting value to reach the target moisture and the time required for the roll paper to be placed in the environment; S4: Place paper: Place the roll paper in a well-conditioned environment to ensure that the paper is in full contact with the environment; S5: Ambient temperature and humidity control: Set the ambient temperature and humidity values, and turn on the temperature and humidity automatic control system to automatically feedback and adjust the ambient temperature and humidity. After a certain amount of time, the moisture content of the paper reaches the target value and remains stable.

2. A method for moisture balance of reel-type paper according to claim 1, characterized in that: The formula used in S3 to calculate the ambient temperature and humidity setting value to reach the target moisture content and the time required for the reel paper to be placed in this environment is: T=k(%MC initial -%MC target ) n ; Where T is the time required to reach equilibrium, %MC initial is the initial moisture percentage, %MC target is the target moisture percentage, k and n are empirical parameters obtained from experimental data.

3. The method for moisture balance of reel-type paper according to claim 2, characterized in that: The empirical parameters k and n are recalculated using the linear regression formula: Step 1: Transform the model: After taking the logarithm of both sides of the model, use linear regression techniques: log(T)=log(k)+nlog(%MC initial -%MC target ) Use linear regression to estimate log(k) and n; Step 2: Perform regression analysis: Use statistical software to perform regression analysis and obtain estimated values ​​of log(k) and n; Step 3: Calculate k and n: From the log(k) and n values ​​obtained from the regression analysis, calculate the original value of k: k = 10 log(k) .

4. The method for moisture balance of reel-type paper according to claim 1, characterized in that: The basis for the paper moisture content in S5 to reach the target value and remain stable is the adsorption isotherm model, specifically: Where %MC is the moisture content of the paper, RH is the relative humidity, a and b are temperature dependent parameters, T is the absolute temperature, R is the ideal gas constant, and E a and E b is the activation energy parameter, a0 and b0 are pre-factors.

5. The method for moisture balance of reel-type paper according to claim 1, characterized in that: The roll paper in S4 is placed in such a way that the core of the roll paper is passed through the crossbar to be hung with a certain interval so that the end surface of the roll paper is completely in contact with the environment.

6. The method for moisture balance of reel-type paper according to claim 1, characterized in that: The temperature and humidity automatic control system includes: a temperature and humidity meter, a sensor and an electronic controller, which are used to monitor and receive environmental data in real time, and start and stop constant temperature and humidity equipment according to set values ​​and feedback values.

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