Leather softening processing method

Abstract

The invention relates to the technical field of leather processing, and in particular to a leather softening processing method, comprising: obtaining bare hides after dehairing and degreasing raw hides; determining whether processing of the bare hides meets preset standards according to a bare hide quality evaluation value; stirring and rotating the bare hides that meet the preset standards in a rotary drum to obtain macerated leather; increasing the softener content in the rotary drum when determining that processing of the macerated leathers does not meet the preset standards according to a penetration uniformity characteristic value, or determining whether processing of the macerated leathers meets the preset standards for the second time according to a softness characteristic value; placing the macerated leathers that meet the preset standards in an oscillating stretching machine for oscillation stretching to obtain leather; determining whether processing of the leathers meets the preset standards according to a bending rebound characteristic value; grinding and drying the leathers that meet the preset standards to obtain softened leather, thereby improving leather softening processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of leather processing, in particular to a leather softening processing method. Background Art

[0002] Leather softening is a crucial step in the tanning process, designed to soften the leather, smooth the grain, and improve its sensory properties, breathability, and hygiene. This step is crucial to the manufacture and quality of leather products. Leather softening can be performed using both physical and chemical methods. Physical methods primarily alter the leather's softness through mechanical action and temperature control, while chemical methods primarily soften the leather by adding softeners to alter its chemical structure.

[0003] Chinese Patent Publication (Announcement) No. CN115044714B discloses a leather softening system comprising a base and a housing, wherein a housing is fixedly mounted on the upper end surface of the base, wherein the housing contains a soaking liquid, wherein an outer cylinder is fixedly mounted on the housing, wherein an outer surface upper end of the outer cylinder is provided with a feed inlet, and a cylinder cover is hingedly mounted at the feed inlet, wherein a drive mechanism is provided on the rear end surface of the outer cylinder, wherein a squeezing mechanism is provided at the inner center of the outer cylinder, and the drive mechanism is connected to the squeezing mechanism, and an adjustment assembly is provided between the squeezing mechanism and the inner bottom end of the outer cylinder. By providing the drive mechanism, squeezing mechanism, and adjustment assembly in the device, the drive mechanism cooperates with the squeezing mechanism and the adjustment assembly to squeeze the leather placed in the squeezing mechanism. The leather is repeatedly squeezed in the soaking liquid for a certain period of time, thereby better absorbing the liquid in the soaking liquid and achieving an excellent soaking and softening effect. It can be seen that the prior art softening of leather is only performed by physical squeezing and soaking, and the softening process parameters of the leather cannot be adjusted accordingly according to the difference in the softening quality of the leather, resulting in poor leather softening process efficiency. Summary of the Invention

[0004] To this end, the present invention provides a leather softening processing method to overcome the problem that the softening of leather in the prior art is only physical squeezing and soaking and the softening processing parameters of the leather cannot be adjusted accordingly according to the differences in leather conversion quality characteristics, thereby resulting in poor leather softening processing efficiency.

[0005] To achieve the above object, the present invention provides a leather softening method, comprising:

[0006] Step S1, adding a depilatory agent into a rotary drum and placing a raw hide, starting the drum to depilate the raw hide under the action of the depilatory agent; after the drum rotates for a preset depilation time, adding a degreasing agent into the drum, and after the drum rotates for a preset degreasing time, draining and washing the raw hide to obtain a bare hide;

[0007] Step S2, obtaining the fur area ratio and the oil content of the bare skin, obtaining a bare skin quality evaluation value, and determining whether the processing of the bare skin meets the preset standard according to the bare skin quality evaluation value;

[0008] Step S3, adding the bare leather that meets the preset standards into a drum containing a softener and stirring and rotating it, and obtaining the macerated leather after a preset softening time;

[0009] Step S4, setting a plurality of sampling points on the surface of the macerated leather, obtaining the hardness of each sampling point, and calculating a penetration uniformity characteristic value. If it is determined based on the penetration uniformity characteristic value that the macerated leather processing does not meet the preset standard, the softener content in the drum is increased, or, based on the softness characteristic value, a second determination is made as to whether the macerated leather processing meets the preset standard.

[0010] Step S5, placing the macerated leather that meets the preset standards into an oscillating stretching machine for oscillation stretching to obtain leather; obtaining a bending and rebound characteristic value of the leather, and determining whether the processing of the leather meets the preset standards based on the bending and rebound characteristic value;

[0011] Step S6: buffing and drying the leather that meets the preset standards to obtain softened leather.

[0012] Furthermore, the process of determining whether the processing of the bare skin does not meet the preset standard according to the bare skin quality evaluation value includes:

[0013] Comparing the bare skin quality evaluation value with the preset bare skin quality threshold;

[0014] If the bare skin quality evaluation value is less than the preset bare skin quality threshold, it is determined that the processing of the bare skin does not meet the preset standard, and the dehairing time and degreasing time of the drum are synchronously increased according to the difference between the bare skin quality evaluation value and the preset bare skin quality threshold;

[0015] The bare skin quality evaluation value is determined based on the hair area ratio and the oil content of the bare skin.

[0016] Furthermore, several time adjustment methods are provided for the synchronous increase of the depilatory time and the degreasing time of the drum, wherein:

[0017] If the bare skin quality difference is less than a first preset bare skin quality difference, the first time adjustment coefficient is used to synchronously increase the dehairing time and the degreasing time of the drum;

[0018] If the bare skin quality difference is greater than or equal to the first preset bare skin quality difference and less than the second preset bare skin quality difference, the second time adjustment coefficient is used to synchronously increase the dehairing time and the degreasing time of the drum;

[0019] If the bare skin quality difference is greater than or equal to a second preset bare skin quality difference, then using a third time adjustment coefficient to synchronously increase the dehairing time and the degreasing time of the drum;

[0020] The bare skin quality difference is the difference between the preset bare skin quality threshold and the bare skin quality evaluation value.

[0021] Furthermore, whether the processing of the macerated leather meets the preset standard is determined based on the penetration uniformity characteristic value, wherein:

[0022] If the penetration uniformity characteristic value is less than a first preset penetration uniformity threshold, it is determined that the processing of the macerated leather does not meet the preset standard, and the softener content in the drum is increased according to the difference between the first preset penetration uniformity threshold and the penetration uniformity characteristic value;

[0023] If the penetration uniformity characteristic value is greater than or equal to the first preset penetration uniformity threshold and less than the second preset penetration uniformity threshold, it is determined that the processing of the macerated leather does not meet the preset standard, and a second determination is made based on the softness characteristic value whether the processing of the macerated leather meets the preset standard;

[0024] If the penetration uniformity characteristic value is greater than or equal to a second preset penetration uniformity threshold, it is determined that the processing of the macerated leather meets the preset standard, and the macerated leather meeting the preset standard is placed in the oscillating softening machine;

[0025] The penetration uniformity characteristic value is determined by the hardness of each sampling point of the macerated leather.

[0026] Furthermore, a secondary determination is made based on the soft characteristic value whether the processing of the macerated leather meets the preset standard, wherein:

[0027] If the soft characteristic value is less than the preset soft characteristic value, it is determined that the processing of the macerated leather does not meet the preset standard, and the stirring speed of the drum is increased according to the difference;

[0028] If the soft characteristic value is greater than or equal to the preset soft characteristic value, it is determined that the processing of the macerated leather meets the preset standard, and the macerated leather that meets the preset standard is placed in the oscillation softening machine.

[0029] Furthermore, the process of obtaining the soft characteristic value includes:

[0030] Measuring the thickness of a plurality of sampling points, and calculating an initial thickness average value, which is recorded as a first thickness;

[0031] Using a leather thickness tester, applying a preset pressure to each sampling point and measuring the thickness of the leather when the preset pressure is applied, and calculating an average thickness under the preset pressure, which is recorded as the second thickness;

[0032] The soft characteristic value is the difference between the first thickness and the second thickness.

[0033] Furthermore, whether the leather processing meets the preset standard is determined based on the bending rebound characteristic value of the leather, wherein:

[0034] If the bending rebound characteristic value is less than a preset bending rebound threshold, it is determined that the leather processing does not meet the preset standard, and the vibration frequency of the oscillation softening machine is increased according to the difference between the preset bending rebound threshold and the bending rebound characteristic value;

[0035] If the bending rebound characteristic value is greater than or equal to the preset bending rebound threshold, it is determined that the processing of the leather meets the preset standard, and the leather that meets the preset standard is ground and dried.

[0036] Furthermore, the process of obtaining the bending springback characteristic value includes:

[0037] Use a leather bending tester to bend the leather placed horizontally to a preset angle;

[0038] After maintaining the preset angle for a preset time, record the bending recovery angle;

[0039] The ratio of the bending recovery angle to the preset bending angle is recorded as the bending rebound characteristic value.

[0040] Furthermore, the increase amplitude of the vibration frequency of the oscillation softening machine is positively correlated with the bending rebound difference, wherein the bending rebound difference is the difference between a preset bending rebound threshold and a bending rebound characteristic value.

[0041] Furthermore, under the first preset condition, there are several frequency correction methods for correcting the vibration frequency of the oscillation softening machine, wherein:

[0042] If the surface gloss difference is less than a first preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using a first correction coefficient;

[0043] If the surface gloss difference is greater than or equal to the first preset surface gloss difference and less than the second preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using the second correction coefficient;

[0044] If the surface gloss difference is greater than or equal to a second preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using a third correction coefficient;

[0045] The first preset condition is that the surface glossiness of the leather is less than a preset surface glossiness after the vibration frequency of the oscillation softening machine is increased;

[0046] The surface glossiness of the leather is obtained by glossiness values of several sampling points.

[0047] Compared with the prior art, the beneficial effects of the present invention are that the present invention verifies the dehairing and degreasing effects of bare leather through the bare leather quality evaluation value, and removes impurities and grease on the surface of the bare leather; evaluates the penetration uniformity of the softener in the macerated leather through the penetration uniformity characteristic value, ensures the uniform penetration and softening of the macerated leather by the softener during the leather processing process, and further verifies the softening processing effect of the macerated leather through the softness characteristic value; accurately monitors the softening quality of the leather through the bending rebound characteristic value and adopts corresponding adjustment strategies according to the comparison results, further improves the extensibility and softness of the leather, and also helps to flatten and shape the leather, thereby improving the leather softening processing efficiency.

[0048] Furthermore, the present invention obtains the bare skin quality evaluation value by obtaining the fur area ratio and the oil content of the bare skin, thereby providing a specific quantitative indicator for the evaluation of the bare skin quality, thereby avoiding the subjectivity in the bare skin quality evaluation method.

[0049] Furthermore, when the present invention determines through the bare skin quality evaluation value that the processing of the bare skin does not meet the preset standards, the dehairing time and the degreasing time of the drum are increased. Through the bare skin quality evaluation value, the processing quality of the bare skin during the processing process can be accurately evaluated, problems can be discovered and solved in time, and the processing quality control level is improved.

[0050] Furthermore, the present invention provides several time adjustment modes for synchronously increasing the depilation time and the degreasing time of the drum, thereby achieving precise control of the depilation time and the degreasing time of the drum and providing an intelligent level.

[0051] Furthermore, the present invention monitors the maceration process in real time by determining whether the maceration process meets preset standards based on the penetration uniformity characteristic value, thereby achieving timely adjustment of the maceration process parameters.

[0052] Furthermore, the present invention sets a softness characteristic value and determines whether the processing of the macerated leather meets the preset standards based on the softness characteristic value. The softness characteristic value is a quantitative indicator used to describe the softness of the macerated leather after processing, thereby achieving an accurate evaluation of the processing quality of the macerated leather.

[0053] Furthermore, the present invention determines whether the processing of the leather meets the preset standards based on the bending rebound characteristic value of the leather. The bending rebound characteristic value is a quantitative indicator used to describe the ability of the leather to return to its original shape after being subjected to a bending force. It reflects the flexibility and elasticity of the leather, thereby improving the efficiency of the leather softening process.

[0054] Furthermore, the present invention provides several frequency correction methods for correcting the vibration frequency of the oscillating softening machine, making the leather softening process more flexible and precise, and able to adapt to the characteristics and processing requirements of different types of leather, thereby improving the leather softening quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a step diagram of a leather softening method according to an embodiment of the present invention;

[0056] Figure 2 This is a flow chart of an embodiment of the present invention for determining whether the processing of bare leather meets preset standards;

[0057] Figure 3 This is a flow chart of an embodiment of the present invention for determining whether the processing of macerated leather meets preset standards;

[0058] Figure 4 This is a flow chart of an embodiment of the present invention for determining whether leather processing meets preset standards. DETAILED DESCRIPTION

[0059] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below with reference to embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0060] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0061] It should be pointed out that the data in this embodiment are all obtained by comprehensive analysis and evaluation of the historical test data of the present invention in the three months before this test and the corresponding historical test results. Those skilled in the art can understand that the method of determining the above-mentioned single parameter of the method of the present invention can be to select the value with the highest proportion as the preset standard parameter according to the data distribution, use weighted summation to use the obtained value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter or other selection methods, as long as the method of the present invention can clearly define the different specific situations in the single determination process through the obtained value.

[0062] See also Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4 As shown in FIG. 1 , they are respectively embodiments of the present invention.

[0063] An embodiment of the present invention provides a leather softening method, comprising:

[0064] Step S1, adding a depilatory agent into a rotary drum and placing a raw hide, starting the drum to depilate the raw hide under the action of the depilatory agent; after the drum rotates for a preset depilatory time of 3.3 hours, adding a degreasing agent into the drum, and after the drum rotates for a preset degreasing time of 6 hours, draining and washing are performed to obtain a bare hide;

[0065] Step S2, obtaining the fur area ratio and the oil content of the bare skin, obtaining a bare skin quality evaluation value, and determining whether the processing of the bare skin meets the preset standard according to the bare skin quality evaluation value;

[0066] Step S3, adding the bare leather that meets the preset standards into a drum containing a softener and stirring and rotating it, and obtaining the macerated leather after a preset softening time of 50 minutes;

[0067] Step S4, setting a plurality of sampling points on the surface of the macerated leather, obtaining the hardness of each sampling point, and calculating a penetration uniformity characteristic value. If it is determined based on the penetration uniformity characteristic value that the macerated leather processing does not meet the preset standard, the softener content in the drum is increased, or, based on the softness characteristic value, a second determination is made as to whether the macerated leather processing meets the preset standard.

[0068] Step S5, placing the macerated leather that meets the preset standards into an oscillating stretching machine for oscillation stretching to obtain leather; obtaining a bending and rebound characteristic value of the leather, and determining whether the processing of the leather meets the preset standards based on the bending and rebound characteristic value;

[0069] Step S6: buffing and drying the leather that meets the preset standards to obtain softened leather.

[0070] In this embodiment, the depilatory agent is a protease depilatory agent, the degreasing agent is a surfactant degreasing agent, and the softening agent is an enzyme preparation. There is no specific limitation, as long as the leather softening processing requirements are met.

[0071] Specifically, the process of determining whether the processing of the bare skin does not meet the preset standards based on the bare skin quality evaluation value includes:

[0072] Comparing the bare skin quality evaluation value with the preset bare skin quality threshold;

[0073] If the bare skin quality evaluation value is less than the preset bare skin quality threshold of 0.58, it is determined that the processing of the bare skin does not meet the preset standard, and the dehairing time and degreasing time of the drum are synchronously increased according to the difference between the bare skin quality evaluation value and the preset bare skin quality threshold;

[0074] The process of obtaining the bare skin quality evaluation value includes:

[0075] The image processing software processes the bare skin image, identifies the fur and leather parts in the image, calculates the fur area ratio, and multiplies it by the preset fur area ratio weight of 0.43 to obtain the first evaluation value;

[0076] The oil content in the bare skin is measured by a skin oil detector and multiplied by a preset oil content weight of 0.57 to obtain a second evaluation value;

[0077] The bare skin quality evaluation value is the sum of the first evaluation value and the second evaluation value.

[0078] Specifically, there are several time adjustment methods for the synchronous increase of the depilatory time and the degreasing time of the drum, among which,

[0079] If the bare skin quality difference is less than the first preset bare skin quality difference of 0.23, the first time adjustment coefficient of 1.04 is used to synchronously increase the dehairing time and the degreasing time of the drum;

[0080] If the bare skin quality difference is greater than or equal to the first preset bare skin quality difference and less than the second preset bare skin quality difference of 0.46, then the second time adjustment coefficient of 1.06 is used to synchronously increase the dehairing time and the degreasing time of the drum;

[0081] If the bare skin quality difference is greater than or equal to the second preset bare skin quality difference, the third time adjustment coefficient of 1.08 is used to synchronously increase the dehairing time and the degreasing time of the drum;

[0082] The bare skin quality difference is the difference between the preset bare skin quality threshold and the bare skin quality evaluation value.

[0083] Specifically, whether the processing of the macerated leather meets the preset standards is determined based on the penetration uniformity characteristic value, wherein:

[0084] If the penetration uniformity characteristic value is less than a first preset penetration uniformity threshold value of 0.45, it is determined that the processing of the macerated leather does not meet the preset standard, and the softener content in the drum is increased according to the difference between the first preset penetration uniformity threshold value and the penetration uniformity characteristic value;

[0085] If the penetration uniformity characteristic value is greater than or equal to the first preset penetration uniformity threshold and less than the second preset penetration uniformity threshold of 0.73, it is determined that the processing of the macerated leather does not meet the preset standard, and a second determination is made based on the softness characteristic value whether the processing of the macerated leather meets the preset standard;

[0086] If the penetration uniformity characteristic value is greater than or equal to the second preset penetration uniformity threshold, it is determined that the processing of the macerated leather meets the preset standard, and the macerated leather meeting the preset standard is placed in the oscillation softening machine;

[0087] The penetration uniformity characteristic value is the ratio between a preset hardness value and an average value of the sum of the hardnesses of the sampling points, and the hardness of the sampling points is obtained by a leather hardness tester.

[0088] Specifically, a secondary determination is made based on the soft characteristic value whether the processing of the macerated leather meets the preset standard, wherein:

[0089] If the soft characteristic value is less than the preset soft characteristic value of 0.23 mm, it is determined that the processing of the macerated leather does not meet the preset standard, and the stirring speed of the drum is increased according to the difference;

[0090] If the soft characteristic value is greater than or equal to the preset soft characteristic value, it is determined that the processing of the macerated leather meets the preset standard, and the macerated leather that meets the preset standard is placed in the oscillation softening machine.

[0091] Specifically, the process of obtaining the soft characteristic value includes:

[0092] Measuring the thickness of a plurality of sampling points, and calculating an initial thickness average value, which is recorded as a first thickness;

[0093] Using a leather thickness tester to apply a preset pressure to each sampling point and measure the thickness of the leather when the preset pressure of 5N is applied, and calculate the average thickness at the preset pressure, which is recorded as the second thickness;

[0094] The soft characteristic value is the difference between the first thickness and the second thickness.

[0095] Specifically, whether the leather processing meets the preset standard is determined based on the bending rebound characteristic value of the leather, wherein:

[0096] If the bending rebound characteristic value is less than a preset bending rebound threshold value of 0.87, it is determined that the leather processing does not meet the preset standard, and the vibration frequency of the oscillation softening machine is increased according to the difference between the preset bending rebound threshold value and the bending rebound characteristic value;

[0097] If the bending rebound characteristic value is greater than or equal to the preset bending rebound threshold, it is determined that the processing of the leather meets the preset standard, and the leather that meets the preset standard is ground and dried.

[0098] Specifically, the process of obtaining the bending springback characteristic value includes:

[0099] Use a leather bending tester to bend the leather placed horizontally at a preset angle of 90°;

[0100] After maintaining the preset angle for a preset time of 10 minutes, record the bending recovery angle;

[0101] The ratio of the bending recovery angle to the preset bending angle is recorded as the bending rebound characteristic value.

[0102] Specifically, the increase in the vibration frequency of the oscillation softening machine is positively correlated with the bending rebound difference, wherein the positive correlation is, for example, a linear positive correlation or a nonlinear positive correlation, and the slope of the linear positive correlation is not specifically limited. It can be understood that the greater the bending rebound difference, the greater the vibration frequency amplitude of the oscillation softening machine; the bending rebound difference is the difference between the preset bending rebound threshold and the bending rebound characteristic value.

[0103] Specifically, under the first preset condition, there are several frequency correction methods for correcting the vibration frequency of the oscillation softening machine, among which:

[0104] If the surface gloss difference is less than the first preset surface gloss difference 8GU, the vibration frequency of the oscillation stretching machine is corrected using a first correction coefficient of 0.98;

[0105] If the surface gloss difference is greater than or equal to the first preset surface gloss difference and less than the second preset surface gloss difference 16GU, the vibration frequency of the oscillation stretching machine is corrected using a second correction coefficient of 0.96;

[0106] If the surface gloss difference is greater than or equal to the second preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using a third correction coefficient of 0.94;

[0107] The first preset condition is that the surface glossiness of the leather is less than a preset surface glossiness of 60GU after the vibration frequency of the oscillation softening machine is increased;

[0108] The surface glossiness of the leather is obtained by glossiness values of several sampling points, and the glossiness of each sampling point is obtained by a gloss meter;

[0109] The surface glossiness of the leather is the ratio of the average value of the sum of the glossiness values of a plurality of sampling points to a preset glossiness.

[0110] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0111] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A leather softening method, characterized in that: include: Step S1, adding a depilatory agent into a rotary drum and placing raw hides therein, starting the rotary drum to depilate the raw hides under the action of the depilatory agent; After the drum rotates for a preset dehairing time, a degreasing agent is added to the drum, and after the drum rotates for a preset degreasing time, liquid is drained and cleaned to obtain bare skin; Step S2, obtaining the fur area ratio and the oil content of the bare skin, obtaining a bare skin quality evaluation value, and determining whether the processing of the bare skin meets the preset standard according to the bare skin quality evaluation value; Step S3, adding the bare leather that meets the preset standards into a drum containing a softener and stirring and rotating it, and obtaining the macerated leather after a preset softening time; Step S4, setting a plurality of sampling points on the surface of the macerated leather, obtaining the hardness of each sampling point, and calculating a penetration uniformity characteristic value. If it is determined based on the penetration uniformity characteristic value that the macerated leather processing does not meet the preset standard, the softener content in the drum is increased, or, based on the softness characteristic value, a second determination is made as to whether the macerated leather processing meets the preset standard. Step S5, placing the macerated leather that meets the preset standards into an oscillating stretching machine for oscillation stretching to obtain leather; obtaining a bending and rebound characteristic value of the leather, and determining whether the processing of the leather meets the preset standards based on the bending and rebound characteristic value; Step S6, grinding and drying the leather that meets the preset standards to obtain softened leather; The process of determining whether the processing of the bare skin does not meet the preset standards based on the bare skin quality evaluation value includes: Comparing the bare skin quality evaluation value with the preset bare skin quality threshold; If the bare skin quality evaluation value is less than the preset bare skin quality threshold, it is determined that the processing of the bare skin does not meet the preset standard, and the dehairing time and degreasing time of the drum are synchronously increased according to the difference between the bare skin quality evaluation value and the preset bare skin quality threshold; The bare skin quality evaluation value is determined based on the hair area ratio and the oil content of the bare skin; The uniform penetration characteristic value is used to determine whether the processing of the macerated leather meets the preset standards, where: If the penetration uniformity characteristic value is less than a first preset penetration uniformity threshold, it is determined that the processing of the macerated leather does not meet the preset standard, and the softener content in the drum is increased according to the difference between the first preset penetration uniformity threshold and the penetration uniformity characteristic value; If the penetration uniformity characteristic value is greater than or equal to the first preset penetration uniformity threshold and less than the second preset penetration uniformity threshold, it is determined that the processing of the macerated leather does not meet the preset standard, and a second determination is made based on the softness characteristic value whether the processing of the macerated leather meets the preset standard; If the penetration uniformity characteristic value is greater than or equal to a second preset penetration uniformity threshold, it is determined that the processing of the macerated leather meets the preset standard, and the macerated leather meeting the preset standard is placed in the oscillating softening machine; Wherein, the penetration uniformity characteristic value is determined by the hardness of each sampling point of the macerated leather; There are several time adjustment methods for the synchronous increase of the depilatory time and the degreasing time of the drum, among which: If the bare skin quality difference is less than a first preset bare skin quality difference, the first time adjustment coefficient is used to synchronously increase the dehairing time and the degreasing time of the drum; If the bare skin quality difference is greater than or equal to the first preset bare skin quality difference and less than the second preset bare skin quality difference, the second time adjustment coefficient is used to synchronously increase the dehairing time and the degreasing time of the drum; If the bare skin quality difference is greater than or equal to a second preset bare skin quality difference, then using a third time adjustment coefficient to synchronously increase the dehairing time and the degreasing time of the drum; The bare skin quality difference is the difference between the preset bare skin quality threshold and the bare skin quality evaluation value; The leather processing is judged to be in accordance with the bending rebound characteristic value of the leather, wherein: If the bending rebound characteristic value is less than a preset bending rebound threshold, it is determined that the leather processing does not meet the preset standard, and the vibration frequency of the oscillation softening machine is increased according to the difference between the preset bending rebound threshold and the bending rebound characteristic value; If the bending rebound characteristic value is greater than or equal to the preset bending rebound threshold, it is determined that the processing of the leather meets the preset standard, and the leather meeting the preset standard is ground and dried; The process of obtaining the soft characteristic value includes: Measuring the thickness of a plurality of sampling points, calculating an initial thickness average value, and recording it as a first thickness; Using a leather thickness tester, applying a preset pressure to each sampling point and measuring the thickness of the leather when the preset pressure is applied, and calculating an average thickness under the preset pressure, which is recorded as the second thickness; Wherein, the soft characteristic value is the difference between the first thickness and the second thickness; The process of obtaining the bending springback characteristic value includes: Use a leather bending tester to bend the leather placed horizontally to a preset angle; After maintaining the preset angle for a preset time, record the bending recovery angle; The ratio of the bending recovery angle to the preset bending angle is recorded as the bending rebound characteristic value.

2. The leather softening method according to claim 1, wherein: The soft characteristic value is used to determine whether the processing of the macerated leather meets the preset standards. If the soft characteristic value is less than the preset soft characteristic value, it is determined that the processing of the macerated leather does not meet the preset standard, and the stirring speed of the drum is increased according to the difference; If the soft characteristic value is greater than or equal to the preset soft characteristic value, it is determined that the processing of the macerated leather meets the preset standard, and the macerated leather that meets the preset standard is placed in the oscillation softening machine.

3. The leather softening method according to claim 2, wherein: The increase amplitude of the vibration frequency of the oscillating stretching machine is positively correlated with the bending rebound difference, wherein the bending rebound difference is the difference between a preset bending rebound threshold and a bending rebound characteristic value.

4. The leather softening method according to claim 3, characterized in that: Under the first preset condition, there are several frequency correction methods for correcting the vibration frequency of the oscillation softening machine, among which: If the surface gloss difference is less than a first preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using a first correction coefficient; If the surface gloss difference is greater than or equal to the first preset surface gloss difference and less than the second preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using the second correction coefficient; If the surface gloss difference is greater than or equal to a second preset surface gloss difference, the vibration frequency of the oscillation stretching machine is corrected using a third correction coefficient; The first preset condition is that the surface glossiness of the leather is less than a preset surface glossiness after the vibration frequency of the oscillation softening machine is increased; The surface glossiness of the leather is obtained by glossiness values of several sampling points.

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