Green water-saving flax degumming method

Abstract

The invention provides a green and water-saving flax degumming method which comprises the following steps: A) taking part of flax original stems from flax original stems to be degummed, pre-soaking, sealing, placing, washing with water, and recovering eluent; b) wetting the rest of the flax original stems to obtain wetted flax original stems; and C) spraying the eluent onto the wetted flax stems, and sealing and degumming to obtain degummed flax. According to the method provided by the invention, the water consumption is greatly reduced, and a large amount of water sources are not needed; hot water can be provided without heating and consuming energy; a large amount of waste water and waste gas are not generated, so that water-saving and green degumming is realized; the degumming time is within the industrial acceptable range, and the degumming can be accelerated by adjusting the temperature. Compared with rain and dew degumming, the method also does not cause environmental pollution. But the degumming efficiency is greatly improved, so that the degumming time is controllable and is not obviously influenced by weather, the occupied land area is greatly reduced, and the production efficiency and the product quality are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of flax degumming, in particular to a green water-saving degumming method for flax. Background Art

[0002] At present, the rain and dew degumming of flax in arid areas is greatly affected by the weather. There is a problem that insufficient rain leads to long degumming time, which seriously affects production. Occasionally, sudden concentrated rainfall leads to excessive degumming. Either way, it will affect the yield and quality of the fiber, and thus lead to industrial losses. Warm water retting produces a large amount of wastewater and waste gas, which pollutes the environment and wastes water resources. It has seriously affected the development of the flax industry in arid areas such as Xinjiang and Gansu.

[0003] Therefore, in view of the above situation, it is very important for the development of flax industry to develop a green and water-saving degumming technology suitable for arid climate. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a green and water-saving degumming method for flax. The degumming method provided by the present invention has short degumming time, high efficiency, less water consumption and less pollution.

[0005] The present invention provides a green water-saving degumming method for flax, comprising:

[0006] A) taking part of the flax stems to be degummed, pre-soaking them, sealing them and placing them, then washing them with water, and recovering the eluent;

[0007] B) wetting the remaining part of the flax stems to obtain wetted flax stems;

[0008] C) spraying the washing liquid onto the moistened flax stems to seal and degumming, thereby obtaining degummed flax.

[0009] In some embodiments, the proportion of the part of the flax stems in step A) to the flax stems to be degummed is greater than 1 wt %;

[0010] The flax stems are obtained by drying and threshing flax plants;

[0011] The pre-soaking time is 2 to 4 hours; the sealed placement time is 3 to 4 days.

[0012] In some embodiments, the wetting method in step A) is soaking or spraying with water that has been exposed to the sun; wetting until the weight gain is 20% to 40%.

[0013] In some embodiments, the mass ratio of the flax stems to the flushing water in step A) is 1:(9-11).

[0014] In some embodiments, the step B) further comprises flattening the moistened flax stems.

[0015] In some embodiments, the mass percentage of the eluent sprayed onto the moistened flax stems in step C) is 10%.

[0016] In some embodiments, the volume of the sealed space in step C) is less than twice the volume of the original flax stem; the sealed space is selected from a closed house, a plastic film or a plastic shed.

[0017] In some embodiments, the degumming in step C) is room temperature degumming; and the degumming time is 12 days.

[0018] In some embodiments, after step A), the method further comprises repeating step B) with the washed straw and continuing to provide the eluent.

[0019] The invention provides degummed flax, which is prepared by adopting any one of the methods in the above technical solutions.

[0020] Compared with the prior art, the present invention provides a method for green water-saving degumming of flax, comprising: A) taking part of the flax stems to be degummed, pre-soaking them, sealing and placing them, and then washing them with water to recover the eluent; B) wetting the remaining part of the flax stems to obtain the wetted flax stems; C) spraying the eluent on the wetted flax stems, sealing and degumming, and obtaining the degummed flax. The method provided by the present invention greatly reduces the water consumption, does not require a large amount of water source; does not require heating and consuming energy to provide hot water; does not generate a large amount of waste water and waste gas, thereby achieving water-saving and green degumming; the degumming time is within the acceptable range of the industry, and the degumming can be accelerated by adjusting the temperature. Compared with rain and dew degumming, the present invention: this method also does not cause environmental pollution. However, it greatly improves the degumming efficiency, makes the degumming time controllable, is no longer significantly affected by the weather, and greatly reduces the occupied land area, ensuring production efficiency and product quality. DETAILED DESCRIPTION

[0021] The present invention provides a green water-saving degumming method for flax. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It should be particularly pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they all belong to the scope of protection of the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application of this article without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0022] It should be understood that the expression "one or more of..." includes each of the items recited after the expression individually and in various different combinations of two or more of the recited items, unless otherwise understood from the context and usage. The expression "and / or" in combination with three or more recited items should be understood to have the same meaning, unless otherwise understood from the context.

[0023] The use of the terms "comprising", "having" or "containing", including their grammatical synonyms, should generally be understood as open and non-restrictive, for example not excluding other unrecited elements or steps, unless otherwise specifically stated or otherwise understood from the context.

[0024] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0025] This patent is an important method for green water-saving degumming of flax in arid areas. In response to problems such as insufficient precipitation and lack of water resources, a green degumming method that uses less water and is almost unaffected by the weather has been developed through a water-saving degumming experiment with human intervention.

[0026] The present invention provides a green water-saving degumming method for flax, comprising:

[0027] A) taking part of the flax stems to be degummed, pre-soaking them, sealing them and placing them, then washing them with water, and recovering the eluent;

[0028] B) wetting the remaining part of the flax stems to obtain wetted flax stems;

[0029] C) spraying the washing liquid onto the moistened flax stems to seal and degumming, thereby obtaining degummed flax.

[0030] The green water-saving degumming method for flax provided by the invention firstly dries and threshes flax plants to obtain flax original stems.

[0031] The present invention does not limit the flax raw material, which is well known to those skilled in the art, and can be flax raw stems of different varieties from different origins.

[0032] When the flax is ripe, it is harvested and threshed and the stalks are dried.

[0033] Then, the natural strains are propagated: some flax stems are taken from the flax stems to be degummed, pre-soaked, sealed and placed, and then rinsed with water to recover the eluent. The pre-soaking time is 2 to 4 hours; specifically, it can be 2 hours, 3 hours or 4 hours; or a range between any two of the above.

[0034] The proportion of the part of the flax stems to be degummed is more than 1wt%; specifically, it can be 1%, 5%, 10%, 15%; or a higher range.

[0035] Then the pre-soaked straw is placed in a sealed container for 3-4 days. The volume of the sealed container is preferably less than 2 times the volume of the original flax stem; the sealed space includes but is not limited to a closed house, a plastic film or a plastic shed.

[0036] The pre-soaked straw is then crushed and washed in water of about 9 to 11 times its wet weight, and the eluent is recovered.

[0037] That is, the mass ratio of the flax stems to the flushing water is 1:(9-11); preferably 1:10.

[0038] The washed straw is put back into the sealed container and step B is circulated to continuously provide eluent for subsequent operations.

[0039] The flax stems are moistened to obtain moistened flax stems.

[0040] In some embodiments, the wetting method is soaking or spraying with exposed water; wetting to a weight gain of 20% to 40%; specifically, it can be 20%, 25%, 30%, 35% or 40%; or a range between any two of the above.

[0041] The baled flax stems are soaked in natural water such as tap water, well water or river water for a period of time to dehydrate until the weight increases by 20%-40%; or 20%-40% of the weight of the flax stems are sprayed on the flax stems by a spraying device and left for a period of time to obtain uniformly moist flax stems.

[0042] The last step is to flatten the moistened flax stems. The moistened flax stems are flattened by a machine, and the pressure is controlled to reduce damage to the stems.

[0043] The washing liquid is sprayed onto the moistened flax stems, and the flax stems are sealed and degummed to obtain the product.

[0044] In some embodiments, the eluent is sprayed onto the moistened flax stems at a spraying mass percentage of 10%.

[0045] The present invention does not limit the above-mentioned specific spraying method, which is well known to those skilled in the art.

[0046] Place the dehydrated or sprayed flax stems in a sealed space.

[0047] In some embodiments, the volume of the sealed space is less than 2 times the volume of the original flax stem; the sealed space is selected from a closed house, a plastic film or a plastic shed.

[0048] The spatial volume is less than 2 times the volume of the original flax stem, which can reduce the volatilization and waste of water;

[0049] In some embodiments, the degumming is room temperature degumming; the degumming time is 9 to 14 days; specifically, it can be 9, 10, 11 or 12.

[0050] After degumming at room temperature for about 12 days, the sample can be taken out and tested for degumming effect after drying to determine whether degumming is completed; the degummed flax stems are rinsed and dried, and the eluent is recovered for the above steps; the degumming time can generally be completed in 9-14 days. The dried flax stems can be peeled manually or mechanically.

[0051] The invention provides degummed flax, which is prepared by adopting any one of the methods in the above technical solutions.

[0052] The present invention provides a method for green water-saving degumming of flax, comprising: A) taking part of the flax stems to be degummed, pre-soaking them, sealing and placing them, and then washing them with water to recover the eluent; B) wetting the remaining part of the flax stems to obtain the wetted flax stems; C) spraying the eluent on the wetted flax stems, sealing and degumming, and obtaining the degummed flax. The method provided by the present invention greatly reduces the water consumption, does not require a large amount of water source; does not require heating and consuming energy to provide hot water; does not generate a large amount of waste water and waste gas, thereby achieving water-saving and green degumming; the degumming time is within the acceptable range of the industry, and the degumming can be accelerated by adjusting the temperature. Compared with rain and dew degumming, the present invention also does not cause environmental pollution. However, the degumming efficiency is greatly improved, so that the degumming time is controllable, no longer significantly affected by the weather, and the occupied land area is greatly reduced, ensuring the production efficiency and product quality. Compared with degumming without using natural flora, the degumming time can be saved by about 40%. The test uses flax produced at a low density in arid areas as raw material, and the conventional detection rate of hemp is 21-22%.

[0053] It should be understood that the order of steps or the order in which certain actions are performed is not important as long as the present invention remains operable. In addition, two or more steps or actions may be performed simultaneously.

[0054] The use of any and all examples or exemplary language, such as "for example" or "including", herein is intended only to better illustrate the invention and does not limit the scope of the invention unless otherwise claimed. No language in this specification should be construed as indicating that any non-claimed element is essential to the practice of the invention.

[0055] In addition, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as accurately as possible. However, any numerical value inherently inevitably contains standard deviations due to individual test methods. Therefore, unless otherwise expressly stated, it should be understood that all ranges, quantities, values ​​and percentages used in this disclosure are modified by "about". Here, "about" generally means that the actual value is within plus or minus 10%, 5%, 1% or 0.5% of a specific value or range.

[0056] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0057] Some cases are recorded in the embodiments and comparative examples of the present invention, wherein the embodiments show certain implementation modes of the present invention. However, this does not mean that the effects of the present invention can only be achieved in these cases.

[0058] In order to further illustrate the present invention, a green water-saving degumming method for flax provided by the present invention is described in detail below in conjunction with embodiments.

[0059] Embodiment 1:

[0060] (1) pre-soak 50 g of flax stems for 2 hours, then place them in a sealed plastic film, and after 3 days, crush and rinse the pre-soaked stems in 500 g of water, and recover the eluate;

[0061] (2) Put the straw back into the sealed plastic bag and continue degumming;

[0062] (3) Take 500g of flax stems, expose them to the sun and evenly spray 100g of tap water;

[0063] (4) Use a machine to gently flatten the moistened flax stems;

[0064] (5) spraying 50 g of the eluate obtained in (1) evenly onto the wet flax stems;

[0065] (6) wrapping the flax stems obtained in (5) with a plastic film, wherein the flax stems occupy about two-thirds of the space formed by the plastic film;

[0066] (7) Remove the sample after degumming at room temperature for 12 days

[0067] (8) washing the degummed flax stems and drying them, and recovering the eluent;

[0068] (9) After the stems are dried, they are weighed to calculate the dry stem yield;

[0069] (10) After threshing, the stems are stripped of hemp and weighed to calculate the hemp yield.

[0070] Comparative Example 1CK0

[0071] Simulated rain and dew retting (CK0): water consumption is 50ml m per day -2 Rainfall design. When setting up the experiment, weigh 500g of flax stems and spread them on the ground at a depth of about 0.5m. 2 Then use a spray pot to spray the calculated amount of water (calculated according to the area of ​​the spread flax) onto the surface of the original stems. Do this on time at 4 pm every day. Stop spraying after 30 days and check the degumming effect every 7 days.

[0072] Comparative Example 2CK1:

[0073] The difference between comparative example CK1 and example 1 is that the step of using the natural strain eluent in the degumming step is removed and replaced with an equal weight of exposed tap water, and the degumming is not completed at 12 days, but is extended to about 20 days before completion, and the other steps are the same;

[0074] Embodiment 2:

[0075] (1) pre-soak 50 g of flax stems for 4 hours, then place them in a sealed plastic film, and after 4 days, roll and rinse the pre-soaked stems in 500 g of water;

[0076] (2) Put the straw back into the sealed plastic bag and continue degumming;

[0077] (3) taking 500 g of flax stems, soaking them in tap water exposed to the sun for 30 minutes and then dehydrating them until the weight increases by about 40% (obtaining 700 g of wet stems);

[0078] (4) Use a machine to gently flatten the moistened flax stems;

[0079] (5) spraying 50 g of the eluate obtained in (1) evenly onto the wet flax stems;

[0080] (6) wrapping the flax stems obtained in (5) with a plastic film, wherein the flax stems occupy about two-thirds of the space formed by the plastic film;

[0081] (7) Remove the sample after degumming at room temperature for 12 days

[0082] (8) After the degummed flax stems are rinsed and dried, the eluent is recovered

[0083] (9) After the stems are dried, they are weighed to calculate the dry stem yield;

[0084] (10) After threshing, the stems are stripped of hemp and weighed to calculate the hemp yield.

[0085] Comparative Example 3CK2:

[0086] The difference between comparative example CK2 and example 2 is that the step of using the natural strain eluent in the degumming step is removed and replaced with an equal weight of exposed tap water. The degumming is not completed at 12 o'clock, and it is extended to about 20 days before completion. The other steps are the same;

[0087] Comparative Example 4CK3:

[0088] The 100 g of water in Example 1 was replaced with 37.5 g, that is, only 7.5% of water was added, and the other contents remained unchanged.

[0089] Comparative Example 5CK4:

[0090] The 100 g of water in Example 1 was replaced with 75 g, that is, only 15% of water was added, and the other contents remained unchanged.

[0091] The test results are shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] It can be seen from Table 1 that the degumming method of the present invention is shorter in time, more efficient, and more stable and controllable than rain and dew degumming (rain and dew degumming depends entirely on natural precipitation and natural bacteria); and is pollution-free and saves a lot of water compared to warm water retting.

[0096] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A green water-saving degumming method for flax, characterized in that: include: A) taking part of the flax stems to be degummed, pre-soaking them, sealing them and placing them, then washing them with water, and recovering the eluent; B) wetting the remaining part of the flax stems to obtain wetted flax stems; C) spraying the washing liquid onto the moistened flax stems to seal and degumming, thereby obtaining degummed flax.

2. The method according to claim 1, characterized in that Step A) the proportion of the part of the flax stems to be degummed is more than 1 wt%; The flax stems are obtained by drying and threshing flax plants; The pre-soaking time is 2 to 4 hours; the sealed placement time is 3 to 4 days.

3. The method according to claim 1, characterized in that The wetting method of step A) is to soak or spray with water that has been exposed to the sun; the wetting is carried out until the weight gain is 20% to 40%.

4. The method according to claim 1, characterized in that: In step A), the mass ratio of the flax stems to the flushing water is 1:(9-11).

5. The method according to claim 1, characterized in that The step B) further comprises flattening the moistened flax stems.

6. The method according to claim 1, characterized in that Step C) The mass percentage of the eluent sprayed onto the moistened flax stems is 10%.

7. The method according to claim 1, characterized in that Step C) The volume of the sealed space is less than 2 times the volume of the original flax stems; the sealed space is selected from a closed house, a plastic film or a plastic shed.

8. The method according to claim 1, characterized in that Step C) The degumming is performed at room temperature; the degumming time is 9 to 14 days.

9. The method according to claim 1, characterized in that: After step A), the method further comprises repeating step A) with the washed straw and continuing to provide the eluent.

10. A degummed flax, characterized in that: The method is prepared by any one of claims 1 to 9.

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