KR102432799B1 - A decolorization method of hemp rind for burlap thread - Google Patents

Abstract

The present invention relates to a method for decolorizing hemp husk for hemp yarn, comprising: a step of preparing hemp husk yarn; a step of spreading the prepared hemp husk yarn; a step of preparing a synthetic resin net of a predetermined size and injecting a predetermined amount of the unfolded hemp husk yarn; a step of immersing the net into which the hemp husk yarn is injected in alkaline water for bleaching, followed by rotational stirring; a neutralization treatment step of draining the alkaline water, then adding acidic water to the immersion water and rotating to stir to neutralize the bleached hemp husk yarn; a glossing step of draining the acidic water, making soaking water with glossing water, and glossing the neutralized hemp husk yarn through rotational agitation; a water washing treatment step of draining the glossing water, and treating the glossed hemp husk yarn with cold water; and a step of draining the water and then drying the washed hemp husk yarn after dehydration to complete the bleached hemp husk yarn. The method prevents agglomeration during the bleaching process of hemp husk to ensure even discoloration.

Description

{A decolorization method of hemp rind for burlap thread}

The present invention relates to a method of decolorizing hemp skins for hemp yarn, and more particularly, hemp skins, which are raw materials, in order to realize white hemp, which is a material used for sanitary napkins or cosmetic toners, before riding the hemp yarn, which is a preferred color for aesthetics. It relates to a bleaching method of hemp husks for hemp threads for producing white hemp threads that have been bleached by bleaching them.

Until now, hemp fabric, the raw material for domestic hemp yarn, has been manufactured by importing hemp yarn (thread) from China and weaving the fabric. When the hemp thread goes through a burning process, it becomes hemp cotton, and when used as a sanitary napkin or cotton pad, it has less odor and less irritation to the skin than general cotton wool, so its use is increasing recently in related high-end products.

However, recently, instead of hemp yarn from China, which is of poor quality, hemp raw materials, that is, hemp husks, are imported directly from Eastern Europe, and the fabric is weaved to manufacture hemp yarn, and efforts are being made to produce high-quality products while maintaining price competitiveness. However, when processing the hemp husk, the raw material for hemp yarn, it must first undergo a bleaching or decolorization process in consideration of the aesthetics, but there is a difficulty in the first step.

That is, the conventional hemp hull is peeled off in the form of a thin and long yarn, compressed and then imported, unfolded, and as shown in FIGS. After accommodating as it is, the discoloration process was performed by using strong water pressure to rise from the central lower part and cause convection of alkaline water in the receiving member through the vent in the outer circumferential direction. 1 is a photograph of a decolorization apparatus used in a method for decolorizing hemp husks for hemp according to the prior art, and FIG. This is a photo of the receiving member that accommodates the shell

However, in the conventional decolorization device of hemp husks, the hemp husks are pushed in the outer diameter direction of the accommodating member by the convection action in the receiving member to become dense, and thus agglomeration occurs. There was a problem in that the color did not discolor or the yarn was cut by strong water pressure, and the quality of the finished hemp yarn was deteriorated.

US 10-2409989 B1 US 10-2017-0075297 A US 10-1840130 B1

Therefore, the technical problem to be solved by the present invention is to solve the above problems, prevent agglomeration during the discoloration process of the hemp husk, so that the discoloration is performed evenly, and the discoloration of the hemp husk is made with an appropriate strength at the time of discoloration. It is to provide a method of decolorizing hemp husks for hemp yarns that can prevent the hemp hull yarn from breaking into pieces.

The discoloration method of hemp husk for hemp yarn according to the present invention for solving the above problems is a step of preparing a hemp hull yarn, an unfolding operation step of unfolding the prepared hemp hull yarn, a synthetic resin net of a predetermined size is prepared and the unfolded hemp hull yarn Injecting a predetermined amount of, immersing the net in which the hemp husk yarn is injected into the bleaching alkaline water for discoloration and then rotatingly stirring, draining the alkaline water, and then adding acidic water to the immersion water and rotating stirring to decolorize the hemp husk yarn A neutralization treatment step of neutralizing treatment, a refining treatment step of draining the acidic water, making immersion water with refined water, and refining the neutralized hemp hull yarn through rotational stirring, draining the scoured water and then refining the refined hemp hull yarn A washing treatment step of treating cold water as washing water, and drying the washed hemp husk yarn after draining the washing water after dehydration operation to complete the bleached hemp hull yarn.

The synthetic resin mesh may be a rectangular mesh having a size of about 30 to 60 centimeters in width and length, or a circular mesh having a diameter of about 30 to 60 centimeters, respectively.

The amount of hemp bark yarn injected into the synthetic resin net is

It is preferably 0.5 to 2 kilograms per mesh.

In each step, the rotational stirring is preferably performed by vertical rotational stirring, and the number of rotations per minute is preferably 15 to 30 rpm.

Alkaline water for bleaching used as immersion water, which is a bleach, is used by diluting sodium hypochlorite (NaOCl) in water, and the dilution ratio with water is preferably 30 to 70 grams per 1 liter of water.

The alkaline water for decolorization may be subjected to rotational stirring for 1 to 3 hours after the temperature is raised to 60 to 80 degrees Celsius.

In the neutralization treatment, the alkaline water is drained, and the diluted glacial acetic acid water can be used as the immersion water as neutralized acid water.

As described above, according to the decolorization method of hemp husk for hemp according to the present invention, after injecting the hemp hull yarn into a synthetic resin mesh of an appropriate size, immersion in alkaline water for decolorization and stirring operation are performed to obtain a homogeneous whole of hemp husk. In addition to discoloration, it is primarily protected by a synthetic resin mesh, and the impact received during the discoloration process is alleviated by the appropriate rotation speed and strength of rotational stirring to prevent the hemp hull yarn from breaking into pieces, thereby producing high-quality hemp yarn. There are beneficial effects that can be

1 is a photograph of a bleaching device used in a method for bleaching hemp skins for hemp according to the prior art;
2 is a photograph of a receiving member that is inserted and accommodated in the decolorization device used in the decolorization method of hemp skins for hemp according to the prior art and accommodates hemp skins for hemp yarns therein;
3 is a photograph of a defective hemp yarn that has been subjected to a post-treatment process after bleaching using a decolorization device used in a method for decolorizing hemp skins for hemp according to the prior art;
Figure 4 is a flow chart of each process of the decolorization method of hemp husks for hemp according to the present invention;
5 is a photograph showing the process of preparing the hemp husk yarn to be decolorized through the decolorization method of hemp husk for hemp according to the present invention;
Figure 6 is a photograph showing the process of unfolding the prepared hemp husk yarn,
7 and 8 are photos showing a synthetic resin net photograph and a synthetic resin net to contain the unfolded hemp bark yarn by a predetermined size and weight, respectively, and a photograph showing the process in which the hemp bark yarn is injected;
9 is a photograph of a stirring device for stirring after immersing the net in which the hemp bark yarn is injected into immersion water such as alkaline water for decolorization;
10 and 11 are photographs showing the process in which the stirring process is performed through the rotation of the pedal in the stirring device, respectively;
12 is a photograph of the hemp yarn manufactured after the final bleaching operation is completed.

The details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

Like reference numerals refer to like elements throughout. The embodiments described herein will be described with reference to an ideal flow chart and photograph of the present invention.

Hereinafter, with reference to the accompanying drawings, a decolorization method of hemp skins for hemp according to embodiments of the present invention will be described in detail with reference to FIGS. 4 to 12 .

Figure 4 is a flow chart of each process of the decolorization method of hemp husks for hemp according to the present invention, Figure 5 is a photograph showing the process of preparing the hemp husk yarn to be decolorized through the decolorization method of hemp husks for hemp according to the present invention, Fig. 6 is a photograph showing the process of unfolding the prepared hemp hull yarn, FIGS. 7 and 8 are a synthetic resin net photograph and synthetic resin net to contain the unfolded hemp hull yarn by a predetermined size and weight, respectively. 9 is a photograph of a stirring device for stirring after immersing a net in which hemp bark yarn is injected in immersion water such as alkaline water for decolorization, FIGS. A photograph showing the process, and FIG. 12 is a photograph of the hemp yarn manufactured after the final bleaching operation is completed.

The bleaching method of hemp husks for hemp according to the present invention starts from the step (S10) of preparing the hemp husk yarns as shown in FIGS. 4 and 5 first.

That is, after peeling the hemp hull and peeling it in the form of a long and thin yarn, it is dried to prepare a hemp hull yarn compressed to a predetermined size for convenient transportation and storage. Since these hemp bark yarns usually have a bark color or brown color, bleaching to white is required for aesthetics when used as hemp yarn.

Then, as shown in Figs. 4 and 6, the unfolding operation of the hemp bark yarn in the compressed state is performed (S20).

In other words, the immersion water such as bleach, alkaline water for decolorization, etc. penetrates the compressed hemp husk yarn inside by hand, etc.

Thereafter, a synthetic resin net of a predetermined size is prepared as shown in FIG. 7 (S30), and the step of injecting a predetermined amount of stretched hemp husk yarn as shown in FIG. 8 is performed (S40).

The synthetic resin net generally uses a cloth for laundry, which is a series material such as polyester, which is commercially available, and there is no need to put any special restrictions on the size of the net. It is preferable to use a rectangular net having a size of about 30 to 60 centimeters in width and height or a circular net having a diameter of about 30 to 60 centimeters, respectively, in consideration of convenience and the input condition of the immersion water evenly in the hemp husk yarn. The synthetic resin mesh not only physically protects the injected hemp hull yarn from the bleaching process, but also plays a role in preventing excessive agglomeration.

In addition, the amount of hemp hull yarn injected into the synthetic resin net is about 0.5 to 2 kilograms per net, taking into account the convenience of transport during stirring operation, the input condition of evenly immersed water in the hemp hull yarn, and the appropriate condition of rotational agitation. It is preferable to inject, and in this example, 1 kilogram of unfolded hemp husk yarn per one net was injected.

Then, after immersing the synthetic resin net in which the hemp bark yarn is injected in alkaline water for bleaching, which is a bleach, a process of rotating and stirring is performed (S50).

Looking at this in detail, as shown in Figs. 10 to 12, a synthetic resin net in which a plurality of hemp bark yarns are injected after filling alkali water for discoloration in a stirring device capable of stirring provided with a plurality of pedals in an outer diameter direction on a vertical rotation shaft. Add the bleach to the whole hemp hull yarn while rotating and stirring so that the bleaching agent, which is immersion water, penetrates evenly to achieve uniform bleaching. It is preferable that rotational stirring is performed in a vertical direction rather than in a horizontal direction. The reason is that when vertical rotational stirring is performed, the net immersed in the lower part by the pedal rises again by buoyancy and can be returned to the original position in the horizontal direction. This is because, during rotational stirring, a phenomenon in which a plurality of meshes are clustered in the outer diameter direction is prevented, thereby preventing the load of the stirring device and uniform stirring can be achieved.

At this time, the number of revolutions per minute of the stirring device is about 15 to 30 rpm. If it is too fast, even if it is injected into the net, it may give an excessive impact to the hemp hull yarn and cause the hemp hull yarn to break into pieces. In addition, this is because there may be a problem that the alkaline water for discoloration, which is the immersion water, penetrates evenly throughout the hemp hull yarn.

On the other hand, for bleaching alkaline water used as immersion water, sodium hypochlorite (NaOCl) is diluted in water, and the dilution ratio with water is 30 to 70 grams per 1 liter of water.

Sodium hypochlorite was used for CAS.NO: 7681-52-9, which was distributed in the market at a weight of 12 wt% or more, pH 11 or more, and Cl (%) 11.43 or more.

In addition, rotational stirring is performed after raising the temperature of the immersion water, which is a bleaching agent in the stirring device, to 60 to 80 degrees Celsius, and then rotational stirring for about 1 to 3 hours.

In this example, 100 kg of sodium hypochlorite was diluted in 2 tons of water, and rotational stirring was performed at a temperature of 70 degrees Celsius for 2 hours.

After draining the alkaline water, acid water is added to the immersion water, and the neutralization treatment of the bleached hemp husk yarn is performed by rotating and stirring (S60).

In order to neutralize the alkaline hemp husk yarn after decolorization, the value may vary, but in this embodiment, 1 kg of glacial acetic acid is diluted in 2 tons of water and immersed in acidic water, which is neutralized water. was made, and the temperature was raised to about 50 degrees and rotational stirring was performed for about 20 minutes so that the alkaline hemp husk yarn had a PH of 7. Of course, the values of neutralized water, elevated temperature, rotational stirring time, etc. can be changed so that the PH becomes 7 through real-time check.

Then, after draining the neutralized acid water, immersion water is made with refined water, and the neutralized hemp hull yarn is refined through rotational stirring (S70).

The value of refined water may vary in consideration of the drainage state of neutralized water, but in this embodiment, 1 kg of soap, which is a refining agent, is diluted in 2 tons of water to make immersion water, which is refined water, and the temperature is raised to approximately 50 degrees for approximately 20 minutes. The primary impurities of the neutralized hemp hull yarn are removed by rotating agitation. Of course, the numerical values of the refined water, elevated temperature, and rotational stirring time can be changed in consideration of the degree of refining through real-time checking.

Then, after draining the refined water, a process of washing the refined hemp husk yarn with cold water as washing water is performed (S80).

That is, cold water that is not heated at room temperature is washed again with water to make immersion water, and the refined hemp hull yarn is washed with water through rotational stirring to additionally remove impurities. Usually, the cold water at room temperature may be 20 to 25 degrees, but it goes without saying that the upper and lower limits may vary depending on the season. In this example, water washing was performed twice to sufficiently remove foreign substances.

Then, after draining the washing water, the washed hemp hull yarn is dehydrated using a dehydrator, etc. (S90). S100), it is possible to obtain a high-quality hemp yarn that is uniformly bleached in white as shown in FIG. 12 and does not break into pieces.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improved processes of those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. It belongs to the scope of the invention.

Claims (7)

steps to prepare hemp hull yarn,
The unfolding operation step of unfolding the prepared hemp hull yarn,
Preparing a synthetic resin net of a predetermined size and injecting a predetermined amount of the unfolded hemp bark yarn;
A step of rotating and stirring after immersing the net in which the hemp bark yarn is injected in alkaline water for bleaching, which is a bleaching agent,
A neutralization treatment step of neutralizing the bleached hemp husk yarn by adding acidic water to the immersion water after draining the alkaline water and rotating agitation;
A refining treatment step of draining the acidic water, making immersion water with refining water, and refining the neutralized hemp hull yarn through rotational stirring;
A washing treatment step of treating the refined hemp husk yarn with cold water as washing water after draining the purified water, and,
After draining the washing water, the washed hemp hull yarn is dehydrated and dried to complete the bleached hemp hull yarn
containing
A method of decolorizing hemp husks for hemp yarn. In claim 1,
The synthetic resin mesh is
A square mesh with a size of 30 to 60 centimeters in width and length, or a circular mesh with a diameter of 30 to 60 centimeters,
A method of decolorizing hemp husks for hemp yarn. In claim 1,
The amount of hemp bark yarn injected into the synthetic resin net is
0.5 to 2 kilograms per mesh
A method of decolorizing hemp husks for hemp yarn. In claim 1,
In each step, the rotational stirring is
performing vertical rotational agitation,
The number of revolutions per minute is 15 to 30 rpm.
A method of decolorizing hemp husks for hemp yarn. In claim 1,
Alkaline water for bleaching is used as an immersion water, which is a bleaching agent.
Sodium hypochlorite (NaOCl) is diluted in water and used.
The dilution ratio with water is 30 to 70 grams per liter of water.
A method of decolorizing hemp husks for hemp yarn. In claim 5,
The alkaline water for bleaching
After raising the temperature to 60 to 80 degrees Celsius, rotating stirring is performed for about 1 to 3 hours.
A method of decolorizing hemp husks for hemp yarn. In claim 1,
The neutralization treatment
After draining the alkaline water, diluted glacial acetic acid water is used as immersion water as neutralized acid water.
A method of decolorizing hemp husks for hemp yarn.

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