JP2021167366A - Method of manufacturing glue - Google Patents

Abstract

To provide a method of manufacturing glue which is light-colored glue of high purity more stably with a smaller workload although the method is based upon classic glue before recent times which uses no agent.SOLUTION: There is provided a method of manufacturing glue from rawhide which consists of subcutaneous tissue, a cutis layer and an epidermal layer, and has many hairs grown from the epidermal layer, and the method has the processes of: fleshing the reverse surface of the rawhide to remove the subcutaneous tissue; shaving the hairs grown on the top surface of the rawhide; performing a heat treatment to apply hot water or steam to the top surface of the shaved hide to harden and make brittle the epidermal layer; removing the epidermal layer and hairs from the top surface of the shaved hide after the heat treatment; and extracting glue from the obtained processed hide consisting of the cutis layer with hot water.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing glue.

Glue is a traditional material made from animal skins, bones, and horns, and has been widely used in the production and restoration of ancient calligraphy and crafts. The main component is a protein called gelatin, which also contains a small amount of impurities such as fats and oils and ash derived from raw materials and extraction solvents.

Glue is basically dissolved by adding water and used in a liquid state (sol state). In the production of traditional oriental paintings and Japanese paintings, glue first acts as a dispersant (surfactant) when the pigment is dissolved in water. Then, as drying and lowering the temperature progress, the bonds between the molecules proceed and solidify (gel) into a jelly, which acts as a temporary fixing agent for holding the pigment on a base material such as paper or cloth. Then, in the final dried paint layer, it acts as an adhesive for fixing the pigment to the base material.

An example of rawhide (cow rawhide with hair) is shown in FIG. The raw skin shown in FIG. 1 is composed of a subcutaneous tissue, a dermis layer, and an epidermis layer, and a large number of hairs grow from the epidermis layer, and the hair roots of these hairs reach the middle part of the dermis layer. The dermis layer is dominated by a fibrous protein called "collagen," which is broken down by heating to produce glue, mainly composed of gelatin. The epidermis layer and hair are mainly composed of a fibrous protein called "keratin", and the conditions under which they are decomposed are different from those of collagen. Dark-colored dirt and mud are often attached to the epidermis layer and hair, and it is difficult and requires a large amount of work to sufficiently remove them only by washing with water. In addition, the hair and epidermis layer are often dark in themselves. Therefore, when the components derived from these are mixed, the glue is darkened. Therefore, in order to obtain bright glue stably and efficiently, it is effective to remove all the subcutaneous tissue, the epidermis layer and the hair, leaving only the dermis layer.

Glue is roughly divided into Western glue, Japanese glue, and classical glue. In general, samak is mainly made from chrome tanned leather scraps, dechromized by lime immersion, sulfuric acid immersion, and further lime addition, and then extracted in hot water. After intense filtration and vacuum concentration, coagulation and drying are performed. It is made through such things. On the other hand, Japanese glue is generally made from untanned skin that has been depilated by lime treatment, and is different from Western glue in that it is lightly filtered after extraction. in use. However, the hair removal and pre-extraction treatment of the raw hide is mainly based on modern Western-derived methods using lime and sulfide compounds, and defoamers, preservatives, bleaching agents, etc. are added as appropriate after extraction. , The raw materials and manufacturing method have changed significantly from the pre-modern glue.

Classical glue is a material that relies on pre-modern methods, and after freshening the underside of the raw skin (removal of the subcutaneous tissue, etc.), the hair was removed by river bleaching (river pickling). The skin, physically shaved (hair-cut) shaved fur, deer horns, fish scales, etc. are used as raw materials, washed with water, etc., and then extracted in hot water. That is, unlike the manufacturing method after modern times, lime, acid and other chemicals are not used in each process before and after pretreatment such as hair removal of raw materials and extraction. Therefore, the substitution of side chains in the amino acid residues asparagine and glutamine in gelatin is relatively mild, and many of them exhibit isoionic points in the neutral to weakly acidic range. Of these, it is possible to obtain a classic glue that becomes light-colored and matte in the dry state, especially from the rawhide rawhide for cow shaving. In addition, classical glue with such characteristics is also effective in ensuring the color development of pigments when used for calligraphic works and restoration.

However, with traditional classical glue, which is made from raw materials only by freshening and shaving, the glue occasionally accidentally mixes dark components such as dirt and fine tissue debris from the hair and epidermal layers into the glue. There was a problem that darkening occurred. Conventional shaving and washing with water alone require a large amount of work to process the raw materials, and it is extremely difficult to sufficiently remove the hair and epidermis layer, which are the causative sites that occasionally cause the glue to darken accidentally. rice field.

Therefore, an object of the present invention is to provide a method for producing a light-colored glue having a higher purity and with a smaller amount of work, while being based on a pre-modern classical glue manufacturing method that does not use a drug. ..

As a result of diligent research in view of the above problems, the present inventors shave the hair growing on the surface of the raw skin, and then perform a heat treatment of applying hot water to the surface to harden and weaken the epidermis layer, and heat-treat the hair. By removing the epidermis layer and hair from the surface, it was discovered that a light-colored glue can be stably produced with a small amount of work, and the present invention was conceived.

The method for producing glue of the present invention is a method for producing glue from a raw skin which is composed of a subcutaneous tissue, a dermis layer, and an epidermis layer and has many hairs growing from the epidermis layer, and freshens the back surface of the raw skin. The process of removing the subcutaneous tissue, the process of shaving the hair growing on the surface of the dermis, and the heat treatment of applying hot water to the surface of the obtained dermis are performed to harden and weaken the epidermis layer, and the heat treatment is performed. It is characterized by having a step of removing the epidermis layer and hair from the surface of the shaved fur, and a step of extracting glue from the processed dermis composed of the obtained dermis layer with hot water.

In the heat treatment step, it is preferable to supply water to the surface of the shaved fur and then apply a hot trowel on the water to heat the water.

The temperature of hot water in the heat treatment step is preferably 50 to 150 ° C.

In the shaving step, it is preferable to shave so that shortly cut hair remains on the surface of the raw skin.

It is preferable that the removal step is performed by high-pressure water washing.

It is preferable to further have a step of freshening both the front and back surfaces of the obtained processed leather.

It is preferable to carry out the extraction step after washing the obtained processed skin.

According to the present invention, it is possible to stably produce bright-colored glue with a small amount of work, based on the pre-modern classical glue manufacturing method that does not use chemicals.

It is the schematic which shows an example of the raw skin. It is the schematic which shows the raw skin which removed the subcutaneous tissue. It is the schematic which shows the shaved raw skin. It is the schematic which shows an example of the heat treatment of a shaved fur. It is the schematic which shows the shaved fur after heat treatment. It is the schematic which shows the processed skin after washing with high pressure water. It is a photograph which shows the glue produced in Example 2.

In the production method according to one embodiment of the present invention, (1) raw cowhide with hair is used as the raw hide, (2) the raw hide is washed, (3) the outer edge and the terminal portion of the raw hide are excised, and (4) the raw hide. The back side of the fur is freshened, (5) the surface of the raw skin is shaved, (6) the shaved raw skin is washed, (7) the surface of the obtained shaved fur is heat-treated, and (8) the heat-treated shaved fur is treated. The surface of the skin was washed with high-pressure water to remove the epidermis layer and hair roots. ) It has a process of extracting glue from processed skin with hot water. Each step will be described in detail below with reference to the raw hide shown in FIG.

(1) Rawhide As the rawhide, there is a large amount of dermis layer, which is a raw material for glue, and a rawhide of cattle, which has a large amount of distribution and is easily available, is preferable. However, the raw skin used in the production method of the present invention is not limited to this, and skins of other animal species used as raw materials for glue, such as wild boar, deer, and rabbit, may be used.

(2) Washing The raw skin may be washed. Examples of the method for cleaning the raw leather include putting the raw leather and water in a leather drum (rotary stirrer) and stirring the raw leather for cleaning. Dirt and dirt may adhere to the front and back surfaces of the cow hide and between the hairs, and it is desirable to remove it by washing.

(3) Excision If the raw skin has a tail, legs and abdomen, the tail, legs and abdomen may be excised. The dermis layer, which is the raw material of glue, has the thickest back part of the dermis, and it is desirable to excise the part other than the back part of the dermis in order to obtain a stable and efficient bright-colored glue.

(4) Freshing Fresh the back side of the raw leather. “Freshing” is to remove subcutaneous connective tissue, fat, meat, etc. (corresponding to the subcutaneous tissue in FIG. 1) remaining on the flesh surface of the skin at the time of peeling. As a result, as shown in FIG. 2, the subcutaneous tissue is removed from the front surface of the back surface. The freshing can be performed by a commonly used method, and a freshing machine (a machine generally used in leather processing for scraping the subcutaneous tissue or the like from the flesh surface of the skin) or a knife can be used.

(5) Shaving A large number of hairs growing from the surface of the raw skin (the surface of the epidermis layer) are shaved. The method of shaving is not particularly limited, but it is preferable to use a freshening machine, a knife, or a hair clipper or the like. As shown in FIG. 3, it is desirable to shave the hair so that it remains very short (for example, about 0.5 to 10 mm) from the surface of the epidermal layer. As a result, the heat treatment described later can be effectively and stably performed.

(6) Washing The shaved raw skin (shaved fur) may be washed again in order to remove the shaved hair and the like. Examples of the washing method include a method of washing the skin with running water.

(7) Heat treatment Heat treatment is performed by applying hot water to the surface of the shaved fur. When hot water is applied to the surface of the shaved fur, proteins such as keratin in the epidermis layer are denatured by heat to coagulate and weaken. By applying hot water only to the surface of the shaved fur, the epidermal layer of the shaved fur can be selectively heat-denatured. That is, while the epidermis layer is hardened and weakened by heat denaturation, the dermis layer below the epidermis layer remains raw and soft. Therefore, the hardened / fragile epidermis layer can be easily destroyed / removed by high-pressure water washing described later, but the dermis layer below the epidermis layer remains difficult to crush. As a result, it is possible to destroy / remove only the epidermis layer that has been hardened / fragile by high-pressure water washing.

As shown in FIG. 1, it has hair root tissue in the portion of the dermis layer on the epidermis layer side, hair grows from those hair roots, and hair grows on the skin surface through the epidermis layer. By destroying and removing the epidermis layer, the exposed portion of the entire hair including the hair root tissue increases, so that it becomes easy to remove the hair on the surface of the shaved fur including the hair root tissue by high-pressure water washing. Therefore, by hardening and weakening the epidermis layer by heat treatment, it is possible to remove the hair including the epidermis layer and the hair root tissue while leaving the dermis layer.

The depth of hardening and fragility from the skin surface due to heat treatment can be appropriately adjusted by the temperature of the hot water applied to the skin surface and the time of application of the hot water. That is, if the heat treatment is insufficient, the epidermis layer is not sufficiently hardened and weakened, so that the epidermis layer and hair cannot be completely removed by high-pressure water washing and remain. Further, if the heat treatment is excessive, the dermis layer below the epidermis layer is hardened and weakened, so that the portion of the dermis layer close to the epidermis layer is scraped by high-pressure water washing. Even if a part of the dermis layer is removed by high-pressure water washing, it is preferable that the epidermis layer and hair remain, and the heat treatment may be performed until the portion of the dermis layer near the epidermis layer is hardened and weakened. ..

The temperature of hot water is preferably about 50 to 150 ° C. When the temperature of the hot water is within this range, the epidermis layer on the surface of the shaved fur can be heat-denatured without the heat denaturation proceeding to the inside of the dermis layer by performing the heat treatment for an appropriate time. The temperature of hot water is more preferably about 80 to 120 ° C.

The heat treatment time is appropriately set according to the temperature of hot water, the type of raw skin, and the water temperature of high-pressure water washing. When the temperature of hot water is about 100 ° C, the heat treatment time is preferably 40 to 150 seconds when the water temperature of high-pressure water washing is about 20 ° C, and the heat treatment time when the water temperature of high-pressure water washing is about 10 ° C. Is preferably 50 to 180 seconds. If the heat treatment time is within this range, only the epidermal layer on the surface of the shaved fur can be appropriately heat-denatured.

As a method of applying hot water, hot water may be applied directly to the surface of the shaved fur, but after supplying water to the surface of the shaved fur, the water may be heated to make hot water. At that time, the heated water may be partially turned into steam. As a heating method, as shown in FIG. 4, a method of applying a hot trowel to the supplied water to heat it can be mentioned. A proper amount of water is contained between a large number of hairs left unshaved, and then a hot trowel is applied to heat the water contained in the hairs, and a part of the hairs is vaporized.

(8) High-pressure water washing The surface of the heat-treated shaved fur is washed with high-pressure water to remove the epidermis layer and hair roots. "High-pressure water cleaning" means that by spraying high-pressure water using a high-pressure water washer, the deposits on the surface are crushed and peeled off by the impact force. As shown in FIG. 5, the skin layer of the heat-treated shaved fur is hardened and weakened. Therefore, as shown in FIG. 6, the epidermis layer including the hair root tissue can be destroyed and removed by high-pressure water washing.

The water temperature for high-pressure water washing is not particularly limited, and normal temperature water can be used. Considering the suppression of deterioration such as putrefaction of the skin, it is desirable that the temperature is low, and the temperature is preferably about 1 to 10 ° C. Further, the heat treatment time and the like can be appropriately adjusted according to the environmental temperature and the like.

As described above, in the present invention, since the surface of the shaved fur is heat-treated by applying hot water, the surface of the shaved fur is washed with high-pressure water to remove the epidermis layer including the hair root tissue, which is epoch-making. A technical effect can be obtained. In the conventional classical glue manufacturing method, a large amount of work is required for the washing process after hair removal, but in the method of the present invention, even the hair root tissue can be removed by high-pressure water washing, so that the working time is greatly reduced. In addition, product pollution factors can be significantly reduced.

In the present embodiment, high-pressure water washing is mentioned as a method for removing the epidermis layer and hair roots from the surface of the heat-treated shaved fur, but the present invention is not limited to this, and the epidermis layer hardened and weakened by the heat treatment is removed. Any method that can be used can be selected as appropriate. For example, the hardened / weakened epidermis layer may be scraped off with a knife or a leather machine.

(9) Freshing You may re-fresh both the front and back surfaces of the processed skin washed with high-pressure water to remove residual tissue debris on the front surface and subcutaneous tissue on the back surface. As a result, a processed dermis composed of a dermis layer having a higher purity can be obtained.

(10) Washing After freshening, it may be washed again. Examples of the washing method include a method of washing the skin with running water.

(11) Extraction From the obtained processed dermis composed of the dermis layer, gelatin-based glue is extracted with hot water. As the extraction method, a commonly used glue extraction method can be applied.

The obtained glue is concentrated and filtered as necessary, and then coagulated. The solidified glue is cut and then dried to obtain the desired solid glue.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited thereto.

Example 1
Using black beef rawhide with hair as the rawhide, the subcutaneous tissue, epidermis layer and hair root were removed from the rawhide by performing each of the following treatments in order, and the state in each step was observed. The temperature was measured using an AD-5616 radiation thermometer (A & D Company, Limited).

[1. Cleaning]
Rawhide with hair and water were placed in a leather drum (rotary stirrer) and stirred for about 10 minutes for washing. The raw hide was derived from domestic Japanese Black cattle, and the fresh one that had just been peeled at the slaughterhouse on the morning of the same day was used.

[2. Resection of outer edge and end site]
The tail, legs and abdomen were excised from the raw skin. By this treatment, about 30% by weight of the original raw hide was excised.

[3. Removal of subcutaneous tissue]
The subcutaneous tissue on the back surface of the raw skin was removed using a freshening machine. In the treatment, about 30% by weight was further removed from the raw hide after the treatment in step 2. That is, a total of about 50% by weight was removed from the original raw hide. The surface temperature of the raw leather and the floor temperature of the work room during the freshing process were about 19 ° C.

[4. Shaving]
A shaving treatment was performed using a hair clipper. The hair was shaved so that about 4 mm remained from the surface of the epidermal layer.

[5. Cleaning]
The skin was washed with running water to remove hair and the like shaved off in step 4. The water temperature was about 19 ° C.

[6. Heat treatment]
For the shaved fur that had been shaved, the epidermis layer was heat-treated under the following conditions (i) to (v). In order to prevent an excessive temperature rise of 100 ° C. or higher, the treatment was carried out with an appropriate amount of water contained in the hair left short on the skin surface.

The surface of the shaved fur was placed on the work table, and a hot trowel for leather (weight 13 kg, length 36 cm, width 22 cm) at about 120 to 160 ° C was placed on it. Since the temperature of the hot trowel cannot be adjusted and the skin surface temperature immediately becomes about 100 ° C. when the hot trowel is placed, the degree of heat treatment is adjusted by the length of time for placing the hot trowel on the skin surface. The treatment was performed by shifting the trowel laterally by half the width of the trowel (22 cm), that is, by 11 cm for each of the following unit times. Therefore, the heating time at each part of the skin surface is twice the unit time for placing the trowel. The skin surface temperature immediately before the treatment was about 20 ° C.
(i) Heat trowel placement unit time: 70 seconds / Heating time: 140 seconds The skin surface temperature immediately after the heat trowel was released was about 100 ° C, and then dropped sharply to about 60 ° C. After the treatment, only the epidermis layer was hardened and weakened.
(ii) Heat treatment unit time: 15 seconds / Heating time: 30 seconds It was observed that the epidermis layer remained soft even after the heat treatment, and the heat denaturation was insufficient. The skin surface temperature at the moment when the hot trowel was released was close to 100 ° C, but the temperature dropped rapidly thereafter.
(iii) Heat trowel placement unit time: 120 seconds / heating time: 240 seconds The heat treatment hardened and weakened the epidermis layer, and also shrunk in the plane direction to increase the thickness. In addition, wrinkles due to dragging occurred due to this relationship, and the continuation of work with a hot trowel became a little complicated. The skin surface temperature at the moment when the hot trowel was released was about 100 ° C, and the temperature drop after that was slow, and it was maintained at 80 ° C or higher for a while.
(iv) Heat iron placement unit time: 35 seconds / Heating time: 70 seconds The skin surface temperature at the moment when the heat iron was released was close to 100 ° C, and then the temperature dropped relatively quickly. After the treatment, only the epidermis layer was hardened and weakened.
(v) Heat trowel placement unit time: 0 seconds / Heating time: 0 seconds For comparison, no heat treatment was performed.

[7. Removal of epidermis layer]
The epidermis layer was removed from the shaved fur that had been heat-treated under each of the above conditions (i) to (v) using a high-pressure water washer. The environmental temperature was about 23 ° C.
(i) Heat iron placement unit time: 70 seconds / Heating time: 140 seconds As a result of high-pressure water washing, only the epidermis layer including the hair root tissue was sufficiently destroyed and removed.
(ii) Heat iron placement unit time: 15 seconds / Heating time: 30 seconds As a result of high-pressure water washing, it was somewhat difficult to destroy and remove the epidermis layer because the skin was too soft. Although it was possible to remove it, it was necessary to repeatedly wash it with high-pressure water, which sometimes damaged the dermis layer. As a result, a part of the skin was torn in step 8 described later.
(iii) Heat iron placement unit time: 120 seconds / Heating time: 240 seconds As a result of high-pressure water washing, the epidermis layer was sufficiently destroyed and removed, but heat denaturation progressed to the inside of the dermis layer and hardening and weakening progressed. Therefore, high-pressure water washing sometimes damaged the dermis layer and opened holes. From this, it was reconfirmed that it is desirable to selectively perform the heat treatment only on the epidermis layer and leave the dermis layer raw. Therefore, instead of using a hot trowel, the method of immersing the whole skin in boiling water seems to be unsuitable.
(iv) Heat iron placement unit time: 35 seconds / Heating time: 70 seconds As a result of high-pressure water washing, the epidermis layer was sufficiently destroyed and removed. This condition is more efficient in that the time required for heat treatment is shorter than that of condition (i). However, when the heat treatment conditions were tried in winter with an environmental temperature of about 10 ° C before the example, it was difficult to remove the epidermis in the high-pressure water washing process, and in such a low temperature environment, a higher-strength heat treatment (heat treatment). A unit time of about 70 seconds) was required.
(v) Heat iron placement unit time: 0 seconds / Heating time: 0 seconds As a result of high-pressure water washing, most of the hair could be removed, but the epidermis layer and the hair root tissue in it could hardly be removed, and the skin. Remained on the surface.

[8. Removal of residual tissue waste, etc.]
Both the front and back surfaces of the skin were treated once using a freshing machine to remove tissue debris on the front surface and subcutaneous tissue on the back surface.

[9. Cleaning]
The back surface of the skin was washed with high-pressure water for a short time to remove dirt and the like.

As described above, selectively heat-denaturing only the epidermis layer in step 6 was extremely effective in destroying and removing the epidermis layer including the hair root tissue in step 7. In this example, the effect is effective even under the conditions of about 100 ° C. and the heating time of 15 seconds / heating time of 30 seconds, but a longer treatment is desirable. On the other hand, under the conditions of about 100 ° C, a heating iron placement unit time of 120 seconds / heating time of 240 seconds, the dermis layer was thermally denatured, resulting in excessive treatment. In an environment of about 20 ° C, the task was successfully achieved under the conditions of about 100 ° C, hot iron mounting unit time 35 seconds / heating time 70 seconds, and hot iron mounting unit time 70 seconds / heating time 140 seconds. In particular, in terms of efficiency, the condition of heating iron placement unit time of 35 seconds / heating time of 70 seconds is more preferable. However, in an environment of about 10 ° C, the conditions of about 100 ° C and a heating time of 35 seconds / heating time of 70 seconds are somewhat insufficient, and processing with a heating iron placing unit time of about 70 seconds / heating time of about 140 seconds. Was preferred in some cases.

As described above, the technical feature of the present invention is that only the epidermis layer is selectively heat-modified by the heat treatment in step 6 to cure, reduce flexibility, and weaken the hair roots by high-pressure water washing in the next step 7. The point is that it enables destruction and removal of the epidermal layer including tissues. In this embodiment, since a heat iron for leather whose skin surface temperature becomes about 100 ° C immediately when placed is used, the effect of the present invention may not be obtained depending on the heating time, but the heating time of the present invention is It is not limited to the range of this embodiment, and can be appropriately set according to the temperature of hot water and the heating equipment used.

Example 2
Black beef rawhide with hair was used as the rawhide, and glue was produced under each of the following conditions.
(1) After shaving the raw skin, freshening both the front and back sides of the raw skin, and washing, the glue was extracted from the obtained processed skin with hot water (extraction temperature: 90 ° C, unit extraction time: 6 hours, extraction count). : 1).
(2) The residue after extracting glue in step (1) was used as a raw material and extracted again (extraction temperature: 90 ° C, unit extraction time: 6 hours, extraction count: 2).
(3) The residue after extracting glue in step (2) was used as a raw material for further extraction (extraction temperature: 90 ° C, unit extraction time: 6 hours, extraction count: 3).
(4) Glue was produced under the same conditions as in step (1).
(5) Glue was extracted with hot water from the processed skin produced by the method of condition (i) of Example 1 (extraction temperature: 90 ° C., unit extraction time: 6 hours, extraction count: 1).
(6) The residue after extracting glue in step (5) was used as a raw material and extracted again (extraction temperature: 90 ° C, unit extraction time: 6 hours, extraction count: 2).
(7) The residue after extracting glue in step (6) was used as a raw material for further extraction (extraction temperature: 90 ° C, unit extraction time: 6 hours, extraction count: 3).
(8) Glue was extracted with hot water from the processed skin produced by the method of condition (i) of Example 1 (extraction temperature: 80 ° C., unit extraction time: 48 hours, extraction count: 1).
* As the extraction solvent, 100% by weight of delicious water natural water Rokko (Asahi Soft Drinks Co., Ltd., hardness: about 40 mg / L, pH about 7) was used.
* After extracting each glue, 8 sheets of synthetic fiber paper 05TH-12 (manufactured by Hirose Paper Co., Ltd., polyester non-woven fabric, 12 g / m ² ) are stacked and filtered through a stainless steel container, and the filtrate is stirred uniformly. After that, it was solidified at 10 ° C in a polypropylene container. Then, it was cut into a square bar of about 205 × 8 × 8 mm, arranged on a polypropylene shelf, and air-dried at 10 ° C. to produce solid glue.

A photograph of glue produced under the above conditions (1) to (8) is shown in FIG. The glue produced under the conventional conditions (1) to (4) became darker due to the elution of hair and epidermal tissue. The glue manufactured under condition (4) was finished in bright color without any problem, but as can be seen from the comparison with the glue manufactured under the same condition (1), there was a problem with manufacturing stability (quality reproducibility). .. All the glues produced under the conditions (5) to (8) of the present invention were finished in light color without any problem, and it became possible to prepare light color glue with higher stability and a small amount of work.

Claims (7)

It is a method of producing glue from the raw skin, which consists of the subcutaneous tissue, the dermis layer, and the epidermis layer, and has many hairs growing from the epidermis layer.
The process of freshening the back surface of the raw skin to remove the subcutaneous tissue,
The process of shaving the hair growing on the surface of the raw skin,
The process of applying hot water to the surface of the obtained shaved fur and heat-treating it to harden and weaken the epidermis layer.
The process of removing the epidermis layer and hair from the surface of the heat-treated shaved fur,
A method for producing glue, which comprises a step of extracting glue with hot water from the processed dermis composed of the obtained dermis layer. The method for producing glue according to claim 1, wherein in the heat treatment step, water is supplied to the surface of the shaved fur, and then a hot iron is applied thereto to heat the water. Method. The method for producing glue according to claim 1 or 2, wherein the temperature of hot water in the heat treatment step is 50 to 150 ° C. The method for producing glue according to any one of claims 1 to 3, wherein in the shaving step, shaving is performed so that shortly cut hair remains on the surface of the raw skin. .. The method for producing glue according to any one of claims 1 to 4, wherein the removing step is performed by high-pressure water washing. The method for producing glue according to any one of claims 1 to 5, further comprising a step of freshening both the front and back surfaces of the heat-treated shaved fur. The method for producing glue according to any one of claims 1 to 6, wherein the extraction step is performed after washing the obtained processed skin.

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