A drying system and drying method for donkey-hide gelatin products

Abstract

The present invention provides a donkey-hide gelatin product drying system and drying method, and relates to the field of drying technology. The donkey-hide gelatin product drying system of the present invention is characterized by comprising a raw material tank, a vacuum drying oven, a vacuum crusher, a discharge tank, a vacuum feeder and a dry powder tank connected in sequence; wherein the vacuum drying oven is divided into a first medium temperature heating section, a high temperature heating section, a second medium temperature heating section, and a low temperature cooling section. By reasonably setting the drying temperature, the drying rate is fast, and the obtained donkey-hide gelatin powder has good uniformity, high dispersibility, and less agglomeration.

Description

Technical Field

[0001] The present invention relates to the technical field of donkey-hide gelatin drying, and in particular to a donkey-hide gelatin product drying system and drying method. Background Art

[0002] Donkey-hide gelatin is sweet and mild in nature. Its main functions are to nourish blood and yin, moisten dryness, and stop bleeding. Therefore, it is often used for blood deficiency and sallow complexion, dizziness and palpitations, muscle weakness, restlessness and insomnia, internal wind movement, dry lung cough, labor cough and blood, vomiting blood and urine, bloody stool and metrorrhagia, pregnancy and fetal bleeding, etc. Modern pharmacological studies have shown that donkey-hide gelatin has the effects of nourishing blood, improving immunity, and anti-oxidation. Donkey-hide gelatin is generally made of fresh or dried donkey skin as the main material. The production process of donkey-hide gelatin is to soak and wash the raw materials first, remove the dirt on the donkey skin, then melt it under high pressure, and then add auxiliary materials such as rice wine to boil it into gelatin.

[0003] Drying is an indispensable process in the production of donkey-hide gelatin. In the market, powder drying is mostly carried out by spray drying, constant temperature drying oven drying and other drying methods. However, donkey-hide gelatin has a high protein content, high viscosity, easy to agglomerate, absorb moisture, and easily gelatinize at high temperatures. When conventional methods are used for drying, problems such as agglomeration, wall adhesion and gelatinization are prone to occur, which directly affects the production efficiency of the product and also reduces the product quality. Therefore, it is necessary to provide a donkey-hide gelatin drying system and method. Summary of the invention

[0004] The purpose of the present invention is to provide a donkey-hide gelatin product drying system and drying method in view of the deficiencies in the prior art. The process is simple and has high production efficiency. The obtained donkey-hide gelatin powder is evenly crushed and has good dispersibility.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] On the one hand, a donkey-hide gelatin product drying system includes a raw material tank, a vacuum drying oven, a vacuum crusher, a discharge tank, a vacuum feeder and a dry powder tank connected in sequence; wherein,

[0007] The vacuum drying box is divided into a first medium-temperature heating section, a high-temperature heating section, a second medium-temperature heating section, and a low-temperature cooling section.

[0008] Furthermore, a feed pump is provided between the raw material tank and the first-stage drying device to control the feed.

[0009] Furthermore, in the vacuum drying oven, the temperature of the first medium-temperature heating section is 70-75°C, the temperature of the high-temperature heating section is 90-95°C, the temperature of the second medium-temperature heating section is 80-85°C, and the temperature of the low-temperature cooling section is 20-25°C; the vacuum degree in the vacuum drying oven is 0.1-1Kpa.

[0010] Furthermore, the first medium-temperature heating section, the high-temperature heating section and the second medium-temperature heating section of the vacuum drying box are respectively provided with water inlet pipes at the upper ends and water outlet pipes at the lower ends; hot water or steam is passed through the water inlet pipes to ensure heat preservation.

[0011] Furthermore, a Roots pump and a liquid ring pump which are connected in sequence through an air pipeline are installed at the upper end of the low-temperature cooling section of the vacuum drying box.

[0012] Furthermore, a spiral discharger is provided at the end of the low-temperature cooling section of the vacuum drying box.

[0013] Furthermore, a plurality of conveyor belts are arranged in the drying box; the material of the conveyor belts is PTFE; the speed of the conveyor belts is 15-20 cm / min. The plurality of conveyor belts can convey materials at the same time, which can speed up the work efficiency and ensure the drying effect. The conveyor belts made of PTFE material are not easy to stick to the materials and are easier to clean.

[0014] By adopting the above system, under vacuum conditions, the liquid material donkey-hide gelatin product enters the vacuum drying box from the raw material tank, forms a thin coating on the conveyor belt, and passes through the first medium-temperature heating section, the high-temperature heating section, and the second medium-temperature heating section in turn. The material evaporates due to heat and removes moisture, and then enters the low-temperature cooling section. The material becomes brittle due to cooling and completes drying. It is then discharged from the spiral discharging device and enters the vacuum crusher. After being crushed into powder by the vacuum crusher, it enters the unloading tank, and finally enters the dry powder tank through the vacuum loader for packaging.

[0015] On the other hand, the above-mentioned donkey-hide gelatin product drying system is used in the drying of donkey-hide gelatin products.

[0016] In another aspect, a method for drying donkey-hide gelatin products is provided, wherein the drying method is implemented by the above-mentioned donkey-hide gelatin product drying system; the drying method comprises the following steps:

[0017] S1. Feeding: Add donkey-hide gelatin products into the raw material tank and start the feed pump to feed;

[0018] S2, vacuum drying: The donkey-hide gelatin product is transported to a vacuum drying oven through a feed pump for vacuum drying, and passes through the first medium temperature heating section, the high temperature heating section, the second medium temperature heating section, and the low temperature cooling section in sequence to complete the drying;

[0019] S3. Crushing: The dried donkey-hide gelatin product enters the crusher and is crushed into powder. Finally, it enters the dry powder tank through the vacuum feeder to obtain donkey-hide gelatin powder.

[0020] Furthermore, in step S2, the conditions of the vacuum drying oven are: the temperature of the first medium-temperature heating section is 70-75°C, the temperature of the high-temperature heating section is 90-95°C, the temperature of the second medium-temperature heating section is 80-85°C, and the temperature of the low-temperature cooling section is 20-25°C; the vacuum degree in the vacuum drying oven is -0.1-0.1Mpa.

[0021] Furthermore, the donkey-hide gelatin product comprises a core material and a wall material; the core material comprises donkey-hide gelatin, and the wall material comprises sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate; wherein,

[0022] The sorbitan stearate in the wall material comprises sorbitan monostearate and sorbitan tristearate in a mass ratio of (2-3):1.

[0023] Preferably, the sorbitan stearate in the wall material comprises sorbitan monostearate and sorbitan tristearate in a mass ratio of 2.6:1.

[0024] Preferably, the mass ratio of sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate in the wall material is 1:(3-5):(0.1-0.3).

[0025] More preferably, the mass ratio of sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate in the wall material is 1:3.5:0.2.

[0026] Furthermore, the donkey-hide gelatin product is prepared by the following method:

[0027] (1) Adding water to the donkey-hide gelatin to dissolve it into a gelatin solution to obtain the core material;

[0028] (2) Sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate are mixed as wall materials, and added into the core materials for embedding in a mass ratio of wall material to core material of 1:4-6, thereby obtaining donkey-hide gelatin products.

[0029] Preferably, in step (1), the mass volume ratio of the donkey-hide gelatin to water is 1:10-12.

[0030] Preferably, in step (2), the encapsulation process is carried out at a temperature of 30 to 40° C. and a microencapsulation time of 1 to 2 hours.

[0031] Preferably, before the donkey-hide gelatin product is added to the raw material tank, the method further comprises: subjecting the donkey-hide gelatin product to microwave treatment twice; wherein:

[0032] The power of the first microwave treatment is 200-300W, the pressure of the microwave treatment is 10-30kPa, and the time of the microwave treatment is 5-10min;

[0033] The power of the second microwave treatment is 200-300 W, the pressure of the microwave treatment is 30-50 kPa, and the time of the microwave treatment is 10-20 min.

[0034] The present invention performs two microwave treatments before vacuum drying the microencapsulated donkey-hide gelatin product, and applies pressure during the microwave treatment process. The solubility of the donkey-hide gelatin product after the treatment of the present invention is improved, and the dispersibility of the final product donkey-hide gelatin powder is further improved, which can ensure the consistency of the donkey-hide gelatin powder, improve its fluidity, and make it easier to granulate.

[0035] Furthermore, in step S2, the feeding speed of the donkey-hide gelatin product to the vacuum drying oven is 25-27 kg / h, and the speed of the conveyor belt is 25-27 cm / min.

[0036] On the other hand, a donkey-hide gelatin powder is prepared by the above-mentioned donkey-hide gelatin product drying system or donkey-hide gelatin product drying method.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The donkey-hide gelatin product drying system and process provided by the present invention have simple process methods and fast drying rates. The prepared donkey-hide gelatin powder has good uniformity, less caking, less moisture absorption during storage, and is not easy to stick together.

[0039] 2. The present invention adopts a drying method of three stages of medium-high temperature and one stage of low temperature, with the highest temperature below 100°C, which can reduce the destruction of protein, amino acid and characteristic polypeptide components in donkey-hide gelatin; the reasonable design of the temperature of the three stages of medium-high temperature is helpful to speed up the drying efficiency, reduce caking and improve dispersibility; controlling the low-temperature vacuum drying temperature in the range of 20-25°C can not only speed up the drying speed, but also cool the material to make it brittle and easy to crush; the three-stage high-temperature drying and low-temperature drying cooperate with each other, which not only speeds up the drying efficiency, but also makes the product particle size of the obtained donkey-hide gelatin powder more uniform, improves dispersibility, reduces caking, and reduces moisture absorption during storage.

[0040] 3. A certain proportion of sorbitan monostearate and sorbitan tristearate is added to the wall material of the donkey-hide gelatin product of the present invention, and the mixture is matched with other wall materials. The obtained donkey-hide gelatin powder has no fishy smell, good taste, and will not affect the dispersibility of the donkey-hide gelatin powder. The product has good fluidity, is not easy to absorb moisture and stick during storage, and has better stability.

[0041] 4. The donkey-hide gelatin product of the present invention is subjected to two microwave treatments before being dried by the drying system, which helps to improve the dispersibility of the final donkey-hide gelatin powder, ensure the consistency of the donkey-hide gelatin powder, improve its fluidity, and make it easier to granulate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flow chart of the drying method of donkey-hide gelatin product of the present invention;

[0043] Figure 2 1 is a schematic diagram of a drying system for donkey-hide gelatin products of the present invention; in the figure, 1-raw material tank, 2-feed pump, 3-vacuum drying oven, 31-first medium-temperature heating section, 32-high-temperature heating section, 33-second medium-temperature heating section, 4-low-temperature cooling section, 5-screw discharger, 6-vacuum crusher, 7-discharging tank, 8-vacuum feeder, 9-dry powder tank, 10-conveyor belt, 11-water inlet pipe, 12-water outlet pipe, 13-gas pipeline, 14-Roots pump, 15-liquid ring pump. DETAILED DESCRIPTION

[0044] The following non-limiting examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. The following content is only an exemplary description of the scope of the present invention, and those skilled in the art can make various changes and modifications to the invention of the present invention based on the disclosed content, and they should also fall within the scope of the present invention.

[0045] The embodiment of the present invention provides a method for drying donkey-hide gelatin products, the flow chart of which is as follows: Figure 1 As shown, including:

[0046] S1. Feeding: Add donkey-hide gelatin products into the raw material tank and start the feed pump to feed;

[0047] S2, vacuum drying: the donkey-hide gelatin product is transported to a vacuum drying oven by a feed pump for vacuum drying, and passes through the first medium temperature heating section, the high temperature heating section, the second medium temperature heating section, and the low temperature cooling section in sequence to complete the drying; the temperature of the first medium temperature heating section is 70-75°C, the temperature of the high temperature heating section is 90-95°C, the temperature of the second medium temperature heating section is 80-85°C, and the temperature of the low temperature cooling section is 20-25°C; the vacuum degree in the vacuum drying oven is 0.1-1Kpa;

[0048] S3. Crushing: The dried donkey-hide gelatin product enters the crusher and is crushed into powder. Finally, it enters the dry powder tank through the vacuum feeder to obtain donkey-hide gelatin powder.

[0049] The donkey-hide gelatin product drying method in the embodiment of the present invention is implemented by using the following donkey-hide gelatin product drying system.

[0050] like Figure 2 As shown, the donkey-hide gelatin product drying system includes a raw material tank 1, a vacuum drying box 3, a vacuum crusher 6, a discharge tank 7, a vacuum feeder 8 and a dry powder tank 9 which are connected in sequence.

[0051] The vacuum drying box 3 is divided into: a first medium-temperature heating section 31 , a high-temperature heating section 32 , a second medium-temperature heating section 33 ; and a low-temperature cooling section 4 .

[0052] A feed pump 2 is also provided between the raw material tank 1 and the vacuum drying box 3 to control the feed.

[0053] The upper end of the vacuum drying box 3 is respectively provided with a water inlet pipe 11 and the lower end is provided with a water outlet pipe 12; hot water or steam is passed through the water inlet pipe to ensure heat preservation;

[0054] A Roots pump 14 and a liquid ring pump 15 which are connected in sequence through an air pipeline 13 are installed on the upper end of the low-temperature cooling section 4 .

[0055] Three conveyor belts 10 are arranged in the vacuum drying box 3. Multiple conveyor belts can convey materials at the same time, speed up work efficiency, and ensure drying effect at the same time. The material of the conveyor belt is PTFE. By using the conveyor belt of PTFE material, the materials are not easy to stick and are easier to clean.

[0056] A spiral discharger 5 is provided at the end of the low-temperature cooling section 4 .

[0057] The present invention is further described below by way of specific examples, and the following examples are all adopted. Unless otherwise specified, the various chemical reagents used in the examples of the present invention are obtained through conventional commercial channels.

[0058] Example 1

[0059] A method for drying donkey-hide gelatin products comprises the following steps:

[0060] S1. Feeding: Add the donkey-hide gelatin product into the raw material tank and turn on the feed pump.

[0061] S2, vacuum drying: the donkey-hide gelatin product is transported to the vacuum drying oven, the feeding speed is 22L / h, the conveyor belt speed is 22cm / min, and it passes through the first medium temperature heating section, the high temperature heating section, the second medium temperature heating section, and the low temperature cooling section in sequence to complete the drying; wherein,

[0062] The temperature of the first medium-temperature heating section is 70°C, the temperature of the high-temperature heating section is 90°C, the temperature of the second medium-temperature heating section is 80°C, and the temperature of the low-temperature cooling section is 20°C; the vacuum degree in the vacuum drying oven is 1Kpa.

[0063] S3. Crushing: It enters the crusher and is crushed into powder. Finally, it enters the dry powder tank through the vacuum feeder to obtain donkey-hide gelatin powder.

[0064] Among them, the donkey-hide gelatin product is prepared by the following method:

[0065] Add water (mass to volume ratio of 1:10) to dissolve donkey-hide gelatin into donkey-hide gelatin liquid to obtain core material; mix sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate (including sorbitan monostearate and sorbitan monolaurate in a mass ratio of 2:1) in a mass ratio of 1:3:0.1 as wall material, and add them into the core material in a mass ratio of 1:4 to the wall material for embedding to obtain donkey-hide gelatin product.

[0066] Example 2

[0067] Another method for drying donkey-hide gelatin products comprises the following steps:

[0068] S1. Feeding: Add the donkey-hide gelatin product into the raw material tank and turn on the feed pump.

[0069] S2, vacuum drying: the donkey-hide gelatin product is transported to the vacuum drying oven, the feeding speed is 23L / h, the conveyor belt speed is 23cm / min, and it passes through the first medium temperature heating section, the high temperature heating section, the second medium temperature heating section, and the low temperature cooling section in sequence to complete the drying; wherein,

[0070] The temperature of the first medium-temperature heating section is 70°C, the temperature of the high-temperature heating section is 90°C, the temperature of the second medium-temperature heating section is 80°C, and the temperature of the low-temperature cooling section is 20°C; the vacuum degree in the vacuum drying oven is 1Kpa.

[0071] S3. Crushing: It enters the crusher and is crushed into powder. Finally, it enters the dry powder tank through the vacuum feeder to obtain donkey-hide gelatin powder.

[0072] Among them, the donkey-hide gelatin product is prepared by the following method:

[0073] Add water (mass to volume ratio of 1:10) to dissolve donkey-hide gelatin into donkey-hide gelatin liquid to obtain core material; mix sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate (comprising sorbitan monostearate and sorbitan monolaurate in a mass ratio of 2.6:1) in a mass ratio of 1:3.5:0.2 as wall material, add them into the core material in a mass ratio of 1:5 to embed, and obtain donkey-hide gelatin product.

[0074] Example 3

[0075] Another method for drying donkey-hide gelatin products comprises the following steps:

[0076] S1. Feeding: Add the donkey-hide gelatin product into the raw material tank and turn on the feed pump.

[0077] S2, vacuum drying: the donkey-hide gelatin product is transported to a vacuum drying oven, the feed rate is 25L / h, the conveyor belt speed is 25cm / min, and it passes through the first medium temperature heating section, the high temperature heating section, the second medium temperature heating section, and the low temperature cooling section in sequence to complete the drying; wherein,

[0078] The temperature of the first medium-temperature heating section is 70°C, the temperature of the high-temperature heating section is 90°C, the temperature of the second medium-temperature heating section is 80°C, and the temperature of the low-temperature cooling section is 20°C; the vacuum degree in the vacuum drying oven is 1Kpa.

[0079] S3. Crushing: It enters the crusher and is crushed into powder. Finally, it enters the dry powder tank through the vacuum feeder to obtain donkey-hide gelatin powder.

[0080] Among them, the donkey-hide gelatin product is prepared by the following method:

[0081] Add water (mass to volume ratio of 1:10) to dissolve donkey-hide gelatin into donkey-hide gelatin liquid to obtain core material; mix sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate (comprising sorbitan monostearate and sorbitan monolaurate in a mass ratio of 3:1) in a mass ratio of 1:5:0.3 as wall material, add the mixture into the core material in a mass ratio of 1:5 to the core material for embedding, and obtain donkey-hide gelatin product.

[0082] Example 4

[0083] Another method for drying donkey-hide gelatin products is different from that of Example 2 in that the donkey-hide gelatin products are subjected to two microwave treatments before being added to the raw material tank; wherein:

[0084] The power of the first microwave treatment is 200 W, the pressure of the microwave treatment is 30 kPa, and the time of the microwave treatment is 10 min;

[0085] The power of the second microwave treatment was 200 W, the pressure of the microwave treatment was 50 kPa, and the time of the microwave treatment was 20 min.

[0086] Example 5

[0087] Another method for drying donkey-hide gelatin products is different from that of Example 4 in that the conditions for the two microwave treatments are:

[0088] The power of the first microwave treatment is 300 W, the pressure of the microwave treatment is 10 kPa, and the time of the microwave treatment is 5 min;

[0089] The power of the second microwave treatment was 300 W, the pressure of the microwave treatment was 30 kPa, and the time of the microwave treatment was 10 min.

[0090] Example 6

[0091] Another method for drying donkey-hide gelatin products is different from Example 4 in that, during the preparation of donkey-hide gelatin products, the power of the two microwave treatments is 150 W, the pressure is 5 kPa, and the time is unchanged.

[0092] Example 7

[0093] Another method for drying donkey-hide gelatin products is different from Example 4 in that, during the preparation of donkey-hide gelatin products, the power of the two microwave treatments is 350 W, the pressure is 60 kPa, and the time remains unchanged.

[0094] Example 8

[0095] Another method for drying donkey-hide gelatin products is different from Example 4 in that no pressure is applied during the two microwave treatments.

[0096] Example 9

[0097] Another method for drying donkey-hide gelatin products is different from Example 4 in that only one microwave treatment is performed, and the microwave treatment conditions are the same as the first microwave treatment conditions.

[0098] Example 10

[0099] Another method for drying donkey-hide gelatin products is different from Example 4 in that only one microwave treatment is performed, and the microwave treatment conditions are the same as the second microwave treatment conditions.

[0100] Comparative Example 1

[0101] Another method for drying donkey-hide gelatin products, which differs from Example 2 in that, in this comparative example, the temperature of the first medium-temperature heating section is 60°C, the temperature of the high-temperature heating section is 88°C, the temperature of the second medium-temperature heating section is 78, and the temperature of the low-temperature cooling section is 20°C; the vacuum degree in the vacuum drying oven is 1Kpa.

[0102] Comparative Example 2

[0103] Another method for drying donkey-hide gelatin products, which differs from Example 2 in that, in this comparative example, the temperature of the first medium-temperature heating section is 80°C, the temperature of the high-temperature heating section is 98°C, the temperature of the second medium-temperature heating section is 90, and the temperature of the low-temperature cooling section is 30°C; the vacuum degree in the vacuum drying oven is 1Kpa.

[0104] Comparative Example 3

[0105] Another method for drying donkey-hide gelatin products, which differs from Example 2 in that, in this comparative example, the temperature of the first medium-temperature heating section is 85°C, the temperature of the high-temperature heating section is 92°C, the temperature of the second medium-temperature heating section is 93°C, and the temperature of the low-temperature cooling section is 25°C; the vacuum degree in the vacuum drying oven is 1 Kpa.

[0106] Comparative Example 4

[0107] Another method for drying donkey-hide gelatin products, which differs from Example 2 in that, in this comparative example, the temperature of the first medium-temperature heating section is 85°C, the temperature of the high-temperature heating section is 92°C, the temperature of the second medium-temperature heating section is 93°C, and there is no low-temperature cooling section; the vacuum degree in the vacuum drying oven is 1Kpa.

[0108] Comparative Example 5

[0109] Another method for drying donkey-hide gelatin products is different from Example 2 in that the sorbitan stearate in the donkey-hide gelatin product in this comparative example is only sorbitan monostearate, and the total amount thereof remains unchanged.

[0110] Comparative Example 6

[0111] Another method for drying donkey-hide gelatin products is different from Example 2 in that the sorbitan stearate in the donkey-hide gelatin product in this comparative example is only sorbitan tristearate, and the total amount thereof remains unchanged.

[0112] Comparative Example 7

[0113] Another method for drying donkey-hide gelatin products is different from Example 2 in that the sorbitan stearate in the donkey-hide gelatin product in this comparative example comprises sorbitan monostearate and sorbitan tristearate in a mass ratio of 1:1.

[0114] Comparative Example 8

[0115] Another method for drying donkey-hide gelatin products is different from Example 2 in that the sorbitan stearate in the donkey-hide gelatin product in this comparative example comprises sorbitan monostearate and sorbitan tristearate in a mass ratio of 4:1.

[0116] Comparative Example 9

[0117] Another method for drying donkey-hide gelatin products is different from that of Example 2 in that sorbitan stearate is not added to the wall material of the donkey-hide gelatin product in this comparative example.

[0118] Comparative Example 10

[0119] Another method for drying donkey-hide gelatin products is different from that of Example 2 in that the feed rate of the donkey-hide gelatin products is 20 L / h and the conveyor belt speed is 20 cm / min.

[0120] Comparative Example 11

[0121] Another method for drying donkey-hide gelatin products is different from that of Example 2 in that the feed rate of the donkey-hide gelatin product is 27 L / h and the conveyor belt speed is 27 cm / min.

[0122] Test Example 1

[0123] The obtained donkey-hide gelatin powder was tested according to the "Shandong Province Traditional Chinese Medicine Processing Standards" and the "Chinese Pharmacopoeia". The results are shown in Table 1 below.

[0124] Table 1

[0125]

[0126] The results showed that the characteristic polypeptide content in the donkey-hide gelatin powder prepared by the method provided by the present invention was about 0.2% (≥0.15%), the moisture content was below 5%, which met the requirements, and the amino acid content also met the requirements.

[0127] Test Example 2

[0128] Drying rate

[0129] The mass of donkey-hide gelatin powder dried to a moisture content of less than 5% per unit time is the drying rate. The measured results are shown in Table 2 below.

[0130] Table 2

[0131]

[0132] As shown in the table, compared with Comparative Examples 1, 3 and 4, the drying rate of the embodiment is significantly higher than that of the comparative example, which shows that the drying method provided by the present invention can significantly improve the drying rate. The feed speed of Comparative Examples 10 and 11 is too fast or too slow, and its drying rate is lower than that of Example 2. It can be seen that selecting a suitable feed speed helps to speed up the drying rate. It can also be seen that in Examples 4 and 5, the donkey-hide gelatin product is first pretreated and then treated with a drying system, which can speed up the drying rate.

[0133] Test Example 3

[0134] Determination of caking degree: Calculate by bulk density. Weigh 100g of donkey-hide gelatin powder (mass M) into a measuring cylinder, record the volume V0, and calculate the bulk density according to the formula M / V0.

[0135] Determination of sieving rate: The donkey-hide gelatin powder prepared by the above different methods was passed through a 100-mesh sieve and a 200-mesh sieve, and the sieving rate was calculated. The sieving rate = (mass of sieved donkey-hide gelatin powder / total mass of donkey-hide gelatin powder) × 100%.

[0136] Dispersibility determination: Add 100 mL of water to a beaker, add 10 g of donkey-hide gelatin powder, and record the time required for complete dispersion.

[0137] The results are shown in Table 3 below.

[0138] Table 3

[0139]

[0140] As shown in the table, the bulk density of the donkey-hide gelatin powder prepared by the present invention is less than 0.4g / mL, the bulk density is low, the agglomeration is small, the particle size is uniform, and the dispersibility is good. Compared with Example 2, the bulk density of the donkey-hide gelatin powder obtained in Examples 4 and 5 is significantly reduced, and the particle size of the donkey-hide gelatin powder is more uniform. Compared with Example 2, the bulk density of the donkey-hide gelatin powder obtained in Comparative Examples 1-4 increases, the agglomeration increases, the uniformity of the particle size increases, and the dispersibility deteriorates. It can be seen that the setting of the vacuum drying temperature will affect the product quality of the donkey-hide gelatin powder. The bulk density of Comparative Examples 5-9 also increases compared with Example 2, the uniformity of the particle size decreases, and the dispersibility decreases, indicating that the components in the embedding process of the donkey-hide gelatin product have a certain influence on the drying process, thereby causing the quality of the donkey-hide gelatin powder to decrease. The bulk density, uniformity of the particle size, and dispersibility of Comparative Examples 10 and 11 are somewhat different from those of Example 2, indicating that the feeding speed is too fast or too slow and will affect the quality of the donkey-hide gelatin powder.

[0141] Test Example 4

[0142] Put donkey-hide gelatin powder in a weighing bottle and dry it at 105℃ to a constant mass, the mass is recorded as m1. Put the desiccator containing the supersaturated NaCl solution in a 25℃ constant temperature incubator, keep the constant temperature for 24 hours, and the relative humidity is 75%. Put the accurately weighed mass of dry donkey-hide gelatin powder into the desiccator, open the weighing bottle cap, store it at 25℃, weigh the mass after 48 hours, record the mass as m2, and calculate the moisture absorption rate, moisture absorption rate = [(m2-m1) / m1]×100%. The measured results are shown in Table 4 below.

[0143] Table 4

[0144]

[0145] As shown in the table, the donkey-hide gelatin powder prepared by the present invention has a low moisture absorption rate, is not easy to absorb moisture and form agglomeration, does not stick during storage, and is easy to granulate. Compared with Example 2, the moisture absorption rate of Examples 4 and 5 is reduced, and the storage stability is further improved. The moisture absorption rate of the donkey-hide gelatin powder obtained in Comparative Examples 1-4 is significantly improved, indicating that too fast or too slow drying temperature is not conducive to improving the stability of the donkey-hide gelatin powder during storage. The moisture absorption rate of the donkey-hide gelatin powder obtained in Comparative Examples 5-7 is significantly higher than that in Example 2, which shows that the components of the donkey-hide gelatin powder have a greater influence on its moisture absorption during storage.

[0146] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A donkey-hide gelatin product drying system, characterized in that: It includes a raw material tank, a vacuum drying oven, a vacuum crusher, a discharge tank, a vacuum feeder and a dry powder tank connected in sequence; wherein, The vacuum drying oven is divided into a first medium temperature heating section, a high temperature heating section, a second medium temperature heating section, and a low temperature cooling section; The temperature of the first medium-temperature heating section is 70-75°C, the temperature of the high-temperature heating section is 90-95°C, the temperature of the second medium-temperature heating section is 80-85°C, and the temperature of the low-temperature cooling section is 20-25°C; the vacuum degree in the vacuum drying oven is 0.1-1 kPa; The donkey-hide gelatin product is prepared by the following method: (1) Adding water to the donkey-hide gelatin to dissolve it into a gelatin solution to obtain the core material; (2) Mix sodium carboxymethyl cellulose, β-cyclodextrin and sorbitan stearate as the wall material, add the mixture into the core material in a mass ratio of 1:(4-6) for embedding, and obtain donkey-hide gelatin product; The sorbitan stearate comprises sorbitan monostearate and sorbitan tristearate in a mass ratio of (2-3):1; The mass ratio of sodium carboxymethyl cellulose, beta-cyclodextrin and sorbitan stearate is 1:(3-5):(0.1-0.3).

2. The donkey-hide gelatin product drying system according to claim 1, characterized in that: A feed pump is also provided between the raw material tank and the vacuum drying oven; The first medium-temperature heating section, the high-temperature heating section and the second medium-temperature heating section of the vacuum drying box are respectively provided with water inlet pipes at the upper ends and water outlet pipes at the lower ends; A Roots pump and a liquid ring pump connected in sequence through an air pipeline are installed at the upper end of the low-temperature cooling section of the vacuum drying box; A spiral discharger is arranged at the end of the low-temperature cooling section of the vacuum drying box.

3. A method for drying donkey-hide gelatin products, characterized in that: This is achieved through the donkey-hide gelatin product drying system described in claim 1 or 2.

4. The drying method according to claim 3, characterized in that: The following steps are involved: S1. Feeding: Add donkey-hide gelatin products into the raw material tank and start the feed pump to feed; S2, vacuum drying: The donkey-hide gelatin product is transported to a vacuum drying oven through a feed pump for vacuum drying, and passes through the first medium temperature heating section, the high temperature heating section, the second medium temperature heating section, and the low temperature cooling section in sequence to complete the drying; S3. Crushing: The dried donkey-hide gelatin product enters the crusher and is crushed into powder. Finally, it enters the dry powder tank through the vacuum feeder to obtain donkey-hide gelatin powder.

5. The drying method according to claim 4, characterized in that: Before the donkey-hide gelatin product is added to the raw material tank, the donkey-hide gelatin product is subjected to two microwave treatments; wherein, The power of the first microwave treatment is 200-300W, the pressure of the microwave treatment is 10-30kPa, and the time of the microwave treatment is 5-10min; The power of the second microwave treatment is 200-300 W, the pressure of the microwave treatment is 30-50 kPa, and the time of the microwave treatment is 10-20 min.

6. The drying method according to claim 4, characterized in that: The feeding speed of the donkey-hide gelatin product to the vacuum drying oven is 25-27 kg / h.

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