CN113243432A - Processing method of white tea - Google Patents
Processing method of white tea Download PDFInfo
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- CN113243432A CN113243432A CN202110678628.7A CN202110678628A CN113243432A CN 113243432 A CN113243432 A CN 113243432A CN 202110678628 A CN202110678628 A CN 202110678628A CN 113243432 A CN113243432 A CN 113243432A
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- tea
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- white tea
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/06—Treating tea before extraction; Preparations produced thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
- F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/20—Teas, i.e. drying, conditioning, withering of tea leaves
Abstract
The application discloses a processing method of white tea, which belongs to the technical field of tea processing and comprises the following steps: picking: selecting primarily-spread tea leaves which are free of diseases and insect pests and have complete and good appearance, wherein one bud and one leaf are picked, and the length of a tea handle is 0.3-05 cm during picking; withering: placing the picked fresh leaves in a bamboo plaque, wherein the laying thickness is 0.5-3 cm, and the tea leaves are laid uniformly and cannot be turned over; drying: drying the withered tea leaves in a dryer; and (3) storage: putting the dried white tea into a normal-temperature warehouse for sealed preservation at the temperature of about 20 ℃; the drying machine in the third step comprises a box body, wherein a plurality of tea containing trays for containing tea are arranged in the box body, an air inlet and a heating mechanism are arranged at the bottom of the box body, a temperature adjusting device is arranged on the heating mechanism, and an air exhaust port and an air exhaust mechanism for exhausting hot air in the box body from the air exhaust port are arranged at the top of the box body. The problem that drying efficiency is slow in present white tea course of working has been solved to this scheme.
Description
Technical Field
The invention relates to the technical field of tea processing, in particular to a processing method of white tea.
Background
White tea, belonging to micro-fermented tea, is a special treasure in Chinese tea. The finished tea is mostly bud heads, is full of pekoe, is named after snow-like silver, and is one of six Chinese teas. The white tea is processed by drying in the sun or by slow fire without deactivating enzymes or rolling, and has the quality characteristics of complete bud, complete whole body, fragrant and fresh taste, yellow green and clear soup color, light taste and sweet taste after processing. In the drying process of the white tea, the white tea needs to be dried firstly, then the dried tea leaves are taken out and spread for cooling for about 15 minutes and dried again, and then the white tea after re-drying is placed in an ice house for storage. However, in the processing method, the tea leaves are taken out to be cooled after drying is finished, so that moisture in the tea leaves is quickly dissipated under the action of hot air, and meanwhile, the phenomenon that water vapor in equipment enters the tea leaves again is avoided, and then re-drying is carried out, so that the drying effect is further enhanced. Therefore, a processing method capable of accelerating the drying time of the white tea is needed at present.
Disclosure of Invention
The invention aims to provide a processing method of white tea, which aims to solve the problem of low drying efficiency in the existing white tea processing process.
In order to solve the technical problems, the invention provides the following technical scheme: a processing method of white tea comprises the following steps:
step one, picking: selecting primarily-spread tea leaves which are free of diseases and insect pests and have complete and good appearance, wherein one bud and one leaf are picked, and the length of a tea handle is 0.3-0.5 cm during picking;
step two, withering: placing the picked fresh leaves in a cooling sieve of a withering room, wherein the laying thickness is 0.5-3 cm, the tea leaves are required to be uniform in thickness and cannot be turned, and the withering time is about 20-24 hours; in the withering process, the temperature is set from low to high, and the humidity is set from high to low; the temperature is 20-30 ℃, the humidity is 75-60%, and the circulation control is carried out;
step three, drying: drying the withered tea leaves in a dryer at a temperature not exceeding 80 ℃ and keeping the water content at 8-10%;
step four, storage: putting the dried white tea into a storehouse provided with an air dehumidifier for sealed storage, wherein the temperature is 18-20 ℃, and the relative humidity of air is controlled below 60%;
the drying machine in the third step comprises a box body, wherein a plurality of tea containing trays for containing tea are arranged in the box body, an air inlet and a heating mechanism are arranged at the bottom of the box body, a temperature adjusting device is arranged on the heating mechanism, and an air exhaust port and an air exhaust mechanism for exhausting hot air in the box body from the air exhaust port are arranged at the top of the box body.
The invention has the following working principle and beneficial effects: during the stoving step in the course of working of white tea in this scheme, generate heat through the mechanism that generates heat, the tealeaves of production heat in to adorning the tea tray is dried, and moisture in the tealeaves is heated the evaporation and is floated at the interior top of box, starts the mechanism of bleeding this moment, discharges the steam in the box from the gas vent when the mechanism of bleeding moves, ensures that the internal humidity of box can not be too high. When the mechanism of bleeding is with steam discharge box, because the atmospheric pressure of box is less than external atmospheric pressure, consequently during external air enters into the box through the air inlet under the effect of atmospheric pressure, the moisture with in the box is discharged in the circulation like this, guarantees the degree of dryness in the stoving in-process box, has effectively avoided the stoving in-process tealeaves moisture content to reduce the back, can absorb steam like in tealeaves again, leads to the stoving effect poor, the condition that needs to dry by the fire again. Moreover, this scheme can carry out temperature regulation to the mechanism that generates heat through temperature regulation apparatus, controls the temperature of stoving in-process. Therefore, when the white tea is processed and dried by the scheme, the drying efficiency is high, and the white tea can be dried once without re-drying.
Further, a plurality of tea containing trays are detachably connected in the box body from top to bottom, and each tea containing tray is provided with a plurality of air holes. Its purpose makes a plurality of dress tea trays of dress tea tray extremely can dismantle the connection in the box from top to bottom, is convenient for put and take out tealeaves through this kind of mode, increases the gas permeability through the bleeder vent on the dress tea tray simultaneously, and the steam of being convenient for passes from the bleeder vent, reinforcing stoving effect.
Further, the air inlet sets up the center department of bottom half, air inlet department fixedly connected with vertical intake pipe, and intake pipe position and air inlet intercommunication, the bottom of intake pipe is equipped with the filter. The dust filter has the advantages that dust in the outside air is filtered through the filter plate, and the dust in the outside air is prevented from being attached to tea leaves, so that the cleanliness of the tea leaves is reduced.
Further, the filter includes the casing, casing and intake pipe threaded connection, casing center department is equipped with dodges the mouth, dodges the filter layer that intraoral fixedly connected with sponge was made. The purpose is that the filter layer is convenient to detach and replace after being dirty through the arrangement.
Further, the heating mechanism comprises an electric heating screen plate formed by an electric heating wire, the electric heating screen plate is coiled into a cylinder shape, the electric heating screen plate is fixedly connected in the air inlet pipe, and the electric heating screen plate is coaxial with the air inlet pipe. The electric heating net plate can heat the outside air when the outside air enters the air inlet pipe, and the air can be fully heated when passing through the electric heating net plate because the electric heating net plate is rolled into a cylinder, so that the temperature of the heated air is ensured to be sufficient.
Further, the temperature adjusting device is a device for adjusting the voltage, and the temperature adjusting device is connected with a power circuit of the electric heating screen plate in series. The temperature adjusting device is used for adjusting the voltage of a power supply circuit, so that the effect of adjusting the heat productivity of the electric heating screen plate is realized, the heat productivity of the electric heating screen plate is reduced when the voltage is reduced, and the heat productivity of the electric heating screen plate is increased when the voltage is increased.
Further, the air exhaust mechanism comprises an exhaust pipe, the exhaust pipe is evenly laid on the inner top of the box body, a plurality of air inlets are formed in the exhaust pipe, the air outlet end of the exhaust pipe penetrates through the box body and is located outside the box body, and the air outlet end of the exhaust pipe is communicated with an air extractor. The air suction device is used for sucking air when the air extractor operates, so that negative pressure is formed in the exhaust pipe, then the exhaust pipe sucks water vapor in the box body into the exhaust pipe through the air inlet holes, and then the water vapor is discharged through the air outlet end of the exhaust pipe.
Further, a power switch used for controlling the start and stop of the electric heating screen is fixedly connected outside the box body. The electric heating net plate heating device is used for stopping heating of the electric heating net plate through the power switch after tea leaves are dried, then only the air extractor is started, and cold air outside is sucked into the box body through the air extractor, so that the tea leaves can be rapidly cooled.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a dryer according to the present invention;
fig. 2 is a top view of the electric heat net plate in fig. 1.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the tea-making machine comprises an air extractor 1, an exhaust pipe 2, an air inlet 3, a tea tray 4, an air vent 5, a chute 6, a temperature adjusting device 7, a box body 8, a support frame 9, a filter layer 10, an air inlet pipe 11, an electric heating screen plate 12 and a shell 13.
Example 1
A processing method of white tea comprises the following steps:
step one, picking: the tea is picked from the initially-spread tea leaves which are free of diseases and insect pests and have complete and good appearance, and one bud and one leaf, and the length of the tea stalk is 0.3-0.5 cm during picking.
Step two, withering: placing the picked fresh leaves in a cooling sieve of a withering room, wherein the laying thickness is 0.5cm, the tea leaves are required to be uniform in thickness and cannot be turned over when being laid, and the withering time is 20 hours; during withering, the temperature is set from low to high and the humidity is set from high to low. The temperature is 20-30 ℃, the humidity is 75-60%, and the circulation control is carried out.
Step three, drying: and (3) drying the withered tea leaves in a dryer at a temperature not exceeding 80 ℃ and keeping the moisture at 8%.
Step four, storage: and (3) putting the dried white tea into a storehouse provided with an air dehumidifier for sealed storage, wherein the temperature is 18 ℃, and the relative humidity of air is controlled below 60%.
Example 2
A processing method of white tea comprises the following steps:
step one, picking: the tea is picked from the initially-spread tea leaves which are free of diseases and insect pests and have complete and good appearance, and one bud and one leaf, and the length of the tea stalk is 0.3-0.5 cm during picking.
Step two, withering: placing the picked fresh leaves in a cooling sieve of a withering room, wherein the laying thickness is 3cm, the tea leaves are required to be uniform in thickness and cannot be turned over when being laid, and the withering time is 24 hours; during withering, the temperature is set from low to high and the humidity is set from high to low. The temperature is 20-30 ℃, the humidity is 75-60%, and the circulation control is carried out.
Step three, drying: and (3) drying the withered tea leaves in a dryer at a temperature not exceeding 80 ℃ and keeping the water content at 10%.
Step four, storage: and (3) putting the dried white tea into a storehouse provided with an air dehumidifier for sealed storage, wherein the temperature is 20 ℃, and the relative humidity of air is controlled below 60%.
Example 3
A processing method of white tea comprises the following steps:
step one, picking: the tea is picked from the initially-spread tea leaves which are free of diseases and insect pests and have complete and good appearance, and one bud and one leaf, and the length of the tea stalk is 0.3-0.5 cm during picking.
Step two, withering: placing the picked fresh leaves in a cooling sieve of a withering room, wherein the laying thickness is 2cm, the tea leaves are required to be uniform in thickness and cannot be turned over when being laid, and the withering time is 22 hours; during withering, the temperature is set from low to high and the humidity is set from high to low. The temperature is 20-30 ℃, the humidity is 75-60%, and the circulation control is carried out.
Step three, drying: and (3) drying the withered tea leaves in a dryer at a temperature not exceeding 80 ℃ and keeping the water content at 9%.
Step four, storage: and (3) putting the dried white tea into a storehouse provided with an air dehumidifier for sealed storage, wherein the temperature is 19 ℃, and the relative humidity of air is controlled below 60%.
The dryer in the third step of the embodiments 1-3 is shown as the attached figures 1 and 2: comprises a box body 8, a supporting frame 9 is welded at the outer bottom of the box body 8, six horizontal sliding grooves 6 are symmetrically arranged at two opposite sides of the inner wall of the box body 8 from top to bottom in a mirror image manner, six tea containing discs 4 for containing tea are arranged in the box body 8, the tea containing discs 4 are connected in the sliding grooves 6 in the box body 8 from top to bottom in a sliding manner, a plurality of air holes 5 are arranged on each tea containing disc 4, an air inlet and a heating mechanism are arranged at the bottom of the box body 8, the air inlet is arranged at the center of the bottom of the box body 8, a vertical air inlet pipe 11 is fixedly connected at the air inlet, the position of the air inlet pipe 11 is communicated with the air inlet, a filter plate is arranged at the bottom end of the air inlet pipe 11 and comprises a shell 13, the shell 13 is in threaded connection with the air inlet pipe 11, an avoiding port is arranged at the center of the shell 13, a filter layer 10 made of sponge is fixedly connected in the avoiding port, and the heating mechanism comprises an electric heating screen plate 12 made of electric heating wires, the electric heating screen plate 12 is rolled into a cylinder, the electric heating screen plate 12 is fixedly connected in the air inlet pipe 11, the electric heating screen plate 12 is coaxial with the air inlet pipe 11, the electric heating screen plate 12 is provided with a temperature adjusting device 7 (an electronic pressure regulator, model: DTY-4000W), and the temperature adjusting device 7 is connected with a power circuit of the electric heating screen plate 12 in series. The top of box 8 is equipped with the gas vent and constructs with hot gas in the box 8 from exhaust air pump 1 in the gas vent, and air pump 1 constructs including blast pipe 2, and blast pipe 2 is evenly laid at the interior top of box 8 and has been seted up a plurality of inlet ports 3 on blast pipe 2, and the end of giving vent to anger of blast pipe 2 passes outside box 8 is located box 8, and the end intercommunication of giving vent to anger of blast pipe 2 has air pump 1, and 8 outer fixedly connected with of box are used for controlling electric heat otter board 12 and start the switch who stops.
The specific implementation process is as follows:
before use, tea leaves to be dried are respectively put into six different tea containing trays 4, when the dryer is used, a power switch and an air pump 1 are started, when the air pump 1 operates, air in a box body 8 is pumped out through an exhaust pipe 2, negative pressure is formed in the box body 8, at the moment, because the external pressure is greater than the air pressure of the box body 8, the external air can enter the box body 8 through an air inlet pipe 11 under the action of atmospheric pressure, the air sequentially passes through a filter layer 10 and an electric heating screen plate 12 when entering the box body 8, dust in the air is filtered by the filter layer 10, then the air is heated by the cylindrical electric heating screen plate 12 to become hot air, then the tea leaves in the tea containing trays 4 are dried by the heat generated by the electric heating screen plate 12, moisture in the tea leaves is evaporated and floats on the inner top of the box body 8, at the moment, the air pump 1 sucks water vapor in the box body 8 into the exhaust pipe 2 from an air, then the humidity in the box body 8 is ensured not to be too high through the exhaust port of the air extractor 1.
When 1 mechanism of air extractor was with steam discharge box 8, because the atmospheric pressure of box 8 is less than external atmospheric pressure, consequently during external air entered into box 8 through the air inlet under the effect of atmospheric pressure, the moisture in box 8 was discharged in the circulation like this, ensure the degree of dryness in the stoving in-process box 8, effectively avoided stoving in-process tealeaves moisture content to reduce the back, can be again with steam absorption like in tealeaves, lead to the stoving effect poor, the condition that needs to dry by the fire again. Furthermore, when the drying temperature in the box body 8 needs to be adjusted, the temperature adjusting device 7 is used, the voltage of the power supply line is adjusted through the temperature adjusting device 7, and then the effect of adjusting the heat productivity of the electric heating screen plate 12 is achieved, when the voltage is reduced, the heat productivity of the electric heating screen plate 12 is reduced, and when the voltage is increased, the heat productivity of the electric heating screen plate 12 is increased. And controlling the temperature in the drying process. Consequently when carrying out the processing stoving of white tea through this scheme, drying efficiency is high, once dry can, need not carry out redrying, required temperature when can also adjusting to dry according to actual conditions simultaneously.
Claims (8)
1. The processing method of the white tea is characterized by comprising the following steps:
step one, picking: selecting primarily-spread tea leaves which are free of diseases and insect pests and have complete and good appearance, wherein one bud and one leaf are picked, and the length of a tea handle is 0.3-0.5 cm during picking;
step two, withering: placing the picked fresh leaves in a cooling sieve of a withering room, wherein the laying thickness is 0.5-3 cm, the tea leaves are required to be uniform in thickness and cannot be turned, and the withering time is 20-24 hours; in the withering process, the temperature is set from low to high, and the humidity is set from high to low; the temperature is 20-30 ℃, the humidity is 75-60%, and the circulation control is carried out;
step three, drying: drying the withered tea leaves in a dryer at a temperature not exceeding 80 ℃ and keeping the water content at 8-10%;
step four, storage: putting the dried white tea into a storehouse provided with an air dehumidifier for sealed storage, wherein the temperature is 18-22 ℃, and the relative humidity of air is controlled below 60%;
the drying machine in the third step comprises a box body, wherein a plurality of tea containing trays for containing tea are arranged in the box body, an air inlet and a heating mechanism are arranged at the bottom of the box body, a temperature adjusting device is arranged on the heating mechanism, and an air exhaust port and an air exhaust mechanism for exhausting hot air in the box body from the air exhaust port are arranged at the top of the box body.
2. The processing method of white tea as claimed in claim 1, wherein: a plurality of the tea containing trays are detachably connected in the box body from top to bottom, and each tea containing tray is provided with a plurality of air holes.
3. The processing method of white tea as claimed in claim 2, wherein: the air inlet sets up the center department of bottom half, air inlet department fixedly connected with vertical intake pipe, and intake pipe position and air inlet intercommunication, the bottom of intake pipe is equipped with the filter.
4. A processing method of white tea as claimed in claim 3, wherein: the filter includes the casing, casing and intake pipe threaded connection, casing center department is equipped with dodges the mouth, dodges the filter layer that intraoral fixedly connected with sponge was made.
5. The processing method of white tea as claimed in claim 4, wherein: the heating mechanism comprises an electric heating screen plate formed by heating wires, the electric heating screen plate is coiled into a cylinder shape, the electric heating screen plate is fixedly connected in the air inlet pipe, and the electric heating screen plate is coaxial with the air inlet pipe.
6. A processing method of white tea as claimed in claim 5, wherein: the temperature adjusting device is a device for adjusting the voltage, and is connected with a power supply circuit of the electric heating screen plate in series.
7. The processing method of white tea as claimed in claim 6, wherein: the air exhaust mechanism comprises an exhaust pipe, the exhaust pipe is evenly laid on the inner top of the box body, a plurality of air inlets are formed in the exhaust pipe, the air outlet end of the exhaust pipe penetrates through the box body and is located outside the box body, and the air outlet end of the exhaust pipe is communicated with an air extractor.
8. The processing method of white tea as claimed in claim 7, wherein: and a power switch for controlling the start and stop of the electric heating screen is fixedly connected outside the box body.
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|---|---|---|---|
| CN202110678628.7A CN113243432A (en) | 2021-06-18 | 2021-06-18 | Processing method of white tea |
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|---|---|---|---|
| CN202110678628.7A CN113243432A (en) | 2021-06-18 | 2021-06-18 | Processing method of white tea |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440597A (en) * | 2022-02-28 | 2022-05-06 | 湖南淳芝宝药业有限责任公司 | Herbal pieces-developments drying equipment |
| CN115406193A (en) * | 2022-09-06 | 2022-11-29 | 陕西颐天实业有限公司 | Preparation and softening method of flatstem milkvetch seeds |
| CN116898014A (en) * | 2023-09-12 | 2023-10-20 | 宁德市瑞元农业科技有限公司 | Tea production withering equipment |
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Application publication date: 20210813 |