CN116058513A

CN116058513A - Cold extraction instant coffee preparation process and coffee powder

Info

Publication number: CN116058513A
Application number: CN202310163120.2A
Authority: CN
Inventors: 刘汉惜
Original assignee: Hainan Nanguo Foodstuff Industry Co ltd
Current assignee: Hainan Nanguo Foodstuff Industry Co ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-05-05

Abstract

The invention relates to a cold extraction instant coffee preparation process, which comprises the following steps: selecting coffee beans with complete, full, insect-free and mildew-free particles; the coffee beans are driven to roll by the baking device to be uniformly baked, so that silver skin is fully peeled off and timely discharged away from high temperature; driving coffee beans to roll by using a baking device and spraying nitrogen for cooling; grinding the coffee beans into coffee powder by using a grinder; soaking and cold extracting the coffee powder; concentrating the extracted coffee, and freeze-drying the coffee concentrate to obtain freeze-dried coffee. The invention provides a cold extraction instant coffee preparation process, which can effectively clean silver skin in coffee beans in the baking process, greatly reduce the generation of acrylamide, reduce the smoke taste and barbecue taste of the coffee powder, and further improve the rehydration of the coffee powder so as to improve the dissolution rate of the coffee powder.

Description

Cold extraction instant coffee preparation process and coffee powder

Technical Field

The invention belongs to the technical field of coffee powder preparation, and particularly relates to a cold extraction instant coffee preparation process and coffee powder.

Background

Coffee (English) is a beverage made by baking and grinding coffee beans. As one of the three major beverages in the world, it is popular with cocoa and tea as the main beverage in the world. For convenience of people to brew and drink, coffee is often used for making coffee powder packages for sale. The traditional coffee powder manufacturing process comprises the following steps: selecting coffee beans, roasted coffee beans, and ground coffee beans. The final coffee powder can be directly used for preparing sugar or infusing milk.

Currently, a coffee roasting machine is disclosed in the prior art, such as CN201088125, which comprises a drum, wherein after coffee is poured into the drum, the drum is heated by a heater and driven to rotate for roasting. However, the surface of the coffee powder beans is coated with silver skin, the silver skin falls off partially in the baking process, and the fallen silver skin is seriously burnt and carbonized after being baked, so that the generation of acrylamide (cancer making substance) is further aggravated, the silver skin remained on the coffee beans is also easily burnt and carbonized, and serious smoke taste and barbecue taste can be generated when the silver skin is directly ground, the taste of the coffee powder is seriously influenced, and the quality of coffee is greatly reduced. The conventional process is therefore not suitable for making high-quality coffee. Therefore, the cold extraction instant coffee preparation process is provided, the coffee powder prepared by the process can effectively clean silver skin in coffee beans in the baking process, so that the generation of acrylamide is greatly reduced, the smoke taste and barbecue taste of the coffee powder can be reduced, in addition, the rehydration of the coffee powder can be improved, and the dissolution rate of the coffee powder is further improved.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the cold extraction instant coffee preparation process has the advantages that the silver skin in the coffee beans can be effectively cleaned in the baking process, the generation of acrylamide is greatly reduced, the smoke taste and the barbecue taste of the coffee powder can be reduced, in addition, the rehydration of the coffee powder can be improved, and the dissolution rate of the coffee powder is further improved.

The invention adopts the technical scheme that:

a cold extraction instant coffee preparation process comprises the following steps,

selecting: selecting coffee beans with complete, full, insect-free and mildew-free particles;

and (3) baking: the coffee beans are driven to roll by the baking device to be uniformly baked, so that silver skin is fully peeled off and timely discharged away from high temperature;

and (3) cooling: driving coffee beans to roll by using a baking device and spraying nitrogen for cooling;

and (3) grinding: grinding the coffee beans into coffee powder by using a grinder;

extraction: soaking and cold extracting with cold water at 0-10 deg.c in the weight ratio of coffee powder to water of 1 to 10-15 for 8-12 hr;

and (3) concentration: concentrating the extracted coffee to 50-60% concentration coffee liquor;

and (3) drying: freeze-drying the coffee concentrate to obtain the freeze-dried coffee.

Further, the baking temperature of the baking is 160-230 ℃ and the baking time is 10-20 min.

Further, nitrogen is sprayed for 3 to 5 minutes.

Further, the baking device comprises a baking machine, a liquid nitrogen tank, a steam generator and a controller;

the baking machine comprises a baking box and a slag discharging mechanism, wherein a temperature sensor is arranged in the baking box, a flow dividing structure is arranged at the top of the baking box, a rotating sleeve and a rotating disc are respectively arranged at two sides of the upper part of the baking box in a rotating mode, a plurality of heating pipes are connected between the rotating sleeve and the rotating disc at intervals, a sealing cover is detachably arranged on the rotating sleeve, annular grooves I are respectively arranged in the rotating sleeve and the rotating disc, a plurality of communication holes I and communication holes II are respectively arranged on two side walls of the annular grooves I, annular grooves II are respectively arranged on the peripheries of the rotating sleeve and the rotating disc, the annular grooves I are respectively communicated with the heating pipes and the annular grooves II through the communication holes I and the communication holes II, the annular grooves II are respectively connected with a steam inlet pipe and a steam outlet pipe, and the slag discharging mechanism comprises a discharge hole respectively arranged at two sides of the bottom of the baking box, a waste box arranged at two sides of the bottom of the baking box, and a motor arranged on the waste box; two bidirectional screw rods are jointly arranged in the discharge holes in a penetrating mode, two ends of each bidirectional screw rod are respectively arranged on the side walls of the two waste boxes in a penetrating mode in a rotating mode, one end of each bidirectional screw rod is connected with the motor in a driving mode, the other end of each bidirectional screw rod is connected with the rotary disc through a transmission mechanism, scraping plates are meshed on the bidirectional screw rods, and the lower ends of the scraping plates are in sliding abutting connection with the bottoms of the baking boxes;

the liquid nitrogen tank is provided with an electromagnetic valve which is connected with the shunt mechanism through a gas pipe;

the steam generator is connected with a steam pump, and the steam pump is connected with the steam inlet pipe;

the controller is respectively and electrically connected with the temperature sensor, the electromagnetic valve, the steam pump, the motor and the steam generator.

Further, the flow dividing structure comprises a communicating cavity arranged in the top of the baking box, the communicating cavity is connected with the gas pipe, and a plurality of flow dividing holes are formed in the bottom of the communicating cavity.

Further, the transmission mechanism comprises a rotating shaft arranged on the rotating disc and a chain wheel arranged on the end part of the bidirectional screw rod, and the rotating shaft is also provided with the chain wheel, and the two chain wheels are connected through a chain.

Further, water is arranged in the waste box, and a filter screen is arranged at the top of the waste box.

Furthermore, the steam inlet pipe and the steam outlet pipe are respectively provided with a one-way valve.

Further, the cover is mounted on the swivel by a plurality of bolts.

A coffee grounds, characterized in that it is prepared by a new coconut powder preparation process according to any one of

claims

1, 2, 3, 5, 6, 7, 8 and 9.

Compared with the prior art, the invention has the beneficial effects that:

the coffee beans are heated in a turnover manner by utilizing the baking device in the baking process, so that the coffee beans are uniformly baked, the local excessive baking of the coffee beans is avoided, the baking effect is good, the impact between the heating pipe and the coffee beans and between the coffee beans and the coffee beans is aggravated in the rolling process, the silver skin rapidly falls down to the bottom of the baking box, and is discharged out of the baking box in time through the slag discharging mechanism, so that a large amount of acrylamide (cancer-making substances) is avoided, the silver skin is prevented from being excessively baked, the drinking taste of the coffee is also prevented from being influenced by the fact that the silver skin is mixed in the coffee powder, the smoke taste and the baking taste of the coffee are reduced, and the quality of the coffee is improved; after the coffee is baked, nitrogen blowing is adopted to cool quickly, so that high-temperature pyrolysis is effectively stopped and the flavor is locked; meanwhile, the silver skin remained on the coffee beans can be dropped to the bottom of the baking box under the impact of heat expansion and cold contraction and air flow, so that the cleaning effect on the silver skin is further improved, carbides on the coffee beans can be effectively cleaned, and the quality of coffee is further improved; the peculiar smell (smoky flavor and burnt flavor) of the coffee can be further reduced through extraction treatment, so that the coffee has a light taste; finally, through freeze drying treatment, the rehydration of the coffee powder is greatly improved, and the dissolution rate of the coffee powder is further improved.

Drawings

FIG. 1 is a schematic view of the overall structure of a baking apparatus;

fig. 2 is a schematic view of an internal structure of the roaster;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is an enlarged view at B in FIG. 2;

FIG. 5 is a cross-sectional view taken at C-C in FIG. 4;

in the figure: 1. a liquid nitrogen tank; 2. a motor; 3. a waste bin; 301. a filter screen; 4. a baking box; 5. a controller; 6. a chain; 7. a steam generator; 8. a steam pump; 9. a steam inlet pipe; 10. a one-way valve; 11. a gas pipe; 12. an electromagnetic valve; 13. a discharge port; 14. a two-way screw rod; 15. a scraper; 16. a sprocket; 17. a communication chamber; 18. an exhaust pipe; 19. an annular groove I; 20. a first communicating hole; 21. annular groove II; 22. a second communicating hole; 23. heating pipes; 24. a bolt; 25. a cover; 26. a rotating sleeve; 27. a rotating shaft; 28. a steam exhaust hole; 29. a temperature sensor; 30. a turntable.

Detailed Description

For a better understanding of the technical content of the present invention, specific examples are provided below and described with reference to the accompanying drawings.

See fig. 1-5;

comparative example:

and (3) baking: baking by using a baking machine in the prior art, wherein the baking temperature is 160 ℃, and the baking time is 10min;

embodiment one:

and (3) cooling: driving coffee beans to roll by using a baking device, spraying nitrogen and cooling for 3-5 min;

extraction: soaking and cold extracting with cold water at 0deg.C, wherein the mass ratio of coffee powder to water is 1:10, and extracting time is 8 hr;

and (3) concentration: concentrating the extracted coffee to a 50% strength coffee liquor;

Specifically, the baking temperature of the baking is 160 ℃, and the baking time is 10min.

Specifically, the nitrogen spraying time is 3min.

Specifically, the baking device comprises a baking machine, a liquid nitrogen tank 1, a steam generator 7 and a controller 5;

the roasting machine comprises a roasting box 4 and a slag discharging mechanism, wherein a temperature sensor 29 is arranged at the upper part in the roasting box 4, a flow dividing structure is arranged at the top of the roasting box 4, a rotating sleeve 26 and a rotating disc 30 are respectively arranged at the left side and the right side of the upper part of the roasting box 4 in a rotating way, a plurality of heating pipes 23 are connected between the rotating sleeve 26 and the rotating disc 30 at equal intervals, so that the plurality of heating pipes 23, the rotating disc 30, a rotating shaft 27 and a sealing cover 25 form a cage-shaped structure, the distance between the heating pipes 23 is 3-5mm, the rotating sleeve 26 is detachably provided with the sealing cover 25, one end of the sealing cover 25 is in a closed tubular structure, the right side of the sealing cover 25 extends to the left end of the heating pipe 23 during sealing so as to prevent coffee beans from entering the rotating sleeve 26 and being burnt, annular grooves I19 are respectively arranged in the rotating sleeve 26 and the rotating sleeve 26, a plurality of communication holes I20 and II 22 are respectively arranged on two side walls of the two annular grooves I19, the communication holes I20 and II 22 are respectively arranged on two side walls of the rotating sleeve, the communication holes II 20 and the communication holes II 22 are respectively arranged at equal intervals in a circular shape, two side walls of the upper part of the roasting box 4 are respectively, two annular grooves I21 and II 21 are respectively arranged on the two side walls of the rotating sleeve 23 and II annular grooves 3 and the two annular grooves 3 and the bottom of the waste steam discharging box 4 are respectively arranged at the two sides and the two sides of the annular grooves 3 and the annular grooves 3 are respectively arranged at the two sides and the bottom of the annular grooves 3 and the two sides of the waste box 4 are respectively; two discharge ports 13 are internally and jointly penetrated with a two-way screw rod 14, two ends of the two-way screw rod 14 are respectively and rotatably penetrated on the side walls of two waste boxes 3, one end of the two-way screw rod 14 is connected with a motor 2 in a driving way, the other end of the two-way screw rod is connected with a rotary table 30 through a transmission mechanism, scraping plates 15 are engaged on the two-way screw rod 14 in a threaded manner, and the lower ends of the scraping plates 15 are in sliding abutting connection with the bottom of a baking box 4; the liquid nitrogen tank 1 is internally stored with liquid nitrogen, the liquid nitrogen tank 1 is provided with an electromagnetic valve 12, and the electromagnetic valve 12 is connected with a shunt mechanism through a gas pipe 11; the steam generator 7 is connected with a steam pump 8, and the steam pump 8 is connected with a steam inlet pipe 9; the controller 5 is respectively and electrically connected with the temperature sensor 29, the electromagnetic valve 12, the steam pump 8, the motor 2 and the steam generator 7, the controller 5 adopts the PLC controller 5, and the steam generator 7 adopts Henan Jingjun mechanical equipment Co., ltd, model JQJ-72kw.

During roasting, coffee beans are put into a plurality of heating pipes 23, a sealing cover 25 is arranged in a rotating sleeve 26, a controller 5 controls a steam generator 7 and a steam pump 8 to start, the steam pump 8 conveys steam generated by the steam generator 7 into an annular groove II 21 in the right side wall of a roasting box 4 through an air inlet pipe, the steam sequentially enters the heating pipes 23 through a right communication hole II 22, a right annular groove I19 and a right communication hole I20, the plurality of heating pipes 23 are heated, the steam then enters the left annular groove I19 from the left communication hole I20 of the heating pipe 23, and the steam then sequentially enters a steam exhaust pipe 18 from the left communication hole II 22 and the left annular groove II 21 and is discharged out of the air; in the process, the temperature sensor 29 is used for detecting the temperature in the baking box 4 and feeding back to the controller 5, the controller 5 controls the steam generator 7 and the steam pump 8 to intermittently work so as to control the baking temperature and the baking time, and the PLC 5, the temperature sensor 29 and the steam generator 7 are used for controlling the temperature heating so as to not describe the prior art; in the baking process, the controller 5 controls the motor 2 to work, the motor 2 drives the bidirectional screw rod 14 to rotate on the side wall of the waste box 3, the bidirectional screw rod 14 drives the scraping plate 15 to slide back and forth on the bottom of the baking box 4, when the scraping plate 15 slides into the discharge hole 13, and the outer side surface of the scraping plate 15 is aligned with the outer side surface of the discharge hole 13, the bidirectional screw rod 14 drives the scraping plate 15 to move reversely so as to scrape silver skin out of the baking box 4 in time and fall into the waste box 3 on two sides, the falling silver skin is prevented from being burnt in the baking box 4 and fumigating coffee beans to aggravate peculiar smell, the bidirectional screw rod 14 passband transmission mechanism drives the turntable 30 to rotate on the right side wall of the baking box 4, the turntable 30 drives the rotating sleeve 26 to rotate on the left side wall of the baking box 4 through the heating pipe 23, so that the coffee beans are driven to be overturned and heated by the heating pipe 23, the coffee beans are baked uniformly, the local excessive baking of the coffee beans is prevented, the falling silver skin is prevented from falling down on the bottom of the baking box 4 rapidly in the rolling process. The baking device is utilized to clean a large amount of silver skins in the baking process, so that the influence of the mixing of a large amount of silver skins in coffee powder on the drinking taste of coffee is avoided, the peculiar smell (smoky flavor and burnt flavor) of the coffee is reduced, and the quality of the coffee is improved; when cooling is needed, the electromagnetic valve 12 is controlled to be opened by the controller 5, so that liquid nitrogen in the liquid nitrogen tank 1 is conveyed to the diversion mechanism through the gas pipe 11, and the coffee beans are sprayed and rapidly cooled;

specifically, the split-flow structure comprises a communication cavity 17 arranged in the top of the roasting box 4, the communication cavity 17 is connected to the gas pipe 11, a plurality of split-flow holes are formed in the bottom of the communication cavity 17, and liquid nitrogen enters the communication cavity 17 and is sprayed to coffee beans through the plurality of split-flow holes, so that the coffee beans are uniformly sprayed.

Specifically, the transmission mechanism comprises a rotating shaft 27 arranged on the turntable 30 and a chain wheel 16 arranged on the end part of the bidirectional screw rod 14, the chain wheel 16 is also arranged on the rotating shaft 27, and the two chain wheels 16 are connected through a chain 6. The bidirectional screw rod 14 drives the sprocket 16 on the bidirectional screw rod to rotate, the sprocket 16 drives the other sprocket 16 to rotate through the chain 6, and the other sprocket 16 drives the turntable 30 to rotate through the rotating shaft 27.

Specifically, be equipped with water in the waste bin 3, the water level is less than the bottom in the baking case 4 for the silver skin of high temperature falls into water and is collected and the cooling, and waste bin 3 top is equipped with filter screen 301, avoids blowing nitrogen cooling time, and the silver skin is blown out waste bin 3 and brings inconvenience for the clearance.

Specifically, the check valves 10 are arranged on the steam inlet pipe 9 and the steam outlet pipe 18, the check valve 10 on the steam inlet pipe 9 is used for preventing steam in the baking machine from flowing back into the steam pump 8, and the check valve 10 on the steam outlet pipe 18 can effectively prevent external air from flowing into the baking machine through the steam outlet pipe 18, so that the heat preservation effect is achieved.

Specifically, the cover 25 is mounted on the rotating sleeve 26 by a plurality of bolts 24, and the bolts 24 are dovetail bolts, so that the cover 25 can be conveniently assembled and disassembled.

Embodiment two:

the baking apparatus employed in this embodiment is identical to that of the embodiment;

and (3) cooling: driving coffee beans to roll by using a baking device, spraying nitrogen and cooling for 5min;

extraction: soaking and cold extracting with cold water at 10deg.C, wherein the mass ratio of coffee powder to water is 1:15, and extracting time is 12h;

and (3) concentration: concentrating the extracted coffee to obtain a coffee solution with the concentration of 60%;

Further, the baking temperature of the baking is 230 ℃, and the baking time is 20min.

Further, nitrogen spraying time is 5min.

The coffee beans produced by the first and second examples were evaluated and tried to obtain the following results:

the foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. A cold extraction instant coffee preparation process is characterized by comprising the following steps,

2. The novel process for preparing coconut powder as recited in claim 1, wherein the baking temperature is 160-230 ℃ and the baking time is 10-20 min.

3. The novel process for preparing coconut powder as claimed in claim 1, wherein the nitrogen injection is carried out for 3-5 min.

4. A new coconut powder manufacturing process as recited in any one of claims 1-3, wherein the baking device includes a baking machine, a liquid nitrogen tank, a steam generator and a controller;

5. The new coconut powder preparing process of claim 4, wherein the split-flow structure comprises a communicating cavity arranged in the top of the baking box, the communicating cavity is connected with the air pipe, and a plurality of split-flow holes are arranged at the bottom of the communicating cavity.

6. The new coconut powder preparing process of claim 4, wherein the driving mechanism comprises a rotating shaft arranged on the turntable and a chain wheel arranged on the end part of the bidirectional screw rod, the rotating shaft is also provided with the chain wheel, and the two chain wheels are connected through a chain.

7. The new coconut powder preparing process of claim 4, wherein the waste bin is provided with water and a filter screen at the top.

8. The novel coconut powder preparation process of claim 4, wherein the steam inlet pipe and the steam outlet pipe are respectively provided with a one-way valve.

9. The novel coconut powder manufacturing process of claim 4, wherein the cover is mounted on the rotating sleeve by a plurality of bolts.

10. A coffee grounds, characterized in that it is prepared by a new coconut powder preparation process according to any one of claims 1, 2, 3, 5, 6, 7, 8 and 9.