WO2020057082A1

WO2020057082A1 - Device for preparing dietary fiber powder, and method for preparing dietary fiber powder

Info

Publication number: WO2020057082A1
Application number: PCT/CN2019/079459
Authority: WO
Inventors: 张楠
Original assignee: 上海同化新材料科技有限公司
Priority date: 2018-09-20
Filing date: 2019-03-25
Publication date: 2020-03-26

Abstract

Disclosed is a device for preparing a dietary fiber powder, the device comprising a screw rod cavity, a screw rod, a speed reducer, a feed port, a discharge port, a bracket and a base, wherein the feed port is connected to and in communication with a discharge opening of a vertically arranged screw conveyor; a first opening is provided in the side of an upper portion of the vertically arranged screw conveyor away from the discharge port, and the first opening is connected to and in communication with a discharge opening of a horizontally arranged screw conveyor; and a second opening is provided in an upper portion of the horizontally arranged screw conveyor, and an upper portion of the second opening is provided with a loading hopper in communication with same. Further disclosed are a method for preparing a sugarcane or xylary dietary fiber powder on the basis of the device for preparing a dietary fiber powder, and a dietary fiber powder.

Description

Device for preparing dietary fiber powder and method for preparing dietary fiber powder

Technical field

The invention relates to the field of dietary cellulose preparation. More specifically, the present invention relates to a device for preparing dietary fiber powder and a method for preparing dietary fiber powder.

Background technique

Dietary fiber is a general term for polysaccharide carbohydrates and lignin that are not digested and absorbed by the body. It has various functions such as enhancing satiety, preventing constipation, regulating blood sugar, blood lipids, and preventing colon cancer. Therefore, it is classified as human "The seventh largest nutrient".

At present, the extraction and modification methods of dietary fiber mainly include biological method, chemical method, physical method, biological-physical combination method, and chemical-physical combination method. Among them, the chemical-physical combination method is mainly carried out on cellulose raw materials. After chemical treatment, screw extrusion equipment is used for extrusion modification. The obtained dietary fiber powder has a rough texture, poor water absorption and oil absorption, and the existing screw extrusion equipment for preparing dietary fiber powder. Mostly, twin screw extruders designed for raw materials in the food and feed field are used. Due to the low density and poor fluidity of cellulose raw materials compared with food and feed raw materials, the existing twin screw extruders "Bridge phenomenon" is easy to occur in the feeding stage in front of the cavity, that is, there is material in the upper part of the feeding container and no material in the lower part, which causes a hollow phenomenon during the movement of the material.

Summary of the Invention

It is an object of the present invention to provide a device for preparing dietary fiber powder, which can overcome the "bridge phenomenon" that occurs when materials are fed.

Still another object of the present invention is to provide a method for preparing sugarcane dietary fiber powder based on a device for preparing dietary fiber powder, which uses bagasse as the raw material and performs secondary extrusion at a certain temperature and pressure. The extraction treatment makes the texture of the obtained sugarcane dietary fiber powder soft, and significantly improves water absorption and oil absorption performance.

Another object of the present invention is to provide a method for preparing wooden dietary fiber powder based on a device for preparing dietary fiber powder, which uses softwood as a raw material, and performs secondary extrusion treatment at a certain temperature and pressure to obtain The texture of the wooden dietary fiber powder is soft, and the water and oil absorption performance is significantly improved.

Another object of the present invention is to provide a dietary fiber powder.

In order to achieve the purpose and other advantages according to the present invention, a device for preparing dietary fiber powder is provided, which includes a screw cavity, a screw, a reducer, a feeding port, a discharging port, a bracket, and a base. The mouth is connected and communicated with the discharge opening of a vertically arranged screw conveyor, and the upper portion of the vertically arranged screw conveyor is provided with a first opening on a side remote from the discharge opening, and the first opening is horizontally arranged with the The discharge port of the screw conveyor is connected and communicated, and a second opening is provided at an upper portion of the horizontally arranged screw conveyor, and an upper portion of the second opening is provided with a feeding hopper connected thereto.

Preferably, in the device for preparing dietary fiber powder, the feeding hopper is provided with 1-4 agitators arranged at intervals in the vertical direction.

Preferably, in the device for preparing dietary fiber powder, the screw cavity is an open structure at both ends, which is arranged horizontally, and the feeding port is provided at an upper part of one end of the screw cavity, and the screw The other end of the cavity is a discharge port, and two screws are arranged in parallel in the screw cavity. One end of any screw near the feed port is driven by a speed reducer, and the screw runs from the feed port to the screw port. The discharge port is divided into a feeding section, a mixed shearing section, and an extrusion discharging section in order. The screw diameter of the feeding section is 30mm to 285mm, the pitch is 40mm to 320mm, the aspect ratio is 5 to 55, and the lead is 60mm to 570mm, the screw diameter of the mixed shearing section is 30mm ~ 285mm, the pitch is 10mm ~ 320mm, the aspect ratio is 4 ~ 55, the lead is 60mm ~ 570mm, and the screw diameter of the extrusion discharge section is 30mm ~ 285mm The pitch is 10mm-320mm, the aspect ratio is 1-55, and the lead is 60mm-570mm. The pitch of the screw decreases gradually from the feeding section to the extrusion discharge section.

Preferably, the device for preparing dietary fiber powder further includes a plurality of electric induction heating devices, which are respectively spaced apart from the outside of the screw cavity for heating the screw cavity; A water cooling device includes a water-cooled heat exchanger and a plurality of heat exchange tubes connected to the water cooling heat exchanger, the plurality of heat exchange tubes are respectively disposed at intervals outside the screw cavity for cooling the screw cavity; and Temperature sensors, which are spaced apart from the outside of the screw cavity, and above the plurality of electric induction heating devices and at the discharge port are used to monitor the temperature of the screw cavity.

Preferably, the device for preparing dietary fiber powder further includes a pressure regulating plate, which is disposed outside the discharge opening and is disposed in parallel with the pressure regulating plate, and the pressure regulating plate is arranged along the outlet. The direction of the discharge port can be slid in both directions for controlling the pressure of the discharge port; and an outer cover is sleeved on the outside of the discharge port and the pressure regulating plate for controlling the discharge direction.

Preferably, in the device for preparing dietary fiber powder, an end of the screw near the feeding port is connected to a shaft output end of the reducer through a coupling of a rectangular spline, and locked with a nut. The rotation direction of the nut is the same as the rotation direction of the screw, and the input end of the reducer is driven by a main motor through a belt.

Preferably, in the device for preparing dietary fiber powder, one end of the screw cavity is detachably connected to the output end of the reducer through a coupling.

Preferably, in the device for preparing dietary fiber powder, the screw located in the mixed shearing section is divided into three different section sections, and the pitch of each section section ranges from the feeding section to the extrusion discharge. Decreasing segment gradient.

Preferably, the device for preparing dietary fiber powder is provided with a spiral groove on the threads of the mixed shearing section and the extrusion discharge section.

Preferably, in the device for preparing dietary fiber powder, the two screws are of a multi-segment structure, and each segment is connected by a rectangular spline.

Preferably, in the device for preparing dietary fiber powder, the screw cavity has a multi-segment structure, and each segment is connected by a flange and a bolt.

A method for preparing sugarcane dietary fiber powder based on a device for preparing dietary fiber powder, comprising:

Step 1: removing impurities from the raw bagasse to obtain primary bagasse with a pulp content of at least 50%;

Step 2: Add the preliminary bagasse obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed-shearing section to 80-120 ° C, and squeeze the row. The working temperature of the material section is 120-180 ° C. The working temperature increases gradually from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤20min. The pressure at the outlet is controlled to 2-10MPa to obtain a single extrusion;

Step 3: The one-time extruded material obtained in step 2 is sequentially subjected to alkali cooking, washing, bleaching, and dehydration to obtain a water-containing material having a water content of 20-50%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed shearing section to 80-120 ° C, and squeeze the row The working temperature of the material section is 120-150 ° C. The working temperature increases gradually from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤10min. The pressure at the outlet is controlled to be 0.5-5MPa to obtain a secondary extrusion material;

Step 5: drying and pulverizing the secondary extruded material obtained in step 4 to obtain the obtained material.

Preferably, in the method for preparing sugarcane dietary fiber powder based on the apparatus for preparing dietary fiber powder, the bleaching is a chlorine-free bleaching.

A method for preparing wood dietary fiber powder based on a device for preparing dietary fiber powder, comprising:

Step 1: Crush the softwood to 30 meshes, and obtain the broken wood for future use;

Step 2: Add the crushed wood obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed shearing section to 80-150 ° C, and squeeze the discharge. The working temperature of the section is 150-250 ° C. The working temperature is gradually increased from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤20min. The pressure at the discharge port is controlled to 2-10MPa to obtain a single extrusion;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed shearing section to 80-120 ° C, and squeeze the row The working temperature of the material section is 120-180 ° C. The working temperature increases gradually from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤10min. The pressure at the outlet is controlled to be 0.5-5MPa to obtain a secondary extrusion material;

Dietary fiber powder, which is prepared by the method.

Preferably, the dietary fiber powder further comprises compounding the dietary fiber powder with soluble dietary fiber, wherein the content of the soluble dietary fiber is 1-30%, and the soluble dietary fiber includes the following At least one component: fructooligosaccharides, galactooligosaccharides, xylooligosaccharides, isomalttooligosaccharides, soy oligosaccharides, chitosan oligosaccharides, and inulin.

The present invention includes at least the following beneficial effects:

First, in the feeding stage, the present invention is provided with a horizontally arranged screw conveyor and a vertically arranged screw conveyor, which helps to overcome the shortcomings of poor fluidity of the cellulose material, improves the material feeding speed, and prevents "bypassing" during feeding. Phenomenon "; the screw is divided into different pitch designs, the large pitch section is conducive to increasing the feed speed of the material, the small pitch section makes the material broken and the extrusion reaction is more adequate; multiple electrical induction heating devices are installed outside the screw cavity, The water cooling device and multiple temperature sensors can control the temperature in the screw cavity in sections, so that the working temperature of the feeding section of the screw is maintained at 50-170 ° C, and the working temperature of the mixing and shearing section is maintained at 80-170 ° C. The working temperature of the discharge section is maintained at 80-250 ° C; a pressure regulating plate is set outside the discharge port, which can apply a certain pressure to the material at the discharge port, so that the material can fully pyrolyze again, and at the same time, The material will not be discharged too quickly, making it easy to collect the material.

Second, during the preparation process of the dietary fiber powder of the present invention, there are two extrusion treatments. The first extrusion treatment can destroy the viscosity between lignin, cellulose and hemicellulose in the fiber raw material, and improve the subsequent alkaline cooking and delignification. Efficiency, the second extrusion treatment helps to improve the water and oil absorption properties of the fiber, and makes the obtained dietary fiber powder soft and can be used as an additive in the food and feed industry.

Other advantages, objectives, and features of the present invention will be partially realized through the following description, and part of them will be understood by those skilled in the art through research and practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of the overall structure of the apparatus for preparing dietary fiber powder according to an embodiment of the present invention;

2 is a schematic structural diagram of the two screws according to an embodiment of the present invention;

FIG. 3 is a partial cross-sectional structural diagram of the two screws A-A according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, so that those skilled in the art can implement the present invention with reference to the description text.

It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified. In the description of the present invention, The terms "horizontal", "portrait", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", The directions or positional relations indicated by “inside” and “outside” are based on the positional or positional relations shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have The specific orientation is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

As shown in FIGS. 1 and 2, the present invention provides a device for preparing dietary fiber powder, which includes a screw cavity 10, a screw 18, a reducer 3, a feeding port, a discharging port, a bracket 15 and a base 17, The feeding port is connected and communicated with a discharge port of a vertically arranged screw conveyor 9, and a first opening is provided on a side of the upper portion of the vertically arranged screw conveyor 9 away from the discharging port. An opening is connected and communicated with the discharge port of the horizontally arranged screw conveyor 6, and an upper portion of the horizontally arranged screw conveyor 6 is provided with a second opening, and an upper portion of the second opening is provided with a feeding hopper 7 communicating therewith. .

In the above technical solution, the feeding port and the discharging port are disposed on the screw cavity 10; the screw 18 is disposed in the screw cavity 10, and is driven by the reducer 3; the bracket 15 is provided on the base 17 to support the screw cavity 10; the vertically arranged screw conveyor 9 is driven by a vertical conveying motor 8, and the horizontally arranged screw conveyor 6 is driven by a horizontal conveying motor 5. ; A horizontally disposed screw conveyor 6 is provided below the feeding hopper 7, a horizontally disposed screw conveyor 9 is provided at a discharge port of the horizontally disposed screw conveyor 6, and the The discharge port of the vertically arranged screw conveyor 9 communicates with the feeding port, so that after the material is added to the hopper 7, the horizontally arranged screw conveyor 6 and the vertically arranged screw conveyor 9 Under the action, the feeding hopper 7, the horizontally arranged screw conveyor 6, the vertically arranged screw conveyor 9, and the feeding port enter the inside of the screw cavity 10 in order to achieve forced feeding. , Overcome the low density of cellulose raw materials, The problem of poor mobility, improve the cutting speed of the material, to prevent a "bridge phenomenon" the feed.

In a preferred solution, in the device for preparing dietary fiber powder, the feeding hopper 7 is provided with 1-4 agitators 19 which are arranged at intervals in the vertical direction.

In the above technical solution, the setting method of the agitator 19 may be a horizontal setting or an inclined setting, and the horizontal setting is more preferable to facilitate installation. One to four agitators are set according to the height of the hopper 7 19, further avoiding the “bridging phenomenon” when the materials enter the horizontally arranged screw conveyor 6.

In a preferred solution, in the device for preparing dietary fiber powder, the screw cavity 10 is an open structure at both ends, which is horizontally disposed, and the feeding port is disposed at one end of the screw cavity 10 In the upper part, the other end of the screw cavity 10 is a discharge port. Two screws 18 are arranged in parallel in the screw cavity 10, and one end of any screw 18 near the feed port is driven to rotate by a reducer 3. The screw 18 is divided into a feeding section 1801, a mixing and shearing section 1901, and an extrusion discharging section 1803 in order from the feeding port to the discharging port. The diameter of the screw 18 of the feeding section 1801 is 30 mm to 285 mm, and the pitch is 40mm ～ 320mm, aspect ratio is 5 ～ 55, lead is 60mm ～ 570mm, the diameter of screw 18 of the mixed shearing section 1901 is 30mm ～ 285mm, pitch is 10mm ～ 320mm, aspect ratio is 4 ～ 55, lead The diameter of the screw 18 of the extrusion discharge section 1803 is 30 mm to 285 mm, the pitch of the screw 18 is 10 mm to 320 mm, the aspect ratio is 1 to 55, the lead is 60 mm to 570 mm, and the pitch of the screw 18 is The gradient decreases from the feeding section 1801 to the extrusion discharging section 1803.

In the above technical solution, the screw 18 is divided into a feeding section 1801, a mixed shearing section 1901, and an extrusion discharge section 1803 in order from the feeding port to the discharging port, and the pitch of the screw 18 is determined by The gradient from the feeding section 1801 to the extrusion discharge section 1803 is gradually decreasing. The large pitch of the feeding section 1801 is beneficial to increase the feeding speed of the material, so that the material quickly enters the screw cavity 10, and the pitch of the mixed shearing section 1901. It is smaller than the feeding section. The materials are fully mixed and sheared here, so that the particle size and volume of the materials are reduced, the materials are more compact, the pitch of the extrusion discharge section 1803 is the smallest, and the materials are fully damaged, squeezed, Kneading makes the particle size of the material smaller and softer. As the particle size of the material changes during the conveying process, the pitch of the different gradients makes the particle size of the material reaching the discharge port finer and more uniform, making the subsequent crushing process easier.

In a preferred solution, the device for preparing dietary fiber powder further includes a plurality of electric induction heating devices 12 which are respectively spaced apart from the outside of the screw cavity 10 for feeding the screw. The cavity 10 is heated; the water-passing cooling device includes a water-cooled heat exchanger 16 and a plurality of heat exchange tubes 20 connected to the water-cooled heat exchanger 16, and the plurality of heat exchange tubes 20 are sleeved on the outside of the screw cavity 10 at intervals, For cooling the screw cavity 10; a plurality of temperature sensors 11 spaced apart from the outside of the screw cavity 10, above the plurality of electric induction heating devices 12 and at the discharge port, For monitoring the temperature of the screw cavity 10.

In the above technical solution, a plurality of electric induction heating devices 12, a water cooling device, and a plurality of temperature sensors 11 are provided outside the screw cavity 10, and the temperature in the screw cavity 10 can be controlled in sections so that The working temperature of the feeding section 1801 of the screw 18 is maintained at 50-170 ° C, the working temperature of the mixing-shearing section 1901 is maintained at 80-170 ° C, the working temperature of the extrusion discharge section 1803 is maintained at 80-250 ° C, and the working The temperature rises gradually from the feeding section 1801 to the extrusion discharging section 1803. During the material conveying process, the moisture contained in the material is continuously converted into water vapor, which causes the pressure in the screw cavity 10 to increase. When the pressure in the screw cavity 10 reaches a certain range, β cellulose and γ cellulose in the cellulose raw material are rapidly decomposed, and the content of α cellulose in the dietary fiber powder is increased, which significantly improves the water absorption and oil absorption performance of the dietary fiber powder. .

In a preferred solution, the apparatus for preparing dietary fiber powder further includes a pressure regulating plate 13 which is disposed on the outside of the discharge port and is disposed opposite to and parallel to the pressure regulating plate 13. The pressure regulating plate 13 is provided. In order to be able to slide in both directions in the direction of the discharge port, it is used to control the pressure of the discharge port; and the cover 14 is sleeved on the outside of the discharge port and the pressure regulating plate 13 to control the discharge direction.

In the above technical solution, a pressure adjustment plate 13 is provided outside the discharge port, and the pressure in the screw cavity 10 in the material is changed by adjusting the distance between the pressure adjustment plate 13 and the discharge port. Controlling the pressure at the discharge port to 0.5-10 MPa, so that the material fully undergoes a pyrolysis reaction again, and further increases the content of alpha cellulose in the dietary fiber powder; at the same time, the pressure regulating plate 13 is used to control the discharge, and Compared with the traditional discharge mold, it is more suitable for cellulose raw materials, which can effectively prevent the material from forming a "bridge phenomenon" at the discharge port; in addition, it can also prevent the material from being discharged too quickly, which is convenient for collecting the material.

In a preferred solution, in the device for preparing dietary fiber powder, an end of the screw 18 near the feed port passes through a rectangular spline coupling 4 and a shaft output end of the reducer 3 Connected and locked with a nut, and the rotation direction of the nut is the same as the rotation direction of the screw 18, the input end of the reducer 3 is driven by the main motor 1 through a belt 2. Here, a connection method of the screw 18 and the speed reducer 3 is provided, which is stable in connection and convenient for disassembly and assembly.

In a preferred solution, in the device for preparing dietary fiber powder, one end of the screw cavity 10 is detachably connected to the output end of the speed reducer 3 through a coupling 21. Here, a connection manner of the screw cavity 10 and the speed reducer 3 is provided, so that the screw cavity 10 remains stable when the speed reducer 3 drives the screw 18 to rotate.

In a preferred solution, in the device for preparing dietary fiber powder, the screw located in the mixed shearing section 1901 is divided into three different section sections, and the pitch of each section section is from the feeding section 1801 to the The extrusion discharge section 1803 has a decreasing gradient. Here, re-dividing the screw 18 of the mixed shearing section 1901 can make the particle size and volume of the material entering the extrusion discharge section 1803 smaller and the materials more compact, so as to further improve the pair of extrusion discharge section 1803 The crushing, squeezing, kneading and shearing effect of the material.

In a preferred solution, the device for preparing dietary fiber powder is provided with slots on the threads of the mixed shearing section 1901 and the extrusion discharge section 1803. Here, the shape of the slot is not limited, as long as it can allow the material to pass through the slot, it can be a regular shape such as a circle, rectangle, triangle, or other irregular shape. Setting the slot helps to strengthen the screw 18 and the material. The crushing, kneading, shearing, and squeezing effects of the cellulose can make the particle size of the cellulose raw material at the discharge port smaller.

In a preferred solution, in the device for preparing dietary fiber powder, the two screws 18 are of a multi-segment structure, and each segment is connected by a rectangular spline 1804. Here, the screw 18 is configured as a multi-section detachable structure, which is convenient for disassembly, replacement and maintenance.

In a preferred solution, in the device for preparing dietary fiber powder, the screw cavity 10 is a multi-segment structure, and each segment is connected by a flange 22 and a bolt 23. Here, the screw cavity 10 is set as a multi-section detachable structure, which is convenient for disassembly, replacement and maintenance.

Step 1: The raw bagasse is decontaminated to obtain a preliminary bagasse with a content of at least 50% of the pulp. The pulp is mainly composed of thin-walled cells with short cell length, large walls and thin, porous sponges, and excellent water retention. Oil absorption performance, using bagasse as the raw material to ensure the product's high water retention and oil absorption, while improving the economic utilization efficiency of waste bagasse;

Step 2: Add the preliminary bagasse obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section 1801 to 50-80 ° C, the working temperature of the mixed shearing section 1901 to 80-120 ° C, squeeze The working temperature of the pressure discharge section 1803 is 120-180 ° C. The working temperature is gradually increased from the feeding section 1801 to the extrusion discharge section 1803. The residence time of the material in the screw cavity 10 ≤20min, the pressure of the material at the discharge port is controlled to 2-10MPa to obtain a single extrusion;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section 1801 to 50-80 ° C, the working temperature of the mixing and shearing section 1901 to 80-120 ° C, The working temperature of the pressure discharge section 1803 is 120-150 ° C. The working temperature is gradually increased from the feeding section 1801 to the extrusion discharge section 1803. The residence time of the material in the screw cavity 10 ≤10min, the pressure of the material at the discharge port is controlled to 0.5-5MPa to obtain a secondary extrusion material;

In a preferred embodiment, the method for preparing sugarcane dietary fiber powder based on a device for preparing dietary fiber powder, and the bleaching is a chlorine-free bleaching.

Step 1: Crush the softwood to 30 meshes and obtain the broken wood for future use. The softwood is selected as the raw material, which has better water absorption than the hardwood, and the prepared dietary fiber powder has better water and oil absorption properties;

Step 2: The crushed wood obtained in step 1 is added to the device for preparing dietary fiber powder, and the working temperature of the feeding section 1801 is set to 50-80 ° C, the working temperature of the mixed shearing section 1901 is 80-150 ° C, and extrusion is performed. The working temperature of the discharge section 1803 is 150-250 ° C. The working temperature is gradually increased from the feeding section 1801 to the extrusion discharge section 1803. The residence time of the material in the screw cavity 10 is ≤ 20min, the pressure of the material at the discharge port is controlled to 2-10MPa to obtain a single extrusion;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section 1801 to 50-80 ° C, the working temperature of the mixing-shearing section 1901 to 80-120 ° C, and squeeze. The working temperature of the pressure discharge section 1803 is 120-180 ° C. The working temperature is gradually increased from the feeding section 1801 to the extrusion discharge section 1803. The residence time of the material in the screw cavity 10 ≤10min, the pressure of the material at the discharge port is controlled to 0.5-5MPa to obtain a secondary extrusion material;

Dietary fiber powder prepared by the above method.

In a preferred solution, the dietary fiber powder further comprises compounding the dietary fiber powder with soluble dietary fiber, wherein the content of the soluble dietary fiber is 1-30%, and the soluble diet Fiber includes at least one of the following components: fructooligosaccharides, galactooligosaccharides, xylooligosaccharides, isomalttooligosaccharides, soy oligosaccharides, chitosan oligosaccharides, and inulin.

Example 1

Step 2: Add the preliminary bagasse obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 60 ° C, the working temperature of the mixed shearing section to 100 ° C, and the working temperature of the extrusion discharge section to 150 ° C, the residence time of the material in the screw cavity is 20min, and the pressure of the material at the discharge port is controlled to 5MPa to obtain a single extrusion;

Step 3: Put the primary extruded material obtained in Step 2 into a 3% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook for 1 hour at 1.5 MPa, and wash with neutral water until neutral. Then put it into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2h, dehydrate it to obtain a water-containing material with a water content of 25%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 80 ° C, the working temperature of the mixed shearing section to 120 ° C, and the working temperature of the extrusion discharge section 150 ° C, the residence time of the material in the screw cavity is 10min, and the pressure of the material at the discharge port is controlled to 0.5MPa to obtain a secondary extrusion material;

Step 5: drying and pulverizing the secondary extruded material obtained in step 4 to obtain sugarcane dietary fiber powder.

The fiber of the obtained sugarcane dietary fiber powder was soft, the total dietary fiber content was 96.3%, the water absorption ratio was 8.3, and the oil absorption ratio was 6.5. Among them, the total dietary fiber content was measured using GB 5009.88-2014; the water absorption ratio was calculated using the formula Q ₁ = (M ₂ -M ₁ ) / M ₁ , where Q ₁ is the water absorption ratio and M ₁ is the initial dietary fiber powder weight ( g), M ₂ is the weight of dietary fiber after water absorption (g); the oil absorption rate is calculated using the formula Q ₂ = (M ₃ -M ₁ ) / M ₁ , where Q ₂ is the oil absorption rate and M ₁ is the initial dietary fiber Powder weight (g), M ₃ is the dietary fiber weight (g) after oil absorption; the same applies hereinafter.

Example 2

Step 2: Add the preliminary bagasse obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50 ° C, the working temperature of the mixed shearing section to 80 ° C, and the working temperature of the extrusion discharge section to At 120 ° C, the residence time of the material in the screw cavity is 10 minutes, and the pressure of the material at the discharge port is controlled to 2 MPa to obtain a single extrusion;

Step 3: Put the primary extruded material obtained in Step 2 into a 3% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook for 1 hour at 1.5 MPa, and wash with neutral water until neutral. Then put it into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2 hours, dehydrate it to obtain a water-containing material with a water content of 35%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, and set the working temperature of the feeding section to 50 ° C, the working temperature of the mixed shearing section to 80 ° C, and the working temperature of the extrusion discharge section to At 120 ° C, the residence time of the material in the screw cavity is 10 minutes, and the pressure of the material at the discharge port is controlled to 5 MPa to obtain a secondary extrusion material;

The fiber of the obtained sugarcane dietary fiber powder was soft, the total dietary fiber content was 95.4%, the water absorption ratio was 8.0, and the oil absorption ratio was 6.0.

Example 3

Step 2: Add the preliminary bagasse obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 80 ° C, the working temperature of the mixed shearing section to 120 ° C, and the working temperature of the extrusion discharge section to 180 ° C, the residence time of the material in the screw cavity is 10min, and the pressure of the material at the discharge port is controlled to 10MPa to obtain a single extrusion;

Step 3: Put the primary extruded material obtained in Step 2 into a 3% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook for 1 hour at 1.5 MPa, and wash with neutral water until neutral. Then put it into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2 hours, dehydrate it to obtain a water-containing material with a water content of 50%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder. Set the working temperature of the feeding section to 70 ° C, the working temperature of the mixed shearing section to 100 ° C, and the working temperature of the extrusion discharge section to 140 ° C, the residence time of the material in the screw cavity is 10 minutes, and the pressure of the material at the discharge port is controlled to 2 MPa to obtain a secondary extrusion material;

The fiber of the obtained sugarcane dietary fiber powder was soft, the total dietary fiber content was 97.7%, the water absorption ratio was 9.2, and the oil absorption ratio was 7.6.

Example 4

Step 2: Add the crushed wood obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 60 ° C, the working temperature of the mixed shearing section to 120 ° C, and the working temperature of the extrusion discharge section to 200. ℃, the residence time of the material in the screw cavity is 15 minutes, and the pressure of the material at the discharge port is controlled to 8 MPa to obtain a single extrusion;

Step 3: Put the primary extruded material obtained in Step 2 into a 5% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook under 2MPa pressure for 2 hours, wash with hot water to neutrality, and then Put into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2 hours, dehydrate it to obtain a water-containing material with a water content of 50%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 70 ° C, the working temperature of the mixed shearing section to 110 ° C, and the work of the extrusion discharge section. The temperature is 160 ° C, the residence time of the material in the screw cavity is 8 minutes, and the pressure of the material at the discharge port is controlled to 3 MPa to obtain a secondary extrusion material;

Step five: drying and pulverizing the secondary extruded material obtained in step four to obtain a wood dietary fiber powder.

The fiber of the obtained wood dietary fiber powder was soft, the total dietary fiber content was 95.4%, the water absorption ratio was 8.9, and the oil absorption ratio was 6.6.

Example 5

Step 2: Add the crushed wood obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50 ° C, the working temperature of the mixed shearing section to 80 ° C, and the working temperature of the extrusion discharge section to 150. ℃, the residence time of the material in the screw cavity is 20min, the pressure of the material at the discharge port is controlled to 2MPa, and the material is extruded at one time;

Step 3: Put the primary extruded material obtained in Step 2 into a 5% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook under 2MPa pressure for 2 hours, wash with hot water to neutrality, and then Put it into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2h, dehydrate it to obtain a water-containing material with a water content of 20%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50 ° C, the working temperature of the mixed shearing section to 80 ° C, and the work of the extrusion discharge section. The temperature is 120 ° C, the residence time of the material in the screw cavity is 10 minutes, and the pressure of the material at the discharge port is controlled to 0.5 MPa to obtain a secondary extrusion material;

The fiber of the obtained wood dietary fiber powder was soft, the total dietary fiber content was 95.0%, the water absorption ratio was 8.2, and the oil absorption ratio was 6.0.

Example 6

Step 2: Add the crushed wood obtained in step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 80 ° C, the working temperature of the mixed shearing section to 150 ° C, and the working temperature of the extrusion discharge section to 250. ℃, the residence time of the material in the screw cavity is 10 minutes, and the pressure of the material at the discharge port is controlled to 10 MPa to obtain a single extrusion;

Step 3: Put the primary extruded material obtained in Step 2 into a 5% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook under 2MPa pressure for 2 hours, wash with hot water to neutrality, and then Put into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2 hours, dehydrate it to obtain a water-containing material with a water content of 30%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 80 ° C, the working temperature of the mixed shearing section to 120 ° C, and the work of the extrusion discharge section. The temperature is 180 ° C, the residence time of the material in the screw cavity is 10 minutes, and the pressure of the material at the discharge port is controlled to 5 MPa to obtain a secondary extrusion material;

The fiber of the obtained wood dietary fiber powder was soft, the total dietary fiber content was 95.9%, the water absorption ratio was 9.3, and the oil absorption ratio was 6.8.

Example 7

The dietary fiber powder prepared in Example 1 is mixed with soluble dietary fiber, wherein the content of the soluble dietary fiber is 10%, and the soluble dietary fiber is composed of 10 parts by weight of xylooligosaccharide.

Example 8

The dietary fiber powder prepared in Example 4 is mixed with soluble dietary fiber, wherein the content of the soluble dietary fiber is 30%, and the soluble dietary fiber is composed of 5 parts by weight of xylooligosaccharide and 5 parts by weight of It is composed of galactooligosaccharide and 10 parts by weight of inulin.

Comparative Example 1

Step 2: Put the preliminary bagasse obtained in Step 1 into a 3% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook for 1 hour at 1.5 MPa, wash with hot water to neutrality, and then Put it into a hydrogen peroxide solution with a pH value of 10 ± 0.5, with a solid-liquid ratio of 1:10. After bleaching at 80 ° C for 2h, dehydrate it to obtain a water-containing material with a water content of 25%;

Step 3: Add the water-containing material obtained in Step 2 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 80 ° C, the working temperature of the mixed shearing section to 120 ° C, and the working temperature of the extrusion discharge section to 150 ° C, the residence time of the material in the screw cavity is 10min, and the pressure of the material at the discharge port is controlled to 0.5MPa to obtain a secondary extrusion material;

Step 4. Dry and pulverize the secondary extrusion material obtained in step 3 to obtain sugarcane dietary fiber powder.

The fiber of the obtained sugarcane dietary fiber powder was rough, the total dietary fiber content was 90.2%, the water absorption ratio was 4.0, and the oil absorption ratio was 3.0.

Comparative Example 2

Step 2: Put the crushed wood obtained in step 1 into a 5% sodium hydroxide solution with a solid-liquid ratio of 1:10, cook under 2MPa pressure for 2h, wash with hot water until neutral, and then put In a hydrogen peroxide solution with a pH value of 10 ± 0.5, the solid-liquid ratio is 1:10. After bleaching at 80 ° C for 2 hours, the solution is dehydrated to obtain a water-containing material with a water content of 50%;

Step 3: Add the water-containing material obtained in Step 2 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 70 ° C, the working temperature of the mixed shearing section to 110 ° C, and the work of the extrusion discharge section. The temperature is 160 ° C, the residence time of the material in the screw cavity is 8 minutes, and the pressure of the material at the discharge port is controlled to 3 MPa to obtain a secondary extrusion material;

Step 4. Dry and pulverize the secondary extruded material obtained in step 3 to obtain a wood dietary fiber powder.

The fiber of the obtained wood dietary fiber powder was rough, the total dietary fiber content was 88.1%, the water absorption ratio was 4.2, and the oil absorption ratio was 3.0.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the applications listed in the description and the embodiments, it can be applied to various fields suitable for the present invention, and it will be easy for those familiar with the field. Additional modifications are implemented so that the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concepts defined by the claims and equivalent scope.

Claims

The device for preparing dietary fiber powder includes a screw cavity, a screw, a speed reducer, a feeding port, a feeding port, a support and a base, and the feeding port is arranged to discharge with a vertically arranged screw conveyor. The upper part of the vertically arranged screw conveyor is provided with a first opening on the side remote from the discharge port, and the first opening is connected and communicated with the discharge opening of the horizontally arranged screw conveyor. A second opening is provided at an upper portion of the horizontally arranged screw conveyor, and an upper portion of the second opening is provided with a feeding hopper connected to the second opening.
The apparatus for preparing dietary fiber powder according to claim 1, wherein the feeding hopper is provided with 1-4 agitators arranged at intervals in the vertical direction.
The apparatus for preparing dietary fiber powder according to claim 2, wherein the screw cavity is an open structure at both ends and is horizontally arranged, and the feeding port is provided at an upper part of one end of the screw cavity The other end of the screw cavity is a discharge port, and two screws are arranged in parallel in the screw cavity. One end of any screw near the feed port is driven by a speed reducer, and the screw is fed from the feed. The opening to the discharge opening are divided into a feeding section, a mixing shearing section, and an extrusion discharging section in order. The screw diameter of the feeding section is 30mm to 285mm, the pitch is 40mm to 320mm, and the length-to-diameter ratio is 5 to 55. The range is 60mm to 570mm, the screw diameter of the mixed shearing section is 30mm to 285mm, the pitch is 10mm to 320mm, the aspect ratio is 4 to 55, the lead is 60mm to 570mm, and the screw diameter of the extrusion discharge section The pitch is 30mm to 285mm, the pitch is 10mm to 320mm, the aspect ratio is 1 to 55, and the lead is 60mm to 570mm. The pitch on the screw decreases gradually from the feeding section to the extrusion discharge section.
The apparatus for preparing dietary fiber powder according to claim 3, further comprising a plurality of electric induction heating devices, which are respectively spaced apart from the outside of the screw cavity for feeding the screw cavity. Body heating; water-passing cooling device, comprising a water-cooled heat exchanger and a plurality of heat exchange tubes connected to the heat exchange tube, the plurality of heat exchange tubes are respectively sleeved on the outside of the screw cavity for feeding the screw The cavity is cooled down; multiple temperature sensors are spaced apart from the outside of the screw cavity, and above the multiple electric induction heating devices and at the discharge port are used to monitor the temperature of the screw cavity .
The apparatus for preparing dietary fiber powder according to claim 4, further comprising: a pressure regulating plate, which is disposed on the outside of the discharge port and is disposed in parallel with the pressure regulating plate, and the pressure regulating plate is set as It can slide in both directions along the direction of the discharge port to control the pressure of the discharge port; and a cover is sleeved on the outside of the discharge port and the pressure regulating plate to control the direction of the discharge.
The apparatus for preparing dietary fiber powder according to claim 5, wherein an end of the screw near the feed port is connected to a shaft output end of the reducer through a coupling of a rectangular spline, The nuts are locked together, and the rotation direction of the nut is the same as the rotation direction of the screw. The input end of the reducer is driven by a main motor through a belt.
The device for preparing dietary fiber powder according to claim 6, wherein one end of the screw cavity is detachably connected to the output end of the reducer through a coupling.
The apparatus for preparing dietary fiber powder according to claim 3, wherein the screw located in the mixed shearing section is divided into three different section sections, and the pitch of each section section is from the feeding section to the feeding section. The gradient of the extrusion discharge section is decreasing.
The apparatus for preparing dietary fiber powder according to claim 3, wherein a spiral groove is provided on the threads of the mixed shearing section and the extrusion discharge section.
The apparatus for preparing dietary fiber powder according to claim 3, wherein the two screws are of a multi-segment structure, and each segment is connected by a rectangular spline.
The apparatus for preparing dietary fiber powder according to claim 3, wherein the screw cavity has a multi-segment structure, and each segment is connected by a flange and a bolt.
The method for preparing sugarcane dietary fiber powder based on the apparatus for preparing dietary fiber powder according to any one of claims 1-11, comprising:

Step 1: removing impurities from the raw bagasse to obtain primary bagasse with a pulp content of at least 50%;

Step 2: Add the preliminary bagasse obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed-shearing section to 80-120 ° C, and squeeze the row. The working temperature of the material section is 120-180 ° C. The working temperature increases gradually from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤20min. The pressure at the outlet is controlled to 2-10MPa to obtain a single extrusion;

Step 3: The one-time extruded material obtained in step 2 is sequentially subjected to alkali cooking, washing, bleaching, and dehydration to obtain a water-containing material having a water content of 20-50%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed shearing section to 80-120 ° C, and squeeze the row The working temperature of the material section is 120-150 ° C. The working temperature increases gradually from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤10min. The pressure at the outlet is controlled to be 0.5-5MPa to obtain a secondary extrusion material;

Step 5: drying and pulverizing the secondary extruded material obtained in step 4 to obtain the obtained material.
The method for preparing sugarcane dietary fiber powder based on the apparatus for preparing dietary fiber powder according to claim 12, wherein the bleaching is a chlorine-free bleaching.
The method for preparing wood dietary fiber powder based on the apparatus for preparing dietary fiber powder according to any one of claims 1 to 11, comprising:

Step 1: Crush the softwood to 30 meshes, and obtain the broken wood for future use;

Step 2: Add the crushed wood obtained in Step 1 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed shearing section to 80-150 ° C, and squeeze the discharge. The working temperature of the section is 150-250 ° C. The working temperature is gradually increased from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤20min. The pressure at the discharge port is controlled to 2-10MPa to obtain a single extrusion;

Step 3: The one-time extruded material obtained in step 2 is sequentially subjected to alkali cooking, washing, bleaching, and dehydration to obtain a water-containing material having a water content of 20-50%;

Step 4. Add the water-containing material obtained in Step 3 to the device for preparing dietary fiber powder, set the working temperature of the feeding section to 50-80 ° C, the working temperature of the mixed shearing section to 80-120 ° C, and squeeze the row The working temperature of the material section is 120-180 ° C. The working temperature increases gradually from the feeding section to the extrusion discharge section. The residence time of the material in the screw cavity is ≤10min. The pressure at the outlet is controlled to be 0.5-5MPa to obtain a secondary extrusion material;

Step 5: drying and pulverizing the secondary extruded material obtained in step 4 to obtain the obtained material.
The method for preparing sugarcane dietary fiber powder based on an apparatus for preparing dietary fiber powder according to claim 14, wherein the bleaching is a chlorine-free bleaching.
The dietary fiber powder is prepared by the method according to claim 13 or 15.
The dietary fiber powder according to claim 16, further comprising compounding the dietary fiber powder with soluble dietary fiber, wherein the content of the soluble dietary fiber is 1-30%, and the solubility Dietary fiber includes at least one of the following components: fructooligosaccharides, galactooligosaccharides, xylooligosaccharides, isomalttooligosaccharides, soy oligosaccharides, chitosan oligosaccharides, and inulin.