CN111543665B - A 4D printer using microwave induction and its application - Google Patents

A 4D printer using microwave induction and its application Download PDF

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CN111543665B
CN111543665B CN202010387087.8A CN202010387087A CN111543665B CN 111543665 B CN111543665 B CN 111543665B CN 202010387087 A CN202010387087 A CN 202010387087A CN 111543665 B CN111543665 B CN 111543665B
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printing
neural network
printer
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CN111543665A (en
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张慜
郭超凡
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Jiangnan University
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    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23PSHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY A SINGLE OTHER SUBCLASS
    • A23P30/00Shaping or working of foodstuffs characterised by the process or apparatus
    • A23P30/20Extruding
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
    • A23L5/00Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/30Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation
    • A23L5/34Physical treatment, e.g. electrical or magnetic means, wave energy or irradiation using microwaves

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Abstract

本发明公开了一种利用微波诱导的4D打印机及其应用,属于食品加工技术领域。位于4D打印平台上的微波仓主要由微波屏蔽材料构成的微波防漏仓和置于平台下部的微波场发生装置构成。其中,微波防漏仓可随打印机喷头移动,并通过软性防微波泄露材料连接。微波固态源产生的微波能通过同轴电缆传输至置于微波防漏仓侧面的旋转天线涂布微波能量。微波功率可调节,物件温度可控。打印的物件可受微波仓内的微波场诱导,在打印过程中发生实时4D自发变化。同时,建立4D自发变化的预测模型以实现可控变化。本打印机可用于微波诱导下实现食品色、香、形自发变化的4D打印。并能够达到预测模型90%~95%的精度。

Figure 202010387087

The invention discloses a microwave-induced 4D printer and an application thereof, belonging to the technical field of food processing. The microwave bin located on the 4D printing platform is mainly composed of a microwave leak-proof bin made of microwave shielding material and a microwave field generating device placed at the lower part of the platform. Among them, the microwave leak-proof bin can move with the printer nozzle and is connected by a soft microwave-proof leak-proof material. The microwave energy generated by the microwave solid-state source is transmitted through the coaxial cable to the rotating antenna placed on the side of the microwave leak-proof chamber to apply the microwave energy. The microwave power can be adjusted, and the object temperature can be controlled. The printed object can be induced by the microwave field in the microwave chamber, and the real-time 4D spontaneous change occurs during the printing process. At the same time, a prediction model of 4D spontaneous changes is established to achieve controllable changes. This printer can be used for 4D printing of spontaneous changes in food color, aroma and shape under microwave induction. And can achieve the accuracy of 90% to 95% of the prediction model.

Figure 202010387087

Description

Microwave-induced 4D printer and application thereof
Technical Field
The invention relates to a microwave-induced 4D printer and application thereof, and belongs to the technical field of food processing.
Background
So-called 4D printing, precisely a material that is capable of automatic deformation, with only specific conditions (such as temperature, humidity, etc.) and without any need to connect any complex electromechanical devices, allows a fourth dimensional change to be made according to the product design, which usually involves color, flavor and shape. Khoo et al (2015) propose 4D printing as a process of building physical objects using appropriate additive manufacturing techniques, laying down a series of stimulus responsive composite or multi-materials with different properties. After construction, the object reacts to stimuli from the natural environment or through human intervention, resulting in changes in the physical or chemical state over time.
Heat treatment, an essential processing means in food processing, is an ideal stimulation condition for 4D printing of food. Microwave field heating is more efficient and heats more uniformly than conventional heat sources. The microwave field has more interaction mechanisms as a stimulation condition with the corresponding dielectric stimulus responsive material. The microwave field in combination with the dielectric material can provide more, more precise "programming" and control space than conventional thermal stimuli. Therefore, the introduction of the microwave field into the 4D printing of the food as a stimulus provides new ideas and means for the high efficiency and controllability of the 4D printing of the food. In the invention, the microwave field generating and controlling device is attached to a printing platform of a food printer, and provides a stable and continuous microwave field for an object printed by the printer to be used as a 4D change stimulus source, so that the printed object is prompted to generate real-time spontaneous 4D change again on the basis of 3D printing, and the concept of 4D printing is met.
37154, wintersweet et al (2018) invented a printing device (publication number: CN109049675A) for 3D food models, which solves the problem of low applicability of the prior art. The device includes frame, compounding mechanism and printing mechanism, and above-mentioned compounding mechanism and printing mechanism all connect in the frame, compounding mechanism can carry the printing raw materials after mixing to printing mechanism department, and 3D food model of setting for the shape can be printed out to above-mentioned printing mechanism. This 3D food model's printing device suitability is than higher. Zhanhong et al (2018) disclose a 3D food printing system (publication No. CN109042788A), the 3D food printing system comprises a feeder, a tray feeding conveyor, a 3D printer, a moving assembly and a tray discharging conveyor, when in use, the feeder continuously conveys raw materials into the 3D printer, the tray feeder conveys a tray to the moving assembly below the 3D printer, and when the tray is conveyed to the moving assembly through the tray feeding conveyor, the 3D printer prints the raw materials conveyed from the feeder into a specific three-dimensional shape on the tray. After printing, the tray is conveyed out by the tray-out conveyor belt, so that the full-automatic printing process of food forming is realized. This 3D printing system can accomplish a series of processes such as feed, send the dish, print and play dish in the food production process, and the course of working need not shut down reinforced, consequently can realize the continuous processing to food raw materials, has improved food machining efficiency and processingquality. Zhanhong et al (2018) disclose a collaborative precision nutritional food 3D printing system and method (publication No.: CN 109007945A). This 3D printing system includes conveyer, many 3D food printer, spare parts subassembly and six robots. The invention relates to a collaborative accurate nutritional food 3D printing system and a collaborative accurate nutritional food 3D printing method, wherein the system is a food 3D printer system cooperatively matched with six-axis robots, and the six-axis robots can complete automatic replacement of multiple charging barrels and automatic discharging of food models according to preset memorized positioning points, so that balanced food nutrition collocation and full automation of food 3D printing production are realized. Simultaneously, adopt many food 3D printers of conveyer belt cooperation to form the assembly line operation that accurate nutrition food 3D printed processing to can require layering subregion according to the raw materials ratio of accurate nutrition food and flow line preparation in proper order, realized the automated processing that the accurate nutrition 3D printed food was constructed by multiple food raw materials. Different from the above inventions, the printer in the invention is a 4D printer with microwave cooperation. The printer can realize real-time 4D spontaneous change through microwave field induction while 3D printing is carried out.
The petrology intelligence (2018) discloses a microwave-assisted 3D food printing device and method (publication number: CN109363221A), and the microwave-assisted 3D food printing device comprises a 3D printing box body, wherein a scanning area and a mixing area are respectively arranged above the inside of the 3D printing box body, a cooling area and a printing area are respectively arranged below the scanning area and the mixing area, an abrasive device and a storage tank are respectively arranged on two sides of the upper end of the 3D printing box body, a feeding port of the storage tank is arranged above the mixing area, and a computer digital control panel is arranged on one side of the 3D printing box body. The scanning district of setting, can scan food, wait for object external structure shape, can imitate according to the scanning shape and print in printing, the compounding district of setting can carry out the homogeneous mixing to the material that falls into in the storage tank, promote printing efficiency, the cooling space of setting is used for food to print the back, carry out cooling treatment to food as required, the food surface after making the printing solidifies, prevent to warp, the computer digital control panel of setting is used for setting for printing the parameter, this device, moreover, the steam generator is simple in structure, high durability and convenient operation, and is suitable for extensive popularization. Different from the invention, the material extrusion unit is an extrusion unit based on a piston principle, and can be linked with the microwave shielding unit to ensure that the material can avoid damaging the machine body and the control unit while receiving the interference of a stable microwave field.
Yanhao Li (2018) discloses an intelligent thermoelectric heating spray head (publication number: CN209346074U) of a food 3D printer, which comprises a nozzle, a CPU central control system, a feed delivery pipe, an extrusion device and a semiconductor refrigerating and heating device, wherein the feed delivery pipe, the extrusion device and the semiconductor refrigerating and heating device are respectively connected with the CPU central control system, the extrusion device is connected with the top of the feed delivery pipe, the bottom of the feed delivery pipe is connected with the semiconductor refrigerating and heating device, the nozzle is arranged at the inner side of the bottom of the feed delivery pipe, the semiconductor refrigerating and heating device comprises semiconductor refrigerating sheets arranged around the bottom of the feed delivery pipe, the semiconductor refrigerating sheets comprise a refrigerating end, a semiconductor cold end guide strip, an N-type semiconductor area, a P-type semiconductor area, a semiconductor hot end guide strip and a heating end which are sequentially arranged, the heating end is connected with the feed delivery pipe, and the. Compared with the prior art, the utility model has the advantages of solved shower nozzle heating problem, accelerated the cooling of printing the model after the nozzle ejection of compact, reduce the energy consumption, improve the cost of printing the precision, reducing food output. Different from the invention, the invention mainly relates to a microwave generating device which is a 4D food printer and has a heat source of 20-200W, and is continuously and linearly controllable at 2450 MHz.
Fig. schel K shaa (2018) discloses a method of treating a three-dimensionally printed object using microwave radiation (publication No.: CN 106794628A). The method for processing a three-dimensional printed object in such a method may include: the method includes providing a three-dimensional printed object formed from a printing mixture comprising a solidifiable matrix and a microwave absorber dispersed in the solidifiable matrix, and applying a focused input of microwave radiation to the printed object at one or more locations. Application of microwave radiation heats the microwave absorber at one or more locations and promotes consolidation of the printing mixture within the printed object. First, the method is mainly applied to non-food materials, and thus can disperse a microwave absorber in a printing material. On the contrary, the printing material in the method is a food material which can originally absorb the microwave, and the invention discloses a 4D printer and application, not a simple application method.
Vandamin et al (2019) disclose a food microwave three-dimensional printing method and a printer (publication number: CN 109820224A). the invention realizes the effect of instant curing of extruded materials by releasing microwaves at the front end through a microwave heating probe embedded in the inner wall of a charging barrel and combining the size setting of non-wave-absorbing materials; the heating efficiency of the product is effectively improved and microwave leakage and diffusion are prevented by designing the bell mouth and the choke groove of the leakage-proof unit and combining with the wave-absorbing material design of the printing platform; the microwave is generated by the microwave solid-state source and is conducted by the transmission line, so that the microwave output is stable, the power and the frequency can be adjusted according to the printing requirement, and the microwave solid-state source is small in size and convenient to integrate; the mode of heating curing makes the product structure mechanical strength who prints out high through the limit printing, can realize the preparation of cavity unsupported spatial structure, and the product molding is difficult for collapsing. Different from the invention, the microwave field is integrated on the printing platform of the 3D printer, and the microwave field can be stably and continuously provided for printing materials. The microwave shielding unit of the present invention is different from the microwave leakage preventing unit of the present invention in the operation mechanism. The microwave field in the present invention is mainly applied to the whole printing platform, and the microwave in the present invention is mainly applied to the vicinity of the nozzle. Therefore, the microwave field on the 3D printer platform has the capability of realizing the real-time 4D spontaneous change of the printed object.
Zhang 24924et al (2019) disclose a microwave-assisted three-dimensional printing device and an accurate and efficient printing method for a plant gel system (application number: 2019110028646), wherein the device comprises a three-dimensional printer, a built-in real-time microwave heating and curing device, a flexible microwave shielding box body, an embedded online microwave real-time controller and the like. The microwave source is a solid microwave source, and the power is continuously adjustable within the range of 20-200W. Microwave energy feedback is realized by adopting a rotary antenna mode, and the microwave can be uniformly absorbed by the material layer in the printing process. The device can realize the real-time heating solidification of printing in-process microwave at 3D, reaches the fast curing and improves and print the precision, shortens 3D under the full flow and prints the efficiency of production food. According to the material properties (such as rheological property and dielectric property), a matching relation is established between the printing extrusion speed of the material and the microwave real-time heating power in the 3D printing process, so that the material is cured at a proper speed, the printing precision of more than 95% is realized, and the material is not deformed in the subsequent process. Different from the reported device, the microwave field generated by the microwave solid-state source is transmitted to the lightweight rotary antenna positioned on the side surface of the fixed microwave shielding case through the coaxial cable and is uniformly coated in the whole microwave shielding case, so that the printing precision can be ensured to the maximum extent while the movement of the platform in the Y-axis direction is not influenced. The invention also discloses three microwave-catalyzed 4D printing methods, including deformation 4D printing, color-changing 4D printing and aroma-changing 4D printing, which are different from the purposes and implementation means of high-efficiency curing mentioned in the report.
Disclosure of Invention
The invention provides a stable microwave field for a printing platform on the basis of an extrusion type food 3D printing system to catalyze the real-time 4D spontaneous change of a printed object.
The technical scheme of the invention is as follows:
A4D printer induced by microwaves comprises a printing Cartesian coordinate driving unit, a material extruding unit, a microwave field output unit, a microwave field leakage preventing unit and a control unit 13; the material extrusion unit comprises a charging barrel, a charging barrel microwave shielding sleeve 7 and a microwave shielding printing nozzle 6; the microwave field output unit comprises a microwave solid source 1 and a rotary antenna coating rod 3; the microwave field leakage prevention unit comprises a fixed microwave shielding cover 4, an X-axis movable microwave shielding cover 8 and a Z-axis movable microwave shielding cover 5; the control unit 13 includes a microwave output power controller, a temperature measuring device, and a temperature controller.
Further, in the material extrusion unit, the charging barrel microwave shielding sleeve 7 is of a 304 stainless steel hollow structure, and can be placed in the charging barrel and shield a microwave field; the microwave shielding printing spray head 6 is in a 304 stainless steel structure, can be connected with the charging barrel through a screw, and has selectable nozzle diameters of phi 0.8, 1.2 and 1.5 mm.
Further, the microwave field output unit is arranged outside the 4D printer; wherein, the power supply power of the microwave solid source 1 is 500VA, 220V/50Hz, the output frequency is 2450MHz, the microwave energy can be accurately controlled, the continuous linear adjustment of the power of 20-200W can be realized, the control is accurate, and the reproducibility is good; the rotary antenna coating rod 3 is a microwave output device which is positioned on the side surface of the fixed microwave shielding case 4, and a stable and uniform microwave field is ensured to be provided in the microwave shielding bin where the printed object is positioned. Microwave energy generated by the microwave solid state source 1 is transmitted to the rotating antenna coating rod 3 via the coaxial cable 16.
Furthermore, the microwave field leakage-proof units are all made of 304 stainless steel, wherein the fixed micro-structure is arranged in the microwave field leakage-proof unitsThe wave shield 4 is fixed on the food 4D printer base; the Z-axis moving microwave shielding cover 5 is fixed on an X-axis moving slide bar 11 of the 4D printer and can move along the X-axis moving slide bar 11; the X-axis movable microwave shielding cover 8 is fixed on a material extrusion unit sliding block 10 and can move along the X axis with the material extrusion unit; adopting a structure for resisting current and preventing microwave leakage between different shielding cases (<1mw/cm2) And the influence of microwave leakage on other units and the damage to operators are avoided.
Furthermore, the microwave output power controller in the control unit 13 can realize that the microwave output power is continuously, linearly and accurately adjustable within 20-200W; the temperature measuring device 17 adopts an infrared online temperature measuring sensor, can display the temperature of the printed workpiece in real time, and has a temperature measuring range of 0-500 ℃; the control unit 13 is connected with the temperature measuring device 17 and the microwave source 1, and can realize the regulation and control of the microwave output of the microwave source within the control range of temperature.
The invention also provides a food 4D printing method using microwave induction, which comprises the following steps:
1) selecting proper printing parameters and the diameter of the microwave shielding printing nozzle 6 according to the rheological property and the type of the material to be printed;
2) setting the microwave output power and induced spontaneous change processing time of the microwave field output unit;
3) and 4D printing is carried out on the material to be printed according to the printing model.
A third object of the present invention is to provide a 4D printed prediction model of microwave-induced spontaneous deformation, discoloration and aroma, comprising:
1) temperature calculation of the printed article in the microwave field: calculating the temperature of each layer of the printed object in the microwave field according to an electromagnetic wave equation and a heat conduction equation, and calculating the value of the temperature T according to the following formula:
Figure BDA0002484441680000071
Figure BDA0002484441680000072
wherein, P is the power received by the printed object in the microwave field; epsilon0Is the relative dielectric constant of electromagnetic waves in vacuum; ε' is the dielectric loss factor of the printed material; e is the electric field strength; omega is angular frequency; ρ is the print density, cpIs the specific heat capacity of the printed material; t is the temperature of the printed object; t is time; k is the thermal conductivity of the printing material; f is the frequency of the microwaves generated by the microwave source.
2) Deformation model: and (4) adopting a Matlab tool and calling a BP neural network module to establish a three-layer BP neural network model. Setting algorithm parameters: the number of concealment layers is 10, and the training method is Levenberg-Marquardt. Setting an input layer as 1) to obtain the derived object temperature and microwave heating time; the output layer is a deformation bending angle. Inputting the selected training sample into a BP neural network, training the BP neural network, comparing the output value of the BP neural network with an actually measured value until the mean square error of the BP neural network training meets the requirement, and determining the weight and the threshold value of each layer of the BP neural network.
3) Color change model: and (4) adopting a Matlab tool and calling a BP neural network module to establish a three-layer BP neural network model. Setting algorithm parameters: the number of concealment layers is 10, and the training method is Levenberg-Marquardt. Setting an input layer as 1) to obtain the derived object temperature and microwave heating time; the output layer is the Lab color difference value compared to the original color. Inputting the selected training sample into a BP neural network, training the BP neural network, comparing the output value of the BP neural network with an actually measured value until the mean square error of the BP neural network training meets the requirement, and determining the weight and the threshold value of each layer of the BP neural network.
4) Fragrant change model: and programming by adopting Matlab language, and calling a BP neural network module to establish a three-layer BP neural network model. Setting algorithm parameters: the number of concealment layers is 10, and the training method is Levenberg-Marquardt. Setting an input layer as 1) to obtain the derived object temperature and microwave heating time; the output layer is the signal value of the target flavor substance measured by GC-MS. Inputting the selected training sample into a BP neural network, training the BP neural network, comparing the output value of the BP neural network with an actually measured value until the mean square error of the BP neural network training meets the requirement, and determining the weight and the threshold value of each layer of the BP neural network.
The invention has the beneficial effects that:
the invention provides a 4D printer and a method utilizing microwave induction, which can effectively realize the 4 th dimensional change of a food printing object under the catalysis of a microwave field; the microwave printing system integrates a small-dose microwave generating device and a coating system on a traditional food printing platform, and realizes a stable microwave field in a microwave shielding cabin which can move along with a Cartesian coordinate driving unit of a printer so as to test that a printed object can generate real-time 4D spontaneous changes (color, fragrance and type spontaneous changes). And the 4D spontaneous change in the invention can be predicted by a model, so that the programmable 4D printing is realized.
Drawings
FIG. 1 is a schematic illustration of the present invention.
In the figure: the device comprises a microwave solid source 1, a printing platform 2, a rotary antenna coating rod 3, a fixed microwave shielding cover 4, a movable microwave shielding cover 5Z axis, a shielded printing nozzle 6 microwave, a microwave shielding sleeve of a charging barrel 7, a movable microwave shielding cover 8X axis, a printed object 9, an extrusion unit slider 10, a movable sliding rod 11X axis, an extrusion piston 12, a control unit 13, a charging barrel A14, a charging barrel B15, a coaxial cable 16 and a temperature measuring device 17.
Detailed Description
The following is a further description of the invention with reference to specific examples.
Example 1: multi-layer spontaneous deformation 4D printing of wheat dough and oat fiber dough
Mixing wheat flour with water according to the weight ratio of 2.5: 1, mixing uniformly to prepare a wheat dough layer material, and filling the wheat dough layer material into a charging barrel A14. Mixing oat fiber powder, wheat starch and water according to the weight ratio of 2.5: 1: 2.5 mixing uniformly to prepare the oat fiber dough layer material, and filling the oat fiber dough layer material into a charging barrel B15. Selecting a microwave shielding printing nozzle 6 of a charging barrel A14 with the diameter of 1.2 mm; the diameter of the microwave shielding print head 6 of the cartridge B15 was selected to be 1.5 mm. The printing distance was set to 1.5mm and the moving speed of the head was set to 30 mm/s. The input printing model can control the two materials to be alternately stacked in the printing process. Performing model prediction according to a designed target 4D deformation result, and setting the output microwave power of a microwave field generating device (a microwave solid-state source 1 and a rotary antenna coating rod 3) to be 120W according to input parameters of a prediction model; the temperature of the control unit 13 was set to 80 ℃. Because the wheat dough layer can be dehydrated and shrunk during the microwave field treatment, the oat fiber dough layer can not be shrunk due to dehydration. Under the induction of 120W microwave field, the temperature of the printed article is controlled by the control unit 13 to float within the range of 80 +/-3 ℃. The printed wheat dough/oat fiber dough alternately superposed printed article can be subjected to layer-by-layer real-time spontaneous 4D deformation bending within 20min due to shrinkage difference of each layer, and bending deformation within a range of 15-90 degrees can be realized. Finally, the overall deformation precision can reach more than 90% of the model predicted value.
Example 2: wheat dough spontaneous color-changing 4D printing
Mixing edible soybean oil and pigment oil according to the weight ratio of 9: 1, mixing uniformly to prepare the diluted pigment oil. 1% gum arabic aqueous solution, 1% gelatin aqueous solution and diluted pigment oil were mixed in a 50: 50: 1, and dispersing at 3000 rpm for 3 min. After dispersing evenly, adjusting the pH value to 4 by using 1% acetic acid aqueous solution, and then stirring at constant speed for 30min in a water area at 4 ℃. Standing after stirring, and layering. Taking out the precipitate, and freeze-drying at-80 deg.C under 220Pa for 22 hr to obtain the color-changing powder.
Mixing wheat flour with water according to the weight ratio of 2.5: 1, mixing uniformly to prepare a wheat dough layer material, and filling the wheat dough layer material into a charging barrel A14. Mixing wheat flour with water according to the weight ratio of 2.5: 1, mixing, adding 1% color-changing powder (w/w), and filling into barrel B15. Selecting a microwave shielding printing nozzle 6 of a charging barrel A14 with the diameter of 1.2 mm; the diameter of the microwave shielding print head 6 of the cartridge B15 was selected to be 1.2 mm. The printing distance was set to 1.2mm and the moving speed of the head was set to 25 mm/s. The input printing model can control the two materials to be alternately stacked in the printing process. Performing model prediction according to a designed target 4D color change result, and setting the output microwave power of a microwave field generating device (a microwave solid-state source 1 and a rotary antenna coating rod 3) to be 180W according to input parameters of a prediction model; the temperature of the control unit 13 is set to 90 deg.c. The temperature of the material is controlled by the control unit 13 to stably float within the range of 90 +/-3 ℃ during the printing process. Because the color-changing wheat dough layer contains the color-changing powder sensitive to microwaves, the color-changing powder is damaged to release pigments under the microwave field treatment, so that the color of the color-changing wheat dough layer spontaneously changes layer by layer within 2min layer by layer along with the printing process in the printing process. The printer can realize the color change of the delta E value (compared with the color difference value of the original sample) within the range of 1.80-9.79. The final color change precision can reach more than 95% of the predicted value of the model. The color-changing area in the printed object can be regulated and controlled by a printing model established in advance, and controllable 4D real-time spontaneous color changing is realized.
Example 3: self-fragrance-emitting 4D printing method for fruit and vegetable dough
Mixing edible soybean oil and flavor oil according to a ratio of 4: 1, uniformly mixing to prepare the diluted flavor oil. 1% gum arabic aqueous solution, 1% gelatin aqueous solution and diluted pigment oil were mixed in a 50: 50: 1, and dispersing at 3000 rpm for 3 min. After dispersing evenly, adjusting the pH value to 4 by using 1% acetic acid aqueous solution, and then stirring at constant speed for 30min in a water area at 4 ℃. Standing after stirring, and layering. Taking down the precipitate, and freeze-drying at-80 deg.C under 220Pa for 20 hr to obtain fragrant powder.
Mixing fruit and vegetable powder, wheat flour and water according to the weight ratio of 1: 25: 10 are mixed evenly to prepare the wheat dough layer material which is filled into a charging barrel A14. Mixing fruit and vegetable powder, wheat flour and water according to the weight ratio of 1: 25: 10, mixing uniformly, adding 1% of flavor-changing powder (w/w), uniformly preparing into a flavor-changing wheat dough layer material, and filling into a charging barrel B15. Selecting a microwave shielding printing nozzle 6 of a charging barrel A14 with the diameter of 1.5 mm; the diameter of the microwave shielding print head 6 of the cartridge B15 was selected to be 1.5 mm. The printing distance was set to 1.5mm and the moving speed of the head was set to 30 mm/s. The input printing model can control the two materials to be alternately stacked in the printing process. Performing model input prediction according to a designed target 4D color change result, and setting the output microwave power of a microwave field generating device (a microwave solid-state source 1 and a rotary antenna coating rod 3) to be 140W according to prediction model parameters; the temperature of the control unit 13 was set to 70 ℃. The temperature of the material is controlled by the control unit 13 to be stabilized in a range of 70 +/-3 ℃ during the printing process. Because the flavor-changed wheat dough layer contains the flavor-changed powder sensitive to microwaves, the flavor-changed powder is damaged to release flavor oil under the microwave field treatment, so that the flavor release occurs layer by layer within 3min layer by layer along with the printing process during the printing process of the flavor-changed wheat dough layer. The printer can realize spontaneous release of target flavor substances by the flavor-changing layer, and the percentage of the released flavor substances in the total flavor substances can reach 33.79-35.51% through GC-MS detection. Compared with the aroma variation degree obtained by a prediction model, the aroma variation precision can reach more than 95%. The odor-changing area in the printed object can be regulated and controlled by a printing model established in advance, and controllable spontaneous 4D fragrance change is realized.

Claims (6)

1.一种利用微波诱导的4D打印机的应用,其特征在于,所述的4D打印机包括打印笛卡尔坐标驱动单元、物料挤出单元、微波场输出单元、微波场防泄漏单元、控制单元(13);其中,物料挤出单元包括料筒、料筒微波屏蔽套筒(7)、微波屏蔽打印喷头(6);微波场输出单元包括微波固态源(1)、旋转天线涂布棒(3);微波场防泄漏单元包括固定微波屏蔽罩(4)、X轴移动微波屏蔽罩(8)、Z轴移动微波屏蔽罩(5);控制单元(13)包括微波输出功率控制器、测温装置和温度控制器;1. an application of the 4D printer utilizing microwave induction, is characterized in that, described 4D printer comprises printing Cartesian coordinate drive unit, material extrusion unit, microwave field output unit, microwave field leakage prevention unit, control unit (13 ); wherein, the material extruding unit includes a barrel, a microwave shielding sleeve (7), and a microwave shielding printing nozzle (6); the microwave field output unit includes a microwave solid-state source (1), a rotating antenna coating rod (3) The microwave field leakage prevention unit includes a fixed microwave shield (4), an X-axis movable microwave shield (8), and a Z-axis mobile microwave shield (5); the control unit (13) includes a microwave output power controller and a temperature measuring device and temperature controller; 利用所述的4D打印机对食品物料进行4D打印,具体包括:Use the 4D printer to 4D print food materials, including: (1)根据待打印物料的流变特性及种类选择适合的打印参数及微波屏蔽打印喷头(6)的直径;(1) Select suitable printing parameters and the diameter of the microwave shielding printing nozzle (6) according to the rheological properties and types of the material to be printed; (2)设定微波场输出单元的微波输出功率、诱导自发变化处理时间;(2) Setting the microwave output power of the microwave field output unit and the processing time of induced spontaneous change; (3)根据打印模型对待打印的物料进行4D打印。(3) 4D printing the material to be printed according to the printing model. 2.根据权利要求1所述的一种利用微波诱导的4D打印机的应用,其特征在于,所述的物料挤出单元中,料筒微波屏蔽套筒(7)为304不锈钢中空结构,可将料筒置于其中并屏蔽微波场;微波屏蔽打印喷头(6)为304不锈钢结构,可与料筒通过螺口连接,其喷嘴直径可选,分别为Φ0.8、1.2、1.5mm。2. The application of a microwave-induced 4D printer according to claim 1, characterized in that, in the material extrusion unit, the barrel microwave shielding sleeve (7) is a 304 stainless steel hollow structure, which can The barrel is placed in it and shields the microwave field; the microwave shielding printing nozzle (6) is of 304 stainless steel structure and can be connected to the barrel through a screw. 3.根据权利要求1所述的一种利用微波诱导的4D打印机的应用,其特征在于,所述的微波场输出单元设置于4D打印机外部;其中,微波固态源(1)电源功率为500VA、220V/50Hz,输出频率为2450MHz,可实现功率20-200W连续线性可调;旋转天线涂布棒(3)为微波输出装置,位于固定微波屏蔽罩(4)侧面,确保为打印物件所在的微波屏蔽仓内提供稳定、均匀的微波场,微波固态源(1)产生的微波能通过同轴电缆(16)传输至旋转天线涂布棒(3)。3. The application of a microwave-induced 4D printer according to claim 1, wherein the microwave field output unit is arranged outside the 4D printer; wherein, the microwave solid-state source (1) power supply is 500VA, 220V/50Hz, the output frequency is 2450MHz, and the power can be continuously adjusted linearly from 20 to 200W; the rotating antenna coating rod (3) is a microwave output device, which is located on the side of the fixed microwave shielding cover (4) to ensure that it is the microwave where the printed object is located. A stable and uniform microwave field is provided in the shielding chamber, and the microwave energy generated by the microwave solid state source (1) is transmitted to the rotating antenna coating rod (3) through the coaxial cable (16). 4.根据权利要求1所述的一种利用微波诱导的4D打印机的应用,其特征在于,所述的微波场防泄漏单元均为304不锈钢材质,其中,固定微波屏蔽罩(4)被固定在4D打印机底座上;Z轴移动微波屏蔽罩(5)固定于4D打印机X轴移动滑杆(11)上,可随X轴移动滑杆(11)移动;X轴移动微波屏蔽罩(8)固定于物料挤出单元滑块(10)上,并与物料挤出单元同时可延X轴移动;不同屏蔽罩之间采用抗流防微波泄漏结构,<1mw/cm2,避免微波泄露对其它单元的影响和对操作人员造成伤害。4. The application of a microwave-induced 4D printer according to claim 1, wherein the microwave field leakage prevention unit is made of 304 stainless steel, wherein the fixed microwave shield (4) is fixed on the On the base of the 4D printer; the Z-axis mobile microwave shielding cover (5) is fixed on the X-axis moving slide bar (11) of the 4D printer, and can move with the X-axis moving slide bar (11); the X-axis moving microwave shielding cover (8) is fixed It is placed on the slider (10) of the material extrusion unit, and can move along the X axis at the same time as the material extrusion unit; the anti-current and anti-microwave leakage structure is adopted between different shielding covers, <1mw/cm 2 , to avoid microwave leakage to other units impact and injury to the operator. 5.根据权利要求1所述的一种利用微波诱导的4D打印机的应用,其特征在于,所述的控制单元(13)中的微波输出功率控制器可实现微波输出功率20-200W连续、线性、精确可调;测温装置(17)采用红外在线测温传感器,可实时显示打印工件的温度,测温范围为0-500℃;控制单元(13)与测温装置(17)和微波固态源(1)连接,可实现在控制范围温度内调控微波固态源的微波输出。5. The application of a microwave-induced 4D printer according to claim 1, characterized in that, the microwave output power controller in the control unit (13) can realize a continuous, linear microwave output power of 20-200W , precise and adjustable; the temperature measuring device (17) adopts an infrared online temperature measuring sensor, which can display the temperature of the printed workpiece in real time, and the temperature measuring range is 0-500 ° C; the control unit (13) and the temperature measuring device (17) and the microwave solid state The source (1) is connected, and the microwave output of the microwave solid-state source can be regulated and controlled within the temperature of the control range. 6.一种利用微波诱导的4D打印机的应用,其特征在于,对食品物料进行4D打印的过程中,建立微波诱导的自发形变、色变、香变的预测模型,具体如下:6. An application of a microwave-induced 4D printer, characterized in that, in the process of 4D printing the food material, a prediction model of microwave-induced spontaneous deformation, color change, and aroma change is established, and the details are as follows: (1)微波场中打印物件的温度模型:根据电磁波动方程和热传导方程计算微波场中每层打印物件的温度,根据下述公式计算温度T的值:(1) The temperature model of the printed object in the microwave field: Calculate the temperature of each layer of the printed object in the microwave field according to the electromagnetic wave equation and the heat conduction equation, and calculate the value of the temperature T according to the following formula:
Figure FDA0002957517220000021
Figure FDA0002957517220000021
Figure FDA0002957517220000022
Figure FDA0002957517220000022
其中,P为微波场中打印物件所接收到的功率;ε0为电磁波在真空中的相对介电常数;ε″为打印物料的介电损耗因子;E为电场强度;ω为角频率;ρ为打印材料密度,cp为打印材料的比热容;T为打印物件的温度;t为时间;k为打印材料的热导率;f为微波源产生的微波频率;Among them, P is the power received by the printed object in the microwave field; ε 0 is the relative permittivity of electromagnetic waves in vacuum; ε″ is the dielectric loss factor of the printing material; E is the electric field strength; ω is the angular frequency; ρ is the density of the printing material, cp is the specific heat capacity of the printing material; T is the temperature of the printed object; t is the time; k is the thermal conductivity of the printing material; f is the microwave frequency generated by the microwave source; (2)形变模型:采用Matlab工具,并调用BP神经网络模块建立三层BP神经网络模型;算法参数设置:隐藏层数10,训练方法为Levenberg-Marquardt;设定输入层为(1)求导出的物件温度和微波加热时间;输出层为形变弯折角度;将选取的训练样本输入到BP神经网络中,对BP神经网络进行训练,将BP神经网络的输出值与实测值进行对比,直到BP神经网络训练的均方误差达到要求,确定BP神经网络各层的权值和阈值;(2) Deformation model: use the Matlab tool and call the BP neural network module to build a three-layer BP neural network model; algorithm parameter settings: the number of hidden layers is 10, and the training method is Levenberg-Marquardt; set the input layer as (1) to derive object temperature and microwave heating time; the output layer is the deformation and bending angle; input the selected training samples into the BP neural network, train the BP neural network, and compare the output value of the BP neural network with the measured value until BP The mean square error of the neural network training meets the requirements, and the weights and thresholds of each layer of the BP neural network are determined; (3)色变模型:采用Matlab工具,并调用BP神经网络模块建立三层BP神经网络模型;算法参数设置:隐藏层数10,训练方法为Levenberg-Marquardt;设定输入层为(1)求导出的物件温度和微波加热时间;输出层为相较于原始颜色的Lab色差值;将选取的训练样本输入到BP神经网络中,对BP神经网络进行训练,将BP神经网络的输出值与实测值进行对比,直到BP神经网络训练的均方误差达到要求,确定BP神经网络各层的权值和阈值;(3) Color change model: use the Matlab tool and call the BP neural network module to build a three-layer BP neural network model; algorithm parameter settings: the number of hidden layers is 10, and the training method is Levenberg-Marquardt; set the input layer as (1) to find The derived object temperature and microwave heating time; the output layer is the Lab color difference value compared to the original color; input the selected training samples into the BP neural network, train the BP neural network, and compare the output value of the BP neural network with The measured values are compared until the mean square error of the BP neural network training meets the requirements, and the weights and thresholds of each layer of the BP neural network are determined; (4)香变模型:采用Matlab语言编程,并调用BP神经网络模块建立三层BP神经网络模型;算法参数设置:隐藏层数10,训练方法为Levenberg-Marquardt;设定输入层为(1)求导出的物件温度和微波加热时间;输出层为GC-MS测定的目标风味物质的信号值;将选取的训练样本输入到BP神经网络中,对BP神经网络进行训练,将BP神经网络的输出值与实测值进行对比,直到BP神经网络训练的均方误差达到要求,确定BP神经网络各层的权值和阈值。(4) Fragrant change model: use Matlab language programming, and call the BP neural network module to build a three-layer BP neural network model; algorithm parameter settings: the number of hidden layers is 10, and the training method is Levenberg-Marquardt; set the input layer to (1) Calculate the derived object temperature and microwave heating time; the output layer is the signal value of the target flavor substance determined by GC-MS; input the selected training samples into the BP neural network, train the BP neural network, and use the output of the BP neural network The value is compared with the measured value until the mean square error of the BP neural network training meets the requirements, and the weights and thresholds of each layer of the BP neural network are determined.
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