Disposable food 3D printing feeding device and sterilization method thereof

Abstract

The invention relates to the technical field of food 3D printing, in particular to a disposable food 3D printing feeding device and a sterilization method thereof. The feeding device is composed of a charging barrel and a printing nozzle, the charging barrel is made of a modified soft polylactic acid (Soft PLA) material, and the printing nozzle is made of a polyphenyl sulfone (PPSU) material. The charging barrel is designed to be of a telescopic sawtooth-shaped structure, so that material extrusion is facilitated, and material residues can be reduced. Three common food 3D printing nozzle diameter specifications are designed for the printing nozzle, so that diversified printing requirements are met. The materials and the printing auxiliaries are evenly mixed and added into a charging barrel, then the charging barrel and the printing nozzle are bonded through an environment-friendly adhesive, sterilization is carried out, and the disposable feeding device is obtained. According to the feeding device, the blank of a one-time feeding device in the field of food 3D printing is filled up, the refreshing time of 3D printed food is prolonged, and a brand new thought and possibility are provided for industrial production of food 3D printing.

Description

Technical Field

[0001] The present invention relates to the field of food 3D printing, and in particular to a disposable food 3D printing feeding device and a sterilization method thereof. Background Art

[0002] As an emerging personalized food manufacturing method, food 3D printing technology has received widespread attention in recent years. It makes food raw materials into printable gels, extrude and stack them layer by layer using the nozzle of a food 3D printer, and thus realizes personalized customization of food. This technology can not only meet people's diverse needs for food shape, taste and nutrition, but also reduce food waste and improve production efficiency to a certain extent.

[0003] However, despite the many advantages of food 3D printing technology, it still faces some challenges in practical applications. First of all, most of the existing food 3D printing feeding systems adopt a ready-to-use method, often using complex stirring and gelatinization processes, with a long production cycle and low efficiency, which makes it difficult to meet the needs of industrialization. Secondly, traditional food 3D printing feeding devices are generally reused, which not only increases the difficulty of cleaning and maintenance, but also may cause cross-contamination of food and affect food safety. In addition, the nozzle diameter of food 3D printing has a crucial influence on the printing effect. A nozzle diameter that is too large or too small will lead to problems such as reduced printing accuracy and poor molding effect. The nozzle diameter of the food 3D printers currently on the market is fixed, and cannot be flexibly adjusted according to different food raw materials and printing requirements, which to a certain extent limits the scope of application of food 3D printing technology.

[0004] In the process of food 3D printing, food sterilization is a key link to ensure food safety. These include pasteurization, temperature and pressure sterilization, microwave sterilization and radio frequency sterilization. Pasteurization is a mild heat treatment method that kills pathogenic bacteria in food by maintaining a certain period of time at a low temperature, while maximizing the retention of food nutrients and flavor. Temperature and pressure sterilization sterilizes food through high-temperature and high-pressure steam, which can effectively kill all microorganisms in food, including spores. Microwave sterilization uses the thermal and non-thermal effects of microwaves to kill microorganisms in food in a short time while maintaining the quality of food. However, microwave sterilization has high requirements for equipment, and local overheating may occur when processing uneven food. Radio frequency sterilization uses the action of high-frequency electromagnetic fields to produce polarization effects on microorganisms in food, thereby achieving the purpose of sterilization. This method has the advantages of fast sterilization speed, low energy consumption, and little impact on food quality. It has not yet been widely used in the field of food 3D printing.

[0005] In summary, at present, there is no disposable food 3D printing feeding device made entirely of degradable plastics, which is not only not conducive to the industrialization of food 3D printing, but also may pose a potential threat to food safety. In view of the shortcomings of the prior art, the present invention proposes a disposable food 3D printing feeding device and a sterilization method thereof.

[0006] Jiang Hao (2022) invented the application of radio frequency modified starch in the preparation of special raw materials for 3D printing, which relates to the field of food processing technology. The present invention uses natural potato starch as the base material and uses a radio frequency processor to modify the starch. After the modification, the starch sticks to the wall less; the extrudate has strong fluidity and relatively high printing accuracy, which improves the lubricity and mechanical strength of the product. Guo Ziang (2022) invented a method for preparing algae food by 3D printing based on gel. The present invention belongs to the field of new food processing, and specifically relates to a method for preparing algae food by 3D printing based on gel. The steps are as follows: select edible glue to dissolve in a solvent, and obtain printing raw materials after stirring; write a 3D model printing model according to the principle of increasing the contact area between algae and culture medium and stabilizing the model, and then set the printing speed, flow rate and printing temperature parameters and slice; then inoculate the algae in the algae culture medium for cultivation, obtain an algae solution and mix it with the printing raw materials to obtain a mixture, load it into the material barrel of the food 3D printer, adjust the parameters for printing, and then solidify and cross-link the obtained product to obtain a solidified and cross-linked printed product, and finally place it in the algae culture medium, and obtain algae food after cultivation. The present invention selects natural algae as a printing material component, and promotes its growth and reproduction, meets the personalized flavor and nutritional needs of consumers, and is easy to operate, safe and environmentally friendly, and widely used. The above invention is difficult to make materials, has a short shelf life, and is prone to cross contamination when using traditional feeding devices. The present invention can effectively improve the shelf life of materials, and a disposable feeding device can also avoid cross contamination, ensure food safety, and realize industrial mass production.

[0007] Xiao Hongtao (2023) invented a food 3D printing device and a method for quickly switching the nozzle type of the same, which is characterized in that it is realized by using a nozzle nozzle type quick switching mechanism, and the nozzle nozzle type quick switching mechanism includes a rotating and pressing mechanism, a connecting rod mechanism, a plurality of nozzle type combination pieces and an extrusion discharge channel assembled together, and a plurality of connecting rod groups are provided on the connecting rod mechanism, and an extrusion rod is provided on the rotating and pressing mechanism, and the extrusion rod rotates with the rotating and pressing mechanism and cooperates with different connecting rod groups during the rotation process; a conical discharge port is provided on the extrusion discharge channel, and each of the connecting rod groups constitutes an active installation that fits in and away from the conical discharge port; the nozzle type combination The piece is fixedly mounted on the corresponding connecting rod group, and the mouth type combination pieces of different connecting rod groups together form different nozzle mouth shapes; when working, the rotating and pressing mechanism is rotated to the position corresponding to the connecting rod group, and then the connecting rod group is pushed by the extrusion rod, thereby driving the mouth type combination piece to fit with the conical discharge port to form a corresponding nozzle mouth shape, completing the nozzle combination process of the extrusion type food 3D printer nozzle, and preparing for the artistic processing of food 3D printing; when the nozzle mouth shape needs to be switched, it is only necessary to rotate the rotating and pressing mechanism to the corresponding position of the different connecting rod groups, and then press and push the corresponding connecting rod groups to achieve the switching of different nozzle mouth shapes. Huang Jie (2014) invented a 3D printing device and its feed pipe, which are related to the field of food 3D printing. The present invention overcomes the defect that the shape and size of the material extruded by the current 3D printing device cannot be adjusted as needed. The device includes a feed pipe for feeding the printing material and a nozzle that can extrude the printing material. The end of the feed pipe is a nozzle. The nozzle is provided with a connecting structure for detachable connection. The nozzle is detachably connected to the nozzle through the connecting structure on the nozzle. The 3D printing device of the embodiment of the present application can adjust the cross-sectional shape and size of the extruded printing material as needed. Compared with the above invention, the present invention simplifies the nozzle structure and improves the printing efficiency. The retractable serrated barrel structure also reduces and improves the utilization rate of the material, reduces the problem of material residue, and reduces resource consumption and machine wear. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of existing food 3D printing feeding devices, such as complex feeding systems, difficult cleaning and maintenance, low printing efficiency, and serious material residues. In response to these problems, the present invention proposes a disposable food 3D printing feeding device and a sterilization method thereof, aiming to simplify the structure of the feeding device, improve printing efficiency and food safety, and at the same time extend the shelf life of food, thereby realizing the industrialization of food 3D printing.

[0009] The technical solution of the present invention:

[0010] A disposable food 3D printing feeding device comprises a barrel 1 and a printing nozzle 5. A bonding portion 2 is provided between the barrel 1 and the printing nozzle 5, a rear end of the bonding portion 2 of the printing nozzle 5 is a filling port 3, and a lower end of the printing nozzle 5 is a nozzle cutting portion 4, which can cut the outlet diameter of the printing nozzle 5 as needed.

[0011] Furthermore, the barrel 1 has a serrated telescopic structure in its axial cross section, which avoids material residue and facilitates the installation of the device; preferably, the diameter is 30 mm and the capacity is 200 ml, which can be adapted to common food 3D printers on the market.

[0012] Furthermore, the barrel 1 is made of soft modified polylactic acid (Soft PLA) material, which is heat-resistant soft polylactic acid obtained by modifying polylactic acid, which is non-toxic and harmless and meets food safety standards.

[0013] Furthermore, the nozzle cutting part 4 is set to different specifications, and the nozzle outlet diameters are 1.2mm, 0.8mm and 0.6mm from top to bottom, respectively. The cut line is cut according to practical conditions, and the nozzle outlet diameter is selected. This design can flexibly adapt to the rheological properties and printing effect requirements of different food raw materials.

[0014] Furthermore, the printing nozzle 5 is made of polyphenylsulfone (PPSU) material.

[0015] In another aspect, the present invention provides a method for sterilizing a disposable food 3D printing feeding device, comprising the following steps:

[0016] S1, mixing printing materials and printing aids to prepare a gel, and adding the gel to the barrel 1 after homogenization;

[0017] S2, using chitosan-citric acid composite adhesive to assist in bonding the barrel 1 and the printing nozzle 5 after adding the material.

[0018] S3, sterilize the sealed feeding device.

[0019] S4, when in use, cut the required printing nozzle diameter at the nozzle cutting position 4 and then install it into the printer for use.

[0020] S5, after use, remove and discard the feeding device.

[0021] Furthermore, in step S1, the printing aids include thickeners (such as pectin), proteins (such as pea protein isolate), carbohydrates (such as potato starch) and inorganic salts (such as sodium chloride).

[0022] Furthermore, in step S1, the powder material is filtered through a sieve to ensure the maximum particle size, and the material mixture powder is 60-120 mesh.

[0023] Furthermore, in step S1, the gel is homogenized by manual stirring, high-speed stirring, ultrasonic vibration or high-pressure homogenization (pressure 100-150 mPa), etc., in order to make the viscosity of the material reach 10 2 -10 8 mPa·s to improve the rheological properties and printing performance of the gel.

[0024] Furthermore, in the step S2, the chitosan-citric acid composite adhesive used performs well in an environment of 100°C and below, can maintain stable bonding performance, and can also ensure the sealing and stability of the device, avoid material leakage and cross contamination, and is non-toxic and harmless, meeting environmental protection requirements.

[0025] Further, in step S3, the sterilization method is pasteurization, microwave sterilization, radio frequency sterilization or temperature and pressure sterilization. The sterilization conditions are respectively pasteurization: temperature 60℃-85℃, time 5min-30min, microwave sterilization: temperature 70℃-100℃, time 30s-5min, power 400w-4000w, radio frequency sterilization: frequency 27.12MHz, power 1500W, plate spacing 10-12cm, hot air temperature 55℃-75℃, time 5min-10min, temperature and pressure sterilization: pressure 600MPa, time 2min-5min, temperature 50℃-85℃. By optimizing the sterilization conditions and methods, the present invention effectively extends the shelf life of food.

[0026] Furthermore, the design of the disposable food 3D printing feeding device is suitable for a variety of food materials, including but not limited to fruits and vegetables, pasta products and meat products.

[0027] Beneficial effects of the present invention:

[0028] 1) Simplified feeding device: The present invention adopts a disposable feeding device design, which avoids the shortcomings of the traditional feeding system that needs to be prepared on the spot, simplifies the production process, shortens the production cycle, and can meet the needs of large-scale industrial production. At the same time, the present invention designs three nozzles with different diameters (1.2mm, 0.8mm, 0.6mm) and provides nozzle cutting lines. Users can flexibly select the nozzle diameter according to actual needs, thereby improving printing efficiency. The retractable serrated barrel structure also reduces and improves the utilization rate of materials, reduces the problem of material residue, and reduces resource consumption and machine wear.

[0029] 2) Food safety: The disposable feeding device reduces the pollution of waste to the environment and reduces resource consumption. It also avoids the cleaning difficulties and cross-contamination problems that may be caused by the repeated use of traditional feeding devices, effectively ensuring food safety.

[0030] 3) Extend the shelf life: The present invention combines a variety of sterilization technologies (such as pasteurization, radio frequency sterilization, etc.) to effectively extend the shelf life of food. In addition, the present invention uses an environmentally friendly adhesive to bond the barrel and the nozzle device to ensure the sealing of the device and avoid material leakage and cross contamination.

[0031] 4) Wide applicability: The feeding device design of the present invention is suitable for a variety of food materials, including fruits and vegetables, flour products and meat products, etc. By adjusting the printing additives and sterilization conditions, it can meet the printing needs of different food raw materials, broaden the application scope of food 3D printing, and further promote the widespread application of food 3D printing technology.

[0032] 5) Reduce maintenance costs and save time: Existing food 3D printing feeding devices are mostly reused, and the cleaning and maintenance process is complicated. The disposable feeding device of the present invention avoids the cumbersome steps of cleaning and disinfection, and reduces the equipment maintenance cost and time.

[0033] 6) Improve user experience: The disposable feeding device of the present invention is simple and easy to use. Users only need to cut the nozzle diameter to a suitable size and add the material to the 3D printer barrel. This design lowers the threshold for using food 3D printing, making it easy for ordinary users to get started and improving user experience.

[0034] 7) Promote industry development: The present invention provides new ideas and solutions for the development of food 3D printing technology, filling the gap in the design of disposable feeding devices in the field of food 3D printing. The present invention is expected to promote the widespread application of food 3D printing technology in the fields of catering, food processing, and home kitchens, and promote the innovative development of the food 3D printing manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of a disposable food 3D printing feeding device according to the present invention.

[0036] Figure 2 Example 1 Rheological properties of the gel sample, wherein A is the viscosity curve of the gel sample, B is the storage modulus and loss modulus (G'&G") of the gel sample, C is the minimum flow point of the gel sample, and D is the creep curve of the gel sample.

[0037] Figure 3 Example 1 printing effect diagram.

[0038] In the figure: 1 barrel; 2 bonding point; 3 filling port; 4 nozzle cutting point; 5 nozzle device. DETAILED DESCRIPTION

[0039] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0040] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0041] A disposable food 3D printing feeding device comprises a barrel 1 and a printing nozzle 5. Between the barrel 1 and the printing nozzle 5 is a bonding portion 2, the rear end of the bonding portion 2 of the printing nozzle 5 is a filling port 3, and the lower end of the printing nozzle 5 is a nozzle cutting portion 4, which can cut the outlet diameter of the printing nozzle 5 as needed. The barrel body of the barrel 1 is a telescopic structure with a sawtooth-shaped axial cross section; the barrel 1 has a diameter of 30 mm and a capacity of 200 ml. The barrel 1 is made of soft modified polylactic acid Soft PLA material. The nozzle cutting portion 4 is set to different specifications, and the nozzle outlet diameters are 1.2 mm, 0.8 mm and 0.6 mm from top to bottom, respectively. The marking line is cut according to practical conditions to select the nozzle outlet diameter. The printing nozzle 5 uses polyphenylsulfone PPSU material.

[0042] Example 1

[0043] The embodiment of the present invention provides a disposable food 3D printing feeding device and a sterilization method, and the specific steps and methods are as follows:

[0044] 200 g of carrot puree was mixed with 12 g of potato starch, 6 g of tapioca starch and 4 g of pectin. The mixture was mixed with 100 ml of deionized water, filtered through a 100-mesh sieve and stirred evenly, and then placed in a heating container and heated and stirred at 85° C. for 10 minutes for gelatinization treatment to fully gelatinize the starch and form a uniform gelatinous substance.

[0045] After gelatinization is completed, cool to room temperature and process the gelatinized gel through a high-pressure homogenizer (pressure 120MPa) to ensure that the gel has good rheological properties and printability. Fill the treated carrot puree gel into the barrel 1, and use chitosan-citric acid composite adhesive to bond the barrel 1 to the nozzle device 5 to ensure sealing. Place the bonded feeding device in a microwave sterilization device, set the microwave power to 800W, and the sterilization time to 4 minutes to complete the entire sterilization process. During the microwave sterilization process, the internal temperature of the equipment is controlled at 75°C to ensure the sterilization effect while avoiding excessive heating to damage the rose pollen components.

[0046] After sterilization and storage for 3 days, use it after selecting a 0.8mm nozzle diameter, cutting its score line, and loading the feeding device into the barrel of the food 3D printer. The 3D printer software usage method is set to a nozzle diameter of 0.8mm, an extrusion ratio of 1.1, a retraction distance of 1mm, a retraction speed of 30mm, a layer height of 0.8mm, and a printing speed of 25mm / s. The carrot puree gel sample is successfully extruded and stacked. After use, take out the feeding device and discard it.

[0047] Example 2

[0048] The embodiment of the present invention provides a disposable food 3D printing feeding device and a sterilization method, and the specific steps and methods are as follows:

[0049] 1000g of surimi was mixed with 30g of salt, 13g of xanthan gum, 26g of guar gum and 15g of modified cassava starch. 255ml of deionized water was added and stirred evenly. After filtering through an 80-mesh sieve, the mixture was placed in a heating container and heated and stirred at 80°C for 12 minutes for gelatinization treatment to fully gelatinize the starch and form a uniform gelatinous substance.

[0050] After gelatinization is completed, cool to room temperature and manually stir the gelatinized gel for 15 minutes to ensure that the gel has good rheological properties and printability. Fill the processed fish paste gel into the barrel 1, and use natural rubber-based hot melt adhesive to bond the barrel 1 to the nozzle device 5 to ensure sealing. Put the bonded feeding device into the radio frequency sterilization equipment, set the radio frequency frequency to 27.12MHz, the power to 1500W, the plate spacing to 10cm, the hot air temperature to 55℃, and perform sterilization for 6 minutes to complete the entire sterilization process.

[0051] After sterilization and storage for 3 days, use it after selecting a 0.6mm nozzle diameter, cutting its score line, and loading the feeding device into the barrel of the food 3D printer. The 3D printer software usage method is set to a nozzle diameter of 0.6mm, an extrusion ratio of 1.0, a retraction distance of 1mm, a retraction speed of 30mm / s, a layer height of 0.6mm, and a printing speed of 30mm / s. The surimi gel sample is successfully extruded and stacked. After use, take out the feeding device and discard it.

[0052] Example 3

[0053] The embodiment of the present invention provides a disposable food 3D printing feeding device and a sterilization method, and the specific steps and methods are as follows:

[0054] 500g pea protein powder is mixed with 30g tapioca starch, 20g carrageenan and 6g konjac gum. According to the viscosity of the mixture, 230ml deionized water is added, stirred, and after filtering through a 120 mesh screen, a uniform protein gel is obtained. The filtered protein gel is stirred for 5 minutes by a high-speed stirrer to ensure that the gel has good rheological properties and printability. The processed protein gel is filled into the barrel 1, and the barrel 1 is bonded to the nozzle device 5 using a natural rubber-based hot melt adhesive to ensure sealing.

[0055] Put the bonded feeding device into the vacuum packaging machine, evacuate to an absolute pressure of 0.05MPa, and then seal the package. Put the sealed feeding device into the temperature and pressure sterilization equipment, set the sterilization temperature to 80℃, the pressure to 600MPa, and the sterilization time to 3 minutes to complete the entire sterilization process.

[0056] After sterilization, store it for 5 days before use. Select a 1.2mm nozzle diameter, cut its score line, and load the feeding device into the food 3D printer barrel. The 3D printer software usage method is set to a nozzle diameter of 1.2mm, an extrusion ratio of 1.0, a retraction distance of 1.2mm, a retraction speed of 35mm / s, a layer height of 1.2mm, and a printing speed of 30mm / s. The pea protein gel sample is successfully extruded and stacked, and the product quality is good. After use, take out the feeding device and discard it.

[0057] Example 4

[0058] The embodiment of the present invention provides a disposable food 3D printing feeding device and a microwave sterilization method, and the specific steps and methods are as follows:

[0059] Mix 300g of dark red double rose pollen with 38.5g of pectin. According to the viscosity of the mixture, add 940ml of deionized water and stir evenly. After filtering through an 80-mesh sieve, a uniform rose pollen reconstituted gel sample is obtained. Stir the filtered rose pollen reconstituted gel with a high-speed stirrer for 5 minutes to ensure that the gel has good rheological properties and printability. Fill the treated rose pollen reconstituted gel into the barrel 1, and use a natural rubber-based hot melt adhesive to bond the barrel 1 to the nozzle device 5 to ensure sealing.

[0060] Put the glued feeding device into the pasteurization equipment and process it at 85 °C for 10 minutes to complete sterilization. After sterilization, use it immediately after cooling to room temperature. Select a nozzle diameter of 1.2 mm, cut its scoring line, and install the feeding device into the food 3D printer cartridge. Set the 3D printer software usage method to a nozzle diameter of 1.2 mm, an extrusion ratio of 1.15, a retraction distance of 1 mm, a retraction speed of 30 mm / s, a layer height of 1.2 mm, and a printing speed of 25 mm / s. The rose pollen recombinant gel sample is smoothly extruded and stacked into shape, and the product has good quality and has the unique aroma of rose pollen. After use, take out the feeding device and discard it.

[0061] Example 5

[0062] An embodiment of the present invention provides a disposable food 3D printing feeding device and a microwave sterilization method. The specific steps and methods are as follows:

[0063] Mix 300 g of bee pupa powder evenly with 25 g of tapioca starch and 20 g of xanthan gum. According to the viscosity of the mixture, add 260 ml of deionized water and stir evenly. After filtering through a 100-mesh sieve, a uniform insect protein gel is obtained. Stir the filtered insect protein gel with a high-speed stirrer for 5 minutes to ensure that the gel has good rheological properties and printability. Fill the processed insect protein gel into barrel 1, and use natural rubber-based hot melt adhesive to bond barrel 1 and nozzle device 5 to ensure tightness.

[0064] Put the glued feeding device into the pasteurization equipment and process it at 75 °C for 15 minutes to complete sterilization. Store it for 1 day after sterilization before use. Select a nozzle diameter of 0.6 mm, cut its scoring line, and install the feeding device into the food 3D printer cartridge. Set the 3D printer software usage method to a nozzle diameter of 0.6 mm, an extrusion ratio of 1.2, a retraction distance of 1.0 mm, a retraction speed of 30 mm / s, a layer height of 0.6 mm, and a printing speed of 40 mm / s. The insect protein gel sample is smoothly extruded and stacked into shape, and the product has good quality and has the unique high nutritional value and good taste of insect protein. After use, take out the feeding device and discard it.

[0065] Application Example 1

[0066] Conduct a 3D printing experiment on the rose recombinant gel sample prepared in Example 4. Different types of printing models were used in this experiment to comprehensively evaluate the performance of the printing material. The cylindrical hollow model can intuitively reflect the support performance of the printing material, and the "field" character model reflects the accuracy of the printing material.

[0067] As Figure 3As shown, the hollow cylinder model can stand stably after printing, the extruded lines are stable, and a solid and uniform foundation structure can be formed. Each gel sample can successfully print a relatively intact model structure when printing the "field" character model. There are no obvious differences in the printing test results on the 0th day, 2nd day, 4th day, 6th day, and 8th day, thus proving that the feeding device used in the present invention has little difference in printing effect after short-term storage after sterilization.

[0068] Application Example 2

[0069] The rheological properties of the recombinant gel sample prepared in Example 4 were analyzed. As Figure 2 shown, Figure 2 A in it is the viscosity curve of the gel sample, Figure 2 B in it is the storage modulus and loss modulus (G’&G”) of the gel sample, Figure 2 C in it is the minimum flow point of the gel sample, Figure 2 D in it is the creep curve of the gel sample.

[0070] Generally, viscosity is considered an important index to evaluate whether a gel can be extruded smoothly. The viscosity curve can intuitively reflect whether the gel is suitable for food 3D printing. As Figure 2 shown in A in it, the viscosity of the sample after sterilization treatment and storage for 7 days is higher than that of the non-sterilized sample. The viscosity curve shows an obvious shear thinning phenomenon, that is, under the action of shear force, the viscosity will decrease significantly. This indicates that the sterilized sample has good fluidity and can better adapt to the flow requirements during the 3D printing process, thereby improving the printing effect and quality.

[0071] The storage modulus (G’) describes the solid-like behavior of the sample and represents the elastic part in the viscoelastic behavior, that is, the recovery ability of the sample after removing the external force. The loss modulus (G”) describes the liquid-like behavior of the sample and represents the viscous part in the viscoelastic behavior. As Figure 2 shown in B in it, as the angular frequency increases, the G’ and G” of the sample increase, and the structural strength of the sample is enhanced.

[0072] The minimum flow stress directly affects the extrusion efficiency. A higher minimum flow stress means that a greater pressure needs to be applied to make the sample extrude smoothly from the nozzle. As Figure 2 shown in C in it, the minimum flow stress of the sample becomes higher, so its support performance becomes stronger.

[0073] Creep is a time-dependent deformation under a constant stress and can be used to evaluate the anti-deformation ability of the printed sample. As Figure 2 shown in D in it, the strain of the sample after sterilization for 7 days is smaller than that of the non-sterilized sample. The anti-deformation ability and rigidity of this sample are improved after sterilization.

Claims

1. A disposable food 3D printing feeding device, characterized in that: The invention comprises a material barrel (1) and a printing nozzle (5); a bonding portion (2) is provided between the material barrel (1) and the printing nozzle (5); a rear end of the bonding portion (2) of the printing nozzle (5) is a filling port (3); and a lower end of the printing nozzle (5) is a nozzle cutting portion (4), which can cut the outlet diameter of the printing nozzle (5) according to needs.

2. A disposable food 3D printing feeding device according to claim 1, characterized in that: The barrel body of the barrel (1) is a telescopic structure with a sawtooth shape in the axial cross section.

3. A disposable food 3D printing feeding device according to claim 1, characterized in that: The barrel (1) has a diameter of 30 mm and a capacity of 200 ml.

4. A disposable food 3D printing feeding device according to claim 1, characterized in that: The material of the barrel (1) is soft modified polylactic acid Soft PLA material.

5. A disposable food 3D printing feeding device according to claim 1, characterized in that: The nozzle cutting part (4) is set with different specifications, and the nozzle outlet diameters are 1.2mm, 0.8mm and 0.6mm from top to bottom. The cutting line is selected according to practical conditions to select the nozzle outlet diameter.

6. A disposable food 3D printing feeding device according to claim 1, characterized in that: The printing nozzle (5) is made of polyphenylsulfone (PPSU) material.

7. A method for sterilizing a disposable food 3D printing feeding device according to any one of claims 1 to 6, characterized in that: The steps include: S1, mixing printing materials and printing aids to prepare a gel, and adding the gel to the barrel (1) after homogenization; S2, using a chitosan-citric acid composite adhesive to assist in bonding the barrel (1) and the printing nozzle (5) after adding the material; S3, sterilizing the sealed feeding device; S4, when in use, cutting the required printing nozzle diameter at the nozzle cutting portion (4) and then installing it into the printer for use; S5, after use, remove and discard the feeding device.

8. A sterilization method for a disposable food 3D printing feeding device according to claim 7, characterized in that: In step S1, the printing aids include thickeners, proteins, carbohydrates and inorganic salts; the powder material is filtered through a sieve to ensure the maximum particle size, and the material mixture powder is 60-120 mesh; in step S1, the gel is homogenized by manual stirring, high-speed stirring, ultrasonic vibration or high-pressure homogenization to make the material viscosity reach 10 2 -10 8 mPa·s.

9. The sterilization method of a disposable food 3D printing feeding device according to claim 7, characterized in that: In the step S3, the sterilization method is pasteurization, microwave sterilization, radio frequency sterilization or temperature and pressure sterilization; in the step S3, the sterilization conditions are: pasteurization: temperature 60°C-85°C, time 5min-30min, microwave sterilization: temperature 70°C-100°C, time 30s-5min, power 400w-4000w; radio frequency sterilization: frequency 27.12MHz, power 1500W, plate spacing 10-12cm, hot air temperature 55°C-75°C, time 5min-10min, temperature and pressure sterilization: pressure 600MPa, time 2min-5min, temperature 50°C-85°C.

10. The sterilization method of a disposable food 3D printing feeding device according to claim 7, characterized in that: The design of the disposable food 3D printing feeding device is suitable for a variety of food materials, including but not limited to fruits and vegetables, pasta products and meat products.

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