阅读说明：本技术 山核桃的加工方法 (Processing method of hickory nut ) 是由 邓杨勇 高军龙 田玮 李童 于 2020-05-13 设计创作，主要内容包括：本发明涉及一种山核桃的加工方法,包括以下步骤：提供山核桃干籽,将山核桃干籽于预设温度的水溶液中预处理后捞出静置,得到第一预制品,水溶液中溶解有抗氧化剂,抗氧化剂在水溶液中的质量百分含量为0.01％-0.05％；将第一预制品置于裂壳设备中进行裂壳加工,得到第二预制品；对第二预制品进行煮制、烘烤、入味处理、复烤以及冷却,得到成品山核桃。本发明将抗氧化剂溶解于水溶液中,并采用该水溶液在预设温度下对山核桃干籽进行预处理,可使得山核桃干籽的果壳与果仁具有弹性,从而,在裂壳加工时果壳不容易被砸碎脱落,果仁也不容易破裂,可保持果壳和果仁的完整；从而最终得到的山核桃容易剥壳,且果仁相对完整,食用便利性较好。(The invention relates to a processing method of hickory nuts, which comprises the following steps: providing dry pecan seeds, pretreating the dry pecan seeds in an aqueous solution at a preset temperature, taking out the seeds and standing the seeds to obtain a first prefabricated product, wherein an antioxidant is dissolved in the aqueous solution, and the mass percentage of the antioxidant in the aqueous solution is 0.01-0.05%; putting the first prefabricated product into shell cracking equipment for shell cracking processing to obtain a second prefabricated product; and boiling, baking, flavoring, re-baking and cooling the second prefabricated product to obtain a finished product of the hickory nut. The invention dissolves the antioxidant in the aqueous solution, and the aqueous solution is adopted to pretreat the dry pecan seeds at the preset temperature, so that the shells and the kernels of the dry pecan seeds have elasticity, and the shells are not easy to break and fall off during shell cracking processing, the kernels are not easy to break, and the integrity of the shells and the kernels can be kept; therefore, the pecans obtained finally are easy to peel, and the nuts are relatively complete and have better eating convenience.)

1. The processing method of the hickory nut is characterized by comprising the following steps:

providing dried pecan seeds, pretreating the dried pecan seeds in an aqueous solution at a preset temperature, taking out the pretreated pecan seeds and standing the pretreated pecan seeds to obtain a first prefabricated product, wherein an antioxidant is dissolved in the aqueous solution, and the mass percentage of the antioxidant in the aqueous solution is 0.01-0.05%;

placing the first prefabricated product in a shell cracking device for shell cracking processing to obtain a second prefabricated product;

and boiling, baking, flavoring, re-baking and cooling the second prefabricated product to obtain a finished product of the hickory nut.

2. The pecan processing method according to claim 1, wherein the antioxidant comprises the following components in percentage by mass: 37-45% of D-sodium erythorbate, 18-25% of tert-butyl hydroquinone, 6-13% of emulsifying dispersant, 2-6% of penetrating agent and the balance of pregelatinized starch.

3. The method for processing hickory nut according to claim 2, wherein the emulsifying dispersant comprises soybean lecithin.

4. The pecan processing method of claim 2, wherein the osmotic agent comprises potassium chloride.

5. The pecan processing method according to claim 1, wherein the preset temperature is 85-95 ℃, and the pretreatment time is 15-30 min.

6. The method for processing hickory nut according to claim 1, wherein the processing of hickory nut is performed by the following steps,

the process of cooking, baking, seasoning, redrying and cooling the second pre-product comprises:

putting the second prefabricated product into hot water with the temperature of 85-95 ℃ for boiling for 2-2.5 h, and then fishing out and draining to obtain a third prefabricated product;

baking the third prefabricated product at the temperature of 100-150 ℃ for 20-60 min to obtain a fourth prefabricated product;

immersing the fourth prefabricated product into the feed liquid for 3s-10s while the fourth prefabricated product is hot, fishing out and standing for 20min-60min to obtain a fifth prefabricated product;

and re-baking the fifth pre-product at the temperature of 135-160 ℃ for 50-75 min, and naturally cooling to obtain a finished product of the hickory nut.

7. The pecan processing method according to claim 6, wherein the fifth pre-product is re-baked by placing the fifth pre-product into a multi-layer louver oven having a plurality of layers of baking trays arranged in sequence from top to bottom, the fifth pre-product is first placed into the uppermost layer of baking tray and then sequentially placed into the lower layer of baking tray until being placed into the lowermost layer of baking tray, and the baking time of each layer of baking tray is 10-15 min.

8. The pecan processing method according to claim 1, wherein the shelling device comprises: the feeding hopper, the first material guide roller, the second material guide roller, the blanking plate, the shell cracking roller and the shell cracking hammer are arranged on the feeding hopper;

the first material guide roller and the second material guide roller are arranged below the feeding hopper in parallel, the first material guide roller is provided with a first material guide groove, the second material guide roller is provided with a second material guide groove, the first material guide roller and the second material guide roller can rotate in opposite directions, so that the notches of the first material guide groove and the second material guide groove are opposite to each other to accommodate the pecans in the first material guide groove and the second material guide groove, and when the first material guide roller and the second material guide roller rotate to be far away from the first material guide groove and the second material guide groove, the pecans fall out of the first material guide groove and the second material guide groove;

the lower material plate is obliquely arranged below the first material guide roller and the second material guide roller, the shell cracking roller is rotatably arranged at the lower end of the lower material plate, a shell cracking groove is formed in the shell cracking roller, the lower material plate guides the pecans into the shell cracking groove, and the shell cracking hammer is arranged above the shell cracking roller and can reciprocate relative to the shell cracking roller to hammer the pecans in the shell cracking groove.

9. The pecan processing method according to claim 8, wherein the number of the split grooves is plural, and the plurality of split grooves are arranged in a plurality of rows in the circumferential direction of the split roller; the discharging plate is provided with a partition plate, the partition plate divides the discharging plate into a plurality of discharging channels, and the discharging channels guide the pecans to different shell cracking grooves.

10. The pecan processing method according to claim 8, wherein the shell cracking device further comprises a first motor, a second motor and a third motor, the first motor is connected to the first guide roller to drive the first guide roller to rotate, the second motor is connected to the second guide roller to drive the second guide roller to rotate, and the third motor is connected to the shell cracking roller to drive the shell cracking roller to rotate.

Technical Field

The invention relates to the technical field of food processing, in particular to a processing method of hickory nuts.

Background

The walnut is one of four nuts in the world; chinese hickory nuts are rare varieties in the large category of walnuts, are unique in China, are mainly distributed in Tianmu mountains in China, are loved by Chinese people and are praised as 'rare fruit in thousands of years'. At present, with the upgrading of consumption and the demand of the national market, the future development direction of the hickory industry mainly focuses on the further improvement of the edible convenience of the hickory. However, the pecans with shells sold on the market at present are difficult to peel, or the shells are incomplete, the nuts are broken, and the eating convenience of the pecans needs to be further improved.

Disclosure of Invention

Therefore, the problem that the hickory nut is difficult to peel is needed to be solved, the processed hickory nut is easy to peel, the shell and the nut are relatively complete, and the edible convenience is very good.

The invention provides a processing method of hickory nuts, which comprises the following steps:

providing dried pecan seeds, pretreating the dried pecan seeds in an aqueous solution at a preset temperature, taking out the pretreated pecan seeds and standing the pretreated pecan seeds to obtain a first prefabricated product, wherein an antioxidant is dissolved in the aqueous solution, and the mass percentage of the antioxidant in the aqueous solution is 0.01-0.05%;

placing the first prefabricated product in a shell cracking device for shell cracking processing to obtain a second prefabricated product;

and boiling, baking, flavoring, re-baking and cooling the second prefabricated product to obtain a finished product of the hickory nut.

In one embodiment, the antioxidant comprises the following components in percentage by mass: 37-45% of D-sodium erythorbate, 18-25% of tert-butyl hydroquinone, 6-13% of emulsifying dispersant, 2-6% of penetrating agent and the balance of pregelatinized starch.

In one embodiment, the emulsifying dispersant comprises soy lecithin.

In one embodiment, the osmotic agent comprises potassium chloride.

In one embodiment, the preset temperature is 85-95 ℃, and the pretreatment time is 15-30 min.

In one embodiment, the cooking, baking, seasoning, re-baking and cooling of the second pre-product comprises:

putting the second prefabricated product into hot water with the temperature of 85-95 ℃ for boiling for 2-2.5 h, and then fishing out and draining to obtain a third prefabricated product;

baking the third prefabricated product at the temperature of 100-150 ℃ for 20-60 min to obtain a fourth prefabricated product;

immersing the fourth prefabricated product into the feed liquid for 3s-10s while the fourth prefabricated product is hot, fishing out and standing for 20min-60min to obtain a fifth prefabricated product;

and re-baking the fifth pre-product at the temperature of 135-160 ℃ for 50-75 min, and naturally cooling to obtain a finished product of the hickory nut.

In one embodiment, when the fifth prefabricated product is redried, the fifth prefabricated product is placed into a multi-layer louver oven, the multi-layer louver oven is provided with a plurality of layers of baking trays which are arranged from top to bottom in sequence, the fifth prefabricated product is firstly placed into the uppermost layer of baking tray and then is sequentially placed into the lower layer of baking tray until being placed into the lowermost layer of baking tray, and the baking time in each layer of baking tray is 10-15 min.

In one embodiment, the shelling device comprises: the feeding hopper, the first material guide roller, the second material guide roller, the blanking plate, the shell cracking roller and the shell cracking hammer are arranged on the feeding hopper;

the first material guide roller and the second material guide roller are arranged below the feeding hopper in parallel, the first material guide roller is provided with a first material guide groove, the second material guide roller is provided with a second material guide groove, the first material guide roller and the second material guide roller can rotate in opposite directions, so that the notches of the first material guide groove and the second material guide groove are opposite to each other to accommodate the pecans in the first material guide groove and the second material guide groove, and when the first material guide roller and the second material guide roller rotate to be far away from the first material guide groove and the second material guide groove, the pecans fall out of the first material guide groove and the second material guide groove;

the lower material plate is obliquely arranged below the first material guide roller and the second material guide roller, the shell cracking roller is rotatably arranged at the lower end of the lower material plate, a shell cracking groove is formed in the shell cracking roller, the lower material plate guides the pecans into the shell cracking groove, and the shell cracking hammer is arranged above the shell cracking roller and can reciprocate relative to the shell cracking roller to hammer the pecans in the shell cracking groove.

In one embodiment, the number of the split shell grooves is multiple, and the multiple split shell grooves are arranged in multiple rows along the circumferential direction of the split shell roller; the discharging plate is provided with a partition plate, the partition plate divides the discharging plate into a plurality of discharging channels, and the discharging channels guide the pecans to different shell cracking grooves.

In one embodiment, the shell cracking equipment further comprises a first motor, a second motor and a third motor, wherein the first motor is connected with the first material guiding roller to drive the first material guiding roller to rotate, the second motor is connected with the second material guiding roller to drive the second material guiding roller to rotate, and the third motor is connected with the shell cracking roller to drive the shell cracking roller to rotate.

According to the processing method of the hickory nut, the antioxidant is dissolved in the aqueous solution, and the aqueous solution is adopted to pretreat the dry hickory nut seeds at the preset temperature, so that shells and kernels of the dry hickory nut seeds can be softened, meanwhile, the kernels of the hickory nut are protected, the oxidation of grease of the hickory nut is delayed, and the shells and the kernels of the dry hickory nut seeds have elasticity. Therefore, the shell is not easy to break and fall off during the shell cracking process, the kernel is not easy to break, and the integrity of the shell and the kernel can be maintained. Therefore, the pecan obtained finally is easy to peel, and the kernel is relatively complete and has better eating convenience.

Drawings

FIG. 1 is a flow chart of a method of processing hickory nuts according to the present invention;

fig. 2 is a schematic structural diagram of an embodiment of a shell cracking device used in the processing method of the hickory nut of the present invention;

fig. 3 is a schematic view of a first material guiding roller and a second material guiding roller of the shell cracking device used in the processing method of the hickory nut of the invention;

fig. 4 is a schematic view of a blanking plate of an embodiment of a shell cracking device used in the processing method of the pecan;

fig. 5 is a schematic view of a shell cracking roller of an embodiment of the shell cracking device used in the processing method of the hickory nut of the invention.

Reference numerals: 1. a feeding hopper; 2. a first material guide roller; 21. a first material guide chute; 22. a first motor; 3. a second material guiding roller; 31. a second material guide chute; 32. a second motor; 4. a blanking plate; 41. a partition plate; 411. a blanking channel; 5. cracking a shell roller; 51. cracking the shell groove; 511. a protrusion; 52. a third motor; 6. a shell cracking hammer; 7. a material collecting plate; 100. hickory nuts.

Detailed Description

The processing method of the hickory nut provided by the invention will be further explained below.

Referring to fig. 1, the present invention provides a processing method of hickory nut, including the following steps:

s1, providing dried pecan seeds, pretreating the dried pecan seeds in an aqueous solution at a preset temperature, taking out the seeds, and standing the seeds to obtain a first prefabricated product. Wherein, the antioxidant is dissolved in the aqueous solution, and the mass percentage of the antioxidant in the aqueous solution is 0.01-0.05%.

And S2, placing the first prefabricated product in a shell cracking device for shell cracking processing to obtain a second prefabricated product.

S3, boiling, baking, flavoring, re-baking and cooling the second pre-product to obtain the finished hickory nut.

In the traditional hickory nut processing process, an antioxidant is usually added in the step of flavoring treatment, and the antioxidant and feed liquid permeate into nuts together to play a role in prolonging the quality guarantee period of the hickory nuts.

In the processing method of the hickory provided by the invention, the antioxidant is dissolved in the aqueous solution, and the aqueous solution is adopted to carry out the pretreatment of the step S1 on the dry hickory seeds at the preset temperature, so that shells and kernels of the dry hickory seeds can be softened, the hickory kernels are protected, the oxidation of grease of the hickory seeds is delayed, and the shells and kernels of the dry hickory seeds have elasticity. Therefore, the shell is not easy to break and fall off during the shell cracking process, the kernel is not easy to break, and the integrity of the shell and the kernel can be maintained. Therefore, the pecan obtained finally is easy to peel, the kernel is relatively complete, and the edible convenience and the experience are better.

Specifically, the antioxidant comprises the following components in percentage by mass: 37-45% of D-sodium erythorbate, 18-25% of tert-butyl hydroquinone, 6-13% of emulsifying dispersant, 2-6% of penetrating agent and the balance of pregelatinized starch.

The D-sodium erythorbate and the tert-butylhydroquinone are main antioxidant components, have a good antioxidant effect, and can effectively prolong the shelf life of the hickory nut. The emulsifying dispersant comprises soybean phospholipid, and the penetrating agent comprises potassium chloride. The soybean phospholipid is used as an emulsifying dispersant, and the potassium chloride is used as a penetrating agent, so that the D-sodium isoascorbate and the tert-butyl hydroquinone can be favorably permeated into the pecan nuts, the oxidation of the pecan grease is delayed, and the shelf life of the pecan is prolonged.

The preset temperature is 85-95 ℃, and the pretreatment time is 15-30 min. In the traditional hickory processing process, an antioxidant is usually added in the step of flavor treatment, but the time for immersing the hickory into the feed liquid in the step of flavor treatment is short (generally, a few seconds), the amount of the antioxidant penetrating into shells and kernels is small, and the quality guarantee period is not long enough. In the invention, the antioxidant is added in the pretreatment step before the cracking process, the preset temperature is 85-95 ℃, the pretreatment time is 15-30 min, and the time is longer, so that the antioxidant can be more fully permeated into the shells and the nuts, and the quality guarantee period of the hickory nuts can be prolonged.

When the antioxidant is dissolved in water, the antioxidant may be dissolved in 75% by volume of edible alcohol before being dissolved in water. The antioxidant is easily dissolved in the edible alcohol, so that the antioxidant is dissolved in the edible alcohol with the volume fraction of 75% and then dissolved in the water, the rapid dissolution of the antioxidant is facilitated, and the processing time can be shortened.

When the antioxidant is dissolved in the edible alcohol with the volume fraction of 75%, the edible alcohol is used in an amount which can immerse the antioxidant so that the antioxidant is dissolved in the edible alcohol, and the specific amount of the edible alcohol is not required.

Referring to fig. 2, the shelling device in step S2 includes: the feeding device comprises a feeding hopper 1, a first material guide roller 2, a second material guide roller 3, a discharging plate 4, a shell cracking roller 5 and a shell cracking hammer 6.

The first guide roller wheel 2 and the second guide roller wheel 3 are arranged below the feeding hopper 1 in parallel, the first guide roller wheel 2 is provided with a first guide chute 21, the second guide roller wheel 3 is provided with a second guide chute 31, the first guide roller wheel 2 and the second guide roller wheel 3 can rotate towards opposite directions, so that notches of the first guide chute 21 and the second guide chute 31 are opposite to each other to accommodate the pecans 100 in the first guide chute 21 and the second guide chute 31, and when the first guide roller wheel 2 and the second guide roller wheel 3 rotate to the first guide chute 21 and the second guide chute 31 to be far away from each other, the pecans 100 fall out of the first guide chute 21 and the second guide chute 31.

Lower flitch 4 slope sets up in first guide running roller 2 and second guide running roller 3 below, splits the lower extreme of flitch 4 rotationally to locate down flitch 5, splits to be equipped with on the shell running roller 5 and splits the shell groove 51, and lower flitch 4 guides hickory 100 to splitting in the shell groove 51, splits shell hammer 6 and locates and splits shell running roller 5 top and can split shell running roller 5 reciprocating motion relatively and beat the hickory 100 that splits in the shell groove 51.

The processing process of cracking the hickory 100 by the shell cracking equipment comprises the following steps: the hickory nuts 100 are loaded into the feeding hopper 1, and due to the action of gravity, the hickory nuts 100 fall between the first material guiding roller 2 and the second material guiding roller 3 from the bottom of the feeding hopper 1. Because the first material guide roller 2 is provided with the first material guide groove 21, the second material guide roller 3 is provided with the second material guide groove 31, the pecans 100 can fall into the groove formed by the first material guide groove 21 and the second material guide groove 31, the first material guide groove 21 and the second material guide groove 31 are separated from each other along with the rotation of the first material guide roller 2 and the second material guide roller 3, so that the pecans 100 fall onto the discharging plate 4, are conveyed to the shell cracking groove 51 through the discharging plate 4, and finally are beaten through the shell cracking hammer 6, so that the shell cracking processing of the pecans 100 is realized.

This shell equipment of splitting can convey a plurality of hickories 100 on splitting shell running roller 5 automatically and orderly through setting up first guide running roller 2, second guide running roller 3 and lower feed plate 4, splits the shell through splitting shell hammer 6 again, can realize mechanical automation and split the shell, has improved machining efficiency greatly to, the dynamics of beating of splitting shell hammer 6 is controllable, can guarantee that the shell process degree of splitting of hickory 100 is even, and the finished product quality is high. The shell cracking equipment is simple in structure and easy to operate, only the pecans 100 are required to be put into the feeding hopper 1, the shell cracking can be achieved through automatic control of the equipment, and the shell cracking process is very simple.

The splitting apparatus further comprises a first motor 22, a second motor 32 and a third motor 52. The first motor 22 is connected with the first material guiding roller 2 to drive the first material guiding roller 2 to rotate, the second motor 32 is connected with the second material guiding roller 3 to drive the second material guiding roller 3 to rotate, and the third motor 52 is connected with the shell cracking roller 5 to drive the shell cracking roller 5 to rotate. In this embodiment, the first material guiding roller 2 and the second material guiding roller 3 are both plastic rollers, and the shell cracking roller 5 is a high-carbon steel roller.

The shell cracking hammer 6 is a pneumatic shell cracking hammer, the shell cracking hammer 6 is connected with an air cylinder, and the shell cracking hammer 6 is controlled to reciprocate through the air cylinder. Therefore, the control mode of the shell cracking hammer 6 is simple, the operation is convenient, and the beating force of the shell cracking hammer 6 is easy to control. The shell cracking hammer 6 can be made of high-carbon steel, has good rigidity and is easy to crack the hickory 100 shells.

Further, the interval between the first guide roller wheel 2 and the second guide roller wheel 3 is adjustable, different intervals can be adjusted according to the size of the hickory nut 100, and when the first guide roller wheel 2 and the second guide roller wheel 3 are clamped by the hickory nut 100 or other foreign matters and cannot rotate, the hickory nut 100 or other foreign matters can be taken out by adjusting the interval between the first guide roller wheel 2 and the second guide roller wheel 3, and the maintenance is convenient.

The first material guide groove 21 and the second material guide groove 31 are both hemispherical grooves, the structure is simple, when the notches of the first material guide groove 21 and the second material guide groove 31 are opposite, a spherical groove is formed, and the whole pecan 100 can be accommodated.

In order to further improve the processing efficiency, in an embodiment, the number of the first material guide grooves 21 is plural, and the plural first material guide grooves 21 are arranged in plural rows along the circumferential direction of the first material guide roller 2. Accordingly, the number of the second guide chute 31 is plural, and the plural second guide chutes 31 are arranged in plural rows along the circumferential direction of the second guide roller 3. The arrangement of the plurality of rows of the first and second material guide grooves 21 and 31 ensures the continuity of conveying the pecans 100, thereby greatly improving the processing efficiency. The number and arrangement of the second material guide grooves 31 correspond to those of the first material guide grooves 21 one by one, so that when the first material guide rollers 2 and the second material guide rollers 3 rotate, the notches of the first material guide grooves 21 can correspond to those of the second material guide grooves 31 one by one.

Referring to fig. 3, in an embodiment, six first material guiding grooves 21 of the first material guiding roller 2 are arranged in a row, and correspondingly, six second material guiding grooves 31 of the second material guiding roller 3 are arranged in a row, so that when the first material guiding roller 2 and the second material guiding roller 3 rotate, six pecans 100 can simultaneously pass through the first material guiding roller 2 and the second material guiding roller 3 and fall onto the blanking plate 4, thereby greatly improving the processing efficiency. However, the number of rows of the first material guide chutes 21 and the second material guide chutes 31 and the number of the first material guide chutes 21 and the second material guide chutes 31 in each row are not limited in the present invention.

Referring to fig. 4, the separating plate 41 is disposed on the blanking plate 4, the separating plate 41 separates the blanking plate 4 into a plurality of blanking channels 411, and the blanking channels 411 guide the pecans 100 to different cracking grooves 51. The pecans 100 can be separated one by arranging the partition plates 41, so that the pecans can fall into different shell cracking grooves 51 respectively, and the shell cracking processing efficiency of the pecans 100 is greatly improved.

The number of the split case grooves 51 is plural, and the plurality of split case grooves 51 are arranged in plural rows in the circumferential direction of the split case roller 5. The multiple rows of shell cracking grooves 51 can greatly improve the processing efficiency. In this embodiment, the six split shell chutes 51 are arranged in a row, that is, the number of the split shell chutes 51 in each row corresponds to the number of the first material guiding chutes 21 in each row, so that the pecans 100 passing through the first material guiding roller 2 and the second material guiding roller 3 can be ensured to fall into the split shell chutes 51 one by one. However, the present invention is not limited to this, and the number of rows of the split grooves 51 and the number of the split grooves 51 in each row are not limited.

The shell cracking groove 51 is a hemispherical groove, the structure is simple, the hickory nut 100 is easy to place, and when the shell cracking roller 5 rotates for a certain angle, the hickory nut 100 is easy to fall out of the shell cracking groove 51.

Referring to fig. 5, further, the protrusions 511 are arranged in the cracking groove 51, and when the cracking hammer 6 beats the hickory 100, the protrusions 511 are beneficial to uniformly stress the periphery of the hickory 100, so that the hickory 100 is beneficial to uniformly crack, and the surface of the hickory 100 after the cracking processing is uniform. Further, the protrusion 511 may include a convex point, a convex rib, or both of the convex point and the convex rib. The structure of the convex points and the convex ribs is very simple, and the cracking of the hickory 100 is facilitated.

Further, shell equipment that splits still includes the aggregate board 7, and the slope of aggregate board 7 sets up in splitting shell running roller 5 below. The shell cracking roller 5 keeps rotating, so that the cracked hickory nut 100 shells automatically fall onto the material collecting plate 7, and the hickory nut 100 is conveniently collected. The pecans 100 processed by cracking shells can be directly collected by placing the collecting basket at the lower end of the collecting plate 7, which is very convenient.

In step S3, the steps of cooking, baking, seasoning, redrying, and cooling the second pre-product include:

s31, putting the second prefabricated product into hot water with the temperature of 85-95 ℃ to boil for 2-2.5 h, and then fishing out and draining to obtain a third prefabricated product. In the step, water is kept boiling all the time, water is supplemented continuously, the water level is kept unchanged, and the phenomenon that water is burnt out or the water cannot be fully removed due to small water amount is avoided.

S32, baking the third prefabricated product at the temperature of 100-150 ℃ for 20-60 min to obtain a fourth prefabricated product.

And S33, immersing the fourth prefabricated product into the feed liquid for 3S-10S while the fourth prefabricated product is hot, fishing out and standing for 20min-60min to obtain a fifth prefabricated product. The pecans are flavored by the impregnation of the feed liquid, and the pecans treated by the feed liquid can have various tastes such as original taste, cream taste, salt taste, caramel taste and the like, so that the pecans are richer in taste and can meet different requirements of consumers.

S34, re-baking the fifth pre-product at 135-160 ℃ for 50-75 min, and naturally cooling to obtain the finished hickory nut.

And when the fifth prefabricated product is re-baked, putting the fifth prefabricated product into a multi-layer louver oven, wherein the multi-layer louver oven is provided with a plurality of layers of baking trays which are arranged in sequence from top to bottom. And the fifth prefabricated product is firstly put into the baking tray on the uppermost layer and then successively put into the baking trays on the lower layers until the fifth prefabricated product is put into the baking tray on the lowermost layer, wherein the baking time in each layer of baking trays is 10-15 min. The temperature of the uppermost layer in the multi-layer louver drying oven is lower, the temperature is higher when going downwards, and the pecans are sequentially placed into the baking trays on different layers to be baked when being baked, so that the pecans are gradually heated, the pecans are fully dried, and the surface layers of the pecans are prevented from being baked.

When naturally cooling, the pecans can be naturally cooled in the environment with the temperature of 20-25 ℃ and the relative humidity of 40-60 percent.

Hereinafter, the processing method of the hickory nut will be further described by specific examples.