A method for hot stamping zongzi leaves

Abstract

This invention belongs to the field of zongzi leaf processing and provides a method for hot stamping zongzi leaves, including the following steps: making a mold; preparing zongzi leaves; washing zongzi leaves; drying zongzi leaves on one side; preparing for hot stamping; hot stamping pattern; inspection and sieving; processing zongzi leaves; drying zongzi leaves. This invention uses a pressing machine to drive a convex mold to press down on the sun-facing side of the zongzi leaf for hot stamping, causing local carbonization of the sun-facing side of the zongzi leaf with a pattern corresponding to the convex mold, leaving a corresponding pattern on the zongzi leaf. Zongzi leaves processed by this invention can effectively mark the trademarks and various markings of the wrapped zongzi after the original production process, making the zongzi highly recognizable and preventing these markings from being easily altered.

Description

Technical Field

[0001] This invention belongs to the field of zongzi leaf processing, specifically a method for hot stamping zongzi leaves. Background Technology

[0002] Zongzi, a type of rice dumpling made by wrapping glutinous rice in bamboo leaves and cooking it, is one of my country's traditional festive foods. As one of the traditional foods with the deepest historical and cultural heritage in China, zongzi has spread far and wide. The custom of eating zongzi during the Dragon Boat Festival has been popular in China for thousands of years and has also spread to Korea, Japan, and Southeast Asian countries.

[0003] The existing zongzi are usually made by hand-wrapping glutinous rice and fillings in bamboo leaves into a specific shape, and then steaming them at high temperature and pressure for about an hour and keeping them in the pot for another hour before taking them out of the pot.

[0004] Currently, the materials used for wrapping zongzi (sticky rice dumplings) are mostly leaves from a plant called bamboo. This invention also mainly targets this type of leaf and refers to it as zongzi leaf.

[0005] Since the leaves of the bamboo plant are used for making zongzi, it is currently impossible to print various markings on their surface using ordinary printing. In addition, since the leaves of the zongzi come into direct contact with food and are subjected to high temperature, high pressure and long-term steaming, the ink used for printing markings is easily affected by high temperature, high pressure and long time, which can decompose into unsafe substances, contaminating the zongzi and affecting food safety. Therefore, currently, there are no trademarks, varieties, or other markings directly printed on the bamboo leaves when wrapping zongzi. A small number of zongzi can only be identified by using a tag similar to a clothing tag, which is attached to the outside of the wrapping zongzi with a thread. The inside of this tag is a piece of paper printed with trademarks, varieties, etc., and it is sealed with plastic film to form a rectangular tag about 20mm wide and 50mm long. This tag is often steamed at high temperature and pressure for a long time along with the wrapped zongzi. Putting aside whether the high temperature, high pressure, and long time of steaming will affect the food safety of the zongzi, the production cost of the tag and the additional cost of wrapping the zongzi alone exceed the cost of the bamboo leaves needed to wrap the zongzi. Therefore, the method of using tags to identify zongzi is rarely used unless the customer specifically requests it.

[0006] Most zongzi on the market do not have trademarks or variety markings. Consumers need to go to specialty stores or ask the staff to introduce the manufacturers of the zongzi and use colored lines to distinguish the varieties of zongzi. However, consumers cannot directly distinguish whether the zongzi they buy are genuine, high-quality brands and varieties, which to some extent leads to the loss of consumers' interests.

[0007] To address this issue, those skilled in the art have proposed a hot stamping method for zongzi leaves to solve the problems raised in the background art. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a hot stamping method for zongzi leaves, which solves the problem that existing zongzi leaves used for wrapping zongzi lack identification marks such as trademarks and varieties, making it impossible to distinguish between different brands, varieties, and specifications.

[0009] A method for hot stamping zongzi leaves includes the following steps:

[0010] S1, Mold making: Make metal convex molds with corresponding patterns as needed. The metal convex molds are convex text molds or graphic molds for trademarks, product varieties, etc.

[0011] S2, Prepare the bamboo leaves: Select the leaves from the bamboo plant and call them bamboo leaves. Choose bamboo leaves that are free of insect holes, intact and undamaged. At the same time, you can remove bamboo leaves with yellowed leaves. Select bamboo leaves with long leaves, large leaf surface and bright green color for later use.

[0012] S3, Cleaning of Zongzi Leaves: Use a zongzi leaf cleaning machine to clean the zongzi leaves. After cleaning, soak or rinse the zongzi leaves with clean water 2-3 times.

[0013] S4, Single-sided drying of zongzi leaves: After rinsing, lay the zongzi leaves with the sun-facing side facing up on the clean conveyor belt surface. The drying device installed above the conveyor belt dries the sun-facing side of the zongzi leaves for 5-10 minutes, so that the moisture content of the bottom surface of the zongzi leaves is kept at 60-70% and the moisture content of the sun-facing side of the zongzi leaves is kept at more than 30%.

[0014] Because the drying device dries the sun-facing side of the bamboo leaves directly, the humidity of the sun-facing side and the bottom side are different, which effectively prepares the leaves for subsequent hot stamping.

[0015] S5, Hot stamping preparation: Install the convex die on the heat-conducting base plate of the molding machine, and heat the convex die through the molding machine at a temperature of 150℃-300℃;

[0016] The molding machine heats the convex mold, raising its temperature to between 150℃ and 300℃. This temperature can be adjusted according to the thickness of the bamboo leaves.

[0017] S6, Hot stamping pattern: The bamboo leaf is conveyed to the bottom of the convex mold, pressed for 1-5 seconds, with a pressure of 10-30Kg, and the bamboo leaf is discharged by the conveyor belt to complete the hot stamping;

[0018] S7, Inspection and Screening: Inspect the quality and clarity of the hot stamping pattern and remove defective products;

[0019] S8, Processing the bamboo leaves: Soak the bamboo leaves in hot water, heating the water to boiling to soften them;

[0020] S9, Drying the bamboo leaves: After the bamboo leaves are completely dry, tie them together and package them.

[0021] S10, Complete: Repeat the above steps until all the patterns on the bamboo leaves are completed.

[0022] The hot stamping process is simple and inexpensive. It does not change or add to the original actions of manually wrapping zongzi, thus incurring new labor costs. The increased cost in the production process of zongzi by this method is almost negligible. Moreover, the shape of the stamped zongzi leaves will not change even after high temperature, high pressure and long-term steaming. Furthermore, no factors that affect food hygiene and safety will be generated during the high temperature, high pressure and long-term steaming process, achieving a highly efficient and safe effect.

[0023] Preferably, in step S4, the drying device dries the sun-facing side of the zongzi leaves for 6-8 minutes, and the drying device consists of a drying lamp and a fan.

[0024] Preferably, in step S5, the convex mold is made of copper.

[0025] Preferably, in step S7, if carbonization occurs at the edge of the hot stamping pattern, the hot stamping pattern is too shallow, or the hot stamping pattern reaches the reverse side of the bamboo leaf, the bamboo leaf is judged to be a defective product.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention uses a molding machine to press a convex mold onto the sun-facing side of the zongzi leaf for hot stamping. This causes carbonization of the sun-facing side of the zongzi leaf, which corresponds to the pattern of the convex mold, leaving a pattern on the zongzi leaf. Zongzi leaves treated by this invention can be effectively marked with trademarks and various other markings on the wrapped zongzi after the original production process, making the zongzi highly recognizable and preventing these markings from being easily altered.

[0028] Because the humidity of the sun-facing side and the bottom side is different, after the mark is formed, the humidity of the bamboo leaves at the bottom of the mark is higher than that at the surface of the mark. This effectively hinders the continuous carbonization of the mark under high temperature, effectively avoids the hot stamping being too deep or the edge of the mark being easy to carbonize, and greatly improves the yield of hot stamping products. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the method flow of the present invention; Detailed Implementation

[0030] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0031] Example: As attached Figure 1 As shown: This invention provides a method for hot stamping on zongzi leaves, including the following steps:

[0032] S1, Mold making: Make a metal convex mold with the corresponding pattern as needed;

[0033] S2, Prepare the bamboo leaves: Select the leaves from the bamboo plant and call them bamboo leaves. Choose bamboo leaves that are free of insect holes, intact and undamaged. At the same time, you can remove bamboo leaves with yellowed leaves. Select bamboo leaves with long leaves, large leaf surface and bright green color for later use.

[0034] S3, Cleaning of Zongzi Leaves: Use a zongzi leaf cleaning machine to clean the zongzi leaves. After cleaning, soak or rinse the zongzi leaves with clean water 2-3 times.

[0035] S4, Single-sided drying of zongzi leaves: After rinsing, lay the zongzi leaves with the sun-facing side facing up on the clean conveyor belt surface. The drying device installed above the conveyor belt dries the sun-facing side of the zongzi leaves for 5-10 minutes, so that the moisture content of the bottom surface of the zongzi leaves is kept at 60-70% and the moisture content of the sun-facing side of the zongzi leaves is kept at more than 30%.

[0036] S401, the drying device dries the sun-facing side of the zongzi leaves for 6-8 minutes, and the drying device is a drying lamp combined with a fan;

[0037] Because the drying device dries the sun-facing side of the bamboo leaves directly, the bottom side of the bamboo leaves is in contact with the conveyor belt, so the drying efficiency of the bottom side is much lower than that of the sun-facing side. This results in inconsistent humidity between the sun-facing side and the bottom side, and the humidity increases gradually from the sun-facing side to the bottom side, which effectively prepares the leaves for subsequent hot stamping.

[0038] S5, Hot stamping preparation: Install the convex mold on the heat-conducting base plate of the molding machine, and heat the convex mold through the molding machine. The heating temperature is 150℃-300℃. The convex mold is made of copper.

[0039] The molding machine heats the convex mold, raising its temperature to between 150℃ and 300℃. This temperature can be adjusted according to the thickness of the bamboo leaves.

[0040] S6, Hot stamping pattern: The bamboo leaf is conveyed to the bottom of the convex mold, pressed for 1-5 seconds, with a pressure of 10-30Kg, and the bamboo leaf is discharged by the conveyor belt to complete the hot stamping;

[0041] The molding machine drives the convex mold to press down onto the sun-facing side of the zongzi leaf for hot stamping, causing carbonization of the sun-facing side of the zongzi leaf with a pattern corresponding to the convex mold, leaving the corresponding pattern on the zongzi leaf. After the zongzi leaf is processed by the present invention, it can effectively mark the trademark and various other marks of the wrapped zongzi after the original production process, so that the zongzi has a high degree of recognition and these marks cannot be easily changed.

[0042] Furthermore, due to the difference in humidity between the sun-facing side and the bottom side, the sun-facing side has lower humidity after drying, making it easier to carbonize and form a mark during the hot stamping process. After the mark is formed, due to the high humidity on the bottom side of the bamboo leaf, the humidity gradually increases as the protruding part of the convex mold sinks into the bamboo leaf. After the mark is formed, the humidity of the bamboo leaf at the bottom of the stamping pit is higher than that at the surface of the mark, which effectively hinders the continuous carbonization of the mark at high temperature. This effectively avoids the hot stamping being too deep or the edge of the mark being easy to carbonize, and greatly improves the yield of hot stamping products.

[0043] S7, Inspection and Screening: Inspect the quality and clarity of the hot stamping pattern and remove defective products;

[0044] In S701, if carbonization occurs at the edge of the hot stamping pattern, the hot stamping pattern is too light, or the hot stamping pattern reaches the reverse side of the bamboo leaf, the bamboo leaf is judged to be a defective product.

[0045] S8, Processing the bamboo leaves: Soak the bamboo leaves in hot water, heating the water to boiling to soften them;

[0046] After heating and boiling the bamboo leaves in step S8, the bamboo leaves can be shaped and the carbonized areas of the hot stamping can be effectively cleaned, preventing carbonized debris from getting into the plastic packaging after the rice dumplings are packaged, which would cause changes in the flavor of the rice dumplings.

[0047] S9, Drying the bamboo leaves: After the bamboo leaves are completely dry, tie them together and package them.

[0048] S10, Complete: Repeat the above steps until all the patterns on the bamboo leaves are completed.

[0049] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for hot stamping on zongzi leaves, characterized in that, Includes the following steps: S1. Mold making: Make metal convex molds with corresponding patterns as needed; S2. Preparing bamboo leaves: Select bamboo leaves that are free of insect holes, intact and undamaged, while removing yellowed leaves. Choose bamboo leaves with long, large, and bright green leaves for later use; S3. Cleaning bamboo leaves: Use a bamboo leaf cleaning machine to clean the leaves. After cleaning, soak or rinse the leaves in clean water for 2-3 minutes. S4, Single-sided drying of bamboo leaves: Lay the washed bamboo leaves flat on the clean conveyor belt with the sun-facing side facing up. The drying device above the conveyor belt dries the sun-facing side of the bamboo leaves for 6-8 minutes. The drying device consists of a drying lamp and a fan, maintaining the moisture content of the bottom surface of the bamboo leaves at 60-70% and the moisture content of the sun-facing side at 30%. S5, Hot stamping preparation: Install the convex mold on the heat-conducting base plate of the pressing machine. Heat the convex mold using the pressing machine at a temperature of 150℃-300℃. S6, Hot stamping pattern: Convey the bamboo leaves to the bottom of the convex mold and press them for 1-5 minutes. S7, Inspection and Sorting: Check the quality and clarity of the hot-stamped pattern and remove defective products; S8, Processing the Zongzi Leaves: Soak the Zongzi Leaves in hot water and heat the water to boiling to soften them; S9, Drying the Zongzi Leaves: After the Zongzi Leaves are completely dry, tie them together for packaging; S10, Completion: Repeat the above steps until the pattern on all the Zongzi Leaves is completed.

2. The method for hot stamping zongzi leaves as described in claim 1, characterized in that: In step S5, the convex mold is made of copper.

3. The hot stamping method for zongzi leaves as described in claim 1, characterized in that: In step S7, if carbonization occurs at the edge of the hot stamping pattern, the hot stamping pattern is too shallow, or the hot stamping pattern reaches the reverse side of the bamboo leaf, the bamboo leaf is judged to be a defective product.

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