Manufacturing method of firework cylinder

Abstract

The invention discloses a manufacturing method of a firework cylinder. The method comprises the following steps: (1) adjusting the pH value of plant starch slurry to 10.5-10.6 by using a 2.5% sodium hydroxide solution, heating to 37-39 DEG C, adding sodium trimetaphosphate which is 0.1 time of the amount of the starch slurry, and maintaining reaction for 4 hours to obtain high-viscosity starch slurry; (2) pretreating plant fibers: soaking the plant fibers in a 10% sodium hydroxide solution for 20-60 minutes, washing the plant fibers to be neutral, and airing the plant fibers for later use; (3) adding the pretreated plant fiber, gypsum, glass fiber and bentonite into the high-viscosity starch slurry, and uniformly stirring to obtain a gelatinized mixture; and (4) filling the gelatinized mixture into a mold, heating, pressurizing, curing and molding, demolding, and taking out to obtain the finished firework cylinder. According to the method, plant starch slurry is treated to be subjected to cross-linking reaction, so that the viscosity and the swelling degree of starch can be increased, and corner breakage and cracking of the firework cylinder are avoided; meanwhile, high-temperature and high-pressure conditions are not needed in the batching process, so that the energy consumption is reduced, and the cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of fireworks, and in particular relates to a method for manufacturing a firework tube. Background Art

[0002] There are several problems with the traditional production of paper tubes for fireworks: 1. The manufacturing is completely dependent on manual labor. The manual production of the outer tube requires nine traditional processes, including paper cutting, rolling, gluing, cutting, bundling, drying, mud bottoming, tube assembly, and basin assembly. The traditional manufacturing process brings many problems such as safety, cost, and production capacity. The weather also affects the progress. 2. There are many auxiliary materials required, including glue, tape, rope, wire, wood strips, yellow cardboard, yellow mud, foam plastic and other materials. 3. The production proficiency affects the firing effect of the product. 4. If the paper tube is deformed, damp and other factors affect it, it will cause the tube to explode, low explosion or even duds. 5 According to traditional technology, the winding and basin assembly process of the outer tube of fireworks requires chemicals such as polyvinyl alcohol, methanol and hydrochloric acid, and this operation process is purely manual, which poses a huge threat to the health of the operators. Summary of the invention

[0003] In view of the above-mentioned current situation, the present invention aims to invent a method for manufacturing a firework tube with abundant raw material sources, simple process operation, cost saving, stable product quality and harmless production process.

[0004] The present invention provides a method for manufacturing a firework tube, comprising the following contents: 1. The method of making a firework tube is: 1) Adjust the pH value of plant starch slurry to 10.5-10.6 with 2.5% sodium hydroxide solution, raise the temperature to 37-39°C, add 0.1 times the amount of sodium trimetaphosphate of starch slurry, and maintain the reaction for 4 hours to obtain high viscosity starch slurry; 2) Plant fiber pretreatment: soak in 10% sodium hydroxide solution for 20-60 minutes, wash with water until neutral, and dry for later use; 3) adding the pretreated plant fiber, gypsum, glass fiber and bentonite to the high viscosity starch slurry in step 1), stirring evenly to obtain a gelatinized mixture; 4) The gelatinized mixture obtained in step 3) is placed into a mold, heated at 210-260° C. and pressurized at 5-10 MPa to solidify the mixture, and then removed from the mold to obtain a finished firework tube.

[0005] 2. The formula of the fireworks tube is: 15-20 parts by weight of plant starch slurry; 30-55 parts by weight of plant fiber; 10-15 parts by weight of gypsum; 5-8 parts by weight of glass fiber; 2-6 parts by weight of bentonite. The plant starch slurry is one or a mixture of cassava starch slurry, corn starch slurry, wheat starch slurry, and sweet potato starch slurry; the plant fiber is one or two of straw, corn cob, and rice husk; the mesh number of the glass fiber is 100-200 meshes.

[0006] Compared with the prior art, the present invention has the following beneficial effects: By processing the plant starch slurry to cause cross-linking reaction, the viscosity and swelling degree of the starch can be increased, thus avoiding chipping and cracking of the firework tube; at the same time, the mixing process does not require high temperature and high pressure conditions, thus reducing energy consumption and saving costs; adding glass fiber to the components effectively improves the heat resistance and stability of the firework tube. DETAILED DESCRIPTION

[0007] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Example 1

[0008] The pH value of cassava starch slurry was adjusted to 10.5 with 2.5% sodium hydroxide solution, and the temperature was raised to 37°C. Sodium trimetaphosphate 0.1 times the amount of starch slurry was added, and the reaction was maintained for 4 hours to obtain a high-viscosity starch slurry; plant fiber pretreatment: the straw was soaked in 10% sodium hydroxide solution for 20 minutes, washed with water until neutral, and dried for use; 55 parts by weight of pretreated straw, 15 parts by weight of gypsum, 5 parts by weight of glass fiber and 2 parts by weight of bentonite were added to the high-viscosity starch slurry, stirred evenly, and a gelatinized mixture was obtained; the obtained gelatinized mixture was loaded into a mold, heated at 210°C, pressurized at 5MPa for curing and molding, and then demolded and taken out to obtain a finished firework tube. Example 2

[0009] The pH value of wheat starch slurry was adjusted to 10.5 with 2.5% sodium hydroxide solution, and the temperature was raised to 38°C. 0.1 times the amount of sodium trimetaphosphate of the starch slurry was added, and the reaction was maintained for 4 hours to obtain a high-viscosity starch slurry; plant fiber pretreatment: corn cobs were soaked in 10% sodium hydroxide solution for 60 minutes, washed with water until neutral, and dried for use; 30 parts by weight of pretreated corn cobs, 10 parts by weight of gypsum, 8 parts by weight of glass fiber and 6 parts by weight of bentonite were added to the high-viscosity starch slurry, stirred evenly, and a gelatinized mixture was obtained; the obtained gelatinized mixture was loaded into a mold, heated at 260°C, pressurized at 10MPa for curing and molding, and then demolded to obtain a finished firework tube. Example 3

[0010] The pH value of corn starch slurry was adjusted to 10.6 with 2.5% sodium hydroxide solution, and the temperature was raised to 39°C. 0.1 times the amount of sodium trimetaphosphate of the starch slurry was added, and the reaction was maintained for 4 hours to obtain a high-viscosity starch slurry; plant fiber pretreatment: the husk was soaked in 10% sodium hydroxide solution for 40 minutes, washed with water until neutral, and dried for use; 45 parts by weight of pretreated husk, 12 parts by weight of gypsum, 6 parts by weight of glass fiber and 4 parts by weight of bentonite were added to the high-viscosity starch slurry, stirred evenly, and a gelatinized mixture was obtained; the obtained gelatinized mixture was loaded into a mold, heated at 240°C, pressurized at 8MPa for curing and molding, and then demolded and taken out to obtain a finished firework tube. Example 4

[0011] The pH value of the sweet potato starch slurry was adjusted to 10.6 with 2.5% sodium hydroxide solution, and the temperature was raised to 38°C. 0.1 times the amount of sodium trimetaphosphate of the starch slurry was added, and the reaction was maintained for 4 hours to obtain a high-viscosity starch slurry; plant fiber pretreatment: the straw was soaked in 10% sodium hydroxide solution for 25 minutes, washed with water until neutral, and dried for use; 35 parts by weight of the pretreated straw, 10 parts by weight of gypsum, 6 parts by weight of glass fiber and 5 parts by weight of bentonite were added to the high-viscosity starch slurry, stirred evenly, and a gelatinized mixture was obtained; the obtained gelatinized mixture was loaded into a mold, heated at 220°C, pressurized at 6MPa for curing and molding, and then demolded and taken out to obtain a finished firework tube.

[0012] Comparative Example 1 The raw materials used in the firework tube of this comparative example are basically the same as those used in the firework tube of Example 1, the main difference being that the starch slurry is untreated.

[0013] Comparative Example 2 The raw materials used in the firework tube of this comparative example are basically the same as those used in the firework tube of Example 1, the main difference being that after sodium trimetaphosphate is added, the reaction temperature is maintained at 50°C.

[0014] Comparative Example 3 The raw materials used in the firework tube of this comparative example are basically the same as those used in the firework tube of Example 1, and the main difference is that the mesh number of the glass fiber is 45-50 meshes.

[0015] Control group Select a commercially available firework tube with a size of 3.0 inches.

[0016] Performance Testing The fireworks tubes of Examples 1-4, Comparative Examples 1-3 and the control group were subjected to appearance inspection and compressive strength test. The experimental results are shown in Table 1: Table 1 Experimental results of Examples 1-4, Comparative Examples 1-3 and Control Group

[0017] As shown in Table 1, the pH value of the plant starch slurry is adjusted to 10.5-10.6 with 2.5% sodium hydroxide solution, and the temperature is raised to 37-39°C. 0.1 times the amount of sodium trimetaphosphate of the starch slurry is added, and the reaction is maintained for 4 hours. The quality and performance of the fireworks tube produced under the conditions of 100-120 mesh of glass fiber are the best.

Claims

1. A method for making a firework tube, characterized in that: The following steps are involved: 1) The pH value of the plant starch slurry is adjusted with 2.5% sodium hydroxide solution, and the temperature is raised at the same time. Sodium trimetaphosphate 0.1 times the amount of the starch slurry is added, and the reaction is maintained for 4 hours to obtain a high-viscosity starch slurry; 2) Plant fiber pretreatment: soak in 10% sodium hydroxide solution for 20-60 minutes, wash with water until neutral, and dry for later use; 3) adding the pretreated plant fiber, gypsum, glass fiber and bentonite to the high viscosity starch slurry in step 1), stirring evenly to obtain a gelatinized mixture; 4) The gelatinized mixture obtained in step 3) is placed into a mold, heated and pressurized to solidify and shape it, and then demoulded and taken out to obtain a finished firework tube.

2. The method for making a firework tube according to claim 1, characterized in that: Step 1) The pH value range is 10.5-10.6 and the temperature is 37-39°C.

3. The method for making a firework tube according to claim 1, characterized in that: Step 4) The temperature is 210-260°C and the pressure is 5-10 MPa.

4. The method for making a firework tube according to claim 1, characterized in that: Includes the following components: 15-20 parts by weight of plant starch slurry; 30-55 parts by weight of plant fiber; 10-15 parts by weight of gypsum; 5-8 parts by weight of glass fiber; 2-6 parts by weight of bentonite.

5. The method for making a firework tube according to claim 1, characterized in that: The plant starch slurry is one or a mixture of cassava starch slurry, corn starch slurry, wheat starch slurry and sweet potato starch slurry.

6. The method for making a firework tube according to claim 1, characterized in that: The plant fiber is one or two of straw, corn cob and husk.

7. The method for making a firework tube according to claim 1, characterized in that: The mesh number of the glass fiber is 100-120 meshes.

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