JP2021145737A - Bamboo straw and method for manufacturing the same - Google Patents

Abstract

To provide a method for manufacturing a bamboo straw in which a natural bamboo can be used as one solution to a waste plastic problem, and which can be used very safely without using preservative agent and so on.SOLUTION: The present invention includes: a cutting step 100 for cutting the bamboo by 150-200 mm; a heat sterilizing step 200 for thermally sterilizing the cut bamboo in a heat furnace; a hollowing step 300 for hollowing the sterilized bamboo core; an outer shaving step 400 for shaving an outer periphery of the bamboo to form a uniform outer diameter; an inside/outside polishing step 500 for polishing an inside and outside of the cylindrical body; a bamboo powder removing step 600 for removing the bamboo powder attached to the cylindrical body; and a drying step 700 for drying by irradiating ultrasonic wave and ultraviolet ray to the cylindrical body.SELECTED DRAWING: Figure 5

Description

The present invention relates to a bamboo straw made of a natural material that does not use any chemicals such as preservatives, and relates to a bamboo straw capable of suppressing the generation of mold and a method for producing the same.

Bamboo products made from natural materials are treated with chemicals and pesticides in order to prevent the growth of mold and kill the eggs laid on the bamboo, but from the viewpoint of safety, Patent Document 1 describes a manufacturing method that does not use such chemicals. According to this production method, a method of immersing bamboo in water to extract sugar and lye and inactivating insect eggs laid on bamboo is described. That is, instead of using chemicals, heat treatment is performed with pressurized steam at 100 ° C. or higher and 300 ° C. or lower, and the mixture is dried so that the water content is 10% or higher and 30% or lower to obtain an antifungal effect. ..

However, in the manufacturing method of Patent Document 1, even if the bamboo material, which is a natural material, is processed into tableware as it is, it is difficult to sterilize the deep part of the bamboo material, and the mold is completely generated. To prevent this, a soaking time of 24 hours or more and 140 hours or less was required.

Therefore, the present inventor has previously invented the method for producing bamboo chopsticks described in Patent Document 2. This manufacturing method is a manufacturing method in which bamboo chopsticks can be sterilized deeply without using chemicals or pesticides, and the growth of mold can be reliably prevented. That is, by irradiating ultrasonic waves and ultraviolet rays to dry the bamboo chopsticks in several stages, and finally drying the water content of the bamboo chopsticks to 7%, the bamboo chopsticks can be sterilized deeply, and the generation of mold is surely performed. It is a manufacturing method to prevent.

On the other hand, a straw formed by using a plant fiber powder such as bamboo fiber is described in Patent Document 3. This straw is intended to provide an environment-friendly straw that reduces environmental pollution by fusing polylactic acid or polypropylene with plant fiber powder and forming it by extrusion molding as an alternative material to plastic.

Japanese Unexamined Patent Publication No. 2004-249041 Japanese Patent No. 5278852 Utility Model Registration No. 32198993

By the manufacturing method described in Patent Document 2, it was possible to sterilize bamboo products deeply without using chemicals, and succeeded in reliably preventing the growth of mold. Therefore, it is desired to utilize bamboo, which is a natural material, for straws by further improving this manufacturing method.

At present, the harmful effects of waste plastics that have flowed into the ocean are becoming more serious. That is, in addition to the environmental pollution of the waste plastic itself, the microplastic fragmented and diffused from the waste plastic may be taken into the food chain and adversely affect the ecosystem, so that there is a concern about the so-called waste plastic problem. ing. Therefore, attention is being paid to the use of natural materials such as straws instead of plastic.

On the other hand, the straw described in Patent Document 3 also uses a plant fiber powder containing bamboo fiber or the like for the purpose of reducing environmental pollution. However, in addition to polylactic acid having biodegradability, one of the thermoplastic resins such as polypropylene is selected and fused, so 100% of natural materials are not used. Therefore, only a limited number of straw materials were used to replace plastic.

Therefore, the present invention was created to solve the above-mentioned problems, and it is possible to use 100% natural bamboo as an alternative material to solve the problem of waste plastic, and to use natural bamboo extremely safely. The purpose is to provide possible bamboo straws.

In order to achieve the above object, the first means in the present invention is to form a tubular body P1 by making the outer diameter of the bamboo P without a core uniform in a bamboo straw made of bamboo P made of a natural material. The tubular body P1 is formed by drying it to a water content of about 6 to 7% by irradiation with ultrasonic waves and ultraviolet rays.

The bamboo P of the second means is made of Moso bamboo, which is 3 to 4 years old, and the tubular body P1 is formed to have an outer diameter of 7 to 8 mm and an inner diameter of 5 to 6 mm.

The third means is a cutting step 100 of cutting the bamboo P to 150 to 200 mm, a heat sterilization step 200 of heating and sterilizing the cut bamboo P in a hot kiln S, and a sterilized bamboo in the method for producing a bamboo straw. A hollowing step 300 of inserting a drill blade Q into the inside of P to hollow out the core, an external cutting step 400 of cutting the outer circumference of the bamboo P to form a tubular body P1 having a uniform outer diameter, and a tubular body P1. The inside and outside polishing step 500 for polishing the inside and outside of the cylinder, the bamboo powder removing step 600 for removing the bamboo powder adhering to the cylinder P1 after polishing, and the cylinder P1 being irradiated with ultrasonic waves and ultraviolet rays to have a water content of 6 The manufacturing method includes a drying step 700 of drying to about 7%.

The fourth means is formed to have an inner diameter of 5 to 6 mm in the hollowing step 300 and an outer diameter of 7 to 8 mm in the outer cutting step 400.

In the drying step 700 of the fifth means, the moisture content of the cylinder P1 is 6 to 7 by the sterilization drying device T that irradiates the cylinder P1 with ultrasonic waves and ultraviolet rays for 60 seconds while transporting the cylinder P1 by the conveyor belt 1. It is a step of drying to%.

As described in claim 1 of the present invention, a bamboo straw made of bamboo P, which is a natural material, forms a cylinder P1 by making the outer diameter of the coreless bamboo P uniform, and the cylinder P1 is formed. Since it is dried to a water content of about 6 to 7% by irradiation with ultrasonic waves and ultraviolet rays, sufficient antifungal and bactericidal effects can be obtained without using chemicals such as antifungal agents and preservatives, and it is extremely safe. Can be used. Moreover, since it uses 100% natural materials and does not use any plastic, it is effective as an alternative product that solves the problem of waste plastic.

As in claim 2, the bamboo P is made of Moso bamboo, which is 3 to 4 years old, and the tubular body P1 is formed to have an outer diameter of 7 to 8 mm and an inner diameter of 5 to 6 mm, and is therefore generally used. A straw of the desired size can be formed by easy processing.

According to the manufacturing methods of claims 3 to 5, the tubular body P1 formed of bamboo P, which is a natural material, can be reliably dried in a short time. As a result, it is possible to provide a safe straw in a short time by using bamboo, which is a natural material that is effective as an alternative product to solve the problem of waste plastic.

It is a top view which shows the Example of the straw of this invention. It is an end view which shows one Example of the straw of this invention. (A) to (c) are schematic views showing the manufacturing process of the present invention. It is the schematic which shows the sterilization drying apparatus of this invention. It is a process drawing which shows the drying method of this invention.

The present invention is a straw 10 formed of bamboo P, which is a natural material. As the type of bamboo P, it is preferable to use matake. Matake is a type of bamboo that grows to a height of 10 to 20 m and a thickness of about 10 cm. It is used for crafts and crafts such as bows, rulers, folding fans, and tea utensils, and is also used as a material for fishing rods and bamboo spears. ing. In the present invention, the straw 10 is formed by drying such bamboo P by irradiation with ultrasonic waves and ultraviolet rays.

That is, in the present invention, the core of the bamboo P having a size suitable for the straw 10 is pulled out, and a tubular body P1 having a uniform outer diameter is formed, and the tubular body P1 is irradiated with ultrasonic waves and ultraviolet rays to have a water content of 6 to 7. It is dried to about% (see FIG. 1). At this time, the straw 10 formed by the tubular body P1 is generally formed to have an outer diameter (X) of 7 to 8 mm, an inner diameter (Y) of 5 to 6 mm, and a length of 150 to 200 mm, as shown in FIG. It becomes a size that can be used as a straw.

Next, the manufacturing process of the straw 10 will be described. In this manufacturing process, a cutting process 100, a heat sterilization process 200, a hollowing process 300, an outer cutting process 400, an inner / outer polishing process 500, a bamboo powder removing process 600, and a drying process 700 are performed in this order (see FIG. 5).

First, in the cutting step 100, a thin bamboo P having a thickness of about 10 mm is cut down at an age of 3 to 4 years and cut to a length of 150 to 200 mm (see FIG. 3 (a)).

Next, after undergoing a heat sterilization step 200 in which bamboo P cut to a predetermined length is placed in a kiln and heat sterilized, a drill blade Q is inserted into the bamboo P in a hollowing step 300 to form an inner diameter of 5 It is hollowed out to 6 mm (see Fig. 3 (b)).

Further, in the outer cutting step 400, the outer circumference of the bamboo P is ground with a polishing machine R to form a tubular body P1 having an outer diameter of 7 to 8 mm (see FIG. 3 (c)). Since natural bamboo P has irregular internal wall thickness and outer diameter, it is adjusted to a constant size by a hollowing process 300 and an external cutting process 400. After that, by the inner / outer polishing step 500, the inner diameter of the tubular body P1 is polished and brushed, and the outer diameter is polished to form a straw 10.

In this internal / external polishing step 500, bamboo powder is in a state of adhering to the tubular body P1 after polishing, so the bamboo powder is removed by high-pressure air in the bamboo powder removing step 600. Finally, the drying step 700 is performed by irradiating the straw 10 formed in the tubular body P1 with ultrasonic waves and ultraviolet rays to dry the straw 10.

The drying step 700 uses the sterilization drying device T (see FIG. 4). In this sterilization / drying device T, an ultrasonic irradiation chamber 2 and an ultraviolet irradiation chamber 3 are arranged along a conveyor belt 1 that conveys a tubular body P1.

Further, two irradiation devices 5 having a control unit 4 for controlling the ultrasonic irradiation means of the ultrasonic irradiation chamber 2 and the ultrasonic irradiation means of the ultraviolet irradiation chamber 3 are arranged in parallel (see FIG. 4). .. Then, the ultrasonic wave irradiation is performed twice from each ultrasonic wave irradiation chamber 2. As a result, the bamboo chopsticks conveyed by the conveyor belt 1 are sterilized and dried to a moisture content of 7% by four times ultrasonic irradiation and two times ultraviolet irradiation.

The configuration of the present invention is not limited to the illustrated configuration, and the design can be freely changed without changing the gist of the present invention. Further, the use examples of the present invention are not limited.

P Bamboo P1 Cylinder Q Drill blade R Polishing machine T Sterilization and drying device 1 Conveyor belt 2 Ultrasonic irradiation room 3 Ultraviolet irradiation room 4 Control unit 5 Irradiation device 6 Exhaust port 7 Cooling room 8 Control panel 10 Straw 100 Cutting process 200 Thermal sterilization Process 300 Hollowing process 400 Outer cutting process 500 Inner and outer polishing process 600 Bamboo powder removal process 700 Drying process X Outer diameter Y Inner diameter

Claims (5)

In a bamboo straw made of natural bamboo, the outer diameter of the cored bamboo is made uniform to form a cylinder, and the cylinder is irradiated with ultrasonic waves and ultraviolet rays to a water content of about 6 to 7%. A bamboo straw that is characterized by being dried. The bamboo straw according to claim 1, wherein the bamboo is Moso bamboo, which is 3 to 4 years old, and the cylinder has an outer diameter of 7 to 8 mm and an inner diameter of 5 to 6 mm. In the method for manufacturing a bamboo straw,
The cutting process of cutting bamboo to 150-200 mm and
A heat sterilization process that heats and sterilizes the cut bamboo in a hot kiln,
A hollowing process in which a drill blade is inserted inside the sterilized bamboo to hollow out the core,
The outer cutting process of cutting the outer circumference of bamboo to form a cylinder with a uniform outer diameter,
Inside and outside polishing process to polish the inside and outside of the cylinder,
Bamboo powder removal process to remove bamboo powder adhering to the cylinder after polishing,
A method for producing a bamboo straw, which comprises a drying step of irradiating a cylinder with ultrasonic waves and ultraviolet rays to dry it to a water content of about 6 to 7%. The method for producing a bamboo straw according to claim 3, wherein the bamboo P is formed to have an inner diameter of 5 to 6 mm in the hollowing step, and the tubular body P1 is formed to have an outer diameter of 7 to 8 mm in the outer cutting step. The drying step is a step of drying the water content of the cylinder to 6 to 7% with a sterilization drying device that irradiates ultrasonic waves and ultraviolet rays for 60 seconds while transporting the cylinder by a conveyor belt. The method for manufacturing a bamboo straw described.

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