JP2012050632A - Washable chopstick, and method for reinforcing peripheral edge corner of head of the washable chopstick - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide effective and simple method for protective reinforcement of a head peripheral edge corner 4 to solve such a problem that a washable chopstick 1 mainly uses a lacquered chopstick in the view point of appearance, durability, or the like, especially the peripheral edge corner of a head end 3, i.e., the head peripheral edge corner 4, of the washable chopstick 1 is apt to be damaged when a large amount of washable chopsticks 1 are washed in a washing machine or the like, the damage causes cracks or pealing, the life cycle of the chopstick is reduced, molds or bacteria are proliferated, visual or hygienic trouble occurs.SOLUTION: A reinforcement method includes heating and shrinking a heat-shrinkable tube-shaped film 6 over the head 2 of the washable stick 1 and covering and reinforcing the head peripheral edge corner 4.

Description

  The present invention relates to a means for preventing surface damage of cleaning chopsticks mainly used for business, and more particularly, a strengthening method for preventing damage to the head peripheral corners that occurs when cleaning the cleaning chopsticks, and its enhanced cleaning. Regarding chopsticks.

There are two types of chopsticks used for meals: disposable ones such as disposable chopsticks and ones that are used repeatedly such as painted chopsticks.
At home, chopsticks dedicated to each person are used and used repeatedly, and disposable chopsticks such as disposable chopsticks are used mainly at restaurants and restaurants.
However, in recent years, from the viewpoint of ecological problems and environmental protection, the momentum to avoid disposable products has increased, and so-called washing chopsticks, which are used repeatedly, are also being used in the field of business such as the restaurant industry that used disposable chopsticks. It is getting more.

Disposable products such as disposable chopsticks in restaurants are inferior in terms of luxury and appearance, but have been widely used because of their sanitary advantage of being discarded once.
On the other hand, since cleaning chopsticks are used repeatedly by others, as a position to use them, they understand the social background of environmental protection issues, but tend to avoid them in the emotional aspect. Is the actual situation.

Therefore, from the standpoint of providing cleaning chopsticks, pay attention not only to hygiene, but also to make it visually appealing so as not to cause discomfort on the user side as much as possible. In terms of surface, we have been seeking wash chopsticks that are as durable as possible.
In order to satisfy these circumstances, one is to provide hygienic, high-class and easy-to-use cleaning chopsticks, and one is the repeated use without surface scratches and damage. It has been noted that it provides durable cleaning chopsticks that do not give a feeling, in other words, are new.
With regard to durability, there has been a demand for cleaning chopsticks with high surface durability as well as strength against bending and bending of the cleaning chopsticks.

In response to these requirements, as shown in Patent Document 1, a highly durable cleaning chopstick using a plastic material has been proposed.
Also, as shown in Patent Document 2, a cleaning device has been proposed that is devised so as not to damage as much as possible when cleaning the cleaning chopsticks.
Furthermore, as shown in Patent Document 3, there has been proposed a cleaning chopstick that is not damaged during cleaning as much as possible by devising the shape of the cleaning chopstick.

However, although the cleaning chopsticks using the plastic material of Patent Document 1 can ensure the durability, it is not satisfactory for the user because of the high-class feeling and usability.
In addition, as for the means for damaging the washing chopsticks as much as possible by improving the washing device in Patent Document 2, although the apparatus itself is effective, the current situation of washing the washing chopsticks is that a large number of washing chopsticks are washed in running water. There are many means for cleaning in a state close to stirring, and cleaning is often carried out by rubbing by hand, and damage due to surface scratching or impact has not been solved.
Furthermore, the cleaning chopsticks of Patent Document 3 cannot be denied, although the effect is obtained, but the manufacturing process and cost are difficult.

JP 2006-158811 A JP-A-9-51868 Japanese Patent No. 4396947

As described above, wood and bamboo materials are used as washing chopsticks that can accept all of the demands for washing chopsticks, such as hygiene, ease of use, luxury, maintenance of newness, durability, and reduction in production costs. The mainstream is the application of coated chopsticks, in which synthetic paint is applied to the chopsticks and the head end is formed in a substantially flat shape.
The chopsticks coated with synthetic paint have a high-class feel like lacquering at first glance, and are easy to use with an appropriate weight.
In addition, it is possible to withstand surface abrasion for a relatively long period of time by devising the paint, and the newness can be maintained. In addition, it has the advantages of being capable of mass production and clearing cost issues.

However, when coated chopsticks are used as washing chopsticks, the head end is formed in a substantially flat shape because it is easy to mold, and many of them form a head peripheral corner with a cross section of approximately 90 degrees. is doing.
The peripheral edge of the head is damaged by friction and impact caused by contact with the wall of the cleaner or contact between chopsticks when it is cleaned with a washer or hand wash. Moisture permeates from the surface and further peels off, causing a phenomenon in which the head part peels off at a stretch, generation of mold and bacteria, which is a big problem both visually and hygienically.

  In this way, damage to the corners of the head edge reduces the newness of the cleaning chopsticks and makes it unsanitary, resulting in extremely shortening the life of the cleaning chopsticks and providing it to customers who use it. It has become a big issue that should be solved by those who do it.

As a means to solve these problems, a semi-spherical means was adopted in order to make the head peripheral corners as gentle as possible without making the head end flat, but the processing was cumbersome and expensive. It was the cause.
For example, a product has been proposed in which a resin coating is thickened on the end of the head and the entire head is hemispherically headed. Due to the fact that the thermal expansion does not match, there has been a problem of peeling off at once when washing and drying with a washing machine or the like are repeated.

In order to prevent the hemispherically headed resin lump from peeling off, a proposal has been made to increase the gripping force of the resin lump by providing protrusions at the head end of the material chopsticks as shown in Patent Document 3. Yes.
However, high technical power is required for the process of providing protrusions and the process of increasing thickness, thereby causing various problems in the manufacturing process and high costs.
In addition, even if the head end of the material chopsticks itself is not flattened and made hemispherical, the corners of the head edge are not completely lost, and the part from the side of the cleaning chopstick to the head end is easily damaged. There were not a few.

  For these reasons, as described above, as the cleaning chopsticks, the coated chopsticks having the head end portion of the cleaning chopsticks formed in a substantially flat shape and the peripheral edge corners of the head are the mainstream as a result. A means for preventing fatal damage to the peripheral edge portion of the head has been strongly desired.

The present invention has been made against the background of the above circumstances.
That is, the object of the present invention is to provide an extremely simple and effective treatment for protecting the head rim corner on the head of the cleaning chopsticks, and prevent damage to the head rim corner. An object of the present invention is to provide a method for preventing the penetration of moisture and the like from the water and maintaining a sanitary state and maintaining a new appearance, and a cleaning chopstick obtained by the method.

  As a result of earnest and research to solve the above problems, heat-shrinkable tube-like film on the head of the washing chopsticks, that is, heat-shrinkable tube-like film is heated and shrunk to strengthen the peripheral edge of the head. And a cleaning chopstick obtained by the strengthening method.

  That is, the present invention is (1) a heat-shrinkable tubular film is heat-shrinked at the peripheral edge of the head of the cleaning chopsticks having a substantially flat head end, and the peripheral edge of the head is reinforced. Lies in cleaning chopsticks.

  That is, the present invention resides in (2) the cleaning chopsticks according to the above (1), wherein the heat-shrinkable tubular film is heat-shrinked by forming an uncoated portion at the center of the head end portion.

  That is, the present invention is (3) a method for strengthening the peripheral edge of the head of the cleaning chopsticks, and 1) extrapolating the heat-shrinkable tubular film to the cleaning chopsticks, and the rear end of the heat-shrinkable tubular film A positioning step for positioning the projection so that it protrudes from the head end of the cleaning chopstick by a certain length, 2) a shrinkage coating step for heating and shrinking the heat-shrinkable tubular film to cover the peripheral edge of the head, and Enhance method.

  That is, the present invention resides in (4) the method of strengthening the cleaning chopsticks according to 3 above, wherein the fixed length is smaller than the shortest length from the center of the head end to the corner of the head.

  That is, the present invention is (5) a method for strengthening the peripheral edge of the head of the cleaning chopsticks, and 1) an outer peripheral groove forming step of forming an outer peripheral groove having a constant width on the head to form a neck portion; ) Extrapolating the heat-shrinkable tubular film to the cleaning chopsticks, positioning the rear end of the heat-shrinkable tubular film so that it protrudes a certain length from the peripheral edge of the lower end of the outer peripheral groove, 3) Heat-shrinkable tubular shape There is a shrinkage coating step of shrinking and coating the film on the peripheral edge of the lower end of the outer peripheral groove by heating, and 4) a method of strengthening the cleaning chopsticks comprising a cutting step of cutting the cleaning chopsticks at the lower end position of the neck portion.

  That is, the present invention resides in (6) the method for reinforcing cleaning chopsticks as described in 5 above, wherein the fixed length is longer than the groove width and the shortest depth of the outer peripheral groove.

  In addition, as long as the objective of this invention is followed, the structure which combined said (1)-(6) suitably is also employable.

  The method for strengthening the head peripheral corner of the present invention is to extrapolate a heat-shrinkable tubular film of a certain length to the head of the material chopsticks, and heat-shrink it to cover the head peripheral corner. Since it is a simple strengthening method, it does not require processing time, requires no skill, and has the advantage that it can be strengthened at a very low cost.

  And in this strengthening method, since the heat-shrinkable tubular film is heated and shrunk to cover and strengthen the peripheral edge corner of the head, the material and thickness of the heat-shrinkable tubular film can be freely selected, It is possible to reinforce the coating optimally according to the processing state and usage environment of the material chopsticks.

  And in this reinforcement | strengthening method, since a film is a tube shape, uniform and reliable covering reinforcement | strengthening is attained with respect to all the places of a head periphery corner | angular part.

  And in this reinforcement | strengthening method, since a heat-shrinkable tubular film can be piled up and covered repeatedly as needed, the reinforcement | strengthening level can be freely changed with one kind of heat-shrinkable tubular film.

And in this reinforcement | strengthening method, after forming the neck part by forming the outer peripheral groove | channel of fixed width in the head of washing | cleaning chopsticks, and covering and reinforcing the lower end peripheral part of an outer peripheral groove | channel with a heat-shrinkable tubular film, When cutting the cleaning chopsticks at the lower end, the clearing agent can be applied using the head above the neck as a knob, so the processing is easy and beautiful without touching the cleaning chopstick body during processing. There is an advantage to become.
Also, even if there is a knob part, when a certain coating process is performed, if the knob part is cut off at the lower end position of the neck part, the lower peripheral edge of the outer peripheral groove becomes the peripheral edge of the head of the cleaning chopsticks, and the complete figure Can be obtained.

  And in this reinforcement | strengthening method, when covering and strengthening a head periphery corner | angular part, it adjusts to the center part of a head end part by adjusting the length which the rear end of a heat-shrinkable tubular film protrudes from a head periphery corner | angular part. Since the uncovered part can be formed, the head of the material chopsticks can be directly headed with synthetic resin, etc., and the heading adhesiveness, in other words, the anchoring effect is good, and the durability is improved. There are advantages to doing.

FIG. 1 is a schematic view of the actual situation of the cleaning chopsticks 1 reinforced with a heat-shrinkable tubular film 6. FIGS. 2A to 2C are explanatory diagrams (partially omitted) showing the order of steps in which the heat-shrinkable tubular film 6 is extrapolated to the head 2 and heat-shrinked. 3A to 3C are explanatory views (partially omitted) corresponding to FIGS. 2A to 2C, and show cross-sectional views of the head 2. 4 (A) to 4 (E) are explanatory diagrams in order of processing steps in which the outer peripheral groove 14 is formed in the material chopsticks 11, the heat-shrinkable tubular film is heated and contracted, and then the handle 12 is separated (partially omitted). ). FIGS. 5A to 5E are explanatory views (partially omitted) in the order of processing steps corresponding to FIGS. FIG. 6 is a cross-sectional explanatory view (partially omitted) of the head 2 in the cleaning chopsticks 1. FIG. 7 is a cross-sectional explanatory view (partially omitted) in which the outer peripheral groove 14 is formed in the material chopsticks 11. FIGS. 8A to 8C are schematic cross-sectional views (partially omitted) of the respective shapes of the outer circumferential groove 14. FIGS. 9A and 9B are explanatory diagrams (partially omitted) of extrapolation and temporary fixing in the flat heat-shrinkable tubular film 6. 10A is a schematic cross-sectional view (partially omitted) of the head 2 covered with the heat-shrinkable tubular film 6, and FIG. 10B is a schematic cross-sectional view of the head 2 with the head 7 attached. It is a figure (a part is omitted). FIG. 11 (A) is a schematic diagram (partially omitted) of the cleaning chopstick 1 in which the head end portion is formed in a semi-ellipsoidal shape and the vicinity of the head portion 2 is formed in a square cross section, and FIG. FIG. 3 is a schematic view (partially omitted) of the cleaning chopsticks 1 in which the head end portion 3 is formed in a semi-oval shape and the vicinity of the head portion 2 is formed in a circular cross section. FIG. 12 is a schematic diagram (partially omitted) of the heat-shrinkable tubular film 6 shown in FIG. 11A in which a pattern is used.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary.

(First embodiment)
In the present embodiment, as shown in FIG. 1, the heat shrinkable tubular film 6 of about 20 mm is heated and shrunk to the head 2 of the cleaning chopstick 1, and the head 2 peripheral angle formed at the periphery of the head end 3. The portion 4 is reinforced.
The processing steps of the cleaning chopsticks 1 are shown in FIG. 2 (any of (A), (B), (C) showing the order of the steps, showing the vicinity of the head 2 and partially omitted for convenience). I will explain later.
3A, 3B, and 3C, the cross-sectional views corresponding to FIGS. 2A, 2B, and 2C are shown in the order of the processes (A, B, and C). Is a cross-sectional view of the vicinity of the head 2 and is partially omitted for convenience).

In the main chopsticks 1, the head 2 has a circular cross section, and the head end 3 is substantially flat. A head periphery corner 4 is formed on the periphery of the head end 3 and the diameter of the head end 3 is formed to a thickness of 10 mm, for example.
Then, as shown in FIG. 2A (showing the vicinity of the head 2 and partially omitted), the heat-shrinkable tubular film 6 cut into a length of, for example, 20 mm is extrapolated to the head 2.
As the material of the heat-shrinkable tubular film 6, for example, polyethylene terephthalate is used from the viewpoints of high heat-shrinkability, ease of adapting to the surface, compatibility with paints (clearing agents and the like), and the like.

About extrapolation positioning, as shown to FIG. 2 (B), it fixes temporarily (namely, temporary positioning) in the state which made the rear end of the heat-shrinkable tubular film 6 cut out fixed length.
As for temporary fixation, as shown in FIG. 9 (explanation of extrapolation and temporary fixation, part of which is omitted), if the heat-shrinkable tubular film 6 is flattened, this is expanded. When extrapolated to the head 2, the restoring force P for returning to the original flat shape works and is temporarily fixed to the head 2, so that the work is easy and reliable.

As for the protrusion having a certain length, it is necessary to heat-shrink the heat-shrinkable tubular film 6 by forming an uncovered portion 5 that leaves a part of the central portion of the head end portion 3 as shown in FIG. Therefore, the protrusion length L is important.
In order to form the uncovered portion 5 on the head end portion 3, as shown in FIG. 6 (a cross-sectional explanatory view of the head portion 2, a part is omitted), the protrusion length L is changed from the center of the head end portion 3 to the head periphery. It is necessary to make it smaller than the shortest length R to the corner 4.

In the case of this embodiment, since the cross section of the head 2 is circular, the length from the center of the head end 3 to the head peripheral edge 4 is not changed. For example, when the cross section of the head 2 is a square or the like Since the length from the center of the head end portion 3 to the head peripheral corner portion 4 is not constant, it is better to limit the length to be smaller than the shortest length R.
In the case of the present embodiment, if the radius of the circular head end portion 3 is 5 mm, for example, the protruding length L is 2 mm which is 5 mm or less.
The heat-shrinkable tubular film 6 is reduced in diameter but hardly contracts in the longitudinal direction due to its properties.
Therefore, the projected 2 mm is ensured with almost the same length.

The heat-shrinkable tubular film 6 temporarily fixed in this way is heat-treated at the next stage. The heat treatment uses warm air, hot water, radiant heat from an electric heater, or the like.
By this treatment, the heat-shrinkable tubular film 6 is heat-shrinked and fixed to the head peripheral corner 4.
In other words, the head peripheral edge 4 is reinforced.
As a result, as shown in FIG. 2C, a circular uncovered portion 5 having a diameter of 6 mm (10-2-2 = 6) is formed in the central portion of the head end portion 3.
The non-covered portion 5 in the head end 3 shown in FIG. 10A (a schematic cross-sectional view of the head 2 covered with the heat-shrinkable tubular film 6, partially omitted) formed in this way is shown in FIG. ) (Cross-sectional diagram of the head 2 with the head 7, partially omitted) Using the resin paint, a gentle arcuate head 7 is applied to complete the cleaning chopsticks 1.

  Here, when the entire surface of the head end portion 3 is covered with the heat-shrinkable tubular film 6, a heading 7 made of a resin paint is applied on the heat-shrinkable tubular film 6. When the covering portion 5 is present, the resin coating of the head 7 is directly bonded to the main body of the cleaning chopstick 1, and the resin coating penetrates into the base of the non-covering portion 5, thereby improving the anchoring effective adhesive strength. There are advantages.

(Second Embodiment)
In the present embodiment, a convenient means for processing the cleaning chopsticks 1 is taken. The processing will be described step by step with reference to FIG.
5 (A), (B), (C), (D), and (E) are cross sections corresponding to FIGS. 4 (A), (B), (C), (D), and (E). It is a figure and is a figure which omitted a part.

As shown in FIG. 4B, the material chopsticks 11 that are the material of the cleaning chopsticks 1 shown in FIG. 4A have a constant width outer peripheral groove 14 at a certain distance from the tip of the material chopsticks 11. It is formed.
The material chopsticks 11 at the location where the outer circumferential groove 14 is formed become thinner and the neck portion 13 is formed.
The thick portion on the upper side of the neck portion 13 becomes a handle 12 and is convenient for processing such as drying and clear coating. The lower side is the cleaning chopsticks 1.

In this embodiment, the outer circumferential groove 14 is cut into a U-shaped cross section, but the cross section is a trapezoidal shape as shown in FIG. 8A, or a V shape as shown in FIG. 8B. A mold can also be adopted, and a deformed section as shown in FIG. 8C is also possible.
FIGS. 8A, 8B, and 8C are all schematic cross-sectional views of the outer circumferential groove 14, and a part thereof is omitted for convenience.

  As shown in FIG. 4C, the heat-shrinkable tubular film 6 cut to a length of, for example, 20 mm is extrapolated to the material chopsticks 11 having the outer peripheral grooves 14 formed in this way, and the heat-shrinkable tubular film 6 is Temporarily fix the end so that it protrudes a certain length from the lower peripheral edge of the outer circumferential groove.

The protrusion length L and its significance are as described in the first embodiment. However, FIG. 7 (a cross-sectional explanatory view of the material chopsticks 11 formed with an outer peripheral groove, partially omitted) In this case, the protrusion length L is preferably smaller than the shortest depth D of the groove and smaller than the groove width W, as shown in FIG.
The reason why the shortest depth D is used is that the cross section of the head 2 is not necessarily circular, and the depth of the outer circumferential groove 14 varies depending on the location in the case of a quadrangle or the like.
And the heat-shrinkable tubular film 6 temporarily fixed is heat-shrinked as shown in FIG.

Thereafter, the material chopsticks 11 are subjected to clear painting or the like with the handle 12.
Since there is a handle 12, the material chopsticks 11 are not touched and a beautiful finish can be obtained.
Further, when the material chopsticks 11 are dried, for example, if the handle 12 is pulled between two levers, a flow operation can be performed, and the production efficiency can be improved.
After drying, the handle 12 is cut off near the lower end of the neck portion 13 as shown in FIG.
The lower side of the cut material chopsticks 11 is the periphery of the head end 3 as shown in FIG. 10A (a schematic cross-sectional view of the head 2 covered with the heat-shrinkable tubular film 6, partially omitted). The heat-shrinkable tubular film 6 is heat-shrinked, and an uncoated portion 5 is formed at the center.
Then, as shown in FIG. 10B (schematic cross-sectional view of the head 2 with the head 7, part of which is omitted), the head end 3 is subjected to a gentle arc surface with a resin paint or the like. Is done. Thus, the cleaning chopsticks 1 are completed.
The lower peripheral edge of the outer peripheral groove 14 becomes the head peripheral edge 4 of the cleaning chopstick 1 when the handle is cut off.

(Third embodiment)
In the present embodiment, as shown in FIG. 11 (A) (actual schematic diagram of the head 2 having a hemispherical head end portion, partly omitted), the head end portion is hemispherical (bullet). Shape). The cross section near the head 2 of the cleaning chopstick 1 is a quadrangle as shown by the broken line.
The processing of the main cleaning chopsticks 1 is the same as that of the second embodiment, but the formation of the outer peripheral groove 14 is different.
That is, as shown in FIG. 8C, the outer circumferential groove 14 is formed to have a deformed trapezoidal shape in which the cross section protrudes outward.

FIG. 11A is a schematic diagram (partially omitted) of the cleaning chopstick 1 in which the head end portion is formed in a semi-ellipsoidal shape and the vicinity of the head portion 2 is formed in a square cross section.
By doing so, the cleaning chopsticks 1 having a hemispherical head end are obtained.
The head peripheral corner 4 of the cleaning chopstick 1 formed in this way has a wavy locus as if the pencil was sharpened with a pencil sharpener. The wavy head peripheral corner 4 is reliably reinforced by the heat-shrinkable tubular film 6.

  Here, the vicinity of the head 2 of the cleaning chopstick 1 has a circular cross section, and FIG. 11B (the head end is formed in a hemispherical shape as shown in FIG. 11B). However, a discontinuous surface is formed at the peripheral portion from the side surface of the cleaning chopstick 1 to the spherical surface of the head end portion 3, and the head peripheral edge portion 4 is formed although it is a gentle angle. Covering the tubular film 6 has a great reinforcing effect.

The present invention has been described above by taking the embodiment thereof as an example. However, the present invention is not limited to the embodiment as long as the gist is not changed, and various modifications are possible.
For example, the reinforcing heat-shrinkable tubular film 6 may be not only transparent but also provided with a pattern.
By using the heat-shrinkable tubular film 6 provided with a pattern, a continuous pattern from the periphery of the head of the chopsticks to the end surface can be provided.
It is extremely useful because it can be patterned at the same time as strengthening the head.

  By the way, FIG. 12 shows the example at the time of using what was provided with the pattern as the heat-shrinkable tubular film 6 in FIG. Continuous patterning is possible from the circumference of the head of the chopsticks to a part of the hemispherical shape.

Moreover, the coating reinforcement | strengthening by the heat-shrinkable tube-shaped film 6 can also carry out the coating reinforcement | strengthening by carrying out the coating | cover of the heat-shrinkable tube-shaped film 6 in multiple times, and overlapping several times as needed.
Furthermore, the coating reinforcement by the heat-shrinkable tubular film 6 can be applied to material chopsticks, undercoating chopsticks, finishing chopsticks, and the like.

  According to the strengthening method for the head peripheral corner 4 of the cleaning chopsticks 1 of the present invention, the heat-shrinkable tubular film 6 is extrapolated to the head peripheral corner 4 that is most easily damaged by the cleaning chopstick 1, and heat contracted. Since this is a simple method, it is possible to easily reinforce the corner of a corner having a corner like a chopstick.

For example, this strengthening method can be applied to a long and narrow object such as a bag or a part where a square member protrudes in furniture such as a chair or a table. Moreover, the metal corners, such as a knife and a fork, can cover the various corner | angular parts which a design has without conspicuously, and can eliminate the obstacle to a user or another tableware.
Furthermore, the stationery can be used in various industrial fields, such as covering the corners of the stationery and improving the user-friendliness.

DESCRIPTION OF SYMBOLS 1 ... Washing chopsticks 2 ... Head 3 ... Head end 4 ... Head peripheral corner 5 ... Uncovered part 6 ... Heat-shrinkable tubular film 7 ... Head Append 11 ... Material chopsticks 12 ... Handle 13 ... Neck 14 ... Peripheral groove L ... Projection length R ... Shortest length D ... Shortest depth W ... Best Narrow P ・ ・ ・ Restoring power

Claims (6)

  Washing chopsticks characterized in that a heat-shrinkable tubular film is heated and shrunk to the corners of the head edge of the washing chopsticks having a substantially flat head end, and the head edge corners are reinforced. .   2. The cleaning chopsticks according to claim 1, wherein the heat-shrinkable tubular film is heat-shrinked by forming an uncoated portion at the center of the head end portion. A method of strengthening the peripheral edge of the head of the cleaning chopsticks,
1) a positioning step of extrapolating the heat-shrinkable tubular film into the cleaning chopsticks and positioning the rear end of the heat-shrinkable tubular film so that it protrudes from the head end of the cleaning chopsticks by a certain length;
2) Shrinkage coating step of heating and shrinking the heat-shrinkable tubular film to cover the peripheral edge of the head,
A method for strengthening cleaning chopsticks, comprising:   4. The method for strengthening washing chopsticks according to claim 3, wherein the predetermined length is smaller than the shortest length from the center of the head end portion to the corner portion of the head periphery. A method for strengthening the peripheral edge of the head of the cleaning chopsticks,
1) An outer peripheral groove forming step of forming an outer peripheral groove having a constant width on the head to form a neck portion;
2) A positioning step in which the heat-shrinkable tubular film is extrapolated to the washing chopsticks and positioned so that the rear end of the heat-shrinkable tubular film protrudes from the peripheral edge of the lower end of the outer circumferential groove by a certain length.
3) A shrink coating process for shrink-coating the heat-shrinkable tubular film on the lower peripheral edge of the outer circumferential groove by heating,
4) A method for strengthening cleaning chopsticks, comprising a cutting step of cutting the cleaning chopsticks at a lower end position of the neck portion. 6. The method of reinforcing a cleaning chopstick according to claim 5, wherein the fixed length is smaller than the groove width and the shortest depth of the outer peripheral groove.

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