KR100720162B1 - Manufacturing method of fishing float using resin compound - Google Patents

Abstract

The present invention relates to a manufacturing method of fishing bobber using a resin composition, more specifically, PP (polypropylene), PE (polyethylene), PS (polystyrene), PC (polycarbonate), ABS resin (acrylonitrile butadiene styrene resin) , The body part of fishing bobber, which is classified as a hole bobber or stick with a resin composition mixed with HIPS (High Impact Polystyrene) and a resin composition mixed with 5-phenyl tetrazole (5-phenyl tetrazole) as a blowing agent. By molding by the injection foaming method, the strength is very excellent and the water does not penetrate at all, the myriad pores formed in accordance with the foaming of the foaming agent to form the body of the fishing bobber that acts as a buoyancy material, thereby According to the control of the content of various buoyancy fishing bobber can be easily manufactured, the process according to the manufacturing of fishing bobber To reduce the manufacturing cost significantly, and to greatly improve the quality of the fishing bobber by increasing the convenience of painting and the adhesion of the paint, and at the same time, in the case of the hole bobber, a separate pipe or ceramic ring in the fishing line insertion hole The present invention relates to a method for manufacturing fishing bobbers using a resin composition, by which a buoyancy change due to moisture permeation does not occur even if the back is not inserted, so that an excellent quality bobber can be supplied at a very low price through minimization of the process step.

Fishing bobber, hole bobber, stick, synthetic resin, foaming agent

Description

Manufacturing method of fishing float using resin compound

1 is a process block diagram showing a method of manufacturing bobber according to the present invention.

Figure 2 (a) and (b) is a process chart showing the step of injection molding the body of the hole according to the present invention.

Figure 3 (a) and (b) is a process chart showing the step of injection molding the body of the rod according to the present invention.

<Explanation of symbols for main parts of drawing>

1: injection mold 2: 1st mold 3: 2nd mold

4 hole molding pin 5 injection space part 6 resin composition

10: mixing the composition step 20: injection molding step 30: commercialization step

The present invention relates to a method of manufacturing a fishing bobber using a resin composition, and more particularly, by molding the body portion of the fishing bobber, which is classified as a hole bobber or a rod bobbin, using the resin composition mixed with a synthetic resin and a blowing agent as the material. Manufacture of fishing bobber using resin composition which is excellent in its strength and surface coating property, does not penetrate water at all, and countless pores formed by foaming agent can shape the body of fishing bobber serving as buoyant material. It is about a method.

Commonly used for fishing, it is a signal when a fish bites a lure caught in a fishing needle, that is, a buoy for delivering a fisherman to an angler. It is largely divided into a bore and a rod, which is an egg or a cone. Or a hole through which a fishing line can pass through the center or a specific position of the body having a variety of shapes, such as dish-shaped, bar sticks are literally formed in the shape of a stick.

In addition, the perforated jaw is divided into an assortment and a subterranean fishery, which serves to inform the fisherman in the state of being injured on the surface, and the underwater fishery has a negative buoyancy corresponding to the fishery fishery to offset the buoyancy of the fishery fishery. At the same time to perform a variety of functions, such as controlling the rate of descent of the bait and directing the movement of the bait according to the flow of algae, in the following description, the poop means to say.

In addition, the rod bobbin is typically used when the bobber is viewed horizontally for confirmation of the fisherman as in freshwater fishing, but in the case of sea fishing, it is widely used when the fishing boat is difficult to be identified by the fishing boat or the waves hit hard. It is used, and it is traditionally widely used regardless of sea fishing or freshwater fishing because it is possible to perform simple and easy exchange of the bobber through the snapping rubber or snap-gae inserted into the fishing line.

In order to manufacture such a hole and a stick, the body forming the main portion of the fishing bobber is molded into the shape required as a buoyant material, and then the weight carried out before or after the painting work or the corresponding painting work on the molded body. The final productization work such as attachment of weight (buoyant control lead), bobbins, and bobbers is carried out. The main material of fishing bobber is wood, typically paulownia or balsa, as well as foam or plastic. It is used.

First of all, paulownia has the best buoyancy among solid wood, so it is the most suitable timber that can be used as the body of fishing bobber, and is widely used in freshwater fishing sticks. Such paulownia wood is processed by hand or woodworking lathe processing. After forming the body shape as required, painting is carried out to give a specific color and pattern to the surface of the body, and at the front and rear stages, by connecting parts such as claw saws or crow legs with the body as needed, It will be prepared.

However, the traditional method of manufacturing fishing bobber using paulownia wood is not only expensive because of the large amount of manual work required, and the mass production of automated fishing system is impossible. Since the paulownia tree itself is not very high and the strength of the paulownia tree is not very high, there is a problem in that the coating layer on the surface is easily peeled off or damaged when the fishing bobber collides with the sea rocks.

In particular, in order to manufacture the hole fishing for sea fishing using paulownia wood, in addition to forming the body by hand or woodworking lathe processing, painting the surface and fixing the weight, the pipe is inserted into the fishing line insertion hole through the body. Or insert ceramic rings to block the inflow of water, and in order to obtain sufficient surface strength required for sea fishing bobbers, dozens of cumbersome painting works should be carried out not only for the hole bobs but also for the rod bobbins. There was a problem, and due to this, in case of sea fishing bobber using paulownia, the manufacturing process becomes very cumbersome and the manufacturing cost also increases significantly.

In addition, in the case of fishing bobbers using balsa wood, as with paulownia wood, many manual labors are required for the manufacture of fishing bobbers, and the automated mass production system is not possible. There was a problem that the paint layer was easily peeled off or damaged due to poor adhesion, and the strength of the paint was significantly lower than that of paulownia. There was a problem that can not be used for fishing and is used limited to freshwater fishing.

In addition, the method of forming the body of the bobber with the foam using the foaming solution, such as styrofoam, is to allow the bobbin itself to have buoyancy due to the bubbles generated during the foaming of the foaming liquid, compared to paulownia or balsa wood bobber. While the mass production system is relatively easy to apply, there is a problem in that the surface of the foam is easily dissolved when applying a paint containing a component such as thinner, which makes the painting difficult. Since it is fragile, it is hardly applied to holes and complex shapes, but is applied mainly to simple shapes of sticks.

In addition, since the body of the bobber made of foam has excellent elasticity, but the strength itself is not so high compared to the balsa wood, there is a problem that the paint layer is easily broken or peeled off with the foam even in the slightest impact as the bale wood material. Once the paint layer is peeled off, the foam exposed to the outside not only easily comes off as sand grains, but also easily penetrates the moisture through the exposed part, so that it was difficult to maintain the original shape of the float or its buoyancy.

Finally, the method of injection molding the body of the bobber using the plastic material is easy to mass-produce by the injection mold and the strength of the bobber is relatively good, while the plastic material itself is relatively high in weight. In order to manufacture the bobber with buoyancy, there was a problem in that an empty space was formed separately inside the body, such as a table tennis ball.

As it is necessary to form a separate empty space inside the body as described above, the whole body is not manufactured in one injection process, the cumbersome process of injection molding each part by splitting the body into two or more, and then recombining them In addition, the shape of the injection mold becomes very complicated in the manufacture of the hole bobs through which the fishing line insertion hole penetrates the body, and the operation of precisely joining each injection molded part is also very difficult. There was a problem that the manufacturing cost increases and the defective rate of the product is high.

The present invention has been made in order to solve the above conventional problems, the manufacturing method of fishing bobber using the resin composition according to the present invention, PP (polypropylene), PE (polyethylene), PS (polystyrene), PC (polycarbonate ), ABS resin (acrylonitrile butadiene styrene resin), HIPS (High Impact polystyrene), a synthetic resin which is alternatively selected, and a resin composition mixed with 5-phenyl tetrazole (5-phenyl tetrazole) as a foaming agent. By forming the body part of the fishing bobber, which is classified as a hole bobber or a rod bobbin, by the injection foaming method, its strength is very excellent, water does not penetrate at all, and countless pores formed according to the foaming of the foaming agent serve as buoyancy materials. It is possible to shape the torso of the body, and accordingly to adjust the content of the blowing agent It can be manufactured in this way, the process according to the manufacturing of the fishing bobber can be shortened to the maximum, and the manufacturing cost can be significantly reduced, and the convenience of painting work and the adhesion strength of the paint are improved, which contributes greatly to the improvement of the quality of the fishing bobber, In the case of hole bobs, the buoyancy change due to moisture penetration does not occur even if a separate pipe or ceramic ring is not inserted into the fishing line insertion hole. Let it be the technical problem.

The present invention for achieving the above technical problem, PP (polypropylene), PE (polyethylene), PS (polystyrene), PC (polycarbonate), ABS resin (acrylonitrile butadiene styrene resin), HIPS (High Impact polystyrene) 60-99 wt% of the synthetic resin which is alternatively selected from high strength polystyrene), and a composition mixing step (10) of uniformly mixing 1-40 wt% of 5-phenyl tetrazole (5-phenyl tetrazole) as a blowing agent, and mixing the composition After the step (10), the mixed resin composition is injected into the injection mold (1) at an injection pressure of 10 ~ 140kg / cm ² to the body of the fishing bobber divided into holes or sticks under the temperature conditions of 70 ~ 350 ℃ The injection molding step 20 for injection molding the injection molding step 20, the injection space portion 5 of the injection mold (1) used for injection foaming the body of the bore in the injection molding step 20 of the fishing line insertion hole For molding Forming pin (4) is interposed, and after the injection molding step 20, commercialization, such as painting work on the body of the molded fishing bobber or assembly work of the claw saw and crow legs performed before and after the corresponding painting work Characterized in that step 30 is made.

Hereinafter, the present invention for achieving the above object in more detail as follows.

The resin composition for fishing bobber used in the present invention is composed of a synthetic resin and a foaming agent as its main components, and the synthetic resin imparts strength to the trunk of the fishing bobber and at the same time gives very excellent moldability during injection molding of the fishing bobber body of various shapes. It serves to make the bobber easily manufactured, and the blowing agent forms a myriad of pores inside the body made of synthetic resin to impart a certain buoyancy, and at the same time more efficient to paint the surface of the body with the synthetic resin And improves the adhesion strength with the paint.

The synthetic resin is preferably a thermoplastic resin in consideration of moldability and processability according to injection molding, and most representative examples thereof include PP (polypropylene, Polypropylene), PE (polyethylene, Polyethylene), PS (polystyrene, Polystyrene), ABS resins (acrylonitrile butadiene styrene resin), HIPS (high impact polystyrene), including general purpose synthetic resins such as PC (polycarbonate), including cassette / CD cases or cups or food containers and refrigerator doorliners. Such as various household items).

In addition, each of the synthetic resins listed above may be applied as a single material, such as using an ABS resin and a PC alloy resin or a HIPS and PS mixed resin to give a gloss on the surface of the synthetic resin product. It is also possible to use a mixture of two to three kinds of synthetic resins.

In addition, the blowing agent mixed with the synthetic resin to form the resin composition of the present invention uses 5-phenyl tetrazole (5-phenyl tetrazole), and specific components and specifications of the blowing agent are shown in Table 1.

Table 1: 5-phenyl tetrazole

Item Inspection Method (KJ-3-003) Ingredients and Specifications product name CELLCOM-5PT Molecular Weight 146.15 Molecular formula C ₇ H ₅ N ₄ Exterior form 101 White needles Decomposition Temperature (℃) 107 234-245 Gas generation amount (ml / g) 107 More than 180 Moisture content (%) 102 1 max Disposal Landfill or incineration Fire, explosive Flammable, flammable

The reason why the foaming agent mixed with the synthetic resin is 5-phenyl tetrazole (5-phenyl tetrazole) as described above is that the synthetic resin and the foaming agent are mixed with each other without changing the physical properties of the synthetic resin when injection molding the body of the bobber. This is because the fine particles of the mixed blowing agent are the optimum materials that can form the independent pores at the corresponding positions to generate a predetermined buoyancy required for the bobber body and at the same time maintain the strength of the synthetic resin.

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In addition, when the total weight of the resin composition mixed with the blowing agent and the synthetic resin is 100wt%, the blowing agent is preferably mixed with the synthetic resin within the range of 1 to 40wt%, when the blowing agent is added to less than 1wt%, The minimum negative buoyancy required for the bobber as a bobber, for example, lower than the buoyancy of the submerged bobber such as -B3, causes the bobber to disappear completely into the water, which is undesirable in terms of manufacturing.

In addition, as the amount of the blowing agent increases, the buoyancy generated from the manufactured fishing bobber increases, while the manufacturing cost of the fishing bobber also increases with the increase in the content of the foaming agent, which may be applied to the fishing bobber. Considering the high buoyancy, that is, the buoyancy of about 5 to 7, in the case of the bore with the weight attached, the addition of the blowing agent exceeding 40wt% is not economical and does not have much meaning in terms of manufacturing the bobber.

Hereinafter, the fishing bobber manufacturing method according to the present invention for manufacturing a fishing bobber using the resin composition consisting of the synthetic resin and the foaming agent will be described in detail with reference to the accompanying drawings.

1 is a process block diagram showing a fishing bobber manufacturing method according to the present invention, Figures 2 to 3 (a) and (b) is a process chart showing the step of injection molding the body of various fishing bobber according to the present invention, Reference numerals 2a and 3a, which are not described, indicate the injection nozzles of the resin composition.

As shown in FIG. 1, the method for manufacturing a bobber according to the present invention comprises a step of mixing the composition 10 uniformly mixing the resin composition as a material of the bobber body and injecting the mixed composition into an injection mold to produce the bobber body. Injection and foaming injection molding step 20, and a series of process steps consisting of a commercialization step 30 to finally manufacture the fishing bobber using the molded body.

First, the composition mixing step 10 is PP (polypropylene), PE (polyethylene), PS (polystyrene), PC (polycarbonate), ABS resin (acrylonitrile butadiene styrene resin), HIPS (High Impact polystyrene, high strength Polystyrene) is a step of uniformly mixing 60 ~ 99 wt% of the synthetic resin and 1 to 40 wt% of 5 -phenyl tetrazole (5-phenyl tetrazole) as a blowing agent. The reason for the limitation on the ratio is as mentioned above.

In addition, the mixer (Mixer or Blender) used for mixing the synthetic resin and the blowing agent in the composition mixing step (10) is a vessel-type mixer or mechanical mixer such as mechanical stirring or air stirring, for example, rotary type Various kinds of things can be used, such as attaching a stirring blade to a mixer or applying mechanical or electromagnetic vibrations to a rotating container, but any type of resin that can uniformly mix a synthetic resin and a blowing agent and does not cause a change in its physical properties can be used. You may use it.

After the composition mixing step (10) as described above, as shown in Figures 2 and 3 (a) and (b), respectively, the mixed resin composition at an injection pressure of 10 ~ 140kg / cm ² By injection into the injection mold (1), the injection molding step 20 to injection-foam the body of the fishing bobber under a temperature condition of 70 ~ 350 ℃.

The injection mold (1) used in the injection molding step 20 can be roughly divided into those for forming the body of the hole and the body of the rod, and injecting the gate according to the injection method of the resin composition (6). Method and pin-point injection method can be roughly divided, as shown in Figure 2 shows an embodiment of the injection mold for the production of the body of the bore, and shown in Figure 3 the body of the rod It shows an embodiment of the injection mold for.

2 and 3 (a) show an injection mold of a direct gate injection method, and the one shown in FIGS. 2 and 3 (b) shows an injection mold of a pinpoint injection method. In the former case, the injection pressure of the resin composition 6 can be relatively low. However, the probability that the resin composition 6 will be attached to the surface of the bobbin body formed after the opening of the mold 1 is high. In the latter case, there is a disadvantage in that the injection pressure of the resin composition 6 must be increased, while the mold 1 is opened and formed immediately in the shape required by the Naxichi body.

However, the injection mold 1 shown in Figs. 2 and 3 not only represents a representative and simple embodiment for injection molding the trunk of a fishing bobber such as a hole or a stick, but the main part of the present invention contains a foaming agent. Since the present invention relates to a method for manufacturing fishing bobbins by injection foaming using the resin composition 6, various types of injection molds 1 may be applied according to the type or shape of the fishing bobbin, and the resin composition 6 is injected. It will be appreciated that the nozzle or its injection method can be changed in various ways according to the shape of the injection mold (1).

In order to mold the trunk of a fishing bobber using such an injection mold 1, as shown in FIGS. 2 and 3, respectively, an injection mold 1 consisting of a first mold 2 and a second mold 3 is formed. The resin composition 6 is injected into the injection space part 5 through the injection nozzles 2a and 3a formed in the respective molds 2 and 3 in the closed state. Likewise, the injection space portion 5 for manufacturing the body of the bore has a hole forming pin 4 for forming a fishing line insertion hole therebetween.

At this time, the injection pressure of the resin composition (6) is required to be injection pressure of 10 ~ 90kg / cm ² in the case of the direct gate type, and injection pressure of 30 ~ 140kg / cm ² in the case of the pinpoint type, respectively When the out of the range of the injection pressure in accordance with the injection method of, unmolded portion occurs in a portion of the body of the bobber, or because the surface of the bobber body is molded into a relatively rough shape (Burr) is not preferable.

In addition, the temperature required to inject the resin composition 6 into the injection space part 5 of the injection mold 1 to foam-cure the body of the bobber is preferably in the range of 70 to 350 ° C., but the injection temperature is less than 70 ° C. In this case, the synthetic resin itself cannot be melted, so it is impossible to mold the bobber body. When the injection temperature exceeds 350 ° C, since the blowing agent component is mostly carbonized before the foaming, the buoyancy required from the bobbin trunk is prevented. It is hard to get.

In particular, the optimum injection temperature range that can be applied to the injection molding step 20 according to the present invention is a state in which the injection nozzles 2a and 3a of the resin composition 6 are set at a temperature of about 100 to 350 ° C. In the injection space portion 5, the resin composition 6 is injected into the intermediate temperature at the time of injection is set to 130 ~ 250 ℃ and the final temperature is set to 70 ~ 220 ℃, in this injection molding step 20 Table 3 shows the body of the bobber as the first finished product by buoyancy most widely used.

Table 3: Buoyancy Range of Fishing Bobber Body by Synthetic Resin and Foaming Agent Content

Synthetic resin blowing agent Buoyancy range Greater than 96 wt% Less than 4 wt% 4B or less 96 ~ 95 wt% 4 to 5 wt% 4B ~ 0.6 94 to 93 wt% 6 to 7 wt% 0.6 to 2.0 92 to 91 wt% 8 to 9 wt% 2.0 to 3.0 Less than 90 wt% More than 10 wt% 3.0 or higher

Note) The buoyancy ranges listed in the table are indicated as Bongdol lakes commonly used in the fishing industry.

The reason why the buoyancy width is varied according to the addition amount of the blowing agent as shown in Table 3 depends on the degree of foaming of the blowing agent according to various situations such as the mixing degree of the synthetic resin and the blowing agent and the pressure, temperature and time conditions during injection molding. This is because the difference occurs, it is possible to easily produce a variety of buoyancy bobber even with a constant blowing agent content by using these conditions.

In addition, when the weight is to be coupled to a specific position of the body, such as in a common bore, that is, self-supporting teeth, the weight is inserted and fixed at the corresponding position of the injection space portion 5 in the above-mentioned injection molding step 20. Then, the resin composition 6 may be injected into the injection space 6 so that the weight may be integrally formed with the body at the same time as the injection molding of the bobber body, which is arbitrarily selected in the injection molding step 20. It is to be understood that it can be applied.

After the injection molding step 20 as described above, by using the fishing bobber body molded into the first finished product through the known commercialization step 30 to be able to manufacture the final fishing bobber products that can be marketed to consumers In the case of a bore bobber, the painting work on the body or the assembly of the weight before and after the painting work is carried out. Product assembly step 30, such as the assembly work.

That is, on the basis of the buoyancy range described in Table 3 above, in the case of all floating bobbers (usually buoyancy within the range of -3B to B3), by performing only the painting work on the surface without assembling a separate weight on the molded bobber body One fishing bobber can be completed, and in the case of a common bore bobber (usually buoyancy of 0.5 or more), it is possible to manufacture a buoyancy bobber by attaching or assembling a weight on the bottom of the bobber body.

However, as mentioned above, when the injection weight is integrally molded with the bobber body in the injection molding step 20, as in the all-flow float, only the coating work is performed on the surface of the bobber bobbin molded. Fishing bobber is completed.

In addition, in the case of the rod, by using the injection mold (1), the body of the rod can be molded into one completed shape having a bobbin or a bobbin, and then only the painting work can be performed on the surface thereof, except a bobbin or a bobbin. After forming the body of the rod with the primary, then the front or rear of the tooth saw or the leg may be attached and assembled separately to the body before and after the coating operation.

The fishing bobber according to the present invention finally manufactured through the commercialization step 30 as described above, the fishing bobber body molded into the primary finished product by injection molding is made of a synthetic resin material, its strength is excellent and does not penetrate water at all. , Innumerable pores formed inside the body in accordance with the foaming of the foaming agent is made of a material of excellent function to serve as a buoyancy material to fully satisfy the conditions required for fishing bobber.

In addition, as mentioned above, it is possible to easily manufacture a fishing bobber having various buoyancy using conditions such as the content of the foaming agent for the synthetic resin and the pressure, temperature, and time during injection molding, and in particular, the painting work on the fishing bobber body. Not only can it be carried out very efficiently, but also the adhesion strength between the bobber body and the paint layer can be greatly improved.

This not only serves to improve the adhesion performance of the paint by chemical reaction with the thinner component contained in the paint composition of the resin composition according to the present invention, the surface of the bobber body having a smooth surface in appearance is substantially Since is composed of a myriad of micropore grooves, the paint component soaked into each of the micropore grooves during the painting work hardening and contributes to the improvement of adhesion strength between the body of the bobber and the paint layer.

Therefore, the fishing bobber produced according to the present invention has excellent strength of the fishing bobber body itself and the adhesive strength of the coating layer applied to the surface thereof, as compared to conventional fishing bobbins of foam material such as paulownia, balsa wood or styrofoam. The paint layer is not easily broken or peeled off by the impact, and the surface strength required for freshwater fishing as well as sea fishing can be obtained by only two to five painting operations.

In addition, since the fishing bobber manufactured by the present invention performs a role of buoyant material by the myriad pores formed inside the body, there is no need to form a separate empty space inside the body, as in the conventional plastic fishing bobber, Due to this, only one injection molding process by the injection mold 1 makes it possible to easily manufacture a fishing bobber of various shapes required.

Therefore, as well as conventional paulownia and balsa wood bobber which required a lot of manual work, it is possible to significantly reduce the process steps required for the manufacture of fishing bobbers and to automate the manufacturing process. In addition, it will greatly contribute to the mass production of fishing bobbins and the reduction of their manufacturing cost.

In particular, since the bobber body itself as a primary finished product is a material that does not penetrate water at all, even if it is not equipped with a pipe or ceramic ring in the fishing line insertion hole, As a result, the buoyancy change of the bore does not occur, and thus it is possible to supply a high quality bore with a very low price through minimization of the process step.

As described above, the method of manufacturing fishing bobber using the resin composition according to the present invention has the effect of molding the trunk portion of the fishing bobber, which is roughly classified as a hole bobber or a rod bobber, using the resin composition mixed with a synthetic resin and a blowing agent as its material. Due to this, the strength is very excellent and water does not penetrate at all, and countless pores formed according to the foaming of the foaming agent have the effect of manufacturing the body of the fishing bobber serving as a buoyancy material.

In addition, the blowing agent component constituting the resin composition used in the present invention not only improves the adhesion performance of the paint by chemical reaction with the thinner component contained in the paint, but also consists of a myriad of micropore grooves on the surface of the bobber body By more contributing to the improvement of the adhesion strength of the coating layer, the paint layer is not easily broken or peeled off by various impacts, and the surface strength required for freshwater fishing as well as sea fishing can be obtained by only two to five painting operations. There is.

And, by adjusting the content of the blowing agent and the pressure and temperature and time conditions according to the injection molding, it is possible to easily manufacture various kinds of buoyant fishing bobber, and to produce various types of fishing bobbin body required by only one injection molding. By making it possible, it is possible to shorten the process according to the manufacturing of the fishing bobber to the maximum and to enable mass production according to the automation of the process, thereby greatly reducing the manufacturing cost of the fishing bobber.

In particular, since the bobber body itself as a primary finished product is a material that does not penetrate water at all, even if it is not equipped with a pipe or ceramic ring in the fishing line insertion hole, As a result, the buoyancy change of the bore does not occur, and thus it is effective to supply a high quality bore with a very low price through minimization of the process step.

Claims (2)

delete In the manufacturing method of fishing bobber, Synthetic resin alternatively selected from PP (polypropylene), PE (polyethylene), PS (polystyrene), PC (polycarbonate), ABS resin (acrylonitrile butadiene styrene resin), HIPS (High Impact polystyrene, high strength polystyrene) a composition mixing step (10) of uniformly mixing wt% with 1 to 40 wt% of 5-phenyl tetrazole (5-phenyl tetrazole) as a blowing agent, After the composition mixing step (10), the mixed resin composition is injected into the injection mold (1) at an injection pressure of 10 ~ 140kg / cm ² is roughly divided into a hole or a stick under the temperature conditions of 70 ~ 350 ℃ Through injection molding step 20 of injection molding the body of the bobber, In the injection molding step 20, the injection space portion 5 of the injection mold 1 used to injection-foam the body of the hole jaw so that the hole-forming pin 4 for forming the fishing line insertion hole is interposed. After the injection molding step 20, characterized in that the product is made through the production step 30, such as the assembly work of the claw saw and crow legs performed before or after the painting work on the molded bobbin body or the corresponding painting work. Fishing bobbin manufacturing method using a resin composition to.

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