KR20000004871A - Plastic reel - Google Patents

Abstract

PURPOSE: A plastic reel is provided for a high intensity, an easy conveyance, working and recycling of natural resources. CONSTITUTION: The plastic rill comprises:a cylinder typed collar as a winding up core and a disk as a flange which are manufactured with a plastic material having a pulp; a projected part hung with a ring of which outer diameter is shorter than the inner diameter of the collar, formed on the side face of the disk; a connecting nail for connecting the disk with the collar, formed on the projected part that its connecting part is hung with the ring; a connecting hole formed around the edge of the collar.

Description

Plastic reel

The present invention relates to a plastic reel formed by injection molding a pulp-containing plastic material and a method for producing the same.

Reels wound with linear materials have been used in many technical fields for automated machines, such that the linear materials are reversely wound by an automated machine. Such reels are usually made of metal, plastic, paper, and the like. However, plastic or paper reels have typically been used because linear materials wound on reels are often disposed of in reels after being used at the factory. Plastic reels are expensive to manufacture and produce many toxic gases when incinerated. In addition, in the plastic reel, carbon is put as an antistatic agent in order to reduce the surface electrical resistance in terms of reducing the static charge. However, it was difficult to control the amount of carbon mixed.

On the other hand, although paper reels are cheap to manufacture, they have the disadvantage of being weak in strength. Moreover, since dust is easy to generate | occur | produce, there existed a restriction in being used in clean places, such as a semiconductor manufacturing plant. Paper reels were normally incinerated after use. However, there is a problem that an incineration plant is required, and dioxin is produced due to pulp combustion.

It is an object of the present invention to provide a plastic reel and a method of making a plastic reel, which provides a number of advantages: a large scale production is allowed by injection molding pulp containing plastic materials that provide high strength; Transport and assembly work is easy; Plastic reels have self-combustion properties that do not require a relatively large incineration plant for post-use disposal, thus inhibiting the production of dioxins to a low extent; The paper used can be used to reduce manufacturing costs, thus achieving the purpose of resource recycling.

According to one aspect of the invention, there is provided a plastic reel comprising a cylindrical collar as a winding core and a disc as a flange mounted on both sides of the cylindrical collar, wherein the collar and disc are made of pulp-containing plastic material; On the sides of each disc form an annular protrusion, the outer diameter of which is smaller than the inner diameter of the collar; Joining discs with the collar are formed at each annular protruding portion located near both edges of the collar.

According to another aspect of the present invention, there is provided a method of making a plastic reel comprising a cylindrical collar as a winding core and a disc as a flange mounted on both sides of the collar, wherein the cylindrical collar and disc are pulp materials and paper pulp composed of a polymer. Formed separately by injection molding, forming an annular protrusion on the side of each disc, the outer diameter of which is smaller than the inner diameter of the collar, and on each annular protrusion located near both edges of the collar. The disk is connected to the collar by forming a connection site.

In the drawing;

1 is a perspective view of a plastic reel embodiment according to the present invention;

FIG. 2 is a side view of the plastic reel shown in FIG. 1; FIG.

3 is a longitudinal sectional view of the plastic reel shown in FIG. 1;

4A is a cross-sectional view showing a connection state between a connection hole and a coupling nail;

4B is a plan view showing a relationship between a connecting hole and a connecting nail;

5 is an enlarged front view showing a support shaft insertion hole formed in the center portion of the disc;

6 is an enlarged cross sectional view showing a disk and an essentially formed disc;

7 is a cross-sectional view showing an embodiment of a plastic reel formed so that the ring-shaped protruding portion has a U-shape in cross section;

8 is a front view of an embodiment of a collar with slits formed through the connecting holes and both ends of the collar;

9A is an enlarged cross sectional view showing a connection state between a connecting hole of a collar and a connecting nail of a disk, shown in FIG. 8;

9B is a plan view showing a relationship between a connecting hole and a connecting nail.

A preferred embodiment of the plastic reel according to the present invention will be described with reference to the drawings.

1 to 6 show an embodiment of the plastic reel of the present invention. The plastic reel includes a disc 2 as a flange that attaches collar 1 as a cylindrical winding core to both sides of the collar 1. The collar 1 and the disc 2 are formed by injection molding a plastic material containing pulp (hereinafter referred to as pulp-containing plastic material).

It is preferable to use paper pulp as the pulp. In particular, the use of used paper pulp recovered from discarded newspapers is useful in terms of resource recycling. As a method of producing used paper pulp, for example, the used paper is called water; Remove impurities; An additive is added to prevent the connection between the paper fibers of the pulp, followed by dehydration of the pulp to control the water content in the pulp material. The pulp material is then placed in a pellet maker to form the pelletized pulp material. The pelleted pulp material is mixed with a polymer such as polypropylene, polyvinyl chloride, and the like. After kneading the mixture, the material is placed in an injection molding machine to form the collar and the disk separately. The collar 1 and the two discs 2 thus obtained are joined to form a plastic reel.

Optionally, the pelleted pulp material and the pelletized plastics material can be premixed and dissolved, and the dissolved mixture is put into a pellet maker to obtain a pelleted mixture of pulp and plastic. The pelletized material can then be dissolved again and the melted material is injection molded to form the collar 1 and disc 2 separately.

The ratio of pulp and polymer is preferably such that the pulp is 30 to 70% by weight. In the range of the above mentioned ratios, plastic reels have high tensile strength, high bending strength and self-burning properties. The self-burning nature means that the plastic reel can be easily burned by igniting a lighter such as a match.

If the proportion of pulp is less than 30% by weight, the droplets of dissolved plastic that occur during the burning of the plastic reel solidify and it is difficult to obtain complete combustion. On the other hand, if the proportion of pulp exceeds 70% by weight, the fluidity of the pulp-containing plastic material during injection molding decreases. In addition, there is a risk that the pulp-containing plastic material burns out in the course of heating the material before injection molding. When producing collars and discs using the range of ratios mentioned above, injection molding is carried out under a pressure of 700 kg / cm ² to 1,200 kg / cm ² , preferably 800 kg / cm ² to 900 kg / cm ² , And from 160 ° C. to 200 ° C., preferably from 175 ° C. to 180 ° C.

A circular connecting hole 3 is formed as a cylindrical winding core with an angle difference of 90 ° at positions near both end holes of the collar 1. Each flange as a flange has a substantially octagonal shape, where the opposite side to the center of disk 2 should have at least a linear line. In addition, ribs 4 are formed on both sides of each disc 2 to increase the mechanical strength of the discs. As shown in FIG. 3, on the side of each disc 2, an annular protrusion 5 is formed, the outer diameter of which is smaller than the inner diameter of the collar 1. Forming each disc 2, the wall thickness is gradually reduced from the bottom of the annular overhang towards the outer surface of the disc 2. A plurality of connecting nails 6 having unused ends, each provided with jaws or clasps, are formed in the looped protrusion 5, and the plurality of connecting holes 3 correspond to both ends of the collar 1 to correspond to the connecting nails 6. Form at a location near the hole. Each connecting nail 6 and each circular connecting hole 3 constitutes a connecting portion as shown in FIGS. 4A and 4B.

As shown in Fig. 2, support shaft insertion holes 7 are formed in the center portion of each disc 2. As shown in FIG. 5, four clearance grooves 8 having a semicircle shape around the support shaft insertion hole 7 are formed to provide a generally round cross shape.

A gate 9 into which the pulp-containing plastic material is injected is formed in the concave portion of the clearance groove 8, and the gate is represented by a dotted line. Gate 9 is removed after injection molding. Since the gate is formed in the concave portion, the operation of removing the gate is easy. For the purpose of increasing the strength of the portion around the support shaft insertion hole 7, the wall thickness around the support shaft insertion hole 7 and the clearance groove 8 is increased to form a thickened wall portion 14. Further, as shown in FIG. 2, six finger holes 10 having an elliptical shape are formed around the support shaft insertion holes 7. Finger hole 10 attaches disk 2 to collar 1 and facilitates the assembly operation of handling plastic reels.

A circular hole 11 is formed in each of the disks 2 located outside the ringed protruding portion 5. Insert the end of the thread 12 for connecting the weight end of the linear material wound on the plastic reel to a position near one of the circular holes 11 and the other end of the thread 12 through the circular hole 11 To the side. The material for the yarn 12 is the same as the material for the disc 2, for example polypropylene. As shown in FIG. 1, in the outer surface portion of each disc 2, a number of holes 13 are formed for mounting the leading end of the linear material.

In the manufacture of disc 2 by injection molding, the pulp-containing plastic, as indicated by the dashed line in FIG. 5, is provided with four gates 9 in the clearance groove 8 (which is cross-shaped, around the support shaft insertion hole 7). The material is injected radially through the gate 9 into the metallic die to form the disc 2. That is, the pulp-containing plastic material is ejected from the central portion of the disk 2 having a plate shape through a plurality of gates, whereby the injected material flows uniformly within the metallic die and is molded with high mechanical strength, designed as desired. The product can be obtained.

Gate 9 must be removed after injection molding. However, since the gate is formed so as not to interfere with the support shaft insertion hole 7 for inserting the rod for supporting the plastic reel, it is not necessary to completely remove the burn marks on the gate 9. In addition, as shown in FIG. 2, six elliptical finger holes 10 are formed, so that a path of the spinning yarn for the injected material can be formed, which allows the injected material to spread uniformly for a short time. As a result, disc 2 with high mechanical strength can be obtained.

The plastic reel of the present invention has a three-piece structure in which the collar 1 and the disc 2 are formed separately by injection molding. Thus, they can be transported in a decomposed and overlaid state, thereby reducing the overall volume during transport and reducing the risk of damaging the components during transport.

In assembling the collar 1 and the disc 2, first the collar is supported vertically, the disc 2 is held horizontally above the collar 1 and attached to the collar 1 by pushing the looped protrusion 5 into the collar 1 inner diameter. The connecting nail 6 formed on the hooked protruding portion 5 can be fitted with the circular connecting hole 3 formed in the collar 1 as shown in Fig. 4A, thereby securing a rigid connection. The other disc 2 can be mounted on the collar opposite the collar in the same manner as above.

As shown in Fig. 4B, each connection hole has a circular shape. Therefore, the concentration of stress loaded by the coupling nail 6 can be reduced.

If a variety of collars 1 with different widths are prefabricated, plastic reels with the required widths can be assembled at the factory. Since the corrugated flesh 4 is formed on both surfaces of each disc 2, many assembled plastic reels can be stacked so that the concave and protruding portions meet, and even when transporting them, the stacked plastic reels can reduce the possibility of slipping. Can be.

When winding linear materials such as wires, cords, belts, semiconductor support carriers on the plastic reel of the present invention, the unwinded end of yarn 12, the other end that is firmly attached to disk 2, is wound. Secure firmly to the leading end of the material. Since the other end of the chamber 12 is firmly attached to the disk 2 in the injection molding, it is not necessary to fix the chamber 12. Therefore, the work of winding the linear material is easy and a reliable connection can be obtained.

When the plastic reel wound with linear material is mounted on the automated machine, the operation is easy because the finger-like object of the manipulator can be inserted into the hole 10 for inserting the finger-like object formed on the disc 2. In addition, the surface of the hole 10 for inserting a finger-like object is made up of a thick wall portion that has a rounded corner portion and provides sufficient strength to the hole 10 for inserting a finger-shaped object as well as protects the finger-shaped object of the manipulator. . Further, each disc 2 typically has an octagonal shape formed such that one or more pairs opposite the surface of the disc 2 have linear lines, thereby preventing the plastic reel from rolling even when placed on an inclined plane.

As described above, the pulp-containing plastic material is contained in the plastic reel, the paper fiber is contained as a reinforcing material in the pulp function, and the tensile strength and the pulling strength of the plastic reel of the present invention are only used for the plastic material. Higher than the formed plastic reel.

The physical properties of the plastic reel formed by injection molding a pulp-containing plastic material consisting of 50% by weight of paper pulp and 50% by weight of polypropylene were measured to have a tensile strength of 452 kg / cm ² ; The bending strength is 737 kg / cm ² , it is known to ignite easily with one match and to be free of droplets of dissolved material during combustion. On the other hand, when only polypropylene for injection molding is used, the tensile strength is 240 kg / cm ² ; The bending strength is 370 kg / cm ² , and it is known that the combustion requires a very strong ignition force, resulting in droplets of dissolved material.

As described above, disc 2 has corrugated flesh 4 and thick wall portion 14 and is formed such that the wall thickness of disc 2 gradually decreases from the bottom of the annular protruding portion 5 toward the outer surface portion of disc 2. do. Thus, when a load is loaded on the outer surface portion of disc 2, the loaded stress is evenly distributed from the looped protrusion 5 to the outer surface portion, thereby significantly reducing the risk of breakage due to bending forces or collisions. have. If either disk 2 is broken, the broken disk can be easily replaced by releasing the connecting projection 6 from the connecting hole 3 as shown in FIG.

In addition, the proportion of paper pulp in the mixed material to be injected is in the range of 30 to 70% by weight, and the plastic reels can be easily burned without the need for large combustion equipment. In addition, the plastic reel of the present invention has its own combustion properties. Therefore, it can be easily ignited with an igniter and there is no possibility of solidifying the molten plastic material. In addition, it is possible to significantly reduce the production of dioxins obtained by burning paper pulp and to obtain complete combustion. The ash remaining after combustion is in the form of a powder, which is easy to dispose of and has a slight chance of producing blackish ash, such as burning paper.

In addition, when the plastic reel is disposed of in the ground, the paper reel contains paper pulp, so that the plastic reel can be quickly decomposed. In addition, since the paper pulp itself is lost due to decomposition, it is easy to dispose of. In addition, since the yarn 12 is formed of the same material as the collar 1 and the disc 2, it is not necessary to separate the yarn 12 from the body of the plastic reel for resource recycling.

For the purpose of imparting antistatic performance to the plastic reel, the collars and discs can be injection molded under conditions of increased melting temperature of the pulp-containing plastic material. In this case, the pulp fibers in the material are partially burned to provide a carbonized state, which can reduce the electrical resistance of the plastic reel. In this case, conventional control operations are unnecessary for mixing carbon in the pulp-containing plastic material.

7 shows another embodiment of the plastic reel of the present invention. In the embodiment shown in FIG. 7, the annular projecting portion 5 of the disc 2 inserted into the hole of the collar 1 is formed so that the cross section has a U shape. The U-shaped structure is used for disc 2 in consideration of the following advantages. In other words, when the plastic reel accidentally falls and the disk 2 fits on the floor, a large stress is concentrated around the annular projection 5 mounted in the hole of the collar 1. However, if the cross section of the protruding portion 5 with rings is formed to have a U-shaped shape, the U-shaped portion is deformed to absorb the stress and thus prevent the portion from being broken.

8 and 9 show yet another embodiment of the present invention, wherein slit 15 is formed to connect each of the circular connecting holes 3), which are both end holes of collar 1 with each of the unused end portions of collar 1 It is formed at angular intervals of 90 ° in the vicinity. The slit 15 makes it easy to insert the connecting protrusion 6 into the connecting hole when the connecting protrusion 6 formed on the hooked protrusion 5 in the assembly of the collar 1 and the disk 2 is pushed into the connecting hole 3.

In the embodiment shown in FIG. 5, four clearance grooves 8 are formed around the support shaft insertion holes 7. However, an appropriate number of clearance grooves such as three or five grooves can be formed.

The present invention provides a plastic reel and a method for producing a plastic reel, which provides many advantages: a large scale production is allowed by injection molding a pulp containing plastic material that provides high strength; Transport and assembly work is easy; Plastic reels have self-combustion properties that do not require a relatively large incineration plant for post-use disposal, thus inhibiting the production of dioxins to a low extent; The paper used can be used to reduce manufacturing costs, thus achieving the purpose of resource recycling.

Claims (2)

A plastic reel comprising a cylindrical collar as a winding core and a disc as a flange mounted on both sides of the cylindrical collar, the plastic reel comprising: making the collar and the disc from a pulp containing plastic material; A hooked protrusion is formed on the side of each disk, the outer diameter of which is smaller than the inner diameter of the collar: a connecting portion is formed on each hooked protrusion located near both edges of the collar to connect the disk to the collar. Plastic reel, characterized in that. A method for producing a plastic reel comprising a cylindrical collar as a winding core and a disc as a flange mounted on both sides of the collar, wherein the cylindrical collar and the disc are separately made by injection molding using a pulp material composed of a polymer and paper pulp. Forming an annular protrusion on the side of each disc, the outer diameter of which is smaller than the inner diameter of the collar, and forming a connecting portion on each annular protrusion located near both edges of the collar to form a disc with the collar. Connecting.