WO2014065591A1 - Method for manufacturing paper core having resin layer on surface thereof and multi-layer paper core manufactured thereby - Google Patents

Abstract

Provided are a method for manufacturing a paper core and a multi-layer paper core. A method for manufacturing the paper core comprises the steps of: forming an inner core by helically winding a paper band of a set width multiple times; and forming a resin layer on the surface of the inner core by means of extrusion molding. An extrusion method is used to form the resin layer on the surface of the inner core, and the resin layer formed via extrusion on the surface of the inner core does not leave an impression which a paper band does, and does not give rise to a stepped effect which can be generated by the initial stage of winding the film. Thus, a high-quality paper core can be economically mass-produced.

Description

The manufacturing method of the paper pipe which has a resin layer on the surface, and the multilayer paper pipe manufactured using it

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding technology for film winding, and more particularly, to a method for producing a paper pipe having a resin layer on its surface, and a multilayer paper pipe manufactured using the same.

In general, a multi-step process is used to manufacture a paper core used for winding a film or the like. First, several sheets of paper are rolled spirally to form a continuous long tube, which is then cut to the required length. Subsequent surface treatments are then carried out over the secondary and tertiary processes. This is because a large portion of the film to be wound when the surface is uneven cannot be used, and the loss is enormous in the case of an expensive optical film.

Conventionally used surface treatment process is largely divided into polishing and extrusion, it is divided into abrasive paper tube and extruded paper tube according to the difference. Subsequent processes for the surface treatment are performed to remove a large number of paper strips by stacking them slightly, or because there is a gap between the paper strips. The main factors in the quality of paper tubes include the smoothness of the surface and the roundness indicating the degree of circularity of the paper tubes and the straightness indicating the linearity of the paper tubes. In particular, when the branch pipe is used to wind a film used in high precision fields such as the IT field and the optical field as described above, higher roundness, straightness, and the like are required.

The manufacturing process of the abrasive paper tube includes a second process of polishing the surface of the paper tube cut in the first process with a grinding machine, a third process of applying wax to the polished surface, and a fourth process of drying the applied wax. . Since burrs are generated on the surface due to polishing, the burrs are removed and the surfaces are smoothed.

As described above, in the conventional method for manufacturing a paper tube, the paper strips are rolled up in a slightly overlapped state so that the surface becomes uneven. Therefore, in the manufacturing method of the abrasive paper tube, the paper tube is cut to the required size, and then fixed to a grinding machine to grind the outer surface to make the surface flat. As such, since a separate post-processing is required, a large workshop and a lot of manpower are basically required. As a result, the conventional manufacturing method of the abrasive paper was low productivity.

As disclosed in Korean Patent Laid-Open Publication No. 10-1984-0008607, the conventional extruded paper tube manufacturing method does not perform surface polishing, instead of winding the surface paper impregnated with phenol in the secondary process, and then tertiary In the process, the cylindrical heating die is passed to smooth the surface and increase roundness and straightness.

In the conventional method of manufacturing extruded paper tubes, the surface paper must be separately processed and then wound and attached to the cut paper surface. Should go through. In addition, the conventional extruded tube manufacturing method has to go through the process of re-cutting both ends to the length to be shipped after the extrusion process, the yield was bound to fall.

As such, the conventional method has a problem of excessive process time and cost and a low yield since a multi-step process requiring a long time for manufacturing is required to obtain a desired quality.

However, since the core of such a material is generally hard, when the film is rolled, the gap between the adhesive and the core may occur when the winding start end of the innermost layer and the adhesive tape are used. there was.

In addition, a common coil for winding a film uses an adhesive tape to wind the winding end of the film to the core. However, since the core of such a material is generally hard, the step may occur in the corresponding area. do. This step of winding start end deforms the wound film so that a large part of the film is inferior in commerciality and even has to be discarded.

The present invention provides a method for producing a paper tube having a high yield by greatly shortening a process step by extruding a resin layer on a surface of an inner tube manufactured by winding a paper strip.

In addition, the present invention provides a paper tube manufacturing method that can be suppressed as much as possible to form a step on the inner tube surface by forming a resin layer on the surface of the inner tube.

The present invention also provides a multilayer branch tube made through the above-described improved method.

The present invention provides a method for manufacturing a paper tube, the method comprising: winding a paper strip of a predetermined width spirally a plurality of times to form an inner tube; And forming a resin layer on the surface of the inner tube through extrusion molding.

The resin layer may be formed by: applying a resin to the surface of the last paper strip during the forming of the inner tube, and extruding the inner tube to which the resin is applied while heating using a heating mold.

Alternatively, the resin layer may be formed by: passing the inner tube through an extruder to which a resin in a molten state is supplied after forming the inner tube, thereby extruding the resin layer.

Before forming the resin layer, the inner tube can be cut to a desired length, and the resin layer can be formed on the surface of the cut inner tube.

Further, after applying an adhesive or attaching a nonwoven fabric to the surface of the inner tube, the inner tube may be continuously passed through the extruder, and a circular pad may be interposed between the cut inner tube and the inner tube.

The surface of the resin layer may be a cylindrical outer surface, and may be a flat surface or an uneven surface.

The present invention also provides a multilayer paper tube for winding a film, comprising: an inner tube formed by spirally winding a plurality of paper strips; It includes; a resin layer formed on the surface of the inner tube, wherein the surface of the resin layer is a cylindrical outer surface, may be a flat surface or uneven surface.

The resin layer may be a thermoplastic resin or a thermosetting resin.

According to the present invention, there is provided a multilayer paper tube comprising an inner tube formed by winding a paper strip and a resin layer formed on the surface thereof. Such a multilayer paper tube can provide a high quality multilayer paper tube at a relatively low cost by making the inner tube into an inexpensive paper and forming a resin layer on the surface thereof. In particular, since the resin layer is formed by extrusion molding, the entire process can be simplified while providing a multilayer paper tube having high flatness, roundness and straightness. In addition, the application of a soft material such as silicon not only completely solves the problem caused by the initial step wound, but also ultimately increases productivity.

1 is a view schematically showing a paper tube manufacturing method according to a first embodiment of the present invention.

FIG. 2 is a view showing a resin applicator used in the first embodiment shown in FIG.

3 is a view showing a process of extruding a resin layer through a heating mold machine used in the first embodiment shown in FIG.

4 is a view schematically illustrating a paper tube manufacturing method according to a second embodiment of the present invention.

5A to 5C show an extruder used in the second embodiment shown in FIG. 4, FIG. 5A is a schematic plan view, FIG. 5B is a sectional view, and FIG. 5C is a separator that may be employed when using an extruder. Figure is a diagram.

6 and 7 are each a cross-sectional view of the multilayer branch pipe of the present invention.

8 is a flowchart of a paper tube manufacturing method according to the first embodiment of the present invention.

9 is a flowchart of a paper tube manufacturing method according to a second embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Briefly, first, the paper tube manufacturing method of the present invention is to increase the flatness by forming a resin layer on the surface of the inner tube manufactured by spirally winding a plurality of paper strips through extrusion molding. As such, by extruding the resin layer on the surface of the inner tube, a plurality of processes previously performed to increase flatness, roundness, and straightness can be omitted. In particular, forming the resin layer by extrusion molding may be implemented by applying the resin layer to the surface of the inner tube and heat-extruding it or simultaneously applying and extruding in an extruder. This method of the present invention can obtain a very precise flatness and the like while the process is greatly reduced. In addition, when applying a soft resin such as silicone or synthetic rubber can provide a paper pipe that can effectively eliminate the dust caused by the step inevitably occurs at the beginning of the winding of the film.

1, 2, 3, 6, 7, and 8 will be described a method for producing a branch pipe according to a first embodiment of the present invention.

First, a sheet of paper is cut to generate a plurality of paper strips (step (1-1)). Subsequently, a plurality of cut paper strips are spirally wound to form a tubular inner tube 110 (step (1-2)). The process of forming the intermediate product is to cut a wide base paper into a plurality of paper bands using a paper cutting machine (not shown), and then arrange and mount them in the winding machine 1 in order as shown in FIG. It is formed by winding spirally in (11) sequentially. As can be seen in Figure 1, winding each paper strip in a spiral direction to the rotating rod 11 in order and advances it in the advancing direction to the inner tube 110 having the same diameter is produced without interruption. Such advancement is achieved by rotating the inner tube 110, which is formed by winding forward, by rotating the surface of the inner tube 110 obliquely by using the twisted belt 12 as shown. Reference numeral 13 is a rotary drive unit for rotating the rotating rod 11, 14 is a roller for rotating the twisted belt (12). In the drawings, the driving unit for driving the roller 14 is not shown.

Next, a resin is applied to the surface of the inner tube 110 (step (1-3)). In the first embodiment, the resin is applied to the surface of the inner tube 110 by applying the resin on the last paper strip L using the applicator 2 while the above step (1-2) is carried out. Can be implemented. Since the last paper strip L becomes the surface of the inner tube 110 in the process of manufacturing the inner tube 110 through the winding, it is possible to apply the resin to the surface of the inner tube 110 as a whole. As shown in FIG. 1, the resin layer may be applied to the surface of the paper sheet L before the last paper strip L is wound. Of course, the application of the resin is also possible by forming a resin layer on the surface of the inner tube 110 after the last paper strip (L) is wound.

As shown in FIG. 2, the coating device 2 makes the resin introduced through the hopper 22 into a molten state therein through a heating unit provided in the coating device body 21, and through the slit 23. Apply on the last paper strip (L). The last paper strip (L) used at this time may be applied to a synthetic paper such as PE paper to increase the bonding strength with the molten resin.

1 and 8 again, the inner tube 110 coated with the resin on the surface is cut into a desired length using the cutter 3 (step (1-4)).

Subsequently, the cut inner tube 110 is passed through a cylindrical heating mold 4 to heat and extrude the applied resin to form a resin layer 220 (step (1-5)). As shown in FIG. 3, the heating mold 4 includes a heating tube 42 arranged to apply heat to the inner tube 110 and the resin or resin layer 220 introduced therein. The heating coil 42 may be appropriately disposed on the mold body 41, and is provided with a push bar 43 for pushing the inner tube 110 introduced into the mold body 41 to the push bar 43. 110). As the inner tube 110 is extruded as described above, the resin applied to the surface is formed to have a uniform thickness to form the resin layer 220. Cooling lines 44 are disposed at both ends of the mold body 41 of the heating mold 4 to cool the resin layer 220 to be extruded. In this way, the resin applied in the heating mold 4 is extruded while being remelted to form a flat resin layer 220.

The process of polishing the ends can then be carried out.

Hereinafter, a method of manufacturing a branch pipe according to a second embodiment of the present invention will be described with reference to FIGS. 4, 5A, 5B, 6, 7, and 9.

The paper tube manufacturing method according to the second embodiment forms an inner tube 110 by winding a plurality of paper strips, cuts it to the required length, and simultaneously supplies heat to the surface of the inner tube 110 and simultaneously performs heat extrusion. This forms a multilayer pipe having the resin layer 220 on the surface.

This can be implemented through the extruder 5 described below (see FIGS. 4, 5A, 5B, 5C).

First, the inner paper 110 is manufactured by sequentially winding a plurality of paper bands produced by cutting the base paper (step (2-1)) in the winding machine 1 (step (2-2)).

Next, the inner tube 110 is cut into a desired length using the cutter 3 (step (2-3)).

Preferably, the inner tube 110 cut in the second embodiment may be dried for an appropriate time. This drying process is to prevent the generation of fine pores later by removing the moisture remaining in the inner tube (110) in the winding process.

Next, the resin layer 220 is extruded and formed on the surface of the inner tube 110 (step (2-4)). Extrusion of the resin layer 220 is to extrude and simultaneously extrude the resin on the surface of the inner tube 110, it can be implemented using an extruder 5 as shown in Figures 5a and 5b.

For example, as shown in FIGS. 5A and 5B, the extruder 5 includes a mold body 51 having a cylindrical molding space through which the inner tube 110 passes, and a resin, which is a molding material, on the mold body 51. It includes a resin supply unit 52 for supplying in a molten state, and a conveying unit for conveying the inner tube 110 to pass through the mold body (51).

For example, the transfer unit may include one or more roller pairs 53 disposed to surround the outer surface of the inner tube 110 and rotated by a driving unit (not shown) as shown.

The resin supply unit 52 heats the resin introduced through the hopper and supplies the resin to the mold body 51 in a molten state (for reference, the resin supply unit 52 is omitted in FIG. 5B).

The mold body 51 has a cylindrical space through which the inner tube 110 passes, and the molten resin supplied from the resin supply unit 52 is coated on the inner tube 110 surface in the space. When the inner tube 110 passes through the cylindrical space of the mold body 51, the resin in the molten state is applied evenly under pressure between the inner tube 110 and the inner wall of the cylindrical space. Preferably, the mold body 51 is provided with a cooling unit 511 for cooling the resin in the molten state applied to the inner tube 110, so that the applied resin can be quickly cooled to completely maintain the extruded shape. have.

As shown in FIG. 5B, the mold body 51 may have a truncated conical shape in which an inner diameter thereof becomes smaller along the advancing direction. Such a configuration is uniformly formed on the surface of the inner tube 110 while the resin 221 in the molten state in the mold body 51 is extruded in the advancing direction of the inner tube 110. As such, when the inner space of the mold body 51 has a truncated cone shape, support rings 512 for supporting the inner tube 110 to be located at the center of the truncated cone shape may be disposed in front and rear of the mold body 51, respectively. Can be.

As described above, the paper tube manufacturing method according to the second embodiment forms the resin layer 220 on the surface of the inner tube 110 by passing the extruder 5 described above. It is distinguished from the example.

In the first and second embodiments of the present invention, the operation can be performed while continuously passing the inner tube cut by the heating mold 4 or the extruder 5. In this case, as shown in FIG. 5C, the separator 600 may be disposed at the front and rear ends of the inner tubes 100 which are respectively cut. This separator 600 prevents the cut inner tubes 100 from being adhered to each other by molten resin supplied to the surface when passing through the heating mold 4 or the extruder 5. The separator 600 may more preferably include a portion that is inserted into the tube at the front end or the rear end of each cut inner tube 110 and a portion that covers the front end or the rear end as shown in FIG. 5C. .

In the second embodiment, steps 2-3 and 2-4 may be reversed. For example, after the inner tube 100 is formed, the resin layer 220 may be formed on the surface of the inner tube 100 using the extruder 5 without cutting, and then the cutting may be performed to the required length. .

6 and 7 show a cross-sectional view of a multilayer branch pipe manufactured according to the branch pipe manufacturing method according to the first to second embodiments of the present invention described above. As shown, the multilayer paper tube according to the present invention includes a resin layer 220 on the surface of the inner tube 110, and the resin layer 220 has a flat cylindrical surface (FIG. 6) or a curved surface (or irregularities). Surface) (FIG. 7). When such an uneven surface is formed, it can be arranged in whole or in part in the circumferential direction. In addition, the uneven surface may be disposed in whole or in part in the longitudinal direction of the branch pipe.

The resin layer 220 which is extruded in this way does not leave any marks due to the spiral gap between the paper strips when the film is wound up later. In particular, in the case of a material that is ductile after solidification, such as silicon, it will be more effective in solving the problem due to the step marks on the beginning of the winding of the film.

Preferably, as shown in FIG. 7, in order to more effectively absorb the step marks, a pattern of the above-described concave-convex pattern of intaglio or embossing may be repeatedly formed on the circumferential surface of the branch pipe to facilitate the absorption of the winding pressure therein. have. This uneven surface (or curved surface) can be implemented by forming such a pattern on the inner surface of the mold body 51.

The multilayer paper tube of the present invention can provide a high quality multilayer paper tube at an appropriate cost by forming the inner tube 110 by spirally winding a relatively inexpensive paper strip and forming a resin layer 220 on the surface thereof. The resin layer 220 that is extruded can provide very high flatness, roundness, and straightness to the branch pipe, thereby completely eliminating the problem caused by spiral gap marks. Moreover, since the resin layer 220 is formed by extrusion on the surface of the inner tube 110, the entire process can be greatly simplified. This not only shortens the process time, but also greatly reduces the size and manpower of the workplace, thereby greatly reducing the cost.

In addition, in the above-described embodiments, before the resin layer 220 is formed on the surface of the inner tube 110, the resin layer may be attached to the inner tube surface by attaching a PE or PP synthetic paper to increase the adhesion between the resin layer and the inner tube surface. Can be formed.

The resin used in the present invention may be a thermosetting resin or a thermoplastic resin.

As a thermosetting resin, silicones, a polyurethane resin, an epoxy etc. are mentioned as an example.

As thermoplastic resin, polyethylene, nylon, silicone, vinyl chloride resin, polystyrene, ABS resin, acrylic resin, synthetic rubber Etc. can be mentioned.

In addition to the above examples, the resin may be a general purpose resin used in a general extrusion process.

In the foregoing detailed description of the present invention, specific embodiments have been described. However, it will be apparent to those skilled in the art that various modifications can be made without departing from the scope of the present invention.

Claims (7)

As a branch pipe manufacturing method: Winding a strip of paper of a predetermined width in a spiral manner to form an inner tube; And Forming a resin layer on the surface of the inner tube through extrusion molding; comprising, paper tube manufacturing method. The method of claim 1, wherein the resin layer is formed of: During the step of forming the inner tube, the resin is applied to the surface of the last paper strip, The paper pipe manufacturing method which is extruded, heating the resin-coated inner tube using a heating mold machine. The method of claim 1, wherein the resin layer is formed of: After forming the inner tube, the inner tube is passed through the inner tube to the extruder to which the molten resin is supplied, thereby extruding the resin layer. The method according to claim 1, Before forming the resin layer, the inner tube is cut into a desired predetermined length, and the branched tube manufacturing method, wherein the resin layer is formed on the surface of the cut inner tube. The method according to claim 4, After applying an adhesive or attaching a nonwoven fabric to the surface of the inner tube, Continuously passing the inner tube through the extruder, It is interposed between the cut inner tube and the inner tube, the paper tube manufacturing method. The method according to any one of claims 1 to 5, The surface of the said resin layer is an outer surface of a cylindrical shape, a flat surface or a concave-convex surface, The paper pipe manufacturing method. As a multilayer branch pipe for film winding: An inner tube formed by spirally winding a plurality of paper bands; It includes; a resin layer formed on the surface of the inner tube, The surface of the said resin layer is a cylindrical outer surface, a multilayer paper pipe which is a flat surface or an uneven surface.

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