JP3647396B2 - Sheet winding method and apparatus and wound sheet material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, for example, a sheet-like material such as a thermoplastic resin foam sheet continuously fed from an extruder is wound around a plurality of winding shafts provided in a winding device while alternately switching the winding shafts. The present invention relates to a method and apparatus for winding a sheet that is taken up, and an original fabric roll on which the sheet is wound.
[0002]
[Prior art]
For example, a sheet that is continuously fed is wound around a winding shaft attached to one end of a turret arm, and when the sheet is fully wound, the sheet is cut by a cutting device, and the sheet is cut. A continuous sheet winding method and apparatus in which a leading end is guided to an empty winding shaft attached to the other end of the turret arm, and the winding is continued by winding the leading end of the sheet around the surface of the winding shaft. Known (Japanese Patent Publication No. 56-7856, Japanese Patent Application Laid-Open No. 8-34547, Japanese Patent Application Laid-Open No. 2000-344402, etc.).
[0003]
In any case, after cutting the sheet with a cutter, the cut sheet tip is guided along the surface of the empty winding shaft by appropriate guide guiding means, and the sheet leading edge fed from the guide guiding means is By overlapping with the subsequent side of the sheet, it is brought into close contact with the surface of the empty winding shaft. Thereafter, the sheet is continuously wound into a roll shape by the rotation of the winding shaft.
[0004]
FIG. 6 shows an example in which such a winding method is used for producing a thermoplastic resin foam sheet. In this example, the extruder 10 has a circular die 11 attached to the tip, and the extruded foam 12 extruded in a cylindrical shape passes through a cylindrical cooling mandrel 13 and then protrudes from the inside toward the outside. The blade 14 cuts along the flow direction (winding direction). The cut extruded foam sheet 15 passes through the guide rolls 16, 17, and 18, and is taken up by the take-up device 40 including the turret arm device 20 and the cutting device 30, and becomes the original roll R.
[0005]
FIG. 7 shows a portion of the turret arm device 20 of the winding device 40. FIG. 7a shows a state where the extruded foam sheet 15 is wound around the winding shaft A, and the winding shaft B located on the upstream side is in an empty state (that is, standby). The extruded foam sheet 15 is taken up by the winding shaft A through the feed roll 21 and one guide roll 22, and during that time, the guide guide device 24 is in the released posture while the vicinity of the winding shaft B side is disposed. The guide guiding device 24 includes a guide belt 25, and the upstream side 26 is freely changeable between a release position shown in FIG. 7a and a sheet introduction position shown in FIG. 7b. In addition, such a guidance guidance apparatus 24 itself is conventionally known as described in the above-mentioned publication.
[0006]
When the winding shaft A approaches the full winding state, the guide guiding device 24 is in a posture to surround the empty winding shaft B as shown in FIG. 7b, and its upstream end side 26 is located in the vicinity of the feeding side of the feeding roll 21. Become posture. When the winding shaft A is fully wound, the cutting device 30 operates to cut the extruded foam sheet 15. The extruded foam sheet 15a on the downstream side from the cutting position is wound on the winding shaft A, and the original roll R is completed.
[0007]
On the other hand, as shown in FIG. 7c, the tip 15b upstream from the cutting position is fed between the surface of the winding shaft B and the upstream end 26 side of the guide guiding device 24 by the feed roll 21, and the surface of the winding shaft B as it is. After moving along, the guide is guided away from the guide surface of the guide guiding means 24. And the sheet | seat front-end | tip 15b will be in the state overlap | superposed with the surface of the empty winding axis | shaft B with the attitude | position overlapped with the subsequent extrusion foaming sheet | seat 15, and it winds continuously around a winding axis | shaft by the rotation of the winding axis B. It will be taken. After a certain period of time, the guide guidance device 24 assumes the release posture shown in FIG. 7a, and then the turret arm device 20 rotates 180 degrees to prepare the winding shaft A for the next winding.
[0008]
[Problems to be solved by the invention]
FIG. 8 shows a state where the cut sheet tip 15b is wound around an empty winding shaft in the winding device as described above. Due to mechanical limitations, it is very difficult to guide the sheet leading edge 15b until it comes into contact with the winding surface of the winding shaft B by the guide guiding means. After the sheet leading edge 15b is released from the guiding guiding means, FIG. As shown in FIG. 4, the sheet advances in a direction away from the winding surface of the winding shaft B, and collides with the back surface of the subsequent sheet.
[0009]
When the sheet is flexible, no major problem occurs, but when the sheet is a rigid thermoplastic resin foam sheet (for example, a polystyrene resin foam sheet), as shown in FIG. When the leading end of the sheet collides and further entrainment proceeds, the sheet 15 is folded and a wrinkle 29 is generated at the portion 28 where the leading end 15b collides. As shown in FIG. 8c, the crease 29 affects the second, third, and so on sheets. The portion with such a flaw (folded wrinkle) is a defective portion of the sheet and is a target for disposal. For example, when the sheet is a thermoplastic resin foam sheet, the portion cannot be used as a thermoforming sheet for a tray, a container, or the like and is discarded. The occurrence of such a defective portion not only causes an increase in cost, but is not preferable from the viewpoint of environmental conservation during waste disposal.
[0010]
The present invention has been made in view of the circumstances as described above, and when a cut sheet is wound around an empty winding shaft, a defective portion caused by a crease caused by the cutting tip of the sheet is removed. It is an object of the present invention to provide an improved sheet winding method and apparatus, and a wound sheet raw material, which can eliminate the occurrence.
[0011]
[Means for Solving the Problems]
The sheet winding method according to the present invention for solving the above-described problems is achieved by winding a sheet that is continuously fed out while alternately switching the winding axis with respect to a plurality of winding axes provided in the winding device. In the sheet winding method, when the sheet is cut by the sheet cutting device disposed upstream of the winding device when the winding shaft is switched, the leading edge of the cut sheet is directed to the winding surface side of the winding shaft. The process of bending and inclining is performed simultaneously.
[0012]
The sheet winding apparatus according to the present invention includes a plurality of winding shafts, and winds a sheet that is wound by winding the leading end of the cut sheet around the surface of the winding shaft while alternately switching the winding shafts. The apparatus further comprises a sheet cutting device on the upstream side in the sheet feeding direction, and the sheet cutting device further includes means for bending the tip of the cut sheet in a direction toward the winding surface side of the winding shaft to incline the sheet. It is characterized by providing.
[0013]
A raw roll according to the present invention is manufactured by the above manufacturing method or manufacturing apparatus, and is a raw roll that is wound around the surface of a winding shaft by winding the leading end of the sheet, Is wound around the surface of the winding shaft in a state in which it is bent and inclined in a direction toward the winding surface side of the winding shaft.
[0014]
According to the present invention, the leading edge of the sheet to be wound around the empty winding shaft is bent and inclined in a direction toward the winding surface side of the winding shaft. Therefore, when the leading edge of the sheet sent away from the guide surface of the guide guiding means hits the back surface of the succeeding sheet, the phenomenon of “collision with the back surface of the sheet” as in the conventional case does not occur and the sheet is bent. The inclined front end surface slips along the back surface of the succeeding sheet, and the bent front end is guided to the winding surface of the winding shaft as it is, and the winding proceeds. For this reason, no creases occur in subsequent sheets, and the defective portion of the sheet is greatly reduced.
[0015]
In the present invention, the region to be bent and inclined in the direction toward the winding surface side of the winding shaft, that is, the distance from the cutting front end of the sheet to the position where the bending is finished, and the inclination angle need not be constant, and the sheet In consideration of the physical property value, the thickness, the diameter of the winding shaft, etc., the optimum one is finally determined experimentally. In the present invention, any conventionally known winding device can be used except for the cutting device.
[0016]
In the present invention, the cutting surface at the front end of the sheet may be a vertical surface, but in order not to create a gap with the subsequent sheet and to generate a slight dent in the first roll, the cutting surface is It is preferable that the sheet has a slope and the leading end of the sheet has an acute angle.
[0017]
In the present invention, the sheet is not particularly limited, and a state in which the leading end of the sheet is bent and inclined in a direction toward the winding surface side of the winding shaft is continuously in close contact with the empty winding shaft for a certain period of time. However, the present invention is particularly effective when the sheet is a high-rigidity thermoplastic resin foam sheet. In the case of a thermoplastic resin foam sheet, it may be an extruded foam sheet extruded from an extruder equipped with a die at the tip or an extruded foam sheet coextruded in a state where a thermoplastic resin film is laminated on at least one side. .
[0018]
In the case of a thermoplastic resin foam sheet, examples of the thermoplastic resin to be used include polystyrene resin, polypropylene resin, polyester resin, polyethylene resin, polycarbonate resin, methacrylic resin, and polyvinyl chloride resin. These resins may be used alone or in combination of two or more. Of these resins, polystyrene resins are particularly suitable. The reason is that the polyslen-based resin tends to be a resin foam sheet having a hard resin and a high rigidity.
[0019]
Examples of the polystyrene resin include resins produced from monomers such as styrene, methyl styrene, ethyl styrene, isopropyl styrene, dimethyl styrene, paramethyl styrene, chlorostyrene, bromostyrene, vinyl toluene, and vinyl xylene. Further, a styrene homopolymer resin, a copolymer resin, or a ternary or higher copolymer resin may be used. More specifically, homopolymer resins such as polystyrene, styrene-maleic anhydride, styrene-methacrylic acid, styrene-acrylic acid (including acrylic esters), copolymer resins such as styrene-acrylonitrile, acrylonitrile-butadiene- A terpolymer resin such as styrene may be used.
[0020]
Any known foaming agent can be used. Specifically, a decomposable foaming agent, a gas or a volatile foaming agent can be used. These foaming agents may be used alone or in combination of two or more.
[0021]
Examples of the decomposable blowing agent include inorganic decomposable blowing agents such as ammonium carbonate, sodium bicarbonate, ammonium bicarbonate, ammonium nitrite, calcium azide, sodium azide, and sodium borohydride, azodicarbonamide, azobissulfuramide, Azo compounds such as azobisisobutyronitrile and diazoaminobenzene, nitroso compounds such as N, N′-dinitrisopentanemethylenetetramine and N, N′-dimethyl-N, N′-dinitrosotephthalamide, benzenesulfonyl hydrazide , P-toluenesulfonyl hydrazide and p, p′-oxybisbenzenesulfonyl semicarbazide, p-toluenesulfonyl semicarbazide, trihydrazinotriazine, barium azodicarboxylate, citric acid and the like. These foaming agents may be used alone or in combination. Furthermore, a known foaming aid may be added to adjust the decomposition temperature, the amount of generated gas, and the decomposition rate.
[0022]
Examples of gaseous blowing agents include nitrogen, carbon dioxide, propane, n-butane, i-butane, tert-butane, and methyl ether. In addition, gas means here that it is gas at 20 degreeC * 1 atmosphere. On the other hand, examples of the volatile blowing agent include ether, petroleum ether, acetone, pentane, isopentane, hexane, isohexane, heptane, isoheptane, benzene, toluene and the like. In addition to the above, water can be used. These foaming agents may be used alone or in combination. Of the above blowing agents, n-butane, i-butane, nitrogen and carbon dioxide are preferable.
[0023]
Moreover, the foamed sheet by which the thermoplastic resin film was laminated | stacked on the at least single side | surface of the foamed sheet may be sufficient. Examples of the thermoplastic resin film to be laminated include polystyrene resin, polypropylene resin, polyester resin, polyethylene resin, and methacrylic resin. These resins may be used alone or in combination of two or more. By laminating these resin films on the foam sheet, effects such as improvement of the strength of the foam sheet and improvement of printability can be obtained. In particular, it is preferable to use a polystyrene-based resin film and to contain a rubber component in this film resin because an effect of improving brittleness can be obtained.
[0024]
In order to laminate the resin film on the foam sheet, any method such as the method of laminating the resin film on the foam sheet by coextrusion as described above or the method of laminating using a heating roll or adhesive later is used. it can. Moreover, the resin film laminated | stacked on a foam sheet may be provided in the single side | surface of a foam sheet, and may be provided in both surfaces.
[0025]
As a specific method for laminating a resin film, (1) a method called coextrusion in which a foamed sheet and a resin film are merged and laminated and then extruded from a die to obtain a foamed sheet on which the film is laminated, (2) A method of directly laminating the foamed sheet before the resin film extruded from the extruder in the inline or outline is cooled down. (3) The resin extruded from the extruder in the inline or outline is used as a binder in advance. A method of laminating a prepared resin film (which may be pre-printed or plain) on a foam sheet, (4) while heating a pre-prepared resin film (plain or printed product) with a heating roll For example, a method of pressing and laminating a foam sheet can be employed.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a thermoplastic resin foam sheet will be described by way of example. In this example, the entire apparatus is substantially the same as that shown in FIG. 6, and only the configuration of the cutting device 30 provided in the winding device 40 is different. Therefore, in FIG. 1, devices upstream from the cutting device 30 (such as an extrusion device) are omitted, and the turret arm device 20 is described in detail by attaching the same reference numerals to members having the same functions. Omitted.
[0027]
In the example of FIG. 1, the cutting device 30 is a so-called rotary cutter, and has a pair of rotors 31 and 32 that rotate at a higher speed than the feeding speed of the sheet 15 in the same feeding direction as the thermoplastic resin foam sheet 15. A cutting blade 33 is fixed to one rotor 31 in a direction orthogonal to the sheet moving direction, and a sheet receiving base 34 is fixed to the other rotor 32 at a position facing the cutting blade 33. The sheet base 34 is formed with two front and rear ridges 35, 36 extending in the direction of the cutting blade 33. The cutting blade 33 enters the space 37 between the two ridges 35, 36 and heat The plastic resin foam sheet 15 is cut. The configuration of the rotary cutter 30 is conventionally known.
[0028]
In the rotary cutter 30 of the present invention, the height of the two ridges 35, 36 formed on the sheet receiving base 34 is on the rear side in the rotational direction with respect to the ridge 35 located on the front side in the rotational direction of the rotor 32. The protruding ridge 36 is different from the conventional one in that it is higher. FIG. 2 a is a conceptual diagram showing a cutting process by the rotary cutter 30. When cutting with the cutting blade 33, the sheet 15 is pushed up and cut along the ridge 36, and the leading end 15 b of the cut sheet is the rotor 31. The cutting blade 33 enters the space 37 between the two ridges 35 and 36. As a result, the cut surface of the sheet 15 is cut into a slope, and a predetermined region of the cut sheet tip 15b has an inclined posture that is bent upward in the drawing. FIG. 3 is a diagram showing the state in cross section, and in this example, the tip of the thermoplastic resin foam sheet 15 having a thickness of 2.0 mm extends over a length (L) of 10 mm and an angle (M) of about 20 degrees. It is bent and inclined. The cut surface (N) is a slope, and the tip (O) has an acute angle.
[0029]
FIG. 4 shows a state in which the thermoplastic resin foam sheet 15 cut as described above is wound on the empty winding shaft B of the winding device 20. As shown in FIG. 4a, the front end 15b of the thermoplastic resin foam sheet 15 to be wound around the empty winding shaft B is bent and inclined in a direction toward the winding surface side of the winding shaft B. When the thermoplastic resin foam sheet tip 15b fed away from the guide surface of the guide guiding means (not shown in FIG. 4) comes into contact with the back surface of the succeeding thermoplastic resin foam sheet 15, it is bent and inclined. The leading end surface slips along the back surface of the succeeding sheet, and the folded leading end is guided to the winding surface of the winding shaft B as it is, as shown in FIG. Therefore, no crease is generated in the subsequent thermoplastic resin foam sheet 15.
[0030]
FIG. 2 b shows a cutting process according to another example of the cutting device 30. This cutting device and others are so-called guillotine cutters. In this cutter, the cutting blade 33a and the sheet receiving base 34a are both fixed, and the cutting blade 33a ascends into a space 37a formed in the sheet receiving base 34a. The thermoplastic resin foam sheet 15 running on the cradle 34a is cut. In addition, the structure of the above guillotine cutter is conventionally known.
[0031]
In the guillotine cutter of the present invention, a bulging member 38 extending in the entire width direction of the thermoplastic resin foam sheet 15 is fixed to the back surface of the cutting blade 33a, that is, the upstream side in the feeding direction of the thermoplastic resin foam sheet 15. This is different from the conventional one. The bulging member 38 is positioned so that a lower end portion thereof enters the space 37a when the thermoplastic resin foam sheet 15 is cut by the cutting blade 33a. Therefore, when the thermoplastic resin foam sheet 15 is cut by the cutting blade 33a, the front end 15b of the sheet is cut vertically, and a predetermined area of the front end 15b of the sheet is pushed up by the bulging member 38 and is directed upward. It becomes a tilted posture bent.
[0032]
FIG. 5 shows a state in which the thermoplastic resin foam sheet 15 cut using the cutting device shown in FIG. 2B is wound on an empty winding shaft B of the winding device 20, and corresponds to FIG. As shown in the figure, since the tip 15b of the thermoplastic resin foam sheet 15 is a vertical surface, the bent tip and the succeeding thermoplastic resin foam sheet 15 are somewhat stepped as compared to the case shown in FIG. In such a state, the sheet is wound around the winding shaft B, and a slight gap is formed between the succeeding thermoplastic resin foam sheets 15 but no crease is generated. There is a slight dent on the first volume.
[0033]
In addition, in the original fabric roll made by the above method or apparatus, it becomes possible to greatly reduce the unusable portion of the thermoplastic resin foam sheet due to the crease that has been generated at the time of winding on the winding shaft. The utilization rate of the plastic resin foam sheet is improved.
[0034]
【Example】
Commercial polystyrene resin (G-9305 (MI = 1.7 manufactured by A & M)) 100% by weight butane gas (isobutane / normal butane = 50/50) 2.3 parts by weight as a foaming agent, powder as a bubble regulator Using a master batch product equivalent to 0.85 parts of talc (DSM-1401A (manufactured by Denki Styrol Co., Ltd.)), melt-kneading in an extruder, adjusting the resin temperature to 160 ° C. with a circular die having a diameter of 170 mm, thickness 2 A polystyrene-based resin foam sheet having a size of 0.2 mm and a magnification of 9.2 was obtained.
[0035]
The foamed sheet was cut and wound with the apparatus shown in FIGS. In either case, the tip of the thermoplastic resin foam sheet was bent upward at an angle of about 20 degrees over a length of about 10 mm. After winding on an empty winding shaft to make a roll, the sheet was rewound and the state of the sheet near the winding shaft was observed. In the apparatus of FIG. 2a, since the cut surface was a slope and the tip was an acute angle, neither dent nor crease was observed on the first roll sheet. In the device of FIG. 2b, since the cut surface was vertical, a slight dent was observed on the inner surface of the first roll, but no crease was observed.
As a comparative example, the bulging member 38 was removed from the apparatus of FIG. In this case, folding lines were observed up to the fifth volume.
[0036]
【The invention's effect】
According to the present invention, it is possible to eliminate scratches (folded wrinkles) that have occurred in the sheet area at the beginning of winding when the sheet is wound on a conventional winding shaft, and as a result, the effective utilization rate of the sheet of the original roll is improved. Therefore, it is possible to reduce costs and labor required for waste disposal.
[Brief description of the drawings]
FIG. 1 illustrates an example of an apparatus for carrying out a method according to the present invention.
FIG. 2 is a diagram illustrating a cutting process by two different cutting devices in an apparatus for carrying out the method according to the present invention.
FIG. 3 is a diagram illustrating a state of a sheet after being cut by a cutting blade.
FIG. 4 is a diagram illustrating a state in which a sheet is wound around a winding shaft according to the present invention.
FIG. 5 is a diagram for explaining another state of winding the sheet on the winding shaft according to the present invention.
FIG. 6 is a diagram for explaining a thermoplastic resin foam sheet manufacturing and winding device.
FIG. 7 is a view for explaining a sheet winding procedure in the winding apparatus.
FIG. 8 is a view for explaining a winding state in a conventional winding device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Extruder, 15 ... Sheet (thermoplastic resin foam sheet), 15a ... Sheet tip, 20 ... Turret arm device, 30 ... Cutting device, 40 ... Winding device, 33, 33a ... Cutting blade, 34, 34a ... Sheet Receiving base, 35, 36 ... ridges, 37, 37a ... space, 38 ... bulging member, R ... original fabric roll, A, B ... winding shaft

Claims (5)

  In a winding method for a sheet that is wound while alternately switching the winding axis with respect to a plurality of winding axes provided in the winding device, the sheet that is continuously sent out is changed when the winding device is switched. When cutting a sheet by a sheet cutting device arranged upstream, winding the sheet is characterized by simultaneously bending and inclining the tip of the cut sheet toward the winding surface side of the winding shaft. Method.   2. The sheet winding method according to claim 1, wherein when the sheet is cut, a process for making the leading end of the sheet an acute angle is also performed simultaneously.   A sheet take-up device that is provided with a plurality of winding shafts and winds by winding the leading end of the cut sheet around the surface of the winding shaft while alternately switching the winding shafts, on the upstream side in the sheet feeding direction A sheet winding apparatus comprising: a sheet cutting device, the sheet cutting device further comprising means for bending and tilting a leading end of the cut sheet toward a winding surface side of the winding shaft.   4. A sheet winding apparatus according to claim 3, further comprising means for making the leading edge of the sheet an acute angle. A roll of raw material wound around the surface of the winding shaft by winding the tip of a thermoplastic resin foam sheet. The thermoplastic resin foam sheet has a sloped cutting surface at the tip, and the sheet tip is an acute angle. The thermoplastic resin foam sheet is wound around the surface of the winding shaft so that the cut surface of the thermoplastic resin foam sheet faces the winding surface of the winding shaft. Is wound on the surface of the winding shaft in an inclined state.

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