KR20170140268A - Method and winding of web material - Google Patents

Method and winding of web material Download PDF

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Publication number
KR20170140268A
KR20170140268A KR1020177032687A KR20177032687A KR20170140268A KR 20170140268 A KR20170140268 A KR 20170140268A KR 1020177032687 A KR1020177032687 A KR 1020177032687A KR 20177032687 A KR20177032687 A KR 20177032687A KR 20170140268 A KR20170140268 A KR 20170140268A
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South Korea
Prior art keywords
web material
compressive stress
compressive
strain
cushioning material
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KR1020177032687A
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Korean (ko)
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KR101969979B1 (en
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요시히데 이노우에
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가부시키가이샤 미카타
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/18—Constructional details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/11—Polymer compositions

Abstract

A method for winding a web material according to the present invention comprises the steps of attaching an end of a web material (30) to a cushioning material (20) formed on the outer peripheral surface of a core body (10) including a winding process, and the buffer material, a compressive stress in the compressive strain of 20% made of a soft foamed resin 0.02㎫ or less, the thickness of the buffer material (t 1) is, when the thickness of the web material to 2 t, 0.2≥ t is set to 2 / t 1 ≥0.1, the cushioning material is the compressive stress in the compressive strain α% (20≤α≤60) with σ a and compressive strain (α + t 2 / t 1 × 100) compression in% When the stress is σ b , σ b / σ a ≤ 6.

Description

Method and winding of web material

The present invention relates to a winding method for winding a web material on a core and a core for winding the web material.

In order to wind a web material such as a film or a sheet in a roll shape, a method is generally used in which a tip end of a web material is fixed to the outer surface of a cylindrical core by an adhesive or the like, and then the core is rotated and wound.

However, since the surface of the winding core is generally rigid, when a plastic material having a plasticity is wound in a roll shape, a step is generated between the outer peripheral surface of the winding core and the end portion of the wound web material, Irreversible deformation occurs. Since the same deformation is transferred to the web material which is wound around the deformed web material, irregular step marks such as deformation are generated in the web material over several to several tens of cycles after the beginning of winding. The occurrence of such a step mark causes the flatness of the web material to be lowered, resulting in a loss of the product and an increase in cost.

In order to reduce the occurrence of such stepped marks, Patent Document 1 discloses a technique for forming a buffer material on the outer circumferential surface of the winding core. According to this technique, since the end of the wound web material sinks into the cushioning material, the step due to the thickness of the web material is alleviated, so that the step trace can be reduced.

Patent Document 1: JP-A-2005-1624378

However, in the conventional method, even if a soft material is used as the buffer material, the difference in compressive stress when the web material is wound around the winding core at the end portion of the wound web material, as described later, (Hereinafter referred to as " step difference caused by the compressive stress difference ") is different from the step difference caused by the step difference of the conventional web material on the surface of the web material It is becoming an issue.

The main object of the present invention is to provide a method of manufacturing a web material by winding a web material on an outer circumferential surface of a web material with a cushioning material as a countermeasure countermeasure measure caused by an end step of the web material, This is to reduce the step trace due to the compressive stress difference, which is a new problem occurring on the surface.

A method for winding a web material according to the present invention is a winding method for winding a web material on a core by winding a web material on an outer circumferential surface of the core body and attaching an end of the web material on the cushioning material, , with adding a tension to the web material made of a soft foamed resin is not more than 0.02㎫ compressive stress in comprising a step of winding the winding core body, and the buffer material is compressed to 20% strain, and the thickness (t 1) of the buffer material is when the thickness of the web material is wound to t 2, 0.2≥t is set to 2 / t 1 ≥0.1, the cushioning material is the compressive stress-strain curve from the (stress-strain curve), compressive strain α% (20≤α≤ the compressive stress at 60) with σ a and, when the compressive stress of the compressive strain in the (α + t 2 / t 1 × 100)% by σ b, characterized in that the σ b / σ a ≤6.

In a preferred embodiment, the thickness t 1 of the cushioning material is set to 0.15? T 2 / t 1? 0.1 when the thickness of the wound web material is t 2 , and the cushioning material has a compressive stress- , when a compressive stress in the compressive strain α%, and the compressive stress in (20≤α≤65) with a compressive strain σ (α + t 2 / t 1 × 100)% by σ b, σ b / σ a ≪ / RTI >

According to the present invention, when a web material is wound around a winding core having a buffer material as a countermeasure material countermeasure caused by an end step of a web material on the outer circumferential surface, a step trace due to a difference in compressive stress occurring on the surface of the web material at the end of the wound web material Can be reduced.

1 (a) to 1 (d) are enlarged cross-sectional views schematically showing a step of winding a web material on a conventional core.
2 is a graph showing a compressive stress-strain curve of a conventional cushioning material.
Fig. 3 is a cross-sectional view schematically showing a construction of a preferred embodiment of the present invention.
4 (a) to 4 (e) are enlarged cross-sectional views schematically showing a step of winding a web material on the core of the embodiment of the present invention.
5 is a graph showing a compression stress-strain curve of a cushioning material according to an embodiment of the present invention.
6 is an enlarged graph showing a part of the compressive stress-strain curve of the cushioning material of the embodiment of the present invention.
7 is a photograph of the surface of the cushioning material when a coin is pressed on the surface of the cushioning material used in the embodiment of the present invention and the cushioning material is set to a compression strain of 85% and then the coin is removed.

Before explaining the embodiment of the present invention, a description will be given of how the present invention is supposed to be performed.

1 (a) to 1 (d) are enlarged cross-sectional views schematically showing a step of winding a web material on a conventional core. The winding core has a cylindrical core body and a cushioning material formed on the outer circumferential surface of the core body. 1 (a) to 1 (d), only the cushioning member 20 formed on the outer circumferential surface of the core body is omitted and the core body is omitted. The curvature of the surface of the buffer material 20 is omitted.

Fig. 1 (a) shows a state in which the end portion of the web material 30 is attached to the surface of the cushioning material 20. Fig. Here, the case where the thickness of the buffer material 20 is 500 mu m and the thickness of the web material 30 is 100 mu m will be described as an example.

1 (b), when the web material 30 is wound around the cushioning material 20 while applying tensile force to the web material 30, if the cushioning material 20 is made of a soft material, 30 sink into the cushioning material 20 by that thickness. At this time, the thickness of the region 20a of the cushioning material 20 in which the web material 30 sinks is 400 mu m (compression strain is 20%). However, since the compressive strain of the cushioning material 20 is elastically deformed, the cushioning material 20 in contact with the end portion of the web material 30 is pulled by the sinking of the web material 30, The cushioning material 20 in a region slightly spaced from the end portion of the cushioning material does not sink. As a result, as shown in Fig. 1 (b), the groove portion 40 is formed on the surface of the cushioning material 20 in contact with the end portion of the web material 30 of the cushioning material 20. Then, the web material 30 receives a compressive stress (? 1 ) at a compressive strain of 20% from the buffer material 20.

The web material 30 sinks further into the cushioning material 20 when the second-layer web material 30B is further wound on the first-layer web material 30A as shown in Fig. 1 (c). Assuming that the thickness of the region 20a of the cushioning material 20 in which the overlapped portion of the first-layer web material 30A and the second-layer web material 30B is 200 mu m, the compression strain of the region 20a is 60%. On the other hand, the thickness of the region 20b of the cushioning material 20 in which the second-layer web material 30B sinks is 300 mu m, and the compression strain of the region 20b is 40%. Therefore, the web material 30 at the portion where the first-layer web material 30A and the second-layer web material 30B overlap is subjected to the compressive stress (? 3 ) at the compression strain of 60% from the buffer material 20 . On the other hand, the web material 30 of only the second-layer web material 30B receives the compressive stress (? 2 ) from the cushioning material 20 at a compression strain of 40%.

However, as shown in Fig. 2, the cushioning material 20 generally has a characteristic that the compressive stress-strain curve increases and the compressive stress increases when the compressive strain increases. Therefore, as shown in Fig. 1 (c), the compressive stress? 3 (the compressive strain 60 (compressive strain)) of the web material 30 in the portion where the first-layer web material 30A and the second- %) And the compressive stress? 2 (compressive strain 40%) received by the web material 30 only of the second-layer web material 30B. Therefore, the web material 30 of only the second-layer web material 30B is easier to sink than the web material 30 of the overlapping portion of the first-layer web material 30A and the second-layer web material 30B . As a result, as shown in Fig. 1 (c), at the end of the first web material 30A, the surface of the first web material 30A in the region 20a and the surface of the first web material 30A in the region 20b, A step 50 is generated on the surface of the substrate 20. A step 50 is also formed on the surface of the second-layer web material 30B at the end of the first-layer web material 30A due to the step 50. [

Further, as shown in Fig. 1 (d), when the third layer web material 30C is wound on the second layer web material 30B, the web material 30 sinks further into the dough 20. Assuming that the thickness of the area 20a of the cushioning material 20 in which the overlapped portions of the first to third layer web materials 30A to 30C is 100 mu m, the compression strain of the area 20a is 80% . On the other hand, the thickness of the region 20b of the cushioning material 20 where the overlapping portions of the second and third layers of web material 30B and 30C are set is 200 mu m, and the compressive strain of the region 20b is 60% . Therefore, the web material 30 where the web materials 30A to 30C of the first to third layers overlap is subjected to a compressive stress (? 5 ) at a compressive strain of 80% from the buffer material 20. On the other hand, the web material 30 where the second and third layer web materials 30B and 30C overlap receives a compressive stress (? 4 ) at a compressive strain of 60% from the buffer material 20.

Therefore, as shown in Fig. 2, the compressive stress (? 5 ) (compressive strain of 80%) received by the web material 30 of the overlapping portions of the first to third web materials 30A to 30C, A larger difference is generated in the compressive stress? 4 (compression strain 60%) which the web material 30 of the portion where the third-layer web materials 30B and 30C overlap. Therefore, the web material 30 of the first to third web materials 30A to 30C overlaps the web material 30 of the overlapped web materials 30B and 30C of the second and third layers, It gets harder. As a result, as shown in Fig. 1 (d), at the end portion of the first-layer web material 30A, the surface of the first-layer web material 30A in the region 20a and the surface of the first- A larger step difference 50 is generated on the surface of the substrate 20. The web material 30 is wound with the step 50 being generated on the surfaces of the second and third layers of web material 30B and 30C at the end of the first layer web material 30A.

As described above, even when the soft buffer material 20 is formed on the outer circumferential surface of the core body as a countermeasure to the step difference caused by the end step of the conventional web material, the compressive stress and the compressive stress which are received by the overlapping portions of the first- And a large difference in the compressive stress received by the overlapped portion of the web material 30 of the second layer to the nth layer results in a difference in the compressive stress between the surface of the web material 30 of the second layer and the n- The web material 30 is wound while the step 50 is generated. As a result, a step trace due to a compressive stress difference similar to the step trace caused by the end step of the conventional web material 30 is generated in the web material 30. [

Here, the step trace due to such a compressive stress difference is of a degree that can be found by an expert skilled in the art by carefully observing it. For example, if a step trace due to such a compressive stress difference occurs in an optical film of a thin film, Not only deformation but also optical deformation, leading to deterioration in quality, is an especially important problem to be solved.

The inventors of the present invention have found from these findings that the compressive stress to which the overlapping portions of the first to n-th web materials 30 are subjected and the compressive stress to which the overlapped portions of the second to n-th web materials 30 are subjected The step 50 generated on the surface of the web material 30 of the second layer to the n-th layer at the end of the first-layer web material 30 is reduced, It is possible to reduce stepped traces, and the present invention has been accomplished.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. In addition, it is possible to appropriately change the scope of the present invention without departing from the scope of the present invention.

3 is a cross-sectional view schematically showing the configuration of core 1 according to one embodiment of the present invention. As shown in Fig. 3, in the core 1 of the present embodiment, the cushioning material 20 is formed on the outer peripheral surface of the cylindrical core body 10.

The cushioning material 20 of the present embodiment has a structure in which when the end portion of the web material 30 is attached on the cushioning material 20 and the web material 30 is wound on the core body while applying tension to the web material 30, It is preferable to be made of a soft material so as to sink into the buffer material 20. [ As the material of the cushioning material 20 having such characteristics, a soft foamed resin having a compressive stress of 0.02 MPa or less at a compression strain of 20% is suitable. At this time, the compressive stress is a value measured in accordance with JIS K6767. If the cushioning material 20 is constructed of a material having a compressive strain of 20% and a compressive stress of more than 0.02 MPa, the amount of sinking of the web material 30 into the cushioning material 20 is insufficient, It is impossible to sufficiently reduce the stepped traces.

The method of forming the cushioning material 20 on the outer circumferential surface of the core body 10 can be carried out by applying an adhesive or the like to the outer circumferential surface of the core body 10 or the surface of the cushioning material 20 . Alternatively, the cushioning material 20 may be attached to the outer peripheral surface of the core body 10 via the double-sided adhesive tape.

4 (a) to 4 (d) are enlarged cross-sectional views schematically showing a step of winding the web material 30 on the core 1 of the present embodiment. 4 (a) to 4 (d), only the cushioning member 20 formed on the outer peripheral surface of the core body 10 is omitted, and the core body 10 is omitted. The curvature of the surface of the buffer material 20 is omitted.

4 (a) shows a state in which the end portion of the web material 30 is attached to the surface of the cushioning material 20. Fig. Here, the case where the thickness of the cushioning material 20 is 500 mu m and the thickness of the web material 30 is 100 mu m will be described as an example, but the thickness of the cushioning material 20 and the thickness of the web material 30 30 are of course not limited to these sizes.

A method of attaching the end portion of the web material 30 to the surface of the cushioning material 20 can be achieved by adhering an adhesive tape to the surface of the cushioning material 20 and attaching the end portion of the web material 30 to the adhesive tape Or the like. Alternatively, as the buffer material 20, a material having a sticky surface may be used.

4 (b), when the web material 30 is wound around the cushioning material 20 while applying tensile force to the web material 30, the web material 30 is moved into the cushioning material 20 by the thickness Sit down. At this time, the thickness of the region 20a where the web material 30 of the buffer material 20 sinks is 400 mu m (compression strain is 20%). Then, the web material 30 receives a compressive stress (? 1 ) at a compressive strain of 20% from the buffer material 20.

The web material 30 sinks further into the cushioning material 20 when the second-layer web material 30B is further wound on the first-layer web material 30A as shown in Fig. 4 (c). Assuming that the thickness of the region 20a of the cushioning material 20 in which the overlapped portion of the first-layer web material 30A and the second-layer web material 30B is 200 mu m, the compression strain of the region 20a is 60%. On the other hand, the thickness of the region 20b of the cushioning material 20 in which the second-layer web material 30B sinks is 300 mu m, and the compression strain of the region 20b is 40%. Therefore, the web material 30 at the portion where the first-layer web material 30A and the second-layer web material 30B overlap is subjected to the compressive stress (? 3 ) at the compression strain of 60% from the buffer material 20 . On the other hand, the web material 30 of only the second-layer web material 30B receives the compressive stress (? 2 ) from the cushioning material 20 at a compression strain of 40%.

Further, as shown in Fig. 4 (d), when the third layer web material 30C is wound on the second layer web material 30B, the web material 30 sinks further into the cushioning material 20. Assuming that the thickness of the area 20a of the cushioning material 20 in which the overlapped portions of the first to third layer web materials 30A to 30C is 100 mu m, the compression strain of the area 20a is 80% . On the other hand, the thickness of the region 20b of the cushioning material 20 where the overlapping portions of the second and third layers of web material 30B and 30C are set is 200 mu m, and the compressive strain of the region 20b is 60% . Therefore, the web material 30 where the web materials 30A to 30C of the first to third layers overlap is subjected to a compressive stress (? 5 ) at a compressive strain of 80% from the buffer material 20. On the other hand, the web material 30 where the second and third layer web materials 30B and 30C overlap receives a compressive stress (? 4 ) at a compressive strain of 60% from the buffer material 20.

5 is a graph showing the compressive stress-strain curve of the cushioning material 20 of the present embodiment.

As shown in Fig. 5, the cushioning material 20 of the present embodiment has a characteristic that the inclination (change in compressive stress) of the compressive stress-strain curve is small in the range (A) where the compressive strain is 20% to 80% . 4 (c), the web material 30 at the portion where the first-layer web material 30A and the second-layer web material 30B overlap is subjected to the compressive stress ( σ 3) (the difference between the compressive strain of 60%) and, the second layer web material (30B), only the web material 30, the buffer material (compressive stress (σ 2) (compressive strain of 40%) receive from 20), it becomes very small . The surface of the first web material 30A in the region 20a and the surface of the cushioning material 20 in the region 20b at the end of the first web material 30A There is no step caused by the difference. As a result, a step trace due to the difference in compressive stress does not occur on the surface of the second-layer web material 30B at the end of the first-layer web material 30A.

Similarly, in the state illustrated in Fig. 4 (d), the web material 30 of the overlapping portion of the first to third layers of the web material 30A to 30B has the compressive stress? 5 And the compressive stress? 4 (compressive strain 60%) of the web material 30 of the web materials 30B and 30C of the second and third tiers only from the cushioning material 20 becomes very small . Therefore, a step due to a difference in compressive stress is not newly generated on the surfaces of the second and third layers of web material 30B and 30C at the end portion of the first-layer web material 30A.

However, when the thickness of the buffer material 20, the thickness of t 1, the web material 30 to t 2, the area of the first layer the buffer material 20 in the overlapped portion ~n web material 30 of the layer (20a) The difference between the compressive strain of the cushion material 20 and the compressive strain of the region 20b of the portion where the web material 30 of the second layer to the nth layer is overlapped is always t 2 / t 1 × 100 (%). For example, in the examples shown in Figs. 4 (a) to 4 (d), when the thickness t 1 of the cushioning material 20 is 500 탆 and the thickness t 2 of the web material 30 is 100 탆, The difference between the compressive strain of the region 20a of the buffer material 20 and the compressive strain of the region 20b is always 20%.

Therefore, as shown in Figure 6, the compressive stress in the compressive strain α% σ a a, and the compressive strain α% than the compression stress in the large compressive strain as t 2 / t 1 × 100 ( %) σ b The difference (? B - ? A ) between the compressive stresses which the web material 30 receives always during the process of winding the web material 30 on the core 1, when the difference between? A and? B is small, Can be kept small. Accordingly, the step trace due to the compressive stress difference can be reduced.

In the present invention, if the ratio (σ a / σ b ) of the compressive stress is 6 or less (σ a / σ b ≤ 6) during the process of winding the web material (30) on the core (1) The step difference can be effectively reduced. If? a /? b exceeds 6, the difference in compressive stress received by the web material 30 becomes large, and it becomes difficult to effectively reduce the step trace due to the compressive stress difference. If? a /? b ? 4, it is possible to more effectively reduce the step trace due to the compressive stress difference.

As described above, when the thickness of the cushioning material 20 is t 1 and the thickness of the web material 30 is t 2 , the difference in compression strain occurring in the regions 20a and 20b of the cushioning material 20 , and t 2 / t 1 × 100 (%). Therefore, if the thickness t 1 of the cushioning material 20 is sufficiently thick compared to the thickness t 2 of the web material 30, that is, if t 2 / t 1 × 100 (%) is small, The difference between the compressive stresses is small.

Therefore, the step trace due to the compressive stress difference, which is a problem to be solved by the present invention, is such that when the thickness t 1 of the cushioning material 20 is t 2 and the thickness of the wound web material 30 is t 2 / t 1 ≥0.1 And becomes remarkable when it is set. Here, if the thickness t 1 of the cushioning material 20 is too thin compared to the thickness t 2 of the web material 30, the compressive strain of the region 20a and the region 20b of the cushioning material 20 The difference becomes large, and as a result, it becomes difficult to find the buffer material 20 satisfying? A /? B ? 6. Therefore, the step difference mark reducing effect due to the compression stress difference according to the present invention is effectively exhibited when the thickness t 1 of the cushioning material 20 is set to 0.2? T 2 / t 1? 0.1.

As shown in Fig. 5, the cushioning material 20 of this embodiment undergoes elastic deformation in the range (A) where the compressive strain is 20% to 80%. The cushioning material 20 in contact with the end portion of the web material 30 is pulled by the sinking of the web material 30 and sinks in the same manner but the cushioning material 20 in the region slightly spaced from the end portion of the web material 30, Does not sink. As a result, as shown in Figs. 4 (b) to 4 (d), the grooves 40 remain on the surface of the cushioning material 20 in contact with the end portions of the web material 30 of the cushioning material 20. If the groove portion 40 remains, when the web material 30 is subjected to a large stress due to the winding, there is a fear that the web material 30 buckles so as to fill the gap of the groove portion 40.

However, as shown in Fig. 4 (e), the web material 30D of the fourth layer is wound on the third web material 30C to further sink the web material 30 into the buffer material 20, For this reason, the groove portion 40 can be eliminated.

4E, the thickness of the area 20a of the cushioning material 20 in which the overlapping portions of the first to fourth web materials 30A to 30D are set is 75 mu m, Lt; RTI ID = 0.0 > 85%. ≪ / RTI > On the other hand, the thickness of the region 20b of the cushioning material 20 in which the overlapping portions of the second to fourth layer web materials 30B to 30D are set is 175 mu m, and the compressive strain of the region 20b is 65% .

As shown in Fig. 5, the cushioning material 20 of this embodiment has a compression stress-strain curve and a yield point S that represents plastic strain at a compression strain of 85%. Let σ s be the compressive stress at this yield point.

Thus, in Fig. 4 (e), the area 20a of the cushioning material 20 in which the overlapping portions of the web materials 30A to 30D of the first to fourth layers sink is changed from elastic deformation to plastic deformation. As a result, the cushioning material 20 pulled due to the sinking of the web material 30A is not fixed to the end portion of the web material 30A, so that the remaining groove portion 40 is eliminated in the course of the elastic deformation . The buckling of the web material 30 caused by the groove portion 40 can be prevented.

The web material 30 in which the web materials 30A to 30D of the first to fourth layers are overlapped has a compressive stress? S at a compression strain of 85%, that is, a yield point S Lt; / RTI > The area 20a of the cushioning material 20 in which the overlapped portions of the first to fourth layers of the web material 30A to 30D are deposited occupies most of the entire circumference of the cushioning material 20, The ash 30 receives a very large compressive stress? S from almost the entire circumference of the cushioning material 20. Accordingly, even when a soft material is used as the cushioning material 20, the cushioning material 20 can be prevented from being deformed by tightening the web material 30, and as a result, buckling of the web material 30 can be prevented have.

In the present embodiment, the yield point of the cushioning material 20 is preferably generated at a compression strain of 90% or less. If the yield point exceeds the compressive strain of 90%, a sudden change in stress occurs, and local stress is applied to the web material 30, thereby damaging the web material 30, which is undesirable. The yield point compressive stress (σ s) of the (S) is preferably not less than, 10㎫. Yield point compressive stress in the (S) (σ s) is less than 10㎫, the web material 30 has been wound, it is difficult to tighten prevent deformation of the buffer material 20 according to the load. The yield point (S) compressive stress (σ s) at will, it is preferred that not more than 70㎫. Yield point (S) compressive stress (σ s) in a 70㎫ exceed, the compressive stress (σ s) is because it exceeds the yield strength of the web material (30) or close-up, the web material 30 is to be plastic deformation, It is not desirable because of concern.

As described above, in the method of winding the web material according to the present invention, the cushioning material 20 formed on the outer circumferential surface of the winding core body is subjected to compression (compression) in order to reduce the step trace caused by the end step of the conventional web material 30. [ A soft foamed resin having a compressive stress of 0.02 MPa or less at a strain of 20% is employed. The step trace due to the newly generated compressive stress difference when the web material 30 is wound around the winding core formed with the soft cushioning material 20 is determined by the thickness t 1 of the cushioning material 20 T 2 / t 1? 0.1) is set to 0.2? T 2 / t 1 ? In the range of the thickness of the cushioning material 20, as the cushioning material 20, the compressive stress at the compressive strain?% (20??? 60) is? A and the compressive strain when the compressive stress in the α + t 2 / t 1 × 100)% by σ b, the end of the compression stress ratio (σ b / σ a) is, at least six or less by using a material having characteristics, wound web material 30 It is possible to reduce the step trace due to the difference in compressive stress occurring on the surface of the web material 30. [

Further, when it is the thickness (t 1) of the cushioning material, the thickness take-up web material that (t 2), is set to 0.15≥t 2 / t 1 ≥0.1, as a characteristic of the buffer material, compressive strain α% (20≤α ≤65) and a compressive stress in a σ a, compressive strain (α + t 2 / t 1, when the compression stress at × 100)% by σ b, compression stress ratio (σ b / σ a) is, less than or equal to at least 4 The step trace due to the difference in compressive stress occurring on the surface of the web material 30 at the end portion of the wound web material 30 can be reduced.

The cushioning material 20 of the present embodiment has a yield point S indicating a plastic deformation at a compressive strain of 90% or less and a compressive stress at a yield point S of 10 MPa or more .

By using the cushioning material 20 having such characteristics, the step trace due to the difference in compressive stress can be further reduced, and the web material 30 is wound around the cushioning material 20 even by using a soft material The buckling of the web material 30 can be reduced.

The winding for winding the web material according to another embodiment of the present invention has a winding core body and a cushioning material 20 formed on the outer circumferential surface of the winding core body, and the cushioning material 20 has the following characteristics.

That is, the cushioning material 20 is made of a soft foamed resin having a compressive stress of 0.02 MPa or less at a compressive strain of 20%, and the thickness t 1 of the cushioning material 20 is t when a second, is set to 0.2≥t 2 / t 1 ≥0.1, the cushioning material 20 has a compressive stress-strain curve in, the compressive stress in the compressive strain α% (20≤α≤60) as a σ And σ b is the compressive stress at the compressive strain (α + t 2 / t 1 × 100)%, σ b / σ a ≤6.

Example

Hereinafter, the structure and effects of the present invention will be further described by way of examples of the present invention, but the present invention is not limited to these examples.

(Example 1)

A core body made of an ABS resin having an inner diameter of 3 inches (outer diameter of about 88 mm) was prepared, and a cushioning material made of a polyurethane foam (material A) having open cells was attached to the outer circumferential surface of the core body.

The cushioning material used in this example had a thickness of 750 mu m and a compressive stress at a compression strain of 20% of 0.020 MPa.

The bobbin body was attached to a winding device, and a biaxially oriented PET film (including an aluminum evaporated film) having a thickness of 75 m was wound at 320 m at a winding tension of 66 N and a winding speed of 150 m / min. Then, the wound PET film was allowed to stand at room temperature for 24 hours, and when the wound PET film was unwound, the step trace on the end of the PET film was visually confirmed.

(Comparative Example 1)

A core body made of an ABS resin having an inner diameter of 3 inches (outer diameter of about 88 mm) was prepared, and a cushioning material (material B) made of a polyethylene foam was attached to the outer peripheral surface of the core body.

The cushioning material used in Comparative Example 1 had a thickness of 750 mm and a compressive stress of 0.35 MPa at a compression strain of 20%.

The bobbin body was attached to a winding device, and a biaxially oriented PET film (including an aluminum evaporated film) having a thickness of 75 m was wound at 320 m at a winding tension of 66 N and a winding speed of 150 m / min. Then, the wound PET film was allowed to stand at room temperature for 24 hours, and when the wound PET film was unwound, the step trace on the end of the PET film was visually confirmed.

(Comparative Example 2)

A core body made of an ABS resin having an inner diameter of 3 inches (outer diameter of about 88 mm) was prepared, and a cushioning material (material C) made of a polyurethane foam was attached to the outer peripheral surface of the core body.

The cushioning material used in Comparative Example 2 had a thickness of 750 mm and a compressive stress of 0.012 MPa at a compression strain of 20%.

The bobbin body was attached to a winding device, and a biaxially oriented PET film (including an aluminum evaporated film) having a thickness of 75 m was wound at 320 m at a winding tension of 66 N and a winding speed of 150 m / min. Then, the wound PET film was allowed to stand at room temperature for 24 hours, and when the wound PET film was unwound, the step trace on the end of the PET film was visually confirmed.

Table 1 is a table showing results of evaluating the occurrence status of stepped marks in Example 1, Comparative Example 1, and Comparative Example 2.

Figure pct00001

As shown in Table 1, in Example 1, the step-like traces were confirmed up to about 1 m (four turns), but no more than the number of turns was confirmed. On the other hand, in Comparative Examples 1 and 2, the step marks were found to be 25 m (about 100 rims) and 10 m (about 40 rims), respectively.

In Example 1, Comparative Example 1 and Comparative Example 2, the ratio (t 2 / t 1 ) of the thickness t 1 of the cushioning material to the thickness t 2 of the PET film is 0.1. Thus, Table 1, compressive stress in the compressive strain α% (20≤α≤70) (σ a ) and a non-(σ b / σ a) of compressive strain (α + 10)% compressive stress (σ b) in the . For example, in Example 1 of Table 1, the compressive stress ratio (? B /? A ) of a compartment having a compressive strain? Of 20% is a compressive stress (? B = 0.024 MPa) (? B /? A = 1.2) of the compressive stress (? A = 0.020 MPa) at a strain of 20%.

As shown in Table 1, in Example 1, the upper limit value of the compressive stress ratio (? B /? A ) was 2.7 (? = 70%) in the range where the compressive strain? Therefore, the buffer material used in Example 1, the web material during the process which takes the (PET film) on the winding core volume, always, the web material in order to receive a compressive stress (σ b -σ a) a small state (σ b / σ ≤ a 2.7), which can be considered to reduce the step trace due to the compressive stress difference.

On the other hand, in Comparative Example 1, the compressive stress at the compression strain of 20% of the cushioning material is as large as 0.35 MPa, even though the upper limit value of the compressive stress ratio (? B /? A ) It is considered that when the web material is wound on the core body, the end portion of the web material sinks into the cushioning material, and as a result, a step trace attributable to the end step portion of the conventional web material has occurred.

In Comparative Example 2, the upper limit value of the compressive stress ratio (? B /? A ) is as large as 6.8 (? = 70), even though the compressive stress at the compressive strain 20% of the cushioning material is as small as 0.012 MPa. It can be considered that the occurrence of the stepped traces due to the car could not be sufficiently reduced.

(Example 2)

The same PET film (thickness 75 占 퐉) as above was wound in the same manner as in Example 1 except that the thickness of the cushioning material (material A) was changed to 550 占 퐉. The step trace at the end of the PET film was visually confirmed.

(Comparative Example 3)

Except that the thickness of the buffer material (material B) was changed to 550 占 퐉, the same PET film (thickness 75 占 퐉) as above was wound in the same manner as in Comparative Example 1, The step trace at the end of the PET film was visually confirmed.

(Comparative Example 4)

A PET film (thickness 75 占 퐉) similar to that described above was wound into a core in the same manner as in Comparative Example 2 except that the thickness of the cushioning material (material C) was changed to 550 占 퐉. The step trace at the end of the PET film was visually confirmed.

Table 2 is a table showing results of evaluating the occurrence status of stepped marks in Example 2, Comparative Example 3, and Comparative Example 4.

Figure pct00002

As shown in Table 2, in Example 2, the step trace was confirmed to be about 1 m (four turns), but the number of turns was not confirmed. On the other hand, in Comparative Example 3 and Comparative Example 4, the step trace was confirmed to be 30 m (about 120 rpm) and 20 m (about 80 rpm), respectively.

In Example 2, Comparative Example 3 and Comparative Example 4, the ratio (t 2 / t 1 ) of the thickness t 1 of the cushioning material to the thickness t 2 of the PET film is 0.15. Thus, in Table 2, the compressive strain α% (20≤α≤65) compressive stress (σ a) and a non-(σ b / σ a) of compressive strain (α + 15)% compressive stress (σ b) in at . For example, in Example 2 of Table 2, the compressive stress ratio ( b / aa ) of a compartment with a compressive strain? Of 20% is a compressive stress (? B = 0.028 MPa) at a compressive strain of 35% (? B /? A = 1.4) of the compressive stress (? A = 0.020 MPa) at a strain of 20%.

As shown in Table 2, in Example 2, the upper limit of the compressive stress ratio (? B /? A ) was 4.2 (? = 65%) in the range where the compressive strain? Therefore, the buffer material used in Example 2, the web material during the process which takes the (PET film) on the winding core volume, always, the web material in order to receive a compressive stress (σ b -σ a) a small state (σ b / σ ≤ a 4.2), and thus it can be considered that the step trace due to the compressive stress difference can be reduced.

On the other hand, in Comparative Example 3, the compression stress at the compressive strain of 20% of the cushioning material is as large as 0.35 MPa, even though the upper limit value of the compressive stress ratio (? B /? A ) It is considered that when the web material is wound on the core body, the end portion of the web material sinks into the cushioning material, and as a result, a step trace attributable to the end step portion of the conventional web material has occurred.

In Comparative Example 4, even though the compressive stress at 20% of the cushioning material is as small as 0.012 MPa, the upper limit of the compressive stress ratio (? B /? A ) is as large as 17.3 (? = 65% It can be considered that the occurrence of the step difference due to the stress difference can not be sufficiently reduced.

(Example 3)

The same PET film (thickness 75 占 퐉) as above was wound into a core by a method similar to that of Example 1 except that the thickness of the cushioning material (material A) was changed to 370 占 퐉. The step trace at the end of the PET film was visually confirmed.

(Comparative Example 5)

The same PET film (thickness 75 占 퐉) as above was wound into a core by a method similar to that of Comparative Example 1 except that the thickness of the cushioning material (material B) was changed to 370 占 퐉. The step trace at the end of the PET film was visually confirmed.

(Comparative Example 6)

A PET film (thickness 75 占 퐉) similar to that described above was wound into a core by a method similar to that of Comparative Example 2 except that the thickness of the cushioning material (material C) was changed to 370 占 퐉. The step trace at the end of the PET film was visually confirmed.

Table 3 is a table showing the results of evaluating the occurrence status of stepped marks in Example 3, Comparative Example 5, and Comparative Example 6.

Figure pct00003

As shown in Table 3, in Example 3, the step trace was confirmed up to about 2 m (8 wheels), but it was not confirmed by the number of wheels more than that. On the other hand, in Comparative Example 5 and Comparative Example 6, the step trace was confirmed to be 50 m (about 200 rpm) and 20 m (about 80 rpm), respectively.

In Example 3, Comparative Example 5 and Comparative Example 6, the ratio (t 2 / t 1 ) of the thickness t 1 of the cushioning material to the thickness t 2 of the PET film is 0.2. Accordingly, Table 3, the compressive stress in the compressive strain α% (20≤α≤60) (σ a ) , and compressive strain ratio (σ b / σ a) of (α + 20)% compressive stress (σ b) in the . For example, in Example 3 of Table 3, the compressive stress ratio (? B /? A ) of a compartment having a compressive strain? Of 20% is a compressive stress (? B = 0.034 MPa) at a compressive strain of 40% (? B /? A = 1.7) of the compressive stress (? A = 0.020 MPa) at a strain of 20%.

As shown in Table 3, in Example 3, the upper limit value of the compressive stress ratio (? B /? A ) was 6.1 (? = 60%) in the range where the compressive strain? Therefore, the buffer material used in Example 3, the web material during the process which takes the (PET film) on the winding core volume, always, the web material in order to receive a compressive stress (σ b -σ a) a small state (σ b / σ ≤ a 6.1), and thus it can be considered that the step trace due to the compressive stress difference can be reduced.

On the other hand, in Comparative Example 5, the compressive stress at the compression strain of 20% of the cushioning material is as large as 0.35 MPa, even though the upper limit value of the compressive stress ratio (? B /? A ) It is considered that when the web material is wound on the core body, the end portion of the web material sinks into the cushioning material, and as a result, a step trace attributable to the end step portion of the conventional web material has occurred.

In Comparative Example 6, the upper limit value of the compressive stress ratio (? B /? A ) was 31.7 (? = 60%), It can be considered that the occurrence of the step difference due to the stress difference can not be sufficiently reduced.

As a result, the cushioning material 20 formed on the outer circumferential surface of the core body uses a soft foamed resin having a compressive stress of 0.02 MPa or less at a compression strain of 20% in order to reduce a step trace attributable to the end step of a conventional web material Is needed.

In order to reduce the step trace due to the newly generated compressive stress difference when the web material is wound on the core having the soft cushioning material formed thereon, the thickness t 1 of the cushioning material is preferably set to be about the thickness t 2 of the wound web material , 0.2≥t when set to 2 / t 1 ≥0.1, as a characteristic of the buffer material, a compressive stress in the compressive strain α% (20≤α≤60) with σ a and compressive strain (α + t 2 / t 1 × when the compression stress at 100)% by σ b, the compression stress ratio (σ b / σ a), it can be seen that it is necessary for at least 6 or less.

In the above result, when the thickness t 1 of the cushioning material is set to 0.15? T 2 / t 1? 0.1 with respect to the thickness t 2 of the wound web material, the compressive strain? the compressive stress in% (20≤α≤65) with σ a and, when the compressive stress of the compressive strain in the (α + t 2 / t 1 × 100)% by σ b, compression stress ratio (σ b / σ a) Is set to at least 4 or less, it is possible to reduce the step trace due to the newly generated compressive stress difference when the web material is wound around the core having the buffer material.

In Examples 1 to 3, even if a soft material having a compressive stress of 20% or less and a compressive stress of 0.02 MPa or less is used as the buffer material, the web material is tightened to tighten the buckling of the web material caused by deformation of the buffer material. Was not observed. This is because the web material is wound around the cushioning material up to the compressive strain exceeding the yield point indicating the plastic deformation of the cushioning material and as a result the web material wound on the core receives a very large compressive stress from almost the entire circumference of the cushioning material I can think. The yield point of the cushioning material (material A) used in Examples 1 to 3 occurred at a compressive strain of 85%, and the compressive stress at this yield point was 15 MPa.

7 shows a state in which the surface of the cushioning material 20 used in Examples 1 to 3 is pressed by a coin and the cushioning material 20 is relaxed to a compression strain of 85% . As shown in Fig. 7, it can be seen that a concave portion in the form of a coin due to plastic deformation of the cushioning material 20 is left on the surface of the cushioning material 20.

While the present invention has been described with reference to the preferred embodiments thereof, it is to be understood that such description is not intended to be construed in a limiting sense.

For example, in the above embodiment, the compressive strain of the cushioning material 20 in the winding process of the web material 30 and the compressive strain of the web material 30 in the cushioning material 20 However, the number of windings of the web material shown here is merely an example for explanation, and the relationship between the number of windings of the web material, the compressive strain and the compressive stress is not limited.

In the above embodiment, the PET film has been described as an example of the web material 30, but the present invention is not limited thereto. The present invention can be applied to other polyester films and polyethylene films, of course.

1: core 10: core core
20: cushioning material 30: web material
40: groove portion 50:

Claims (5)

A winding method for winding a web material on a core,
The winding core has a buffering member formed on the outer circumferential surface of the winding core body,
Attaching an end of the web material to the buffer material;
A step of winding the web material on the core body while applying tensile force to the web material
/ RTI >
The cushioning material is made of a soft foamed resin having a compression stress at a compression strain of 20% of 0.02 MPa or less,
The thickness t 1 of the cushioning material is set to 0.2? T 2 / t 1? 0.1 when the thickness of the web material to be wound is t 2 ,
The cushioning material has a compressive strain (α + t 2 / t 1 × 100)%, a compressive stress at a compressive strain α% (20 ≦ α ≦ 60) and a compressive strain at a compressive stress- Of the web material is? B /? A ? 6, where? B is the compressive stress in the web material. The method according to claim 1,
Wherein the thickness t 1 of the cushioning material is set to 0.15? T 2 / t 1? 0.1 when the thickness of the web material to be wound is t 2 ,
The cushioning material has a compressive stress-strain curve in which a compressive stress at a compressive strain?% (20??? 65) is? A and a compressive stress at a compressive strain (? + T 2 / t 1 100) b & lt ; / = a & lt ; / = 4. The method according to claim 1 or 2,
Wherein in the step of winding the web material on the core body, the web material is wound on the core material body by squeezing the cushioning material up to a compressive strain exceeding a yield point indicating plastic deformation of the cushioning material. In the winding of the web material,
A core body,
And a cushioning member
Lt; / RTI &
The cushioning material is made of a soft foamed resin having a compression stress at a compression strain of 20% of 0.02 MPa or less,
The thickness t 1 of the cushioning material is set to 0.2? T 2 / t 1? 0.1 when the thickness of the web material to be wound is t 2 ,
The cushioning material has a compressive stress-strain curve in which a compressive stress at a compressive strain?% (20?? 60) is? A and a compressive stress at a compressive strain (? + T 2 / t 1 100) b & lt ; / RTI > The method of claim 4,
Wherein the thickness t 1 of the cushioning material is set to 0.15? T 2 / t 1? 0.1 when the thickness of the web material to be wound is t 2 ,
The cushioning material has a compressive stress-strain curve in which a compressive stress at a compressive strain?% (20??? 65) is? A and a compressive stress at a compressive strain (? + T 2 / t 1 100) b , and σ b / σ a ≤4.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170139558A (en) * 2015-07-07 2017-12-19 가부시키가이샤 미카타 Winding and winding method of web material

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
TWI669544B (en) * 2018-02-14 2019-08-21 住華科技股份有限公司 Winding structure and a method for forming the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04260575A (en) * 1991-02-14 1992-09-16 Teijin Chem Ltd Tubular body for winding plastic film
JPH09142739A (en) * 1995-11-21 1997-06-03 Mitsui Toatsu Chem Inc Spool core for metal plastic laminating material and method of application thereof
JP2005162478A (en) 2003-11-14 2005-06-23 Nagaoka Sangyo Kk Core
JP3174515U (en) * 2012-01-12 2012-03-22 日東電工株式会社 Rolls of belt-like patch
JP2013199344A (en) * 2012-03-26 2013-10-03 Nagaoka Sangyo Kk Winding core

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3174515B2 (en) 1996-12-03 2001-06-11 株式会社クボタ Gearshift operating device for work vehicles
JP2003146495A (en) * 2001-11-15 2003-05-21 Kanegafuchi Chem Ind Co Ltd Winding core for film and winding method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04260575A (en) * 1991-02-14 1992-09-16 Teijin Chem Ltd Tubular body for winding plastic film
JPH09142739A (en) * 1995-11-21 1997-06-03 Mitsui Toatsu Chem Inc Spool core for metal plastic laminating material and method of application thereof
JP2005162478A (en) 2003-11-14 2005-06-23 Nagaoka Sangyo Kk Core
JP3174515U (en) * 2012-01-12 2012-03-22 日東電工株式会社 Rolls of belt-like patch
JP2013199344A (en) * 2012-03-26 2013-10-03 Nagaoka Sangyo Kk Winding core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170139558A (en) * 2015-07-07 2017-12-19 가부시키가이샤 미카타 Winding and winding method of web material

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