Binding tape, and manufacturing method therefor

Abstract

To propose a binding tape exhibiting high wear resistance (suppression of fuzz) during use.SOLUTION: There is provided a binding tape formed by vertically laminating an upper side synthetic resin film and a lower side synthetic resin film as two long-length synthetic resin films each that are very thin belt-shaped. Respective end-edges in lateral directions of the two synthetic resin films are superposed on the upper side synthetic resin film, to one side side-edge of the binding tape and the other side side-edge of the binding tape, respectively; and a first folding / overlapping part extending in a longitudinal direction is formed. The lower side synthetic resin film and the upper side synthetic resin film at the first folding / overlapping part are welded with each other, and one side weld part extending in a longitudinal direction on a side of one side side-edge of the binding tape, and the other side weld part extending in a longitudinal direction on a side of the other side side-edge of the binding tape are formed, respectively. There is provided the binding tape welded only at each of the one side weld part and the other side weld part between the lower side synthetic resin film and the upper side synthetic resin film that are laminated vertically.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a thin, flat, long, synthetic resin binding tape used for binding various objects and members, having a predetermined width in a lateral direction perpendicular to the longitudinal direction of the long length, and to a method for manufacturing the same. [Background technology]

[0002] Synthetic resin binding tape is supplied to the market in lengths of, for example, 5,750 m wrapped around a tubular body such as a cardboard tube (for example, a total weight including the paper tube of about 4 kg) and is used to bind a variety of items and components, such as cardboard boxes, printed materials before binding in the bookbinding process, sheets and towels (linen supplies) in hotels and hospitals, and various items and components in the agricultural sector.

[0003] When used to bundle cardboard boxes, for example, 10 to 20 sheets of cardboard are bundled together and tied (bound) using an automatic bundling machine in order to make the cardboard boxes easier to hold.

[0004] Polypropylene bands (PP bands) are often used overseas to tie the various items mentioned above, especially when bundling and tying cardboard boxes. In Japan, binding tape has traditionally been used more often. This is thought to be because PP bands can dig into the corners of bundled cardboard boxes and cause damage to some of the cardboard. It is also thought to be a reflection of the ancient Japanese culture of tying.

[0005] If the tape bites into the object being bound, such as cardboard boxes, no matter whether PP bands or binding tape are used, there is a possibility that a problem will occur when trying to remove the bitten part on the customer's automatic unpacking line, causing the line to malfunction. For this reason, no matter what binding material is used, such as binding tape or PP bands, it is desirable that the material be laid flat on the object being bound, such as cardboard boxes, and not bite into it.

[0006] Recently, in Southeast Asia and other overseas countries, there has been a gradual trend towards introducing equipment that uses binding tape instead of PP bands.

[0007] Various proposals have been made regarding such bundling tapes. For example, Patent Document 1 proposes a bundling tape that is said to have excellent workability and abrasion resistance.

[0008] Traditionally, bundling tapes are available in standard types such as #28, #35, and #50. These types indicate the width of the tape. #50 means that the width in the horizontal direction perpendicular to the longitudinal direction of the long length is 50 mm.

[0009] In the case of the narrower #28 and #35 types, it is common to wrap the band around the object to be bound, such as cardboard, twice before binding, while the wider #50 bands in one go, shortening the binding time and is used in high-speed processing lines in the cardboard industry, etc. There is also the #75, but it is rarely used due to its low cost and there is little demand for it. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2016-145362 A [Patent Document 2] Design Registration No. 1693393 Summary of the Invention [Problem to be solved by the invention]

[0011] Currently, the binding tapes on the market are stretched tapes in which both side edges in the horizontal direction are slit by the slitting blade (cutter) of a slitter. Therefore, when a roll of binding tape is placed inside a binding machine, on a floor, a table, etc., the side edges are rubbed against each other, causing fuzz to be generated from the side edges of the binding tape roll, which causes problems with machine binding.

[0012] For this reason, from the standpoint of improving abrasion resistance (preventing fuzzing), the binding tape is generally commercialized with both lateral edge ends deeply folded in.

[0013] Typical product widths of binding tapes conventionally offered on the market, i.e., the product width after folding and the tape width in an unfolded state before folding, are, for example, as follows: Designation #28 #35 #50 Tape width (mm) 28 35 50 After folding (mm) 16 21 30

[0014] In the case of the conventional commercially available products mentioned above, the bundling tapes sold on the market are all folded with approximately 40% of the tape width folded over, whether it is #28, #35 or #50.

[0015] Conventionally, the binding tape generally available on the market is preferred to be wider in width because it is desired that the tape will lie flat on the object to be bound, such as cardboard, without digging into it.

[0016] However, as mentioned above, when about 40% of the tape width is folded into the binding tape provided on the market, the tape width after folding cannot be made wider. On the other hand, if the folds are narrowed in order to widen the tape width after folding, it becomes difficult to fold the tape stably and uniformly. Even if the tape is folded once, the folds may open up during use by the machine, so the current situation is that the tape is woven deeply and widely.

[0017] In this situation, the applicant of the present application has provided the market with a bundling tape that has improved abrasion resistance (prevents pilling) without folding by forming longitudinally extending welded portions on both lateral side edges of the bundling tape that have been slit by the slitting blade (cutter) of a slitter (Patent Document 2).

[0018] The binding tape of Patent Document 2 is made by stacking two thin, long sheets (films) made of synthetic resin and forming longitudinally extending welded portions on each of the two horizontal side edges of the binding tape, one side edge and the other side edge, and then stretching the tape.Then, it is embossed from the front side to the back side to form an embossed pattern of projections and recesses on both the front and back sides.

[0019] This has enabled the wear resistance to be improved, but there is still room for improvement in terms of wear resistance.

[0020] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a binding tape having improved abrasion resistance and a method for manufacturing the same. [Means for solving the problem]

[0021] (Invention of manufacturing method) The manufacturing method of the present invention can be exemplified as follows.

[0022] This is a method for manufacturing a thin binding tape made of synthetic resin that is long in the longitudinal direction and has a predetermined width in the transverse direction perpendicular to the longitudinal direction, and includes a welding portion forming process, a slitting process, a folding process, a crimping process, and a stretching process, which are described below.

[0023] (Welded part formation process) This process involves passing a raw film, which is composed of two extremely thin synthetic resin films, an upper synthetic resin film and a lower synthetic resin film, stacked one on top of the other and which have a width in the horizontal direction that is more than multiple times the width of the binding tape to be manufactured, through a plurality of heated rotating rolls arranged at a predetermined interval between each other in the horizontal direction, in the flow direction extending in the longitudinal direction, to form a plurality of one-side welded portions and other-side welded portions extending in the longitudinal direction, with a predetermined interval between each other in the horizontal direction, where the upper synthetic resin film and the lower synthetic resin film are welded, at positions where the two side edges of each of the binding tapes to be manufactured, that is, one side edge of the binding tape and the other side edge of the binding tape, are formed.

[0024] (Slitting process) This is a process in which the upper synthetic resin film and the lower synthetic resin film between the one side welded portion and the other side welded portion, which are adjacent in the horizontal direction, are cut by a slitter blade of a slitter at a position between the one side welded portion and the other side welded portion, to form a free edge of the upper synthetic resin film and a free edge of the lower synthetic resin film on the outer side in the horizontal direction of the one side welded portion and the outer side in the horizontal direction of the other side welded portion, respectively.

[0025] (Folding process) a step of folding back the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film to the upper side of the one-side welded portion and the upper side of the other-side welded portion by a folding back means located downstream of the slitter blade in the flow direction, thereby overlapping the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film on the upper synthetic resin film to form a first folded back portion extending in the longitudinal direction, or a step of folding back the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film to the lower side of the one-side welded portion and the lower side of the other-side welded portion by a folding back means located downstream of the slitter blade in the flow direction, thereby overlapping the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film under the lower synthetic resin film to form a second folded back portion extending in the longitudinal direction.

[0026] (Crimping process) a step of pressing the edge of the upper synthetic resin film and the edge of the lower synthetic resin film, which are folded back above the one-side welded portion and above the other-side welded portion, against the one-side welded portion and the other-side welded portion, by a first pressing roll of a first stretching roll stand located downstream of the folding back means in the flow direction, or a step of pressing the edge of the upper synthetic resin film and the edge of the lower synthetic resin film, which are folded back below the one-side welded portion and below the other-side welded portion, against the one-side welded portion and the other-side welded portion, by a first pressing roll of a first stretching roll stand located downstream of the folding back means in the flow direction.

[0027] (Stretching process) After the pressing step, the sheet is passed through a heating means located downstream of the first stretching roll stand in the flow direction and a second pressing roll of a second stretching roll stand located downstream of the heating means, and stretched by the speed difference between the rotation speed of the first pressing roll and the rotation speed of the second pressing roll, thereby forming the first folded portion into a first folded portion extending in the longitudinal direction, or forming the second folded portion into a second folded portion extending in the longitudinal direction.

[0028] The manufacturing method of the present invention includes the above-mentioned welding portion forming step, slitting step, folding step, crimping step, and stretching step, The region defined between the one-side welded portion and the other-side welded portion formed in the welded portion forming step is a raw material film portion for manufacturing a unit binding tape, which is long in the longitudinal direction and has a width in the transverse direction corresponding to the width of the binding tape to be manufactured, Between the one-side welded portion of one of the raw film portions for manufacturing a unit bundling tape that are adjacent in the transverse direction among the prepared raw film portions for manufacturing a unit bundling tape, and the other-side welded portion of the raw film portion for manufacturing another unit bundling tape, a raw film portion for forming a folded portion used to form the first folded portion or the second folded portion is provided. This is what happens.

[0029] In the above-mentioned method for manufacturing a binding tape, after the stretching step, an embossing step for applying an embossing process to the surface to form irregularities can be carried out downstream in the flow direction, consecutive to the stretching step.

[0030] (Invention of binding tape) The binding tape of the present invention produced by the above-mentioned production method will be illustrated below with reference to FIG. [1] The bundling tape 1 is formed by stacking two extremely thin, strip-shaped, long synthetic resin films, an upper synthetic resin film 2 and a lower synthetic resin film 3, one above the other. The binding tape 1 extends in the longitudinal direction, and has two side edges in a lateral direction perpendicular to the longitudinal direction, i.e., a binding tape one side edge 4 and a binding tape other side edge 5. The respective lateral edges 2a, 3a, 2c, 3c of the two synthetic resin films are overlapped on the upper synthetic resin film 2 to form first folded portions 6c, 6d extending in the longitudinal direction, or the respective end edges 2a, 3a, 2c, 3c of the two synthetic resin films in the lateral direction are overlapped under the lower synthetic resin film 3, and second folded-over portions 7c, 7d extending in the longitudinal direction are formed; The upper synthetic resin film 2 and the lower synthetic resin film 3 in the first folded-over portions 6c, 6d and the second folded-over portions 7c, 7d are welded to each other, so that a one-side welded portion 8 extending in the longitudinal direction is formed on the side of one side edge 4 of the binding tape, and an other-side welded portion 9 extending in the longitudinal direction is formed on the side of the other side edge 5 of the binding tape, The binding tape 1 has an upper synthetic resin film 2 and a lower synthetic resin film 3 laminated one on the other, which are welded only at a welded portion 8 on one side and a welded portion 9 on the other side.

[0031] [2] In the binding tape 1 of [1] above, The first folded portion side edge 6e, which is the edge on the side of the one side edge 4 of the binding tape in the first folded portion 6c, 6d and extends in the longitudinal direction, and the first folded portion side edge 6f, which is the edge on the side of the other side edge 5 of the binding tape and extends in the longitudinal direction, form the binding tape one side edge 4a at the binding tape one side edge 4 of the binding tape 1 and the binding tape other side edge 5a at the binding tape other side edge 5 of the binding tape 1.

[0032] Alternatively, as described above, when the second folded portions 7c, 7d are formed, the second folded portion edge 7e, which is the edge on the side of the one side edge 4 of the binding tape in the second folded portions 7c, 7d and extends in the longitudinal direction, and the second folded portion edge 7f, which is the edge on the side of the other side edge 5 of the binding tape and extends in the longitudinal direction, form the binding tape one side edge 4a at the binding tape one side edge 4 of the binding tape 1 and the binding tape other side edge 5a at the binding tape other side edge 5 of the binding tape 1.

[0033] [3] In the binding tape of [1] or [2] above, The edges 2a, 3a of the two synthetic resin films that extend in the longitudinal direction and form the first folded-over portion 6c from the edge 8a of the one-side welded portion 8 on the side of the one-side edge 4 of the binding tape in the lateral direction are folded back onto the upper synthetic resin film 2, The edges 2c, 3c of the two synthetic resin films extending in the longitudinal direction and positioned on the side of the other side edge 5 of the binding tape of the other side welded portion 9 and forming the first folded portion 6d from the other side welded portion side edge 9a are folded back onto the upper synthetic resin film 2.

[0034] Alternatively, as described above, when the second folds 7c and 7d are formed, The edges 2a, 3a of the two synthetic resin films that extend in the longitudinal direction and form the second folded-over portion 7c from the edge 8a of the one-side welded portion 8 on the side of the one-side edge 4 of the binding tape in the lateral direction are folded back under the lower synthetic resin film 3, The edges 2c, 3c of the two synthetic resin films extending in the longitudinal direction and positioned on the side of the other side edge 5 of the binding tape of the other side welded portion 9 and forming the second folded portion 7d from the other side welded portion side edge 9a are folded back under the lower synthetic resin film 3.

[0035] [4] In any of the above [1], [2], or [3] binding tapes, The area of ​​the binding tape 1 where the first folds 6c, 6d are formed is embossed with a concave-convex surface, or, as described above, when the second folds 7c, 7d are formed, the area of ​​the binding tape 1 where the second folds 7c, 7d are formed is embossed with a concave-convex surface.

[0036] [5] In any of the above [1], [2], [3], and [4] binding tapes, The upper synthetic resin film 2 and the lower synthetic resin film 3 each have a thickness of 7μ to 11μ.

[0037] [6] In any of the above [1], [2], [3], [4], and [5] binding tapes, The width (W) of the binding tape 1, which is the horizontal length of the binding tape 1, is 35 mm to 40 mm, the width (D) of the one side welded portion 8 and the other side welded portion 9 is 1 mm to 3 mm, and the width (S) of the first folded portion 6c, 6d and the second folded portion 7c, 7d is 1 mm to 3 mm. Effect of the Invention

[0038] According to the present invention, it is possible to provide a binding tape having improved abrasion resistance and a method for manufacturing the same.

[0039] Furthermore, it is possible to provide a binding tape that can exhibit physical properties equivalent to those of conventional binding tapes, while reducing the weight (amount used) per unit used by, for example, 20%, has excellent binding properties and prevents the tape from digging into products, and is expected to reduce CO2 emissions by 20% even when discarded after use, making it possible to provide a binding tape that can contribute to protecting the global environment and reducing carbon dioxide emissions. [Brief description of the drawings]

[0040] [Figure 1] 1 is a schematic diagram illustrating a manufacturing process of a binding tape according to one embodiment of the present invention. [Diagram 2] (a) A cross-sectional view, with some parts omitted, illustrating the manufacturing process at the portion indicated by the symbol A in Figure 1; (b) A cross-sectional view, with some parts omitted, illustrating the manufacturing process at the portion indicated by the symbol B in Figure 1; (c) A cross-sectional view, with some parts omitted, illustrating the manufacturing process at the portion indicated by the symbol C in Figure 1; (d) A cross-sectional view, with some parts omitted, illustrating the manufacturing process at the portion indicated by the symbol D in Figure 1; (e) A cross-sectional view, with some parts omitted, illustrating the manufacturing process at the portion indicated by the symbol E in Figure 1; (f) An enlarged cross-sectional view, with some parts omitted, illustrating an example of the structure between the one-side welded portion and the multi-side welded portion formed adjacent to each other in Figure 2(b). [Diagram 3] FIG. 3 is a partially omitted plan view for explaining an overview of the steps between FIG. 2(a) and FIG. 2(d). [Figure 4] 2(a) is a partially enlarged cross-sectional view with some parts omitted to explain the manufacturing process in the state shown in FIG. 2(d), and FIG. 2(b) is a partially enlarged cross-sectional view with some parts omitted to explain another manufacturing process in the state shown in FIG. 2(d). [Diagram 5] (a) A diagram explaining the positions of the width (W), the width (D) of the one-side welded portion and the other-side welded portion, and the width (S) of the first folded portion and the second folded portion in the binding tape of the present invention in the state shown in Figure 2(e); (b) A diagram explaining the positions of the width (W), the width (D) of the one-side welded portion and the other-side welded portion, and the width (S) of the first folded portion and the second folded portion in the binding tape of the present invention in another state shown in Figure 2(e). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. <Example of a method for manufacturing a bundling tape> The binding tape manufacturing method of this embodiment is a method for producing a thin, synthetic resin binding tape that is long in the longitudinal direction and has a predetermined width in the transverse direction perpendicular to the longitudinal direction, i.e., a thin, flat, string-like synthetic resin binding tape that is long and has a predetermined width in the transverse direction perpendicular to the longitudinal direction, and that can be used to bind various items and components.

[0042] (Preparation of raw film) Raw materials known in the technical field for manufacturing thin synthetic resin binding tapes are fed into a hopper 50 (FIG. 1). In this embodiment, high density polyethylene resin (HDPE) is used as the main raw material. For high density polyethylene resin (HDPE), a raw material with MI=0.8 to 1.0 as an oriented grade can be used.

[0043] The raw materials mixed in the hopper 50 are extruded by the next extruder 51 in the flow direction to an inflation extrusion molding machine 52, and from the inflation extrusion molding machine 52, two extremely thin synthetic resin films, which will become the upper synthetic resin film 20 and the lower synthetic resin film 30, are taken up by a take-up roll machine 54 via a cooling air ring 53 (Figure 1).

[0044] The extruder 51 may be, for example, one that incorporates an HDPE screw with a screw diameter of 65 mm and L / D 30, and extrudes to the subsequent inflation extruder 52 at a melt temperature setting of 170°C to 200°C.

[0045] The inflation extrusion molding machine 52 is equipped with a die having a diameter of, for example, 300 mm, and the binding tape 1 to be produced (Figures 5(a) and (b)) has a width in the horizontal direction that is more than several times the width indicated by W in Figures 5(a) and (b), for example a width of 720 mm, and the two extremely thin synthetic resin films that are long in the longitudinal direction, that is, an upper synthetic resin film 20 and a lower synthetic resin film 30, are taken up by a take-up roll machine 54 via a cooling air ring 53 (Figure 1).

[0046] By passing through the take-up roll machine 54 in the flow direction (the direction shown by arrows 100, 101), the raw film 40, which is made up of the upper synthetic resin film 20 and the lower synthetic resin film 30 laminated one above the other, is drawn out to the next roller (FIGS. 1 and 2(a)). The raw film 40 has a thickness of about 20μ to 28μ, as the upper synthetic resin film 20, which has a thickness of about 10μ to 14μ, and the lower synthetic resin film 30, which has a thickness of about 10μ to 14μ, are laminated one above the other.

[0047] (Welded part formation process) The raw film 40, which is composed of two extremely thin synthetic resin films, an upper synthetic resin film 20 and a lower synthetic resin film 30, laminated one on top of the other and having a width in the horizontal direction that is more than multiple times the width indicated by W in Figures 5(a) and (b) of the binding tape 1 to be manufactured and which is long in the longitudinal direction, is passed through a plurality of heated rotating rolls 55, 55, 55, 55 (Figures 1 and 3) which are arranged at a predetermined interval between each other in the horizontal direction in the flow direction extending in the longitudinal direction.

[0048] In addition, in Figure 2(a), which is a cross-sectional view with some parts omitted to explain the manufacturing process of the part indicated by symbol A in Figure 1, raw material film 40 is shown as being composed of an upper synthetic resin film 20 and a lower synthetic resin film 30, which are two extremely thin synthetic resin films that are long in the longitudinal direction, stacked one on top of the other. However, in Figures 2(b) to 2(d), which show the raw material film 40 after it has passed through heated rotating rolls 55, 55, 55, 55 (Figures 1 and 3), the upper synthetic resin film indicated by symbol 20 in Figure 2(a) is represented by symbol 2, and the lower synthetic resin film indicated by symbol 30 in Figure 2(a) is represented by symbol 3, in correspondence with the finally manufactured binding tape 1 (Figure 5(a)) (i.e., the binding tape 1 composed of an upper synthetic resin film 2 and a lower synthetic resin film 3, which are two extremely thin, strip-like, long synthetic resin films, stacked one on top of the other).

[0049] As described above, as the raw film 40 passes through the heated rotating rolls 55, 55, 55, 55 (Figures 1 and 3), at the positions where the two side edges of each of the binding tapes 1 to be produced, that is, one side edge 4 of the binding tape and the other side edge 5 of the binding tape (Figure 5(a)), are formed, multiple one side welded portions 8 and other side welded portions 9 extending in the longitudinal direction (left and right direction in Figure 3) are formed by welding the upper synthetic resin film 2 and the lower synthetic resin film 3, with a predetermined distance between them in the horizontal direction (up and down direction in Figure 3) (Figure 2(b)).

[0050] For example, when eight pieces of binding tape 1 (Figures 5(a) and (b)) are produced from the above-mentioned raw material film 40, one side welded portion 8 is formed at the position that will become one side edge 4 of the binding tape and the other side edge 5 of the binding tape (Figure 5(a)) at the two side edges of each of the eight pieces of binding tape, and the other side welded portion 9 is formed at the position that will become the other side edge 5 of the binding tape.

[0051] In Fig. 3, for the production of three (pieces) of binding tapes at the center in the vertical direction, one-side welded portion 8 and other-side welded portion 9 are formed at the positions of one side edge 4 (Fig. 5(a)) and other side edge 5 (Fig. 5(a)) of each binding tape, respectively. Note that in Fig. 3, similar welded portions are formed on the upper and lower sides of the three (pieces) at the center, but are not shown in Fig. 3.

[0052] Each of the heating rotary rolls 55, 55, 55, 55 is formed as a pair of heating rotary rolls 55a, 55b, and a welded portion 8 on one side is formed at the position of the heating rotary roll 55a, and a welded portion 9 on the other side is formed at the position of the heating rotary roll 55b.

[0053] The area partitioned between one side welded portion 8 and the other side welded portion 9 formed in the weld formation process becomes raw film portions 42a, 42b, 42c, 42d, 42e, ... for manufacturing unit binding tapes (Figure 3), which are long in the longitudinal direction (left and right direction in Figure 3) and have a width in the horizontal direction (top and bottom direction in Figure 3) corresponding to the width of the binding tape 1 to be manufactured (Figures 5(a) and (b)).

[0054] Among the multiple unit binding tape manufacturing raw film portions 42a, 42b, 42c, 42d, 42e, ... prepared in the welded portion forming process, the portion between one side welded portion 8 of one unit binding tape manufacturing raw film portion 42a and the other side welded portion 9 of another unit binding tape manufacturing raw film portion 42b adjacent in the horizontal direction (up and down direction in Figure 3) becomes the folded portion forming raw film portions 41a, 41b, 41c, 41d, ... which are used to form the first folded portions 6c, 6d described below (Figure 3).

[0055] In the embodiment shown in Figure 3, the upper side of the uppermost one-side welded portion 8 becomes the raw material film portion 42a for manufacturing the unit binding tape, which is long in the longitudinal direction and has a width in the transverse direction corresponding to the width of the binding tape 1 (Figure 5) to be manufactured.

[0056] In addition, the area between the topmost one-side welded portion 8 and the other-side welded portion 9 of the raw material film portion 42b for manufacturing another unit binding tape, which is formed below the topmost one-side welded portion 8, constitutes the raw material film portion 41a for forming the fold-back portion, which is used to form the first fold-back portions 6c and 6d described below.

[0057] 2(b) is a cross-sectional view with some parts omitted to explain the manufacturing process of the portion indicated by the symbol B in FIG. 1, and FIG. 2(f) is an enlarged cross-sectional view with some parts omitted to explain one example of the structure between one-side welded portion 8 and multiple-side welded portion 9 formed adjacent to each other in FIG. 2(b). As will be described later, the middle portion of folded-back portion-forming raw film portion 41b used to form first folded-back portions 6c, 6d is cut by slitter blade 56 of a slitter, and free edges 2a, 2c of upper synthetic resin film 2 and free edges 3a, 3b of lower synthetic resin film 3 are respectively cut on the outer side in the lateral direction of one-side welded portion 8 (left side in FIG. 2(c)) and the outer side in the lateral direction of other-side welded portion 9 (right side in FIG. 2(c)). 3c is formed, and these free edges 2a, 2c and free edges 3a, 3c are folded at the boundary between one side welded portion 8 and the boundary between the other side welded portion 9, respectively, to form first folded-back portions 6a, 6b (Figs. 2(d) and 4(a)) and second folded-back portions 7a, 7b (Fig. 4(b)), and further to form first folded-over portions 6c and 6d (Figs. 2(e) and 5(a)) and second folded-over portions 7a, 7b (Fig. 5(b)).

[0058] As described later, the width (S) of the first folded-over portions 6c, 6d and the second folded-over portions 7c, 7d is set in the range of 1 mm to 3 mm, and therefore the length (size) in the horizontal direction (left-right direction in the drawing) of the raw film portion 41b for forming the folded-over portion shown in Figure 2(f) is set in the range of 2 mm to 6 mm.

[0059] As described later, the width (D) of one side welded portion 8 and the other side welded portion 9 is set in the range of 1 mm to 3 mm, and therefore the length (size) in the horizontal direction (left-right direction of the drawing) of one side welded portion 8 and the other side welded portion 9 shown in Figure 2(f) is set in the range of 2 mm to 6 mm.

[0060] (Slitting process) When the above-mentioned welded portion forming process is carried out, as shown in Figures 2(b) and 3, raw material film portions 42a, 42b, 42c, 42d, and 42e for manufacturing unit binding tapes are formed, which are areas partitioned by one side welded portion 8 and the other side welded portion 9, and raw material film portions 41a, 41b, ... for forming folded portions are formed, which are areas partitioned by one side welded portion 8 and the other side welded portion 9 that are adjacent in the horizontal direction, as shown by symbols 41a, 41b, 41c, and 41d in Figures 2(b) and 3, to finally produce the binding tape 1 (Figures 5(a) and (b)).

[0061] In the raw film portions 42a, 42b, 42c for manufacturing unit binding tapes, which are the areas partitioned by one side welded portion 8 and the other side welded portion 9 to ultimately produce the binding tape 1 (Figure 5(a)), the upper synthetic resin film 2 and the lower synthetic resin film 3, which are layered one on top of the other, are not welded together as shown in Figure 2(b), and the state in Figure 1 in which the upper synthetic resin film 20 and the lower synthetic resin film 30 are layered one on top of the other to form the raw film 40 (Figure 2(a)) is maintained.

[0062] In addition, between the upper synthetic resin film 2 and the lower synthetic resin film 3 in the raw film portions 41a, 41b for forming the folded portion, which is the area between the one side welded portion 8 and the other side welded portion 9 adjacent in the horizontal direction, the state in which the upper synthetic resin film 20 and the lower synthetic resin film 30 are stacked vertically to form the raw film 40 in Figure 1 (Figure 2(a)) is maintained, as shown in Figure 2(b).

[0063] In the slitting process, the upper synthetic resin film 2 and the lower synthetic resin film 3 in the raw film portions 41a, 41b, 41c, and 41d for forming the folded portion, which are the areas between the one side welded portion 8 and the other side welded portion 9 that are adjacent in the horizontal direction, are cut by the slitter blade 56 of the slitter at a position between the one side welded portion 8 and the other side welded portion 9 (for example, a position midway between the two).

[0064] As a result, as shown in Figure 2(c), free edges 2a, 2c of the upper synthetic resin film 2 and free edges 3a, 3c of the lower synthetic resin film 3 are formed on the outer side in the horizontal direction of one side welded portion 8 (left side in Figure 2(c)) and the outer side in the horizontal direction of the other side welded portion 9 (right side in Figure 2(c)).

[0065] (Folding process) A folding means (e.g., a guide bar) 57 is provided on the downstream side in the flow direction of each slitter blade 56 (right side in Figures 1 and 3), and the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process described above are folded back to the upper side of the one side welded portion 8 and the upper side of the other side welded portion 9 by the folding means (e.g., a guide bar) 57, as shown in Figure 2(d).

[0066] This results in the formation of first folded portions 6a, 6b (FIGS. 2(d), 4(a)) extending in the longitudinal direction, with the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 overlapping on top of the upper synthetic resin film 2, as shown in FIG. 2(d).

[0067] Although not shown in Figure 2, a folding means (e.g., a guide bar) 57 can be used to fold back the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process to the below of the one side welded portion 8 and the below of the other side welded portion 9.

[0068] In this manner, the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 are overlapped under the lower synthetic resin film 3 to form second fold-back portions 7a, 7b (Figure 4(b)) extending in the longitudinal direction.

[0069] As explained in the slitting process above, in the region between one side welded portion 8 and the other side welded portion 9 adjacent in the horizontal direction, between the upper synthetic resin film 2 and the lower synthetic resin film 3 in the raw film portions 41a, 41b for forming the folded portion, the state in which the upper synthetic resin film 20 and the lower synthetic resin film 30 are stacked vertically to form the raw film 40 (Figure 2(a)) as shown in Figure 1 is maintained.

[0070] In order to fold two overlapping tapes (films) in this state, a complicated guide or process is required because of the presence of an air layer between them, but in this embodiment, as described above, the two sheets are combined into one, that is, the two sheets are continuously welded in the longitudinal direction (the direction in which the product flows) to form one-side welded portion 8 and the other-side welded portion 9. Thus, the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process are folded back at their boundary positions to the upper side of the one-side welded portion 8 and the upper side of the other-side welded portion 9 by folding back means (for example, a guide bar) 57, or to the lower side of the one-side welded portion 8 and the lower side of the other-side welded portion 9, so that folding back and folding can be continued stably in the longitudinal direction in which the one-side welded portion 8 and the other-side welded portion 9 are formed.

[0071] This makes it possible to uniformly and stably achieve narrow folding with a width (S) (FIGS. 5(a) and (b)) of about 1 mm to 3 mm.

[0072] (Crimping process) A first stretching roll stand 58 equipped with a first pressing roll is disposed downstream in the flow direction (right side in Figs. 1 and 3) of each of the turning back means (e.g., guide bars) 57. The first pressing roll is composed of, for example, an iron roll and a rubber roll.

[0073] Therefore, the edges 2a, 2c of the upper synthetic resin film 2 and the edges 3a, 3c of the lower synthetic resin film 3, which are folded back above the one-side welded portion 8 and above the other-side welded portion 9, are pressed against the one-side welded portion 8 and the other-side welded portion 9 by the first pressing roll of the first stretching roll stand 58.

[0074] Although not shown in Figure 2, when the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process are folded back to the below of the one-side welded portion 8 and the below of the other-side welded portion 9 by a folding back means (e.g., a guide bar) 57, the edges 2a, 2c of the upper synthetic resin film 2 and the edges 3a, 3c of the lower synthetic resin film 3 that are folded back to the below of the one-side welded portion 8 and the below of the other-side welded portion 9 are pressed against the one-side welded portion 8 and the other-side welded portion 9 by the first pressing roll of the first stretching roll stand 58.

[0075] 2(d) is a cross-sectional view with some parts omitted to explain the manufacturing process at the portion indicated by the symbol D in FIG. 1, and illustrates the state after the pressure bonding process has been performed; FIG. 4(a) is a cross-sectional view with some parts omitted to explain the manufacturing process in the state shown in FIG. 2(d), and FIG. 4(b) is a cross-sectional view with some parts omitted to explain another manufacturing process in the state shown in FIG. 2(d) (wherein the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slit process are folded back by a folding means (e.g., a guide bar) 57 to the underside of the one-side welded portion 8 and the underside of the other-side welded portion 9).

[0076] 2(d) and 4(a), for ease of understanding, gaps are shown to exist between the upper surface of the upper synthetic resin film 2 and the edges 2a, 2c of the upper synthetic resin film 2, and between the edges 2a, 2c of the upper synthetic resin film 2 and the edges 3a, 3c of the lower synthetic resin film 3. However, in reality, by passing through the first pressing roll of the first stretching roll stand 58, pressing is performed so that the edges 2a, 2c of the upper synthetic resin film 2 are in close contact with the upper surface of the upper synthetic resin film 2, and the edges 3a, 3c of the lower synthetic resin film 3 are in close contact with the edges 2a, 2c of the upper synthetic resin film 2.

[0077] In addition, for ease of understanding, Figure 4(b) is shown to show gaps between the lower surface of the lower synthetic resin film 3 and the edges 3a, 3c of the lower synthetic resin film 3, and between the edges 3a, 3c of the lower synthetic resin film 3 and the edges 2a, 2c of the upper synthetic resin film 2. However, in reality, by passing through the first pressing roll of the first stretching roll stand 58, the edges 3a, 3c of the lower synthetic resin film 3 are closely adhered to the lower surface of the lower synthetic resin film 3, and the edges 2a, 2c of the upper synthetic resin film 2 are closely adhered to the edges 3a, 3c of the lower synthetic resin film 3.

[0078] By carrying out this pressing step, the above-mentioned folding can be made more secure.

[0079] (Stretching process) After the pressing step, the film is stretched by passing through a heating means 59 located downstream of the first stretching roll stand 58 in the flow direction (the right side in FIG. 1) and a second pressing roll of a second stretching roll stand 60 located downstream of the heating means 59.

[0080] Here, stretching can be performed by the speed difference between the rotation speed of the first pressure roll of the first stretching roll stand 58 and the rotation speed of the second pressure roll of the second stretching roll stand 60 .

[0081] This forms the first folded portions 6a, 6b (Figs. 2(d) and 4(a)) into first folded portions 6c and 6d (Figs. 2(e) and 5(a)) extending in the longitudinal direction, or forms the second folded portions 7a, 7b (Fig. 4(b)) into second folded portions 7c and 7d (Fig. 5(b)) extending in the longitudinal direction.

[0082] 2(e) is a cross-sectional view with some parts omitted to explain the manufacturing process of the portion indicated by the symbol E in FIG. 1, and explains the state after the stretching process has been performed. FIG. 5(a) is a diagram explaining the positions of the width (W), the width (D) of the one-side welded portion and the other-side welded portion, and the width (S) of the first folded-over portion and the second folded-over portion in the binding tape of the present invention in the state shown in FIG. 2(e). FIG. 5(b) is a diagram explaining the positions of the width (W), the width (D) of the one-side welded portion and the other-side welded portion, and the width (S) of the first folded-over portion and the second folded-over portion in the binding tape of the present invention in another state shown in FIG. 2(e) (where the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process have been folded back to the underside of the one-side welded portion 8 and the underside of the other-side welded portion 9 by a folding back means (e.g., a guide bar) 57).

[0083] In these figures, for ease of understanding, the figures are illustrated as if there were gaps between the edge 2a of the upper synthetic resin film 2 and the edge 3a of the lower synthetic resin film 3, between the edge 2c of the upper synthetic resin film 2 and the edge 3c of the lower synthetic resin film 3, between the edge 3a of the lower synthetic resin film 3 and the edge 2a of the upper synthetic resin film 2, and between the edge 3c of the lower synthetic resin film 3 and the edge 2c of the upper synthetic resin film 2. However, in reality, by going through the above-mentioned stretching process, in Figures 2(e) and 5(a), the stretching process is performed so that the edges 2a, 2c of the upper synthetic resin film 2 are pressed against the upper surface of the upper synthetic resin film 2, and the edges 3a, 3c of the lower synthetic resin film 3 are pressed against the edges 2a, 2c of the upper synthetic resin film 2, while in Figure 5(b), the stretching process is performed so that the edges 3a, 3c of the lower synthetic resin film 3 are pressed against the lower surface of the lower synthetic resin film 3, and the edges 2a, 2c of the upper synthetic resin film 2 are pressed against the edges 3a, 3c of the lower synthetic resin film 3.

[0084] In this stretching process, the difference in rotation speed between the first pressure roll of the first stretching roll stand 58 and the second pressure roll of the second stretching roll stand 60 is, for example, 6.5 times, the heating temperature by the heating means 59 is set to 90°C, and the stretching process is performed at a stretch ratio of 6.5 times, and the resulting binding tape 1 as shown in Figures 2(e), 5(a), and (b) can be wound up by a winding machine 64.

[0085] As described above, the raw film 40 formed by laminating the upper synthetic resin film 20 and the lower synthetic resin film 30 has a width that is more than several times the width, indicated by W in Figures 5(a) and (b), of the binding tape 1 to be manufactured (Figures 5(a) and (b)). When eight binding tapes 1 (Figures 5(a) and (b)) are manufactured from the raw film 40, the tapes can be wound simultaneously in parallel onto eight cardboard tubes arranged in parallel in the winding machine 64, and can be wound into eight rolls of binding tape 1 that are easy to unwind when used.

[0086] Conventionally, when bundling is performed using bundling tape, the bundling tape roll is placed on the floor or the like and pulled out from the roll, in a "lay-down" manner. Even though the bundling tape is a flat cord, it is twisted, so the bundling is performed thinly.

[0087] To remedy this, a strapping machine manufacturer developed a strapping machine with a mechanism that rotates like a PP band and pays out the strapping tape, called a "rotating payout device," and this type of device is currently widely used in the cardboard industry.

[0088] The binding tape 1 (FIGS. 5(a) and 5(b)) of this embodiment manufactured through the above-mentioned steps is suitably used for this very "rotating payout (rotating take-up) device."

[0089] Through the above-mentioned process, for example, a long binding tape 1 having a width W of 35 mm to 40 mm and a thickness of 14 μ to 22 μ (thickness of upper synthetic resin film 2: 7 μ to 11 μ, thickness of lower synthetic resin film 3: 7 μ to 11 μ) can be produced.

[0090] By successively carrying out the above-mentioned folding, crimping, and stretching steps, the folded portions can be stably prevented from opening even if the widths (S) (FIGS. 5(a) and (b)) of the first folded portions 6c, 6d and the second folded portions 7c, 7d are small, being approximately 1 mm to 3 mm.

[0091] As for the folding process, in addition to the method of folding a wide raw roll before stretching as in the present embodiment described above, a method of folding after stretching is also possible, but in the latter case, the flow speed is faster (100 to 200 m / min) because it is after stretching. Therefore, it becomes more difficult to fold uniformly. In contrast, in the present embodiment, as described above, a series of folding is performed in the process before stretching, so that the folding can be performed uniformly.

[0092] (Embossing process) Before the binding tape 1 after the stretching step described above is wound up by the winder 64, an embossing step of embossing the surface with irregularities can be performed downstream in the flow direction, consecutively to the stretching step.

[0093] In the embodiment shown in FIG. 1, an annealing heating plate 61, an embossing roll 62, and a third stretching roll stand 63 are provided downstream of the second stretching roll stand 60 in the machine direction.

[0094] The sheet is subjected to an annealing heat relaxation treatment (65° C.) on an annealing heating plate 61. The sheet is then passed through an embossing roll 62 to apply an embossing process to the surface.

[0095] In this way, the stability of the folding in the stretching step can be more reliably ensured.

[0096] Embossing has the effect of fixing the folds even further so that they do not open up, and the folds can be fixed securely. This embossing effect increases the apparent thickness by making the surface uneven, which improves the fit when the tape is sandwiched between the rolls in the binding machine.

[0097] In addition, when applying surface embossing to ensure stability of the folds, it is desirable to apply surface embossing at least to the areas where the first folded portions 6c, 6d of the binding tape 1 are formed and the areas where the second folded portions 7c, 7d are formed. <Examples of binding tape> The binding tape of this embodiment, manufactured through the above-mentioned process, is, as described above, a stretched binding tape made from a film (two plies) formed by inflation extrusion molding, which is stretched to give it strength.

[0098] The binding tape of this embodiment has high abrasion resistance (prevents fuzzing) during use because the folded ends of the product do not open at the end faces of the roll.

[0099] An example of the binding tape of this embodiment manufactured through the above-mentioned steps and an example of the product are as follows. Width (unfolded): 40mm Width: 37mm (including folds) Thickness: 18μ (Upper synthetic resin film thickness: 9μ, Lower synthetic resin film thickness: 9μ) Fineness: 6400De(7100Dtex) Strength: 250N Elongation: 25% Roll shape: Rolled up into a cylindrical shape (paper tube inner diameter: 50.8 mm x length: 200 mm). Product A: Weight: 4.0kg roll Tape length: 5620m / roll Outer diameter of rolled product: 195mm Product B: Weight: 4.8kg / roll Tape length: 6700m / roll Outer diameter of rolled product: 220mm

[0100] Thus, in one embodiment of the binding tape of this embodiment, which is manufactured through the above-mentioned process, the product width is 35 mm to 40 mm, and the folds on both sides are folded as narrowly and evenly as possible, making the product difficult to open.

[0101] The amount of folding can be controlled within 1 to 2 mm. The width of the finished product can be set to 35 to 40 mm, which is more than 20% wider than the conventional #50 type (tape width: 50 mm, folded width: 30 mm) that was offered to the market with about 40% of the tape width folded in, as explained in the "Problems to be Solved by the Invention" section.

[0102] Furthermore, the conventional #50 described in the section "Problems to be Solved by the Invention" had physical properties of 8000 denier (DE), 0.88 g / m, 8800 Dtex, 0.71 g / m, and tape tensile strength: 250 N, whereas the binding tape of this embodiment (width (unfolded): 40 mm, width: 37 mm (folded)) produced by the manufacturing process of this embodiment described above has properties of 6400 denier, 0.71 g / m, 7100 Dtex, and tape tensile strength: 250 N, making it possible to reduce the weight per unit (amount used) by 20% while maintaining the physical properties of the conventional #50.

[0103] This provides excellent binding properties and prevents the tape from digging into products, and even when discarded after use, it is expected to reduce CO2 emissions by 20%, making it a product that can help protect the global environment and reduce carbon dioxide emissions.

[0104] The structure and form of the binding tape of the present invention that can be produced as described above will be described below with reference to FIG.

[0105] The binding tape 1 is made up of two extremely thin, long, strip-shaped synthetic resin films, an upper synthetic resin film 2 and a lower synthetic resin film 3, which are laminated one above the other.

[0106] The binding tape 1 has two side edges in the horizontal direction perpendicular to the longitudinal direction of the binding tape 1, namely, one side edge 4 of the binding tape and the other side edge 5 of the binding tape, where the respective horizontal edges 2a, 3a, 2c, 3c of the two synthetic resin films overlap the upper synthetic resin film 2, forming first folds 6c, 6d extending in the longitudinal direction (Figure 5(a)).

[0107] Alternatively, in the binding tape 1, second folded portions 7a, 7b extending in the longitudinal direction are formed at each of the two side edges in the horizontal direction perpendicular to the longitudinal direction of the binding tape 1, that is, the binding tape one side edge 4 and the binding tape other side edge 5, where the respective lateral end edges 2a, 3a, 2c, 3c of the two synthetic resin films overlap under the lower synthetic resin film 3 (Figure 5(b)).

[0108] Here, the upper synthetic resin film 2 and the lower synthetic resin film 3 in the first folded-over portions 6c, 6d and the second folded-over portions 7c, 7d are welded to each other, so that a one-side welded portion 8 extending in the longitudinal direction is formed on one side edge 4 of the binding tape, and an other-side welded portion 9 extending in the longitudinal direction is formed on the other side edge 5 of the binding tape (Figures 5(a) and (b)).

[0109] In addition, the upper synthetic resin film 2 and the lower synthetic resin film 3, which are layered above and below the binding tape 1, are welded only at one side welded portion 8 and the other side welded portion 9 (Figures 5(a) and (b)).

[0110] Thus, the binding tape 1 of this embodiment is formed by laminating an upper synthetic resin film 2 and a lower synthetic resin film 3, each long in the longitudinal direction, vertically, and is provided with a one-side welded portion 8 and an other-side welded portion 9 extending in the longitudinal direction, which are welded to each other only at the binding tape one-side edge 4 and the binding tape other-side edge 5, which are two side edges in the lateral direction perpendicular to the longitudinal direction, and first folded-over portions 6c, 6d extending in the longitudinal direction are formed above the one-side welded portion 8 and above the other-side welded portion 9. Alternatively, the binding tape 1 of this embodiment is provided with a one-side welded portion 8 and an other-side welded portion 9 extending in the longitudinal direction, which are welded to each other only at the binding tape one-side edge 4 and the binding tape other-side edge 5, which are two side edges in the lateral direction perpendicular to the longitudinal direction, and second folded-over portions 7c, 7d extending in the longitudinal direction are formed below the one-side welded portion 8 and the other-side welded portion 9.

[0111] Therefore, the end surface of the roll of binding tape 1 has high abrasion resistance (prevention of fuzzing) during use.

[0112] In the binding tape 1 having the structure described above, the first folded portion edge 6e, which is the edge on the side of the binding tape one side edge 4 of the first folded portion 6c, 6d and extends in the longitudinal direction, and the first folded portion edge 6f, which is the edge on the side of the binding tape other side edge 5, which extends in the longitudinal direction, form the binding tape one side edge 4a at the binding tape one side edge 4 of the binding tape 1 and the binding tape other side edge 5a at the binding tape other side edge 5 of the binding tape (Figure 5(a)).

[0113] Alternatively, as described above, when the second folded portions 7c, 7d are formed, the second folded portion edge 7e, which is the edge on the side of the one side edge 4 of the binding tape in the second folded portions 7c, 7d and extends in the longitudinal direction, and the second folded portion edge 7f, which is the edge on the side of the other side edge 5 of the binding tape and extends in the longitudinal direction, form the binding tape one side edge 4a at the binding tape one side edge 4 of the binding tape 1 and the binding tape other side edge 5a at the binding tape other side edge 5 of the binding tape 1 (Figure 5(b)).

[0114] It has been explained that in the "folding process" of the invention of the manufacturing method described above, the upper synthetic resin film 2 and the lower synthetic resin film 3 are combined into one piece, i.e., the upper synthetic resin film 2 and the lower synthetic resin film 3 are continuously welded in the longitudinal direction (the direction in which the product flows) to form one side welded portion 8 and the other side welded portion 9, and the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process are folded back to the above of the one side welded portion 8 and to the above of the other side welded portion 9 by a folding means (e.g., a guide bar) 57 at the boundary position with the one side welded portion 8 and the boundary position with the other side welded portion 9, or folded back to the below of the one side welded portion 8 and to the below of the other side welded portion 9, thereby making it possible to continue folding back and folding stably in the longitudinal direction in which the one side welded portion 8 and the other side welded portion 9 are formed.

[0115] And, by being manufactured in this manner, the end surface of the roll of the binding tape 1 has high abrasion resistance (prevention of fuzzing) during use.

[0116] This structure is realized by folding back the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process described above at the boundary position with the one-side welded portion 8 and the boundary position with the other-side welded portion 9.

[0117] In the binding tape 1 having the structure described above, the edges 2a, 3a on the lateral side of the binding tape one side edge 4 of the one side welded portion 8 and extending longitudinally from the one side welded portion side edge 8a to form the first folded portion 6c are folded back onto the upper synthetic resin film 2.

[0118] In addition, the edges 2c, 3c of the two synthetic resin films extending in the longitudinal direction and located on the side of the other side edge 5 of the binding tape of the other side welded portion 9 and forming the first folded portion 6d from the other side welded portion side edge 9a are folded back onto the upper synthetic resin film 2.

[0119] Alternatively, as described above, when the second folded-over portions 7c, 7d are formed, the edges 2a, 3a on the side of the one side edge 4 of the binding tape in the lateral direction of the two synthetic resin films forming the second folded-over portion 7c from the one side welded portion side edge 8a, which extends in the longitudinal direction and is located on the side of the one side edge 4 of the binding tape of the one side welded portion 8, are folded back under the lower synthetic resin film 3.

[0120] The edges 2c, 3c of the two synthetic resin films which extend longitudinally and are located on the side of the other side edge 5 of the binding tape of the other side welded portion 9 and form the second folded portion 7d from the other side welded portion side edge 9a are folded back under the lower synthetic resin film 3.

[0121] It has been explained that in the "folding process" of the invention of the manufacturing method described above, the upper synthetic resin film 2 and the lower synthetic resin film 3 are combined into one piece, i.e., the upper synthetic resin film 2 and the lower synthetic resin film 3 are continuously welded in the longitudinal direction (the direction in which the product flows) to form one side welded portion 8 and the other side welded portion 9, and the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process are folded back to the above of the one side welded portion 8 and to the above of the other side welded portion 9 by a folding means (e.g., a guide bar) 57 at the boundary position with the one side welded portion 8 and the boundary position with the other side welded portion 9, or folded back to the below of the one side welded portion 8 and to the below of the other side welded portion 9, thereby making it possible to continue folding back and folding stably in the longitudinal direction in which the one side welded portion 8 and the other side welded portion 9 are formed.

[0122] And, by being manufactured in this manner, the end surface of the roll of the binding tape 1 has high abrasion resistance (prevention of fuzzing) during use.

[0123] This structure is realized by folding back the free edges 2a, 2c of the upper synthetic resin film 2 and the free edges 3a, 3c of the lower synthetic resin film 3 formed in the slitting process described above at the boundary position with the one-side welded portion 8 and the boundary position with the other-side welded portion 9.

[0124] Furthermore, in the binding tape 1 having the above-described structure, the area where the first folded portions 6c, 6d of the binding tape 1 are formed is subjected to a surface unevenness embossing process. Alternatively, as described above, when the second folded portions 7c, 7d are formed, the area where the second folded portions 7c, 7d of the binding tape 1 are formed is subjected to a surface unevenness embossing process.

[0125] The uneven embossing process ensures that the folds are more stable. The embossing process has the effect of fixing the folds so that they do not open, and the folds are fixed firmly. The embossing effect increases the apparent thickness by applying unevenness to the surface, which also improves the suitability of the tape when it is sandwiched between the rolls in the binding machine.

[0126] In the binding tape 1 having the above-mentioned structure, the thicknesses of the upper synthetic resin film 2 and the lower synthetic resin film 3 can each be in the range of 7μ to 11μ. Therefore, the binding tape 1 formed by laminating the upper synthetic resin film 2 and the lower synthetic resin film 3, which are long in the longitudinal direction, one above the other, has a thin thickness in the range of 14μ to 22μ.

[0127] In addition, the width (W) of the binding tape 1, which is the horizontal length of the binding tape 1, can be in the range of 35 mm to 40 mm, the width (D) of the one side welded portion 8 and the other side welded portion 9 can be in the range of 1 mm to 3 mm, and the width (S) of the first folded portion 6c, 6d and the second folded portion 7c, 7d can be in the range of 1 mm to 3 mm.

[0128] In any case, the binding tape 1 of this embodiment is formed by laminating an upper synthetic resin film 2 and a lower synthetic resin film 3, each long in the longitudinal direction, one above the other, and is provided with a one-side welded portion 8 and an other-side welded portion 9 extending in the longitudinal direction, which are welded to each other only at the two side edges in the lateral direction perpendicular to the longitudinal direction, that is, the binding tape one-side side edge 4 and the binding tape other-side side edge 5, respectively, and first folded-over portions 6c, 6d extending in the longitudinal direction are formed above the one-side welded portion 8 and above the other-side welded portion 9. The cable tie has a one-side welded portion 8 and an other-side welded portion 9 extending in the longitudinal direction, which are welded to each other only at two horizontal sides in the horizontal direction perpendicular to the longitudinal direction, i.e., at one side edge 4 of the cable tie and the other side edge 5 of the cable tie, and second folded portions 7c, 7d extending in the longitudinal direction are formed below the one-side welded portion 8 and the other side welded portion 9, thereby improving the abrasion resistance (prevention of fuzzing) of the end surface of the cable tie roll when in use.

[0129] As explained in the section entitled "Problems to be Solved by the Invention," compared to conventional binding tapes which are sold on the market with approximately 40% of their width folded over, binding tape 1 has a very narrow fold in the width direction, which prevents the folds at the end of the product at the end face of the roll from unfolding, and it has high abrasion resistance (prevents pilling) during use.

[0130] Although the embodiments and examples of the present invention have been described above, the present invention is not limited to the above-described embodiments and examples, and can be modified in various ways within the technical scope understood from the description of the claims.

Claims

1. The bundling tape is formed by stacking two extremely thin, strip-shaped, long synthetic resin films, an upper synthetic resin film and a lower synthetic resin film, one above the other, The binding tape extends in the longitudinal direction, and has two side edges in a lateral direction perpendicular to the longitudinal direction, i.e., a side edge on one side of the binding tape and a side edge on the other side of the binding tape. The two synthetic resin films have their respective lateral edges overlapping the upper synthetic resin film to form a first fold-over portion extending in the longitudinal direction; or the respective edges of the two synthetic resin films in the lateral direction overlap under the lower synthetic resin film to form a second folded portion extending in the longitudinal direction; the upper synthetic resin film and the lower synthetic resin film in the first folded-over portion and the second folded-over portion are welded to each other, and a one-side welded portion extending in the longitudinal direction is formed on one side edge of the binding tape, and a second-side welded portion extending in the longitudinal direction is formed on the other side edge of the binding tape, The upper synthetic resin film and the lower synthetic resin film, which are laminated vertically, are welded only at the one-side welded portion and the other-side welded portion. Binding tape.

2. a first folded-over portion edge that is an edge of the one side edge of the binding tape in the first folded-over portion and extends in the longitudinal direction, and a first folded-over portion edge that is an edge of the other side edge of the binding tape in the longitudinal direction form the binding tape one side edge at the binding tape one side edge of the binding tape and the binding tape other side edge at the binding tape other side edge of the binding tape, or a second folded-over portion edge that is an edge on one side edge of the binding tape in the second folded-over portion and extends in the longitudinal direction, and a second folded-over portion edge that is an edge on the other side edge of the binding tape in the longitudinal direction form a binding tape one side edge at the binding tape one side edge of the binding tape and a binding tape other side edge at the binding tape other side edge of the binding tape. The binding tape of claim 1.

3. an edge of the two synthetic resin films forming the first folded-over portion from an edge of the one-side welded portion in the longitudinal direction, the edge being located on the side of the one-side edge of the binding tape, is folded back onto the upper synthetic resin film; The edge of the two synthetic resin films that form the first folded-over portion from the edge of the other side welded portion in the longitudinal direction and that is located on the side of the other side edge of the binding tape of the other side welded portion is folded back onto the upper synthetic resin film, or The edge of the two synthetic resin films that form the second folded portion from the edge of the one-side welded portion in the longitudinal direction and that is located on the side of the one-side edge of the binding tape in the lateral direction is folded back under the lower synthetic resin film, The other side edge of the two synthetic resin films forming the second folded portion from the other side welded portion side edge of the other side welded portion extending in the longitudinal direction is located on the other side edge of the binding tape, and the other side edge of the two synthetic resin films is folded back under the lower synthetic resin film.

3. The binding tape according to claim 1 or 2.

4. The binding tape has a surface texture embossed in an area where the first fold is formed, or The area of ​​the binding tape where the second folded portion is formed is embossed with a concave-convex surface. The binding tape according to claim 1 or 2.

5. 3. The binding tape according to claim 1, wherein the thickness of said upper synthetic resin film and said lower synthetic resin film is 7 μm to 11 μm.

6. The binding tape according to claim 1 or 2, wherein the width (W) of the binding tape, which is the horizontal length of the binding tape, is 35 mm to 40 mm, the width (D) of the one side welded portion and the other side welded portion is 1 mm to 3 mm, and the width (S) of the first folded portion and the second folded portion is 1 mm to 3 mm.

7. A method for manufacturing a thin-walled binding tape made of synthetic resin, the thin-walled binding tape being long in a longitudinal direction and having a predetermined width in a lateral direction perpendicular to the longitudinal direction, comprising the steps of: a weld portion forming process for passing a raw material film, which is formed by stacking an upper synthetic resin film and a lower synthetic resin film, which are two extremely thin synthetic resin films elongated in the longitudinal direction and have a width in the transverse direction that is more than multiple times the width of the binding tape to be manufactured, through a plurality of heated rotating rolls arranged at a predetermined interval between each other in the transverse direction, in a flow direction extending in the longitudinal direction, to form a plurality of one-side weld portions and other-side weld portions extending in the longitudinal direction at a predetermined interval between each other in the transverse direction, where the upper synthetic resin film and the lower synthetic resin film are welded, at positions where one side edge of the binding tape and the other side edge of the binding tape to be manufactured, which are two side edges of each of the binding tapes to be manufactured, are formed; a slitting process in which the upper synthetic resin film and the lower synthetic resin film between the one-side welded portion and the other-side welded portion adjacent to each other in the transverse direction are cut by a slitter blade of a slitter at a position between the one-side welded portion and the other-side welded portion to form a free edge of the upper synthetic resin film and a free edge of the lower synthetic resin film on the outer side in the transverse direction of the one-side welded portion and the outer side in the transverse direction of the other-side welded portion, respectively; a folding step of folding back the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film to the upper side of the one-side welded portion and the upper side of the other-side welded portion by a folding back means located downstream of the slitter blade in the flow direction, thereby overlapping the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film onto the upper synthetic resin film to form a first folded back portion extending in the longitudinal direction, or folding back the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film to the lower side of the one-side welded portion and the lower side of the other-side welded portion to overlap the free edge of the upper synthetic resin film and the free edge of the lower synthetic resin film underneath the lower synthetic resin film to form a second folded back portion extending in the longitudinal direction; a pressure-bonding step in which the edge of the upper synthetic resin film and the edge of the lower synthetic resin film, which are folded back above the one-side welded portion and above the other-side welded portion, are pressed against the one-side welded portion and the other-side welded portion by a first pressure-bonding roll of a first stretching roll stand located downstream of the folding means in the flow direction, or the edge of the upper synthetic resin film and the edge of the lower synthetic resin film, which are folded back below the one-side welded portion and below the other-side welded portion, are pressed against the one-side welded portion and the other-side welded portion by a first pressure-bonding roll of a first stretching roll stand located downstream of the folding means in the flow direction; a stretching step in which, after the pressing step, the sheet is passed through a heating means located downstream of the first stretching roll stand in the flow direction and a second pressing roll of a second stretching roll stand located downstream of the heating means, thereby performing stretching by a speed difference between the rotation speed of the first pressing roll and the rotation speed of the second pressing roll, thereby forming the first folded-back portion into a first folded-over portion extending in the longitudinal direction, or forming the second folded-back portion into a second folded-over portion extending in the longitudinal direction; Equipped with The region defined between the one-side welded portion and the other-side welded portion formed in the welded portion forming step is a raw material film portion for manufacturing a unit binding tape, which is long in the longitudinal direction and has a width in the transverse direction corresponding to the width of the binding tape to be manufactured, Between the one-side welded portion of one of the raw film portions for manufacturing a unit bundling tape that are adjacent in the transverse direction among the prepared raw film portions for manufacturing a unit bundling tape, and the other-side welded portion of the raw film portion for manufacturing another unit bundling tape, a raw film portion for forming a folded portion used to form the first folded portion or the second folded portion is provided. Become A method for manufacturing binding tape.

8. 8. The method for producing a binding tape according to claim 7, further comprising the step of: performing an embossing process for providing a surface irregularity embossing process on the downstream side of the flow direction subsequent to the stretching process.

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