KR20000016989A - Packaging strap coil and method for producing the same, packaging strap coil unit and packaging machine equipped with strap coil reel - Google Patents

Abstract

PURPOSE: A string coil for packaging is provided to be used for binding a variety of articles as well as to consist of a string for packaging thermoplastic synthetic resin which is rolled as a spiral type. CONSTITUTION: The string coil is produced by the steps of:rolling an extreme internal angle(11a) on a roller(31) and laminating multi layers on an end of the extreme internal angle string; forming a punch hole(11d) and melting its circumference by punching the laminated string layer with a punch which is heated at the previously set temperature; withdrawing the punch from the laminated string layer to melt-bond the circumference of the punch hole; forming a string coil(11) by rolling a string on the roller as much as needed; and eliminating the roller from the string coil.

Description

PACKAGING STRAP COIL AND METHOD FOR PRODUCING THE SAME, PACKAGING STRAP COIL UNIT AND PACKAGING MACHINE EQUIPPED WITH STRAP COIL REEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping string coil composed of spirally wound thermoplastic synthetic resin wrapping strings and used to hold various articles and a method of manufacturing the same. The present invention also relates to a wrapping string coil device comprising a string coil and further to a wrapping machine with a string coil reel for loading the string coil in an automatic packaging machine.

Tapes, such as thermoplastic resin packaging straps, are used to hold corrugated cardboard boxes or similar items. The synthetic resin strap can be prepared by extrusion-moulding in the form of a flat tape which usually requires an olefinic thermoplastic synthetic resin (ie, polypropylene, polyethylene terephthalate). The pulling and stretching of the synthetic resin is carried out at a speed exceeding the extrusion rate. The stretched plastic string is spirally wound on a tubular paper core to form an arbitrary string coil.

The string coil, together with the tubular paper core, is loaded into an automatic packaging machine. There, any string is pulled continuously to hold a corrugated cardboard or similar. When the string is used in the string coil, it constitutes a tubular paper core. The paper core may be damaged by the string and may not be reused as the core of the wrapping string coil. If the paper core is pulled with synthetic resin-based adhesives, it may not be possible to make even the material for recycled paper. Tubular paper cores that are no longer available as material for any paper core or recycled paper are merely discarded. However, in processing the paper core, there is still a need for transportation and waste disposal.

In view of the above problems, Japanese Patent Publication No. 315690/1995 (JP-A-7-315690)

Describes a coreless wrapping string coil and a method of making the same, wherein the wrapping string is spirally wound without paper or cores. As shown in Figures 57 and 58, the coreless string coil 205 has a cylindrical hollow 206 in its axis. The innermost end of string 204 has another layer of string lying on top of it and is melt-bonded in melt-bonded region 241.

To make this string coil, the string 204 is wound around a winding roller 201 comprising a pair of detachable right / left roller components 203, 213. Initially, the beginning of the string 204 is wound in one rotational direction along the axial length core of the winding roller 201 including the right / left roller components 203, 213. The string 204 then lays another layer thereon. The stacked string layers are melted and bonded to each other by applying heated iron, thereby forming the melt-bonding region 241. The innermost end of the string 204 is fixed and the predetermined length of the string 204 is wound around the entire surface of the winding roller 201 to form a string coil. Finally, the right / left roller components 203, 213 of the winding roller 201 are separated and moved out of the string coil. Thus, a wrapping string coil 205 without a core is obtained.

In such wrapping string coils, the fixed innermost end of the string is not pulled into the hollow in the shaft. Thus, the string coil remains firm and firm during transportation.

When this string coil is loaded into any automatic packaging machine, the string is pulled from the outermost end and used to hold the corrugated cardboard box or the like.

As mentioned above, the heated iron is used to heat a predetermined area in the laminated string wound on a winding roller, so that the laminated string portions are melted and bonded together. However, when iron did not provide a stable heating temperature, the bonding strength of the laminated string layer may vary from one group to another. The innermost end of the string used is too tightly bonded, ie the melt-bonded region supplied has too high separation strength and will not easily separate when the bonding region is used in the packaging machine. In some cases, the string may be partially peeled off in tightly bonded areas. Precisely, when any string coil is loaded into the automatic packaging machine, the string is pulled in accordance with the rotation of the feed roller. If the laminated string layers are bonded too tightly, the feed rollers will not separate the string layers, and worse, they will break themselves by subjecting to rotational power.

The prior art string coils specify more drawbacks. When any string coils stack any string in the form of a spiral, it expands slightly in the axial direction. Although the innermost end of the string is combined into one layer or layers stacked thereon, the remainder of the innermost row of the string coils on the axis adjacent to the bonded string ends are separated for the layer stacked thereon. Such string coils may be released or collapsed in the non-bonding region.

In transportation or storage, the prior art string coils are laid horizontally and stacked on top of each other in a vertical axis, as shown in FIG. Usually, a pair of string coils 101 are stored perpendicular to a package (shown as a virtual line). Each string coil 101 has a naturally uneven side, with the edge of the string 101a protruding in several layers. When a plurality of string coils 101 are placed on top of each other in the vertical axial direction, as shown in FIG. 55, the edge of the string 101a protruding from the side of the string coil 101 may be bent or deformed. have. The string coil 101, which has a curved or deformed rim, will not be safely and smoothly supplied with the string 101a in an automatic packaging machine.

In order to protect any string coil side, the string coil 101 is transported or stored in the form of a conventional string coil device shown in FIG. 56, which is a pair of discs used on each side of the string coil 101 Pad 102. Each disc pad 102 is made of cardboard and is formed with a core hole 102a corresponding to the cylindrical hollow 101a at the axis of the string coil 101. The pair of pads 102 are integrally coupled to the side of the string coil 101 by a plurality of strings 103. Each string 103 passes axially past the hollow of the string coil 101 and the hole in the pad 102 and then on the axis transverse to the cylindrical outer surface of the string coil 101. ) And pads 102 are bundled together.

Since the cardboard pad 102 covers both sides of the string coil 101, even if the edge of the string 101a is unevenly protruded or recessed, it is protected from deformation or damage.

Nevertheless, the manufacture of such wrapping string coil devices is not a simple technique, because the process places the pads 102 on both sides of the string coil 101 and then puts them together with multiple strings 103. Because it requires binding.

In an automatic packaging machine equipped with any string coil reel and automatically operated for wrapping articles, the string coil reel usually adjusts any string coil including the string wound around a tubular paper core. The string coil bobbin includes a core element inserted into and supporting the paper tube. The core element consists of a cylindrical structure consisting of a cylinder with a diameter slightly smaller than the inner diameter of the paper tube, and three parallel rods supporting the cylindrical inner surface of the paper tube where three parallel rods are placed at regular intervals on the arc. A three-parallel-rod structure can be adopted. When the core coil bobbin core element holds any tubular paper core, the string coil bobbin is rotated by the inertial force generated while the string is pulled from the string coil by the feed roller.

Unfortunately, in inserting the core element into the hollow of the coreless string coil, the friction of the core element can lead to the string coil being released or collapsed at its cylindrical inner surface. In addition, this core element cannot be used for a coreless string coil having a modified elliptical cross section, so that an elliptical hollow is often observed during or after transportation of the string coil. If the core element of the string coil bobbin cannot be inserted inside the deformed hollow, it is impossible to load any string coil deformed on the string coil bobbin.

In fact, if the core element comprises three parallel rods and a pair of flat plates, it can enter any string coil cavity with a slightly modified elliptical cross section. Nevertheless, under such circumstances, the cylindrical inner surface of the string coil around the deformed hollow cannot equally receive the dispersed force on the arc. As a result, when the string coil becomes thinner and is loaded on the core element of three parallel rod structures or flat plate structures, the hollow of the string coil may be further deformed to become a triangular cross section or a square cross section, respectively. As a result, the string coil reel cannot smoothly pull any string from the string coil.

In addition, the string coil reel does not pull the last part of the string for other reasons. Since the rotation of the string coil reel is dependent on the inertia force generated when the string is pulled, when the string coil becomes thinner, the string constituting the string coil may be engaged with the core element and entangled or collapsed. Furthermore, when the string coil reel is installed on the outer surface of the automatic packaging machine, there is little possibility that the operator is damaged. For coreless string coils the melt-bonded ends may be separated from the bonded layer and, at the operator, may bounce back violently with rotation of the string coils.

In order to solve the above problems, the present invention provides a wrapping string coil and a manufacturing method thereof, wherein the innermost end of the string is firmly fixed to prevent the string coil from being unwound or disassembled. When used to hold any item, it is pulled smoothly to the very last end.

It is yet another object of the present invention to provide a wrapping string coil device, where it effectively prevents deformation and bending at the rim of the string forming the side of the wrapping string coil, including the spirally wound string. In addition, this string coil device is manufactured by a simple method.

It is yet another object of the present invention to provide a wrapping machine with a string coil reel, in which the undeformed, coreless string coil can be loaded onto the string coil reel while keeping it firmly wound. With this string coil reel, the string can be safely and reliably wound up to the last end.

In view of the above-mentioned object, the present invention provides a packaging string coil consisting of a plurality of layers of packaging strings wound spirally and without a core around the hollow defined by the axis of the string coil, and on its outer surface at least a cord composed of thermoplastic synthetic resin. A plurality of holes are drilled near the innermost end of the string, through which there are a plurality of layers of strings stacked thereon, wherein the layers of layers are stacked on each other in each melt-bonded region formed along the surface of each hole. Combined. In such wrapping string coils, it is desirable to supply a plurality of holes drilled through the plurality of stacked string layers below and around the outermost end of the string.

It should be understood that the thermoplastic synthetic resin packaging straps used in the present invention consist of at least thermoplastic synthetic resin. This means that the string may consist only of thermoplastic synthetic resin. However, in another aspect, the string may consist of fibers, paper, or the like, and its surface may be coated with thermoplastic synthetic resin.

In addition, in the wrapping string coil, the hole is appropriately set according to the circumferential length, arrangement, and position thereon as well as a plurality of laminated string layers while the hole is expanded. These parameters are determined in terms of the raw material, thickness, and width of the packaging strap. Therefore, the laminated string layers show balanced bonding strength and separation strength.

As described above, the string coil of the structure is characterized in that the layers stacked around the innermost end of the string are bonded to each other in the melt-bonded region. The melt-bonded region provides stable bond strength and serves as the core of the string coil. As a result, the string coil is not loosened or decomposed in the cylindrical inner surface. In addition, the string can be stably stacked on the joined layers to form a rigid, any string coil.

When the holes are fed through a plurality of layers of strings lying down around the outermost end of the string, the string will not loosen from the outermost end. This arrangement thus avoids the problem of fixing the outermost end of the string by gluing or thermally melting-bonding.

The holes are thoughtfully designed to balance the bond strength and the separation strength in the bonded layers of the string. Thus, on the other hand, they are bonded to each other with stable bonding strength in the melt-bonding region formed along the periphery of the laminated string. On the other hand, in the use of the string coil, the bonded string layers are not forcibly peeled off, but instead are properly separated in the melt-bonded region.

In this regard, the present invention provides a method for producing the string coil, which consists of the following steps:

Winding the innermost end of the string to a winding roller and laminating a plurality of layers on the innermost end of the string;

Drilling holes in the string layers laminated with a perforator heated at a predetermined temperature;

Withdrawing the perforator from the stacked string layers to the melt-bonded portion of the hole major surface;

Winding the strap of the required length in a spiral fashion on a winding roller to form an optional strap; And

The winding roller is moved from the string coil.

In the manufacturing method, the winding roller may be advanced or retracted in the radial direction. The diameter of the winding roller is enlarged while the string is wound thereon to form a string coil. After that, the winding roller is contracted in the radial direction and moved from the string coil.

In addition, the perforator may be in the form of a needle or a plate.

In addition, the present invention provides another method of making any wrapping string coil consisting of the following steps:

Winding the innermost end of the string on any winding roller and laminating a plurality of layers on the innermost string;

Firing a laser beam over the stacked string layers to form a hole and melt-bond its periphery;

Winding a string of the required length spirally on a winding roller to form a string coil; And

The winding roller is moved from the string coil.

In this manufacturing method, too, the winding roller may be advanced or retracted in the radial direction. The diameter of the winding roller is advanced while the string is wound thereon to form any string coil. Thereafter, the winding roller is retracted in the radial direction and moved from the string coil.

In one of the above manufacturing methods, it is important to set the circumferential length, placement and position of the hole as well as a plurality of laminated string layers while the hole is expanded. These parameters are determined by the raw material, thickness and width of the packaging strap. Thus, the laminated string layers exhibit balanced bond strength and peel strength.

In this method of manufacture, the needle-shaped perforator provides a circular cross-section hole, and the plate-shaped perforator provides a rectangular cross section or another cross section corresponding to the cross section of the perforator. Additionally, laser beam firing provides holes of smaller diameter by moving the components within the firing area. In another embodiment, compared to the use of a needle- or plate-shaped drill, there is less need for components that can be magnified by applying the laser beam.

In another aspect, the present invention provides a plurality of layers of packaging straps which are helical and have no core wound around the hollow defined by the axis of the string coils, and any string of coils on its outer surface comprising at least a cord made of thermoplastic synthetic resin. And wherein a portion of the string consisting of a cylindrical inner surface around the hollow is joined by an adhesive so as to be detachable to another portion of the string.

In such a string coil, the adhesive-bonding can be carried out in various ways. For example, some of the helically wound strings around the hollow are detachably joined by an adhesive to another part of the string laminated to their top surface. Alternatively, the multiple layers of the string stacked along each axial end of the hollow are detachably joined to each other by an adhesive. In addition, the plurality of adjacent rows of spirally wound straps may be detachably joined to each other by an adhesive applied on a cylindrical inner surface around the hollow.

The adhesive of the above embodiment may be a solvent-type or hot-melt type.

melt-type).

In addition, another method of making a packaging string coil consists of the following steps:

Spirally winding the innermost end of the string onto the winding roller to form an innermost end string layer;

Applying an adhesive to the top surface of the string wound on a winding roller;

Winding a string of the required length spirally on the glued portion of the string to form any string coils; And

And moving the winding roller from the string coil.

In the above production method, the adhesive is applied by applying pressure to the coating roller of the applicator against the innermost string layer wound on the winding roller. Instead, the adhesive is continuously injected between the innermost string of layers wound on a winding roller and any string laminated thereon with the use of an applicator moving along the latter.

In addition, another method of making a packaging string coil consists of the following steps:

Applying an adhesive on the plurality of laminated string layers along each axial end of the winding roller, and winding the innermost end of the string onto the winding roller;

Winding the string of length necessary to form any string coils; And

The winding roller is moved from the string coil.

Here, the adhesive can be sprayed on the string layers laminated along each axial end of the winding roller.

Now, the wrapping coil device of the present invention will be described. Packaging String Coil Unit:

Any spiral wrap and without a core wound around a hollow confined to the axis of the string coil, including a wrapping strap, and the strap made of at least thermoplastic synthetic resin on its outer surface, and

It consists of a pair of disc-shaped pads which are centered in the same position and detachably bonded to each side of the string coil by an adhesive.

In such a string coil arrangement, each pad comprises a plurality of central flaps nested in a hollow defined at the center of the string coil, at their center. Preferably, each pad may comprise a plurality of outer flaps nested on its outer arc, over the cylindrical outer surface of the string coil.

Another packaging string coil device of the present invention is a packaging string coil comprising a wrapping string coiled in a spiral and without a core around any hollow defined on the axis of the string coil, and made of at least thermoplastic synthetic resin on its outer surface. Including the string; And a frame holding plate substantially covering the inner surface of the cylinder around the hollow. When the frame holding plate is rotated and inserted into the hollow of the string coil, it can support the cylindrical inner surface of the string coil with elastic force in the non-rotating direction. Firstly, the frame holding plate has portions interconnectable at respective longitudinal ends. In addition, the frame holding plate may include a pair of slits formed adjacent to and parallel to one side of the width direction, and a pair of protrusions protruding from the side of the other width direction. When the frame holding plate is rotated and inserted into the hollow, the protrusions fit into the slits. In addition, the frame holding plate may include a plurality of edge pieces provided on each longitudinal side thereof to maintain the widthwise edge of the string coil.

Finally, the packaging machine will be described. The packaging machine of the present invention is a helical coil that wraps without a core around a hollow confined to the axis of a string coil, and any string coil that adjusts any wrapping string coil consisting of a string made of at least thermoplastic synthetic resin on its outer surface. Equipped. While the packaging machine automatically grasps any items, the string is pulled in accordance with the rotation of the string coil. The coil coil bobbin can be at least radially contracted at one end thereof for insertion into the hollow of the string coil and has a cylindrical frame having a circular cut surface to be pressed against a portion of the string which forms a cylindrical inner surface around the hollow. Thereby including a core element that may extend radially in the hollow.

For a preferred packaging machine with a string coil reel, the core element comprises a plurality of core plates consisting of cylindrical arcs of an extended core element and individual core plates movable in the radial direction. It is composed. In such a coil coil reel, the core plates may be moved by a link mechanism or air pressure.

In addition, in the cord coil reel installed in a preferred packaging machine, the core elements may comprise a plurality of core pieces facing each other and consisting of a truncated cone. The core elements in this arrangement can be contracted in the radial direction when the extremes of each core portion are close to the other, while expanding in the radial direction when the extremes of each core portion are separated farther from the other.

The packaging machine of the present invention is advantageously provided with a string coil reel as described above. The string coil reel winds the wrapping string to moderate tensions, thereby preventing the string from being pulled into the string coil. Thus, the string coils loaded therein do not deform or loosen in cross section in the cylindrical inner surface. In addition, designed to shrink / enlarge in the radial direction (ie, the diameter of the core element can be reduced or increased), the string coil reel allows the deformed core to be loaded with other string coils, while It can effectively prevent its loosening from above the inner surface. Specifically, when the core element is contracted in the radial direction, it can be inserted into the deformed hollow of the string coil. Thereafter, the core element expands in the radial direction and is pressed against the cylindrical inner surface of the string coil.

1 is a perspective view showing the appearance of the wrapping string coil of the present invention.

Figure 2 (a) is a cross section of the main part of the wrapping string coil; And (b) is a cross section of the main part of another wrapping string coil.

Figure 3 (a) is a side view of a perforator for forming a hole in the wrapping string coil of the present invention; 3 (b) is a plan view thereof; 3 (c) is a plan view of the hole formed by the perforator.

Figure 4 (a) is a side view of another perforator for forming a hole in the wrapping string coil of the present invention; 4 (b) is a plan view thereof; 4C is a plan view of the hole formed by the perforator.

Figure 5 (a) is a side view of another perforator for forming a hole in the wrapping string coil of the present invention; 5 (b) is a plan view thereof; And Fig. 5C is a plan view of the hole formed by the perforator.

Figure 6 (a) is a side view of another perforator for forming a hole in the wrapping string coil of the present invention; 6 (b) is a plan view thereof; 6C is a plan view of the hole formed by the perforator.

Figure 7 (a) is a side view of another perforator for forming a hole in the wrapping string coil of the present invention; 7 (b) is a plan view thereof; 7C is a plan view of the hole formed by the perforator.

Figure 8 (a) is a side view of another perforator for forming a hole in the wrapping string coil of the present invention; 8 (b) is a plan view thereof; 8 (c) is a plan view of the hole formed by the perforator.

Figure 9 (a) is a side view of another perforator for forming a hole in the wrapping string coil of the present invention; 9 (b) is a plan view thereof; And Fig. 9C is a plan view of the hole formed by the perforator.

FIG. 10 (a) is an exploded view showing a cylindrical inner surface around a hollow 11b inside any wrapping string coil; 10 (b)-(g) are exploded views respectively showing cylindrical inner surfaces around the hollow 11b inside the wrapping string coil 11 of the present invention.

11 (a)-(e) relate to a comparative example.

FIG. 11 (a) is an exploded view showing a cylindrical inner surface around any hollow inside a conventional paper-core string coil, with a moved tubular paper core; FIG. And Figures 11 (b)-(e) are exploded views, respectively, showing the cylindrical inner surface around any hollow perimeter inside a conventional coilless string coil.

FIG. 12 is a table showing a test according to an embodiment of the present invention, a test related to the related art described in FIG. 10, and a test result to the comparative example described in FIG.

FIG. 13 shows various forms of bonding of the ends of the thermoplastic resin string as well as the peeling strength measured in the bonding region, each of which varies depending on the position and the number of holes.

FIG. 14 is a graph showing the relationship between the diameter of the hole and the separation strength in the melt-bonded region in the wrapping string coil 11 of the present invention.

FIG. 15 is a graph showing the relationship between the widthwise tensile strength of the packaging string 11a of the present invention and the separation strength of the melt-bonded region in the packaging string coil 11.

16 (a)-(f) illustrate a series of manufacturing steps of the string coil 11 in one embodiment of the present invention.

17 (a)-(g) illustrate a series of manufacturing steps of the string coil 11 in yet another embodiment of the present invention.

18 (a)-(g) illustrate a series of manufacturing steps of the string coil 11 in yet another embodiment of the present invention.

19 is a perspective view of a part of the exterior of the wrapping coil of the present invention is separated.

20 is a cross-sectional view of the main part of the string coil.

Fig. 21 is a schematic view of the device for manufacturing the string coil.

Figures 22 (a)-(e) illustrate a series of steps for producing any string coils using the apparatus.

Figure 23 (a) is a cross section of another apparatus for manufacturing the string coil of the present invention; And Fig. 23 (b) explains its operation.

24 is a perspective view of another packaging string coil appearance of the present invention.

FIG. 25 is a conceptual view of any device for producing the string coil. FIG.

It is sectional drawing of the principal part of the said string coil.

27 is a perspective view of another packaging string coil appearance of the present invention.

Fig. 28 is a sectional view of the main part of the string coil.

29 is a perspective view of another packaging string coil appearance of the present invention.

30 is a cross-sectional view of the main part of the string coil.

Fig. 31 is a perspective view partially showing the appearance of the wrapping coil coil device of the present invention.

FIG. 32 is an exploded view of the string coil device by perspective view. FIG.

33 is a plan view of a pad used in the string coil device.

34 is a perspective view showing a manufacturing step of the string coil device using a pad.

35 is a plan view of another pad used in the string coil device.

36 (a) and (b) are front views of yet another string coil device of the present invention, wherein the embodiment of FIG. 36 (a) shows a longer shape retention plate than the inner arc of the string coil. 36, the embodiment of Figure 36 (b) uses a frame holding plate shorter than the inner arc of the string coil.

37 is a front view of the frame holding plate used in the string coil device.

Fig. 38 (a) is a perspective view of another frame holding plate used in the string coil device; 38 (b) is its cross section in practical use.

Fig. 39 is a schematic diagram for illustrating the operation of any automatic packaging machine of the present invention.

40 (a) and (b) are model views showing two modes in which an arbitrary coil coil reel is installed on the packaging machine of the present invention.

Figure 41 is a cross-section of any string coil reel for adjusting the string coil device of the present invention.

Fig. 42 (a) is a cross section of the string coil reel, including the string coil and the lid moved; And (b) is a side view thereof wound in the direction of arrow A in FIG. 42 (a).

Fig. 43 (a) is a cross section showing the operation of the string coil reel; 43 (b) is a side view thereof wound in the direction of arrow A in FIG. 43 (a).

44 (a) is a side view of the string coil take-up cover; 44 (b) is a front view thereof wound in the direction of an arrow A in FIG. 44 (a).

45 (a) and 45 (b) are cross-sectional views illustrating a process of loading the string coil on the string coil reel.

46 (a) and 46 (b) are front views showing arbitrary string coils reformed through a loading process.

Fig. 47 is a side view of another string coil reel for adjusting the string coil apparatus of the present invention.

Figure 48 (a) is a side view of the string coil reel for adjusting the string coil device, with the string coil and the lid moved; And FIG. 48 (b) is a front view thereof wound in the direction of arrow A in FIG. 48 (a).

Fig. 49 (a) is a side view of the string coil reel partially detached to show the operation of the string coil reel, with the string coil and the lid moved; FIG. 49 (b) is a front view wound in the direction of an arrow A in FIG. 49 (a).

50 (a) is a side view of the string coil take-up cover; And (b) is a front view thereof wound in the direction of arrow A in FIG. 50 (a).

51 (a) and (b) are side views illustrating a process of loading the string coil on the coil coil bobbin.

Figure 52 (a) is a cross section of another string coil reel for adjusting the string coil device of the present invention; And (b) is a front view thereof.

Fig. 53 is a schematic view of another string coil reel for adjusting the string coil device of the present invention, built on an automatic packaging machine.

54 (a)-(g) illustrate a process of loading or unloading the string coil with respect to the string coil bobbin for the string coil apparatus, wherein FIGS. 54 (a) and ( b) is a cross-sectional and front view showing the first step, respectively; 54 (c) and 54 (d) are cross-sectional and front views, respectively, showing the steps taken; 54 (e) and (f) are cross-sectional and front views, respectively, showing further steps; And Figures 54 (g) and (h) are cross-sectional and front views, respectively, showing further advanced steps.

55 is a perspective view of conventional string coil storage.

56 is a perspective view of a conventional string coil device.

57 is a perspective view of a conventional string coil.

58 is a perspective view illustrating a step of winding the end of the string according to the method of manufacturing the string coil of FIG. 57.

Embodiments of the present invention will now be described with reference to the drawings.

1. Packing string coil and its manufacturing method

1 is a perspective view of an outer appearance of a packing string coil of the present invention.

The string coil 11 consists of a plurality of layers of packaging string 11a wound spirally around a hollow 11b defined on its axis. The string 11a is made of thermoplastic olefin synthetic resins comprising polypropylene, polyamides and polyethylene terephthalaat, which are pulled about five to ten times in the longitudinal direction to remarkably enhance their tensile strength.

The strap 11a has a width of about 10-20 mm and a thickness of about 0.3-1 mm. The string 11a may be made of any thermoplastic synthetic resin whose tensile strength is improved by pulling / stretching. Any string 11a of about 1,000 to 2,500 m in length has an axial length of about 100 to 250 m, an inner diameter of about 200 to 410 mm (as the diameter of the hollow 11b defined on its axis), about 300 to 650 Spirally wound to provide any string coil 11 having an outer diameter of mm and a weight of about 10-25 kg.

The innermost end of the string 11a is located in the middle of the axial length of the hollow 11b.

2 (a) is a cross section of the string 11a, showing part of the periphery of the hollow 11b in the string 11. The hole 11d penetrates through the multiple layers of the string 11a stacked on the top surface of the innermost end, and is drilled to the innermost end of the string 11a around the hollow 11b. Thus, the laminated layers of the string 11a are joined together in the melt-bonding region 11e formed along the periphery of the hole 11d.

The hole 11d and the melt-bonding region 11e penetrate the laminated layer of the string 11a having a perforator heated from the side of the hollow 11b or the stacked top surface of the string 11a. Or by firing a laser beam.

In fact, the only condition for the hole 11d is that at least one of the innermost end of the string 11a and the stacked layer of the string 11a are joined so that the layers stacked in the melt-bonded region 11e are joined together. Is to drill through it. Thus, as shown in Fig. 2 (a), the holes 11d can be drilled through the entire thickness of the two layers stacked on the innermost end of the string 11a. In addition, as shown in Fig. 2 (b), the hole 11b will end in the middle of the second layer laminated on the innermost end of the string 11a.

The hole 11d is supplied using the puncturing machine 38. A circular cross-section pin-shaped drill 38 with sharp points is placed vertically on the holder 39 (Fig. 3 (a)) and heated above the melting point of the string 11a (Fig. 3 (b)). The perforator 38 is inserted from the inside of the hollow 11b to the widthwise center of the innermost end of the string 11a, thereby forming a hole 11d in the widthwise center of the string 11a. 3 (c))

Applying the heated perforator 38 to the innermost end of the string 11a and the layer (s) stacked thereon, the periphery of the perforator 38 is melt-bonded to join the laminated layers of the string 11a. Melt to provide a bonded region 11e. The innermost end and the overlapping layer (s) of the string 11a are joined by a melt-bonded region 11e along the periphery of the aperture 11d, and the ring-shaped melt-bonded region 11e is coiled. It serves as a core for winding the string 11a in forming the core. Because of this coupling, the innermost end of the string 11a is not pulled or released.

As the perforator 38, a circular cross-section pin-type perforator having a hemispherical (round) portion that is fitted vertically to the holder 39 (Fig. 4 (b)) is used (Fig. 4 (a)). ) Is likewise heated above the melting point of the string 11a and inserted from the inside of the hollow 11b into the widthwise center of the innermost end of the string 11a, from which the hole 11d is located in the widthwise center of the string 11a. (Fig. 4 (c))

The cross section of the perforator 38 is not limited to the circular cross section as described above. 5-9 illustrate a planar perforator 38 having elongated holes. The flat perforator 38 of FIGS. 5 (a) and 5 (b) has an elliptical cross section and consists of rounded sides in the thickness direction. This perforator 38 is used at the center of the width direction of the innermost end of the string 11a with the thickness direction of the perforator 38 which is in line with the width direction of the string 11a. As shown in Fig. 5 (c), the hole 11d thus formed has an elliptical cross section extending along the longitudinal direction of the string 11a and having two round ends.

The planar perforator 38 of FIGS. 6 (a) and 6 (b) has a triangular cross section and a thickness gradually decreasing from one side to the other. This perforator 38 provides a hole 11d of triangular cross-section along the length of the string 11a. (Fig. 6 (c)) The flat perforator 38 of Figs. 7 (a) and (b) is square. It has a cross section consisting of one part with the end and the other side with the triangular end. The resulting hole 11d extends along the length of the string 11a so that one end is triangular in shape (Fig. 7 (c)).

8 (a) and 8 (b), the plate-type perforator 38 is composed of rounded sides in the thickness direction as well as a head having a perforated edge. This perforator 38 can easily form an elliptical cross-section hole 11d having a rounded end along the length of the string 11a (Fig. 8 (c)). The planar perforator of FIGS. 9 (a) and 9 (b) has a rectangular cross section and consists of a perforated head inclined from one side to the other. The resulting hole 11d has a rectangular cross section enlarged along the length of the string 11a (Fig. 9 (c)).

The perforator 38 for forming the hole 11d is made of a material of high thermal conductivity (for example, plate-shaped copper of the preceding form). Because of its high thermal conductivity, the entire portion of the perforator 38 is heated quickly and uniformly at the set temperature. As a result, the region 11e which is melt-bonded with the holes 11d is formed efficiently within a short time.

10 (a) is a development view of the cylindrical inner surface of the string coil 11 around the hollow 11b. The innermost end of the string 11a is located in the middle of the axial length of the hollow 11b. At the innermost end of the string, one hole 11d is formed in the widthwise center of the string 11a, and the innermost end of the string 11a and the layers laminated thereon are mutually adjacent in the melt-bonding region 11e. Combined. On the other hand, in the string coil 11 of the present invention, the plurality of holes 11d are string coils 11 around the hollow 11b, with the melt-bonding regions 11e formed along their periphery. Is formed on the cylindrical inner surface. This structure prevents the spiral 11a wound around the hollow 11b from loosening or collapsing.

By way of explanation, the string coil 11 of FIG. 10 (b) has three holes 11d, one formed at the innermost end of the string and the other in the rim row along the axial end of the hollow 11b. It includes one. Each hole 11d is in line with others in the axial direction of the hollow 11b. The melt-bonding region 11e is formed along the periphery of the hole 11d.

The string coil 11 of FIG. 10 (c) includes five holes 11d, one formed at the innermost end of the string and others formed in pairs in the rim row along the axial end of the hollow 11b. The hole 11d in the rim row is off the arc from the hole 11d at the innermost string end. The melt-bonding region 11e is likewise formed along the periphery of the hole 11d. In addition, FIG. 10 (d) shows the combination of the structures of FIGS. 10 (b) and (c).

In addition, the string coil 11 of FIG. 10 (e) includes a plurality of holes 11d lying at regular intervals on an arc in the rim line along the axial end of the hollow 11b. The string coil 11 of FIG. 10 (f) provides a plurality of (for example three) holes 11d in all axially adjacent rows of the string 11a around the hollow 11b, each of which is hollow ( Parallel to others in the axial direction of 11b). In addition, the string coil 11 of FIG. 10 (g) has a hole (between the axially parallel holes 11d of FIG. 10 (f) in the center line and the rim direction line in the axial direction of the hollow 11b. 11d).

In order to form the desired separation strength (melt-bond strength) and widthwise tensile strength in the melt-bonded region 11e where a bond is formed between the laminated layers of the string 11a, the holes 11d are formed by the string 11a. It is set from the viewpoint of arrangement, dimension, number, position, etc., depending on the raw material, thickness, width, and the like. Based on the other form of the hole (s) 11d and the melt-bonded region (s) 11e, the string coil 11 of FIGS. 10 (a)-(g) is a conventional string coil reel of an automatic packaging machine. Automatic packaging machines loaded with vibration resistance, transport resistance, load ability, and string coil reel (machine-packageability test) The packaging capacity of the drum-set test was tested. The test results are edited in FIG. 12, where there are Examples 1-7 corresponding to the string coils 11 of FIGS. 10 (a)-(g), respectively. Comparative examples were carried out using the wrapping string coils 211 of FIGS. 11 (a)-(e), each of which is a developed view of a cylindrical inner surface around the hollow 11b.

The string coils described in FIGS. 10 and 11 were made of polypropylene strings.

In the comparative example, when the string end 200 is securely or insecurely placed in various ways, it is noted that the innermost end 200 of the string of all string coils 211 is located in the middle of its axial length. It must be understood. In Comparative Example 1, the innermost end 200 of the string was fixed on a tubular paper core (not shown) using a stapler 201 (staple width 10 mm) (FIG. 11 (a)). In Comparative Examples 2 to 5, a string coil 211 without a core was used. In Comparative Example 2 (FIG. 11 (b)), the innermost end 200 of the string was placed unsafely. In Comparative Example 3 (FIG. 11 (c)), the innermost end 200 of the string lies insecurely, but before winding into any string coil for 10 minutes at 80 ° C. to prevent its shrinkage and deformation, It was annealed. In Comparative Example 4 (FIG. 11 (d)), the innermost end 200 of the string is securely laid together with the string adjacent to the string coil 211 by kraft tape 202. In Comparative Example 5 (Fig. 11 (e)), the innermost end 200 of the string is securely laid together with all the widthwise strings of the string coil 211 by kraft tape 202.

[Test Procedure]

Vibration test

Each string coil sample was placed horizontally with a 250-mm-diameter cylinder on the diaphragm. The diaphragm vibrates at 100 times / min vertically in the 15 mm range. The slope change is based on the following criteria. Inclined samples did not loosen or collapse the cylindrical inner surface after 1 hour of vibration; Inclined samples Δ loosened the cylindrical inner surface after vibration for 30 minutes to 1 hour; Inclined samples x loosened the cylindrical inner surface in a vibration within 30 minutes.

Transportation test

Each sample is packed in a corrugated cardboard box (length × width × depth: 465 × 465 × 210 (mm)) and transported by truck over a distance of 500 km. Five samples are used in this test. As a result of FIG. 12, a plurality of samples do not appear to loosen or disintegrate during transport.

Drum-set test

The drum-set test was a test of the control characteristics of the string coils during the loading operation on the drum of the automatic packaging machine. Automatic packaging machines used are: NAIGAI F11 (hereinafter referred to as "Machine A"), NICHIRO SX-500 ("Machine B") and STRAPACK RQ-8 ("Machine C"). Two samples were used in this test. The results of FIG. 12 show that the inner surfaces of the multiple samples do not loosen or collapse before finishing loading.

Machine-packageabilty test

The machine-packing capability test tested the incidence of problems, such as tape-broking, during normal packaging operations in conventional-feed rollers or the like. For machines A, B and C, two samples each were used in each test. The results in FIG. 12 represent a number of samples in which any such problem occurs.

From Fig. 12, the string coil 11 of the present invention, as described in Figs. 10 (b)-(g), gave surprising results. None of them loosened the cylindrical inner surface. In addition, when using automatic packaging machines, they did not cause any problems such as breaking. In addition, the separation strength of the thermoplastic string ends was measured using test pieces 311 as shown in FIGS. 13 (a)-(f) made of polypropylene strings. The test piece 311 had a string end securely laid in other ways, for example, by varying the location or number of hole (s). The polypropylene cord used in the above test, such as the vibration test, was wound around a 200 mm-diameter core, where the end of the cord was the innermost part of the cord, according to the shape shown in FIGS. 13 (a)-(e) Melt-bonded by hole (s) 11d within 20 mm from the rim. In comparison, the string end of the test piece 311 shown in FIG. 13 (f) was fixed to the paper core 312 using a stapler 313. The test piece 311 was pulled downward at a rate of 50 mm / min until the joined area was separated. The measured values are shown in the right row of FIG. 13.

In terms of appearance, the hole 11d has a moderately small circular cross section and does not protrude from the string 11a. Thus, the terminated string coil looks almost like a conventional coreless string coil.

In the circular cross-section hole 11d shown in FIGS. 3 and 4, the separation strength in the melt-bonding region 11e depends on the arc length of the hole 11d and is set according to the raw material and the thickness of the string 11a. . Thus, the required separation strength can be obtained simply by calculating the diameter of the hole 11d from its set arc length and then forming a hole 11d of that diameter, along the outer periphery of the required melt-bonded region. To provide.

14 is a graph showing the relationship between the diameter of the hole 11d and the separation strength in the melt-bonding region 11e. The string coil used here was formed by spirally winding a polypropylene string 11a having a thickness of 0.65 mm and a width of 15.5 mm. In such a string coil, the circular cross-section hole 11d and the melt-bonding region 11e open the hole with the pin-type puncher 38 of FIGS. 3 (a) and (b) preheated above the melting temperature of the string 11a. It formed through a hole. The separation strength in the melt-bonding zone 11e was measured at a stretching rate of 200 mm / min.

As shown in FIG. 14, the 0.4-mm-diameter hole 11d shows a separation strength P ₁ of about 300 gf in the melt-bonding region 11e. The 0.6 mm-diameter hole (11d) showed a separation strength of about 380 gf. In this case, the combined layers of the string 11a were separated smoothly and did not peel off in the longitudinal direction. In addition, the separation strength in the melt-bonding region 11e can be increased by increasing the diameter of the hole 11d. The 0.8 mm-diameter hole (11d) showed a separation strength of about 550 gf (P ₃ ), and the 1.0-mm-diameter hole (11d) showed a separation strength of about 700 gf (P ₄ ). In this case, however, the combined layers cannot be separated from each other and one of the layers is peeled off in the direction from each other.

In the thermoplastic synthetic resin strap 11a (for example, made of polypropylene), the thinner strap 11a is more vulnerable to longitudinal tear. Thus, in proportion to the thickness reduction of the string 11a, the diameter of the hole 11d must be reduced to reduce the separation strength in the melt-bonding region 11e. Thereby, the thinner string of bonding layers can be safely separated from each other in the melt-bonding region 11e without peeling in the longitudinal direction. According to Fig. 14, when the diameter of the hole 11d is 0.6 mm or smaller, the 0.65-mm-thick polypropylene string 11a maintains a separation strength of 400 gf or becomes smaller in the melt-bonding region 11e. . In order to maintain the same separation strength, the 0.5-mm-thick PET (polyethylene terephthalate) string 11a should have a hole 11d of 1.2 mm or smaller diameter.

As described above, the diameter of the hole 11d is reduced so that the melt-bonded region 11e formed along its outer circumference becomes smaller and exhibits lower separation strength. In such a situation, the desired separation strength can be obtained by forming a plurality of holes 11d which, as a whole, provide the separation strength in the melt-bonding region 11e.

Although the above is focused on the circular cross-section hole 11d, the hole 11d shown in Figs. 5 to 9 shows the desired separation strength in the melt-bonding region 11e and the tensile strength in the width direction of the string 11a. Can be obtained, and the combined layers of the string 11a are safely separated but not peeled off. According to the same theory, the circumferential length, arrangement, number, position, etc. of the holes 11d are designed in view of the raw material, thickness, and width of the string 11a.

The holes 11d in Figs. 5 to 9 have cross sections extending in one direction as described above. In order to prevent the string 11a from peeling off, the longitudinal direction of the hole 11d should be parallel to the longitudinal direction of the string 11a.

FIG. 15 is a graph showing the relationship between the tensile strength in the width direction of the string 11a and the separation strength in the melt-bonding region 11e, for the holes 11d of the circular end and those of the rectangular cross section. The value of the circular section hole 11d is indicated by A ₁ (diameter: 0.55 mm) and A ₂ (diameter: 1.00 mm). The values of the rectangular cross-sectional holes 11d are indicated by B ₁ (0.55 × 5 mm) and B ₂ (0.55 × 8 mm). The rectangular cross-section hole 11d has a longitudinal side surface parallel to the longitudinal direction of the string 11a.

In the circular cross-section hole 11d, the enlargement of the diameter is a result of not only the widthwise tensile strength of the string 11a but also the separation strength in the melt-bonding region 11e. In contrast, in the rectangular cross-section hole 11d, the extension of the longitudinal sides has little influence on the separation strength in the melt-bonding region 11e (usually the value is kept at about 400 gf). On the other hand, the tensile strength in the width direction of the string 11a increases in proportion to the increase in the longitudinal length.

And, the 0.65-mm-thick polypropylene string 11a is desirable when it has a separation strength of 400 gf or less in the melt-bonding region and when it has a tensile strength in the width direction of the string 11a of about 2,000 gf. Do. In the case of the rectangular cross-section hole 11d, these values are appropriately obtained by adjusting the length of its longitudinal sides. Proper combination of separation strength and widthwise tensile strength not only ensures safe separation and anti-separation between the bonded layers of the string 11a, but also prevents unwanted loosening of the string coil 11. In addition, in the rectangular cross-section hole 11d, the widthwise tensile strength of the string 11a can be increased by extending the longitudinal length instead of adding more holes.

In addition, the string coil 11 of the present invention may include a hole 11d in its cylindrical outer surface. A hole 11d is drilled around the outermost end past the underlying layers of the string 11a, whereby the bonding of these layers in the melt-bonding region 11e is formed along its periphery. This arrangement prevents the outermost end of the string from being unnecessarily pulled out. Thus, the process of safely placing conventional string ends, such as taping or individual hot melts, is no longer necessary.

16 (a)-(f) are a series of configuration diagrams showing the manufacturing steps of the string coil 11. These steps are performed, for example, using the winding roller 31 shown in Fig. 16A. The winding roller 31 has a cylindrical hollow made up of four identical cylinder frames 31a obtained by dividing a cylinder of suitable axial length into quarters on an arc. Each cylinder frame 31a is placed along one circumference with a circumferential gap 31c to form a cylinder of circular cross section. Four cylinder frames 31a arranged along one arc can contact the diameter of the circular cross-section cylinder, which slides toward the axis of the cylinder. On the other hand, the contacted cylinder slides the outer cylinder frame 31a and expands in the radial direction. The gap 31d is formed before the middle of each cylinder frame 31a.

The winding roller 31 adjusts four holders 39, each of which is in front of the cylinder frame 31a and supports the circular cross-section perforator 38 there. Similar to the cylinder frame 31a, the four holders 39 lie along one circumference with a gap on the circumference to form a curved arrangement and constitute a cylinder of circular cross section. The holder 39 can also slide in the radial direction. The perforator 38 stands on the outer surface of each holder 39 in such a way that it can be designed radially along the gap 31d formed in the cylinder frame 31a. Although not shown in the figure, a heater is placed inside each holder 39 for the purpose of heating the perforator 38, and the outer surface of the holder 39 is covered with a thermal insulating material.

In order to wind the string 11a on the winding roller 31, the fixing device 33 is provided at the beginning of the string 11a (i.e., the innermost end of the string coil 11) guided by the string guide 34. Attached. Then, as shown in Fig. 16 (b), the cylinder frame 31a slides outward along one arc to form a circular cross section cylinder. Inside the winding roller 31, the holder 39 maintains an appropriately laid relationship with respect to the cylinder frame 31a, and holds the perforator 38 away from the cylinder 31a. A fixture 33 attached to the beginning of the string 11a is fitted in a gap 31c formed between the periphery of the pair of cylinder frames 31a, so that the middle of the axial length of the winding roller 31 is Securely place the beginning of the string 11a on With the arrangements thus constructed, the winding roller 31 starts to rotate in the direction of the arrow T in Fig. 16 (b) and winds the string 11a thereon.

After the string 11a forms a plurality of layers around the core of the axial length of the winding roller 31 (Fig. 16 (c)), the winding roller 31 has a gap 31 in the cylinder frame 31a. It stops at such a point that it is located facing the designed drill 38 from the holder 39.

In the next step shown in FIG. 16 (b), the holder 39 holding the heated perforator 38 slides in the anti-now direction toward the cylinder frame 31a. The perforator 38 is preheated above the melting point of the thermoplastic synthetic resin constituting the string 11a. For example, in the polypropylene string 11a, the perforator 38 is heated at about 200 ° C., which is higher than the melting point of polypropylene. With the outward movement of the holder 39, the perforator 38 advances past the gap 31d of the cylinder frame 31a and onto a plurality of laminated layers of the strap 11a wound on the winding roller 31. Attach. As a result, four holes 11d (FIG. 2) spaced at equal intervals on the arc are simultaneously formed in the laminated string 11a layers and remain around them in the molten state.

Next, as shown in Fig. 16E, the holder 39 slides away from the cylinder frame 31a, drawing the perforator 38 out of the gap 31d. Following the withdrawal of the perforator 38, the molten region along the outer periphery of the hole 11d hardens to form the melt-bonding region 11e (FIG. 2) and joins the layers of the laminated string 11a. . From there, the winding roller 31 is rotated until the predetermined length of the string 11a is wound thereon. While the strap 11a is wound, the strap 11a axially reciprocates along the winding roller 31, with the result that the strap 11a is helical on the cylindrical surface of the winding roller 31 at its set axial length. Wound

After the predetermined length of the string 11a is wound on the winding roller 31, the diameter of the winding roller 31 is reduced by sliding the cylinder frame 31a toward its axis (Fig. 16 (f)). The winding roller 31 contracted in the radial direction is moved from the axis of the spirally wound string 11a. Thus, the coreless string coil 11 whose shaft is defined by the hollow 11b is obtained.

In forming the holes 11d in the layers of the laminated string 11a, the arrangement, number, position, etc. of the perforator are separated from the melt-bonding region 11e (or the tensile strength in the width direction of the string 11a). And appropriately adjusted to balance the bond strength. Thus, one or more perforators 38 of FIGS. 5-9 can be used.

As an additional embodiment, the holder 39 supporting the perforator 38 is rotated at the same time as the winding roller 31, thus eliminating the step of paralleling the holder 39 and the cylinder frame 31a. This arrangement enhances the operating efficiency since the holes 11d are formed while the winding roller 31 is rotating.

The perforator 38 for forming the hole 11d is the bottom surface of the innermost strap 11a, as described in Figs. 16 (a)-(f) (ie from the plane of the winding roller 31 axis), or It may also be applied to the top surface of the layered string 11a as described in Figures 17 (a)-(g).

The manufacturing steps shown in Figs. 17A to 17G are carried out using a winding roller 31 including four cylinder frames 31a, as shown in Fig. 17A. The cylinder frame 31a can slide outward along one arc to form the winding roller 31 of the circular section 31 (FIG. 17 (b)). In the winding roller 31 enlarged in the radial direction, the beginning of the string 11a guided by the string guide 34 is attached to the beginning of the string into a gap 31c between the periphery of the cylinder frame 31a. By inserting the fixing device 33, it is fixed to the center of the axial length of the winding roller 31. As shown in FIG.

The perforator 38, in the vicinity of the winding roller 31 by means of a suitable holder, may be advanced or retracted in the radial direction of the winding roller 31. After the beginning of the string 11a is fixed to the cylindrical outer surface of the winding roller 31, the winding roller 31 is until the string 11a makes a plurality of layers around the center of the axial length of the winding roller 31. It will rotate in the direction of the arrow (T). At that time, the winding roller 31 is stopped at the position shown in Fig. 17B. The perforator 38, heated by the heater at a predetermined temperature, is permitted to access the winding roller 31 from its outer side and drills the laminated layers past the beginning of the string 11a. As a result, a hole 11d is formed in the laminated strings 11a layers and remains around it in the molten state.

Then, the perforator 38 becomes a winding roller 31 and is withdrawn from the layers of the string 11a, from which the region melted around the hole 11d is hardened into the melt-bonding region 11e. After the formation of the first hole 11d, the winding roller 31 is turned 1/4 turn (i.e., rotated 90 degrees) in the direction of the arrow T (Fig. 17 (c)) and stops again. The perforator 38 approaches the winding roller 31 and drills another hole 11d in the layers of the stacked string 11a, and the perforator 38 then retreats in the opposite direction and from the string 11a. Withdrawn.

The formation of the holes 11d is stacked to rotate the winding roller 31 at 90 degrees (i.e. quarter turn) and to form the holes 11d, as shown in FIGS. 17 (d) and (e). In accordance with the bonding cycle consisting of the steps of perforating the layers of string 11a with the perforator 38 (FIG. 2) and withdrawing the perforator 38 from the string 11a to solidify the melt-bonded region 11e. do. As a result, four equally spaced holes 11d and melt-bonding regions 11e are formed on the arc.

After four holes 11d and the melt-bonding region 11e are formed, the winding roller 31 is continuously rotated to wind a predetermined length of the string 11a into the coil (Fig. 17 (f)). When the winding roller 31 stops rotating, the winding roller 31 slides in the cylinder frame 31a toward the axis of the winding roller 31 and is withdrawn in the radial direction (Fig. 17 (g)).

. The withdrawn winding roller 31 is moved from the axis of the spirally wound string 11a. Thus, a coreless string coil 11 having an axis defined by the hollow 11b is obtained.

Instead of the heated perforator 38, a laser beam may be used for the formation of the hole 11d and the melt-bonding region 11e, as described in Figs. 18 (a)-(g). As in this embodiment, a winding roller 31 including four cylinder frames 31a is used. Each cylinder frame 31a is operated to slide in the radial direction by the air cylinder 36 adjusted in the winding roller 31. While the winding roller 31 is pulled out in the radial direction by sliding the cylinder frame 31a toward the axis of the winding roller 31, the fixing device 33 of the string 11a guided by the string guide 34. Attached to the beginning. Then, as shown in Fig. 18 (b), the cylinder frame 31a is moved outward along one arc by the air cylinder 36 to constitute a circular cross-section winding roller 31 having an expanded diameter. do. The fixing device 33 is fitted into a gap 31c formed between the periphery of the cylinder frame 31a to fix the start of the string 11a in the middle of the axial length of the winding roller 31.

As mentioned in Fig. 18 (c), the laser oscillation device 35 is arranged around the winding roller 31, which is directed in the radial direction of the laser beam thereof along the radial direction of the winding roller 31. In addition, the laser oscillation device 35 may advance or retreat with respect to the winding roller 31. The winding roller 31, which securely holds the beginning of the string 11a on the cylindrical outer surface of the winding roller 31, has an arrow T until the string 11a rotates about three times around the center of its axial length. It will rotate in the direction of. After the winding roller 31 stops rotating, the laser oscillator 35 approaches the winding roller 31 and fires a laser beam over the laminated layers past the innermost end of the string 11a. The laser beam melts a portion of the stacked innermost ends of the string 11a to provide the holes 11d and the melt-bonding region 11e. The stacked layers are thus bonded together in the melt-bonding region 11e (FIG. 2) along the periphery of the hole 11d (FIG. 2).

After the formation of the first hole 11d, a quarter turn (that is, 90 ° rotation) is made in the direction of the arrow T (Fig. 18 (d)), and the process is stopped again. At this point, the laser oscillator 35 emits a laser beam over the layers of string 11a laminated to form another hole 11d and a melt-bonding region 11e around it.

The formation of the hole 11d is wound 90 degrees (ie 1/4 turn) to form the hole 11d and the melt-bonding memory 11e along its periphery past the layers of laminated string 11a. The rotation is repeated according to the bonding cycle consisting of the rotation of the roller 31 and the step of radiating the laser beam by the laser oscillation device 35. As a result, all four holes 11d and the melt-bonding regions 11e are placed at regular intervals on the arc.

Thereafter, the laser oscillation device 35 is retracted from the winding roller 31 (Fig. 18 (e)), and the winding roller 31 is continuously rotated to wind the string 11a of a predetermined length into the coil ( 18 (f)). After the winding roller 31 stops rotating, the winding roller 31 slides in the cylinder frame 31a toward its axis and is pulled out in the radial direction (Fig. 18 (g)). The withdrawn winding roller 31 is moved from the axis of the spirally wound string 11a. Thus, a coreless string coil 11 having an axis defined by the hollow 11b is obtained.

As described above, the laser beam emitted from the laser oscillation device 35 can form the smaller holes 11d in a more stable and efficient manner. In addition, the laser oscillator 35 includes a smaller expandable portion and is therefore easier to maintain.

The laser oscillation device 35 rosseoneun, CO ₂ laser oscillator which is CO ₂ gas as a laser medium used device is used. The CO ₂ laser oscillator is driven by a current of 6 A and emits a laser beam of 27 W output power at a wavelength of 10.5-10.7 μm. The firing time of the laser beam is in the range of about 0.1-5 seconds, more suitably about 0.5 seconds, at a time when the laser firing hardly affects the winding rate of the string 11a.

In addition to the CO ₂ laser oscillator, examples of the laser oscillator 35 include a helium-neon laser oscillator, a semiconductor laser oscillator, and the like.

19 is a partially broken perspective view showing another embodiment of the wrapping string coil of the present invention. On the cylindrical innermost surface of the string coil 11, the string 11a is spirally wound around the hollow 11b from the end of one axis to the end of the other axis. Another layer of the string 11a is then spirally stacked on the top surface on the innermost string layer. In this way, the string 11a is wound spirally and continuously to form the string coil 11.

In the string coil of Fig. 19, on the top surface of the innermost row of the string 11a constituting the cylindrical inner surface of the string coil 11, in which any adhesive 11c is around the hollow 11b, Along the entire axial length of the string coil 11 is applied. 20 shows a partial cross section of the string coil 11 applied with adhesive 11c. The adhesive 11c supplies an adhesive layer to the top surface of the innermost row of the string 11a spirally wound around the hollow 11b to constitute a cylindrical inner surface of the string coil 11, and as long as it is thereon. The top of the pair of stacked string layers is similarly provided. The adhesive 11c combines the laminated layers of the string 11a with pressure sensitivity and with appropriate adhesion strength.

Because of the adhesive 11c exhibiting an appropriate adhesive strength, the innermost spiral rows of the string 11a constituting the cylindrical inner surface around the hollow 11b are joined to string layers stacked on its top surface. Thus, the beginning of the string 11a (ie, the innermost end of the string coil 11) is not loosened in the hollow 11b. In addition, the innermost helical rows of the string 11a are glued to the entirety of the various layers stacked on its top surface. As a result, the string coil 11 will not loosen around the hollow 11b.

When using a wrapping machine for automatically grasping corrugated cardboard boxes or such items, the adhesively bonded string coil 11 is loaded onto any string coil bobbin installed on an automatic packaging machine. In operation, the outermost string end on the cylindrical outer surface of the string coil 11 is pulled by a conveying roller of an automatic packaging machine. Since the top surface of the innermost strap layer around the hauler 11b is adhesively bonded to the layers laminated with a constant adhesive strength, the adhesively bonded portion does not detach and peel off safely while the strap 11a is pulled out. .

As described above, located on the cylindrical inner surface around the hollow 11b defined on the axis of the string coil 11, the innermost end of the string 11a is too easily separated from the string layers laminated on its top surface. Should not be. However, on the other hand, it must be separated from the part joined with the appropriate tensile strength. As long as these conditions are satisfied, the kind of adhesive 11c is not strictly limited. For example, preferred adhesives, both solvent and non-solvent, include heat-melt adhesives and liquid-solidfied adhesives.

Solvent type adhesives include natural rubbers, rubber-based adhesives such as styrene-butadiene rubber, polyisobutylene rubber and isoprene rubber, acrylic adhesives such as copolymers containing 2-ethylhexyl acrylic as the main monomer, and the main components. And silicone-based adhesives composed of siloxanes such as rubbers or siloxanes containing resins. As solvents for rubber adhesives, volatile oils for rubber, trichloroethylene, toluene, n-hexane, methyl ethyl ketone and the like are used.

The non-solvent heat-melt adhesive may have a melting point and melt flow rate, such as a copolymer of styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene-butylene-styrene, ethylene-vinyl acetate, and the like. Block polymers with high fluidity are suitably included. Polyethylene waxes and paraffins are also used. Suitably, the melting point of the heat-melt adhesive is lower than the melting point of the string 11a, in particular not higher than 100 ° C. In this respect, any string 11a composed of polypropylene (PP) is suitable for low-molecular-weight polyethylene, EVA, paraffin and the like. Any string 11a composed of polyethylene terephthalaat (PET) advantageously utilizes low-molecular-weight polyethylene, EVA, PP and the like.

As the nonsolvent adhesive, one made of a liquid-coagulant polyester adhesive or an acrylic adhesive is used.

Instead of the solvent-type adhesive 11c, heat-melt and non-solvent, heat-melt synthetic resins are used independently of the adhesive 11c. By way of example, the heat-melt synthetic resin is similar to or the same as the material of the string 11a (eg polypropylene) used in the bed heated above its melting point. When injected between the layers of the string, the molten synthetic resin combines these layers in a separable manner.

The string coil 11 coated with the adhesive is formed using the winding roller 31 and the applicator 20 as shown in FIG. The applicator 20 is composed of a fan 21 filled with an adhesive disposed therein, a conveying roller 22 and an applying roller 23 arranged to be in contact with the top of the conveying roller 22. In the fan 21, the adhesive 11c is held on the surface of the feed roller 22 which rotates in a given direction and is eventually supplied to the surface of the application roller 23.

The winding roller 31 for winding the string 11a is disposed to rotate around the applicator 20. The winding roller 31 has an arbitrary cylindrical hollow including four identical cylinder frames 31a obtained by four equal cylinders on arcs of appropriate axial length. Each cylinder frame 31a lies along one circumference with an arcuate gap 31c to constitute a cylinder of circular cross section. Four cylinder frames 31a arranged along one circumference can contact the diameter of the circular cross section cylinder, and then slide toward the axis of the cylinder. Each cylinder frame 31a includes a plurality of small holes 31b.

An air nozzle assembly 32 is securely arranged inside the winding roller 31. The air nozzle assembly 32 is composed of four nozzles 32a enlarged in the radial direction from the axis of the winding roller 31. Air is discharged from the tips of the nozzles 32a toward the cylindrical surface of the winding roller 31.

The applicator 20 disposed around the winding roller 31 may slide horizontally in the approaching / retracting direction with respect to the winding roller 31. When the applicator 20 approaches the winding roller 31, the application roller 23 is pressed against the cylindrical outer surface of the winding roller 31, generally along its entire axial length.

In order to wind the string 11a on the winding roller 31, the cylinder frame 31a first slides outward along one circumference to form a cylinder of a circular cross section. As shown in Figs. 21 and 22 (a), the beginning of the string 11a (i.e., the innermost end of the string coil 11) is a gap 31c between the periphery of the pair of cylinder frames 31a. It is fixed on the winding roller 31 by a fixing device 33 fitted in. In the meantime, the applicator 20 is separated from the winding roller 31. Under this situation, the winding roller 31 is rotated in the direction of the arrow T shown in Figs. 21 and 22 (a) to wind up the string 11a.

While the string 11a is wound, the string 11a reciprocates on the axis along the winding roller 31, with the result that the string 11a is helically formed on the entire cylindrical surface of the winding roller 31. Are stacked.

After the string 11a is spirally wound on the entire surface of the winding roller 31 to form the innermost layer of the string coil 11, the rotation of the winding roller 31 is temporarily stopped. In the meantime, the applicator 20 approaches the winding roller 31 until the application roller 23 is pressed against the string 11a wound on the winding roller. (Fig. 22 (b) )) When the contact relationship is established, the rotation of the winding roller 31 is resumed so that the string 11a is spirally wound on the winding roller 31.

During the second winding step, the application roller 23 is held against the top surface of the innermost layer of the string wound on the cylindrical entire surface of the winding roller 31, and the winding roller 31 is applied to the application roller ( Induces the rotation of 23, and further causes the rotation of the feed roller (22). Thus, the adhesive 11c contained in the fan 21 is first moved on the surface of the application roller 23 by the surface of the feed roller 22. At the same time, the application roller 23, which is pressed against the top surface of the string 11a wound on the winding roller 31, applies the adhesive 11c thereon. As a result, the adhesive 11c is applied onto the string 11a wound on the cylindrical outer surface of the winding roller 31 along its entire axial length at a generally desired arcuate length.

The winding roller 31 rotates to make more layers under the application of the adhesive 11c. At that time, the rotation of the winding roller 31 is stopped again. At this time, as shown in Figure 22 (c), the applicator 20 is disposed away from the winding roller 31 and between the coating roller 23 and the string 11a wound on the winding roller 31. Break contact. After the application roller 23 is separated therefrom, the winding roller 31 resumes winding the string 11a continuously in a spiral form (Fig. 22 (d)).

During the third winding step, air is discharged from the nozzle 32a of the air nozzle assembly 32 inside the winding roller 31 so as to be sprayed on the circumferential surface of the winding roller 31. Specifically, the air discharged from the nozzle 32a passes through the plurality of small holes 31b in the cylinder frame 31a and reaches the string 11a wound on the winding roller 31. The air spray promotes volatilization of any solvent in the solvent type adhesive 11c applied on the string 11a.

As shown in Fig. 22 (d), the predetermined length of the string 11a is wound on the winding roller 31 below the air spray from the nozzle 32a. The continuous air spray allows the adhesive 11c to develop an adequate adhesive strength before the string 11a is rolled up.

When the string 11a is wound at a predetermined length, the winding roller 31 is retracted in the radial direction by sliding the cylinder frame 31a toward its axis. The retracted winding roller 31 is moved from the string 11a wound by an arbitrary coil, whereby the string coil 11 of the present invention is given as shown in FIG.

In the heat-melt adhesive 11c, the application is performed by the applicator 20 in the same manner as shown in Fig. 22 (b) while the string 11a is wound on the winding roller 31. May be affected. Since the hot-melt adhesive 11c does not require air spray for volatilisation, the winding roller 31 makes the air nozzle assembly 32 unnecessary.

In addition, the heat-melt adhesive 11c may be applied with the use of any cylinder applicator 25 as shown in Fig. 23 (a). The cylinder applicator 25 is plunger adjusted to slide on a cylindrical barrel 25a filled with a heat-melt adhesive 11c and a barrel 25a for pressing the adhesive 11c. ) 25b. One end of the barrel 25a receives the plunger 25b along its axis, and the other end is gradually tapered into a conical shape. In order to heat and melt the heat-melt adhesive 11c, the barrel 25a is covered by a heater 25c.

The cylinder applicator 25 is arranged around the string guide 34 for guiding the string 11a to the winding roller 31. After the string 11a is wound on the entire surface of the winding roller 31 to make the innermost layer of the string coil 11, the cylinder applicator 25 is wound around the winding roller 31. The tapered tip of the barrel 25a is sandwiched between the top surface of 11a and the bottom bottom of the string 11a guided by the string guide 34. In this position, the plunger 25b is pressed into the barrel 25a containing the heat-melt adhesive 11c melted by the heater 25c. The molten adhesive 11c is pressed out of the tip of the barrel 25a in the string 11a wound on the winding roller 31.

As shown in Fig. 23 (b), the barrel 25a is capable of reciprocating in the axial direction of the winding roller 31 to follow the string 11a wound spirally and continuously on the winding roller 31. Can be. Thus, the cylinder applicator 25 continues to be used not only on the top surface of the innermost layer of the string wound on the winding roller 31 but also on the top surface laminated more on the heat-melt adhesive 11c. do.

The solvent type or heat-melt adhesive 11c may be applied only to a portion of the innermost layer of the string constituting the cylindrical inner surface of the string coil 11.

In another arrangement shown in FIG. 24, the solvent- or heat-melt adhesive 11c is applied over several layers of the laminated string 11a along the axial end of the winding roller 31. Not shown.) For example, the adhesive 11c may be any spray gun 27 as shown in FIG. 25 while the string 11a is wound on the winding roller 31. (Not shown) In the spray gun 27, in the solution state, the adhesive 11c is supplied through an adhesive feed hose 27a and compressed air. Is supplied through any air transfer hose 27b. In solution, the adhesive 11c is sprayed from the tapered tip of the spray gun 27 to the side of the innermost layers of the string coil 11.

In another arrangement, the adhesive 11c can be supplied to the top surface of the innermost layer of the string coil 11 as well as on the innermost layers stacked along each axial end of the winding roller 31. It may be. As shown in Fig. 26, when the adhesive 11c efficiently penetrates into the gap between the string layers laminated along the axial end of the winding roller 31, the adhesive 11c also has the winding roller. (31) penetrate into the gap between the adjacent rows of the innermost string layer spirally wound on (31).

When the adhesive 11c is supplied on the layers of the string 11a stacked along the axial end of the winding roller 31, the adhesive 11c instead of covering a part thereof, the laminated string Be sure to cover the entire arc of (11a). For example, as shown in FIG. 27, the adhesive 11c is supplied on each side of the string coil 11 in the formation of a string resulting from three points on an arc, and the string coil 11 Is enlarged along the entire radius length. In this arrangement, all the layers of the string 11a stacked along the axial end of the winding roller 31 are joined together by the adhesive 11c (Fig. 28).

In another arrangement shown in FIG. 29, the heat-melt adhesive 11c is applied in a molten state over the entire cylindrical inner surface of the string coil 11. As illustrated in FIG. 30, the adhesive 11c coagulates to engage with adjacent strings of the spirally wound strap 11a constituting a cylindrical innermost surface.

As a method of applying such an adhesive, the melt-bonded adhesive 11c is applied on the cylindrical outer surface of the winding roller 31. The string 11a is wound on a winding roller coated with the adhesive to form the string coil 11. After the adhesive 11c is cooled and solidified, the winding roller 31 is retracted in the radial direction and moved out of the string coil 11. This arrangement facilitates the application of the adhesive 11c but does not adversely affect the movement of the winding roller 31 from the string coil 11.

It should be noted that in all embodiments of the string coil 11 bonded with the adhesive described above, the string 11a is detachably joined by the adhesives exemplified above.

As shown in FIGS. 31 and 32, the string coil 11 obtained in one of the methods described above may have both sides covered by a pair of pads 12. The resulting string coil device 10 is suitable for transportation and storage.

2. Packing coil device

As shown in FIG. 31 and FIG. 32, the wrapping string coil 10 is prepared by placing a pair of pads 12 on both side surfaces of the end coil 11. The pads 12 made of corrugated cardboard each have a disk shape whose outer diameter is substantially the same as that of the end coil 11. In the center of the pad 12, twelve central flaps are formed, which can be folded into the cylindrical hollow 11b of the string coil 11. The annular area around the central flap 12a forms a ring 12b, which abuts against the side of the string coil 11 and supports each other.

33 is a plan view of the pad 12, illustrating a case where the central flap 12a is extended. The central flap 12a is folded along the circular chain line 12c, and the chain line 12c is formed along the concentric circle of the pad 12, the diameter of which is the hollow 11b defining the axis of the string coil 11. It is about the same diameter. The inner region surrounded by the dashed line 12c is cut along twelve dividing lines, and the twelve dividing lines extend radially from the center of the inner region. Thus, the inner region is divided into twelve parts (i.e., central flap 12a) that are circumferentially identical. The central flap 12a is folded along the dashed line 12c so that it is inserted into the hollow 11b defining the axis of the string coil 11 and is squeezed perpendicularly to the ring 12b surrounding the central flap 12a. Lose. As a result, the pad 12 forms a hole in the center of the pad 12 opened through the hollow 11b.

In order to fix the pad 12 to the string coil 11, an adhesive is formed on the entirety of one surface of the pad 12 facing the side of the string coil 11. The above adhesive detachably couples the pad 12 and the string coil 11, by which the ring 12b of the pad 12 is coupled to the side of the string coil 11, and the central flap 12a. ) Is coupled to the inner cylindrical surface of the string coil 11 surrounding the hollow 11b.

Hereinafter, the manufacturing method of the string coil device 10 will be described in detail. First, the string 11a is wound around the string coil 11. At this time, the pair of pads 12 shown in FIG. 33 are prepared, and an adhesive is applied to the pads 12 with the central flap 12a unfolded with respect to the ring 12b. Then, as shown in FIG. 34, the surface of the adhesive coated ring 12b faces the side of the string coil 11. The ring 12b is compressed toward the side of the string coil 11, so that the ring 12b and the string coil 11 are coupled by the adhesive.

Finally, the central flap 12a in the pad 12 is folded along the dashed line 12c in a direction perpendicular to the ring 12b and inserted into the hollow 11b formed along the axis of the string coil 11. Thereby, the string coil apparatus 10 shown in FIG. 31 is completed.

In the string coil device 10 described above, the pad 12 is bonded to the side of the string coil 11 by an adhesive, so that the edge portion of the string 11a positioned on the side of the string coil 11 is bent. Deformation is prevented. Thus, during transport or storage, several string coil devices 10 can be safely stacked with their axes aligned vertically. In addition, in the above-described string coil device 10, the central flap 12a is inserted into a hollow 11b formed along the axis of the string coil 11, and is inserted inside the string coil 11 surrounding the hollow 11b. The central flap 12a is joined by the adhesive to the innermost string 11a constituting the cylindrical surface. Due to the central flap 12a bonded by the adhesive, the innermost end of the string 11a does not loosen itself, so that the innermost string is not fixed by a joining means such as melt-bonding. Even in the case of the string coil 11 remains firm and solid.

When used in an automatic packaging machine for automatically tying a corrugated cardboard box or other article with the string 11a, the string coil device 10 is loaded onto a string coil reel installed above the packaging machine. Since the edge of the string 11a is not deformed or bent, the string 11a can be smoothly released from the string coil device 10. The operation of smoothly releasing the string 11a by the pad bonded to the side of the string coil 11 is not disturbed. The reason is that in the small area that is the edge of the string 11a constituting the side of the string coil 11, the bond between the pad 12 and the side of the string coil 11 is effectively made, so that excessive adhesive force is applied to the string 11a. Because it does not act on. In addition, the innermost end of the string 11a is easily peeled off from the central flap 12a.

When the string 11a is unwound from the string coil device 10, a pair of pads 12 remain. Each pad 12 is restored to its original flat shape since the mid-sized flap 12a is restored to be horizontal to the ring 12b. The flat pad 12 is easy to recycle repeatedly because it is suitable for transport and storage.

As an adhesive applied to one surface of the pad 12, a general rubber adhesive and an acrylic adhesive can be used. As long as the adhesive has the necessary adhesion to the edge of the string 11a, the type of adhesive is not limited to a particular kind. It is also possible to use double-sided adhesive tape instead of adhesive. In this case, before forming the dividing line for the center flap 12a, it is also possible to apply a double-sided adhesive tape to the whole one surface of the pad 12. As shown in FIG. Thereafter, the taped pad 12 is cut along the dividing line inside the chain line 12c to form the center flap 12a.

Incidentally, the material of the pad 12 is not limited to corrugated cardboard paper. For example, pads are made from relatively easy-to-recycle cardboard, polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), and other thermoplastics as materials. It may be. The pad 12 has a disk shape with an outer diameter of about ± 10 mm and a thickness of about 0.5 mm or more and 5 mm or less with respect to the string coil 11.

As described above, first, a pair of flat pads 12 are placed on the side of the string coil 11 with the center flap 12a open, and then the center flap 12a is folded inward, thereby providing a pad ( 12) to the string coil (11). Alternatively, before winding the string 11a, one of the pads 12 may be installed at one end of the winding coil of the winding machine with the center flap 12a extended. After the string 11a is wound to become the string coil 11, and after the winding coil is removed from the string coil 11, another pad 12 is installed on the other side of the string coil 11, The string coil device 11 is completed. Since the pre-installed pad 12 prevents the string coil 11 from being unwound during production, the finished string coil 11 has a structure that prevents the string coil 11 from being released or separated during transportation and storage. It is also possible to install the second pad 12 on the string coil 11 thus installed. Therefore, this arrangement ensures efficient productivity.

When the adhesive is applied to an entire surface of the pad 12, it is advantageous to install a release paper on the surface to which the adhesive is applied. The release paper prevents the pads 12 stacked to be in contact with each other to be bonded to each other, so that a large number of pads 12 can be transported safely.

As shown in FIG. 35, the pad 12 may extend outward from the perimeter of the pad 12 and may include a plurality of triangular shaped outer flaps 12d formed at equal intervals along the perimeter. In order to provide the string coil device 10, first, a pair of pads 12 are positioned to face each other with respect to one side of the string coil 11. Secondly, the center flap 12a is folded inward. Finally, the outer flap 12d is folded to contact the outer cylindrical surface of the string coil 11. Accordingly, the outer flap 12d is bonded by an adhesive not only to the outer cylindrical surface of the string coil 11 but also to the outermost end of the string. As a result, the outermost end of the string 11a is not released from the string coil 11.

In addition, as long as the innermost end of the string 11a is fixed to the string coil 11 whose axis is defined by the hollow 11b by fusion bonding or the like, the pad 12 is used instead of the central flap 12a. It may also include a central hole. A pair of pads 12 comprising holes instead of the central flap 12 are positioned on the side of the string coil 11 in a similar manner as above and fixed by an adhesive. In addition, when the string coil devices 10 are stacked, this kind of pad 12 prevents the edge of the string 11a constituting the side of the string coil device 10 from being deformed or bent.

Another embodiment of the string coil device 10 will be described with reference to FIGS. 36 to 38. 36 (a) is a front view showing another structure of the string coil device according to the present invention, and as shown in the figure, a shape retention plate longer than the inner circumference of the string coil is provided. 36 (b) is a front view of the same structure, in which a frame holding plate having a length shorter than the inner circumference of the string coil is provided. 37 is a front view showing the frame holding plate applied to the string coil device described above. Figure 38 (a) is a perspective view showing a frame holding plate of another structure, Figure 38 (b) shows a cross section of the frame holding plate applied to the inside of the string coil.

As described above, the string coil 11 has the innermost end of the string 11a fixed by the fusion bond in order to prevent the string from being released or separated. A feature of the string coil device of this embodiment is that a frame holding plate 92 of flat shape is inserted and rolled into the hollow 11b of the string coil 11. The frame holding plate 92 is a plate made of a synthetic sheet of paper such as polypropylene and polyester, or a sheet made of a sheet of paper or other sheet containing a metal such as a thin steel sheet or a mixture of waste paper and a plastic recovered to the ground state. to be. The length of the frame holding plate 92 is substantially the same as the circumference of the hollow 11b of the string coil 11, and the width thereof is substantially the same as the string coil 11. When it is rolled into the cylindrical structure, the frame holding plate 92 continues to have a restoring force to restore the original flat shape. Therefore, during the insertion into the hollow 11b, the mold holding plate 92 exerts a pressure to push the inner cylindrical surface of the string coil 11 by the restoring force, so that the frame holding plate 92 is the string coil ( 11) to support the inner cylindrical surface. The frame holding plate 92 may be formed longer than the inner circumference of the string coil 11 so as to overlap each other at the end as shown in Fig. 36 (a). On the other hand, it may be formed shorter than the inner circumference of the string coil 11, and as shown in Fig. 36B, a gap may be left between the ends thereof.

FIG. 37 shows a modification of the frame holding plate 92 described above. In the frame holding plate 96 shown in this figure, a pair of slits 93 are formed at one end, and the slits 93 are parallel to the widthwise side in the width direction of the frame holding plate 96. And a pair of extensions 94 having a width corresponding to the slit 93 at the other end thereof. In the state where the extension part 94 is fitted in the slit 93, the frame holding plate 96 is rolled and inserted into the hollow 11b. When the frame holding plate 96 is pressurized by the restoring force on the inner cylindrical surface of the string coil 11, the extension 94 is released from the slit 93. The frame holding plate 96 effectively prevents the end from slipping.

For the same purpose, the ends of the frame holder may comprise inverted L-shaped extensions which hang on each other in a dried state. Any structure is possible as long as the ends of the plates are connected to each other so as to be detachable. While the ends of the plates are detachably connected, the shape retaining plate may overlap only at the ends or the connectable portions.

FIG. 38 shows a frame holding plate 97 of another structure, wherein the frame holding plate 97 includes a frame piece 95 protruding from both sides in the longitudinal direction of the frame holding plate 92. do. In this embodiment, the string coil is fitted between the frame pieces 95 in contact with the frame holding plate 97. Therefore, even when the string coil is repeatedly loaded and unloaded on the bobbin of the automatic packaging machine, the frame holding plate 97 does not slip out of the string coil. In addition, the rim piece 95 reinforces the rim of the innermost layers wound along the axial end of the string coil and prevents it from disassembling.

Any of the frame holding plates 92, 96, and 97 described above can be recycled, and thus economically useful.

As a specific example, the above three mold holding plates can be made of the resin sheet in which the restored polyester and the waste paper are blended in a ratio of two to three. The frame holding plate of the first sample has a width of 190 mm, a length of 700 mm, and a thickness of 1 mm. The frame holding plate of the second sample has a width of 600 mm, and two slits parallel to the width direction of the plate are formed at a position 50 mm inward from the end thereof, each of which has a length of 35 mm and a width of 30 mm, At its other end, two extensions having a length of 100 mm and a width of 30 mm are integrally formed. The frame holding plate of the third sample has the same dimensions as the first sample, and includes three edge pieces having a height of 3 mm formed at equal intervals on each side in the longitudinal direction of the shape retaining plate. Each sample is inserted into the hollow of the polypropylene string coil, where the sample is pressurized by the restoring force on the inner cylindrical surface of the string coil. In order to carry out a loadability test or drum-set test, each polypropylene string coil device is loaded on a bobbin of an automatic packaging machine and separated from the bobbin. After loading and detachment for 10 seconds, none of the string coils supported by the three samples described above were loosened or disassembled on the inner cylindrical surface. In the comparative example performed on the polypropylene string coil not supported by the frame holding plate, after 5 seconds of loading and detaching, the inner cylindrical surface portion of the string coil was released.

3. Automatic packaging machine

The description of the automatic packaging machine of the present invention for tying a corrugated cardboard box or other article using the coreless string coil 11 is as follows. The operation of the automatic packaging machine will be described schematically with reference to FIG.

Automatic packaging machine 40 includes an article 47, such as a corrugated cardboard box, and a stand 41 for supporting the arch 48, with the arch 48 being installed on the article 47. . The cassette-shaped string coil bobbin 47 on which the coreless string coil 11 is mounted is installed outside the stand 41.

A pair of feed rollers 43 in which the string 11a is inside the keep box 44 of the stand 41 with the string coil 11 loaded on the bobbin 50. It is pulled by, the string (11a) is temporarily inside the keep box (44). The strap 11a in the keep box 44 is transferred to the arch 48 by a shooter 45 and a pair of draw-out rollers. The strap 11a moves along the arch 48 to wind the article 47 located on the stand 41.

40 (a) and 40 (b) show two types of packaging machines 40 having different installation positions of the string coil reel 50. In FIG. 40A, the spindle of the bobbin 50 is located in the stand 41. In FIG. 40B, the spindle 49 of the reel 50 protrudes from the outer surface of the automatic packaging machine 40.

The packaging machine of the present invention has a string coil reel that can be applied to two types of packaging machines.

FIG. 41 is a cross-sectional view showing a cassette type string coil bobbin 50 having a coreless string coil 11 loaded thereon. The bobbin 50 is provided with the cover 57 which covers the side surface of the string coil 11.

FIG. 42A is a cross-sectional view of the bobbin 50 from which the lid 57 and the string coil 11 are removed, and FIG. 42B is a side view of the arrow A direction shown in FIG. The string coil bobbin 50 includes a screw rod 52 which projects vertically from the side plate 51 and is rotatably installed, and which is located outside the stand 41. ). As shown in FIG. 40 (b), the screw rod 52 is integrally fitted to the spindle 49 protruding vertically from the outside of the stand 41. The rotation of the spindle 49 is stopped by the spindle brake 42. The screw rod 52 is fitted to the outside, it is formed integrally at the handle 53 and the end portion for turning the screw rod 52. The threaded rod 52 is fitted to the cylindrical sliding member 54, whereby the sliding member 54 slides in the axial direction of the threaded rod 52 by rotation.

Four core plates 55 installed vertically on the side plate 51 surround the screw rod 52. The core plate 55 constitutes a core element inserted into the hollow 11b which defines the axis of the coreless string coil 11. After the core plate 55 is inserted into the hollow 11b, the core plate 55 is bent to be positioned along the inner cylindrical surface of the string coil 11. Each core plate 55 is connected to a sliding member 54 in which a screw rod 52 is fitted by a pair of parallel link rods 56. The four core plates 55, the pair of connecting rods 56, and the sliding member 54 corresponding thereto constitute a parallel connection structure.

Therefore, when the screw rod 52 rotates to separate the sliding member 54 from the side plate 51, the parallel connection structure makes the core plate 55 approach the screw rod 52 uniformly. On the other hand, if the screw rod 52 is rotated in the opposite direction to move the sliding member 54 toward the side plate 51, the parallel connection structure moves the core plate 55 evenly away from the screw rod 52. Let's do it. When the sliding member 54 is located closest to the side plate 51, as shown in Figs. 43 (a) and 43 (b), the core plate 55 is positioned farthest from the screw rod 52. do. In this state, the core plates 55 are positioned at intervals from each other in the circumferential direction along the center circle of the screw rod 52.

When the core element is inserted into the hollow 11b of the string coil 11, the core plate 55 is far from the screw rod 52, and thus pressure is applied to the inner cylindrical surface of the string coil 11. Will receive. In this state, the lid 57 shown in FIGS. 44A and 44B is provided on the side of the string coil 11. The cover 57 constitutes a cover disc 57a corresponding to the side surface of the string coil 11. The cover disc 57a also includes four projections 57b extending vertically from the cover disc 57a, each positioned distant from each other at equal intervals in the circumferential direction at the center of the radius. At the end of each projection 57b, a locking structure is formed. When the core plate 55 is located farthest from the screw rod 52, the protrusions 57b enter the space defined by the core plate 55, and their ends are caught by the inner surface of the core plate 55. .

On this cassette-type coil coil bobbin 50, the string coil 11 is loaded in the following steps. With the cover 57 removed, the handle integrated at the end of the screw rod 52 is operated in the bobbin 50 to turn the screw rod 52 in the set direction. At this time, the sliding member 54 moves away from the side plate 51 and the core plate 55 slides uniformly in the direction close to the screw rod 52. As a result, the core plate 55 forms a core element of reduced diameter. As shown in FIG. 45 (a), the core plate 55 is located close to the screw rod 52 forming the reduced core element, and the core plate 55 is formed along the axis of the string coil 11. The string coil 11 is fitted to the core element in such a state that it can enter 11b.

The string coil 11 can slide along the core element until its side contacts the side plate 51. Thereafter, as shown in Fig. 45B, the handle 53 is operated to turn the screw rod 52 in the opposite direction. In this case, the sliding member 54 moves toward the side plate 51, and the core plate 55 slides uniformly away from the screw rod 52. As shown in FIG. As a result, the core plate 55 increases the diameter of the core element described above. At this time, the outer surface of the core plate 55 is in uniform contact with the inner cylindrical surface of the string coil 11 surrounding the hollow 11b. By moving the core plate 55 further away from the screw rod 52, the core plate 55 is subjected to a stronger pressure on the inner cylindrical surface of the string coil 11. Screw rod 952 can rotate until sliding member 54 is closest to side plate 51. Finally, the core plate 55, which can be slid in a uniform and synchronized manner, constitutes a cylindrical core element of circular cross section, whereby the core element is pressed against the inner cylindrical surface of the string coil 11 and hollow ( 11b) changes shape to circular cross section.

Therefore, the core element composed of the core plate 55 corrects the deformation of the hollow 11b of the string coil 11 correctly. As shown in Fig. 46 (a), when the hollow 11b having a circular cross section is deformed into an elliptical cross section, the string coil 11 has an elliptical cross section similarly deformed. However, the core element is inserted into the hollow 11b because its diameter is reduced. Once inserted into the hollow 11b, the core element is expanded in the radial direction by moving the core plate 55 away from the screw rod 52 in a uniform and synchronized manner. As a result, the core element changes the hollow 11b and the string coil 11 back into the circular cross-sectional shape shown in Fig. 46 (b).

After the string coil 11 is fixed to the circular cross section, a cover 57 is installed on the string coil 11. As shown in Fig. 45 (b), the cover disc 57a on which the protrusion 57b is formed is positioned to face the side of the string coil 11. In the core element obtained by moving the core plate 55 farthest from the screw rod 52, the protrusion 57b can move toward the inner space while in contact with the inner surface of the core plate 55. Therefore, the cover disc 57a is in contact with the side surface of the string coil 11, and in that state, the locking structure at the end of the protrusion 57b prevents the inner surface of the core plate 55 shown in FIG. Therefore, in the state where the cover disc 57a covers the side surface of the string coil 11, the cover 57 rests on the core element.

Following loading of the string coil 11, the reel 50 is to be installed on the spindle 49 of the packaging machine 40. While the string 11a is released from the string coil 11, the bobbin 50 rotates with the string coil 11.

As described above, the entire outer surface of the core element composed of the core plate 55 supports the inner cylindrical surface of the string coil 11, whereby the inner cylindrical surface of the string coil 11 is pressurized to provide a circular shape. Becomes the cross-sectional shape of. Therefore, even when the string 11a is consumed to the innermost layer or the adjacent layer thereon, the string coil 11 remains firm and the string 11a is stably pulled to the innermost end. do.

Except for the screw rod 52 and some other members, it is preferable that the material of the bobbin 50 be made of a light material such as aluminum, thereby effectively pulling the string 11a out of the string coil 11. The reel 50 is rotated and can be easily stopped during rotation by inertia.

The bobbin 50 of this embodiment is designed to fit the string coil 11 having the specifications listed below. The string coil 11 is completed by winding the string 11a in a spiral direction.

[String 11a]

Material: Polypropylene

Length: 2,000 m

Width: 15.5 mm

Thickness: 0.65 mm

[Tail Coil (11)]

Internal diameter: 250 mm (diameter of hollow (11b))

Outer diameter: 455mm

Weight: 9.6kg

As measured when the core plate 55 is located farthest from the screw rod 52, in the bobbin 50, the core plate 55 is designed such that the core element has an external diameter of 250 mm.

In order to test the packaging capability of the specifically designed bobbin 50 as described above, the packing machine 40 is operated by operating the packing machine 40 with the bobbin 50 loaded with the polypropylene string coil 11 loaded therein. Wrapped goods. In each of the polypropylene string coils 1, the outermost and innermost ends of the string 11a were joined by melt-bonding regions formed along the periphery of the hole 11d as shown in FIG. The string coil 11 was then deformed into an elliptical cross section with an eccentricity ratio (calculated as the ratio of the longest inner diameter / shortest inner diameter in the hollow 11b) of 1.00, 1.05 and 1.10, respectively. In the test, it was found that while the deformed string coil 11 is loaded onto the bobbin 50, there is no string that is loosened or separated from the innermost cylindrical surface of the string coil 11. In addition, by using all the string coils 11 in the bobbin 50, the packaging machine 40 can smoothly unwind the string to the innermost end.

FIG. 47 is a side view showing the string coil bobbin 60 of another structure in which the string coil 11 is loaded. This bobbin 60 also has a lid 67 covering the side of the string coil 11.

48 (a) shows a side view of the reel 60, the string coil 11 and the cover 67 is removed, Figure 48 (b) is a front view as seen in the direction of the arrow (A) of Figure 48 (a). to be. Figure 49 (a) is a side of the reel 60, the string coil and the cover has been removed, a portion thereof is shown broken to explain the operation, Figure 49 (b) is an arrow (A) of Figure 49 (a) It is the front view seen from) direction. The bobbin 60 has a screw rod 62 fitted outwardly at the end and a portion adjacent thereto, and has a disk-shaped fixing plate 63 fixed at the basal end of the screw rod 62. The screw rod 62 and the fixing plate 63 are arranged perpendicular to each other, and the screw rod 62 extends through the center of the fixing plate 63. The perimeter of the entire fixing plate is defined by a guide portion projecting toward the far end of the screw rod 62. The protruding edge of the guide portion 63a is slightly inclined with respect to the axis of the screw rod 62.

The disc-shaped fixing plate 63 includes a pair of core half 64 constituting a core element wrapped around the screw rod 62 and inserted into the hollow 11b of the string coil 11. Each of the core halves 64 has a substantially semi-cylindrical core plate 64a and a half-annular flange 64b, the flanges 64b of which the core plate 64a is fitted to the stationary plate 63. It protrudes vertically and outward from the basal side of.

The base side of each core plate 64a surrounds half of the circumference of the guide portion 63a of the fixed plate 63. At both ends of the base side, the core plate 64a is axially coupled to the guide portion 63a by the pin 65, so that the extreme side of one core plate 64a is one of the other. The corresponding part of the core plate 64a can be accessed and retracted. The lateral sides of each of the core plates 64a are inclined with respect to the flange 64b, so that when the extreme sides become accessible to each other, the core plates 64a The cone is cut off.

As shown in FIG. 47, after the core element is completely engaged with the string coil and the lid 67, the penetrated end of the screw rod 62 is fitted with the nut 68. As shown in FIG.

Fig. 50A is a side view of the lid, and Fig. 50B is a front view taken in the direction of arrow A in Fig. 50A. The lid 67 is composed of a lid disc 67a including a hole 67b at the center through which the screw rod 62 passes. On one surface of the lid disc 67a, a pair of guide plates 67c protrude perpendicularly to two corresponding positions on the center circle of the hole 67b. Each guide plate 67c is bent along the circumference of the center circle of the hole 67b, and its width decreases toward the head. Between these guide plates 67c a pair of parallel push plates 67d extends from the cover disc 67a at two corresponding positions with respect to the hole 67b. These push plates 67d are tapered toward their heads and slightly protrude slightly than the guide plates 67c.

On this string coil bobbin 60, this string coil 11 is loaded through the following process. First, referring to FIG. 51 (a), the end faces of the pair of core halves 64 rotatably face each other such that the core plates 64a are cut together in the shape of a truncated cone one end in diameter. Constitutes a core element. The core element composed of the facing core plates 64a is inserted into the hollow 11b of the string coil 11b from its reduced end.

When the core element enters into the hollow to some extent, the side surface of the string coil 11 comes into contact with the flange 64b of the core halves 64, as shown in Fig. 51B. In this step, the lid 67 is located on the core halves 64 so that each guide plate 67c can be advanced between the corresponding lateral sides of the core plates 64a. By sliding the lid 67 toward the string coil 11, the core plates 64a are rotatably arranged in the direction of the distal ends separated from each other, and the heads of the push plates 67d are the core plates. Enter the space surrounded by fields. After a while, the heads of the guide plates 67c advance along the corresponding horizontal sides of the core plates 64a, with the rotatable arrangement of the core plates 64a in the direction of the ends further separated from each other. . By sliding the lid 67 to the extreme, the push plates 67d and the guide plates 67c open the reduced ends of the core element constituted by the core plates 64a. Therefore, this core element is forced into a cylindrical shape having the same diameter and the circular cross section axially. As a result, the outer surfaces of the core plates 64a are pressed against the inner cylindrical surface of the string coil 11 having a circular cross section.

When these core plates 64a are designated in the form of cylindrical core elements, the flanges 64b of the core halves 64 stand perpendicular to the threaded rod 62, and the one side surface of the string coil 11 Contact with In this state, the lid disc 67a is in contact with the other surface of the string coil 11, while the end of the screw 62 protrudes from the lid disc 67a through a hole 67b provided at its center. .

In order to complete the loading of the string coil 11, the cover disc 67A is screwed by tightening the nut 68 at the end of the screw rod 62 protruding from the cover disc 67a as shown in FIG. It is locked by the rod 62.

For packaging purposes, this string coil bobbin 60 loaded with string coils is fitted on the spindle 49 of the packaging machine 40.

The bobbin 60 of this embodiment is designed to fit the following specific string coil 11. This string coil 11 is prepared by a string 11a wound in a spiral.

String (11a)

Material: Polypropylene

Length: 2,500 m

Width: 15.5 mm

Thickness: 0.65 mm

String Coil (11)

Internal diameter: 200 mm (diameter of hollow 11b)

Outer diameter: 450 mm

Weight: 12 kg

In this bobbin 60, the core plates 64a are designed to give a core element having an outer diameter of 200 mm measured when the core plates 64a expand in diameter.

In order to inspect the packaging of the specially designed bobbin 60, the bobbin 60 loaded with the polypropylene string coil 11 was provided, and the packaging machine 40 was actually operated to wind various articles. In each of the polypropylene string coils 11, the innermost and outermost ends of the string 11a are bounded by a melt-bonding region 11e formed along the outer periphery of the drilled hole 11d as shown in FIG. The string coil 11 was then deformed into elliptical cross sections of eccentricity ratios (calculated as the ratio of the longest inner diameter / shortest inner diameter of the inner hollow 11b) of 1.00, 1.05 and 1.10, respectively. When the deformed string coil 11 was loaded on the bobbin 60, none of them were lined up or integrated with the string 11a on the inner cylindrical surface of the string coil 11 so as not to be seen. In addition, each string coil 11 in the bobbin 60 allows the packaging machine to gently pull the string 11a to the innermost end.

This bobbin is suitably made of a light material such as aluminum, except for the core halves 64, the stationary plate 63, and other parts where strength is required. As a result, the bobbin 60 rotates sufficiently to pull the string 11a from the string coil 11, but stops immediately upon rotation by inertia.

In the above embodiment, the screw rod 62 is designed to be fixed on the spindle 49 of the packaging machine 40. Optionally, the threaded rod 62 may be integrated with the spindle 49 or perform a dual role of the spindle 49 and the threaded rod 62.

It will be appreciated that the components of the core element of the bobbin 60 are not limited to a pair of core halves. These core elements can be composed of multiple core pieces (eg, quarter core pieces).

Another string coil reel 70 is shown in FIGS. 52 (a) and 52 (b). Fig. 52 (a) is a cross section, and Fig. 52 (b) is a schematic cross section taken along the line B-B in Fig. 52 (a). This reel 70 includes a hollow shaft 71 fixed on the spindle 49 of the packaging machine 40. This spindle 49 extends through the interior of the shaft 71 and passes through its outer surface. The shaft 71 and the spindle 49 inserted through it rotate at the same time. A groove 49a is formed in the distal end of the spindle 49 protruding out of the shaft 71. One end of the shaft 71 associated with the base end of the spindle 49 maintains the same center as the disk-shaped side plate 72.

The shaft 71 is surrounded by four core plates 74 constituting a core element inserted into the hollow 11b of the string coil 11. Each of the core plates 74 actually has the same length as the axial length of the shaft 71, each of which is bent in the circumferential direction of the shaft 71. The inner surface of each of the core plates 74 holds a pair of slide axes 73, at proper intervals from each other in the axial direction of the shaft 71, and extends in the radial direction of the shaft 71. A pair of slide shafts 73 are slidably applied in a pair of cylindrical holders 75 fitted to the shaft 71.

The four pairs of holders 75 extend radially from the axis, at circumferentially equal intervals from each other. In each pair, the two holders 75 are detachably disposed near the distal end of the shaft 71. The pair of slide shafts 73 fitted to the core plates 74 have a pair of elastic springs 76. These springs 76 exert a force on the core plate 74 toward the shaft 71.

The shaft 71 includes an air passage 71a associated with each holder 75. Both ends of this air passage 71a are open to the distal surface of the shaft 71 associated with the distal end of the spindle 49. One end of the air passage 71a is an air input port 71b provided with a confirmation valve, and the other end is an air output port 71c that is opened and closed by an air output cock 77.

When compressed air is injected from the air nozzle into the air inlet 71b, this air is supplied to the air passage 71a via the check valve. When the air outlet 71c is closed by the cock 77, the compressed air in the air passage 71a is supplied to all of the holders 75. This air pressure allows the slide shaft 73 fixed in the holder 75 to slide out against the force of the elastic spring 76.

The far end of the spindle 49, which extends through the shaft 71, has failed at the same center as the disc-shaped cover 78. The cover 78 is fixed on the spindle 49 by a nut which is rotated downward along the groove 49a formed in the distal end of the spindle 49 while maintaining contact with the edges of the core plates 74.

In the bobbin 70 of this structure, the string coil 11 is loaded in the following manner. First, the nut 79 and the cover 78 are detached from the spindle 49. In this step, each core plate 78 is subjected to the shaft 71 by the elastic spring 76 fixed on the pair of slide shafts 73. Therefore, the core element composed of the core plates 74 is reduced in diameter and approaches the axis 71.

When the core plates 74 constitute a core element of reduced diameter, the string coil 11 is fixed on the core plates 74. Even when the string coil 11 has a modified elliptical radius cross section, the reduced core element allows for easy fixing of the string coil 11.

After the string coil 11 is fixed on the core plates 74, the compressed air is supplied to the air passage 71a through the open air input port 71b on the distal surface of the shaft 71. Since the air outlet 71c remains closed by the coke 77 during the air injection process, the air given to the air passage 71a is supplied to all the holders 75. Air pressure allows the slide shaft 73 fixed in the holders 75 to slide outward against the force of the elastic spring 76. As a result, the slide shafts 73 fitted in pairs on the core plates 74 are simultaneously disposed outwardly in a uniform and simultaneous manner. As a result, the core elements composed of the core plates 74 expand in diameter until the outer surface of each core plate 74 is pressed against the inner cylindrical surface of the string coil 11. In connection with the expansion of the core elements, the cross section of the string coil 11 is reformed into a circular cross section even though it is deformed into an elliptical cross section.

Once the string coil 11 has a circular cross section, the air injection is completed at the air inlet 71b. Thanks to the check valve of the air inlet 71b, the air introduced into the air passage 71a will not leak.

Finally, the cover 78 is fixed on the spindle 49 in contact with the side surface of the string coil 11. The cover 78 is locked by turning the nut 79 along the groove 49a formed in the spindle 49.

The string coil 11 is now loaded onto the string coil take-up 70 and the packaging machine can wind the article by pulling the outermost end of the string 11a located on the outer cylindrical surface of the string coil 11. When the string in the string coil 11 falls on the bobbin 70, air filled in the air passage 71a is released by the action of the cock 77 which opens the air output port 71c. When air flows out, each core plate 74 constituting the core element causes a pressure of the elastic spring 76 which reduces the core elements in diameter.

53 shows a further alternative embodiment of the string coil reel. This string coil bobbin 70 'is basically similar to the bobbin 70 shown in FIG. The difference is that the shaft 71 is coupled to the spindle 49 of the packaging machine 40, and the spindle 49 is connected to the air passage 71a and the air discharge line 49b, respectively, in the shaft 71. To include line 49c. Although not shown, the elastic springs are fixed on the pair of slide shafts 73 fitted to the core plates 74, respectively.

The air supply line 49b and the air discharge line 49c in the spindle 49 are connected to a rotary joint 81. The compressor 83 supplies the compressed air to the rotary joint via the air filter 84, the regulator 85, the oiler 86 and the electromagnetic supply valve 82. The compressed air passing through the rotary joint 81 flows to the air supply line 49b. On the other hand, the air from the air discharge line 49c flows out through the rotary joint 81 and the electromagnetic discharge valve 87.

In order to load the string coil 11 in the bobbin 70 'as shown in Fig. 54A, the nut 79 and the lid 78 are detached from the spindle 49. By opening the electromagnetic release valve 87, air filled in the holders 75 is discharged through the air discharge line 49c in the spindle 49. As a result, the core plates 74 constituting the core elements are pressed toward the shaft 71 by the elastic spring, and reduce the diameter of the core element. Electromagnetic emission 87 is then closed.

In the next step, the string coil 11 is fixed on the core elements reduced in diameter composed of the core plates 74. Even when the string coil 11 is deformed into an elliptical cross section as shown in Fig. 54 (b), the reduced core element allows easy fixing on the core string coil 11. At that time, the cover 78 is placed on the spindle 49 and the nut 79 is turned and locked along the groove 49a formed in the spindle 49, thereby contacting the side surface of the string coil 11. Keep it.

After the string coil 11 is fixed on the core element composed of the core plates 74 (Figs. 54 (c) and (d)), the electromagnetic supply valve 82 supplies compressed air to the air in the spindle 49. Supply to the holders 75 through the supply line (49b). As the air pressure allows the slide shaft 73 fixed in the holders 75 to slide outward, the core plates 74 are externally disposed in a coupled and synchronized manner, which in turn leads to the string coil 11 ( And against the inner cylindrical surface of FIG. 54 (e). When the core element composed of the core plates 74 extends into a cylinder of circular cross section, the elliptical cross section of the string coil 11 is reformed into a circular cross section (Fig. 54 (f)). Once the string coil 11 acquires a circular cross section, the electromagnetic feed valve 82 is closed.

Following the loading of the string coil 11, the packaging machine 40 winds up the article 47. When the string 11a falls off the bobbin 70 ', the electromagnetic discharge valve 87 draws air filled in the holders 75 to the air discharge line 49c (Figs. 54 (g) and (h)). Allow release through. As a result, the core plates 74 cause the force of the elastic spring, whereby the core element is reduced in diameter.

The ways of the present invention are not limited to the embodiments described herein. For example, the string 11a of the string coil 11 made of olefinic resin or other thermoplastic resin can be prepared by applying a thermoplastic resin on the outer surface of the basic string made of paper or fiber.

The marking string coil according to the present invention is firmly fixed to prevent the innermost string end from being unwound, and for the article, the string can be gently pulled from the innermost end. In addition, the packaging string coil device and packaging machine according to the present invention effectively prevents the deformation of the string coil.

Claims (30)

It consists of a plurality of layers of packaging strings spirally wound without a core around an axially defined hollow, said strings being made of a thermoplastic resin on at least an outer surface thereof, with a number of perforations close to the innermost string ends. A wrapping string coil, characterized in that it is punched through a plurality of stacked string layers, and the string layers stacked thereon are bonded to each other in a melt bonding region formed along the circumference of each of the perforation holes. The wrapping string coil of claim 1, wherein the plurality of perforation holes are drilled through a plurality of string layers stacked below and proximate to the outermost string ends. The method according to claim 1, wherein the drilling holes are defined by the circumferential length, setting, and position, as well as the number of laminated string layers in which the drilling holes extend. The variables are based on the material, whereby the width and width of the packaging string are balanced between the bond strength and the separation strength of the laminated string layer. Winding one end of the innermost string on a winding roller, and stacking a plurality of layers on the innermost strapping unit; Perforating the string layers laminated with a perforator heated to a predetermined temperature to form perforations and melting the circumference thereof; Withdrawing the perforator from the laminated strap layer to melt-bond the circumference of the perforation hole; Winding the string to the required length on the winding roller to form a string coil; The method of producing a packaging string coil of claim 1, comprising the step of removing the winding roller from the string coil. 5. The winding roller of claim 4, wherein the winding roller can be expanded or reduced in diameter and the winding roller is expanded in diameter when the string is wound thereon to form the string coil. Method for producing a packaging string coil, characterized in that removed from the string coil. Winding one end of the innermost string on a winding roller, and stacking a plurality of layers on the innermost strapping unit; Illuminating a laser beam on the laminated string of layers to form a melt-bonding of the drilled hole and its circumferential surface; Winding the string to the required length on the winding roller to form a string coil; The method of producing a packaging string coil of claim 1, comprising the step of removing the winding roller from the string coil. 7. The winding roller of claim 6, wherein the winding roller can be expanded or reduced in diameter, and the winding roller is expanded in diameter when the string is wound thereon to form the string coil. Method for producing a packaging string coil, characterized in that removed from the string coil. A plurality of layers of wrapping straps spirally wound without a core around an axially defined hollow, said straps being made of thermoplastic resin at least on an outer surface thereof, the part of said straps forming an inner cylindrical surface around the hollow, the other part of the straps Packaging string coil, characterized in that coupled to peel off by an adhesive. The wrapping string coil according to claim 8, wherein a portion of the string wound spirally without a core around the hollow is detachably bonded to another portion of the string stacked on an upper surface by an adhesive. The wrapping string coil according to claim 8, wherein the plurality of string layers stacked along both ends of the hollow shaft are detachably bonded to each other by an adhesive. The wrapping string coil of claim 8, wherein a plurality of adjacent rows of the spirally wound strings are releasably bonded to each other by an adhesive applied on an inner cylindrical surface around the hollow. 10. A wrapping string coil as claimed in claim 8 wherein said adhesive is a solvent type adhesive. 9. A wrapping string coil according to claim 8, wherein said adhesive is a hot-melt-type adhesive. Spirally winding one end of the innermost string on a winding roller to form an innermost string layer; Applying an adhesive to an upper surface of the string wound on the winding roller; Spirally winding the string to the required length onto the adhesive-coated portion of the string to form a string coil; The method of producing a wrapping string coil of claim 8, characterized by removing the winding roller from the string coil. 15. The method of claim 14 wherein the adhesive is applied by pressurizing the applicator roller of the applicator against the innermost strap wound around the winding roller. 15. The method of claim 14 wherein the adhesive is continuously injected using an applicator moving along the latter between the innermost string layer wound on the winding roller and the string laminated thereon. Winding one end of the innermost string on the winding roller, applying an adhesive on a plurality of string layers laminated along each end on the axis of the winding roller; Winding the string to the required length on the winding roller to form a string coil; The method of producing a wrapping string coil of claim 8, characterized by removing the winding roller from the string coil. 18. The method of claim 17, wherein the adhesive is sprayed onto the string layers laminated along each end on the axis of the winding roller. At least an outer surface of the packaging string coil made of a thermoplastic resin, the packaging string coil wound spirally without a core around the hollow defined by the axis; Wrapping string coil device, characterized in that consisting of a pair of disc pads attached to each side of the string coil and peelable with an adhesive, located in the same center. 20. The wrapping string coil device of claim 19, wherein each disc pad consists of a plurality of central flaps on its center, the flaps being folded into a hollow defined axially of the string coil. 20. A wrapping string coil device according to claim 19, wherein each disc pad is comprised of a plurality of outer flaps on its outer circumference, said flaps being folded onto an outer cylindrical surface of said string coil. At least on the outer surface is a wrapping string coil made of thermoplastic resin, wrapped around the hollow in a spiral shape without a core, In fact it consists of a frame holding plate covering the inner cylindrical surface around the hollow, The frame holding plate is rolled and inserted into the hollow, wrapping string coil device characterized in that to support the inner cylindrical surface of the string coil by the restoring force in the release direction. 23. The wrapping string coil device of claim 22, wherein the frame holding plate has a portion connectable to each other at each vertical end portion thereof. 23. The mold holding plate of claim 22, wherein the frame holding plate further comprises a pair of slits formed in parallel and proximate to one transverse end, and a pair of extensions protruding from the other transverse end, wherein the frame holding plate further comprises: Wrapping coil device characterized in that the roll is inserted into the hollow by the extension portion fixed to. 23. The wrapping string coil device of claim 22, wherein the frame holding plate further comprises a plurality of edge pieces provided on each of the transverse ends that hold the vertical edge of the string coil. A string coil bobbin adapted to a wrapping string coil consisting of a wrapping string spirally wound without a core around an axially defined hollow, the string being pulled in accordance with the rotation of the string coil and automatically wrapped around the article by a wrapping machine Tied at the outer surface, the at least one end of which is made of thermoplastic, and the at least one end can be reduced in diameter so that the cord coil reel can be inserted into the hollow of the string coil, and the inner cylindrical surface around the hollow is Characterized in that it consists of a core element that can be expanded in diameter in a cylindrical shape of a circular cross section inside the hollow so as to be pressed against a portion of the constituent string, the helical wrapping around the hollow without the core wrapped around the core A packaging machine having a string coil reel adapted to a packaging string coil. 27. The wrapping machine according to claim 26, wherein the core element is composed of a plurality of core plates forming a cylindrical circle of the extended core element, and each of the core plates is arranged in a radial direction. . 28. A wrapping machine according to claim 27, wherein the core plates are arranged in a link mechanism. 28. A wrapping machine according to claim 27, wherein the core plates are arranged at air pressure. 27. The core element of claim 26, wherein the core element consists of a plurality of core pieces that form a cone that is cut together when facing each other, and the core element shrinks in diameter when the ends of each core piece approach the other. And the core element extends in diameter when the ends of each of the core pieces are further separated from the other.