JPH0737272B2 - Winding tape manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a drafting tape, which is tightly wound and whose entire outer peripheral surface is encapsulated by a cover sheet having a tab protruding. The present invention relates to a method for manufacturing a narrow tape having a weak adhesive property.

[Prior Art] Conventionally, a finished product of a weak adhesive tape such as a drafting tape for drawing or a correction tape is generally composed of a raw material of a weak adhesive tape wound around a long tubular body. It is made by cutting the winding tape with a slitter to a small width. Further, after cutting, a small width winding tape to be each final product is packaged.

[Problems to be Solved by the Invention] By the way, when the winding tape itself made of the raw material of the weak adhesive tape wound around the above-mentioned long tubular body is cut with a slitter, an adhesive layer of the tape is formed. Since the adhesive force with the outer skin is weak, there is a defect that the wound weak adhesive tape may be turned up or misaligned on the cut surface.

Further, it is troublesome to wrap each small width winding tape as a final product.

Therefore, the present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and its purpose is to prevent the weak adhesive tape from being turned over when cutting a narrow width and to prevent winding deviation.
Another object of the present invention is to provide a method for manufacturing a small-width winding tape using a weak adhesive tape, which is easy to form and separate from the outer covering.

[Means for Solving Problems] Hereinafter, the structure of the method for manufacturing a winding tape according to the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments.

That is, first, a feeding step of forming a wide overlapping portion (5) on the heat-shrinkable plastic film (2) is performed. That is, both sides (2e, 2e) of the heat-shrinkable plastic film (2) are fed in while folding both sides (2e, 2e) so that both side edges (2d, 2d) of the original (2a) are overlapped. The overlapping portion (5) continuous in the feeding direction is formed.

Subsequently, a tubular continuous covering sheet (3a) is formed in which the knob portion (6) is projected and both ends in the axial direction are opened. That is, the knob portion (6) having a predetermined width in the width direction and continuous in the longitudinal direction is formed from the winding end (2f) of the outermost shell of the plastic film (2) on which the overlapping portion (5) is formed. As is left, the overlapping portion (5) is continuously superposed along the axial direction, and the tubular continuous coating in which the knob portion (6) is projected and both ends in the longitudinal direction are opened. Form the sheet (3a). (See FIG. 3) Next, a long winding tape (which is encapsulated by a tubular covering sheet (3) made of a single-layer plastic film (2) having a protruding knob portion (6) ( 4) is formed. That is, the covering sheet (3) is wrapped in a long tubular body (1) made of the weak adhesive tape and then heat-shrinked so that the entire outer peripheral surface of the tubular body (1) is a knob. A long winding tape (4) encapsulated by a covering sheet (3) consisting of a single-layer plastic film (2) with a protruding portion (6) is formed.

Finally, the long winding tape (4) is cut in the diametrical direction to form a large number of annular winding tapes (4a) having a small width as a final weak adhesive tape product.

[Operation] According to the above configuration, since the long tubular body made of the weak adhesive tape before being cut has the entire outer peripheral surface thereof encapsulated by the cover sheet made of the single-layer plastic film, It does not turn over when it is cut by a slitter, and it does not cause winding misalignment. Further, since the knob portion is projected on the covering sheet and this knob portion is formed on the side of the overlapping portion of the covering sheet,
The covering sheet can be easily peeled off from each small width winding tape by simply applying an external force in the direction of peeling the overlapping portion by pinching the knob portion. In addition, it is not necessary to shrink-wrap each narrow tape as a final weak adhesive tape product.

[Embodiment] Hereinafter, one embodiment shown in the drawings will be described in more detail.

FIG. 1 is a perspective view showing a long winding tape used in the steps of the manufacturing method according to the present invention, and FIG. 2 is a perspective view showing a covering sheet covered with the long winding tape. The drawing is a partial enlarged cross-sectional view showing a state of heavy attachment in the overlapping portion and the shape of the knob portion in a cross section taken along the line I-I in FIG. 2.

A long tubular body 1 before cutting, which is made of an original fabric of a wound weak adhesive tape, is covered on its entire outer peripheral surface by a tubular covering sheet 3 made of a single-layer heat-shrinkable plastic film 2. The long winding tape 4 is formed by heat sealing. A superposed portion 5 is continuously formed in the longitudinal direction on the surface of the covering sheet 3, and the superposed portion 5 is further formed.
Is heat-welded continuously along the axial direction except for the knob portion 6 which has a predetermined width in the width direction from the winding end of the outermost shell and is continuous in the axial direction.

The width of the overlapping portion 5 and the width of the knob portion 6 are appropriately configured.

The long winding tape having the above-described configuration is produced, for example, in the following steps.

That is, in FIG. 4, 7 is a processing machine for folding the raw fabric 2a of the heat-shrinkable film 2 from the state of the sheet 2b to the state of the tubular sheet 2c, and its mechanical structure is a backup roll 8, It comprises a guide plate 9, a folding roller 10 and a pulling roller 11.

First, the heat-shrinkable plastic film 2 is fed with the both sides 2e, 2e folded inward so that the two side edges 2d, 2d of the original 2a are superposed by the folding machine 7, and are fed in the longitudinal direction. A wide overlapping portion 5 is formed.

Subsequently, in the overlapping portion 5, the overlapping portion 5 except for a predetermined width in the width direction from the winding end 2f of the outermost shell (an appropriate width that can be easily picked with a fingertip when peeling off) is formed by an ultrasonic processing machine or the like. The heating and welding machine 12 continuously heats and welds along the longitudinal direction while feeding. Therefore, by this second step, the tubular continuous covering sheet 3a is formed in which the knob portion 6 is formed to project to the side of the overlapping portion 5 that is heat-welded and both ends in the longitudinal direction are open, The covering sheet
3a is wound on the bobbin 13.

The above-described method of attaching the overlapping portions 5 to each other may be a bonding process instead of the heat-welding process, or this may be replaced manually.

After that, the continuous covering sheet 3a formed in the tubular shape
Is cut into a fixed length by a known cutting machine according to the length of the long tubular body 1 before cutting which is made of a weak adhesive tape to be encapsulated, and the individual covering sheets 3 shown in FIG. To form. The length in the longitudinal direction of the cover sheet to be cut is effective if it is cut appropriately longer than the length of the tubular body 1 so that both end surfaces are encapsulated after being heat-shrinked.

Next, as shown in FIG. 5, the covering sheet 3 is expanded into a circular tube shape and covered with a long tubular body 1 made of a weak adhesive tape, as shown in the left diagram of FIG. Then, the tubular body 1b in which the covering sheet 3a is encapsulated is formed. Then, the tubular body 1b
As shown in FIG. 6, it is placed in a heating facility 14 such as a hot air tunnel or a steam tunnel to heat-shrink the covering sheet 3 encapsulated in the tubular body 1b. Then, the entire outer peripheral surface of the tubular body 1b is encapsulated and sealed by a cover sheet 3 made of a single-layer plastic film 2 having a knob portion 6 protruding therefrom. 4 is formed.

Furthermore, the long winding tape 4 obtained as described above
Is hung on the slitter 15 as shown in FIG.
The knob portion 6 is also cut into a predetermined narrow width, and as shown in FIG. 8, a small width as a final weak adhesive tape product which is encapsulated by the cut cover sheet 3 having the knob portion 6 individually. The winding tape 4a is formed. As shown in FIG. 9, the narrow tape 4a can be easily formed into a narrow cover sheet 3 by pulling lightly in the direction of peeling off the welded overlapping portion 5 while pinching the knob portion 6 with a fingertip. Is peeled off.

EFFECTS OF THE INVENTION As described above, according to the present invention, the entire outer peripheral surface of the long tubular body made of the weak adhesive tape is encapsulated by the covering sheet made of the single-layer plastic film. When the product is cut by a slitter and cut into a product, the covering sheet does not "spray" in the cut surface and does not cause winding misalignment. It is possible to easily obtain a product of a small-width winding tape by the weak adhesive tape that has been used, and there is an effect that a defective product does not occur in the manufacturing process.

Further, after covering the outer periphery of a long tubular body formed by winding a weak adhesive tape with a cover sheet having a knob portion by heat shrinkage, this was cut into a small width in the diameter direction to obtain a product. Therefore, there is an effect that it is possible to efficiently mass-produce the small-width winding tape 4a made of the weak adhesive tape covered with the cover sheet having the knob portion.

In addition, since the knob portion rises in the diametrical direction of the outer circumference of the winding tape having a small width due to the heat shrinkage of the cover sheet, the cover sheet can be easily peeled off.

[Brief description of drawings]

FIG. 1 is a perspective view showing a long winding tape used in a manufacturing process according to the present invention, FIG. 2 is a perspective view showing a covering sheet wrapped with the same long winding tape, and FIG. 2 is a partially enlarged cross-sectional view showing the state of heavy attachment and the shape of the knob portion in the overlapping portion in a cross section taken along the line I-I in FIG. 2, and FIG. 4 shows one step of producing the winding tape according to the present invention. Fig. 5 is a front view showing a portion, Fig. 5 is a perspective view showing a state in which a covering sheet is wrapped in the same tubular body, and Fig. 6 is a cylindrical body in which the same covering sheet is wrapped in a heating facility. FIG. 7 is a perspective view showing a state, FIG. 7 is a perspective view showing a step of cutting a long winding tape used in a manufacturing process according to the present invention by slitting it, and FIG. 8 is a cut narrow width winding tape product. FIG. 9 is a perspective view showing a state in which the covering sheet is peeled off from the product of the winding tape of the same width. That. 1 ... Cylinder of weak adhesive tape, 2 (2a) ... Heat-shrinkable plastic film (original), 3 (3a) ... Coating sheet (continuous coating sheet), 4 ... Long winding tape, 4a ... Small width Winding tape, 5 ... overlapping portion, 6 ... knob portion, 7 ... folding processing machine, 12 ... heat welding processing machine, 13 ... bobbin, 14 ... heating equipment,
15 ... Slitter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Matsuoka, Mibu-cho, Shimotsuga-gun, Tochigi Prefecture Toy Town 1-5-16 (72) Koichi Atsuta, Koichi Atsuta 2-23-17, Miyuki-cho, Mibu-cho, Shimotsuga-gun, Tochigi (56) ) References JP-A-49-44896 (JP, A) Actually open 49-44683 (JP, U) Actually open 49-96383 (JP, U)

Claims (1)

[Claims] 1. A feeding step of feeding both side portions of a heat-shrinkable plastic film while folding both sides inwardly so that both side edges of the original sheet overlap each other to form a continuous overlapping portion in the feeding direction. The side edges of the plastic film, which serve as knobs located outside the overlapped portions, are left, and the overlapped portions are continuously stacked along the longitudinal direction, and the knobs are protruded along the axial direction at both ends. And a covering sheet forming step of forming a cylindrical continuous covering sheet, and the covering sheet is formed into a long cylindrical body before cutting which is composed of a tightly wound weak adhesive tape to be wrapped. After being loosely inserted, it is heated and shrunk to form a long winding tape in which the entire outer peripheral surface of the tubular body is encapsulated by a cover sheet made of a single-layer plastic film with a tab protruding. Forming a long tape, and the long tape Winding tape manufacturing method, characterized by comprising a cutting step of the small width winding tape of a number of annular cutting the wound tape diameter direction.