JPH09124199A - Film winding method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deviation and wrinkles from being produced in winding by processing the end in the width direction of a film by means of an emboss ring in which a plurality of embossed protrusions are spirally arranged in plural lines, and the angle of the arranging direction and the ring is in the specified range. SOLUTION: An emboss ring 3 is provided in the position before a winding device in the film traveling direction and in the position facing the end in the width direction of a film, and irregularities are formed on the end of the film in traveling by embossed protrusions 4. The embossed protrusions 4 are spirally arranged on the outer peripheral surface of the emboss ring 3 in plural lines, and the angle θ formed by the arranging direction of the embossed protrusions 4 and the ring circumferential-direction is set in the range of 20 to 70 deg.. Preferably, the angle 6 is set in the range of 40 to 50 deg.. When the angle is not more than 20 deg., removing performance for drawing air is insufficient, and cockles are to be easily generated. When the angle θ is more than 70 deg., the wrinkle extending effect in winding is insufficient, similarly, wrinkles are to be easily produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding method and device for manufacturing a plastic film.

[0002]

2. Description of the Related Art Various film molded products made of a thermoplastic resin as a raw material are known. Among them, polyester film, especially polyethylene terephthalate film,
It has excellent mechanical properties, electrical properties, chemical resistance, dimensional stability, etc., so it is used for magnetic tapes, capacitors, packaging materials, plate making, electrical insulation materials, beverage can laminating, photographic films. It is used as a base material in various fields such as applications. The thermoplastic resin raw material is discharged from the die by, for example, a melt extrusion method, and cooled and solidified by a drum or the like. Then, it is biaxially stretched at an appropriate temperature and a stretching ratio, and wound into a roll by a winder. At the time of winding, the end surface of the film as an intermediate product may be displaced or the film may be wrinkled due to the air taken in, which may cause a winding defect.

As a countermeasure against this misalignment, there has been known a method of embossing the end of the film with an embossing ring having a large number of projections to form irregularities on the film and winding the film. However, in the conventional embossed ring shape, since the embossed protrusions are arranged in the ring circumferential direction, for example, the air entrained when the film is wound into a roll as an intermediate product is not sufficiently removed (cannot be removed). ), Therefore, defects such as wrinkles on the film often occurred.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to reduce the entrainment of air without causing the problem of misalignment when the film is wound into a roll as an intermediate product. It is an object of the present invention to provide a stable winding method and device in which wrinkle defects do not occur.

[0005]

Means for Solving the Problems The inventors of the present invention have made earnest studies in view of the above situation, and as a result, if the film end portion is embossed with a specially shaped embossing ring as specified in the present invention, The present invention has been completed by finding a winding method in which wrinkle defects and the like are drastically reduced without causing a problem of deviation of an intermediate product.

That is, the film winding method of the present invention is as follows:
When the film is wound into a roll, the widthwise end of the film is (A) embossed protrusions are arranged in a plurality of spiral rows on the outer circumference of the ring, and (B) the embossed protrusions are arranged in the ring circumferential direction. The angle θ is embossed with an embossing ring satisfying 20 ≦ θ ≦ 70 (degrees) to form irregularities on the film.

Further, the film winding device according to the present invention is an embossing ring provided at a position corresponding to the widthwise end of the film wound in a roll shape,
(A) A plurality of embossed protrusions are arranged in a spiral shape on the outer circumference of the ring, and (B) an embossed ring whose angle θ formed by the arrangement direction of the embossed protrusions and the ring circumferential direction satisfies 20 ≦ θ ≦ 70 (degrees). It is characterized by having.

In the above, the width (embossing width) W of the embossing process (processing) to the film end portion by the embossing protrusion
From the standpoints of preventing the roll-shaped film intermediate product to be wound from slipping off and eliminating the entrained air, 5 ≦ W ≦
It is preferably in the range of 15 (mm).

The plastic film to which the present invention is applied is not particularly limited, but the present invention is suitable for a polyester film, particularly a polyethylene terephthalate film. The method for producing the film is not particularly limited, but it is particularly effective for a biaxially oriented relatively thin film.

In such a film winding method and device, the embossing ring is contact-rotated as the film runs, and the film is embossed by the embossing protrusions arranged on the embossing ring. It Since the embossing protrusions are arranged in a spiral manner on the embossing ring in a plurality of rows, the embossing of the film end portion by the embossing projections causes the uneven row to be in the above-mentioned angle range (2) with respect to the longitudinal direction of the film (the film running direction).
It becomes a processing mark inclined by the same amount as (0 to 70 degrees). Since this film is wound into a roll, in this film roll, the concavo-convex rows formed by the embossing are arranged in a spiral shape.

Due to the presence of the concave-convex row at the end of the film, the concave-convex rows are in mesh with each other between the film winding layers, and the deviation in the width direction of the film, that is, the deviation at the end surface of the film wound into a roll shape. Is prevented from occurring.

Since the concave-convex rows are arranged in a spiral shape, the air that is about to be caught between the concave-convex rows is automatically discharged to the outside in the film width direction along the spiral shape. Therefore, the entrapment of air into the film take-up roll is suppressed, and the occurrence of misalignment and wrinkles due to a large amount of entrapped air is prevented.

Further, in the process in which the air is spirally released to the outside in the width direction of the film, the air does not immediately escape to the side, but to the escape direction to the side from the film to some extent (from the uneven projection row). ) You will run away while receiving resistance. Since this resistance acts on the film in the direction in which the film is widened in the width direction, a natural wrinkle-rolling effect can be obtained on the wound film.

Therefore, the film is wound without causing a shift and without generating wrinkles, and is naturally subjected to a forced wrinkle stretching action.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 to 4
1 illustrates a film winding device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a plastic film which is continuously run, and the film 1 is wound into a roll 2 by a winding device to be an intermediate product form (intermediate product roll).

An embossing ring 3 is provided in the winding device or at a position before the winding device in the film running direction and at a position corresponding to the widthwise end portions (both ends or one end) of the film 1. The embossing ring 3 has a large number of embossing protrusions 4 on its outer peripheral surface. The running film 1 is nipped between the embossing protrusions 4 and the rubber rolls 5 arranged to face each other, and the embossing protrusions 4 are attached to the ends of the film by the embossing protrusions 4. Form irregularities.

As shown in FIGS. 2 and 4, the embossed protrusions 4 are arranged in a plurality of spiral rows on the outer peripheral surface of the embossed ring 3. An angle θ formed by the arrangement direction of the embossed protrusions 4 and the ring circumferential direction is set in a range of 20 degrees or more and 70 degrees or less. This angle θ is preferably 40
≦ θ ≦ 50 (degrees). When θ <20 (degrees), the exclusion of the entrained air is not sufficient, and the film is likely to be wrinkled. Further, if θ> 70 (degrees), the wrinkle-stretching effect at the time of winding is not sufficient, and similarly wrinkles easily occur.

Further, in this embodiment, since the embossed protrusions 4 are arranged up to the widthwise end of the embossed ring 3, the embossed width W of the embossed protrusions 4 on the film 1 is increased.
And the width of the embossing ring 3 are substantially equal. The emboss width W is preferably set in a range of 5 mm or more and 15 mm or less from the viewpoint of preventing the film 1 from shifting and eliminating the entrained air.

The material of the embossing ring 3 is not particularly limited, but SCM steel, for example, is desirable in order to ensure the workability while imparting excellent durability and wear resistance to the embossing protrusion 4. Further, the interval between the embossed protrusion rows arranged in a spiral shape is appropriately 3 mm to 8 mm, and the distance between the protrusions 4 provided in the row shape is 0.5 mm.
About 3 mm is desirable.

[0020]

The present invention will be described below in detail with reference to examples. The air entrapment rate, which is one of the evaluation parameters of the roll-shaped intermediate product (intermediate product roll), was expressed as the ratio of the cross-sectional area occupied by air to the cross-sectional area occupied by the intermediate product roll. The conditions and results in each Example and Comparative Example are shown together in Table 1.

Example 1 A biaxially oriented polyester film having a thickness of 15 μm was used, and the spiral angle θ of the embossed projection row was θ = 45 degrees and the embossed width W.
= 10 mm of embossing ring was used to emboss the edge of the film to form irregularities on the film, and the film was wound at a winding tension of a winder of 10 kg / m and a winding surface pressure of 25 kg / m. There is no problem of deviation in the intermediate product, and the air entrapment rate is 5.
It was as low as 0%. The intermediate product had no wrinkles, and the winding shape was good.

Example 2 Winding was carried out under the same conditions as in Example 1 except that the embossed projection row having a spiral angle θ = 20 degrees was used. No deviation occurred in the intermediate product, but the air entrapment ratio was 6.5%, which was slightly higher than that in Example 1. The wrinkle of the intermediate product is
Although it occurred very slightly, it disappeared over time.

Comparative Examples 1-1 to 1-3 A polyester film having a thickness of 15 μm was wound under the same conditions as in Example 1 except that an embossing ring having a spiral angle θ of the embossing protrusion row of 10 degrees was used. Although the intermediate product did not shift, the air entrapment rate was considerably high at 10%, and a wrinkle defect occurred from the core of the intermediate product to a winding length of 3000 m (Comparative Example 1-1). To lower the air trapping rate,
Although the winding tension was increased to 12 kg / m, the width shrinkage of the film increased and vertical wrinkles occurred (Comparative Example 1-2). On the other hand, when the winding surface pressure was increased to 30 kg / m, the charge level of the intermediate product roll was increased, and the uneven charge defect was generated (Comparative Example 1-3).

Comparative Example 2 Winding was carried out under the same conditions as in Example 1 except that an embossing ring having a spiral angle θ of the embossed projection row of 20 degrees and an embossing width W of 20 mm was used. Although there was no deviation in the intermediate product, the air entrapment rate was 8%, which was slightly higher than in Example 2, and wrinkle defects occurred up to 700 m from the core of the intermediate product. When the winding tension and the winding surface pressure were increased, the same defects as in Comparative Example 1 occurred.

Comparative Example 3 When winding was performed under the same conditions as in Example 1 except that an embossing ring with a spiral angle θ of the embossed protrusion row θ = 20 degrees and an embossing width W = 3 mm was used, winding deviation of the intermediate product occurred. did. That is, in Comparative Examples 2 and 3, when the spiral angle θ is in the vicinity of the lower limit of the range of the present invention, when the emboss width W is set to an appropriate width, good results are obtained as in Example 2, but the emboss width W Indicates that if the value is out of the preferable range, it becomes difficult to suppress the occurrence of defects.

[0026]

[Table 1]

[0027]

As described above, by using the embossing ring according to the present invention, the air entrapment ratio of the intermediate product roll can be suppressed to a low level, and the winding deviation can be prevented. Therefore, core loss and product inspection loss due to wrinkle defects are reduced, and productivity can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a film winding device according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic development view of an outer peripheral surface of the embossing ring of FIG.

FIG. 3 is an enlarged side view showing the embossing ring of FIG. 1 in more detail.

FIG. 4 is an enlarged partial plan view of the outer peripheral surface of the embossing ring of FIG.

[Explanation of symbols]

 1 Film 2 Intermediate product roll 3 Embossing ring 4 Embossing protrusion 5 Rubber roll

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29K 67:00

Claims (4)

[Claims] 1. When winding a film into a roll,
(A) Embossed protrusions are arrayed in a plurality of spiral rows on the outer circumference of the ring at the end portion in the width direction of the film, and (B) the angle θ formed by the arrangement direction of the embossed protrusions and the ring circumferential direction is 20 ≦ θ ≦ 70. A film winding method, characterized in that embossing is performed with an embossing ring satisfying (degree) to form irregularities on the film. 2. The film winding method according to claim 1, wherein an emboss width W of the embossed protrusion on the film is in a range of 5 ≦ W ≦ 15 (mm). 3. The method of winding a film according to claim 1, wherein the film is a polyester film. 4. An embossing ring provided at a position corresponding to a widthwise end portion of a film wound into a roll, wherein (A) embossing projections are arranged in a plurality of spiral rows on the outer circumference of the ring, and (B). A film winding device having an embossing ring whose angle θ formed by the arrangement direction of the embossing projections and the ring circumferential direction satisfies 20 ≦ θ ≦ 70 (degrees).