JPS6350110Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for manufacturing tape from a synthetic resin film by a stretching method.

[Conventional technology]

Conventionally, in order to manufacture thin film tapes made of synthetic resins such as polyethylene, vinyl chloride, and nylon, the cylindrical film produced by an inflation film stretching device is usually flattened and then stretched in the longitudinal direction. It was cut into multiple pieces.

[Problem that the invention attempts to solve]

However, with conventional methods, wrinkles tend to occur on the surface of the tape, and since a cylindrical film that has been folded flat is cut, both ends of the film cannot be used, resulting in poor yields.

The present invention solves the problems of the conventional method by smoothly guiding the cylindrical film by a guide member immediately after it comes out of the die and before it hardens, and by automatically cutting the cylindrical film into multiple pieces in the circumferential direction. An object of the present invention is to provide a tape manufacturing apparatus that solves the problem.

[Means for solving problems]

The present invention includes an extruder 1 for extruding a synthetic resin material in a molten state, a die 2 connected to the outlet side of the extruder 1, and having an annular discharge port 2a.
A guide body 3 is provided above the die 2 and expands the diameter of the unsolidified cylindrical film A discharged from the die 2 from the inside, and a guide body 3 is provided for supplying pressurized air into the cylindrical film A immediately after being discharged from the die 2. Feeding means and guide body 3
A large number of blade plates are provided close to the cylindrical film A and face toward the center of the cylindrical film A, and are arranged at required intervals in the circumferential direction so as to be rotatable around a horizontal axis. A cutting device 7 and a pinch roller 6 that pulls the cylindrical film A discharged from the die 2.
When the blade plate is rotated around a horizontal axis, its tip plunges into the unsolidified cylindrical film A, cuts the film A into a plurality of pieces in the circumferential direction, and cuts the film A into a plurality of pieces. It is characterized by being adapted to make tape.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIG. 1, reference numeral 1 denotes an extruder, and a horizontal die 2 is attached to the upper exit side of the extruder.

The synthetic resin material is melt-kneaded in the extruder 1,
A thin cylindrical film A is formed and extruded from an annular discharge hole 2a formed on the upper surface of the die 2.

Reference numeral 3 denotes a cylindrical guide body whose upper part is enlarged in diameter, and its lower end is fixed to the center of the upper surface of the die 2 .

Although not shown in the figure, a large number of air ejection holes are provided on the upper surface of the die 2 between the guide body 3 and the ejection holes 2a.

A disk-shaped tape guide 5 is supported by a support 4 erected at the center of the upper surface of the guide body 3.

A pair of pinch rollers 6, 6 are placed above the tape guide 5 at a desired distance to fold the cylindrical film A flat and pull it upward.
is provided.

A cylindrical film A is placed on the outer side of the upper end of the guide body 3.
A cutting device 7 is provided with a gap through which the cutting device 7 can pass.

As shown in FIG. 2, the cutting device 7 includes a plurality of support stands 8 having a U-shaped planar shape and opening toward the center of the ring 7a on the upper surface of the annular ring 7a.
are arranged at equal intervals on the same circumference,
The outer end of the blade plate 10 is fitted into the opening of each support stand 8 and is pivotally supported with a pin 9. Blade plate 10
A blade 10a is formed at the lower edge of the inner end.

Each blade plate 10 has a length such that its inner edge comes into contact with the upper surface of the guide body 3 when the blade plate 10 rotates inward and becomes horizontal. Therefore, the blade 10 of the blade plate 10
a is the film A pulled upward from the guide body 3;
It bites into.

In order to manufacture a tape using the apparatus of the present invention having the structure described above, first, the blade plate 10 is erected as shown by the imaginary line in FIG. 1, and the die 2 is
The cylindrical film A is sent out from the outlet 2a of the die 2 while blowing out air at a required pressure from the air blowing holes on the upper surface of the die.

Then, the cylindrical film A expands slightly and passes smoothly around the outer periphery of the guide 3 without adhering to it, so it is guided upward along the outer periphery of the tape guide 5 and pinch roller 6, 6 and wind it up onto a winding drum (not shown).

At this time, the cylindrical film A is expanded in diameter without adhering to the guide body 3 by the pressurized air being fed into the inside thereof, and is uniformly pulled in the longitudinal direction over the entire circumference, It is stretched in the circumferential direction and the longitudinal direction.

The cylindrical film A pulled out in a semi-molten state is cooled around the guide body 3 and gradually solidifies, but the area near the cutting device 7 at the upper end of the guide body 3 still remains at a high temperature and is soft. It is in a pre-coagulation state.

When the cylindrical film A before solidification is in a stable state, as shown in FIG. 1, each blade plate 10 is rotated inward by an appropriate means to make it horizontal and bite into the cylindrical film A.

Then, the rising cylindrical film A moves towards the blade 1.
0a, the tape is cut longitudinally into a plurality of strip-shaped tapes a.

When cutting the cylindrical film A, from the cut line,
The pressurized air that has been dragged by the cylindrical film A and moved above the guide body 3 may leak out from the cuts in the cylindrical film A, but this leakage can be absorbed by adjusting the amount of pressurized air ejected. be compensated by doing so.

Each strip-shaped tape a passes through a tape guide 5 and pinch rollers 6, 6, and is wound onto a winding drum (not shown).

FIG. 3 shows another embodiment, in which a cylindrical film A
is cut from the inside.

A recess 11 for housing a blade plate 15 is provided in the center of the upper end surface of the cylindrical guide 3 erected on the die 2, and a shaft hole 12 penetrating vertically is provided in the center of the guide 3. It is perforated.

A circular tube 13 is slidably inserted into the shaft hole 12, and a number of support pieces 13a protruding in the radial direction are fixed to the outer periphery of the upper end of the circular tube 13. The inner end of a rectangular blade plate 15 is pivotally attached to each support piece 13a via a horizontal shaft 14.

The outer end of each blade plate 15 protrudes beyond the outer periphery of the guide body 3, and the blade 15a at the lower edge of the outer end of the blade plate 15 is
It is designed to cut into the cylindrical film A by cutting into it from the inside.

A horizontally long guide hole 15b is bored in the center of each blade plate 15, and both ends of a pin 16 loosely fitted into this guide hole 15b are attached to the guide body so as to sandwich the blade plate 15. It is supported by a pair of projecting pieces 17 erected on the upper surface of 3.

Therefore, when the circular tube 13 is moved downward, the outer end of each blade plate 15 rotates upward about the pin 17, and the blade plate 15 is pulled into a position where it does not come into contact with the cylindrical film A. Ru.

To cut the cylindrical film A in the longitudinal direction, the circular tube 13 is raised upward, the blade plate 15 is rotated outward around the pin 16 to make it horizontal, and the blade plate 15 is cut into the cylindrical film A from the inside.

[Effects of the invention] As explained above, according to the apparatus of the invention, tapes can be manufactured from molten synthetic resin materials.
Can be done consistently and smoothly.

In addition, since the cylindrical film is cut before it solidifies, the cutting resistance is low, and the resulting tape is of good quality without wrinkles, and the blade of the blade plate is less likely to wear out. few.

Note that in the first embodiment in which the blade plates are arranged outside the film, each blade plate is independent, but they are linked as appropriate, and by means such as an air cylinder,
The fact that they can be rotated automatically and simultaneously is that
Needless to say.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view showing a schematic configuration of one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line X-X of FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 3 is a longitudinal sectional front view showing only the main parts of the example. 1 extruder, 2 die, 2a discharge hole, 3 guide body, 4
Post, 5 tape guide, 6 pinch roller, 7 cutting device, 7a ring, 8 support stand, 9 pin, 10 blade plate, 10a blade, 11 recess, 12 shaft hole, 13 circular tube,
13a support piece, 14 shaft, 15 blade plate, 15a blade, 1
5b guide hole, 16 pins, 17 protrusions, A cylindrical film, a tape.

Claims (1)

[Claims for Utility Model Registration] (1) An extruder 1 for extruding a synthetic resin material in a molten state, a die 2 connected to the outlet side of the extruder 1 and having an annular discharge port 2a, A guide body 3 is provided above the die 2 and expands the diameter of the unsolidified cylindrical film A discharged from the die 2 from the inside, and a guide body 3 is provided for supplying pressurized air into the cylindrical film A immediately after being discharged from the die 2. A feeding means and a number of blade plates provided close to the guide body 3 and facing toward the center of the cylindrical film A are rotated about a horizontal axis at required intervals in the circumferential direction. It is equipped with a cutting device 7 which is arranged so as to be wetted, and a pinch roller 6 that pulls the cylindrical film A discharged from the die 2. When the blade plate is rotated around a horizontal axis, the tip thereof is , an apparatus for manufacturing a synthetic resin tape, characterized in that the device plunges into the cylindrical film A before solidification and cuts the film A into a plurality of pieces in the circumferential direction to produce a plurality of tapes. . (2) The composition according to claim (1) of the utility model registration, in which the cutting device 7 is disposed around the outer periphery of the cylindrical film A, and the blade plate is pivoted so as to rotate inward. Manufacturing equipment for resin tape. (3) The synthetic resin tape according to claim 1, wherein the cutting device 7 is attached to the guide body 3 and the blade plate is pivoted so as to rotate outward. manufacturing equipment.