JP3366349B2 - Air supply device for resin film manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a resin film manufacturing apparatus.
The present invention relates to an air supply device.

[0002]

2. Description of the Related Art A resin film manufacturing apparatus using an air supply device cools a film-like molten resin extruded from a die by pressing it against the cylindrical surface of a cooling roll by the force of air supplied from the air supply device. This is an apparatus for transferring the surface shape of the roll to the surface of the molten resin and cooling and solidifying the molten resin to form a resin film.
A conventional air supply device for this purpose is shown in FIG. The air supply device is arranged in the case 50, a case 50 in the shape of a flat tubular container, internal ducts 52 arranged inside the case 50 and penetrating the covers at both ends of the case 50 and fixed thereto, respectively. The inner space of the punching plate 54 is divided into two chambers, an upstream chamber on the left side of the drawing and a downstream chamber on the right side of the drawing. The punching plate 54 has a large number of small holes 54a.
Are formed through. As a result, the two spaces on the left and right in the figure communicate with each other through these small holes 54a.
Each open end of the inner duct 52 on the cover side is connected to two connection pipes (not shown). Case 5
At 0, an air supply slit 50a is formed in the right side portion of the outer peripheral surface of the drawing in the drawing, over the entire width in the axial direction. The internal duct 52 has an air supply slit 50a.
A slit-shaped air outflow opening 52a is formed in the opposite direction (leftward in the figure). When air is supplied to the internal duct 52 from an air source (not shown), the air flows from the air outlet opening 52a into the upstream chamber on the left side of the drawing in the direction opposite to the direction in which the air supply slit 50a is located. After being discharged, it is divided into two directions, an upper direction and a lower direction in the drawing, passes through a semi-cylindrical passage, and flows into the downstream chamber on the right side in the drawing while being rectified by passing through a number of small holes 54a of the punching plate 54. And air supply slit 50a
Is blown out in a belt shape from the film-shaped molten resin 56. Thereby, the molten resin 56 can be pressed against the cooling roll 58 and can be cooled and solidified to form a resin film.

[0003]

However, in the conventional air supply device as described above, since the wind speed of the air supplied from the air blowing slit is not uniform, the molten resin may not sufficiently adhere to the cooling roll. As a result, the surface shape (usually a mirror surface) of the cooling roll cannot be completely transferred to the resin film, and the molten resin surface is stretched thinner in the portion where the wind speed is higher, so There is a problem that a bad resin film may be formed. The present invention aims to solve such problems.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems by further rectifying the air flow rectified by passing it through a punching plate and further rectifying it by passing it through a corrugated plate member. That is, the resin film of the present invention
An air supply device of a rum manufacturing apparatus includes a cylindrical container-like case (16) having an air blowing slit (16a) opening in the width direction, and an air outflow opening (20) housed in the case.
a) formed inside duct (20) and case (1)
A case having a punching plate (22) with a large number of small holes (22a) for partitioning 6) into a downstream chamber on the side of the air blowing slit (16a) and an upstream chamber on the side of the internal duct (20). 16) In the downstream chamber,
A corrugated plate member (24) having a corrugated longitudinal section is provided in parallel with the punching plate (22), and the corrugated plate member (24) is an air blowing slipper of the case (16).
(16a) is arranged so that the air blowing direction points to its center.
The punching plate (2) is arranged so as to undulate in the axial direction of the cooling roll (42) in which the placement position is set.
The air rectified primarily by passing through the large number of small holes (22a) of 2) flows into the downstream chamber and further passes along the wave arranged in the longitudinal direction of the corrugated plate member (24). Secondary rectification was made. In addition, two baffle plates (26) fixed so as to face each other are provided in the tubular portion of the downstream chamber of the case (16),
The corrugated plate member (24) may be fixed to both baffle plates (26). The reference numerals in parentheses indicate the corresponding members of the embodiment.

The air supplied to the internal duct of the air supply device of the resin film manufacturing apparatus flows out from the air outflow opening in the case in the direction opposite to the final blowing direction. In this state, there is a large variation in the wind speed of the air flowing through the air outflow opening. The air that has flowed out from the air outflow opening is guided to the punching plate while being gradually turned in the blowing direction. The air that is primarily rectified by passing through a large number of small holes in the punching plate has a relatively small variation in wind speed. Then, by being guided to the corrugated plate member and further secondary rectified, the air having a smaller variation in the wind speed over the entire length of the slit is blown to the outside from the air blowing slit. For example, air is blown from the air blowing slit onto the surface of the molten resin. As a result, the molten resin is cooled by the blown air at a uniform cooling rate, and a resin film having good surface accuracy and thickness accuracy can be manufactured.

[0006]

EXAMPLES FIGS. 1 to 4 show the resin film manufacturing apparatus of the present invention.
The Example of an air supply apparatus is shown. The die 40 of the extruder is
An extrusion port 40a that opens downward in FIG. 1 is formed. A cooling roll 42 is arranged at a position lower than the position where the die 40 is arranged in the drawing. The cooling roll 42 can rotate counterclockwise in the figure by being driven by a motor (not shown). Cooling roll 4
The dancer roll 44 is arranged on the right side of FIG. The dancer roll 44 is supported by a fixing portion (not shown) while being acted by an upward force in the drawing by a spring mechanism (not shown), and thereby a predetermined tension can be applied to the resin film 30 described later. is there. The case 16 is arranged on the left side of the cooling roll 42 in FIG. 1. As shown in FIGS. 2 and 3, the case 16 has a flat tubular container shape. The case 16 is formed with an air blowing slit 16a over the entire axial length thereof. The case 16 has a slit 16 for blowing air.
The arrangement position of the cooling roll 42 is set so that the air blowing direction of a indicates the center of the cooling roll 42. As shown in FIG. 3, a punching plate 22 is attached to the case 16 so as to partition the case 16 into an upstream chamber on the left side and a downstream chamber on the right side in the figure. A large number of small holes 22a are formed through the punching plate 22. Thereby, the upstream chamber and the downstream chamber are in communication with each other. Case 16
A connecting pipe (air inflow part) 14 is attached to each of both ends of the upstream side chamber in the longitudinal direction. The connection pipes 14 are respectively connected to the air source 10 via the pipes 12, and the upstream chamber-side ends of the connection pipes 14 are connected to the ends of the internal ducts 20, respectively. A slit-shaped air outlet 20a is formed in the inner duct 20 over the entire width thereof. The arrangement of the air outflow opening 20a is set so that the direction of the opening is opposite to the direction of the opening of the air blowing slit 16a of the case 16. The configuration so far is the same as the conventional one.

In the case 16, a corrugated plate member 24 and two baffle plates 26 are arranged in a chamber on the downstream side of the case 16.
The baffle plates 26 are fixed to the inner wall surface of the cylinder of the case 16 so as to face each other. Corrugated plate member 24
Has a corrugated longitudinal section,
It is attached to both baffle plates 26 so as to be parallel to the punching plate 22. Case 16, internal duct 2
0, the punching plate 22, the corrugated plate member 24, and the like constitute an air supply device 32. Air can be supplied from the air source 10 to the internal duct 20 via the connection pipe 14 or the like. As a result, air is made to flow into the case 16 from the air outlet opening 20a of the internal duct 20, and the flow direction is sequentially changed by the punching plate 22, the corrugated plate member 24, etc. as shown by the arrows in FIG. The air 34 can be blown to the outside through the air blowing slit 16a. That is, the air supply device 32 blows the air 34 rectified at a uniform blowing speed onto the film-like molten resin that is extruded from the die 40 and hangs down on the cylindrical surface of the cooling roll 42, as described later, and the force of the air 34 is applied. It is possible to bring the molten resin into close contact with the cooling roll 42 and to cool the molten resin.

Next, the operation of this embodiment will be described. The film-shaped molten resin 28 extruded from the die 40 is cooled while the cooling roll 42 of the resin film manufacturing apparatus is rotated counterclockwise in FIG. 1 by being driven by a motor (not shown). The roll 34 hangs down toward the cylindrical surface of the roll 42, and in this state, the air 34 is blown from the air supply device 32 toward the molten resin 28 through the air source 10. At this time, the air supplied from the air source 10 to the internal duct 20 through the pipe 12 and the connecting pipe 14 is introduced into the upstream side chamber of the case 16 from the air outlet opening 20a of the internal duct 20 to the upper left in FIG. It flows out in the direction opposite to the final blowing direction), and is guided to the punching plate 22 while gradually changing the flow direction along the outer periphery of the internal duct 20 in the diagonally lower right direction in FIG. 3 (the same direction as the blowing direction). . As shown in FIG. 4, the air that is primarily rectified by passing through the large number of small holes 22a of the punching plate 22 flows into the downstream side chamber, and is further guided to the corrugated plate member 24 and the baffle plate 26, respectively, by arrows. By being secondarily rectified through the path shown, the air is blown out as air 34 from the air blowing slit 16a in a state in which the blowing speed is adjusted to be uniform over the entire length of the slit.
That is, the strip-shaped air 34 rectified to have a uniform blowing speed is blown toward the center of the cooling roll 42. As a result, the molten resin 28 is pressed against the cylindrical surface of the cooling roll 42 with a uniform force over the entire length, and is cooled and solidified by the cooling roll 42 and the air 34 to form the resin film 30. The resin film 30 has a cooling roll 42.
Is sequentially sent to the dancer roll 44 side as it rotates, is separated from the cylindrical surface of the cooling roll 42, and is wound by a winder (not shown) while the tension at the time of winding is adjusted by the dancer roll 44. It will be.

(Test result) The total length of the case 16 is 800 mm, and the resin film is manufactured.
The air supply device of the device has a capacity of 40 m ³ / min, an air pressure of 2450 mmAq, and a maximum rotation speed of 3500 rp.
A comparative test between the conventional one shown in FIG. 5 and the one according to the present invention was carried out using m. ± 4% for conventional type
In the case of the present invention, an air flow having a uniform wind speed of about ± 1% was obtained, although the wind speed varied to some extent. This resin film manufacturing apparatus according to the present invention
The air supply device of P. P. When it was attached to a (polypropylene) resin film manufacturing apparatus and a resin film molding test was conducted, the adhesion of the molten resin to the cooling roll 42 was improved more than before, and the surface accuracy was better than before, and the thickness accuracy was also better than before. It was confirmed that an excellent resin film could be produced.

Although the corrugated plate member 24 is attached to the case 16 via the baffle plate 26 in the above description of the embodiment, the corrugated plate member 24 may be formed with an attaching portion to form a corrugated plate member. The plate member may be directly attached to the case 16.

[0011]

As described above, the resin film of the present invention is used.
According to the air supply device of the rum manufacturing apparatus, it is possible to blow out an air flow having a uniform wind speed over the entire length of the air outlet. When the air supply device of the resin film manufacturing apparatus of the present invention is used in the resin film manufacturing apparatus, for example, the molten resin can be cooled uniformly. Therefore, a resin film having excellent surface accuracy and thickness accuracy can be manufactured.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view of an air supply device of the resin film manufacturing apparatus .

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a diagram illustrating a flow of air in a case.

FIG. 5 is a view showing an air supply device of a conventional resin film manufacturing apparatus .

[Explanation of symbols]

10 air source 14 Connection pipe (air inflow part) 16 cases 16a Air blowing slit 20 internal duct 20a Air outflow opening 22 Punching plate 22a small hole 24 Corrugated plate member 26 baffle

Claims (2)

(57) [Claims] 1. A case (16) in the shape of a tubular container, in which an air-blowing slit (16a) opening in the width direction is formed.
An internal duct (20) housed therein and having an air outflow opening (20a) formed therein; and a case (16) having a downstream side chamber on the air blowout slit (16a) side and an internal duct (2).
A resin fill having a punching plate (22) with a large number of small holes (22a) for partitioning the upstream chamber on the (0) side
In the air supply device of the machine, a corrugated plate member (24) having a corrugated longitudinal section is provided in the downstream chamber of the case (16) in parallel with the punching plate (22) to form a corrugated plate. Material (24)
Is the air in the air blow slit (16a) of the case (16)
The placement position is set so that the air blowing direction points to its center.
The air that is arranged so as to undulate in the axial direction of the cooling roll (42) that has been rectified and that is primarily rectified by passing through the large number of small holes (22a) of the punching plate (22) flows into the downstream side chamber, and A resin film characterized in that secondary rectification is performed by passing along a wave arranged in the longitudinal direction of the corrugated plate member (24).
Air supply device for manufacturing equipment . 2. Two baffle plates (2) fixed to the tubular portion of the downstream chamber of the case (16) so as to face each other.
6. The resin according to claim 1, further comprising: 6), wherein the corrugated plate member (24) is fixed to both baffle plates (26).
Air supply device for film manufacturing equipment .