JPH08244109A - Cooling device in lateral stretching machine - Google Patents

Abstract

PURPOSE: To prevent the flutter of a film and to increase a feed speed by providing a nozzle blowing cooling air to the film and the cooling roller opposed to the blowoff orifice of the nozzle to rotate while absorbing the heat of the film in the contact state with the film. CONSTITUTION: In a cooling part, the cooling air from plenum ducts 2 is blown out of upper and lower nozzles 1 to be blown to a film 3 to cool the film. The cooling rollers 8 opposed to the blowoff orifices of the nozzles 1 to rotate while absorbing the heat of the film 3 in the contact state with the film 3 are provided to constitute cooling devices 7 along with the nozzles 1. The cooling devices 7 are arranged so as to be adjacent each other before and behind in such a state that cooling air blowoff directions are made different up and down. The plastic film 3 is simultaneously cooled from both surfaces by cooling air and the cooling rollers 8. In this case, even if cooling air is strongly blown out of the nozzles 1, the plastic film 3 is strongly pressed to the cooling rollers 8 without being fluttered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film heated by hot air blown from a nozzle, which is stretched leftward and rightward so as to be laterally stretched, and then the laterally stretched film is cooled to obtain a predetermined characteristic. The present invention relates to a cooling device in a transverse stretching machine for obtaining a film.

[0002]

2. Description of the Related Art Conventionally, as a transverse stretching machine for pulling a plastic film to the left and right while heating it to obtain a film having predetermined characteristics, there is a device disclosed in Japanese Utility Model Laid-Open No. 62-35817. That is, FIGS. 3 and 4 show an outline of a conventional transverse stretching machine, a film gripping device, and heating,
An example of a cooling device is shown. In the figure, 101 is a clip body, which holds the film 112 and stretches it in the lateral direction. Therefore, as shown in FIG. 3, symmetrical ones are attached to the clip base 102 so as to face left and right and slidable on the rail 103. It is arranged. The clip body 101 is a film 1
It moves on the rail 103 while holding 12 at a predetermined speed.

The clip base 102 moves at a predetermined speed from the entrance to the exit of the transverse stretching machine, and 180 at the exit.
It turns around and returns to the entrance. The rail 103 is a concave guide for holding the film 112 by the clip body 101 and moving the film 112 from the inlet to the outlet while stretching the film 112 in the lateral direction. The clip base 102 slides and moves. .

Reference numeral 104 denotes a plenum duct, which heats the film 112 held by the clip body 101 in the lateral direction, and heats the film 112, and cools the film 112 after being laterally drawn.
12 are provided above and below 12 at appropriate intervals, and the blowing width W _P is larger than the nip width W _N of the film 112. Hot air is blown through a blower and a duct (not shown) attached to the outside. Alternatively, cold air is blown onto the film 112. The plenum duct 104 is provided in a predetermined number across a preheating section, a stretching section, a heat setting section, and a cooling section, which will be described below. Further, 105 is a clip closer, which is a guide disc provided at the entrance of the transverse stretching machine and abutting on a clip lever 101a for gripping the film.

A clip opener 106 is provided at the exit of the transverse stretching machine and is a clip lever 101a for removing the film 112 from the clip body 101.
Is a guide disk that abuts against. Reference numeral 107 denotes a clip tenter, which is a device for changing the draw ratio or draw pattern of the film 112, and has a screw rod 107 in the rail connection portion.
By screwing in a and rotating the screw rod 107a, the left and right clip bodies 101 are expanded or narrowed.

Reference numeral 108 denotes a preheating portion, which is an area where the film 112 held by the clip body 101 is heated by air (hot air) heated outside.
1 is guided by the rail 103 and moves substantially in parallel, and the hot air is heated to a predetermined temperature by the heater section by the blower from the outside and is blown onto the film 112 from the plenum duct 104 to heat the film 112.

Reference numeral 109 denotes a stretching portion, which is an area for laterally stretching the film 112 held by the clip body 101. The clip body 101 runs along a divergent rail 103, and the film 112 is stretched in the lateral direction. Is stretched. Further, like the preheating unit 108, the heating of the film 112 is performed by mounting the plenum duct 1 above and below the film 112.
It is performed by blowing hot air from 04.

Reference numeral 110 denotes a heat setting portion, which is the clip body 10
1 is an area for heat setting (specifically, relieving the internal stress of the stretched film 112) of the film 112 stretched in the transverse direction, which is held by the film 112.
Higher-temperature hot air is blown from the upper and lower plenum ducts 104 from the preheating section 108 and the extending section 109 to heat the film 112.

Reference numeral 111 denotes a cooling portion, which is an area for cooling the film 112 held by the clip body 101, and the plenum duct 10 mounted above and below the film 112.
4, cold air is blown to cool the film 112.
The film 112 is a portion gripped by the clip body 101 or an unstretched portion in the vicinity thereof (this is generally referred to as the ear 1
13) and is reused) and a stretched film (so-called product part). The ear 113 is the clip body 1
The film is thicker than other product film parts, which represents the part that is gripped with 01 and the unstretched part in the vicinity thereof. An intermediate portion 114 separates the high temperature heat setting portion 110 and the low temperature cooling portion 111 to prevent heat transfer.

The film 112, which has been previously stretched in the longitudinal direction at the entrance of the transverse stretching machine, moves at a predetermined speed. The clip levers 10 of the left and right clip bodies 101.
Both ends of the film 112 are gripped by rotating 1a by the clip closer 105. The unstretched film 112 that has been gripped is transferred to the film 112 by the preheating unit 108.
The clip body 101 moves and advances while being heated by the hot air blown from the plenum ducts 104 attached above and below the clip body 101.

The film 112 heated to a predetermined temperature
Is stretched in the lateral direction in the stretching portion 109 by the guide of the rail 103 having a divergent shape. Also in this portion, the film 112 is heated by blowing hot air from the plenum ducts 104 mounted above and below the film 112. The stretched film 112 has a heat setting unit 1
In order to relieve the stretching stress at 10, the film 112 is heated and blown with hot air from the plenum duct 104, which is higher than the temperature of the preheating portion 108 and the stretching portion 109, and the film 112 is gripped by the clip body 101 and set forward. To do. Further, the heat set film 112 is cooled by the cooling air blown from the plenum ducts 104 mounted above and below the film 112 in the cooling unit 111.

The cooled film 112 is released from the clip body 101 by the clip opener 106 provided at the exit of the transverse stretching machine, and the next take-up machine (not shown).
Be carried to. Then, the clip body 101, which has finished gripping the film 112, rotates 180 degrees at the outlet and returns to the inlet, grips a new film 112, and repeats the same operation.

The film 112 is heated, stretched, and heat set by the hot air blown from the plenum duct 104 while being held by the clip body 101 in the transverse stretching machine, and further cooled to have a predetermined film characteristic, and then the clip body. After being released from 101 and cutting the ears 113, it is surface-treated and further wound into a roll to obtain a product.

[0014]

However, in the case of this prior application, although the film 112 is cooled by the cold air blown from the plenum duct 104 in the cooling step,
Since the plastic film 112 has poor heat conduction and has a relatively large heat capacity, it has a low cooling efficiency, the number of nozzles increases correspondingly, the cooling process line becomes long, and the blowing is performed to increase the cooling efficiency. If the amount of cooling air is increased by increasing the strength, the film 112 flutters, so that the feeding speed of the film 112 cannot be increased.

Therefore, an object of the present invention is to send the film in contact with the cooling roller so that the heat of the film is positively absorbed by the cooling roller, and at the same time, cool air is blown to the contact position of the film with the roller. It is an object of the present invention to provide a cooling device in a transverse stretching machine capable of further increasing the cooling efficiency, positively preventing the occurrence of flapping of the film, and significantly increasing the feeding speed of the film.

[0016]

The structure of the present invention for achieving the above-mentioned object is to absorb a heat of a film in a state of being in contact with the film while facing a nozzle for blowing a cooling to the film and facing an outlet of the nozzle. It consists of a cooling roller that rotates. Also, the present invention is directed to a combination of the nozzle and the roller.
It is characterized in that the sets are installed adjacent to each other in the front-rear direction with the directions of the cold air blown from the nozzles being different from each other.

Furthermore, the present invention is characterized in that the nozzle and the roller are provided in the latter half of the heat setting section. Furthermore, the present invention is characterized in that the nozzle and the roller are all provided in a portion excluding the inlet and outlet of the cooling portion.

[0018]

In the case of the cooling device in the transverse stretching machine configured as described above, at the position where the cold air is blown from the nozzle, the film is sent in synchronization with the rotation of the cooling roller while being pressed against the cooling roller by the cold air. To be Therefore, even if the plastic film contains a sufficient amount of heat, the plastic film is cooled at the same time by the cooling air from both sides and the positive cooling action of the cooling roller.

Further, while the plastic film is quickly cooled by the synergistic effect of the cooling air and the simultaneous cooling on both sides by the cooling roller, even if the blowing of cold air from the nozzle is strengthened, the plastic film is only strongly pressed against the cooling roller, It does not flutter, and as a result, the plastic film feed rate can be increased and the plastic film production capacity can be greatly improved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the construction of one embodiment of the present invention will be described with reference to FIGS.
It will be explained by. The plastic film 3 heated by the hot air blown from the nozzles 1 of the upper and lower plenum ducts 2 via the main duct 9 is held by the clip body 4 while being pulled leftward and rightward along the rail 5 to be laterally stretched. Then, cold air from the plenum duct 2 blown out from the nozzles 1 at the upper and lower sides or at least one side is blown to the film 3 stretched laterally in the cooling section, and the film 3
The film 3 having a predetermined characteristic set in advance is obtained by cooling the film. The cooling device 7 for cooling the film 3 is provided with a pair of upper and lower nozzles 1 for spraying the cool air from the plenum duct 2 onto the film 3 from both upper and lower sides thereof at arbitrary intervals in the line direction.

The nozzle 1 for blowing the cool air from the plenum duct 2 onto the film 3 and the film 3 in a state of being in contact with the film 3 so as to face the air outlet while the pair of upper and lower nozzles 1 are installed at arbitrary intervals. A cooling device 7 including a cooling roller 8 that rotates while absorbing the heat is installed. The cooling roller 8 is cooled by a coolant such as water, and can be vertically moved up and down by an air cylinder 10.

In the case of this embodiment, a pair of cooling devices 7 consisting of a nozzle 1 for blowing cold air onto the film 3 and a cooling roller 8 are installed adjacent to each other in the front and rear with the directions of the cold air blown up and down. ing. Next, the operation of this embodiment will be described. In the case of the cooling device 7 in the transverse stretching machine 6 configured as described above, the film 3 is pressed against the cooling roller 8 by the cool air at the position where the cool air is blown from the nozzle 1 and is synchronized with the rotation of the cooling roller 8. Then sent.

Therefore, even if the plastic film 3 contains a sufficient amount of heat, the plastic film 3 is simultaneously cooled by the cool air from both sides and the positive cooling action of the cooling roller 8. Moreover, while the plastic film 3 is quickly cooled by the synergistic effect of simultaneous cooling of both sides by the cool air and the cooling roller 8, even if the cold air blowing from the nozzle 1 is strengthened, the plastic film 3 is strongly pressed against the cooling roller 8. Therefore, there is no fluttering, and as a result, the feed rate of the plastic film 3 can be increased and the production capacity of the plastic film 3 can be greatly improved.

The cooling device may be provided not only in the cooling section but also in the latter half of the heat cut section. Further, the cooling device 7 including the cooling roller 8 and the nozzle 1 may be provided in all of the cooling section except the two points of the inlet and the outlet.

[0025]

As described above, according to the present invention, the film is fed in contact with the cooling roller so that the heat of the film is positively absorbed by the cooling roller, while the cool air is blown to the contact position of the film roller. In addition to further improving the cooling efficiency, it is possible to positively prevent the flapping of the film and significantly increase the film feeding speed.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a conventional example.

FIG. 4 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Nozzle 2 Plenum Duct 3 Film 7 Cooling Device 8 Cooling Roller

Claims (4)

[Claims] 1. A nozzle for blowing cooling to a film,
A cooling device in a transverse stretching machine, which comprises a cooling roller that rotates while absorbing heat of the film while being in contact with the film facing the blow-out port of the nozzle. 2. The transverse stretching machine according to claim 1, wherein one set of the nozzle and the roller is installed adjacent to each other in the front-rear direction with the directions of the cold air blown from the nozzle being vertically different. Cooling system in. 3. The cooling device in a transverse stretching machine according to claim 2, wherein the nozzle and the roller are provided in the latter half of the heat setting section. 4. The nozzle and the roller are all provided in a portion of the cooling portion excluding an inlet / outlet port.
And a cooling device in the transverse stretching machine according to claim 3.