JPH0627355Y2 - Plastic film punching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a plastic film punching device for penetrating a large number of small holes such as ventilation holes in a plastic film.

(Prior Art) Conventionally, for the production of perforated plastic films having a large number of through holes on the whole surface or a part thereof for use in, for example, an air-permeable pack of vegetables or fruits, or an air-permeable coating of the surface of a nursery Uses a drilling device as shown in FIG.

In this conventional device, a plastic film A wound in a roll shape is wound around a receiving roll 3 from a feeding device 1 via guide rolls 2 and 2, and is wound up by a winding device 5, and then on the receiving roll 3. The needle-like projections 4a and 4b protruding on the peripheral surface of the heating roll 4 are rotatably brought into contact with the plastic film A at the feeding speed, and the needle-like projection 4a partially heats and melts the plastic film A. .

(Problems to be solved by the invention) In the conventional device as described above, since the receiving roll is made of rubber having heat resistance, the receiving roll is severely damaged, and the receiving roll and the heating roll are It is troublesome to adjust the contact pressure, and in order to adjust the diameter of the hole to be opened, it is necessary to change to a heating roll with a different tip diameter of the needle-like protrusion, which requires a lot of labor and time. There was a problem.

The present invention is intended to solve the above-mentioned conventional problems.

(Means for Solving Problems) A feature of the present invention for solving the above-described conventional problems is that a heating roll having a large number of needle-like protrusions protruding from the outer periphery thereof and being rotationally driven, and the heating roll. And a film feed mechanism for transferring the plastic film along the outer circumference of the receiving roll, and bringing the needle-like protrusions of the heating roll into contact with the plastic film on the receiving roll. Thus, in the plastic film punching device for heating and melting the film to open a large number of through holes, the receiving roll is constructed by planting heat-resistant fibers in a cylindrical brush shape on the outer periphery of the rod-shaped central shaft portion. There is something I did.

(Operation) In this punching device, the plastic film to be processed is continuously moved along the outer periphery of the receiving roll by the film feeding mechanism, and the heating roll rotated at the speed is brought into contact with the receiving roll. As a result, the heated needle-shaped protrusions touch the plastic film, the portion is heated and melted, and a large number of through holes are opened.

In addition, the needle-like protrusion penetrates the plastic film, and its tip is inserted between the heat-resistant fibers of the receiving roll, and the length of the insertion is increased, that is, the receiving roll shaft is brought closer to the heating roll shaft. Thereby, the diameter of the hole formed in the film can be increased.

Furthermore, when a metal material with high thermal conductivity is used for the heat-resistant fiber of the receiving roll, the holes that are heated and melted and opened are instantly cooled, the edges of the holes are welded, and a perforated film with high tensile strength is obtained. To be

(Embodiment) Next, an example of an embodiment of the present invention will be described with reference to FIGS.

In the figure, 10 is a heating roll and 11 is a receiving roll. The heating roll 10 is
The rotatably mounted central shaft portion 13 and the needle segment 14 mounted on the outer side of the central shaft portion 13.
Is a cylindrical portion 14 that is detachably fitted to the outside of the central shaft portion 13.
A large number of needle-like projections 14b are radially provided on the outer peripheral surface of a. The central shaft portion 13 of the heating roll 10 is
The one end side 13a is borne by the device main body 12 via a bearing, and the pulley 15 is fixed to the protruding end of the device main body 12 so that the rotation of the motor 16 is transmitted via the belt 17. The central shaft portion 13 has a bent portion 18 near the above-mentioned bearing position, and the other end side is supported by four upper and lower support rolls 19a, 19a, 19b, 19b. This support roll is the upper one (19
a, 19a) is attached to the opening / closing cover 20, and the lower one (19b, 19b) is attached to the apparatus main body 12. By opening the opening / closing cover 20 upward, the other end side 13b of the central shaft portion 13 is formed. Can be rotated upward around the bent portion 18.

Further, in the central portion of the central shaft portion 13, the electric heating motor 21
Are housed and heated by this.

For the needle segment 14, a plurality of kinds of needle-like protrusions 14b on the outer periphery having different densities and tip thicknesses are prepared, and a plurality of pieces of a constant length are prepared for each kind, and the type of drilling and The processing width can be changed. The needle segments 14 are detachably attached to the central shaft portion 13 at required positions by using the stoppers 22 and 22.

The periphery except the lower side of the heating roll 10 is covered with the fixed cover 23 and the opening / closing cover 20. Fixed cover 23
Is fixed to the apparatus main body 12 so as to cover the back surface side of the heating roll 10, and the upper surface side and the entire surface side are covered with the opening / closing cover 20. The opening / closing cover 20 is supported by a pivot 24 that is horizontally mounted on the apparatus main body 12 via a pivot arm 25, and can be pivoted upward by operating a handle 26.

A radiation heater 27 made of a ceramic heater is attached to the inner surface of the opening / closing cover 20 to heat the rotating needle-like protrusion 14b from the outside. The radiant heater 27 has a reflector 2 whose upper side is made of aluminum.
It is surrounded by 8.

The receiving roll 11 is located below the heating roll 11. The receiving roll 11 is formed with a large number of heat-resistant fibers 11b radially with respect to the central shaft portion 11a, and is formed into a cylindrical brush shape as a whole. .

As the heat-resistant fiber 11b, for example, animal hair such as pig hair having high elasticity, glass fiber and metal fiber are mixed and used.

The receiving roll 11 has arms 30, 3 at both ends of the central shaft 11a.
It is rotatably supported at the tip of 0. Both arms 3
0 and 30 are fixed to a swing operation shaft 31, and the shaft 31 is rotatably supported by the apparatus main body 12. The operation arm 3 fixed to the protruding end of the shaft 31
By rotating 2 with an actuator 33 composed of an air cylinder, the arms 30, 30 are rotated upward, and the receiving roll 11 is moved in parallel to the side in contact with the heating roll 10. Also, the receiving roll 11
The upper stop position during the parallel movement of is adjusted by moving the adjustment bolt 34 that comes into contact with the rear surface of the operation arm 32.

A film feeding device 40 and a film winding device 41 are provided below the front and rear portions of both rolls 10 and 11 thus installed.
A film feeding mechanism consisting of The film feeding device 40 rotatably supports the film roll 42 to be punched in the unwinding direction, and the film winding device 41 drives the removable winding shaft 43 to rotate by a motor. The film A after perforating is wound on this.

In addition, the film roll 44 wound around the winding shaft 43
A roller 46 for detecting the feed speed, which is fixed to the shaft of the encoder 45, is pressed against the outer peripheral surface of the film roll 44.
The rotation speed of the heating roll 10 is controlled by detecting the film feeding speed that changes according to the change in the outer diameter of the film.

The plastic film punching device configured as described above is used for the film roll 4 mounted on the film feeding device 40.
The film A is pulled out from the film 2, set on the receiving roll 11 that has been moved downward, and set so as to be wound by the film winding device 41. While the heating roll 10 is being rotated, the electric heater 21 inside thereof is The external heater 27 is energized to wait until the needle-shaped protrusion 14b reaches the processing temperature. After that, while driving the film winding device 41, the receiving roll 11 is raised to bring the peripheral surface into contact with the heating roll 10. As a result, in the film A, the needle-like projections 14b sequentially contact with each other on the outer circumference of the receiving roll 11, and the contact portions are heated and melted to form a large number of through holes.

(Effect of the Invention) As described above, in the plastic film punching device of the present invention, by using heat-resistant fibers planted in the shape of a cylindrical brush in the receiving roll, the receiving roll contacts the needle-like protrusions of the heating roll. Then, the tips of the needle-shaped protrusions push off the heat-resistant fiber of the receiving roll and are inserted between them,
Since the receiving roll is not damaged, the distance between the heating roll and the receiving roll can be easily adjusted, and the diameter of the hole to be opened can be adjusted by reducing the distance.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the device of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a right side view thereof, and FIG. 4 is A in FIG.
Fig. 5 is a sectional view taken along line -A, Fig. 5 is a sectional view taken along line BB, Fig. 6 is a partial vertical sectional front view of a heating roll portion, and Fig. 7 is a sectional view showing the outline of the mechanism of a conventional apparatus. 10 ... Heating roll, 11 ... Receiving roll, 12 ... Device main body, 13 ... Central shaft part, 14 ... Needle segment, 14a ... Cylindrical part, 14b ... Needle-like projection, 18 ... Bent part , 19a ... Support roll, 20 ... Open / close cover, 21 ... Electric heater, 23 ... Fixed cover, 27 ... Radiant heater, 28 ... Reflector, 30 ... Arm, 31 ... Swing operation Shaft, 32 ... Operation arm, 33 ... Actuator, 34 ... Adjust bolt, 40 ... Film feeding device, 41 ... Film winding device, 42, 44 ... Film roll, 43 ... Winding shaft, 45 …… Encoder, 46 …… Roller.

Claims (1)

[Scope of utility model registration request] 1. A heating roll having a large number of needle-shaped projections protruding from its outer periphery and being driven to rotate, a receiving roll provided in parallel with the heating roll, and a plastic film along the outer periphery of the receiving roll. With a film feeding mechanism for transferring,
In the plastic film punching device for opening a large number of through holes by heating and melting the film by bringing the needle-like projections of the heating roll into contact with the plastic film on the receiving roll,
A plastic film punching device characterized in that heat-resistant fibers are planted in a cylindrical brush shape on the outer periphery of a rod-shaped central shaft portion.