JPS6312988Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a continuous manufacturing apparatus for synthetic resin hollow bodies, which is used for cushioning materials, heat insulation materials, etc., and continuously manufactures thermoplastic synthetic resin films in which many hollow bodies are filled with gas. .

As shown in FIG. 1, the synthetic resin film 1 includes a synthetic resin film A3 in which a large number of convex portions 2 are formed, and a synthetic resin sheet B4 in which a large number of convex portions 2 of the same shape are formed. , 2 are brought into contact with each other and adhesively formed. There is gas (generally air) in the hollow body 5 that is sealed by the opposing convex portions 2, 2.
is filled with. As mentioned above, the synthetic resin film 1 is widely used for cushioning materials, heat insulating materials, etc., and there have been various types of continuous production equipment for it. One in which convex portions 2, 2 are formed is generally employed. A prior art device is shown in FIGS. 2 and 3.

Figure 2 was introduced in Japanese Patent Publication No. 40-16875, and the inflation tube 6 is the extruder 19.
The tube is extruded from a die 7 connected to the tube, is transformed into a flat tube having approximately two flat plate portions by a stabilizer plate 8, and then passes between grooved pinch rolls 9. Inside the inflation tube 6, there is a fine pressure regulator 10.
Pressurized air whose pressure has been adjusted by the tube is supplied to keep the wall thickness and fold warp (width when the tube is flat) of the flat tube constant, and to prevent the two surfaces of the flat tube from coming into close contact with each other. On the other hand, endless belt 1
A large number of recesses 12 corresponding to convex portions of the product are formed in contact with each other in the recesses 1 and 11a, and are heated by a heating section 13 and cooled by a cooler 14. Flattened inflation tube 6
is heated by the endless belts 11 and 11a, and then is crimped and heat-sealed as it passes between the crimping rolls 15, and is also pressed into the recess 12 by the built-in pressurized air to form the hollow body 16. . Therefore, pressurized air is forced into the hollow body 16 and the hollow body 16 is sealed. Next, the inflation film 6' forming the hollow body 16 is placed in the cooler 1.
After being cooled at step 4, it passes through a guide roll 17 and is wound around a winding roll 18.

In the above device, the hollow body 16 is formed solely by the pressurizing force of the pressurized air within the inflation tube 6, as described above. Therefore, if the pressing force is weak, the hollow body 16 cannot be formed sufficiently, whereas if the pressing force is high, the inflation tube swells too much, making it impossible to form the hollow body 16 of a predetermined size. For this reason, it is possible to adopt a method of housing the entire device in a high-pressure air chamber, balancing the pressure, and forming a predetermined hollow body 16, but the device as a whole becomes expensive and has the drawback of lacking practicality.

Fig. 3 was introduced in Utility Application No. 39-059255, and the inflation tube 6a extruded from the die 7a connected to the extruder 19a is pressurized from an air source via the control valve 19. Air is supplied. This inflation tube 6a has a heater 21 installed therein, and is fed into a heat-retaining constant pressure chamber 22 maintained at the same or slightly lower air pressure than the pressurized air inside the inflation tube 6a for cooling and heating. Expansion is prevented. Next, the inflation tube 6a is inserted between the forming roll A23 and the forming roll B24, which are provided facing each other, and applies clamping pressure.
It is crimped and becomes an inflation film 6a'. A concave portion 25 corresponding to a convex portion of the product is formed on the outer periphery of the forming roll A23 and the forming roll B24, and an air vent hole 26 communicates with the concave portion 25. The inflation film 6a' is pressed into the recess 25 by the built-in pressurized air to form a hollow body 16a. At this time, the air in the recessed part 25 is released from the air vent hole 26. In addition, the inflation film 6a' is placed in the recessed part 25 of the forming roll A23 and the forming roll B24.
In order to ensure sufficient embossing, a clamping pressure buffer plate 27 and a temperature regulator 28 are provided on the outer circumferential side.
As described above, inflation film 6
A hollow body 16a is formed in a', but as described above, this method requires a constant temperature constant pressure chamber 22, a clamping pressure buffer plate 2
7 and a temperature regulator 28 are required, which has the drawback of making the device complicated and expensive.

Furthermore, both of the above two conventional techniques have the disadvantage that vertical and horizontal wrinkles occur on the outer surface of the inflation tubes 6, 6a when they are formed into a flat shape.

The present invention was devised to solve the above-mentioned drawbacks, and its purpose is to reliably form a hollow body of a predetermined shape on an blown film, without causing wrinkles, and at low cost and simplicity. An object of the present invention is to provide an apparatus for continuously manufacturing synthetic resin hollow bodies.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 4, the inflation tube 6b is extruded from the die 7b connected to the extruder 19b, and pressurized air from the pressure regulating and heating device 29 is fed into the inner surface of the inflation tube 6b. has been done. This pressure regulating and heating device 29 is connected to an air source 30. The pressure of the pressurized air inside the inflation tube 6 is 10m/mAq to 5.0mAq.
The pressure is regulated to m/mAq.

A stabilizing plate 30 is provided near the end of the inflation tube 6 in the extrusion direction for deforming the inflation tube 6 from a cylindrical shape to a flat shape. The stabilizing plate 30 is formed from two opposing plate members, and is inclined so that the ends of the inflation tube 6 in the extrusion direction are brought close to each other, and is provided at an angle with the outer periphery of the inflation tube 6. They are provided in a non-contact state with a distance of δ. In addition, a large number of small holes 31 are formed in the stabilizer plate 30, and high temperature pressurized air is introduced from a pressurized air source 32 into the small holes 31, and the air is blown out onto the outer peripheral surface of the inflation tube 6. be made into Further, a moving means (not shown) engages with the stabilizing plate 30, so that the stabilizing plate 30 is movable in a direction parallel to the extrusion direction of the inflation tube 6.

A forming roll A 33a and a forming roll B 33b facing each other and close to each other are provided on the above-mentioned close end side of the stabilizing plate 30, and the inflation film 6b' formed into a flat shape by the stabilizing plate 30 is
It is inserted into the adjacent gap between the forming rolls A33a and B33b. A large number of recesses 34 corresponding to convex portions of the product are formed on the outer circumferences of the forming roll A 33a and the forming roll B 33b, and vacuum passages 35 are formed in communication with the recesses 34, respectively. Further, the vacuum passage 35 communicates with a vacuum source 36. Forming roll A
The recesses 34 of 33a and B33b are provided facing each other. Therefore, a vacuum is introduced into the opposing recesses 34 at the same time. Note that the vacuum pressure is adjusted by a pressure regulating means (not shown). Also forming roll A3
3a and B33b are engaged with moving means (not shown), making them movable in the extrusion direction of the blown film 6b'.

The inflation film 6b' inserted between the forming rolls A33a and B33b is inserted into the recess 35.
The inflation film 6 is pushed into the interior by the vacuum pressure and its internal pressure to form a convex portion.
Hollow bodies 37 protruding from both sides of b' are formed and fused together. Then, the inflation film 6b' having the hollow body 37 formed thereon is moved to a winding roll 38.
It is wound by.

Now, as described above, since the stabilizing plate 30 does not come into contact with the inflation tube 6b, no vertical or horizontal wrinkles occur when the inflation tube 6b is deformed from a cylindrical shape to a flat shape. In particular, in the case of molding the hollow body 37 as described above, the stabilizing plate 30
Since the inflation tube 6b that engages with the inflation tube 6b is at a high temperature, when the stabilizing plate 30 comes into contact with the inflation tube 6b, wrinkles inevitably occur due to the frictional force. As there is almost no frictional force, wrinkles do not occur. Further, since air at an appropriate pressure is blown onto the outer peripheral surface of the inflation tube 6b, the inflation tube 6b is smoothly transformed from a cylindrical shape into a flat inflation film 6b'.

Moreover, the inflation film 6b' is formed by forming rolls A33a and B33 only by its internal pressure.
The hollow body 37 of a predetermined shape is reliably formed because it is not pushed into the recess 34 of b, but is sucked and pushed in by vacuum pressure.

Moreover, as mentioned above, forming rolls A33a and B
33b and the stabilizing plate 30 are both configured to be movable in parallel to the direction of extrusion of the inflation tube 6b, so that they can be positioned at the most appropriate position on the inflation tube 6b.

In addition, the stabilizer 30 and forming roll A of this embodiment
Both 33a and B33b do not have particularly complicated structures, and are advantageous in that they can be manufactured easily and at low cost.

In this embodiment, opposing convex portions were formed on both sides of the inflation film 6b to form the hollow body 37, but the convex portions were formed only on one side.
The same applies to the case where a flat film is fused to the other side.

Also, in Fig. 4, the inflation tube 6
Although b' is shown as being pushed upward, it may also be directed downward or sideways.

As is clear from the above description, according to the present invention, a hollow body of a predetermined shape can be reliably formed on a blown film, and the effect can be achieved easily and inexpensively without causing wrinkles. is raised.

[Brief explanation of the drawing]

Fig. 1 is a perspective sectional view showing a hollow body formed in a film, Figs. 2 and 3 are sectional views showing a conventional continuous manufacturing apparatus for hollow bodies, and Fig. 4 shows an embodiment of the present invention. Cross-sectional view, 1...Synthetic resin film, 2...Convex portion, 5,
16a, 37... Hollow body, 6, 6a, 6b... Inflation tube, 6', 6a', 6b'...
Inflation film, 7, 7a, 7b...
Die, 8, 30... Stabilizer, 18, 38... Winding roll, 19, 19a, 19b... Extruder, 29
. . . Pressure adjustment heating device, 30 . . . Air source, 31 . . . Small hole, 32 . . . Pressurized air source, 33a .
5...Vacuum passage, 36...Vacuum source.

Claims (1)

[Scope of utility model registration request] A continuous production device for a synthetic resin hollow body, which forms a hollow body by bringing concave portions formed on the outer peripheries of opposing molding rolls into contact with each other, and aligning a blown film sheet inserted between the molding rolls with the concave portions. In order to take up a cylindrical inflation tube containing pressurized air in the form of a sheet, stabilizing plates are provided on both sides of the inflation tube so that the ends in the extrusion direction are brought close to each other and facing each other. The stabilizing plate is disposed in a non-contact manner on the inflation tube, and is movably supported in a direction parallel to the extrusion direction of the inflation tube, and the stabilizing plate is attached to the inflation tube. a vacuum passage is formed in the forming roll to communicate the recessed portion with a vacuum source, and the forming roll is connected to the advancement of the inflation tube. 1. An apparatus for continuously manufacturing a synthetic resin hollow body, characterized in that the synthetic resin hollow body is supported movably in a direction parallel to the direction.