JPS641296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides polyethylene, polyvinyl chloride,
When manufacturing a cylindrical film from thermoplastic synthetic resin such as polypropylene by the inflation method,
On the outer surface of the cylindrical molten resin extruded from the annular mouthpiece,
This invention relates to an improvement of a two-stage annular cooling device that solidifies by blowing cold air.

The inflation method can produce synthetic resin bags and films with relatively simple equipment, but cooling the cylindrical molten resin improves the product's transparency, gloss, impact strength, tensile strength, It is an extremely important and delicate process that greatly affects quality such as directionality and manufacturing speed, and it is a theory that it depends on the type of resin used.
Even for the same resin, the optimum conditions differ depending on the thickness of the film.

The present invention allows the width of the annular slit for blowing out cold air provided above the annular base to be adjusted, and the position of the annular slit to be easily moved up and down.
To provide a cooling device capable of efficiently manufacturing high-quality cylindrical films by cooling cylindrical molten resin under optimal conditions when manufacturing cylindrical films of various thicknesses made of various resins. This will be specifically explained below based on the attached drawings.

FIG. 1 schematically shows an apparatus for manufacturing a synthetic resin cylindrical film by the inflation method. The cylindrical molten resin 3 is heated and kneaded in an extruder 1 and continuously extruded from an annular mouthpiece 2. The cylindrical film 4 is expanded by the pressurized air sealed inside while being cooled by the annular cooling device A according to the present invention.
becomes.

FIG. 2 shows an annular cooling device A, in which an appropriate number of cold air supply cylinders 6 are connected to the peripheral end of the lower plate 5a of the doughnut-shaped cold air chamber 5. teeth,
It is connected to a blower (not shown).

An upwardly facing outer cylinder 7 is fixed to the inner edge of the upper plate 5b of the cold air chamber 5, and an upwardly facing outer cylinder 7 is fixed to the inner edge of the lower plate 5a, and the upper end thereof is approximately at the center of the outer cylinder 7 in the height direction. A small diameter inner cylinder 8 of equal height is fixed. Female threads 9 and 10 are cut in the inner surface of the outer cylinder 7 from the upper end to the vicinity of the center, and in the lower part of the inner surface of the inner cylinder 8, respectively.

An upper adjustment ring 11 is screwed into the female thread 9 of the outer cylinder 7, and has an inner surface facing obliquely upward in the centripetal direction and a thread 11a cut on the outer peripheral surface. This adjustment ring 11 is oriented in the up-down direction,
In addition, at least three rod-shaped handles 12 each having a flange 13 and a locking piece 14 are loosely fitted in the center and lower ends so as to be able to move up and down. protrudes to.

Each handle 12 is normally positioned at its upper limit due to a compression spring 15 wound between its flange 13 and the upper adjustment ring 11, and the locking piece 14 is in contact with the lower surface of the upper adjustment ring 11.

A large number of ventilation holes 16 arranged in an annular row at equal intervals are bored in the lower part of the inner cylinder 8, and an outward flange 17 is connected to the upper end thereof. is provided with a male thread 17a.

A low-sized adjustment cylinder 18 whose upper surface faces obliquely upward in the centripetal direction is screwed into the lower end of the female thread 10 of the inner cylinder 8.

Further, slightly above the adjustment cylinder 18, a low-sized lower adjustment ring 19 whose inner surface faces obliquely upward in the centripetal direction is screwed into the female thread 10, and between the ring 19 and the adjustment cylinder 18, A lower annular slit 20 is formed which slopes inwardly and upwardly.

Reference numeral 21 denotes an elevating cylinder whose outer diameter is slightly smaller than the inner diameter of the outer cylinder 7 and whose upper end forms an inclined surface facing diagonally upward in the centripetal direction. 22 is provided protrudingly.

A T-shaped engagement fitting 23 is provided on the upper surface of the annular flange 22 at a location corresponding to the handle 12.
has been erected.

Furthermore, a female thread 24 having the same pitch as the female thread 9 of the outer cylinder 7 is cut into the inner surface of the elevating cylinder 21 from the lower end to near the upper end.

The elevating tube 21 is attached to the inner tube 8 so as to be movable up and down by having its female thread 24 screwed into the male thread 17a of the flange 17. An upper annular slit 25 is formed which slopes upward.

Therefore, the cold air sent into the cold air chamber 5 from each inlet cylinder 6 passes through each ventilation hole 16 and is ejected from the lower annular slit 20, and also flows through the outer cylinder 7 and the elevator cylinder 21.
The cylindrical molten resin 3 passed through the upper annular slit 25 and extruded from the annular mouthpiece 2 is cooled and solidified to form a cylindrical film 4.

Since the upper adjustment ring 11 is screwed into the outer cylinder 7, by rotating the upper adjustment ring 11 in forward and reverse directions using the handle 12,
The width of the upper annular slit 25 can be varied.

For example, if the width of the upper annular slit 25 is narrowed, the amount of jet air from the lower annular slit 20 decreases, and the amount of jet air from the lower annular slit 20 increases, changing the cooling rate ratio between the two annular slits 20 and 25, and furthermore, By appropriately adjusting the total amount of cold air fed into the annular slits 5, the amounts of jet air in both the annular slits 20 and 25 can be changed.

Furthermore, as shown in FIG.
is pushed down against the spring 15 until the locking piece 14 contacts the flange 22 of the lifting tube 21, and then rotated clockwise when viewed from above, the locking piece 14 will engage the engaging metal fitting. 23, the upper adjustment ring 11 and the lifting cylinder 21 are linked.

In this state, if the handle 12 is further rotated in the same direction, the upper adjustment ring 11 and the elevating cylinder 21 will rotate together to change the width of the upper annular slit 25, as shown in FIG. It can be lowered without any trouble.

When the upper annular slit 25 has descended to a predetermined position, if the handle 12 is slightly rotated in the opposite direction, the engagement between the locking piece 14 and the engagement fitting 23 is released, and the handle 12 is released from the bias of the spring 15. 2, and returns to the state shown in FIG.

To raise the upper annular slit 25, operate the handle 12 to move the locking piece 14 into the engagement fitting 2.
3, and then rotate the handle 12 counterclockwise.

As mentioned above, according to the apparatus of the present invention, the cooling mode and cooling position of the cylindrical molten resin can be adjusted in a variety of ways, so that high-quality cylinders with a wide range of thicknesses can be produced using a wide variety of synthetic resins. It is possible to easily and efficiently produce a shaped film.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a cylindrical film manufacturing apparatus using the inflation method equipped with the apparatus of the present invention, and FIG. 3 is a view corresponding to the cross section taken along the line X-X in FIG. 2, showing a state in which the position of the upper annular slit is being adjusted. FIG. 4 is an enlarged front view of the center cross section of the device of the present invention with the upper annular slit as the lower limit. It is. A... Annular cooling device, 1... Extruder, 2... Annular mouthpiece, 3... Cylindrical molten resin, 4... Cylindrical film, 5... Cold air chamber, 5a... Lower plate, 5b... Upper plate, 6... feeding cylinder, 7... outer cylinder, 8... inner cylinder,
9, 10...Female thread, 11...Upper adjustment ring,
12...Handle, 13...Flange, 14...
Locking piece, 15...Compression spring, 16...Vent hole, 1
7... Flange, 17a... Male thread, 18... Adjustment tube, 19... Lower adjustment ring, 20... Lower annular slit, 21... Lifting tube, 22... Annular flange, 23... Engaging metal fitting, 24...Female thread, 25
...Upper annular slit.

Claims (1)

[Claims] 1. An upwardly facing outer cylinder of the cooling device main body is provided above the annular mouthpiece following the extruder, and an upper annular slit for blowing out cold air is formed in a female thread carved on the inner surface of the outer cylinder. Screw together the male thread engraved on the outer circumferential surface of the upper adjustment ring for the purpose of adjusting the height. The handle is screwed into a male thread carved on the outer circumferential surface of the inner cylinder provided with the handle so that it can be raised and lowered, and the lower part of the handle that faces in the vertical direction is inserted through the upper adjustment ring in a suitable position so that it can be raised and lowered. 1. An annular cooling device for a thermoplastic synthetic resin cylindrical film manufacturing apparatus, characterized in that a removable mutual engagement device is provided at the lower end of a handle and at appropriate locations on the outer surface of an elevating tube. 2. The device according to claim 1, wherein the female thread on the inner surface of the outer cylinder and the female thread on the inner surface of the elevating tube have the same pitch. 3. Claims 1 or 2, characterized in that the mutual engagement device consists of a locking piece provided at the lower end of the handle and a T-shaped engagement fitting provided on the outer surface of the elevator tube. The device described. 4. An outer cylinder facing upward in the cooling device main body is provided above the annular mouthpiece following the extruder, and an upper adjustment ring for forming an upper annular slit for blowing out cold air is attached to a female thread carved on the inner surface of this outer cylinder. The male thread engraved on the outer circumference of the outer cylinder is screwed together, and the female thread engraved on the inner surface of the elevating cylinder provided inside the outer cylinder is screwed into the inner cylinder provided upwardly inside the elevating cylinder. It is screwed into a male thread carved on the outer circumferential surface so that it can be raised and lowered, and the lower part of a handle that faces in the vertical direction is inserted through the upper adjustment ring at an appropriate position so that it can be raised and lowered, and the lower end of the handle and the elevator tube are connected to each other. A removable inter-engaging device is provided at a suitable location on the outer surface of the slit, and a second lower annular slit for blowing out cold air is provided between the upper annular slit and the annular cap, and the cold air source is the same as that of the upper annular slit. An annular cooling device in a thermoplastic synthetic resin cylindrical film manufacturing apparatus, characterized in that the annular cooling device is provided. 5. The device according to claim 4, wherein the female thread on the inner surface of the outer cylinder and the female thread on the inner surface of the elevating tube have the same pitch. 6. Claim 4 or 5, characterized in that the mutual engagement device consists of a locking piece provided at the lower end of the handle and a T-shaped engagement fitting provided on the outer surface of the elevator tube. The device described.