JPH061397Y2 - Multi-layer inflation-production equipment for film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field Used Industrially] The present invention relates to an apparatus for manufacturing a multilayer blown film by using a center feed and a side feed together.

[Prior art and its problems]

This type of multi-layer blown film production equipment improves the difficulty in the placement of the extruder, which is a drawback of the all-side-feed production equipment that does not have a resin passage in the center of the feeder, especially the adverse effect of thermal expansion due to large size. It has been developed for commercial use and is distributed and sold in the market.The main form is to connect a resin passage, which is one vertical hole provided in the center of the feeder, to the resin supply port provided at the center of the lower end of the feeder, The molten resin for the innermost layer is supplied in this vertical hole by the feed method, and the remaining plural cylindrical resin passages are supplied with the molten resin of each layer by the side feed method from each resin supply port provided on the side surface of the feeder main body. One-to-one correspondence with these resin passages, multiple resins of dies are distributed through radial distribution, the outer ones are the outer ones, the inner ones are the inner ones. Is a format that communicates each communication in a one-to-one correspondence.

In a multilayer blown film manufacturing apparatus of this type, since the resin that is the innermost layer is always fed by the center feed method to the vertical hole that penetrates the center of the feeder in the vertical direction, the resin of other layers, especially the most It cannot be supplied to the resin passage of the feeder by the resin center feed which is the next layer of the inner layer.

Due to such drawbacks, it is extremely difficult or impossible to mold the next layer from a resin whose surface is likely to deteriorate like the innermost layer.

[Means for solving problems]

This invention is a feeder that concentrically inserts at least two sets of feeder nozzles inside a feeder main body to form a plurality of resin passages divided into inner and outer layers, and communicates with each resin passage on the upstream side and the downstream side. In a manufacturing apparatus for a multilayer inflation film including a die having a plurality of cylindrical resins divided into inner and outer layers connected to a single annular discharge port, an innermost layer resin passage formed in the feeder is provided on a side surface of the feeder main body. The formed resin supply port is composed of one vertical hole bored in the central feeder nozzle communicating with the 90 ° curved path, and the resin passage next to the innermost layer resin passage is
A resin supply port provided at the center of the lower end of the central feeder nozzle communicates with a radial resin distribution passage branched at a position near the curved passage, and a gap between the central feeder nozzle and an adjacent feeder nozzle forms a cylindrical resin passage. Formed,
The resin passages in the remaining feeders are connected to resin supply ports formed at different positions on the side surface of the feeder main body, and the resin passages are communicated with each other. No need to change the order of the inner and outer resin passages of the die, and to change the order of the inner and outer resin passages on the feeder nozzle side without complicating the structure to the innermost layer and the next layer. The apparatus is capable of producing a multi-layer blown film having a resin layer whose surface is easily deteriorated.

[Effect of device]

In the present invention, the innermost layer resin passage of the feeder main body is
A single vertical hole is formed in the central feeder nozzle, and a molten resin is supplied to this vertical hole through a 90-degree bending path by a side feeder method from a resin supply port formed on the side surface of the feeder main body. While forming the innermost layer of the multilayer film, another molten resin can be supplied to the next resin passage through the resin branch passage from another resin supply port provided at the center of the lower end of the central feeder nozzle. The secondary resin supplied from the resin supply port provided at the center of the lower end of the feeder nozzle,
By the resin distribution path that radially branches in the vicinity of the bent path, the order of the innermost layer resin that goes through the bent path and goes to the vertical hole in the center can be changed in the central feeder nozzle, and a large number of blocks can be formed. A multi-layer blown film can be formed without changing the inside / outside order of the resin path at the die position, which is a combination of the two, does not cause the complexity of the die, and the flow path in the central feeder nozzle of the next resin is , After being radially divided by the branch passage, since it is directly connected to the next cylindrical resin passage, the contact distance of the resin with the central feeder nozzle flow passage wall is shortened, and the next next layer to the innermost layer is Even a resin that easily deteriorates can be satisfactorily supplied into the die.

〔Example〕

Next, a three-layer blown film manufacturing apparatus, which is a typical embodiment of the present invention, will be described with reference to the drawings.

In the figure, 10 is a feeder, and this feeder 1
0 has a feeder body 11 and two tubular feeder nozzles 12, 13. The feeder main body 11 has a hole 14 penetrating in the axial direction and two resin supply ports 15 and 16 extending in the radial direction. These resin supply ports 15, 1
6 are provided with their phases shifted, and are not shown in the drawings.
It is connected to the first and third extruders. The two tubular feeder nozzles 12 and 13 are concentrically overlapped with each other and inserted into the hole 14 of the feeder main body 11, and the upper end portions thereof project upward from the feeder main body 11. In addition,
The flanges 12a and 13a formed at the lower ends of the inner and outer feeder nozzles 12 and 13 are located below the feeder main body 11, respectively, and the mounting bolts are tightened from the respective flanges 12a and 13a to the feeder main body 11. The feeder nozzles 12 and 13 are concentrically fixed to the feeder main body 11.

The inner layer resin passage 17 of the feeder 10 is formed by a single vertical hole formed in one of the two feeder nozzles 12 and 13 at the central feeder nozzle 12, and the inner layer resin passage 17 is a 90-degree bend path. It is connected to the resin supply port 15 formed on the side surface of the feeder main body 11 via 18 and is opened at the upper end of the nozzle.

An outer layer cylindrical resin passage 19 is formed by a gap between the peripheral walls of the other outer feeder nozzle 13 and the hole 14 of the feeder body 11, and the outer layer cylindrical resin passage 19 is formed on the side surface of the feeder body 10 by the resin supply port. It communicates with 16.

A resin supply port 20 connected to a second extruder (not shown) is provided at the center of the lower end of the central feeder nozzle 12, and the resin supply port 20 has a radial shape (including a bifurcation) in the vicinity of the bent path 18. ), The resin distribution path 21 that branches in the radial direction
Are connected.

This central feeder nozzle 12 and the outer feeder nozzle 1
An intermediate layer cylindrical resin passage 22 is formed by the gap between the three, and the intermediate layer cylindrical resin passage 22 communicates with the radially branched resin distribution passage 21 at its upstream end.

Reference numeral 30 denotes a die that is placed above the feeder 10 and integrally assembled. In this die 30, three cylindrical resin passages 31, 32, 33 of an inner layer, an intermediate layer and an outer layer are concentrically formed. The inner layer cylindrical resin passage 31, the intermediate layer cylindrical resin passage 32, and the outer layer cylindrical resin passage 33 are formed on the corresponding feeder 10 through the communicating holes 34, 35, 36 provided in the die 30 in the radial direction. The resin passages 17, the intermediate layer cylindrical resin passages 22 and the outer layer cylindrical resin passages 19 are in one-to-one correspondence and communicate with each other on the upstream side in a regular order, that is, without changing the order. The downstream side of the cylindrical resin passages 31, 32, 33 is connected to a single annular discharge port 37 provided in the die 30.

Reference numeral 40 denotes a resin supply sleeve connected to the bent portion 18, and the feeder main body 11 and the outer feeder nozzle 1 are provided.
3 is penetrated and the axis line is arrange | positioned as horizontal. At the outer end of the sleeve 40, the resin supply port 1 for the inner layer resin
5 is formed.

The outer layer cylindrical resin passage 19 between the outer feeder nozzle 13 and the feeder main body 11 and the intermediate cylinder between the two feeder nozzles 12 and 13 are provided in the step portion located inside the feeder nozzle 13 outside the sleeve 40. Resin passage 2
An O-ring 41 made of Teflon resin, which is a kind of seal ring for partitioning 2, is fitted.

[Action]

 The operation of this invention having the above-mentioned structure will be described below.

The first, second, and third extruders are connected to the resin supply ports 15, 20, and 16, respectively, and the molten resin serving as the innermost layer passes through the curved path 18 from the resin supply port 15 and is in the center. From the inner layer resin passage 17 of the feeder nozzle 12, the die 3
It is supplied into the innermost layer resin passage 31 of 0 by the side feed method.

Further, the intermediate layer, that is, the molten resin to be the next layer of the innermost layer, is the resin supply port 20 at the center of the lower end of the central feeder nozzle 12.
The resin is distributed in the resin distribution passage 21 in the radial direction, and is supplied from the intermediate cylindrical resin passage 22 into the intermediate layer cylindrical resin passage 32 of the die 30 by a center feed method.

The remaining molten resin serving as the outer layer is supplied from the resin supply port 16 on the side surface of the feeder body 11 through the outer layer cylindrical resin passage 19 into the outer layer cylindrical resin passage 33 of the die 30 by a side feed method.

In this way, the cylindrical resin passages 31, 32, 3 of the die 30 are
The molten resin of each layer respectively supplied to 3 is matched at the annular ejection port 37 and ejected from the annular ejection port 37 as a multilayer film to be an inflation film.

[Effects specific to the embodiment]

In the embodiment shown in the figure, since the resin distribution passage 21 is radially branched into two branches and communicates with the intermediate layer cylindrical resin passage 22 at a position different in 180 ° direction,
Since each of the passages to the central feeder nozzle 12 can be easily processed, and the intermediate layer resin is branched and thus supplied to the intermediate layer cylindrical resin passage 22, the resin supply of the central feeder nozzle 11 is performed. The deterioration of the molten intermediate layer resin between the port 20 and the intermediate layer cylindrical resin passage 22 due to the frictional force with the inner surface of each passage can be reduced as compared with the conventional side feed type.

The outer layer cylindrical resin passage 19 and the intermediate cylindrical resin passage 2 are formed in a step portion near the inner end of the resin supply sleeve 40 forming the resin supply port 15 inside the outer feeder nozzle 12.
In a mode in which a seal ring 41 for partitioning 2 is fitted, the inner end of the sleeve 40 and the outer feeder nozzle 12
The intermediate layer cylindrical resin passage 22
In the feeder 10, the molten resin of the intermediate layer leaching from the outer layer and the molten resin of the outer layer leaching from the outer layer cylindrical resin passage 19 into the gap between the step portion of the sleeve 40 and the fitting portion of the outer feeder nozzle 12 Mixing can be prevented in advance, and as a result, a three-layer film in which the intermediate layer and the outer layer are orderly integrated can be inflation-molded.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a typical embodiment of this invention. Description of main symbols in the drawing 10 ... Feeder, 17 ... Inner layer resin passage, 18 ... Bending passage, 21 ... Resin distribution passage, 22 ... Intermediate layer cylindrical resin passage.

Claims (1)

[Scope of utility model registration request] 1. A feeder for concentrically inserting at least two sets of feeder nozzles inside a feeder main body to form a plurality of resin passages divided into inner and outer layers, and a feeder communicating with each of the resin passages on an upstream side and a downstream side. In a manufacturing apparatus for a multilayer inflation film, which comprises a die having a plurality of cylindrical resin passages divided into inner and outer layers connected to a single annular discharge port on the side, the innermost layer resin passage formed in the feeder is the feeder main body. The resin supply port formed on the side surface is composed of one vertical hole formed in the central feeder nozzle communicating with the 90 ° curved path. The resin path next to the innermost layer resin path is the lower end of the central feeder nozzle. It communicates with the resin supply port provided in the center through a radial resin distribution path that branches near the curved path, and a circle is formed by the gap between the central feeder nozzle and the adjacent feeder nozzle. An apparatus for manufacturing a multi-layer blown film, characterized in that a resin path in the remaining feeder formed as a cylindrical resin passage communicates with a resin supply port formed at a position on the side surface of the feeder in a different direction.