U.S. patent application number 15/571367 was filed with the patent office on 2018-12-20 for method for manufacturing a resin fiber and nozzle head and manufacturing device used in same.
The applicant listed for this patent is Kansai Electronics Co., Ltd.. Invention is credited to Masahiro Kondo, Kiyotaka Shinji, Kunihiro Shinji.
Application Number | 20180363167 15/571367 |
Document ID | / |
Family ID | 59384400 |
Filed Date | 2018-12-20 |
United States Patent
Application |
20180363167 |
Kind Code |
A1 |
Kondo; Masahiro ; et
al. |
December 20, 2018 |
Method for Manufacturing a Resin Fiber and Nozzle Head and
Manufacturing Device Used in Same
Abstract
Provided is a method for manufacturing a resin fiber capable of
increasing a production volume based on high operability, and a
nozzle head and a manufacturing device used in the same. The method
for manufacturing a resin fiber is a method for manufacturing a
resin fiber that is a long ultrafine fiber obtained by stretching a
thermoplastic resin by a high-pressure gas flow. A gas flow from a
high-pressure gas ejection port applies a negative pressure to a
discharge port, externally extracting and emitting a molten resin
inside the discharge port into the air while stretching the molten
resin, and stretching while cooling the molten resin. The
manufacturing device comprises an extruder that extrudes a molten
resin from a nozzle on a tip of a barrel while melting the resin
using a screw in the barrel, and a nozzle head attached to a tip of
the nozzle. The nozzle head is provided with a discharge port and a
high-pressure gas ejection port on a substantially vertical face.
The discharge port extrudes the molten resin, and the high-pressure
gas ejection port is provided near the discharge port and forms a
substantially horizontal gas flow so that the molten resin inside
the discharge port is externally extracted and emitted into the air
while stretched. The discharge port has a diameter set to 0.5 mm or
greater.
Inventors: |
Kondo; Masahiro; (Tokyo,
JP) ; Shinji; Kunihiro; (Tokyo, JP) ; Shinji;
Kiyotaka; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kansai Electronics Co., Ltd. |
Tokyo |
|
JP |
|
|
Family ID: |
59384400 |
Appl. No.: |
15/571367 |
Filed: |
August 29, 2017 |
PCT Filed: |
August 29, 2017 |
PCT NO: |
PCT/JP2017/030936 |
371 Date: |
November 2, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D04H 3/16 20130101; D04H
1/56 20130101; D01D 4/025 20130101; D01D 4/02 20130101; D01D 5/0985
20130101 |
International
Class: |
D01D 4/02 20060101
D01D004/02; D04H 3/16 20060101 D04H003/16; D01D 5/098 20060101
D01D005/098 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 14, 2016 |
JP |
2016-221401 |
Claims
1. A method for manufacturing a resin fiber that is a long
ultrafine fiber obtained by stretching a thermoplastic resin by a
high-pressure gas flow, the method comprising the steps of:
applying a negative pressure of a gas flow from a high-pressure gas
ejection port provided near a discharge port through which a molten
resin is extruded to the discharge port, externally extracting the
molten resin inside the discharge port, and emitting the molten
resin into the air while stretching the molten resin.
2. The method for manufacturing a resin fiber according to claim 1,
wherein the molten resin that remains inside the discharge port is
externally extracted and stretched by a negative pressure even when
the molten resin extruded from the discharge port is supplied from
an extruder and the supply of the molten resin from the extruder is
stopped.
3. The method for manufacturing a resin fiber according to claim 1,
wherein the discharge port has a diameter that decreases a flow
resistance of the molten resin so that the molten resin can be
extracted by the negative pressure resulting from the gas flow.
4. The method for manufacturing a resin fiber according to claim 3,
wherein the diameter of the discharge port is 0.5 mm or
greater.
5. A manufacturing device of a resin fiber that is a long ultrafine
fiber obtained by stretching a thermoplastic resin by a
high-pressure gas flow, comprising: an extruder that extrudes a
molten resin from a nozzle on a tip of a barrel while melting a
resin using a screw in the barrel; and a nozzle head attached to a
tip of the nozzle; the nozzle head being provided with a plurality
of pairs of a discharge port through which the molten resin is
extruded, and a high-pressure gas ejection port that is near the
discharge port and forms a substantially horizontal gas flow, on a
substantially vertical face; and the high-pressure gas ejection
port being positioned near the discharge port and the discharge
port having a diameter set to 0.5 mm or greater so as to externally
extract the molten resin inside the discharge port, and emit the
molten resin into the air while stretching the molten resin.
6. The manufacturing device of a resin fiber according to claim 5,
wherein the plurality of pairs is provided on the face along a
horizontal line.
7. The manufacturing device of a resin fiber according to claim 6,
wherein the high-pressure gas ejection ports of the plurality of
pairs are provided so that respective axes thereof are mutually
spread into a fan shape toward an ejection direction.
8. A nozzle head used in an extruder that extrudes a molten resin
from a nozzle on a tip of a barrel while melting a resin using a
screw in the barrel in a manufacturing device of a resin fiber that
is a long ultrafine fiber obtained by stretching a thermoplastic
resin by a high-pressure gas flow, and attached to the tip of the
nozzle, comprising: a plurality of pairs of a discharge port
through which the molten resin is extruded, and a high-pressure gas
ejection port that is near the discharge port and forms a
substantially horizontal gas flow, on a substantially vertical face
when the nozzle head is attached to the manufacturing device; the
high-pressure gas ejection port being positioned near the discharge
port and the discharge port having a diameter set to 0.5 mm or
greater so as to externally extract the molten resin inside the
discharge port, and emit the molten resin into the air while
stretching the molten resin.
9. The nozzle head according to claim 8, wherein the plurality of
pairs is provided on the face so as to extend along a horizontal
line when the nozzle head is attached to the manufacturing
device.
10. The nozzle head according to claim 9, wherein the high-pressure
gas ejection ports of the plurality of pairs are provided so that
respective axes thereof are mutually spread into a fan shape toward
an ejection direction.
11. The method for manufacturing a resin fiber according to claim
2, wherein the discharge port has a diameter that decreases a flow
resistance of the molten resin so that the molten resin can be
extracted by the negative pressure resulting from the gas flow.
12. The method for manufacturing a resin fiber according to claim
11, wherein the diameter of the discharge port is 0.5 mm or
greater.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a method for manufacturing
a resin fiber in which an extruded thermoplastic resin is stretched
by high-pressure gas to form an aggregate of long fibers, and a
nozzle head and a manufacturing device used in the same, and
particularly relates to a method for manufacturing a resin fiber
comprising an aggregate of long ultrafine fibers having a diameter
in the nano-order, a manufacturing device, and a nozzle head used
in the same.
Description of the Background Art
[0002] A resin fiber comprising an aggregate of long ultrafine
fibers having a diameter of several microns to sub-microns is used
in various filters and non-woven fabrics. While an electrospinning
method has been proposed from long ago as a method for
manufacturing such a resin fiber, in recent years many studies have
been conducted on a melt-blowing method due to the enhanced
productivity and safety thereof. In such a melt-blowing method, a
thermoplastic resin extruded from an extruder is emitted into the
air by blowing high-pressure gas using a nozzle part, forming an
aggregate of long fibers (refer to Non-Patent Document 1).
[0003] For example, Patent Document 1 discloses a method for
manufacturing a resin fiber comprising an aggregate of long
ultrafine polypropylene fibers based on a melt-blowing method. In
Example 2 thereof, a tip of a center discharge port through which a
molten resin is extruded is surrounded by a hot air blowout port,
the molten resin is stretched while the melted state of the resin
is maintained inside a hot air converging cylindrical part
extending downstream, the resin is emitted from an opening into the
air, and an aggregate of long fibers is collected by a collecting
part disposed in a horizontal direction. Here, while a diameter of
the center discharge port should be 0.1 to 0.2 mm, with the melted
state for stretching the resin in the hot air converging
cylindrical part being controlled, it is stated that, depending on
the inner diameter or adjustment of the temperature of the
interior, discharge is no longer possible or only ultrafine fibers
of a micron-order can be obtained.
[0004] Furthermore, Patent Document 2 also discloses a method for
manufacturing a resin fiber comprising an aggregate of long
ultrafine thermoplastic resin fibers based on a melt-blowing
method. A plurality of small molten resin spray ports is provided
around a most-expanded diameter opening through which a gas heated
to a temperature higher than the temperature of a molten resin is
sprayed outside the device in a horizontal direction, and a molten
resin sprayed upon pressurization is engulfed in a flow of a gas
sprayed from a gas spray port and then sprayed outside the device
from the most-expanded diameter opening, stretching the molten
resin in the spraying direction. Here, as one example, Patent
Document 2 describes a 3-mm tube diameter of the molten resin spray
port being decreased to 0.4 mm to apply pressure, and a gas being
sprayed from the gas spray port having a 2-mm diameter and then
ejected outside the device from the most-expanded diameter opening
having a 22-mm diameter.
PATENT DOCUMENTS
Non-Patent Documents
[0005] Non-Patent Document 1: Kunihiro Shinji, "Nanofiber no Sekai
(The World of Nanofibers)", Japan Electrical Insulating and
Advanced Performance Materials Industrial Association, Denzai
Journal, No. 626, 2015.5, PP.16-18
Patent Documents
[0005] [0006] Patent Document 1: Japanese Laid-Open Patent
Application No. 2013-185272 [0007] Patent Document 2: Japanese
Laid-Open Patent Application No. 2016-23399
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0008] In a method for manufacturing long ultrafine thermoplastic
resin fiber based on a melt-blowing method, the resin is stretched,
decreasing the diameter thereof. While the production volume can be
increased based on high operability by safely controlling such a
resin stretching step, in Patent Document 1 the hot air converging
cylindrical part is provided in order to isolate the stretching
step from the outside, and in Patent Document 2 a high-temperature
gas flow having a heat capacity greater than a capacity of the
resin is formed and the resin is sprayed therein, isolating the
sprayed resin from the outside.
[0009] The present invention was made in light of such
circumstances, and it is therefore an object of the present
invention to provide a method for manufacturing a resin fiber
capable of significantly increasing a production volume based on
high operability, and a nozzle head and a manufacturing device used
in the same.
Means for Solving the Problems
[0010] A method for manufacturing a resin fiber according to the
present invention is a method for manufacturing a resin fiber that
is a long ultrafine fiber obtained by stretching a thermoplastic
resin by a high-pressure gas flow, the method comprising the steps
of applying a negative pressure of a gas flow from a high-pressure
gas ejection port provided near a discharge port through which a
molten resin is extruded to the discharge port, externally
extracting the molten resin inside the discharge port, and emitting
the molten resin into the air while stretching the molten
resin.
[0011] According to such an invention, while the molten resin is
extracted and stretched into a long ultrafine fiber by a negative
pressure resulting from the gas flow, it is easy to stabilize
operation, achieve high operability, and increase the extruded
amount by simply adjusting the gas flow in accordance with the
extruded amount of resin, making it possible to significantly
increase the production volume based on high operability.
[0012] In the invention described above, the molten resin that
remains inside the discharge port may be externally extracted and
stretched by a negative pressure even when the molten resin
extruded from the discharge port is supplied from an extruder and
the supply of the molten resin from the extruder is stopped.
According to such an invention, it is possible to reliably extract
and stretch the molten resin into a long ultrafine fiber by the
negative pressure resulting from the gas flow from the
high-pressure gas ejection port.
[0013] In the invention described above, the discharge port may
have a diameter that decreases a flow resistance of the molten
resin so that the molten resin can be extracted by the negative
pressure resulting from the gas flow. Further, in the invention
described above, the diameter of the discharge port may be 0.5 mm
or greater. According to such an invention, it is possible to
reliably extract and stretch the molten resin into a long ultrafine
fiber by the negative pressure resulting from the gas flow from the
high-pressure gas ejection port, and further increase the
production volume.
[0014] Furthermore, a manufacturing device of a resin fiber
according to the present invention is a manufacturing device of a
resin fiber that is a long ultrafine fiber obtained by stretching a
thermoplastic resin by a high-pressure gas flow, comprising an
extruder that extrudes a molten resin from a nozzle on a tip of a
barrel while melting the resin using a screw in the barrel, and a
nozzle head attached to a tip of the nozzle. The nozzle head is
provided with a plurality of pairs of a discharge port that
extrudes the molten resin and a high-pressure gas ejection port
that is near the discharge port and forms a substantially
horizontal gas flow, on a substantially vertical face. The
high-pressure gas ejection port is positioned near the discharge
port and the discharge port has a diameter set to 0.5 mm or greater
so that the molten resin inside the discharge port is externally
extracted and emitted into the air while stretched.
[0015] According to such an invention, it is possible to extract
and stretch the molten resin into a long ultrafine fiber by the
negative pressure resulting from the gas flow, stabilize operation,
achieve high operability, and increase the extruded amount by
simply adjusting the amount of the gas flow in accordance with the
extruded amount of resin, and thus significantly increase the
production volume.
[0016] In the invention described above, the plurality of pairs may
be provided on the face along a horizontal line. Further, in the
invention described above, the high-pressure gas ejection ports of
the plurality of pairs may be provided so that the respective axes
are mutually spread into a fan shape toward an ejection direction.
According to such an invention, the production volume can be
further increased based on high operability.
[0017] Furthermore, a nozzle head according to the present
invention is a nozzle head used in an extruder that extrudes a
molten resin from a nozzle on a tip of a barrel while melting the
resin using a screw in the barrel in a manufacturing device of a
resin fiber that is a long ultrafine fiber obtained by stretching a
thermoplastic resin by a high-pressure gas flow, and attached to a
tip of the nozzle. The nozzle head is provided with a plurality of
pairs of a discharge port that extrudes the molten resin and a
high-pressure gas ejection port that is near the discharge port and
forms a substantially horizontal gas flow, on a substantially
vertical face when attached to the manufacturing device. The
high-pressure gas ejection port is positioned near the discharge
port and the discharge port has a diameter set to 0.5 mm or greater
so that the molten resin inside the discharge port is externally
extracted and emitted into the air while stretched.
[0018] According to such an invention, the nozzle head is attached
to a manufacturing device of a resin fiber, making it possible to
extract and stretch the molten resin into a long ultrafine fiber by
the negative pressure resulting from the gas flow, stabilize
operation, and achieve high operability by simply adjusting the
amount of gas flow in accordance with the extruded amount of resin.
Further, the extruded amount is increased, making it possible to
significantly increase the production volume.
[0019] In the invention described above, the plurality of pairs may
be provided on the face so as to extend along the horizontal line
when the nozzle head is attached to the manufacturing device.
Further, in the invention described above, the high-pressure gas
ejection ports of the plurality of pairs may be provided so that
the respective axes are mutually spread into a fan shape toward the
ejection direction. According to such an invention, the production
volume can be further increased based on high operability.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a cross-sectional view (partial block diagram) of
a main portion of a manufacturing device of a resin fiber in one
example according to the present invention.
[0021] FIGS. 2A and 2B are a front view and a side cross-sectional
view of a nozzle head, respectively.
[0022] FIGS. 3A and 3B are top cross-sectional views of a nozzle
head.
[0023] FIG. 4 is a scanning electron microscope (SEM) image of a
resin fiber manufactured by the manufacturing device of a resin
fiber.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] A manufacturing device of a resin fiber will now be
described as one example according to the present invention using
FIGS. 1 to 4.
[0025] As illustrated in FIG. 1, a manufacturing device 9 of a
resin fiber is a manufacturing device of a resin fiber that is a
long ultrafine fiber obtained by stretching a thermoplastic resin
by a high-pressure gas flow, and includes an extruder 1 that
extrudes a melted resin from a nozzle 2a, and a nozzle head 10
attached to a tip of the nozzle 2a.
[0026] The extruder 1 includes a barrel 2 and a screw 3 that knead
and transport a raw material such as a pellet made from a
thermoplastic resin toward the nozzle 2a while heating and melting
the raw material, and a hopper 4 for supplying the raw material to
an interior of the barrel 2. Further, the barrel 2 comprises a
heater 5 on an outer periphery thereof, making it possible to heat
the interior. The nozzle head 10 for discharging a resin is fixed
to the tip of the nozzle 2a provided in an extrusion direction of
the resin of the barrel 2. The nozzle head 10 is configured so as
to be connected to a gas heating part 7 by piping or the like, and
a high-pressure gas supplied from a gas supply part 6 such as a gas
compressor connected to an end thereof is heated and then supplied.
The gas heating part 7 can comprise a heating part such as a heater
around a gas pressure-feeding tube, for example.
[0027] As illustrated in FIGS. 2A and 2B, the nozzle head 10
includes an attaching part 19 on an outer peripheral side for
attaching the nozzle head 10 to the extruder 1, and a face part 11
on a center side where a main surface is disposed substantially
vertically (a normal line of the main surface is directed
horizontally) when the nozzle head 10 is attached to the extruder
1. The attaching part 19 comprises a bolt hole or the like (not
illustrated) for fixing the nozzle head 10 to the extruder 1.
Further, the face part 11 is provided so as to protrude in an
extrusion direction of the resin with respect to the attaching part
19.
[0028] The face part 11 is further provided with a discharge port
12 that discharges a resin, and a gas ejection port 13 that ejects
high-pressure gas. The discharge port 12 and the gas ejection port
13 form a pair with one of each disposed near each other. In this
example, a plurality of pairs of the discharge port 12 and the gas
ejection port 13 are provided. Providing such a plurality of pairs
can improve the production volume of resin fiber per unit time, and
is thus preferred.
[0029] The discharge port 12 communicates with a resin inflow
chamber 16. The resin inflow chamber 16 is positioned in the
extrusion direction of the resin with respect to the nozzle 2a of
the barrel 2 when the nozzle head 10 is attached to the extruder 1,
thereby forming a flow path of the melted resin supplied from the
nozzle 2a and making it possible to guide the melted resin to the
discharge ports 12. The resin inflow chamber 16 is separated by a
partition 15 from a gas inflow chamber 14 that forms a gas flow
path. The gas inflow chamber 14 is connected to the gas ejection
ports 13, and to an inflow port 14a of a high-pressure gas guided
from outside the nozzle head 10. It should be noted that the inflow
port 14a is connected to the gas heating part 7 described above. As
a result, the gas inflow chamber 14 can guide the entered
high-pressure gas to the gas ejection ports 13. Further, the axis
of the gas ejection port 13 is disposed substantially horizontally
so that the gas flow is formed substantially in the horizontal
direction by the ejected high-pressure gas. The discharge ports 12
are also each preferably disposed substantially in the horizontal
direction in line with the orientation of the gas ejection port 13
that forms the pair.
[0030] The gas ejection port 13 is disposed near the discharge port
12 as described above. In particular, the gas ejection port 13 is
disposed near the discharge port 12 so that the melted resin can be
externally extracted from inside the discharge port 12 by the
negative pressure generated by the formed gas flow, and emitted
into the air while stretched. Further, an inner diameter of the
discharge port 12 is set so that a flow resistance of the melted
resin is decreased, and the resin is extracted from the interior by
a negative pressure resulting from the gas flow. The flow
resistance of the melted resin decreases as the size of the inner
diameter is increased. For example, an inner diameter of an outlet
section of the discharge port 12 (near the surface of the face part
11) is preferably 0.5 mm or greater. In this example, the inner
diameter of the discharge port 12 is 1.0 mm, the inner diameter of
the gas ejection port 13 is 1.5 mm, and the distance between the
centers thereof is 1.75 mm.
[0031] It should be noted that, as long as the resin can be
extracted by the negative pressure as described above, the gas
ejection port 13 can be disposed in any direction, regardless if
above, below, or next to the discharge port 12. In this example,
pairs with the gas ejection port 13 disposed below the discharge
port 12 are arranged in an upper row, and pairs with the gas
ejection port 13 disposed above the discharge port 12 are arranged
in a lower row on the face part 11.
[0032] As illustrated in FIGS. 3A and 3B, in the plurality of pairs
of the discharge port 12 and the gas ejection port 13 arranged in
the lower row on the face part 11, the axes of the gas ejection
ports 13 are provided so as to be mutually spread into a fan shape
toward the ejection direction (upward in the drawing) in a
horizontal plane. For example, the axes of the gas ejection ports
13 on both ends overlap both radii of a center angle a having a fan
shape enclosed by two radii and an arc, and the axes of the other
ejection ports 13 are also disposed so as to pass through a center
point where the two radii of the same fan shape intersect.
Similarly, the axes of the discharge ports 12 are provided so as to
be mutually spread into a fan shape toward the discharge direction.
With such an arrangement, adjustments can be made so as to suppress
excessive intertwining between the resin fibers extracted from the
respective pairs and emitted into the air, making it possible to
increase the discharge amount of resin per unit time and increase
the production volume per unit time, and thus such an arrangement
is preferred. The same applies to the plurality of pairs of the
discharge port 12 and the gas ejection port 13 arranged in the
upper row on the face part 11.
[0033] It should be noted that the other details of the extruder 1
are publicly known, and a description thereof is omitted. Further,
the manufacturing device 9 suitably comprises a collecting part for
collecting the emitted resin fiber.
[0034] With reference to FIG. 1 once again, when a resin fiber is
manufactured by the manufacturing device 9, high-pressure gas
heated by the gas supply part 6 and the gas heating part 7 is
supplied to the nozzle head 10 and ejected from the gas ejection
ports 13 to form a gas flow while the resin melted by the extruder
1 is supplied to the nozzle head 10 and discharged from the
discharge ports 12. As a result, the gas flow from the gas ejection
ports 13 applies a negative pressure to a frontward side of the
discharge ports 12, causing the molten resin inside the discharge
ports 12 to be externally extracted and emitted into the air while
stretched into a long ultrafine fiber. That is, the resin fiber can
be manufactured by one type of melt-blowing method in which the
molten resin is emitted into the air and stretched while cooled. At
this time, operation can be easily stabilized by making the
extruded amount of the resin uniform and adjusting the amount of
gas flow in accordance with the extruded amount.
[0035] In particular, a resin fiber is continuously manufactured
for some time by simply supplying the high-pressure gas even if the
supply of the melted resin from the extruder 1 is stopped during
the manufacture of the resin fiber. That is, the resin that remains
inside the discharge ports 12 is found to be reliably externally
extracted and stretched by the negative pressure resulting from the
gas flow from the gas ejection ports 13.
[0036] As shown in FIG. 4, the resin fiber manufactured by the
manufacturing device 9 is found to be a long ultrafine fiber such
as a so-called nanofiber that has a diameter of about the micron
order to several hundred nanometers. Further, the resin fibers
moderately intertwine, and short, divided fiber and particulate
resin are substantially not produced.
[0037] Thus, according to the manufacturing device 9, it is
possible to manufacture a resin fiber that is a long ultrafine
fiber by extracting a resin melted in the discharge ports 12 and
emitting the resin into the air by the negative pressure resulting
from the gas flow from the gas ejection ports 13, and thus
stretching while cooling the resin. The resin is thus extracted
from the discharge ports 12, thereby making it possible to
stabilize operation and achieve high operability by simply
adjusting the amount of gas flow in accordance with the extruded
amount of the resin from the extruder 1. As described above, even
when a plurality of pairs of the discharge port 12 and the gas
ejection port 13 is arranged or the like and the discharge amount
of resin is increased, it is possible to significantly increase the
production volume based on high productivity as long as the amount
of gas flow is adjusted in accordance with the increase.
[0038] Further, while the manufacturing device 9 can manufacture a
long ultrafine fiber such as a nanofiber, the inner diameter of the
discharge port 12 is extremely large compared to the fiber
diameter, and is set to 1 mm in this example as described above.
That is, the diameter of the resin fiber manufactured by the
manufacturing device 9 is considered to not be dependent on the
diameter of the discharge ports 12, but rather dependent on a
balance between the gas flow from the ejection ports 13 and the
amount of resin supplied. That is, the flow rate and the negative
pressure from the ejection ports 13 are adjusted by adjusting the
amount of gas flow in accordance with the amount of melted resin to
be supplied. As a result, it is considered that the amount of
extracted resin is adjusted, and the diameter is adjusted by the
relationship with the gas flow rate. A long ultrafine fiber having
a preferred diameter can be manufactured by balancing the amount of
gas flow in accordance with the amount of melted resin to be
supplied. Thus, preferably the diameter of the discharge ports 12
is made relatively large to decrease the flow resistance of the
melted resin and facilitate the extraction of such a molten resin
as described above. Further, it is easy to increase the discharge
amount of the resin by relatively increasing the diameter of the
discharge ports 12, and further increase the production volume per
unit time by adjusting the amount of gas flow in accordance with
this increase.
[0039] It should be noted that the diameter of the discharge ports
12 is large, resulting in minimal clogging as well as extremely
easy maintenance.
[0040] Further, the production volume per unit time can be
increased by further increasing the number of pairs of the
discharge port 12 and the gas ejection port 13 of the nozzle head
10 by providing, for example, three or more rows of a plurality of
pairs on the face part 11.
[0041] While the above has described examples according to the
present invention and modifications based on these, the present
invention is not necessarily limited thereto. Further, those
skilled in the art may conceive various alternative examples and
modified examples without departing from the spirit or the appended
claims of the present invention.
DESCRIPTIONS OF REFERENCE NUMERALS
[0042] 10 Nozzle head [0043] 11 Face part [0044] 12 Discharge port
[0045] 13 Gas ejection port
* * * * *