JP2009072941A - Method and apparatus for producing extrusion-molded tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the traveling properties of a take-over belt and to apply drawing tension necessary for a taking-over hollow tube. <P>SOLUTION: In a take-over machine 30 for taking over the hollow tube 1 which is extruded continuously by an extrusion molding machine 10 and cooled by a cooler 20, the amount S of a belt clearance which is the size of the clearance between the lower belt surface of a take-over belt 31c holding the hollow tube 1 and the upper belt surface of a take-over belt 32c is adjusted. When the total height of the tube 1 is H, by making the amount of crushing of the hollow tube 1 ΔH=H-S about 1.5 mm or above, the tube drawing tension of the take-over machine 30 is made to exceed a tension threshold value of 10 kgf. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for manufacturing an extruded tube that is cooled by a take-up machine after cooling an extruded hollow tube, and in particular, a method for stably pulling an extruded tube while ensuring necessary tension. And an apparatus for the same.

A flexible hollow tube used for an ink tube of an inkjet printer or the like is usually manufactured using an extrusion molding apparatus. As shown in FIG. 9, the extrusion molding apparatus includes an extrusion molding machine 50, a cooler 60, and a take-up machine 70.
The extrusion molding machine 50 heats and melts a flexible resin in a cylinder 51, and forms this into a hollow tube having a desired cross-sectional shape by a molding die 53 provided at the tip of an extrusion head 52. And then extruded. The cooling device 60 includes a cooling tank 61 and the cooling tank 61 at 15 ° C.
And a cooling water supply device 63 for circulating a cooling water 62 of a degree, and the hollow tube 1 having a product temperature of about 190 ° C. extruded from the extrusion molding machine 50 is cooled to near room temperature by the cooling machine 60. And sent to the take-up machine 70.
Further, the take-up machine 70 holds the hollow tube 1 sent from the cooler 60 from above and below by the take-up belts 71 and 72, and conveys the take-up belts 71 and 72 in opposite directions. In the device for pulling out the hollow tube 1, the pulling belt 7
The hollow tube 1 is pulled while applying a force in such a direction that the hollow tube 1 is crushed by a predetermined amount in the thickness direction by adjusting the gap amount between 1 and 72. Thereby, the hollow tube 1 continuously extruded from the extruder 50 and cooled to near room temperature by the cooler 60 can be taken out while applying a predetermined tension (for example, see Patent Documents 1 to 3). ).
JP 2002-355881 A JP 2003-260730 A JP 2006-7754 A

By the way, when a hollow tube having a thickness of about 4 mm to 6 mm is taken up by the take-up machine 4, it is larger than a predetermined tension in the longitudinal direction of the hollow tube 1 extruded from the extruder 50, and It is required to apply a tension (drawing tension) smaller than a predetermined tension. This is because if the pull-out tension is low, the hollow tube 1 becomes thicker. Conversely, if the pull-out tension is too high, the hollow tube 1 is unnecessarily stretched and deformed so as to become thin. Hereinafter, the lower limit value of the tension is referred to as a tension limit value.
As a condition for obtaining a drawing tension that is equal to or greater than the above tension limit value, for example, an effective belt length that is a contact length between the hollow tube 1 and the take-up belts 71 and 72 is 850 m.
When it is about m, it is known that the clearance between the take-up belt 71 and the take-up belt 72 may be set so that the amount of crushing of the hollow tube 1 is in the range of several mm.
However, in the take-up machine 70 having a long belt effective length, the take-up belt 71,
Since the distance between the rollers 71a and 71b (or the rollers 72a and 72b) guiding the 72 is wide, it is difficult to make the take-up belts 71 and 72 and the hollow tube 1 uniformly contact with each other. Unevenness occurs in the take-up speed, and as a result, the hollow tube 1
There was a risk that the size and shape of the product would deviate from the standard.
If the roller interval is set narrow, the contact state between the hollow tube 1 and the take-up belts 71 and 72 is stabilized, but if the roller interval is simply reduced, the hollow tube 1 and the take-up belts 71 and 72 Since the length of the contact area of the tube becomes narrow, the hollow tube 1 has a tension limit value of 1
It becomes difficult to apply a drawing tension greater than 0 kgf.
In addition, it is conceivable that the diameters of the rollers 71a and 71b for guiding the take-up belts 71 and 72 are increased to stabilize the running performance of the take-up belts 71 and 72. It's not a method.

The present invention has been made in view of the conventional problems, and provides a method capable of stabilizing the runnability of the take-up belt and applying the necessary draw tension to the hollow tube to be taken. For the purpose.

The invention of the present application relates to a method for producing an extruded tube in which an extruded hollow tube is cooled and then taken up by a take-up machine having a predetermined belt effective length and a belt gap amount of a predetermined dimension. The tube crushing amount of the take-up machine is about 1.5 mm or more so that the tube drawing-out tension of the take-up machine exceeds the tension limit value of 10 kgf. Thereby, while being able to give tension | tensile_strength required for taking up to a hollow tube, the running stability of a take-up belt can be ensured, Therefore The quality of a hollow extruded tube can be improved.

In addition, since the hollow tube is a 9-tube, 6-tube, 4-tube or single tube, when the hollow tube is taken up by the take-up machine, the amount of tube crushing of the take-up machine is as described above. If it sets to, the quality of the said hollow tube can be improved reliably.
In addition, as the number of hollow tubes is increased, the amount of crushing with the same tension is set to be slightly smaller than that of the smaller number of tubes, so that the difference due to the tube shape can be further reduced.
Further, in the extruded tube manufacturing apparatus, after cooling the extruded hollow tube, the take-up machine has a predetermined belt effective length and a belt gap amount of a predetermined dimension. According to the extrusion tube manufacturing apparatus in which the tube pulling-out tension of the take-up machine exceeds the tension limit value of 10 kgf by making the tube crushing amount of the take-up machine approximately 1.5 mm or more, the hollow tube is pulled. The tension required for taking up can be applied and the running stability of the take-up belt can be ensured, so that the quality of the hollow extruded tube can be improved.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing an apparatus for manufacturing an extruded tube according to the best mode of the present invention. In each figure, 10 is a hollow tube having a desired cross-sectional shape by heating and melting a flexible resin. 20 is a cooling machine that cools a hollow extruded tube 1 (hereinafter referred to as a hollow tube) 1 extruded from the extruder 10 to a predetermined temperature, and 30 is the above-described cooling machine. This is a take-up machine that takes the hollow tube 1 with a predetermined tension and sends it to a subsequent process equipped with a cutting device (not shown).
2 (a) and 2 (b) are hollow tubes 1 manufactured by an extrusion tube manufacturing apparatus.
This hollow tube 1 is surrounded by a flexible resin 2 and has a hollow channel (hereinafter referred to as a hole) 3 having a circular cross section extending in the longitudinal direction of the tube 1. Is a quadruple tube formed in four rows. When viewed in a cross section perpendicular to the longitudinal direction, the outer peripheral surface of the hollow tube 1 has a wave shape in which the hole 3 and a concentric circular arc are connected to each other. As shown in FIG. The diameter H is equal to the thickness of the tube 1. Hereinafter, this diameter H is referred to as 4
This is called the total height of the continuous tube 1. Further, the dimension W of the tubes 1 in the arrangement direction is set to the quadruple tube 1.
Called width.
The feature of the hollow tube 1 of this example is that when the hole diameter is D, the dimension λ between adjacent holes 3 and 3
Is smaller than the value obtained by doubling the wall thickness h = (HD) / 2 of the tube 1. That is, the hollow tube 1 of this example is formed so that the wall thickness between the adjacent holes 3 and 3 is overlapped, so that the total width W is shorter than that of four hollow tubes having a diameter H. so,
Thereby, the ink tube can be reduced in size.
As shown in FIG. 3 (showing a 6-tube), such an ink tube 1 has connectors 1m added to both sides of the one cut to a predetermined length, and one connector 1m is placed on the ink tank side outside the figure. The other connector 1m is connected to the carriage 1c side via the male connector 1n, and is used as a member for transporting ink on the ink tank side to the recording head held by the carriage 1c.
However, the present invention is not limited to such a printer, but can be applied to medical use and other industrial fields.

Examples of the resin constituting the hollow tube 1 include polypropylene (PP), polyethylene (PE), olefin plastic elastomer (TPE), styrene TPE, polyamide TPE, and urethane TPE. A resin having flexibility after solidification is used.
When the hollow tube 1 is molded, as shown in FIG.
The hopper 11 of 0 is put into the cylinder 12, and the screw 13 is heated and melted.
Thus, the ink is discharged from the discharge port of the extrusion head 14. At the front end side of the extrusion head 14, the liquid resin discharged from the extrusion head 14 is extruded from the extrusion molding machine 10 in the form of a quadruple tube as shown in FIGS. 2 (a) and 2 (b). A head die 15 which is a molding die is attached.
FIG. 4 is a view showing an example of the configuration of the head die 15, and this head die 15 is a cylindrical outer mold 15a in which a through-hole 15m having the same outer cross-sectional shape as that of the hollow tube 1 to be extruded is formed. A holder 15b for supporting the outer mold 15a, and a through hole 15 of the outer mold 15a.
an inner mold 15c having four hole forming core pins 15n inserted into m, and the holder 1
5b, and a resin introduction member 15d called a spider that introduces the liquid resin discharged from the extrusion head 14 into the head die 15. The resin introduction member 15d The inner mold 15c is attached to the above.
At this time, it is important to adjust the central axis of the head die 15 so as to coincide with the central axis of the extrusion head 14. In this example, as shown in FIG. The through screw hole 14h is provided, and when the holder 15b is mounted, the bolt 14b is screwed into the through screw hole 14h, and the shaft 15 is aligned and fixed while adjusting the relative position with the holder 15b. Thereby, the hollow tube 1 sent to the cooler 20 of a post process can be reliably sent ahead along a central axis.
The resin discharged from the extrusion head 14 and injected into the head die 15 is shown in FIG.
As shown in b) and (c), the gap between the through hole 15m and the core pin 15n passes through the gap formed between the outer mold 15a and the inner mold 15c from the resin introduction member 15d. To the outside of the head die 15.

As shown in FIG. 1, the cooler 20 includes a cooling tank 22 in which cooling water 21 is stored and the cooling tank 2.
2 is provided with a cooling water supply device 23 for supplying a cooling water 21 of about 15 ° C. Cooling tank 22
A water supply port 22a is provided on the lower tank side of the wall surface 22p on the extrusion molding machine 10 side, and the wall surface 22 on the take-up machine 30 side.
A drain port 22b is provided on the lower tank side of q. Cooling water 21 sent from a cooling tank (not shown) provided in the cooling water supply device 23 is supplied into the cooling tank 22 from the water supply port 22a, and from the drain port 22b to the cooling tank of the cooling water supply device 23. Returned.
Further, a tube introduction hole 22c is provided on the wall surface 22p side of the cooling tank 22, and a tube discharge port 22d is provided at a position of the wall surface 22q facing the tube introduction hole 22c. That is, the tube introduction hole 22 c and the tube discharge port 22 d are provided at the same depth from the water surface of the cooling tank 22. Thereby, since the hollow tube 1 whose product temperature extruded from the extrusion molding machine 10 is about 190 ° C. can be kept in a straight line and sent to the take-up machine 30 in the subsequent process, it is unnecessary for the hollow tube 1. Without giving deformation
The hollow tube 1 can be cooled to near normal temperature.

The take-up machine 30 is a device that draws the hollow tube 1 sent from the cooler 20 while applying a predetermined tension. As shown in FIG. 1, the take-up machine 30 and the first belt device 31 and the first belt are used. A second belt device 32 installed below the device 31, a lifting device 33 that raises and lowers the first belt device 31 relative to the second belt device 32, and a base on which the lifting device 33 is installed. And a table 34.
The first belt device 31 includes a driving roller 31a, a driven roller 31b, an endless belt (hereinafter referred to as a take-up belt) 31c wound around these rollers 31a and 31b, and a deceleration for driving the driving roller 31a. And a motor 31M. The second belt device 32 has the same configuration as that of the first belt device 31, and includes a driving roller 32a, a driven roller 32b,
The first belt device 3 includes a take-up belt 32c and a reduction motor 32M.
1 and the second belt device 32 are arranged such that the lower belt surface of the take-up belt 31c and the upper belt surface of the take-up belt 32c face each other with a gap of a predetermined dimension. Has been.
The elevating device 33 is connected to the left and right of the rotation shafts of the rollers 31a and 31b of the first belt device 31 via bearings (not shown) to hold an upper support member 33a (holding the first belt device 31). One of the left and right is not shown) and the rollers 32a and 32b of the second belt device 32
A lower support member 33b (one of the left and right is not shown) that holds the second belt device 32 and is connected to the left and right of each of the rotation shafts via bearings, and a height adjustment member. And a certain rod-shaped screw member 33c.
The left and right upper support members 33a are connected to each other, and one upper support member 33a is provided with a female screw portion 33d extending in the vertical direction for screwing the rod-shaped screw member 33c. Yes. The left and right upper support members 33a are formed with guide holes 33n extending in the vertical direction for guiding guide rods 33m described later.
The left and right lower support members 33b are also connected to each other, and a lower end portion of the screw member 33c is rotatably supported at a position facing the female screw portion 33d of one lower support member 33b. A support hole 33k is provided. The left and right lower support members 33b are provided with guide bars 33m extending in the vertical direction and inserted into the guide holes. Reference numeral 33h denotes a handle attached to the upper end side of the screw member 33c.
Is rotated, the relative insertion depth of the screw member 33c into the female screw portion 33d changes, so that the upper support member 33a moves up and down while being guided by the guide rod 33m. Thus, the upper and lower distances between the left and right upper support members 33a and the left and right lower support members 33b, that is, the lower belt surface of the take-up belt 31c and the take-up belt 32c. The size of the gap with the upper belt surface can be changed.

In the take-up machine 30, as shown in FIG. 6A, the hollow tube 1 is sandwiched between the lower belt surface of the take-up belt 31c and the upper belt surface of the take-up belt 32c, The driving roller 31a of the first belt device 31 and the driving roller 32 of the second belt device 32
The hollow tube 1 is shown by a white arrow in the figure by rotating a in reverse.
It is pulled out to the side opposite to the extruder 10 (not shown) side and sent out.
At this time, the force for pulling the hollow tube 1, that is, the magnitude of the tension applied to the hollow tube 1 is a belt in which the hollow tube 1 and the take-up belts 31 c and 32 c are in contact with each other. When the effective length is constant, it depends on the dimension of the gap between the lower belt surface of the take-up belt 31c and the upper belt surface of the take-up belt 32c (hereinafter referred to as the belt gap amount). In this example, the effective belt length is 425 mm, which is half of the conventional 850 mm.
When the belt gap amount is S, as shown in FIG. 6B, a hollow tube sandwiched between the lower belt surface of the take-up belt 31c and the upper belt surface of the take-up belt 32c. 1 becomes the same as the belt gap amount S (the take-up belts 31c and 32c are hardly deformed by the force received from the hollow tube 1). That is, when the total height of the hollow tube 1 is H, the hollow tube 1 is crushed in a direction perpendicular to the belt surface by ΔH = HS. This ΔH is hereinafter referred to as a crushing amount. The larger the crushing amount ΔH, the greater the frictional force between the take-up belts 31c, 32c and the hollow tube 1, and as a result, the pulling tension of the hollow tube 1 increases. Become.

Therefore, when the effective belt length is 425 mm, which is half of the conventional 850 mm,
In order to give the hollow tube 1 a pulling tension greater than the tension limit value of 10 kgf, it was examined by experiment how much crushing amount is necessary.
When a hollow tube having a thickness of about 4 mm to 6 mm is taken up by the take-up machine 4, a predetermined tension of 10 kgf is applied in the longitudinal direction of the hollow tube 1 extruded from the extrusion molding stage 50.
It is required to apply a tension (drawing force) that is larger than the predetermined tension and smaller than a predetermined tension. This is because if the pull-out tension is low, the hollow tube 1 becomes thick, and if the pull-out tension is too large, the hollow tube 1 is unnecessarily stretched and deformed so as to become thin. The lower limit value 10 kgf of the tension is the tension limit value.
In the experiment, a testing machine 30A having the same configuration as the take-up machine 30 of the present invention as shown in FIG. 7 was used.
The difference between the take-up machine 30 and the test machine 30A is that the take-up belts 31c, 32c are prevented from rotating.
In the experiment, a hollow tube 1 having a predetermined length is placed on the upper belt surface of the take-up belt 32c of the testing machine 30A. At this time, both ends of the hollow tube 1 are extended to the outside of the take-up belt 32c, and a pull gauge 35 as a measuring instrument for measuring the pulling tension of the tube 1 is attached to one end side.
Next, the handle 33h is rotated to lower the upper support member 33a.
The hollow tube 1 is sandwiched between the lower belt surface of c and the upper belt surface of the take-up belt 32c. Then, the belt gap amount S, which is the dimension of the gap between the lower belt surface of the take-up belt 31c and the upper belt surface of the take-up belt 32c, is set to a predetermined value. At this time, the thickness H ′ of the hollow tube 1 is equal to the belt gap amount S, and the crushed amount is ΔH = HS (H is the total height of the tube 1).
Thereafter, the hollow tube 1 is pulled from the pull gauge 35, and the tension when the hollow tube 1 is pulled out between the take-up belts 31c and 32c is measured. To do.

また、図８は上記測定結果を示すグラフで、横軸は潰し量ΔＨ（ｍｍ）、縦軸は引き出
し張力Ｔ（ｋｇｆ）である。
上記単管チューブは接触面積が最も小さい中空のチューブで、上記９連チューブは接触
面積が最も大きい中空のチューブである。また、上記６連チューブは穴の割合が最大の中
空のチューブである。この接触面積に対応する幅Ｗは一例として概略９連チューブが２９
ｍｍ、６連チューブが２１．５ｍｍ、５連チューブが１３．２ｍｍ、４連チューブが１７
．５ｍｍ程度である。
図８のグラフに示すように、潰し量ΔＨが大きくなるに従って中空のチューブの引き出
し張力Ｔも大きくなる。潰し量ΔＨが１．５ｍｍ以上では、いずれの中空のチューブの引
き出し張力Ｔも張力限界値である１０ｋｇｆを超えていることが分かる。
これにより、潰し量ΔＨが１．５ｍｍ以上であれば、引取機３０の引き出し張力が張力
限界値である１０ｋｇｆを超えることができることが確認された。
また、上記グラフからは、潰し量ΔＨが１．４ｍｍのときに引き出し張力Ｔは１０ｋｇ
ｆを超えているので、ベルト有効長さとしては、実験した４２５ｍｍよりも短い４００ｍ
ｍであっても、十分な引き出し張力を得ることができると考えられる。
また、単管チューブ、９連チューブ、６連チューブは、いずれも潰し量ΔＨを１．５ｍ
ｍ以上にすることで、引き出し張力を張力限界値である１０ｋｇｆを超えることができる
ことが確認された。
更に、図８のグラフから、潰し量ΔＨが１．０ｍｍ〜３ｍｍの間では、同じ引き出し張
力Ｔを得るための潰し量ΔＨは、接触面積の最も大きい９連チューブの方が小さいことが
わかる。具体的には、Ｔ＝１２ｋｇｆを得るための潰し量ΔＨは、６連チューブではΔＨ
＝２．３ｍｍ、９連チューブではΔＨ＝２．１ｍｍ、である。これにより、同じ引き出し
張力Ｔを得るための潰し量ΔＨとしては、連数の大きいものの方が小さいものよりも若干
小さくなるように設定してもよいことが確認された。
なお、上記グラフでは、単管チューブよりも接触面積の大きな６連チューブの方が単管
チューブよりも同じ引き出し張力Ｔを得るための潰し量ΔＨが大きくなっているが、これ
は、上記６連チューブの穴の割合が単管チューブよりも大きいことによるものと考えられ
る。 Table 1 below shows the results of measuring the pulling tension T for various hollow tubes having different crushing amounts ΔH.
The hollow tubes used in the experiment are as follows.
Single tube; H = 4.8 mm, D = 2.0 mm, (D / H = 0.42)
6 continuous tubes; H = 5.6 mm, D = 3.0 mm, (D / H = 0.54)
Nine tubes; H = 4.4 mm, D = 2.2 mm, (D / H = 0.50)

FIG. 8 is a graph showing the measurement results, in which the horizontal axis is the crushing amount ΔH (mm), and the vertical axis is the pulling tension T (kgf).
The single tube is a hollow tube having the smallest contact area, and the nine-tube is a hollow tube having the largest contact area. The 6-tube is a hollow tube having the largest hole ratio. As an example, the width W corresponding to this contact area is approximately 29 for a 9-tube.
mm, 61.5 tube is 21.5 mm, 5 tube is 13.2 mm, 4 tube is 17
. It is about 5 mm.
As shown in the graph of FIG. 8, the pulling tension T of the hollow tube increases as the crushing amount ΔH increases. It can be seen that when the crushing amount ΔH is 1.5 mm or more, the pulling tension T of any hollow tube exceeds the tension limit value of 10 kgf.
Thus, it was confirmed that the pulling tension of the take-up machine 30 can exceed the tension limit value of 10 kgf if the crushing amount ΔH is 1.5 mm or more.
Further, from the above graph, the pulling tension T is 10 kg when the crushing amount ΔH is 1.4 mm.
Since it exceeds f, the effective belt length is 400 m shorter than the experimental 425 mm.
Even with m, it is considered that a sufficient pulling tension can be obtained.
In addition, the single tube, the 9 tube, and the 6 tube all have a crushing amount ΔH of 1.5 m.
It was confirmed that the pulling tension can exceed the tension limit value of 10 kgf by setting it to m or more.
Furthermore, it can be seen from the graph of FIG. 8 that when the crushing amount ΔH is between 1.0 mm and 3 mm, the crushing amount ΔH for obtaining the same pulling tension T is smaller for the 9-tube having the largest contact area. Specifically, the amount of crushing ΔH to obtain T = 12 kgf is ΔH for a 6-tube.
= 2.3 mm, ΔH = 2.1 mm for a 9-tube. Thus, it was confirmed that the crushing amount ΔH for obtaining the same pulling tension T may be set so that the one with a larger number of stations is slightly smaller than the one with a smaller number.
In the graph, the 6-tube having a larger contact area than the single tube has a larger crushing amount ΔH for obtaining the same pulling tension T than the single tube, but this indicates This is considered to be due to the fact that the ratio of the hole of the tube is larger than that of the single tube.

Thus, according to the best mode, in the take-up machine 30 that takes out the hollow tube 1 continuously extruded by the extruder 10 and cooled by the cooler 20, the hollow tube 1 is used.
The belt gap amount S, which is the dimension of the gap between the lower belt surface of the take-up belt 31c and the upper belt surface of the take-up belt 32c, is adjusted, and the crushing amount ΔH of the hollow tube 1 is adjusted. = H-S (H is the total height of the tube 1) is set to approximately 1.5 mm or more so that the tube pulling tension of the take-up machine exceeds the tension limit value of 10 kgf, so that the effective belt length is 400 mm. Even with the take-up machine 30 set as short as ˜425 mm, it is possible to stably apply the necessary drawing tension to the hollow tube.
Further, as the number of hollow tubes 1 is increased, the amount of crushing ΔH at the same tension is set to be slightly smaller than that having a small number of stations, so that the hollow tube 1 can be hollowed without applying unnecessary stress. Therefore, the quality of the hollow tube can be improved.

In addition, although the above-mentioned best form does not show the experimental result about other forms of tubes, such as a quadruple tube, by making the crushing amount ΔH of the take-up machine 30 about 1.5 mm or more, It is fully expected that the tube pull-out tension of the tube can exceed the tension limit value of 10 kgf.
In the above example, the screw insertion type lifting device is used as the lifting device.
Other devices such as a rack and pinion type lifting device may be used as long as the size of the gap between the belt surface of 1c and the belt surface of the take-up belt 32c can be accurately set.

Thus, according to the present invention, it is possible to obtain a small take-up machine that can stably apply the necessary pull-out tension to the hollow tube to be taken, so that the production line can be simplified, Work space can be secured.

It is a figure which shows the manufacturing apparatus of the extrusion-molded tube by this invention. It is a figure which shows an example of the hollow tube which concerns on this invention. It is a figure which shows the example which applied the hollow tube to the ink tube of the printer. It is a figure which shows one structural example of a head die. It is a figure for demonstrating the attachment method of a head die. It is a figure which shows the relationship between a belt space | interval and a crushing amount. It is a figure which shows the experimental method for investigating the relationship between the amount of crushing and tension | tensile_strength. It is a figure which shows the relationship between crushing amount and tension | tensile_strength. It is a figure which shows schematic structure of the conventional extrusion molding apparatus.

Explanation of symbols

1 hollow tube,
10 Extruder, 11 Hopper, 12 Cylinder, 13 Screw,
14 Extrusion head, 15 Head die, 20 Cooling machine, 21 Cooling water,
22 Cooling tank, 22a Water supply port, 22b Drain port, 22c Tube introduction port,
22d tube outlet, 23 cooling water supply device,
30 take-up machine, 31 first belt device, 31a, 32a driving roller,
31b, 32b driven roller, 31c, 32c take-up belt,
31M, 32M reduction motor, 32 second belt device, 33 lifting device,
33a upper support member, 33b lower support member, 33c rod-shaped screw member,
33d female thread part, 33m guide hole, 33n guide rod, 33k support hole,
33h Handle, 34 base, 35 pull gauge.

Claims (4)

In the method for producing an extruded tube, after cooling the extruded hollow tube, it has a predetermined belt effective length and is taken up by a take-up machine having a belt gap amount of a predetermined dimension.
A method for producing an extruded tube, wherein the tube crushing amount of the take-up machine is set to approximately 1.5 mm or more so that the tube draw-out tension of the take-up machine exceeds a tension limit value of 10 kgf. 2. The method for producing an extruded tube according to claim 1, wherein the extruded hollow tube is a 9-tube, a 6-tube, a 4-tube or a single tube. 2. The extruded tube according to claim 1, wherein the amount of crushing at the same tension is set to be slightly smaller than that of the smaller number of consecutive tubes of the extruded hollow tube. Manufacturing method. In an apparatus for manufacturing an extruded tube, after cooling an extruded hollow tube, a take-up machine having a predetermined belt effective length and having a belt gap amount of a predetermined dimension,
An apparatus for manufacturing an extruded tube, wherein the tube crushing amount of the take-up machine is approximately 1.5 mm or more so that the tube drawing-out tension of the take-up machine exceeds a tension limit value of 10 kgf.

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