JP2011116024A - Method for manufacturing resin tube with inner peripheral surface treated - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a resin tube with the inner peripheral surface treated so that folding of both edges of the tube can be prevented thoroughly and a treatment of the inner peripheral surface can be carried out uniformly and smoothly with the treating solution, in treating the inner peripheral surface of a target resin tube, especially a resin tube made of a fluororesin, with a treating solution. <P>SOLUTION: The method for manufacturing a resin tube with the inner peripheral surface treated includes treating the inner peripheral surface of the tube 1 in the treating solution, in order, by arranging one or more inserts 2 within the target tube 1, forming an insert holding means 3 for holding the inserts 2, forming a liquid reservoir P for the treating solution in a space above the inserts 2 arranged within the tube 1 and moving at least one of the tube 1 and the inserts 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

In the present invention, by treating the inner peripheral surface with a treatment liquid (for example, a sodium-liquid ammonia-based treatment liquid or a sodium-naphthalene-based treatment liquid), the properties of the inner peripheral surface (for example,
The present invention relates to a method for producing a resin tube (particularly a fluororesin tube) having improved wettability and adhesion to other materials. In particular, the present invention relates to a method for producing an optimal resin tube as a tube-like cover member used for fixing or transfer rolls or belts because there is no crease at the ends of both ears and there is no waist fold (fold). Is.

(Introduction)
The tube made of fluororesin has excellent heat resistance, chemical resistance, non-adhesive properties, etc., so it is ideal for cover materials that are fitted into the heat fixing roller of an electronic copying machine and integrated with the cover. is there. However, since the fluororesin tube has poor adhesion to the heat fixing roller, the inner peripheral surface of the fluororesin tube must be processed so that the necessary adhesive force can be exhibited. For this reason, various ideas as described below have been made.

(Pinch roll pinching method)
In claim 1 of Japanese Patent Laid-Open No. 5-59195 (Patent Document 1), the surface treatment liquid 7 is injected from the opening end 2 of the tube 1 into the fluororesin tube 1 provided with the blocking portion 5. A method is shown in which the inner peripheral surface of the tube 1 is processed by moving the contact portion between the inner peripheral surface of the tube and the treatment liquid 7 by storing the upper portion and moving the blocking portion 5 in the vertical direction. . Here, the closing portion 5 is specifically a portion that is closed by being pinched by a pair of pinch rolls (or pinch boards) 10 and 10 (claim 3). It should be noted that FIG.
The mandrel 3 shown in FIG. 1 is attached to the upper open end 2a of the tube 1 and its upper open end 2a.
Are pinch rolls 10 for forming the closing part 5.
It has nothing to do with 10.

(S-shaped pressing method with a pair of rollers)
According to claim 1 of JP-A-2006-241313 (Patent Document 2), the tube 12 is provided with a closing portion 18 by pressing the side portion of the tube 12 with a pair of rollers 24, 24, and the closing portion The inner peripheral surface of the tube that injects a surface treatment liquid into the tube 18 and moves the position of the blocking portion 18 by moving the tube 12 or the rollers 24, 24 up and down to surface-treat the inner peripheral surface of the tube 12 In the processing apparatus, one of the rollers 24 is pressed in one direction against the tube 12, and the other roller 24 is arranged to press in the other direction at a position different from the pressing position. A tube inner peripheral surface treatment apparatus is shown.

The method of Patent Document 2 states that “the inner surface treatment tube according to the method of Patent Document 1 has a crease at the ends of both ears. Therefore, when the inner surface treatment tube is used as a cover material for a heat fixing roller, In other words, it is inevitable that a concave crease is generated on the outer surface of the cover material ”. Therefore, in this Patent Document 2, by finding the method of pressing the tube in an S shape by shifting the position of one roller and the other roller during the inner peripheral surface treatment, The goal is to avoid such creases.

(Two-point blockage processing bandwidth method)
JP-A-4-288348 (Patent Document 3), JP-A-10-60139 (Patent Document 4), JP-A-11-279301 (Patent Document 5), JP-A-11-302414
In the publication (Patent Document 6), a tube is closed at two or more points by a blocking member (pinch roll) to form a treatment zone, and the inner surface of the tube is treated with a treatment liquid enclosed in the treatment zone. The scheme is shown.

(Method of pressing to the extent that there is no crease between two sandwich members)
In Japanese Patent Application Laid-Open No. 2006-291083 (patent document 7) according to the applicant's application, the tube 1 is sandwiched between two sandwiching members 2 and 20 and pressed to such an extent that the ends of both ears are not creased. Then, the cross-sectional area inside the tube perpendicular to the flow direction of the processing liquid is reduced by being elastically deformed into a flat shape, and in this state, the fluororesin thin tube is made to inject the processing liquid into the tube 1 and flow down. An internal treatment method is shown.

JP-A-5-59195 JP 2006-241313 A JP-A-4-288348 Japanese Patent Laid-Open No. 10-60139 JP 11-279301 A JP-A-11-302414 JP 2006-291083 A

(Problems of conventional technology)
Among the above-mentioned patent documents, the methods of Patent Documents 1 and 3-6 concerning the pinching method using the pinch roll can be smoothly performed on the inner peripheral surface of the fluororesin tube, but are sandwiched between the pinch rolls. The crease marks are transferred when this inner peripheral surface treated tube is used as a protective cover that covers the fixing roll of an electronic copying machine. There is a point.

As for the phenomenon that creases are formed at both ear ends of the inner peripheral surface treatment tube in this way, and the phenomenon and problems when such an inner peripheral surface treatment tube is used as a cover material for a heat fixing roller, patents It is explained in detail with reference to the graph of Table 2 in Reference 2.
This point is also mentioned in paragraph 0007 of Patent Document 7.

And in order to eliminate said problem based on the crease | fold of the both-ears end of a tube, as already stated, in patent document 2, the position of one roller and the other roller is shifted and the tube is pressed in S shape. Special measures are taken. In Patent Document 7, the tube is sandwiched between two sandwiching members and pressed to such an extent that no creases are formed at the ends of both ears. Special measures are taken to reduce the inner cross-sectional area.

However, even with the contrivance of Patent Document 2, there is a limit that it is not easy to make the flow rate of the treatment liquid constant throughout the entire circumference of the tube when the S-shaped press is performed, and that the crease cannot be completely prevented. Further, even by the device of Patent Document 7, it is difficult to completely eliminate the drift of the processing liquid when the tube is sandwiched between the two sandwiching members. Therefore, it is desirable in terms of uniform processing of the inner peripheral surface of the tube. There was a limit that the goal could not be fully achieved.

(Object of invention)
In the present invention, when the inner peripheral surface of a resin-treated tube (especially a fluorine-based resin-treated tube) is treated with the treatment liquid, the ends of both ends of the tube are creased. It is an object of the present invention to provide a “method for producing a resin-made tube with an inner peripheral surface treatment” in which the inner peripheral surface treatment with the treatment liquid is completely and smoothly performed.

The manufacturing method of the resin tube in which the inner peripheral surface of the present invention is treated is as follows.
Placing one or more interposers (2) inside the plastic tube (1);
At this time, the gap between the outer peripheral portion of the maximum diameter portion of the insert (2) and the inner peripheral surface of the tube to be processed (1) prevents passage of the processing liquid (p) described later or the processing liquid. (p) to the extent that a liquid film is formed,
Interpolated body holding means (3) for holding the inserted body (2) disposed inside the treated tube (1).
),
In the space above the insert (2) placed inside the tube (1) to be processed, or between two inserts (2) and (2) placed in the tube (1) In the space, a pool of processing liquid (p) (P
)
In this state, the inner peripheral surface of the tube to be processed (1) is sequentially treated with the processing liquid (p) by moving at least one of the tube to be processed (1) and the insert (2). thing,
It is characterized by.

According to the present invention, the following excellent effects can be achieved in the treatment of the inner peripheral surface of a resin-treated tube (particularly a fluororesin-treated tube) with a treatment liquid.
-It is possible to completely prevent creases at both ear ends of the inner peripheral surface treatment tube.
-Since there is no crease at the ends of both ears in this way, uniform processing is performed over the entire inner peripheral surface of the tube.
-As described above, the inner peripheral surface treated tube manufactured according to the present invention has no creases at both ear ends, and the inner peripheral surface is formed into a uniform treated surface in terms of wettability and adhesiveness. Therefore, it has good interlayer adhesion when it is used as a cover material for a heat fixing roller, for example, and even if printing is performed by an electronic copying machine using a heat fixing roller covered with the cover material, Since troubles such as a streak pattern do not occur, the quality of printing can be ensured. In addition, there is no situation where the tube breaks during the processing operation, so that a “fold” occurs in the tube.
In addition, according to the present invention, it is easy to continuously perform the inner peripheral surface treatment of the tube with the treatment liquid and the washing treatment with the cleaning liquid, and the tube extruded from the die of the extruder can be cooled. It can also be used as it is for the inner peripheral surface treatment.
As described above, the present invention is extremely advantageous as an industrial manufacturing method of a resin tube having an inner peripheral surface treated, and the quality of a product obtained by adopting the manufacturing method is excellent.

  Hereinafter, the present invention will be described in detail.

(Resin tube (1))
As the tube to be treated (1), not only a single layer but also a multi-layer tube can be used (in the case of a multi-layer, a layer other than the resin layer may be included). The material of the resin layer constituting the tube to be treated (1) is arbitrary, but since the fluorine resin is particularly important, the resin treated tube (1) will be treated with a tube made of fluorine resin in the following. The explanation is centered on the case of (1).

As the above-mentioned fluororesin,
・ PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer)
・ FEP (tetrafluoroethylene / hexafluoropropylene copolymer)
・ PTFE (polytetrafluoroethylene)
EPE (tetrafluoroethylene / hexafluoropropylene-perfluoroalkoxyethylene terpolymer)
・ ETFE (tetrafluoroethylene / ethylene copolymer)
・ ECTFE (ethylene / chlorotrifluoroethylene copolymer)
・ PCTFE (polychlorotrifluoroethylene)
・ PVDF (polyvinylidene fluoride)
・ PVF (polyvinyl fluoride)
Etc. Of these, PFA is particularly important, followed by FEP and PTFE.
And is important.

The film thickness, diameter (or folding diameter), and length of the tube to be treated (1) can be arbitrarily designed according to the application. For example, in the normal case, it is often set as follows. However, depending on the application, it can be greatly deviated from the following range.
The film thickness is not particularly limited, but is usually 5 to 500 μm, preferably 10 to 10 μm.
It is often 300 μm, particularly preferably 10 to 200 μm, more preferably 15 to 150 μm.
-Although there is no particular limitation on the diameter, it is usually 5 to 500 mm, preferably 10 to 4
It is often set to 00 mm, particularly preferably 10 to 350 mm.
・ The length is 0.25m when using a pre-determined length of tube (1).
In many cases, the length is from about 10 m to about 10 m, but a longer one can be used if there is a margin in the height and area of the manufacturing site. Moreover, according to the present invention, it is possible to perform the inner peripheral surface treatment while forming the tube by melt extrusion, and in this case, there is no upper limit to the length of the tube to be treated (1).

(Treatment liquid (p))
As the treatment liquid (p), any treatment liquid can be used as long as it meets the purpose of treating the inner peripheral surface of the resin treatment tube (1). Tube (1)
The following treatment liquids 1 and 2 are particularly important when the inner peripheral surface is processed.
1. Alkali metal-liquid ammonia type treatment liquid (particularly, a treatment liquid consisting of a solution of sodium dissolved in liquid ammonia)
2. Sodium-Naphthalene-Organic Solvent Treatment Solution

(Placement of the insert (2) inside the tube (1) to be processed)
In the present invention, an inserted body (2) (two or more inserted bodies (2) or a multiple-type inserted body (2) may be used as will be described later) inside the tube to be treated (1). ). And the interpolation body at that time
The gap between the outer peripheral portion of the maximum diameter portion of (2) and the inner peripheral surface of the tube to be processed (1) is the processing liquid described later.
It is set so as to prevent passage of (p) or to form a liquid film of the treatment liquid (p). A slight flow or leakage of the processing liquid (p) from the liquid pool (P) described later will not cause any problem, but if the gap is too wide, the processing liquid (p) stored in the liquid pool (P) ) Has the following disadvantages because the amount of leakage increases.
(I) When the processing of one tube to be processed (1) is performed without replenishing the processing liquid (p), an unprocessed portion may remain.
(Ii) If it is assumed that the processing solution (p) is replenished during the processing operation, the processing solution
It may be necessary to replenish (p) more frequently than expected.

(Interpolated body (2))
The shape of the insert (2) is arbitrary as long as the object of the present invention can be achieved,
For example, a torpedo shape, a shell shape, a barrel shape, a cylindrical shape, a cylindrical shape, a rugby ball shape, a spherical shape, a dumbbell shape, and the like can be used. It is also preferable that the front end side and the rear end side of the insert (2) are formed as a cusp or a round head. The cross-sectional shape in the width direction of the tube to be processed (1) of the insert (2) is usually a circle, but may be an ellipse or a similar shape. The insert (2) may be hollow or solid. When the insert (2) is hollow, a weight may be inserted into the hollow portion to adjust the weight.

As for the material of the insert (2), at least the surface side should be selected so that it is not affected by the treatment liquid (p) described above, and the strength, durability, wear resistance, weight, etc. should be considered. Put in. When the tube to be treated (1) is a fluororesin tube and the treatment liquid (p) is, for example, the above-mentioned “sodium-liquid ammonia” solution or “sodium-naphthalene” solution, the The material on at least the surface side of the body (2) is preferably a metal material such as stainless steel, a resin material such as polyolefin, or a ceramic material.

The insert (2) preferably has a structure in which a seal ring (liquid sealing ring) (2a) is fixedly or detachably provided on the body. That is, the portion that becomes the maximum diameter portion of the insert (2) is constituted by the seal ring (2a). With this configuration, the tube to be processed
When the inner surface of (1) is treated, the seal ring (2a) portion of the insert (2) is in contact with or close to the inner peripheral surface of the tube to be treated (1). It is easy to set the material and dimensional accuracy to the optimum values compared to the body part of the insert (2). Seal ring (1
When a) is detachable, it is advantageous in terms of cost because only the seal ring (1a) needs to be replaced when the time for replacement of the insert (2) is reached.

(Placement of the interpolated body (2) in the treated tube (1))
In addition to Method 1 (“A”) in which one interposer (2) is placed inside the tube to be treated (1),
・ Method 2 in which two or more inserts (2) are arranged at intervals inside the tube (1)
("A A" or "A A A"),
・ Method 3 of placing multiple inserts (2) (with two or more inserts (2) connected) inside the tube to be processed (1)
("AA" or "AAAA"),
・ Method 4 combining these methods as appropriate
("A A-A" and "A A-A A")
Can also be adopted.

Methods 2, 3, and 4 can ensure the treatment of the inner peripheral surface of the tube to be treated (1) with the treatment liquid (p), and the treatment of the tube to be treated (1) in the vertical direction or diagonally up and down direction. Therefore, it is possible to perform in the horizontal direction or a direction close to the horizontal, so it should be considered as a design option for the inner peripheral surface processing.

This is because, by designing the number of interposers (2) to be placed inside the tube (1) to be processed and the multiple structure, the tubes (1) are separated by the interposers (2). A plurality of processing spaces can be formed, and at least one of the processing spaces can form a liquid pool (P) of the processing liquid (p) and the remaining space can be formed. This is because it is possible to form a liquid pool (W) of the cleaning liquid (w) in at least one of the above. In other words, the tube after the treatment with the treatment liquid (p) can be continuously washed with the washing solution (w).

(Interpolated body holding means (3))
The insertion body (2) cannot be positioned only by inserting and arranging the insertion body (2) inside the treated tube (1). Therefore, it is necessary to provide an interpolating body holding means (3) for holding the interpolating body (2).

The insertion body (2) disposed inside the tube (1) to be processed can be held by the insertion body holding means (3) as follows.

-1-
One of the holding methods is to arrange the insert holding means (3) on the “outside” of the tube to be processed (1), and to insert the insert holding means (3) and the insert (2). In this method, contact is made through the treatment tube (1). The contact at this time may be any of a planar contact, a linear contact, and a point-like contact between the two through the tube to be treated (1). It is more advantageous to do so.

-2-
Another one of the holding methods is that the interposer holding means (3) is arranged on the “outside” of the tube to be processed (1), and the interposer holding means (3), the insert (2), Is magnetically attached by a magnetic force through the tube (1) to be processed. At this time,
A mode in which magnets (M) are installed on both the interposer (2) and the interpolator holding means (3) to use the magnetizing force between the S and N poles;
・ A magnet (M) is installed on either the insert (2) or the insert holding means (3) and a magnetic body (m) is installed on the other side, or the other is composed of a magnetic body (m). Embodiment to
・ A magnet (M) and a magnetic body (m) are installed at different positions on the insert (2), and a magnet (M) and a magnetic body (m) are installed at different positions on the insert holding means (3). A mode in which the former and the latter are magnetized between the magnet (M) and the magnetic body (m),
Any of these can be adopted.

-3-
Still another holding method is a method in which the insert holding means (3) inserted from the “open end” of the tube (1) to be processed is connected to the insert (2). The connection at this time can be performed using a linear body such as a column, a rod, a wire, a wire, a narrow tape, a thread, or a string.
If the linear body is flexible, the tube (1) to be treated may be arranged in the vertical direction so that the insert (2) is suspended from the upper “open end”.

(Arrangement of treated tube (1))
The arrangement direction of the tube to be processed (1) at the time of processing operation is not limited to the case where the length direction is the vertical direction, but may be an oblique direction or a horizontal direction. Such flexibility is one of the features of the present invention.

(Formation of liquid pool (P) of treatment liquid (p))
-1-
Place the tube to be treated (1) vertically or diagonally, and
When adopting the placement method 1 in which one insert (2) is inserted and placed inside the tube,
A liquid pool (P) of the processing liquid (p) is formed in the space above the insert (2) disposed inside (1).

-2-
Arrangement method 2 in which two or more interposers (2) are arranged at intervals inside the tube to be treated (1),
Arrangement method 3 in which multiple-type inserts (2) (with two or more inserts (2) connected) are arranged inside the tube to be processed (1), or these methods 1 and 2 3 is appropriately combined, the arrangement direction of the tube to be processed (1) can be set in any direction, so that the interpolated body arranged inside the tube to be processed (1) In the space above (2) or in the space between two or more inserts (2) and (2) placed inside the tube to be treated (1), a liquid pool (P) Can be formed.

By adopting the above-mentioned arrangement method -2-, when a plurality of processing spaces separated by the insert (2) are formed in the tube to be processed (1), It is possible to form a liquid pool (P) of the processing liquid (p) in at least one and form a liquid pool (W) of the cleaning liquid (w) in at least one of the remaining spaces.

(Treatment of inner surface of tube (1) to be treated)
In this state, the inner peripheral surface of the tube to be processed (1) is sequentially treated with the processing liquid (p) by moving at least one of the tube to be processed (1) and the insert (2). . A fluorine-based resin tube whose inner peripheral surface is treated is manufactured smoothly.

-Batch processing method-
At this time, the treatment tube (1) is treated with the treatment liquid (p) by using the treatment tube (1) cut to a predetermined length, and the inner peripheral surface of the treatment tube (2) is sequentially applied to the treatment tube (1). This can be done by treating with the treatment liquid (2).

-Continuous processing method-
Further, the treatment of the treated tube (1) with the treatment liquid (p) can also be performed by a continuous treatment method. For example, the extrusion process and the inner peripheral surface treatment step can be performed continuously by cooling the tube extruded from the die of the extruder and directly subjecting the tube to the inner peripheral surface treatment.

(Cleaning with cleaning solution (w))
After the inner peripheral surface of the tube to be treated (1) is treated with the treatment liquid (p) as described above, the washing treatment is usually performed with the washing liquid (w) continuously or in another step. Cleaning liquid (w)
The appropriate one is used depending on the processing solution (p) used. Examples of the cleaning liquid (w) are water, alcohols, polyhydric alcohols, ketones, ethers, esters, hydrocarbons and the like. Cleaning is often performed in multiple stages.

As mentioned above, a plurality of processing spaces separated by the interposer (2) are formed in the tube to be processed (1), and a processing liquid (at least one of the processing spaces ( p) and a cleaning liquid (w) pool (W) in at least one of the remaining spaces, the tube after treatment with the processing liquid (p) Cleaning with the cleaning liquid (w) can be performed continuously.

  The following examples further illustrate the invention.

Example 1
FIG. 1 is an explanatory view showing an example of the production method of the present invention.
FIG. 2 is a cross-sectional view of the interposer (2) of FIG. 1, with a front view on the right half and a side view on the left half.

−Tube (1) −
The tube (1) made of fluororesin has a diameter (inner diameter) of 38.2 mm and a thickness of 30 μ made of PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer).
A tube of m was cut to a length of 2 m was prepared.

− Interpolated body (2) −
A torpedo shaped insert (2) having the shape and structure shown in FIGS. FIG.
The right half of the figure is a view rotated 90 ° with respect to the left half. The upper end side of the cylindrical body is formed in a conical shape, and the lower end side of the body is formed in a diaphragm shape. The inside is hollow. A seal ring (2a) is fitted on the body of the body of the insert (2). Interpolant (2)
The outer diameter of the seal ring (2a) is 38 mm. In addition, (g) of the lower end side of the left half of FIG. 2 is a hollow (not a through hole). The body of the insert (2) and the seal ring (2a) are made of a metal or polyethylene that is not affected by the processing liquid (p) described later.

− Interpolation holding means (3) −
As shown in FIG. 1, the insert (2) is held by the roller-shaped freely rotatable insert holding means (3), (3) on the lower end side. 2) By inserting the shape of the transition part from the body part to the lower end side depression (g) and the degree of the depression (g),
Care should be taken so that the tube (1) is not “folded” so that the transition part of the insert (2) to the recess (g) is slightly caught on (3) and (3).

-Treatment of inner surface of tube (1)-
The tube to be treated (1) is set so that its longitudinal direction is in the vertical direction, and the insert (2) is inserted into the tube to be treated (1). The insert holding means (3) for holding (2) is disposed outside the tube (1) to be processed. Although not shown, a base may be fitted to the upper end of the tube to be treated (1) for filling with the treatment liquid (p), maintaining the tube shape, and lifting the tube upward. it can. Treated tube (1
) Can be pulled upward by, for example, a roll method or a chucking method.

Next, the space above the insert (2) of the tube to be treated (1) is filled with 100 ml of a treatment liquid (p) made of a solution of sodium dissolved in liquid ammonia to form a liquid pool (P). I let you. In this state, by pulling up the tube to be treated (1) upward (it is also possible to pull down the interposer holding means (3)), the inner peripheral surface of the tube (1) is The treatment was sequentially performed with the above treatment solution (p).

-Cleaning treatment-
In the fluororesin tube with the inner peripheral surface treated in this way, no “folds” were observed at the “both ear ends”. In addition, there is no step of pressing the tube in the diametrical direction as in the conventional pinching method using a pinch roll, so that the tube breaks down.
There was no occurrence of a “break”. Although the inner peripheral surface is colored light brown by the above treatment, the colored state is extremely uniform over the entire inner peripheral surface, and no coloring unevenness was observed.

Example 2
3A and 3B are explanatory views showing another example of the production method of the present invention. In addition, FIG.
The left half of A) is a cross-sectional view taken along line A-O in FIG. 3 (B), and the right half of FIG. 3 (B) is B-O in FIG. 3 (B).
It is line sectional drawing.

In the second embodiment, the magnetic body (m) is inserted into the insert (2) disposed inside the tube (1) to be processed.
) (For example, SUS630) is installed, and the interposer holding means (3) ((3a)) made of the magnet (M) is arranged outside the processing tube (1) so as to face the magnetic body (m). As a result, the insertion body (2) is held through the tube (1) by the magnetic force between the magnetic body (m) and the magnet (M) (
Positioning in the Z-axis direction) is performed. Further, by providing four insert holding means (3) ((3b)) composed of rollers facing the insert (2) from the outside of the tube (1), the tube to be processed (1 ) To hold the insert (2) (positioning in the X-axis and Y-axis directions).

Example 3
FIG. 4 is an explanatory view schematically showing another example of the production method of the present invention.
In the third embodiment, as shown in FIG. 4, the insertion body is inserted from the outside of the treated tube (1).
(2) is provided with a roll-shaped insert holding means (3), and the insert holding means (3) inserted from the opening end of the tube to be processed (1) is attached to the insert (2). By connecting, its interpolated body (2
), The inner peripheral surface of the tube to be processed (1) is treated with the treatment liquid (p) filled in the space above. (P) is a pool of the processing liquid (p).

Example 4
FIG. 5 is an explanatory view schematically showing another example of the production method of the present invention.
In Example 4, as shown in FIG. 5, two inserts (2) and (2) are arranged in the tube (1) to be processed with a space therebetween, and the tube (1) A roll-shaped insert holding means (3) is provided facing each insert (2) from the outside, and the space filled between the inserts (2) and (2) is filled. The inner surface of the tube to be treated (1) is treated with the liquid (p), and the cleaning liquid (w) filled in the space above the upper insert (2) is continuously cleaned. It is. (W) is a pool of cleaning liquid (w).

Example 5
FIG. 6 is an explanatory view schematically showing another example of the production method of the present invention.
In the fifth embodiment, as shown in FIG. 6, a triple insertion body (2), (2), (2) is arranged on the lower side of the tube (1) to be processed. Each insert (2) from the outside of the tube (1)
A roll-shaped interposer holding means (3) is provided opposite the two, and the lower two interposers (2), (2)
The inner peripheral surface of the tube to be processed (1) is treated with the treatment liquid (p) filled in the space between the two, and the second and third inserts (2) and (2) from the bottom continue. Space and third insert from the bottom
The treated tube (1) after the treatment is washed in two stages with the washing liquid (w) filled in the upper space of (2). (P) is a pool of the processing liquid (p), and (W) is a pool of the cleaning liquid (w).

Example 6
FIG. 7 is an explanatory view schematically showing another example of the production method of the present invention.
The mandrel method in extrusion molding is a method of sizing by attaching a mandrel for sizing inside a mold and cooling with water or air from the outside when a pipe passes through the surface of the mandrel. In Example 7, the tube melt-extruded from the die (4) of the extruder passes through the inside mandrel (5) and the take-up roll (6), and then the tube to be treated (1)
In addition, a double-type insert (2), (
2) The tube to be treated (1) with the treatment liquid (p) filled in the space between (held from the outside of the tube to be treated (1) by the positioning roll as the insert holding means (3)) The inner peripheral surface is processed. This method is advantageous in that continuous processing of the tube to be processed (1) is possible and inner surface processing in the horizontal direction of the tube to be processed (1) can be performed.

The resin tube manufactured in accordance with the present invention and processed on the inner peripheral surface can be used in various applications. Among them, in particular, a fluororesin tube having an inner peripheral surface treated is extremely useful as a tube-shaped cover member used for fixing or transferring rolls or belts in electronic copying machines.

It is explanatory drawing which showed an example of the manufacturing method of this invention. It is sectional drawing of the insertion body (2) of FIG. 1, and the front view is drawn on the right half and the side view is drawn on the left half. It is explanatory drawing which showed another example of the manufacturing method of this invention. It is explanatory drawing which showed typically the other example of the manufacturing method of this invention. It is explanatory drawing which showed typically the other example of the manufacturing method of this invention. It is explanatory drawing which showed typically the other example of the manufacturing method of this invention. It is explanatory drawing which showed typically the other example of the manufacturing method of this invention.

(1)… tube to be treated, (1a)… melt,
(2) ... Interpolated body, (2a) ... Seal ring, (g) ... Recess,
(3), (3a), (3b) ... insertion body holding means,
(4) ... extruder die,
(5)… Inside mandrel,
(6)… take-up roll,
(p)… treatment liquid, (P)… treatment liquid (p) pool,
(w)… cleaning solution, (W)… reservoir (w) pool,
(M) ... magnet, (m) ... magnetic material

Claims (5)

Placing one or more interposers (2) inside the plastic tube (1);
At this time, the gap between the outer peripheral portion of the maximum diameter portion of the insert (2) and the inner peripheral surface of the tube to be processed (1) prevents passage of the processing liquid (p) described later or the processing liquid. (p) to the extent that a liquid film is formed,
Interpolated body holding means (3) for holding the inserted body (2) disposed inside the treated tube (1).
),
In the space above the insert (2) placed inside the tube (1) to be processed, or between two inserts (2) and (2) placed in the tube (1) In the space, a pool of processing liquid (p) (P
)
In this state, the inner peripheral surface of the tube to be processed (1) is sequentially treated with the processing liquid (p) by moving at least one of the tube to be processed (1) and the insert (2). thing,
The manufacturing method of the resin tube by which the inner peripheral surface was processed characterized by these. The process according to claim 1, wherein the resin-treated tube (1) is a fluororesin tube. The insertion body holding means (3) holds the insertion body (2) arranged inside the treated tube (1). ) Is placed and the insert holding means (3) and the insert (2) are brought into contact with each other via the tube to be processed (1), or (b) the tube to be processed (1) The insert holding means (3) is disposed outside the tube, and the insert holding means (3) and the insert (2) are magnetized by the magnetizing force via the treated tube (1). Or (c) intercalator holding means inserted from the open end of the tube to be treated (1)
The method according to claim 1 or 2, wherein (3) is performed by connecting to the interposer (2). By designing the number of inserts (2) to be placed inside the tube (1) to be processed and the multiple structure, a plurality of tubes (1) separated by the inserts (2) Forming a processing space for
Then, a treatment liquid (p) pool (P) is formed in at least one of the processing spaces, and a cleaning liquid (w) pool (W) is formed in at least one of the remaining spaces. The manufacturing method according to claim 1, wherein the method is formed. 2. The extrusion molding step and the inner peripheral surface treatment step are continuously performed by cooling the tube extruded from the die of the extrusion molding machine and subjecting it to the inner peripheral surface treatment as it is.
Or the manufacturing method of 2.