JP2016117162A - Extrusion molding device, and annular member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion molding device capable of suppressing surface waviness on a surface of an annular member caused due to vibration when a cylindrical resin is cut, relative to cases in which, outer diameter of a contact member is less than 100% of outer diameter of a cooling member, or larger than 102%, and an annular belt formed by using the same.SOLUTION: When a cylindrical resin T is cut by a cutter 50A, vibration occurs on the cylindrical resin T. The vibration which occurs on the cylindrical resin T is absorbed by a contact member 60, and transmission of the vibration to a sizing die 34 is suppressed. Therefore, surface waviness on a surface of annular belt S, is suppressed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an extrusion molding apparatus and an annular member.

  The seamless tube forming apparatus described in Patent Document 1 includes an annular die that extrudes a cylindrical resin (tube), a cooling mandrel that cools the extruded member to form a product inner diameter, and the extruded member to a specified width. And a cutting machine for cutting.

JP 2000-280321 A

  In the configuration described in Patent Document 1, when the extruded cylindrical resin is cut into an annular member, the cylindrical resin vibrates, and this vibration is generated in the portion cooled by the cooling mandrel (cooling mechanism). It is considered that it is transmitted to the cylindrical resin. And a vibration may be produced on the surface of an annular member by transmitting a vibration to the cylindrical resin of the part cooled with the cooling mandrel (cooling mechanism).

  The problem of the present invention is that the annular member produced due to the vibration when cutting the tubular resin, compared to the case where the outer diameter of the contact member is less than 100% or greater than 102% of the outer diameter of the cooling member. It is to suppress surface undulations.

  An extrusion molding apparatus according to claim 1 includes an extrusion mechanism that extrudes thermoplastic resin as a cylindrical resin, a conveyance mechanism that conveys the cylindrical resin extruded by the extrusion mechanism, and a cylindrical resin that is conveyed by the conveyance mechanism. A cooling mechanism having a circular cross-section in contact with the inner peripheral surface, for cooling the cylindrical resin, and cutting for cutting the cylindrical resin cooled by the cooling mechanism from a direction intersecting the conveyance direction of the cylindrical resin A mechanism, a disc shape, disposed between the cooling mechanism and the cutting mechanism in the transport direction, and an outer diameter of 100% to 102% with respect to the outer diameter of the cooling member. A contact member contacting the inner peripheral surface and the outer peripheral surface of the cooled cylindrical resin.

An extrusion molding apparatus according to a second aspect is the extrusion molding apparatus according to the first aspect, wherein an area of the outer peripheral surface of the contact member is 5124 [mm ² ] or less, and Fuji on the outer peripheral surface of the contact member. The coefficient of static friction for Xerox C2 paper is 0.5 or less.

  The extrusion molding apparatus according to claim 3 is the extrusion molding apparatus according to claim 1 or 2, wherein an outer diameter of the contact member is larger than an outer diameter of the cooling member, and the contact member is an inner part of a cylindrical resin. The contact member is elastically deformed so that the outer diameter of the contact member is equal to the outer diameter of the cooling member while being in contact with the peripheral surface.

  An annular member according to claim 4 is formed by the extrusion apparatus according to any one of claims 1 to 3.

  According to the extrusion molding apparatus of claim 1, the outer diameter of the contact member is less than 100% or greater than 102% of the outer diameter of the cooling member, which is caused by vibration when cutting the cylindrical resin. Can be suppressed.

According to the extrusion molding apparatus of claim 2, when the area of the outer peripheral surface of the contact member is larger than 5124 [mm ² ], or when the static friction coefficient with respect to the C2 paper on the outer peripheral surface of the contact member is larger than 0.5 In comparison, it is possible to suppress undulations on the surface of the annular member caused by vibration when cutting the cylindrical resin.

  According to the extrusion molding apparatus of the third aspect, the cylindrical resin can be transported in a stable state as compared with the case where the contact member is not elastically deformed while being in contact with the inner peripheral surface of the cylindrical resin. .

  According to the annular member of claim 4, compared with the formed annular member not using the extrusion molding apparatus according to any one of claims 1 to 3, for example, the annular member is an electrophotographic image. When used in an intermediate transfer belt of a forming apparatus, density unevenness that occurs in an output image can be suppressed.

It is the block diagram which showed the extrusion molding apparatus which concerns on embodiment of this invention. It is drawing which showed the evaluation result evaluated using the extrusion molding apparatus which concerns on the Example of this invention, and the extrusion molding apparatus which concerns on a comparative example with a table | surface. It is the schematic block diagram which showed the whole extrusion molding apparatus which concerns on embodiment of this invention.

  An example of an extrusion molding apparatus and an annular belt (annular member) according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow H shown in the figure indicates the vertical direction of the apparatus (vertical direction), and an arrow W indicates the width direction of the apparatus (horizontal direction).

(overall structure)
The extrusion molding apparatus 10 according to the present embodiment is an apparatus for extruding a thermoplastic resin into a cylindrical shape and cutting it into a round shape. As shown in FIG. 3, a hopper 16, an extruder 18, and a base 24 are used. A sizing mechanism 32, a transport mechanism 42, and a cutting mechanism 50. Furthermore, the extrusion molding apparatus 10 includes a contact member 60 that comes into contact with the inner peripheral surface of the cylindrical resin T extruded into a cylindrical shape.

〔hopper〕
The hopper 16 is a portion into which the pellet-shaped resin P is charged. As shown in FIG. 3, the hopper 16 is connected to a conical portion 16A having an enlarged upper portion and an upper end portion of the conical portion 16A. And a cylindrical portion 16B. The upper portion of the cylindrical portion 16B is opened to the outside, and a pellet-shaped resin P is supplied from here.

(Extruder)
The extruder 18 includes a cylindrical barrel 20 that extends in the apparatus width direction, a screw 22 that is disposed inside the barrel 20 and that conveys the resin P that has been put into the hopper 16 by rotating, and the barrel 20. And a heating device (not shown) for heating the inside.

  In this configuration, the resin P fed into the barrel 20 from the hopper 16 is melted and conveyed while being stirred from one end side (left side in the figure) to the other end side (right side in the figure) of the barrel 20 by the rotating screw 22. It has come to be.

[Base]
The base 24 is connected to the other end side of the barrel 20. The base body 26 of the base 24 is formed with an annular resin flow path 28 into which the molten resin P pushed out from the other end of the barrel 20 by the rotating screw 22 flows downward.

  Further, in the resin flow path 28, an extrusion port 30 is provided on the downstream side in the flow direction of the resin P to push the resin P into a cylindrical shape and push the resin P downward from the base body 26.

  In this configuration, the base 24 is configured to push the resin P melted and stirred by the extruder 18 as a cylindrical resin T to the lower side of the base body 26. And the conveyance mechanism 42 mentioned later conveys the cylindrical resin T. FIG.

  As described above, the extrusion mechanism 12 that extrudes the thermoplastic resin P into a cylindrical shape includes the extruder 18 and the base 24.

[Sizing mechanism]
The sizing mechanism 32 is an example of a cooling mechanism, and is disposed downstream (downward in the drawing) with respect to the base 24 in the transport direction of the cylindrical resin T. The sizing mechanism 32 includes a sizing die 34 having a circular cross section that comes into contact with the inner and outer peripheral surfaces of the molten cylindrical resin T extruded from the extrusion port 30. Further, the sizing mechanism 32 includes a fan 36 that cools the tubular resin T by blowing air to the portion of the tubular resin T that is in contact with the outer peripheral surface of the sizing die 34. The sizing die 34 is an example of a cooling member.

  The sizing die 34 is supported by a support member 38 that extends through the base body 26 in the vertical direction. A plurality of fans 36 are arranged at intervals in the circumferential direction of the sizing die 34 so as to cool the entire tubular resin T.

  In this configuration, the sizing mechanism 32 stabilizes the shape of the cylindrical resin T so that the inner diameter dimension of the cylindrical resin T becomes the design value by cooling the molten cylindrical resin T extruded from the base 24. It is supposed to let you.

[Transport mechanism]
The transport mechanism 42 is disposed on the downstream side (lower side in the drawing) with respect to the sizing mechanism 32 in the transport direction of the cylindrical resin T. The transport mechanism 42 is disposed inside the cylindrical resin T and has a plurality of rollers 44 that are in contact with the inner peripheral surface of the cylindrical resin T, and the opposite side of each roller 44 across the cylindrical wall of the cylindrical resin T. And a plurality of belt devices 46 in contact with the outer peripheral surface of the cylindrical resin T.

  The belt device 46 includes a pair of rollers 46A arranged side by side in the conveying direction (vertical direction) of the cylindrical resin T, and an endless belt 46B wound around the pair of rollers 46A. Further, the transport mechanism 42 includes a motor (not shown) that applies a rotational force to one of the rollers 46A so that the endless belt 46B rotates.

  In this configuration, the cylindrical resin T sandwiched between the roller 44 and the endless belt 46 </ b> B that circulates is applied with a conveyance force that conveys the cylindrical resin T downward by the conveyance mechanism 42.

[Cutting mechanism]
The cutting mechanism 50 is disposed on the downstream side (lower side in the drawing) with respect to the transport mechanism 42 in the transport direction of the cylindrical resin T. The cutting mechanism 50 includes a cutter 50 </ b> A and a drive mechanism 50 </ b> B that reciprocates the cutter 50 </ b> A in a direction that intersects the conveyance direction of the cylindrical resin T (for example, an orthogonal direction).

  In this configuration, the driving mechanism 50B moves the cutter 24A at a predetermined timing so that the cylindrical resin T is cut to a predetermined width, and the annular belt S is formed.

(Contact member)
As shown in FIG. 1, the contact member 60 has a disc shape, and is disposed downstream of the sizing mechanism 32 and upstream of the transport mechanism 42 in the transport direction of the cylindrical resin T. Yes. In other words, the contact member 60 is disposed downstream of the sizing mechanism 32 and upstream of the cutting mechanism 50 in the conveyance direction of the cylindrical resin T. And the outer peripheral surface of the contact member 60 contacts the inner peripheral surface of the cylindrical resin T currently conveyed. Details of the contact member 60 will be described later.

(Overall action)
The operation of the extrusion molding apparatus 10 will be described by the process of forming the annular belt S using the extrusion molding apparatus 10.

  First, the extrusion mechanism 12 extrudes the pellet-shaped resin P as a cylindrical resin T to the lower side of the base body 26 (extrusion process). The extruded cylindrical resin T is transported by the transport mechanism 42.

  Further, the outer peripheral surface of the sizing die 34 comes into contact with the inner peripheral surface of the cylindrical resin T to be conveyed, and the fan 36 blows air onto the cylindrical resin T in the portion in contact with the outer peripheral surface of the sizing die 34. In this way, the sizing mechanism 32 cools the cylindrical resin T, thereby stabilizing the shape of the cylindrical resin T so that the inner diameter dimension of the cylindrical resin T becomes the design value (cooling step).

  Moreover, the outer peripheral surface of the contact member 60 contacts the inner peripheral surface of the cylindrical resin T (contact process).

  Further, the driving mechanism 50B moves the cutter 50A at a determined timing, whereby the cylindrical resin T is cut to a determined width, and the annular belt S is formed (cutting step).

(Main part configuration)
Next, the contact member 60 will be described.

  The contact member 60 has a disk shape (circular cross section) as described above, and is supported by the sizing die 34 via a rod-shaped support member 62 as shown in FIG.

  Further, the outer diameter of the contact member 60 is 100% or more and 102% or less of the outer diameter of the sizing die 34. Thereby, the outer peripheral surface of the contact member 60 and the inner peripheral surface of the cylindrical resin T are in contact over the entire periphery. In other words, there is no gap between the inner peripheral surface of the cylindrical resin T and the outer peripheral surface of the contact member 60.

Moreover, the area of the outer peripheral surface of the contact member 60 which contacts the inner peripheral surface of the cylindrical resin T is 5124 [mm ² ] or less. The coefficient of static friction with respect to C2 paper (hereinafter simply referred to as “C2 paper”) manufactured by Fuji Xerox on the outer peripheral surface of the contact member 60 is 0.5 or less. The static friction coefficient can be measured using a Heidon static friction coefficient measuring machine manufactured by Shinto Kagaku Co., Ltd.

(Effects of main components)
Next, the operation of the main configuration will be described.

  When the cylindrical resin T is cut by the cutter 50A, vibration occurs in the cylindrical resin T. This vibration generated in the cylindrical resin T is transmitted upward and is likely to reach the sizing die 34. For example, when the contact member is not disposed, this vibration is transmitted upward and reaches the sizing die 34.

  However, the contact member 60 is disposed on the downstream side of the sizing mechanism 32 in the conveyance direction of the cylindrical resin T and on the upstream side of the cutting mechanism 50. And the outer peripheral surface of the contact member 60 and the inner peripheral surface of the cylindrical resin T are contacting over the perimeter. For this reason, the vibration generated in the cylindrical resin T is absorbed by the contact member 60 and is suppressed from being transmitted to the sizing die 34.

  For this reason, the waviness of the surface of the annular belt S caused by the vibration generated in the cylindrical resin T being transmitted to the sizing die 34 side is suppressed. Specifically, the vibration generated in the cylindrical resin T is transmitted to the sizing die 34 side, and when the vibration reaches the cylindrical resin T whose shape is not stable, the cylindrical resin T cooled by the sizing mechanism 32 The surface will wave. However, since the vibration generated in the cylindrical resin T is suppressed from being transmitted to the sizing die 34, the undulation generated on the surface of the annular belt S is suppressed.

(Evaluation)
Next, it evaluated using the extrusion molding apparatus which concerns on a present Example, and the extrusion molding apparatus which concerns on a comparative example.

[Evaluation specifications]
As an extrusion molding device, Mitsuba Seisakusho 40V24D-HB was used, the transport speed of the cylindrical resin T was 17 [mm / sec], the width was 250 [mm], the inner diameter was 160 [mm], and the thickness was 0.1 [mm]. An annular belt was formed. The outer diameter of the sizing die was 160 [mm]. Furthermore, the thickness of the contact members of Examples 1 to 5 and Comparative Examples 2 and 3 shown in the table of FIG. 2 was 10 [mm]. In addition, about Examples 1-5 and Comparative Examples 1-3, it is the same specification except the specification of a contact member.

  Polyphenylene sulfide resin (PPS), polyetherimide (PEI), and polyetheretherketone (PEEK) were used for the material of the annular belt.

Next, the contact member of each Example and each Comparative Example will be described using the table shown in FIG.
1. Example 1: The outer diameter of the contact member 60 was set to 100% of the outer diameter of the sizing die 34, and the static friction coefficient of C2 paper on the outer peripheral surface of the contact member 60 was set to 0.3. The area of the outer peripheral surface of the contact member 60 was 5024 [mm ² ].
2. Example 2: The outer diameter of the contact member 60 was set to 102% of the outer diameter of the sizing die 34, and the static friction coefficient of C2 paper on the outer peripheral surface of the contact member 60 was set to 0.3. The area of the outer peripheral surface of the contact member 60 was 5124 [mm ² ].
3. Example 3: The outer diameter of the contact member 60 was set to 102% of the outer diameter of the sizing die 34, and the static friction coefficient of C2 paper on the outer peripheral surface of the contact member 60 was set to 0.5. The area of the outer peripheral surface of the contact member 60 was 5124 [mm ² ].
4). Example 4: The outer diameter of the contact member 60 was 100% of the outer diameter of the sizing die 34, and the static friction coefficient of the C2 paper on the outer peripheral surface of the contact member 60 was 0.25. Thereby, the area of the outer peripheral surface of the contact member 60 became 5024 [mm < ² >]. In addition, the Sepacoat of the material which comprises an outer peripheral surface is a silicone type mold release agent by Shin-Etsu Chemical Co., Ltd.
5). Example 5: The outer diameter of the contact member 60 was 100% of the outer diameter of the sizing die 34, and the static friction coefficient of the C2 paper on the outer peripheral surface of the contact member 60 was 0.6. The area of the outer peripheral surface of the contact member 60 was 5024 [mm ² ].
6). Comparative Example 1: No contact member was used.
7). Comparative Example 2: The outer diameter of the contact member 60 was 99% of the outer diameter of the sizing die 34, and the static friction coefficient of the C2 paper on the outer peripheral surface of the contact member 60 was 0.3. The area of the outer peripheral surface of the contact member 60 was not calculated because it was different from the contact area due to a gap formed between the contact member 60 and the inner peripheral surface of the cylindrical resin T.
8). Comparative Example 3: The outer diameter of the contact member 60 was 103% of the outer diameter of the sizing die 34, and the static friction coefficient of the C2 paper on the outer peripheral surface of the contact member 60 was 0.3. The area of the outer peripheral surface of the contact member 60 was 5175 [mm ² ].

〔Evaluation item〕
The undulation of the surface of the formed annular belt S was visually evaluated.

〔Evaluation criteria〕
“◯” indicates that no undulation has occurred, “Δ” indicates that undulation has occurred but is within the allowable range, and “X” indicates that undulation has occurred and is outside the allowable range. Moreover, when the cylindrical resin T was not conveyed by the frictional force with a contact member, it was set as “XX”.

〔Evaluation results〕
As shown in the table of FIG. 2, Examples 1 to 4 were “◯” and Example 5 was “Δ”. On the other hand, Comparative Examples 1 and 2 were “x”, and Comparative Example 3 was “xx”. The evaluation results were the same regardless of the material of the annular belt.

(Summary)
From the above evaluation results, when the outer diameter of the contact member 60 is 100% or more and 102% or less of the outer diameter of the sizing die 34, the outer diameter of the sizing die 34 is less than 100% or greater than 102%. In comparison, the undulation of the surface of the annular belt S is suppressed. This can be understood by comparing Example 1 and Example 2 with Comparative Example 2 and Comparative Example 3.

  That is, by setting the outer diameter of the contact member 60 to 100% or more of the outer diameter of the sizing die 34, no gap is generated between the inner peripheral surface of the cylindrical resin T and the outer peripheral surface of the contact member 60. . Further, by setting the outer diameter of the contact member 60 to be equal to or less than 102% of the outer diameter of the sizing die 34, it is possible to prevent the cylindrical resin T from being conveyed due to frictional force with the contact member 60. Thereby, the wave of the surface of the annular belt S is suppressed.

Further, the area of the outer peripheral surface of the contact member 60 is 5124 [mm ² ] or less, and the static friction coefficient with respect to the C2 paper on the outer peripheral surface of the contact member 60 is 0.5 or less. Thereby, compared with the case where the area of the outer peripheral surface of the contact member 60 or a static friction coefficient is larger than this value, the surface of the annular belt S is prevented from being corrugated. This can be understood by comparing Example 3 and Comparative Example 3.

That is, when the area of the outer peripheral surface of the contact member 60 is larger than 5124 [mm ² ], an increase in frictional force generated between the outer peripheral surface of the contact member 60 and the inner peripheral surface of the cylindrical resin T is suppressed. Is done. Furthermore, the frictional force generated between the outer peripheral surface of the contact member 60 and the inner peripheral surface of the cylindrical resin T is increased because the static friction coefficient with respect to the C2 paper on the outer peripheral surface of the contact member 60 is greater than 0.5. It is suppressed. Thereby, the wave of the surface of the annular belt S is suppressed.

  In the case of the annular belt S, for example, when the annular belt S is used as an intermediate transfer belt of an electrophotographic image forming apparatus, the surface of the annular belt S is suppressed so that the density of the output image is reduced. The occurrence of unevenness is suppressed.

Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments can be taken within the scope of the present invention. This will be apparent to those skilled in the art. For example, in the above embodiment, the area of the outer peripheral surface of the contact member 60 is 5124 [mm ² ] or less, and the static friction coefficient with respect to the C2 paper on the outer peripheral surface of the contact member 60 is 0.5 or less. However, the outer diameter of the contact member 60 may be 100% or more and 102% or less of the outer diameter of the sizing die 34, and the above-described area and coefficient of static friction need not be in this range.

  In the above-described embodiment, the contact member 60 is disposed between the sizing mechanism 32 and the transport mechanism 42 in the transport direction of the cylindrical resin T. However, the contact member 60 includes the transport mechanism 42, the cutting mechanism 50, and the like. It may be arranged between.

  Further, in the above-described embodiment, although particularly described, when the outer diameter of the contact member 60 is larger than 100% of the outer diameter of the sizing die 34, the contact member 60 is the inner peripheral surface of the cylindrical resin T. The contact member 60 may be elastically deformed so that the outer diameter of the contact member 60 becomes the outer diameter of the sizing die 34 in a state where it is in contact with the sizing die 34. In this case, the cylindrical resin T is conveyed in a stable state.

DESCRIPTION OF SYMBOLS 10 Extrusion molding apparatus 12 Extrusion mechanism 32 Sizing mechanism (an example of a cooling mechanism)
34 Sizing die (an example of a cooling member)
42 Transport mechanism 50 Cutting mechanism 60 Contact member

Claims (4)

An extrusion mechanism for extruding a thermoplastic resin as a cylindrical resin;
A transport mechanism for transporting the cylindrical resin extruded by the extrusion mechanism;
A cooling mechanism having a circular cross-sectional cooling member in contact with the inner peripheral surface of the cylindrical resin being conveyed by the conveying mechanism, and cooling the cylindrical resin;
A cutting mechanism for cutting the cylindrical resin cooled by the cooling mechanism from a direction intersecting the conveyance direction of the cylindrical resin;
It is disc-shaped and is disposed between the cooling mechanism and the cutting mechanism in the transport direction, and has an outer diameter of 100% to 102% with respect to the outer diameter of the cooling member, and is cooled by the cooling mechanism. A contact member that contacts the inner and outer peripheral surfaces of the cylindrical resin;
An extrusion apparatus comprising: The area of the outer peripheral surface of the contact member is 5124 [mm ² ] or less, and the static friction coefficient for C2 paper made by Fuji Xerox on the outer peripheral surface of the contact member is 0.5 or less. The extrusion molding apparatus according to 1. The outer diameter of the contact member is larger than the outer diameter of the cooling member,
3. The extrusion molding apparatus according to claim 1, wherein the contact member is elastically deformed so that an outer diameter of the contact member becomes an outer diameter of the cooling member while being in contact with an inner peripheral surface of the cylindrical resin. .   The cyclic | annular member formed with the extrusion molding apparatus of any one of Claims 1-3.

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