JP4122239B2 - Foreign matter removing method and foreign matter removing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foreign matter removing method and a foreign matter removing device for removing foreign matters such as so-called “meani” adhering to a lip portion surrounding a lip opening of a die.
[0002]
[Prior art]
In a molding apparatus for extruding a melted resin from a lip opening of a die to form a resin film or a resin sheet (hereinafter referred to as a “film” by omitting the resin film and the resin sheet in the present specification) During molding, the resin extruded from the lip mouth and the additives contained therein adhere to the lip around the lip mouth of the die, and as a result, foreign matter such as scouring is generated in the lip. If the foreign matter adhering to the lip portion comes into contact with the resin pushed out from the lip opening or the foreign matter is mixed into the resin, the quality of the film to be molded is deteriorated. For this reason, techniques for removing foreign substances generated in the lip portion have been proposed. As one of them, a pair of sliding bodies provided slidably on the lip of the die, a pair of holding bodies holding the sliding bodies, a guide body for holding the holding bodies movably, and a holding body There is known a foreign matter removing apparatus including a moving means for moving. In this apparatus, the foreign matter attached to the lip portion can be removed by sliding the sliding body along the edge of the lip portion (Patent Document 1).
[0003]
[Patent Document 1]
JP-A-5-92467 [0004]
[Problems to be solved by the invention]
However, in order to remove the foreign matter adhering to the lip portion by the foreign matter removing device described above, it is necessary to stop the molding device. In this foreign matter removing device, when removing the foreign matter, the sliding body is moved across the lip portion and the lip portion so that the resin is pushed out from the lip port while the molding device is in operation. This is because, as a result of excessively adhering to the sliding body, the lip portion is stained. However, once the molding apparatus is stopped, it takes time to stably manufacture a film that can be used as a product. Therefore, when the foreign matter removing apparatus is used, the production efficiency of the product is lowered.
[0005]
Therefore, an object of the present invention is to provide a foreign matter removing method for removing foreign matter adhering to the lip portion of the die while the molding apparatus is in operation, and a foreign matter removing device used in this method.
[0006]
[Means for Solving the Problems]
As a result of research conducted by the inventor to solve the above-described problems, the molding apparatus has a feature that foreign matter easily adheres to a lip portion around one edge of a pair of edges along the lip mouth. I found. And based on this knowledge, the inventor moves the end of the removal tool from the position away from the lip portion to the one edge in the direction intersecting the one edge along the surface including the lip mouth, It has been found that foreign matter adhering to the lip portion can be removed by pressing against the resin extruded from the lip opening.
[0007]
Based on such knowledge, the foreign matter removing method of the present invention is a foreign matter removing method for removing foreign matter adhering to the lip portion around the lip mouth of the die, and the end portion of the removing tool includes the lip mouth. A first step of guiding the end of the removal tool in a direction along one edge of the pair of edges along the lip mouth while maintaining a position away from the lip portion on the surface; and a first step After that, the removal tool is pushed to a position where the position restricting portion provided in the removal tool comes into contact with the holding body that holds the removal tool so as to be movable in a direction crossing one edge on the surface including the lip mouth. A second step of pressing the foreign matter against the resin pushed out from the lip opening by moving the end of the removing tool to the one edge in a direction intersecting the one edge on the surface including the lip opening. Including.
[0008]
In the foreign matter removing method of the present invention, the end portion of the removing tool is guided to the vicinity of the lip portion to which the foreign matter adheres without bringing the end portion of the removing tool into contact with the lip portion (first step). By moving to the edge (second step), the foreign matter is pressed against the resin extruded from the lip port and removed, so that the foreign matter adhering to the lip portion can be removed while the molding apparatus is still in operation. In addition, according to this method, since the foreign matter adhering to the lip portion can be removed without reaching the end portion of the removing tool to the lip mouth, the resin pushed out from the lip mouth is excessive at the end portion of the removing tool. It will not adhere to. Therefore, the lip portion is not soiled by the end portion of the removal tool.
[0009]
The present invention also provides a removal tool having an end for removing foreign matter adhering to the lip portion of the die and a pair of edges attached to the die and extending along the lip mouth of the die, in parallel with one edge. An extending guide body, and a holding body supported and guided by the guide body and holding the removal tool, the lip crossing the one edge and keeping the end of the removal tool parallel to the one edge A holding body that is guided between a position away from the lip portion and one edge in a direction along the surface including the mouth, and the removing tool is guided toward the one edge by the holding body at the end of the removing tool. In this case, it has a position restricting portion that positions the end portion of the removal tool in contact with one edge by contacting the holding body .
[0010]
According to the foreign substance removing apparatus having such a configuration, the end of the removal tool can be guided in the direction along the one edge by moving the holding body along the guide body. Since the part can be guided to the one edge, the removal of the foreign matter performed by the above-described foreign matter removal method can be realized with high accuracy.
[0011]
Moreover, it is preferable that the edge part of said removal tool has the layer containing a fluorine resin formed in the surface. Since foreign matter is difficult to adhere to the removal tool having a layer containing a fluororesin at the end, it is possible to prevent foreign matter adhering to the lip from adhering to the end of the removal tool. It can be reliably pressed against the resin extruded from.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A foreign matter removing method according to a first embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings in order to facilitate understanding of the description.
[0013]
FIG. 1 is a cross-sectional view showing a configuration of a foreign matter removing apparatus 1 used in the foreign matter removing method according to the present embodiment, and shows an example in which the foreign matter removing apparatus 1 is attached to a T die 4 of a molding apparatus 2. In the present specification, “upper and lower” of the words indicating the direction is based on the state shown in FIG. That is, the direction in which the resin is pushed out from the T die 4 is set downward. 2 is a diagram showing the configuration of the foreign matter removing apparatus 1 attached to the T die 4 as viewed from below the T die 4. FIG. 3 shows the entire molding apparatus 2 to which the foreign matter removing apparatus 1 is attached. It is a side view which shows a structure schematically.
[0014]
As shown in FIG. 3, the molding apparatus 2 includes an extruder 6, a feed block 8, a T die 4, a vacuum chamber 10, a chill roll 12, and a plurality of rolls 14, 16, 18, 20, 22, 24. And 26 and a take-up roll 28. In the molding apparatus 2, the resin melted and kneaded by the extruder 6 is extruded from the T die 4 through the feed block 8. The resin extruded from the T die 4 is attracted to the chill roll 12 by the vacuum chamber 10 and is cured by being rapidly cooled by the chill roll 12. The resin cured in the chill roll 12 is wound as a film on the take-up roll 28 via the plurality of rolls 14, 16, 18, 20, 22, 24, and 26.
[0015]
As shown in FIGS. 1 and 2, a lip port 32 is formed at the center of the lower surface (hereinafter referred to as “lip surface” in this specification) 30 of the T die 4. The lip port 32 is a slit-like opening for extruding molten resin to form a film. In the T die 4, the periphery of the lip port 32 in the lip surface 30 is a lip portion 34. The resin 36 extruded from the T die 4 is attracted to the chill roll 12 so that the opposite surface of the lip surface 30 including one edge 38 of the pair of edges along the longitudinal direction of the lip port 32 and the extrusion direction form an acute angle. . In such a T-die 4, the resin pushed out from the lip port 32 makes strong contact with the edge 38 and weakly makes contact with the edge that forms a pair with the edge 38, so that foreign matter such as mess adheres to the lip portion 34 in the vicinity of the edge 38. It is easy to do. The foreign matter removing apparatus 1 is used to remove foreign matter attached to the lip portion 34 in the vicinity of the edge 38.
[0016]
The foreign matter removing apparatus 1 includes a guide body 40, a holding body 42, and a removing tool 44. The guide body 40 is for supporting and guiding the holding body, and includes a spline shaft 46 and a pair of fixing portions 48. The spline shaft 46 extends along an axis parallel to the edge 38. The pair of fixing portions 48 are respectively attached to the side surfaces of the T die 4 and fix the end portion of the spline shaft 46.
[0017]
The holding body 42 includes a supported portion 50 supported by the guide body 40 and a holding portion 52 for holding the removal tool 44. A through hole is formed in the supported portion 50, and a sleeve 54 is fitted into the through hole. When the sleeve 54 is splined with the spline shaft 46, the holding body 42 can move along the spline shaft 46 and cannot be rotated about the shaft. The holding portion 52 is formed with a hole 56 extending in a direction parallel to the lip surface 30 and intersecting the axis of the spline shaft 46.
[0018]
The removal tool 44 has a rod-shaped main body 58. The main body 58 is inserted through the hole 56 of the holding body 42, and the removal tool 44 is movable along the hole 56. A handle 60 is provided at one end of the main body 58. The other end of the main body portion 58 is bent toward the lip surface 30, and a hook-shaped end portion 62 that is in contact with the lip surface 30 is provided in parallel with the edge 38. The end portion 62 is used to remove foreign matter attached to the lip portion 34, and a layer containing a fluorine-based resin is formed on the surface of the end portion 62 in order to make it difficult to adhere the foreign matter. This layer may be a fluororesin coating film, but is preferably a composite plating in which fluororesin fine particles are dispersed in a nickel plating film in order to improve the durability against friction.
[0019]
Further, a position restricting portion 64 extends from the main body portion 58 of the removing tool 44. The position restricting portion 64 has a surface 66 that is parallel to the edge 38 and orthogonal to the lip surface 30. When the removal tool 44 is moved along the hole 56, the position restricting portion 64 is configured so that the surface 66 and the surface 68 of the supported portion 50 facing the surface 66 come into contact with each other so that the end portion 62 of the removal tool is the edge 38. It has the function to position so that it may touch.
[0020]
A screw 70 is attached to the position restricting portion 64, and the screw 70 is fixed by a nut 72. In the state shown in FIG. 1 and FIG. 2, when the surface 66 of the position restricting portion 64 and the surface 68 of the supported portion 50 are brought into contact with each other, the surface of the holding portion 52 where the tip portion of the screw 70 faces this The position is adjusted so as to come into contact with 74. When the film is formed, the screw 70 is further protruded from the position restricting portion 64, so that the operation of moving the end 62 of the removing tool to the edge 38 is mistakenly performed and the surface 66 of the position restricting portion 64 and the supported surface. The front end of the screw 70 can be brought into contact with the surface 74 of the holding part 52 before it comes into contact with the surface 68 of the part 50, thereby preventing the end 62 of the removal tool from reaching the edge 38. it can.
[0021]
A coil spring 76 is disposed between the surface 66 of the position restricting portion 64 and the surface 74 of the holding portion 52. A main body 58 is inserted through the coil spring 76. The coil spring 76 urges the position restricting portion 64 so that the end portion 62 of the removing tool is separated from the edge 38 along the lip surface 30.
[0022]
Next, the foreign substance removal method implemented using this foreign substance removal apparatus 1 is demonstrated. In the normal operating state of the molding apparatus 2, the end 62 of the removal tool is located at a position away from the lip 34 as shown in FIG. The foreign matter removing apparatus 1 is used as described below at a predetermined timing such as when a foreign matter is found in the lip portion 34 while the film is generated by the forming device 2 or when the take-up roll 28 is replaced.
[0023]
First, the position restricting portion 64 is urged by a spring, and the holding body 42 is moved along the spline shaft 46 while maintaining the state where the end portion 62 of the removing tool is separated from the lip portion 34 on the lip surface 30 ( First step). By moving the end portion 62 of the removing tool in this way, the end portion 62 of the removing tool is a portion of the lip portion 34 near the edge 38 of the lip portion 34 to which the foreign matter d adheres as shown in FIG. Guided to the vicinity. In this first step, the end 62 of the removal tool is guided without contacting the resin extruded from the lip port 32.
[0024]
Next, by pushing the handle 60 to a position where the surface 66 of the position restricting portion 64 comes into contact with the surface 68 of the holding portion 52, the end portion 62 of the removing tool is moved as shown in the cross-sectional view of the foreign matter removing apparatus 1 in FIG. Move to edge 38 (second step). Thus, by moving the end portion 62 of the removing tool along the lip surface 30 to the edge 38, the foreign matter attached to the lip portion 34 in the vicinity of the edge 38 is pressed against the resin pushed out from the lip port 32, and the resin Is removed.
[0025]
After the removal of the foreign matter is completed, the film supplied to the take-up roll 28 is cut off, and the end portion of the film taken up by the take-up roll 28 is cut off, thereby forming a portion made of resin pressed against the foreign matter Discard the film.
[0026]
According to the above foreign matter removing method, the foreign matter adhering to the lip portion 34 is pressed against the resin extruded from the lip port 32 to remove the foreign matter, so that the foreign matter can be removed while the molding apparatus 2 is in operation. Further, according to this foreign matter removing method, foreign matter adhering to the lip portion 34 can be removed without reaching the end portion 62 of the removing tool to the lip port 32, so that the resin pushed out from the lip port 32 is removed. There is no excessive adhesion to the end 62 of the tool. Therefore, the lip 34 is not soiled by the end 62 of the removing tool.
[0027]
Further, by moving the holding body 42 along the spline shaft 46 of the guide body 40, the end 62 of the removal tool can be accurately moved in the direction along the edge 38, and along the hole 56 of the holding body 42. By moving the guide body, the end 62 of the removal tool can be accurately guided to the edge 38. Therefore, according to the foreign matter removing apparatus 1, the foreign matter removal performed by the foreign matter removing method of the present invention can be performed. Realized with high accuracy. Furthermore, by operating the handle 60 that is spaced from the T die 4, the end 62 of the removal tool can be moved to the edge 38, thereby preventing the risk of touching the hot T die 4 with a hand. it can.
[0028]
In the second embodiment, as an example in which the foreign matter removing method of the present invention performed using the foreign matter removing apparatus 1 is effectively applied, a film in which foreign matter is likely to adhere only to the edge 38 will be described.
[0029]
As an example of such a film, a resin having a high frequency of occurrence of the resin is extruded from the lip port 32 as a resin that contacts the edge 38, and a resin having a low frequency of the occurrence of a resin is formed as a resin that contacts the edge that is paired with the edge 38. A multilayer film formed by extrusion from the mouth 32 is exemplified. Examples of the resin extruded from the lip port 32 in contact with the edge 38 include 0.01 to 80 parts by weight of fine particles having a weight average particle diameter of 1 to 20 μm with respect to 100 parts by weight of the polyolefin resin. A thermoplastic resin composition is illustrated. Examples of the fine particles include organic fine particles such as crosslinked polymethyl methacrylate, crosslinked polystyrene, and crosslinked silicone, and inorganic fine particles such as synthetic aluminosilicate powder, silica powder, diatomaceous earth, and titanium oxide.
[0030]
In addition to this, as the resin that contacts the edge 38, a propylene-ethylene block copolymer comprising a polymer portion mainly composed of propylene and a propylene-ethylene copolymer portion, or a composition thereof, or the above polyolefin resin A polyolefin resin composition containing 0.5 to ³⁰ heavy polyethylene parts having a density of 870 to 970 kg / m ³ different from that of the polyolefin resin is exemplified with respect to 100 heavy parts. Here, as the polyolefin resin, polypropylene such as propylene homopolymer, propylene-ethylene copolymer, propylene-ethylene-butene-1 copolymer, propylene-butene-1 copolymer, propylene-ethylene block copolymer, etc. An ethylene-α-olefin copolymer having a density of 870 to 920 kg / m ³ can be used as the polyethylene resin.
[0031]
On the other hand, as the resin that contacts the edge that forms a pair with the edge 38 with the lip port 32 in between, polyolefin resin such as polyethylene resin or polypropylene resin, polyester resin such as polystyrene, polyethylene terephthalate or polybutylene terephthalate, polyamide Thermoplastic resins such as polycarbonate resins and polycarbonate can be used. Among these, from the viewpoint of film processability, a thermoplastic resin having a Vicat softening temperature of 70 to 180 ° C. is particularly preferable, and from the viewpoint of manufacturing cost, it is preferable to use a resin containing a polyolefin resin.
[0032]
The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the above embodiment. For example, by moving the end 62 of the removing tool to the edge 38 and then moving the end 62 of the removing tool along the edge 38, the foreign substance is pressed against the resin pushed out from the lip port 32 and removed. Can do.
[0033]
Moreover, although the said embodiment showed the example which applied the foreign material removal method of this invention and the foreign material removal apparatus used for this foreign material removal method to the T-die film forming machine which has T-die 4, thought of this invention Is a foreign matter removing method for removing foreign matter adhering to the lip portion of an inflation film forming machine, a T-die sheet forming machine, an extruded foamed sheet forming machine, an extruded laminated film forming machine, etc. and a foreign matter removing apparatus used for this foreign matter removing method Applicable.
[0034]
【The invention's effect】
As described above, according to the foreign matter removing method of the present invention, the foreign matter attached to the lip portion of the die can be removed while the molding apparatus is operating. Therefore, according to this foreign matter removing method, foreign matter can be removed from the lip portion without lowering the film forming efficiency, and a film with good quality can be formed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration of a foreign matter removing apparatus according to an embodiment.
FIG. 2 is a diagram showing the configuration of the foreign matter removing apparatus of FIG. 1 as viewed from below.
FIG. 3 is a side view schematically showing the overall configuration of the molding apparatus.
FIG. 4 is a diagram showing the configuration of the foreign matter removing apparatus according to the embodiment as viewed from below, and shows a state in which the end portion of the removal tool is guided to the vicinity of the edge of the lip portion to which the foreign matter has adhered. FIG.
FIG. 5 is a cross-sectional view showing the configuration of the foreign matter removing apparatus according to the embodiment, and is a view showing a state in which the end of the removing tool is moved to the edge of the lip portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Foreign material removal apparatus, 2 ... Molding apparatus, 4 ... T die, 12 ... Chill roll, 28 ... Winding roll, 30 ... Lip surface, 32 ... Lip mouth, 34 ... Lip part, 38 ... Edge, 40 ... Guide body, 42 ... Holding body, 44 ... Removal tool, 46 ... Spline shaft, 48 ... Fixed portion, 50 ... Supported portion, 52 ... Holding portion, 54 ... Sleeve, 58 ... Main body portion, 60 ... Handle, 62 ... End portion, 64 ... position restriction part, 76 ... coil spring.

Claims (4)

A foreign matter removing method for removing foreign matter adhering to a lip portion around a lip mouth of a die,
The end of the removal tool is guided in the direction along one edge of the pair of edges along the lip mouth while maintaining the end of the removal tool at a position away from the lip portion on the surface including the lip mouth. A first step of:
After the first step, a position restricting portion provided in the removal tool is applied to a holding body that holds the removal tool so as to be movable in a direction intersecting the one edge on the surface including the lip mouth. By pushing the removing tool to a position where it comes into contact, the end of the removing tool is moved to the one edge in a direction intersecting the one edge on the surface including the lip mouth, and the resin is pushed out from the lip mouth. A second step of pressing the foreign matter;
A foreign matter removing method comprising:   2. The foreign matter removing method according to claim 1, wherein the removing tool is a removing tool in which a layer containing a fluorine-based resin is formed on the end portion. A removal tool having an end for removing foreign matter adhering to the lip portion of the die;
A guide body attached to the die and extending parallel to one edge of the pair of edges extending along the lip opening of the die;
A holding body that is supported and guided by the guide body and that holds the removal tool, the edge of the removal tool being parallel to the one edge and crossing the one edge, and the lip opening and a holding member for guiding between said one edge and a position away from said lip portion in a direction along a plane including,
The removing tool comes into contact with the one edge by contacting the holding body when the end of the removing tool is guided toward the one edge by the holding body. A foreign matter removing apparatus having a position restricting portion for positioning on a surface.   The foreign matter removing apparatus according to claim 3, wherein a layer containing a fluorine-based resin is formed on a surface of the end portion of the removing tool.

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