JP2014137123A - Method for lubricating bearing part and resin film manufacturing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for lubricating a bearing part which does not cause the scatter of lubrication oil to a resin film by excessive supply and the wear of a rail by short supply by using lubrication oil which is excellent in thermal stability without causing hydrolysis and high in affinity with the resin film.SOLUTION: A device (hereinafter called as a tenter device) comprises: two clip chain groups composed of a plurality of clip chains, the clip chain being a component including a resin film gripping part for gripping the end of a resin film, a drive chain part driven by a sprocket, and a bearing part which changes the position of the resin film gripping part along a rail; and lubrication oil supply means for supplying lubrication oil to a plurality of the bearing parts in the clip chain groups. In a method for lubricating the bearing parts in the tenter device, the lubrication oil supplied from the lubrication oil supply means is a polyalkyl ether compound.

Description

  The present invention relates to a lubrication method for a bearing portion in a clip chain group that holds both ends of a resin film in a tenter device for transversely stretching the resin film.

  As a method for producing a resin film such as a biaxially stretched polyester film, an unstretched resin film that has been discharged from a die into a sheet and cooled and solidified on a cast drum is stretched in the direction of transporting the resin film with a longitudinal stretching machine, Known are the sequential biaxial stretching method in which the tenter device stretches in the width direction of the resin film, and the simultaneous biaxial stretching method in which the unstretched resin film is stretched in the tenter device in the resin film transport direction and the resin film width direction. It has been.

  In the tenter device used in these manufacturing methods, a plurality of air ejection nozzles provided with air ejection holes on the surface facing the resin film surface are arranged in the resin film transport direction. The air controlled to a desired temperature by the heat exchanger is sent to each air ejection nozzle by a fan, and blown toward the resin film surface from the ejection holes. The blown air is collected from the suction port in the tenter device and reused.

  In general, the tenter device is divided into a plurality of zones such as a preheating zone, a stretching zone, a heat setting zone, and a cooling zone in the direction of transporting the resin film, and is configured so that the temperature of air can be set at least for each zone. The resin film gripped at both ends by the clip chain group is heated to a temperature suitable for stretching in the preheating zone, stretched at least in the width direction in the stretching zone, and then subjected to heat treatment in the heat setting zone or cooling zone. It is cooled. The air ejection nozzle promotes heat exchange between the air and the resin film by blowing air controlled to a desired temperature onto the surface of the resin film, and heats or cools the resin film.

  The characteristics of the resin film produced in this way are formed by the thermal history received when passing through each zone of the tenter device. Because the clip chain group that holds both ends of the resin film receives a thermal history in the same way as the resin film, it does not cause the lubricant to splash on the resin film due to excessive supply of lubricant, or the rails to wear due to lack of lubricant. It has been difficult to maintain an appropriate oil film, and various improvements have been made so far.

  Patent Document 1 discloses a structure in which an oil groove is provided on a bearing (support roller) running surface of a rail (steel belt) and a lubricating oil supply port is provided in the oil groove.

  Patent Document 2 discloses a polyether-based synthetic oil containing a fluorine compound as a lubricating oil.

JP-A-10-235729 JP 2009-185100 A

  The invention described in Patent Document 1 has a problem that an oil film is not formed on the bearing surface unless lubricating oil accumulates to some extent in the oil groove. In addition, there is a problem that the lubricating oil accumulated in the oil groove is denatured and solidified to clog the supply port. Furthermore, there is a problem that it is very difficult to remove the lubricating oil solidified in the oil groove.

  Regarding the invention described in Patent Document 2, the fluorine-based lubricating oil hardly forms an oil film due to its own peelability, and the fluorine-based lubricating oil also has poor affinity with the resin film. Furthermore, the tenter device is only mentioned as one of many possible uses, and the optimum application method for the tenter device has not been studied.

For this reason, the present invention uses a lubricant that does not cause hydrolysis, has excellent thermal stability, and has a high affinity for resin fill, so that the lubricant is scattered on the resin film due to excessive supply and the rail wear due to insufficient supply. It is an object of the present invention to provide a method for lubricating a bearing portion that does not cause a problem.

The present invention for solving the above problems is as follows.
(1) A clip chain is a member having a resin film gripping portion that grips an end portion of the resin film, a drive chain portion driven by a sprocket, and a bearing portion that changes the position of the resin film gripping portion along the rail. When
In an apparatus (hereinafter referred to as a tenter apparatus) having two clip chain groups each including a plurality of clip chains and further having a lubricant supply means for supplying lubricant to a plurality of bearing portions in the clip chain group, A method of lubricating a bearing portion in a tenter device,
A method for lubricating a bearing portion, wherein the lubricating oil supplied from the lubricating oil supply means is a polyalkyl ether compound.
(2)
(1) The total amount per unit time of the lubricating oil supplied to the bearing portion in one clip chain group is 0.05 ml / hour or more and 0.4 ml / hour or less. A method of lubricating the bearing.
(3)
The method for lubricating a bearing part according to (1) or (2), wherein the lubricating oil has a kinematic viscosity at 40 ° C. of 500 mm ² / s or more and 1,000 mm ² / s or less.
(4)
The method for lubricating a bearing part according to any one of (1) to (3), wherein supply amounts can be individually adjusted for a plurality of bearings in the bearing part.
(5)
The lubricating oil supplied from the lubricating oil supply means is supplied by adjusting a supply amount in accordance with a traveling speed of the clip chain group, according to any one of (1) to (4), A method of lubricating the bearing.
(6)
The method for lubricating a bearing portion according to any one of (1) to (5), wherein the lubricating oil supply means is a gear pump.
(7)
The lubricating oil supplied from the lubricating oil supply means is supplied in the form of a mist by a gas-liquid mixing means provided in the middle of the supply pipe. (1) to (6) A method of lubricating the described bearing part.
(8)
(1) The manufacturing method of the resin film characterized by using the method of lubricating the bearing part in any one of (7).

Resin film without adhesion of lubricant due to excessive supply of lubricant or adhesion of rail wear powder caused by lack of lubricant can be supplied stably.

Schematic illustration of the tenter device Schematic illustration of clip chain Outline explanatory diagram of resin film manufacturing process

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking as an example a case where the present invention is applied to a manufacturing process of a biaxially stretched resin film.

  FIG. 3 is a schematic view showing an embodiment of the manufacturing process of the resin film 12 by the sequential biaxial stretching method.

As shown in FIG. 3, the manufacturing process of the resin film 12 by the sequential biaxial stretching method includes an extruder 21, a base 22, a cast drum 23, a longitudinal stretching machine 24, a tenter device 10, and a winder 25. The unstretched resin film 12 obtained by melting and extruding at 21, discharged in a sheet form from the slit gap of the die 22, and cooled and solidified by the cast drum 23 is stretched in the conveying direction by a longitudinal stretching machine 24 and uniaxially stretched. The uniaxially stretched resin film 12 is stretched in the width direction of the resin film 12 by the tenter device 10 to form a biaxially stretched resin film 12, and the biaxially stretched resin film 12 is continuously formed by a winder 25. It is intended to wind up. During the above process, when applying the coating liquid to the surface of the resin film 12, an application device (not shown) may be installed immediately before the tenter device 10. Here, an example in the sequential biaxial stretching method is shown, but in the simultaneous biaxial stretching method, an unstretched resin film 12 obtained by cooling and solidifying with the cast drum 23 without using the longitudinal stretching machine 24 is used as a tenter device. 10 may be a biaxially stretched resin film 12 that is simultaneously stretched in the transport direction of the resin film 12 and the width direction of the resin film 12. In addition, the conveyance direction said by this invention shows the direction which goes to the winder 25 from the extruder 21 in the manufacturing process of FIG.

FIG. 1 is a plan view (top view) showing one embodiment of the tenter device 10. Here, the tenter device 10 is generally divided into a preheating zone 26, a stretching zone 27, a heat fixing zone 28, and a cooling zone 29 from the upstream side to the downstream side in the conveying direction of the resin film 12, and at least each The air temperature can be set for each zone.

  The clip chain 1 has a resin film gripping part that grips an end of the resin film 12, a drive chain part driven by the downstream sprocket 16, and a bearing part that changes the position of the resin film gripping part along the rail. It is a member.

  The tenter device 10 includes two clip chain groups 11 including a plurality of clip chains 1, and further includes a lubricating oil supply means 7 that supplies lubricating oil to a plurality of bearing portions in the clip chain group 11. means.

  Here, the resin film gripping portion that grips the end portion of the resin film 12 has a function of gripping the end portion of the resin film in the tenter device.

  The drive chain portion driven by the downstream sprocket 16 is connected in an annular shape between the upstream sprocket 15 having a tension adjusting function and the downstream sprocket 16 having a rotational driving function. The drive chain portion has a function of stretching while transporting the resin film 12 by the rotation of the downstream sprocket 16.

  The bearing portion that changes the position of the resin film gripping portion along the rail has a function for smoothly running along the rail 5 that regulates the position in the width direction of the resin film in the tenter device 10. The bearing portion has at least two bearings. And when a bearing part has two bearings, it has the inner bearing 13 and the outer bearing 14 so that the rail 5 may be inserted | pinched.

  The clip chain group 11 composed of a plurality of clip chains 1 is a member in which a plurality of clip chains 1 are arranged in a drive chain portion that is connected in an annular shape between an upstream sprocket 15 and a downstream sprocket 16. .

  Lubricating oil supply means 7 for supplying lubricating oil to the plurality of bearing parts 4 in the clip chain group 11 supplies a tank for storing lubricating oil, a pump for supplying the lubricating oil, and lubricating oil to the rail 5. It has a function of lubricating the rail 5 and the bearing portion 4 by forming an appropriate oil film on the rail 5 and the bearing portion 4.

  The tenter device 10 has two clip chain groups. About this, since the clip chain group 11 has the function to convey the resin film 12 in the tenter device 10 by gripping both ends of the resin film 10 using the resin film gripping portion 2, the tenter device 10 is a clip. It is important to have two chain groups 11.

  That is, as shown in the figure, the tenter device 10 has two clip chain groups 11 each having a plurality of clip chains 1 each having a resin film gripping part that grips an end of the resin film 10, and the two clip chain groups 11. By disposing them in opposition, the resin film 12 can be stretched in the width direction by changing the position in the width direction of the two clip chain groups 11 that hold both ends of the resin film 10 while being conveyed. . Furthermore, as described above, the tenter device 10 includes the lubricating oil supply means 7 that supplies the lubricating oil to the bearing portion.

  The resin film gripping portion in the clip chain 1 has a function of gripping both ends of the resin film 12 on the upstream side of the tenter device 10, passing through the tenter device 10, and releasing the resin film 12 on the downstream side of the tenter device 10. Have.

  The tenter device 10 is generally divided into a preheating zone 26, a stretching zone 27, a heat setting zone 28, and a cooling zone 29 from the upstream side to the downstream side in the conveying direction of the resin film 12, and at least for each zone. The temperature of the air can be set. Each of these zones may be divided into a plurality of chambers in the transport direction of the resin film 12 and may be configured such that the temperature of the air can be set for each chamber. That is, the tenter device 10 may have, for example, three chambers as the preheating zone 26, four chambers as the stretching zone 27, two chambers as the heat fixing zone 28, one chamber as the cooling zone 29, and the like. It is also possible to set the temperature of each chamber in each zone independently.

  In addition, for example, when the resin film 12 is a polyester film, the temperature range of each zone is 80 to 140 ° C. in the preheating zone 26, 80 to 200 ° C. in the stretching zone 27, and 150 to 150 in the heat setting zone 28. It can be set to 50 to 200 ° C. in the cooling zone 29 at 240 ° C.

  The resin film 12 can be stretched in the width direction by arranging the positions in the width direction of the two clip chain groups 11 so that the relative distance gradually increases in the stretching zone 27. If necessary, the resin film 12 can be relaxed in the width direction by providing a section in which the relative distance gradually decreases in the heat fixing zone or the cooling zone.

  In the manufacturing process of the resin film 12 by the simultaneous biaxial stretching method, the resin film 12 is transported in the transport direction by gradually widening the distance between the adjacent clip chain 1 and the clip chain 1 in the stretching zone 27 of the tenter device 10. Can also be stretched.

The tenter device used in the present invention has a lubricating oil supply means 7 and supplies lubricating oil to the plurality of bearing portions 4 in the clip chain group 11. The lubricating oil supply means 7 is desirably disposed on the downstream side of the tenter device 10 and at a position where the lubricating oil is supplied after the resin film gripping part 2 releases the resin film 12. The clip chain 1 after releasing the resin film 12 may be of an internal return type that passes through the inside of the tenter device 10 (not shown) and returns to the upstream side of the tenter device 10. However, when the temperature of the clip chain 1 rises, Since the clip chain 1 adheres and becomes dirty, it is desirable to lower the temperature of the clip chain 1 by an external return system that returns to the upstream side of the tenter device 10 through the outside of the tenter device 10 as shown.

FIG. 2 schematically shows the clip chain 1 taken along the line AA in FIG. The clip chain 1 includes a resin film gripping portion 2 that grips an end portion of the resin film 12, a bearing portion 4 for smoothly running along a rail 5 that regulates a position in the width direction, and a drive chain 3. doing.

The number of bearings that the bearing unit 4 has is not particularly limited, but the bearing unit 4 in the mode of FIG. 2 has two bearings of an inner bearing 13 and an outer bearing 14 so as to sandwich the rail 5, and the rail 5 has two In the portion where the relative distance in the width direction of the clip chain group 11 gradually increases and the resin film 12 is stretched in the width direction, a large force is applied to the outer bearing 14 by the stretching tension of the resin film 12. In the vicinity of the upstream of the tenter device 10, a large force is applied to the inner bearing due to the tension of the drive chain. When a large force is applied to one of the inner bearing 13 and the outer bearing 14, a gap is opened on the opposite side. As described above, since a large force is repeatedly applied between the rail 5, the inner bearing 13, and the outer bearing 14, and a gap is repeatedly opened, lubricating oil is supplied to the bearing portion in the tenter device, so that the bearing portion It is important to lubricate.

The supply of the lubricating oil by the lubricating oil supply means 7 to the inner bearing 13 and the outer bearing 14, which are the bearing portions 4, can be branched from one lubricating oil supply means 7. In this case, it is preferable that the lubricant is supplied by a predetermined amount from the outer lubricant supply means 8 and the lubricant is supplied to the inner bearing 13 by a predetermined amount from the inner lubricant supply means 9. That is, in the present invention, it is preferable that the supply amount can be individually adjusted for a plurality of bearings in the bearing portion.

When the traveling speed of the resin film 12 in the tenter device 10 changes from 100 m / min to 200 m / min depending on the thickness of the resin film 12, for example, a constant lubricating oil supply amount from 100 m / min to 200 m / min may be used. When the running speed is slower than 150 m / min on the basis of the intermediate speed of 150 m / min, the amount of lubricating oil supplied is reduced, and when the running speed is faster than 150 m / min, the amount of lubricating oil supplied Is preferably increased. That is, it is desirable that the method of the present invention is supplied by adjusting the supply amount of the lubricating oil in accordance with the traveling speed of the clip chain group 11.

In the present invention, the lubricating oil supplied from the lubricating oil supply means has high heat resistance including heat cycle and high lubricity (oil film formation retention) against loads including repetition, and therefore the lubricating oil is a polyalkyl ether. It is important to be a system compound. As such polyalkyl ether compounds, those obtained by addition polymerization of alkyleneoxy such as ethylene oxide and polypropylene oxide, and alkyl diphenyl ethers are desirable. A polyalkyl ether compound particularly preferable as the lubricating oil is polyoxypropylene glycol monoalkyl ether or polyoxyethylene propylene glycol monoalkyl ether.

In the present invention, it is preferable that the total amount per unit time of the lubricating oil supplied to the bearing portion in one clip chain group is 0.05 ml / hour or more and 0.4 ml / hour or less. That is, when the lubricating oil is supplied from one lubricating oil supply means 7 to the bearing portion 4 (in FIG. 2, the inner bearing 13 and the outer bearing 14) in one clip chain group 11, The amount of lubricating oil supplied is preferably 0.05 ml / hour or more. Further, with respect to the bearing portion 4 (inner bearing 13 and outer bearing 14 in FIG. 2) in one clip chain group 11, a plurality of lubricating oil supply means (outer lubricating oil supply means 8 in FIG. 2) When the lubricating oil is supplied by the inner lubricating oil supply means), the total amount of the lubricating oil supplied from the plurality of lubricating oil supply means is preferably 0.05 ml / hour or more. If the total amount of lubricating oil supplied to the bearing portion in one clip chain group per unit time is less than 0.05 ml / hour, no oil film is formed on the outer peripheral surfaces of the inner bearing 13 and the outer bearing 14. When the portion is generated, the rail 5 may be worn.

Further, the total amount of lubricating oil supplied from the lubricating oil supply means 7 to the bearing portion 4 in one clip chain group 11 is preferably 0.4 ml / hour or less. If it is more than this, even if an oil film is formed on the outer peripheral surfaces of the inner bearing 13 and the outer bearing 14, the surplus lubricating oil may scatter due to centrifugal force and adhere to the film 12.

The lubricant preferably has a kinematic viscosity at 40 ° C. of 500 mm ² / s or more and 1,000 mm ² / s or less.

When the kinematic viscosity of the lubricating oil is less than 500 mm ² / s, even if an oil film is once formed on the outer peripheral surfaces of the inner bearing 13 and the outer bearing 14, the film may be cut immediately. If the kinematic viscosity of the lubricating oil exceeds 1,000 mm ² / s, the rotational resistance between the inner bearing 13 and the outer bearing 14 increases, and the driving resistance of the clip chain group 11 may increase more than necessary.

In order to make the kinematic viscosity at 40 ° C. of the lubricating oil 500 mm ² / s or more and 1,000 mm ² / s or less, a method of adding a thickener in the lubricating oil, or a polyalkyl ether compound that is a lubricating oil Although it is possible to increase the kinematic viscosity by increasing the degree of polymerization and increasing the molecular weight, the latter method is more desirable.

  The lubricating oil supply means is preferably a gear pump. That is, it is desirable that the pump for feeding the lubricating oil of the lubricating oil supply means 7 is a gear pump. The gear pump is always excellent in the performance of feeding a constant amount, and can feed lubricating oil of any viscosity.

  The lubricating oil supplied from the lubricating oil supply means 7 is mixed with gas by a gas-liquid mixing means provided in the middle of a supply pipe for supplying the lubricating oil to the rail 5, so that the mist is formed into a bearing portion ( It is desirable to supply the surfaces of the inner bearing 13 and the outer bearing 14). Thereby, compared with the case where the lubricating oil is supplied as a liquid, it is possible to prevent the supply amount from being uneven due to the surface tension of the lubricating oil, and to supply the lubricating oil uniformly.

The method for producing a resin film of the present invention is characterized by using the method for lubricating a bearing portion of the present invention described so far. According to the method for producing a resin film of the present invention, it is possible to stably supply a resin film without adhesion of lubricating oil or adhesion of rail wear powder. In addition, as long as the manufacturing method of this invention has the process of manufacturing a resin film using a tenter apparatus, there is no restriction | limiting in the application range, It can apply to various resin films. In particular, when the resin film is an aromatic polyester film, the production method of the present invention is suitable.

  Examples of the present invention will be described below.

Example 1
A PET film was produced in the resin film production process shown in FIGS. Here, PET is an abbreviation for polyethylene terephthalate.

The running speed of the resin film 12 is 100 m / min, the film thickness is 100 μm, the kinematic viscosity at 40 ° C. is 616 mm ² / s (chemical name: polyoxypropylene glycol monoalkyl ether (PGMA) / manufacturer : UCC / Part No .: LB-3000) as a lubricating oil, 0.35 ml / hour is supplied. As a result, there is no excessive supply of lubricating oil and no scattering of lubricating oil due to a decrease in viscosity, and rail 5 is worn due to insufficient supply of lubricating oil. As a result, no iron powder was generated and a good film could be produced.

  The kinematic viscosity was measured by the method described in JISZ8803: 2011.

Example 2
A PET film was produced in the resin film production process shown in FIGS.

The running speed of the resin film 12 is 200 m / min, and when the film thickness is 50 μm, the polyalkyl ether compound (chemical name: polyoxyethylene propylene glycol monoalkyl ether (EPGMA) having a kinematic viscosity at 40 ° C. of 945 mm ² / s. ) / Manufacturer: UCC / Part No .: 50HB-5100) as a lubricant, 0.1 ml / hour is supplied. As a result, there is no excessive supply of lubricant and no scattering of lubricant due to a decrease in viscosity. A good film could be produced without generation of iron powder generated by abrasion.

  However, since the kinematic viscosity of the lubricating oil was high, the driving resistance of the tenter device was large and it was considered that a lubricating oil with a higher viscosity could not be used.

Comparative Example 1
A PET film was produced in the resin film production process shown in FIGS.

When the running speed of the resin film 12 is 70 m / min and the thickness of the film is 190 μm, an ester compound (manufacturer: NOK Crubber / Part No .: Primium Super M93) having a kinematic viscosity at 40 ° C. of 300 mm ² / s is used as a lubricating oil. As a result, the supply amount of the lubricating oil was adjusted so that the lubricating oil was not scattered because the viscosity of the lubricating oil was low (0.3 ml / hour), but the rail 5 was worn due to insufficient supply of the lubricating oil, Iron powder adhered to the PET film, and a good film was not obtained.

  Even if the running speed is low, if the supply amount of the lubricating oil is increased, the lubricating oil is scattered, so that the supply amount of the lubricating oil cannot be increased.

Comparative Example 2
A PET film was produced in the resin film production process shown in FIGS.

Resin film 12 has a running speed of 150 m / min, and when the film thickness is 80 μm, an ester compound having a kinematic viscosity at 40 ° C. of 330 mm ² / s (manufacturer: Sato Special Oil / Part No .: High Thermol No. 700) As a result, the film was adjusted so that iron powder did not adhere to the film (0.5 ml / hour), but the lubricating oil was scattered and a good film could not be obtained. At this time, the synthetic lubricating oil adhering to the PET film was altered, and the ester was hydrolyzed by moisture and heat.

Comparative Example 3
A PET film was produced in the resin film production process shown in FIGS.

The running speed of the resin film 12 is 100 m / min. When the film thickness is 100 μm, a fluorine-containing polyether compound (manufacturer: NOK Crubber / Part No .: Varielta J800 Fluid) having a kinematic viscosity at 40 ° C. of 800 mm ² / s is used. As a result of supplying 0.5 ml / hour of lubricating oil, the lubricating oil scatters due to excessive supply of the lubricating oil in spite of the lubricating oil having the most excellent heat resistance stability, and the rail 5 is caused by insufficient supply of lubricating oil. Iron powder was also generated due to wear. This is because an appropriate oil film was not uniformly formed on the surface of the rail 5 due to the peelability of fluorine itself. Furthermore, the lubricating oil adhering to the PET film was transferred to another part by the winder 25, and the adhering range of the lubricating oil was greatly increased, and normal production was not possible.

Comparative Example 4
A PET film was produced in the resin film production process shown in FIGS.

When the running speed of the resin film 12 is 200 m / min and the film thickness is 50 μm, 0.7 ml of mineral oil-based lubricating oil (manufacturer: Idemitsu Kosan / Part No .: High Temp C) having a kinematic viscosity at 40 ° C. of 780 mm ² / s. / Time supply result,
Metal components such as molybdenum added to improve the lubricity of the lubricating oil become solid residue and adhere to the running part, the movement of the inner bearing 13 and the outer bearing 14 becomes worse, the rail 5 is scraped and iron powder is applied to the PET film. Attached. As a countermeasure, when the supply amount of lubricating oil was increased, iron powder adhered more.

Comparative Example 5
A PET film was produced in the resin film production process shown in FIGS.

The running speed of the resin film 12 is 100 m / min, and when the film thickness is 100 μm, the mineral oil-based lubricating oil having a kinematic viscosity at 40 ° C. of 220 mm ² / s (manufacturer: JX Nippon Oil & Energy / Part No .: FBK Oil RO220) As a result of supplying 1 ml / hour of oil, scattering of lubricating oil occurs due to excessive supply of lubricating oil, and iron powder generated due to wear of rail 5 due to insufficient supply of lubricating oil also occurs, producing a good PET film could not.

1: Clip chain 2: Resin film gripping part 3: Drive chain 4: Bearing part 5: Rail 6: Rail support 7: Lubricating oil supply means 8: Outer lubricating oil supply means 9: Inner lubricating oil supply means 10: Tenter device 11 : Clip chain group 12: Resin film 13: Inner bearing 14: Outer bearing 15: Upstream sprocket 16: Downstream sprocket 21: Extruder 22: Die 23: Cast drum 24: Longitudinal stretcher 25: Winder 26: Preheating zone 27 : Stretching zone 28: Heat setting zone 29: Cooling zone

Claims (8)

When a clip film is used as a member having a resin film gripping part that grips an end of the resin film, a drive chain part driven by a sprocket, and a bearing part that changes the position of the resin film gripping part along the rail,
In an apparatus (hereinafter referred to as a tenter apparatus) having two clip chain groups each including a plurality of clip chains and further having a lubricant supply means for supplying lubricant to a plurality of bearing portions in the clip chain group, A method of lubricating a bearing portion in a tenter device,
A method for lubricating a bearing portion, wherein the lubricating oil supplied from the lubricating oil supply means is a polyalkyl ether compound.   The total amount per unit time of lubricating oil supplied to the bearing portion in one clip chain group is 0.05 ml / hour or more and 0.4 ml / hour or less. A method of lubricating the bearing. 3. The method for lubricating a bearing portion according to claim 1, wherein the lubricating oil has a kinematic viscosity at 40 ° C. of 500 mm ² / s to 1,000 mm ² / s.   The method for lubricating a bearing part according to any one of claims 1 to 3, wherein the supply amount can be individually adjusted for a plurality of bearings in the bearing part.   The bearing portion according to any one of claims 1 to 4, wherein the lubricant oil supplied from the lubricant oil supply means is supplied by adjusting a supply amount in accordance with a traveling speed of the clip chain group. How to lubricate.   6. The method for lubricating a bearing portion according to claim 1, wherein the lubricating oil supply means is a gear pump.   The lubricating oil supplied from the lubricating oil supply means is supplied in the form of a mist by a gas-liquid mixing means provided in the middle of a supply pipe. A method of lubricating the bearing.   A method for producing a resin film, wherein the method for lubricating a bearing portion according to any one of claims 1 to 7 is used.

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