KR20120030016A - Method of producing sheet joined body and apparatus for producing sheet joined body - Google Patents

Abstract

PURPOSE: Producing method and apparatus for a sheet assembly are provided to prevent the breaking of a joint from a rear processing region, and to combine a resin sheet member without stopping a returning process of a sheet member. CONSTITUTION: A producing method for a sheet assembly comprises the following: supporting the tip end of a second resin sheet member(1b); spreading a light absorbing agent to the tip end of the second resin sheet member; laminating a first resin sheet member(1a) flowing from the upper side, and discharging the laminated first resin sheet member to the lower direction; returning the first resin sheet member to a processing region through a sheet lamination unit having the same carrying-in speed and carrying-out speed of the first resin sheet member; returning the first resin sheet member on the lower side of the sheet lamination unit, and stopping the returning process of the first resin sheet member on the upper side of the sheet lamination unit; cutting the first resin sheet member, and folding the tip end and the cut end of the first resin sheet member using a light absorbing agent; and fusing the ends using a laser.

Description

The manufacturing method of a sheet joined body, and the manufacturing apparatus of a sheet joined body {METHOD OF PRODUCING SHEET JOINED BODY AND APPARATUS FOR PRODUCING SHEET JOINED BODY}

This invention relates to the manufacturing method of the sheet | seat joined body which bonds two or more resin sheet members by irradiating a laser beam, and produces a sheet bonded body, and the manufacturing apparatus of a sheet bonded body.

Conventionally, in the image display apparatuses, such as a liquid crystal display device, the optical film containing a polarizing film etc. is used.

As a manufacturing method of this kind of polarizing film, a raw material film (resin sheet member) is sent out from a raw material roll in which a resin sheet member such as a band-shaped polyvinyl alcohol-based resin (PVA) film as a raw material is wound in a roll shape A method of restricting the movement path of the raw material film and passing it through an apparatus having a plurality of rollers for guiding the raw material film and various chemical baths is adopted. For example, the raw material film is moved in its longitudinal direction and swelled. After continuously immersing in a bath or a dyeing bath, the method of nipping a raw material film with the said roller in 2 places before and behind, and applying the tension in between, and performing the said extending | stretching is employ | adopted.

By the way, in the manufacturing method of this kind of polarizing film, it is wasteful and time-consuming to wind up a new raw material film again by rolling a roller etc. every time the raw material roll is replaced, and since it wastes time, it is the end part of the preceding raw material film The front-end | tip part of the raw material film unwound from the next raw material roll is bonded together, the sheet joined body is produced, and the two raw material films are processed in succession to a polarizing film sequentially.

Conventionally, as a manufacturing method of such a sheet joined body, adhesive bonding means, such as an adhesive tape and an adhesive agent, the suture joining means by a rivet, a seal | etc., Etc., the heat-melting joining means by a heat sealer, etc. are employ | adopted.

However, each of the above methods has the following problems.

ㆍ Problem in adhesive bonding by adhesive tape or adhesive

In the process of immersing the raw material film in the swelling bath, dye bath, etc., the components of the adhesive start to dissolve in the chemical liquid, contaminating the chemical liquid, and causing the adhesion of foreign substances to the product. Bonding strength falls by swelling by the component of a chemical | medical solution, and there exists a possibility of breaking a connection part before reaching a desired draw ratio in an extending process.

ㆍ Problems in Suture Bonding by Rivets or Threads

In this method, since a hole for passing a rivet or a thread is formed in the raw material film, there is a fear that breakage based on the hole will occur when tension is applied to the connecting portion.

In order to prevent this, when the number of holes is reduced and the gaps between the holes are secured, wrinkles are likely to occur when tension is applied, and there is a fear of stretching nonuniformity.

ㆍ Problem in hot melt bonding by heat sealer

As a joining means which can solve the problem in the above-mentioned adhesive bonding or suture joining, the means which joins by the heat sealer as disclosed in following patent documents 1 and 2 etc. is known.

In this method, the chemical liquid is less likely to be contaminated than adhesive bonding, and there is no need to form a hole like a sealing joint.

However, in the heat sealer, the welding region and its periphery tend to be denatured by heat received during welding and to be in a hardened state as compared with the normal portion.

Therefore, when tension is applied between these welding regions during stretching, stress tends to be concentrated at the boundary between the cured portion and the portion in a normal state, and the region is formed before the entire stretching ratio is desired. There is a fear of being stretched extremely.

Therefore, when extending | stretching at a high draw ratio has been performed, there exists a possibility of breaking of a raw material film in a connection part.

Japanese Patent Laid-Open No. 2007-171897 Japanese Patent Laid-Open No. 2010-8509

For example, in order to give a high polarization function to a polarizing film, although extending | stretching of 5.25 times or more is generally required, the raw material film which consists of polyvinyl alcohol-type resins is mentioned to the manufacturing method of the conventional sheet joined body as shown above. In this case, the connecting portion cannot withstand the stretching load of 5.25 times or more, which may cause breakage. Therefore, a measure is taken to avoid the breaking by changing the stretching ratio during the passage of the connecting portion to less than 5.25 times.

However, in the case where the above-mentioned workaround is selected, work is complicated to change the setting. Moreover, since the draw ratio before and behind a connection part does not become a desired magnification (5.25 times or more), it cannot use as a product and there exists a possibility of generating material loss.

That is, in the manufacturing method of the conventional sheet bonding body, when manufacturing a polarizing film, it had a problem that it was difficult to manufacture the polarizing film which has a high polarization function efficiently.

On the other hand, as described above, when the front end portion of the next raw material roll is joined to the distal end of the preceding raw material film, the cumbersomeness of wrapping the new raw material film on a roller or the like every time the raw material roll is replaced can be avoided. . However, since the unwinding of the raw material film is stopped once in order to join such a distal end and the tip, and the conveyance of the raw material film is stopped during this stop, the stretching is stopped during that time. There was also a problem of this deterioration.

In view of the above problems, the present invention prevents the bonding portion from breaking in the processing region at the rear end such as impregnation or stretching into the chemical liquid, and does not stop the conveyance of the resin sheet member to the processing region at the time of bonding, without causing the resin sheet member to stop. The object of this invention is to provide the manufacturing method of the sheet joined body which can be bonded together, and the manufacturing apparatus of a sheet joined body.

The manufacturing method of the sheet joined body which concerns on this invention for solving the said subject,

It is a manufacturing method of the sheet joined body which joins the 1st resin sheet member previously conveyed to a process area | region and the following 2nd resin sheet member among two or more strip-shaped resin sheet members, and produces a sheet joined body,

1st process of holding the front-end | tip part of a said 2nd resin sheet member,

A second step of applying a light absorbing agent to the tip portion held in the first step;

By carrying out the accumulated said 1st resin sheet member to a downstream side, accumulating the said 1st resin sheet member carried in from an upstream side, through the sheet | seat accumulating part comprised so that the carrying-in speed | rate of a said 1st resin sheet member may differ. While conveying the said 1st sheet member to the said process area | region and conveying of the said 1st sheet member on the downstream side of the said sheet | seat accumulation part, the conveyance of the said 1st sheet member is stopped and upstream of the said 1st resin sheet A third step of holding the member,

A fourth step of cutting the first resin sheet member held in the third step so that the held part constitutes an end portion;

A fifth step of overlapping the tip end portion and the end portion with the light absorbing agent sandwiched therebetween;

A sixth step of bonding by performing laser welding while pressing the tip and end portions superimposed in the fifth step;

And a seventh step of releasing pressurization to the tip and end portions, and holding the tip and end portions, and conveying the second resin sheet member to the treatment region following the first resin sheet member.

Thereby, since the distal end of the preceding first resin sheet member and the distal end of the next second resin sheet member in the two or more strip-shaped resin sheet members are joined by laser welding, the first resin sheet member is followed by the first agent. When processing the 2nd resin sheet member joined with 1 resin sheet member, when it is immersed in the chemical liquid, for example, compared with the case of adhesive bonding by use of an adhesive agent etc., a chemical liquid is contaminated or the bonding strength is performed by the said chemical liquid. The risk of lowering can be suppressed.

In addition, by performing laser welding, when extending | stretching, for example, when extending | stretching a 1st and 2nd resin sheet member continuously, it is possible to avoid generation | occurrence | production of a fracture at the boundary of a junction part and a non-junction part. In addition, even when extending | stretching a junction part, extending | stretching can be performed continuously without changing extending | stretching conditions.

Furthermore, since the 1st resin sheet member is conveyed through a sheet | seat accumulating part, conveyance of the said 1st resin sheet member to the process area | region is continued, even if the 1st resin sheet member is hold | maintained while joining the said terminal part and the said front-end | tip part. It becomes possible.

Therefore, the bonding of the resin sheet member can be performed without stopping the conveyance of the resin sheet member to the processing region at the time of bonding, while preventing the bonding portion from breaking in the processing region at the rear end such as impregnation or stretching into the chemical liquid.

Moreover, in the manufacturing method of the sheet joined body which concerns on this invention, it is preferable to have an 8th process which collect | recovers the unnecessary part by winding up the unnecessary part produced | generated by the cutting | disconnection in the said 4th process in the said 1st resin sheet member. Do.

As a result, the unnecessary portion can be easily removed.

Moreover, in the manufacturing method of the sheet joined body which concerns on this invention, it is preferable that the said resin sheet member is a single layer of a thermoplastic resin film.

Thereby, a sheet bonding body becomes easy to manufacture.

Moreover, in the manufacturing method of the sheet bonding body which concerns on this invention, it is preferable that the said resin sheet member is a polyvinyl alcohol-type resin film for producing a polarizing film.

Thereby, since extending | stretching is possible without breaking, when extending | stretching process is performed at a back end, it becomes possible to give a high polarization function to a polarizing film. Moreover, since it becomes possible to perform a extending | stretching process continuously without changing a draw ratio, it becomes possible to avoid generation | occurrence | production of a material loss. Therefore, it becomes possible to manufacture the polarizing film which has a high polarization function efficiently.

Moreover, the manufacturing apparatus of the sheet bonding body which concerns on this invention is

It is a manufacturing apparatus of the sheet | seat joined body which joins the 1st resin sheet member previously conveyed to a process area | region, and the following 2nd resin sheet member among two or more strip-shaped resin sheet members, and produces a sheet joined body,

It is comprised so that the carrying-in speed | rate of a said 1st resin sheet member and a carrying-out speed may differ, by carrying out the accumulated said 1st resin sheet member to a downstream side, accumulating the said 1st resin sheet member carried in from an upstream, and On the upstream side, the sheet accumulator which enables the stop of conveyance of the said 1st resin sheet, continuing conveyance of the said 1st resin sheet to the said process area | region,

A first holding portion disposed upstream from the sheet accumulating portion and holding the first resin sheet member in accordance with a conveyance stop of the first resin sheet member;

A cutting portion for cutting the first resin sheet member such that a portion held by the first holding portion constitutes an end portion;

A second holding part for holding a tip of the second resin sheet member;

An applicator for applying a light absorbent to a distal end held by the second holding part;

An arrangement adjusting unit for adjusting the distal end portion and the distal end portion so that the distal end portion and the distal end sandwich the light absorbing agent and overlap each other;

A pressing portion for pressing the overlapping portions of the tip and distal ends;

A laser beam irradiation unit for irradiating a laser beam to the overlapping portion pressed by the pressing unit, and bonding the distal end portion and the distal end portion by laser welding;

It is comprised so that the said 2nd resin sheet member may be conveyed to the said process area | region following the said 1st resin sheet member by releasing pressurization to the front-end | tip part and terminal part by the said press part, and holding | maintenance of the said front-end part and terminal part. It is done.

Thereby, since the distal end of the preceding first resin sheet member and the distal end of the next second resin sheet member in the two or more strip-shaped resin sheet members are joined by laser welding, the first resin sheet member is followed by the first agent. When processing the 2nd resin sheet member joined with 1 resin sheet member, when it is immersed in chemical liquid, for example, compared with the case of adhesive bonding by use of an adhesive agent etc., a chemical liquid is contaminated or it is bonded by the said chemical liquid. The risk of lowering the strength can be suppressed.

In addition, by performing laser welding, when extending | stretching, for example, when extending | stretching a 1st and 2nd resin sheet member continuously, it is possible to avoid generation | occurrence | production of a fracture at the boundary of a junction part and a non-junction part. In addition, even when extending | stretching a junction part, extending | stretching can be performed continuously without changing extending | stretching conditions.

Furthermore, since the 1st resin sheet member is conveyed through a sheet | seat accumulating part, conveyance of the said 1st resin sheet member to the process area | region is continued, even if the 1st resin sheet member is hold | maintained while joining the said terminal part and the said front-end | tip part. It becomes possible.

Therefore, the bonding of the resin sheet member can be performed without stopping the conveyance of the resin sheet member to the processing region at the time of bonding, while preventing the bonding portion from breaking in the processing region at the rear end such as impregnation or stretching into the chemical liquid.

Moreover, in the manufacturing apparatus of the laser bonding body which concerns on this invention, the said 1st resin sheet member is attached to the sending part which can wind the said 1st resin sheet member, The said sending part is the said cutting part in the said 1st resin sheet member. It is preferable that it is comprised so that the said unnecessary part may be collect | recovered by winding up the unnecessary part produced | generated by cutting | disconnecting by.

As a result, the unnecessary portion can be easily removed.

Moreover, in the manufacturing apparatus of the laser bonding body which concerns on this invention, it is preferable that the said resin sheet member is a single layer of a thermoplastic resin film.

Thereby, a sheet bonding body becomes easy to manufacture.

Moreover, in the manufacturing apparatus of the laser bonding body which concerns on this invention, it is preferable that the said resin sheet member is a polyvinyl alcohol-type resin film for producing a polarizing film.

Thereby, since extending | stretching is possible without breaking, when extending | stretching process is performed at a back end, it becomes possible to give a high polarization function to a polarizing film. Moreover, since it becomes possible to perform a extending | stretching process continuously without changing a draw ratio, it becomes possible to avoid generation | occurrence | production of a material loss. Therefore, it becomes possible to manufacture the polarizing film which has a high polarization function efficiently.

As described above, according to the present invention, the bonding sheet is prevented from breaking in the processing region at the rear end such as impregnation or stretching into the chemical liquid, and the conveyance of the resin sheet member to the processing region at the time of bonding is not stopped. Can be joined.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic side view which shows the bonding apparatus of one embodiment.
2 is a schematic side view of the accumulator.
3 is a schematic side view schematically showing a state in which a tip portion of a new raw material film is held.
4 is a schematic side view schematically showing a state in which a light absorber is applied to a tip end portion of a new raw material film.
FIG. 5 is a schematic side view schematically showing a state in which conveyance of an old raw material film is stopped on an upstream side of an accumulator; FIG.
Fig. 6 is a schematic side view schematically showing a state in which an old raw material film is held and is cut.
7 is a schematic side view schematically showing a state in which a new raw material film is moved to overlap with an old raw material film.
8 is a schematic side view schematically showing a state in which an overlapping portion is pressed;
9 is a schematic side view schematically showing a state in which a laser beam is irradiated to an overlapping portion.
Fig. 10 is a schematic side view schematically showing a state in which the pressing on the overlapping portion and the holding of the old and new raw material films are released.
It is a schematic side view which shows typically the state in which conveyance of the old and new raw material film was resumed.
It is a schematic side view which shows another example in the method of superimposing old and new raw material films.
It is a schematic perspective view which shows an example of the extending | stretching apparatus by which a new and old raw material film is conveyed.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described below.

First, the manufacturing method of the sheet joined body of this embodiment, and the manufacturing apparatus of a sheet joined body are demonstrated, referring drawings.

FIG. 1: is a schematic side view which shows typically an example of the bonding apparatus (manufacturing apparatus) 100 of this embodiment.

The bonding apparatus 100 is a distal end of the first resin sheet member (old raw material film) 1a that is sent out earlier among two or more strip-shaped resin sheet members (raw material film) 1 and conveyed to a processing step (processing region). And the front end of the next second resin sheet member (new raw material film) 1b, and the new raw material film 1b is continuously conveyed and processed in the processing step following the old raw material film 1a. have.

As two or more raw material films 1 joined by the bonding apparatus 100, if it has a thermoplastic resin layer on the surface joined together, it may be formed from the single | mono layer of a thermoplastic resin, and a thermoplastic resin layer and another resin layer are laminated | stacked. Although it may be formed and is not specifically limited, It is preferable that it is formed by the single layer of a thermoplastic resin. Thereby, manufacture of a sheet bonding body becomes easy. In addition, as such a resin sheet member, what consists of thermoplastic resins of the same kind is common, but this invention is not limited to the case of the same kind, If it is a material which can thermally fuse with each other, a different kind may be sufficient as it.

As such a thermoplastic resin, for example, polycarbonate, polyvinyl alcohol, polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, thermoplastic polyimide, triacetyl cellulose, polymethyl methacrylate, cycloolefin polymer, norbor Resin, polyoxymethylene, polyetheretherketone, polyetherimide, polyamideimide, polybutadiene, polyurethane, polystyrene, polymethylpentene, polyamide, polyacetal, polybutylene terephthalate, ethylene vinyl acetate Can be.

Moreover, in consideration of conveying such a resin sheet member with a roll to roll, it is preferable that the thickness is 1 micrometer or more and 2 mm or less, and it is preferable that they are 10 micrometers or more and 200 micrometers or less.

As the resin sheet member, it is preferable to use a polyvinyl alcohol-based resin film for producing a polarizing film, that is, a film made of a polyvinyl alcohol-based polymer resin material. Since it becomes possible to extend | stretch, it becomes possible to give a high polarization function to a polarizing film.

As such a polyvinyl alcohol-type resin film, a polyvinyl alcohol film, a partially saponified polyvinyl alcohol film, the dehydration film of polyvinyl alcohol, etc. can be used specifically ,.

The degree of polymerization of the polymer which is the forming material of the polyvinyl alcohol-based resin film is generally in the range of 500 to 10,000, preferably in the range of 1,000 to 6,000, and more preferably in the range of 1,400 to 4,000.

In the case of the partially saponified polyvinyl alcohol film, the saponification degree is preferably 75 mol% or more, for example, from the point of solubility in water, more preferably 98 mol% or more, and a range of 98.3 to 99.8 mol%. More preferred.

The bonding apparatus 100 includes a first sending part (feeding part) 21, a first holding part 22, a cutting part 23, a second sending part 24, a second holding part 25, and a stage 26. ), A laser beam irradiation part 27, a pressurizing part 28, an application part 29, a batch adjusting part 31, and an accumulator (sheet accumulating part) 32.

The 1st sending part 21 can rotate the old raw material film 1a wound by roll shape in the forward direction to which this is sent, and the reverse direction to wind up, and can send out the old raw material film 1a by rotating to a forward direction. . This first sending portion 21 is formed of a roller member on which the hollow portion of the wound raw material film 1a is mounted.

The first holding part 22 has a flat upper surface part, and this upper surface part is arranged below the old raw material film 1a sent out from the first sending part 21. In addition, a plurality of holes are formed in such an upper surface portion, and the old raw material film 1a is attracted to and held by the upper surface portion by a first suction member (not shown). And, as will be described later, when the feeding of the old raw material film 1a (conveying upstream of the accumulator 32) is stopped, the first suction member is operated in accordance with this stop, and the old raw material film 1a is removed. 1 is hold | maintained by the holding part 22. FIG.

The cut part 23 is for cutting the old raw material film 1a, and is formed by the blade 23a, the receiving part 23b, and the like. Such a cutting part 23 is the tip part 1ba of the new raw material film 1b mentioned later in the upstream (right side of FIG. 1) of the part hold | maintained by the 1st holding part 22 in the old raw material film 1a. ), Leaving the part overlapping with). By cutting by the cutting part 23 in this way, the old raw material film 1a is conveyed to a processing process so that the distal end part 1aa of the old raw material film 1a to be processed, and the unprocessed unnecessary part (refer FIG. 6) are formed. It is.

The 2nd sending part 24 can rotate the raw material film 1b wound by roll shape in the forward direction to which it is sent, and the reverse direction to wind up, and can send the raw material film 1b by rotating to a forward direction. . This second sending portion 24 is formed of a roller member on which the hollow portion of the wound raw material film 1b is mounted.

The 2nd holding part 25 has a flat upper surface part, and this upper surface part is arrange | positioned under the new raw material film 1b sent out from the 2nd sending part 24. As shown in FIG. In addition, a plurality of holes are formed in such an upper surface portion, and the new raw material film 1b is attracted to and held by the upper surface portion by a second suction member (not shown). And when the front-end | tip part 1ba of the raw raw material film 1b overlaps with the upper surface of the 2nd holding part 25 and the stage 26 mentioned later, delivery of the raw raw material film 1b will be stopped and the said stop will be made according to this stop. The second suction member is operated so that the tip portion 1ba is held by the second holding portion 25.

Moreover, the 1st sending part 21 and the 2nd sending part 24 are provided in the arrangement variable part 41 which can be rotated so that these positions may mutually exchange. And, as will be described later, after the bonding of the old and new raw material films 1a and 1b, the batch variable portion 41 is rotated so that the new raw material film 1b is positioned at the position (upper in FIG. 1) of the old raw material film 1a. In this position, the new raw material film 1b is unwound sequentially. At this time, the old raw material film 1a disposed below is removed from the batch variable part 41, and the next raw material film of the new raw material film 1a is newly mounted.

The stage 26 has a flat upper surface portion, and is disposed adjacent to the downstream side (right side in FIG. 1) of the second holding portion 25. As the material of the stage 26, metal, ceramics, resin, rubber, or the like can be used. Among them, it is preferable to use rubber as the material of the stage 26, whereby the overlapped portion of the distal end portion 1aa of the old raw material film 1a and the distal end portion 1ba of the new raw material film 1b as described later. When the pressurizing part 28 presses the stage 26, the wide area can be pressurized uniformly. Therefore, a favorable bonding state can be obtained in the said overlapping part by irradiation of the laser beam mentioned later. In addition, after joining the distal end portion 1aa and the distal end portion 1ba, in order to increase the peelability of the distal end portion 1aa and to increase the heat resistance, the surface of the rubber is surface-treated or a resin member is laminated on the surface of the rubber. It is also possible.

The laser light irradiation part 27 has a laser light source, and is disposed above the stage 26. In addition, the pressurizing part 28 is arrange | positioned above the stage 26 so that the movement to an up-down direction below the laser beam irradiation part 27 is possible. Then, the distal end portion 1aa of the preceding spherical raw material film 1a and the distal end portion 1ba of the new raw material film 1b bonded thereto are overlapped on the stage 26 up and down, and the overlapped portion is By irradiating the laser beam R from the laser beam irradiation section 27 while pressurizing the pressurizing section 28, the interface portion between the distal end portion 1aa and the distal end portion 1ba is heated to be melted and welded together. Moreover, the press part 28 is comprised with the transparent member excellent in the transmittance | permeability of the laser beam R. As shown in FIG.

Although the kind of said laser light source is not specifically limited, The laser beam to be used is apply | coated to the upper surface of the new raw material film 1b in the interface of the old and new raw material film in the part which overlapped the old and new raw material films 1a and 1b, etc. It is a thing which plays the role which absorbs by the light absorbing agent arrange | positioned as a heat | fever, and it has a wavelength with high absorption sensitivity of the light absorbing agent to be used.

Specifically, examples of the laser light include solid-state lasers such as semiconductor lasers, fiber lasers, femtosecond lasers, picosecond lasers and YAG lasers having wavelengths in the visible light region or the infrared region, and gas lasers such as CO ₂ lasers.

Among them, semiconductor lasers and fiber lasers, which are inexpensive and easily obtain an in-plane uniform laser beam, are preferable.

In addition, for the purpose of promoting melting while avoiding decomposition of the raw material film, the CW laser of continuous wave is preferable to the pulse laser to which high energy is instantaneously applied.

The laser light output (power), beam size and shape, the number of irradiations, and the scanning speed, etc., are characterized by optical characteristics such as light absorption of the raw material film and the light absorbing agent, the melting point of the polymer constituting the raw material film, and the glass transition point. Although it may be appropriately optimized for a difference in thermal characteristics such as (Tg), in order to efficiently fluidize the polyvinyl alcohol-based resin in the irradiated portion to obtain a firm bond, the power density of the irradiated laser light is 200 W. It is preferably in the range of / cm ² to 10,000W / cm ² , more preferably in the range of 300W / cm ² to 5,000W / cm ² , and particularly in the range of 1,000W / cm ² to 3,000W / cm ² . desirable.

In addition, it is preferable that the said laser light source can irradiate a laser beam with the spot diameter (irradiation width) of predetermined magnitude | size at the interface of old and new raw material films 1a and 1b.

As this irradiation spot diameter (irradiation width), the power which satisfy | fills the said irradiation laser power density is preferable at least the half value or more and 3 times or less of the overlap width of the old and new raw material films 1a and 1b.

If it is less than the half value of an overlap width, the unbonded part of an overlap part is large and there exists a possibility that it may fall and convey favorable conveyance when conveying after joining.

Moreover, when irradiating a laser beam with the width | variety 3 times or more does not affect bonding and extending | stretching characteristic, it is not preferable from a viewpoint of energy utilization efficiency.

Preferably it is more than 2 times the same value as an overlap width.

Moreover, it is preferable to make the overlap width of the old and new raw material films 1a and 1b into 0.1 mm or more and less than 10.0 mm, and it is more preferable to set it as 0.5 mm or more and less than 5 mm.

This is because when the overlap width is less than 0.1 mm, it is difficult to repeatedly overlap the high-precision and wide raw material film 1, and when it is 10.0 mm or more, the laser beam is irradiated to 10.0 mm width or more to prevent the formation of unbonded portions. This is because the energy required increases, which is not preferable in view of energy saving.

In addition, as the laser light integrated irradiation dose of 5J / cm ² to 400J / cm ² within the range of preferably, more preferably within the range of 10J / cm ² to 300J / cm ^2, and 30J / cm ² to 150J / cm ² It is especially preferable to exist in the range.

Therefore, it is preferable to employ | adopt the laser beam irradiation part 27 which has a laser light source which can satisfy these conditions for the bonding apparatus 100. FIG.

Moreover, the said press part 28 has the glass pressing member which shows high transparency with respect to the laser beam to be used.

As the pressure intensity at the time of irradiation of the laser beam preferably in the range of 0.5 to 100kgf / cm ^2, more preferably in a range of 10 to 70kgf / cm ^2.

Therefore, the shape of the glass member is not particularly limited as long as it is a member that can pressurize at such strength as the pressing member, and for example, a flat plate, a cylinder, or a spherical shape can be used.

Although the thickness of a glass member is not specifically limited, When too thin, favorable pressurization is impossible by distortion, and when too thick, the utilization efficiency of a laser beam will fall, It is preferable that the thickness in the direction which a laser beam transmits is 3 mm or more and less than 30 mm. It is more preferable that it is 5 mm or more and less than 20 mm.

As a material of a press member, quartz glass, an alkali free glass, tempax, Pyrex, bicore, D263, OA10, AF45 etc. are mentioned, for example.

In order to raise the utilization efficiency of a laser beam, it is preferable that the glass member used as a press member has high transparency with respect to the laser beam wavelength used, It is preferable to have a light transmittance of 50% or more, and has a light transmittance of 70% or more. More preferred.

In addition, in the case where the pressing member is formed using the above glass member, the cushioning property is better than that of the glass member in the portion in contact with the raw material film so as to press the wider area more uniformly so that good bonding can be performed over the whole area. It is also possible to form an excellent cushion layer.

That is, the pressure member provided with the rubber sheet | seat with favorable light transmittance, the transparent resin sheet etc. which have cushion characteristics, etc. can also be employ | adopted, For example, the back side is comprised by the glass member, The front surface side which contact | connects a raw material film is a transparent rubber sheet. The pressurization part 28 comprised by this can be employ | adopted.

For the formation of the cushion layer, for example, rubber materials such as silicone rubber and urethane rubber, and resin materials such as polyethylene can be used.

It is preferable that the thickness of this cushion layer is 50 micrometers or more and less than 5 mm, and 1 mm or more and less than 3 mm are more preferable.

If the thickness is less than 50 µm, the cushioning property is insufficient. If the thickness is 5 mm or more, absorption or scattering of the laser light occurs due to the cushion layer, which may lower the energy of the laser light reaching the contact interface between the distal end portion 1aa and the distal end portion 1ba. Has

It is preferable that this cushion layer has a light transmittance of 30% or more, and more preferably 50% or more with respect to the laser light wavelength to be used.

In addition, the same cushion layer as this cushion layer can also be arrange | positioned on the upper surface of the stage 26. FIG.

In the laser beam irradiation part 27 of this embodiment, it is preferable that it is comprised so that laser welding may be performed along the overlapping part of the overlapping new and old raw material film 1a, 1b, and the joining part which is a linear welding part can be formed. For example, by shaping a line-shaped laser beam by the use of an optical member such as a cylindrical lens or a diffractive optical element or a mechanism for scanning a spot beam focused at a desired beam size by a condenser lens along an overlapping portion, It is preferable to provide a mechanism for irradiating the overlapped portion of the raw material film, and further, a mechanism for batch melting and heating bonding by arranging a plurality of laser light sources along the overlapped portion and simultaneously irradiating by non-scanning.

In addition, the above-described coating portion 29 is such that the light absorbing agent is applied to the upper surface of the portion loaded on the stage 26 in the tip portion 1ba of the new raw material film 1b held by the second holding portion 25. It is. The application of such a light absorbent improves the light absorption of the laser light at the interface between the distal end portion 1aa and the distal end portion 1ba, whereby welding can be performed more efficiently.

The light absorbing agent used herein is not particularly limited as long as it absorbs laser light to generate heat, and carbon black, pigments, dyes and the like can be used.

For example, a phthalocyanine-based absorbent, a naphthalocyanine-based absorbent, a polymethine-based absorbent, a diphenylmethane-based absorbent, a triphenylmethane-based absorbent, a quinone-based absorbent, an azo-based absorbent, a diimium salt, or the like can be used.

In addition, when using the laser light source which emits the laser beam which has a wavelength of 800 nm-1200 nm, the light absorbing agent marketed as a brand name "Clearweld" by Gentex, Inc. can be used, for example. .

These absorbents can be diluted with an organic solvent or the like and applied by the coating unit 29. As the coating unit 29, for example, a dispenser, an ink jet printer, a screen printing machine, a two-fluid type, a one-fluid type or an ultrasonic spray, General coating devices, such as a stamper and a coater, can be employ | adopted.

The disposition adjustment part 31 is a distal end portion 1aa of the old raw material film 1a held by the first holding part 22 and a new raw material film held by the second holding part 25 and coated with a light absorbing agent ( It is for adjusting the arrangement of the old and new raw material films 1a and 1b so that the tip portion 1ba of 1b overlaps with the light absorbing agent on the stage 26, and in this case, the second holding portion 25 and the stage 26. ), The second holding portion 25 is configured to move toward the position adjacent to the first holding portion 22 with the stage 26 sandwiched therebetween. Moreover, the part shown with the broken line of FIG. 1 is comprised so that it may move with a 2nd holding part. In addition, in this invention, when the said terminal part 1aa and the front-end part 1ba are comprised so that a superimposition is possible, only the 1st holding part 22 may be comprised so that the 1st holding part 22 and the 2nd may move. Both the holding portion 25 and the stage 26 may be configured to move.

The accumulator 32 carries out the accumulated old raw material film 1a to the downstream side while accumulating the old raw material film 1a carried in from the upstream side, so that the carrying-in speed | rate of an old raw material film 1a and a carrying out speed may differ. It is comprised and accumulate | stores the old raw material film 1a so that conveyance of the old raw material film 1a to the subsequent process process (processing apparatus) can continue even if conveyance of the old raw material film 1a is stopped on the upstream side. It is possible. Such an accumulator 32 is arrange | positioned downstream of the 1st holding part 22 (left side of FIG. 1), as shown in FIG. 1, and as shown in FIG. 2, the old raw material film 1a spreads. The paper has a first roller 33, a second roller 34, a third roller 35, a fourth roller 36, and a fifth roller 37.

Among these rollers, the first roller 33, the second roller 34, and the third roller 35 are fixedly arranged. Moreover, the 4th roller 36 is arrange | positioned so that it can move to an up-down direction between the 1st roller 33 and the 2nd roller 34, and the 5th roller 37 is the 2nd roller 34 And below the third roller 35 so as to be movable in the vertical direction.

These fourth and fifth rollers 36 and 37 are arranged in the lowermost home position, whereby the old raw material film 1a is to be accumulated in the accumulator 32. And as shown in FIG. 2, when conveyance of the old raw material film 1a is stopped in the upstream of the accumulator 32, 4th and 5th rollers 36 and 37 move upwards according to this stop. And the conveyance of the raw material film 1a to the process process of a later stage is made to continue. In addition, when the old raw material film 1a and the new raw material film 1b are bonded together, and the new raw material film 1b is conveyed following the old raw material film 1a, as described later, the fourth and fifth rollers 36, 37 moves downward to the home position, and the new raw material film 1b is accumulated in the accumulator 32 after the old raw material film 1a.

In addition, the moving speed and the moving distance of the 4th and 5th rollers 36 and 37 upwards are the old and new raw materials after bonding of the old and new raw material films 1a and 1b from the conveyance stop of said old raw material film 1a. While the conveyance of the films 1a and 1b is started, it is set according to the speed and distance to which the old raw material film 1a is conveyed by the process process of a later stage. In addition, the moving speed of the 4th and 5th rollers 36 and 37 below is set at the speed which does not inhibit conveyance of the old and new raw material films 1a and 1b to the process process of a later stage.

In addition, the quantity, arrangement | positioning, etc. of the roller provided in the accumulator 32 are not specifically limited if the said conveyance of the old raw material film 1a to the process process of a later stage is possible. In addition, although the roller pair 38 which guides conveyance of the old raw material film 1a is arrange | positioned here in the upstream (right side of FIG. 2) of the 1st roller 33, such a roller pair 38 is not provided. It may be set as a structure, and may be set as a structure which provides a some roller pair as needed.

Next, the manufacturing method of the sheet bonding body by said bonding apparatus 100 is demonstrated.

The old raw material film 1a is sent out from the first sending part 21 and passed through the accumulator 32 to the subsequent processing step, and in this state, the old raw material film 1a and the new raw material film 1b. To be bonded. First, the new raw material film 1b is sent from the second sending section 24 toward the second holding section 25. When the distal end portion 1ba of the sent raw material film 1b is disposed above the second holding portion 25 and the stage 26, the feeding of the raw material film 1b is stopped, and the above-described first material 1b is stopped. The 2 suction members operate, and the tip part 1ba is hold | maintained by the 2nd holding part 25 as shown in FIG. 3 (1st process). In addition, as shown in FIG. 4, the light absorbing agent is apply | coated to the upper surface of the front end part 1ba on the stage 26 by the application part 29 (refer FIG. 1) (2nd process).

Subsequently, as shown in FIG. 5, the feeding of the old raw material film 1a is stopped on the upstream side of the accumulator 32, and in accordance with such a stop, the fourth and fifth portions as shown in FIG. 2 described above. As the rollers 36 and 37 move upwards and continue conveyance of the raw material film 1a to the subsequent process, as shown in FIG. 6, the said 1st suction member is operated and old raw material film 1a is carried out. It is hold | maintained by this 1st holding part 22 (3rd process).

In addition, as shown in FIG. 6, the old raw material film 1a held by the 1st holding part 22 is cut | disconnected by the 23 and the 1st holding part 22 in the old raw material film 1a is carried out. In the upstream side (right side of FIG. 6) of the part hold | maintained at the cutting part, it cut | disconnects leaving the part which overlaps with the front-end | tip part 1ba of the new raw material film 1b, and by this cutting, the old raw material film 1a is processed into a process process. The distal end portion 1aa of the old raw material film 1a to be conveyed and processed, and the unneeded unprocessed portion are formed (fourth step).

After this cutting, the first sending part 21 is rotated in the reverse direction, and the unnecessary part in the old raw material film 1a is wound and recovered (eighth step).

After the cutting, as shown in FIG. 7, the second holding portion 25 and the stage 26 on which the front end portion 1ba of the new raw material film 1b is held by the arrangement adjusting portion 31 (see FIG. 1). ) Moves so that the second holding portion 25 is disposed at a position adjacent to the first holding portion 22 with the stage 26 interposed therebetween, and the distal end portion 1aa on the stage 26. The tip part 1ba is overlapped by sandwiching a light absorber (5th process).

Subsequently, as shown in FIG. 8, the distal end portion 1aa and the tip portion 1ba superimposed on the stage 26 are pressed against the stage 26 by the pressing portion 28 from above and shown in FIG. 9. As described above, the laser beam R is irradiated from the upper portion of the pressing portion 28 with respect to the overlapping portion of the distal end portion 1aa and the distal end portion 1ba by the laser beam irradiation portion 27 (see FIG. 1), and the distal portion 1aa. And the tip 1ba are joined by laser welding (sixth step).

Then, after such laser welding, as shown in FIG. 10, the press part 28 raises, the pressurization of the distal end part 1aa and the front end part 1ba by the said press part 28 is released, and the said 1st And the holding of the distal end portion 1aa and the distal end portion 1ba by the first and second holding portions 22 and 25 is released by the operation of the second suction member to stop, and as shown in FIG. Next to (1a), the new raw material film 1b is conveyed (7th process). At this time, arrangement | positioning of the old raw material film 1a and the new raw material film 1b is replaced by the arrangement variable part 41 (refer FIG. 1). In addition, the fourth and fifth rollers 36 and 37 (refer to FIG. 1) move downward in accordance with the start of conveyance of the old and new raw material films 1a and 1b, followed by the old raw material film 1a and the new raw material film 1b. ) Is accumulated in the accumulator 32.

As described above, the distal end portion 1aa of the old raw material film 1a and the distal end portion 1ba of the new raw material film 1b are joined to form a sheet bonded body, thereby forming a spherical bond to a subsequent process at the time of bonding of both films. It can avoid that conveyance of the raw material film 1a is stopped. And the new raw material film 1b is continuously conveyed and processed after the old raw material film 1a. In addition, by repeating the bonding of the old and new raw material films 1a and 1b in this manner, the two or more raw material films 1 can be successively joined in succession, and can be conveyed in a subsequent processing step.

Further, the raw material film 1a is sequentially and successively removed by removing the old raw material film 1a moved downward by the batch variable portion 41 (see FIG. 1) and attaching the next raw material film of the new raw material film 1b. Can be bonded.

In addition, although it is not explained in full detail here, the said bonding apparatus 100 can employ | adopt the various mechanism used in the general laser welding apparatus and its peripheral apparatus. In addition, in the said embodiment, after cut | disconnecting the old raw material film 1a, the old raw material film 1a and the new raw material film 1b were bonded, but other raw material film (as shown in FIG. 12, for example) 1a) and a part of the front end of the new raw material film 1b are overlapped and cut, and then the rear end 1aa of the old raw material film 1a formed by this cutting and the front end of the new raw material film 1ba are joined. It may be.

Specifically, during the conveyance of the old raw material film 1a, the new raw material film 1b is sent out, and a part of the tip portion in the longitudinal direction is held by the second holding portion 25, and a light absorbing agent is placed on the top surface of the tip portion. It apply | coats (FIG. 12 (a)). In addition, the feeding of the old raw material film 1a is stopped and the accumulator 32 is operated (see FIG. 2) so that the old raw material film 1a is overlapped from above the new raw material film 1b to hold the first. It is hold | maintained by the support part 22 (FIG. 12 (b)). Subsequently, the receiving portion 23b of the cutout portion 23 is raised, and the old and new raw material films 1a and 1b are cut by the cutout portion 23 (Fig. 12 (c)), thereby disposing the distal end portion of the old raw material film 1a. 1aa and the tip 1ba of the new raw material film 1b are formed.

Moreover, while collecting the unnecessary part of both films which generate | occur | produced by cutting, the accommodating part 23b is lowered (FIG. 12 (d)). And the raw material film 1b is made by making the 2nd holding part 25 approach the 1st holding part 22 by the arrangement | positioning adjusting part 31 (not shown in FIG. 12). After the end portion 1aa of the raw material film 1a is superimposed on the upper surface 1ba of which the light absorbing agent is applied, the stage 26 is raised and the pressing portion 28 is lowered (FIG. 12). (F)), while pressing the overlapping portion of the distal end 1aa and the distal end 1ba by the pressing portion 28 to the stage 26, the laser beam R is irradiated to the overlapping portion to distal the distal end 1aa and the distal end portion ( 1ba) is bonded. Thereafter, as shown in FIGS. 10 and 11 described above, the raw material film 1b can be continuously conveyed to the old raw material film 1a by releasing the pressing and holding of the distal end 1aa and the distal end. have.

Moreover, the chemical | medical solution process, an extending | stretching process, etc. are mentioned as a process process of the back stage by which the sheet | seat bonding body (old raw material film 1a and new raw material film 1b) produced by the said bonding apparatus 100 is conveyed. In addition, when the polyvinyl alcohol-type resin film for producing a polarizing film is used as the raw material film 1, the extending | stretching process process using the extending apparatus (processing apparatus) 50 as shown in FIG. 13 is mentioned. Can be. In addition, in FIG. 13, the part 30 (welded part) joined by laser welding is shown with the part 30 which blackened.

As shown in FIG. 13, in the extending | stretching apparatus 50 for manufacturing a polarizing film, the old raw material film 1a and the new raw material film 1b (raw material film 1) conveyed from the bonding apparatus 100 are prescribed | regulated. A plurality of immersion baths 4 for immersing in the chemical liquid, a plurality of rollers 9 for restricting a movement path of the raw material film 1 so as to pass the raw material film 1 into the immersion bath 4, Stretching means for stretching the raw material film 1 in the movement path, and a polarizing film winding portion 10 for winding the stretched film in a roll shape as a polarizing film is immersed in the plurality of immersion baths 4 are provided.

Moreover, on the upstream side of the winding-up part 10 while being downstream of the immersion bath 4, the drying apparatus 11 which dry | cleans the washing | cleaning liquid adhered to a film, specifically, the drying oven is provided. Moreover, the film 12 for lamination | stacking, such as a surface protection film (for example, a triacetyl cellulose film or a cycloolefin polymer film) wound in roll shape, is arrange | positioned at the both sides of the film dried by the said drying apparatus 11, respectively. The laminate apparatus for laminating | stacking the film 12 for lamination | stacking is provided in both surfaces of the film after drying.

By this stretching apparatus 50, it extends in the longitudinal direction so that the total draw ratio which the raw material film 1 accumulate | stacked may be 2-8 times, Preferably it extends in the longitudinal direction so that it may become 5.25-8 times, The polarizing function excellent in the obtained polarizing film can be provided.

Although the manufacturing method of the sheet bonded body of this embodiment and the manufacturing apparatus of a sheet bonded body are as above, this invention is not limited to this embodiment, Design can be changed suitably within the range which this invention intends.

<Examples>

Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

(Example 1)

The following resin sheet member and conditions were used.

ㆍ Material film: triacetyl cellulose resin (TAC) film (manufactured by Fuji Film Co., Ltd., thickness 80㎛, width 1,330mm)

Nesting width: 1.5mm width

Heating melt bonding means: laser

Laser: semiconductor laser (wavelength 940 nm, power 80 W, spot diameter ² mm φ, power density 2,547 W / cm ² , scanning speed 70 mm / sec, integrated dose 102 J / cm ² , top hat beam)

ㆍ Light absorbing agent: 10 nL / mm ² coated with 5.0 mm width on the upper surface of the new raw material film disposed under the trade name "Clearwell LD120C" (manufactured by Gentex, USA, 30% absorption rate of light having a wavelength of 940 nm, solvent acetone).

Pressure member: Flat plate of fused quartz glass (15 mm thick)

And the pressing condition: pressing a weighted 50kgf / cm ² in the portion overlapping the raw film

Said old TAC film was conveyed at the conveyance speed of 30 m / min, and tension | tensile force 300N, and was conveyed to the saponification bathtub of the extending | stretching apparatus. During conveyance of such an old TAC film, the old TAC film and the new TAC film are bonded together as shown in FIGS. 3 to 11 using the above conditions, and the old TAC film is followed by the new TAC film in a saponified bath. It conveyed and passed this.

As a result, while conveying old TCA film is stopped upstream of the accumulator 32 and bonding old and new TAC film, conveyance of an old TAC film to a saponification bath is favorable, and conveyance of an old and new TCA film after bonding Even after starting, the conveyance of a new and old TAC film to the saponification bathtub was favorable. In addition, no breakage was observed between the old TAC film and the new TAC film after passage of the saponified bath, and the bonding was good.

(Example 2)

As the resin sheet member of the old and new, a polyvinyl alcohol resin (PVA) film (manufactured by Kuraray Co., Ltd., thickness of 75 μm, width 3,000 mm) is used, and the stretching ratio in the stretching apparatus as shown in FIG. 13 is swelling bath. Stretched to 2.6 times, 3.4 times in a dyeing bath, 3.6 times in a crosslinking bath, and 6.0 times in a stretching bath, and then bonded the old PVA film and the new PVA film in the same manner as in Example 1 except that the washing bath was passed. The new PVA film was extended to the old PVA film.

As a result, while bonding a new and old PVA film, conveyance of the old PVA film to the extending | stretching apparatus was favorable, and even after starting a conveyance of a new and old PVA film after bonding, conveyance of the old and new PVA film to the stretching apparatus was favorable. . Moreover, in the extending | stretching apparatus, after extending | stretching through each chemical | medical solution tank, the fracture was not confirmed between the old PVA film and the new PVA film, and the adhesiveness was favorable. Moreover, even when it extended | stretched by draw ratio 6.0 times, break was not recognized and the stretchability was also favorable.

(Comparative Example 1)

A pressure-sensitive adhesive (acrylic pressure sensitive adhesive; manufactured by Nitto Denko, No.5000NS 160 μm thick) was used as the bonding means, and the acrylic pressure sensitive adhesive was attached to the upper surface of the front end of the new PVA film, and the front end and the end of the old PVA film were joined. A new and old PVA film was stretched in the same manner as in Example 2 except for the one.

As a result, while bonding a new and old PVA film, conveyance of the old PVA film to the extending | stretching apparatus was favorable, and even after starting a conveyance of a new and old PVA film after bonding, conveyance of the old and new PVA film to the stretching apparatus was favorable. . However, in the stretching bath, breakage was confirmed between the old PVA film and the new PVA film.

(Comparative Example 2)

A new and old PVA film was stretched in the same manner as in Example 2 except that the front end portion of the new PVA film and the end portion of the old PVA film were joined by a heat sealer (3 mm width of nichrome wire, temperature 200 ° C., 10 seconds).

As a result, while bonding a new and old PVA film, conveyance of the old PVA film to the extending | stretching apparatus was favorable, and even after starting a conveyance of a new and old PVA film after bonding, conveyance of the old and new PVA film to the stretching apparatus was favorable. . However, since breaking occurred at the stretch of 4 times the draw ratio, it was impossible to stretch to the target draw ratio of 5.25 times in terms of obtaining a polarizing film.

1: Raw material film (resin sheet member)
1a: Old raw material film (first resin sheet member)
1aa: distal end
1b: New raw material film (second resin sheet member)
1ba: tip
21: first delivery unit (distribution unit)
22: first holding portion
23: cutout
24: second delivery unit
25: second holding part
26: stage
27: laser light irradiation unit
28: pressurization
29: applicator
31: batch adjustment unit
32: Accumulator (Sheet Accumulator)
33: first roller
34: second roller
35: third roller
36: fourth roller
37: fifth roller
100: bonding apparatus (manufacturing apparatus)

Claims (8)

It is a manufacturing method of the sheet joined body which joins the 1st resin sheet member previously conveyed to a process area | region and the following 2nd resin sheet member among two or more strip-shaped resin sheet members, and produces a sheet joined body,
1st process of holding the front-end | tip part of a said 2nd resin sheet member,
A second step of applying a light absorbing agent to the tip portion held in the first step;
By carrying out the accumulated said 1st resin sheet member to a downstream side, accumulating the said 1st resin sheet member carried in from an upstream side, through the sheet | seat accumulating part comprised so that the carrying-in speed | rate of a said 1st resin sheet member may differ. While conveying the said 1st sheet member to the said process area | region and conveying of the said 1st sheet member on the downstream side of the said sheet | seat accumulation part, the conveyance of the said 1st sheet member is stopped and upstream of the said 1st resin sheet A third step of holding the member,
A fourth step of cutting the first resin sheet member held in the third step so that the held part constitutes an end portion;
A fifth step of overlapping the tip end portion and the end portion with the light absorbing agent sandwiched therebetween;
A sixth step of bonding by performing laser welding while pressing the tip and end portions superimposed in the fifth step;
And a seventh step of releasing pressurization to the tip and end portions, and holding the tip and end portions, and conveying the second resin sheet member to the treatment region following the first resin sheet member. Method for producing a conjugate. The manufacturing method of the sheet joined body of Claim 1 which has an 8th process of collect | recovering the unnecessary part by winding up the unnecessary part produced | generated by the cutting | disconnection in the said 4th process in the said 1st resin sheet member. The said resin sheet member is a single | mono layer of a thermoplastic resin film, The manufacturing method of the sheet joined body of Claim 1 or 2 characterized by the above-mentioned. The said resin sheet member is a polyvinyl alcohol-type resin film for producing a polarizing film, The manufacturing method of the sheet joined body of Claim 1 or 2 characterized by the above-mentioned. It is a manufacturing apparatus of the sheet | seat joined body which joins the 1st resin sheet member previously conveyed to a process area | region, and the following 2nd resin sheet member among two or more strip-shaped resin sheet members, and produces a sheet joined body,
It is comprised so that the carrying-in speed | rate of a said 1st resin sheet member and a carrying-out speed may differ, by carrying out the accumulated said 1st resin sheet member to a downstream side, accumulating the said 1st resin sheet member carried in from an upstream, and On the upstream side, the sheet accumulator which enables the stop of conveyance of the said 1st resin sheet, continuing conveyance of the said 1st resin sheet to the said process area | region,
A first holding portion disposed upstream from the sheet accumulating portion and holding the first resin sheet member in accordance with a conveyance stop of the first resin sheet member;
A cutting portion for cutting the first resin sheet member such that a portion held by the first holding portion constitutes an end portion;
A second holding part for holding a tip of the second resin sheet member;
An applicator for applying a light absorbent to a distal end held by the second holding part;
An arrangement adjusting unit for adjusting the distal end portion and the distal end portion so that the distal end portion and the distal end sandwich the light absorbing agent and overlap each other;
A pressing portion for pressing the overlapping portions of the tip and distal ends;
A laser beam irradiation unit for irradiating a laser beam to the overlapping portion pressed by the pressing unit, and bonding the distal end portion and the distal end portion by laser welding;
It is comprised so that the said 2nd resin sheet member may be conveyed to the said process area | region following the said 1st resin sheet member by releasing pressurization to the front-end | tip part and terminal part by the said press part, and holding | maintenance of the said front-end part and terminal part. The manufacturing apparatus of the sheet joined body made into. The said 1st resin sheet member is attached to the sending part which can wind the said 1st resin sheet member, The said sending part is unnecessary which was produced | generated by the cutting | disconnection by the said cutting part in the said 1st resin sheet member. It is comprised so that the said unnecessary part may be collect | recovered by winding a part, The manufacturing apparatus of the sheet joined body characterized by the above-mentioned. The said resin sheet member is a single | mono layer of a thermoplastic resin film, The manufacturing apparatus of the sheet joined body of Claim 5 or 6 characterized by the above-mentioned. The said resin sheet member is a polyvinyl alcohol-type resin film for producing a polarizing film, The manufacturing apparatus of the sheet joined body of Claim 5 or 6 characterized by the above-mentioned.

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