JP4668847B2 - Manufacturing method of laminate film excellent in antistatic property and manufacturing method of bag body excellent in antistatic property - Google Patents

Description

  The present invention relates to a method for producing a laminate film and a bag that are sufficiently neutralized and that are not easily charged even after a lapse of time.

  In this specification and claims, the term “film” is used to include films and sheets.

  Packaging materials and packaging bags for packaging electronic materials such as silicon wafers, compound semiconductor wafers, and hard disks are required to be uncharged in order to prevent electrical adverse effects on the electronic materials. In addition, if the packaging material for packaging food, pharmaceuticals, etc. is charged, dust or dust may adhere to it, which may cause line troubles during production, which will reduce production efficiency. Also, if dust or dust adheres, the cleanliness as a packaging material is deteriorated, so that it is required not to be charged. Thus, packaging materials and packaging bags for packaging electronic materials, foods, pharmaceuticals, and the like are strongly required to have excellent antistatic properties.

Conventionally, as a packaging film having excellent antistatic properties, those obtained by kneading an antistatic agent are known (see Patent Documents 1 and 2). That is, Patent Document 1 describes a laminate film obtained by laminating a base material layer on a polyolefin-based film containing an antistatic agent, and Patent Document 2 describes a base material layer imparted with antistatic properties, A packaging film comprising a metal barrier foil layer laminated on a base material layer and a polyolefin layer containing an antistatic agent laminated on the metal barrier foil layer is described.
JP 2004-339398 A JP 2005-28808 A

  However, in the films described in Patent Documents 1 and 2, since the antistatic agent is kneaded, it is inevitable that the antistatic agent bleeds out to the surface with the passage of time. There was a problem to do. In addition, in order to obtain a sufficient antistatic effect, the amount of the antistatic agent must be increased, which increases the cost. Further, since an antistatic agent is added and mixed, there is a problem that workability is reduced accordingly.

  The present invention has been made in view of such technical background, has good cleanliness, is sufficiently neutralized, has excellent antistatic durability, and is charged over time. It is an object of the present invention to provide a method for producing difficult laminate films and bags efficiently and at low cost.

  In order to achieve the above object, the present invention provides the following means.

[1] a first static elimination treatment step of performing static elimination treatment on a superposed surface of at least two films before superposition using a static elimination device;
A laminating step in which the films subjected to the first static elimination treatment step are overlapped to obtain a laminated integrated film;
A method for producing a laminate film excellent in antistatic properties, comprising: a second static elimination treatment step of performing static elimination treatment on both outer surfaces of the laminated integrated film using a static elimination device.

  [2] The method for producing a laminate film having excellent antistatic properties according to item 1 above, wherein the charge removal treatment in the first charge removal treatment step and the charge removal treatment in the second charge removal treatment step are performed using an ion supply type charge removal device.

  [3] The method for producing a laminate film having excellent antistatic properties according to the above item 1 or 2, wherein the films subjected to the first static elimination treatment step are overlapped with each other through an adhesive to obtain a laminated integrated film.

[4] a first static elimination treatment step of performing static elimination treatment on a superposed surface of at least two films before superposition using a static elimination device;
A sealing step of obtaining a bag body by laminating the films that have undergone the first static elimination treatment step and sealingly joining at least a part of the peripheral edge thereof;
A method of manufacturing a bag body excellent in antistatic property, comprising: a second static elimination treatment step of performing a static elimination treatment on an outer surface of the sealed bag body using a static elimination device.

  [5] The method for producing a bag body having excellent antistatic properties according to the item 4, wherein the charge removal process in the first charge removal process and the charge removal process in the second charge removal process are performed using an ion supply type charge removal device.

[6] A first static elimination treatment step of carrying out static elimination treatment using a static elimination device on the overlapping surface of at least two films before superposition;
A laminating step in which the films subjected to the first static elimination treatment step are overlapped to obtain a laminated integrated film;
A second charge removal treatment step of obtaining a laminate film by performing charge removal treatment on both outer surfaces of the laminated integrated film using a charge removal device;
A third static elimination treatment step of performing static elimination treatment using a static elimination device on the overlapping surface of at least two laminate films before superimposition;
A sealing step of obtaining a bag body by laminating the laminated films that have undergone the third static elimination treatment step and sealingly joining at least a part of the peripheral edge thereof;
A method of manufacturing a bag body having excellent antistatic properties, comprising: a fourth static elimination treatment step of performing a static elimination treatment on the outer surface of the sealed bag body using a static elimination device.

  [7] The method for producing a bag body having excellent antistatic properties according to the above item 6, wherein the charge removal process of the first to fourth charge removal process steps is performed using an ion supply type charge removal apparatus.

  In the invention of [1], the static elimination process is performed on the superposed surface of the film before superposition using the static elimination device, and the static elimination process is performed on both outer surfaces of the laminated and integrated films. Therefore, the obtained laminate film is sufficiently neutralized, has excellent antistatic durability, and does not easily charge even after a lapse of time. That is, in the production of the laminate film, it is possible to carry out sufficiently effective and durable static elimination. Moreover, since the antistatic agent is not kneaded and the charge is not eliminated, the cleanliness is good and the production efficiency is good and the production can be performed at low cost.

  In the invention of [2], since the static elimination treatment is performed using the ion supply type static eliminator, the static elimination can be performed more sufficiently and the sustainability of the antistatic property can be further improved.

  In the invention of [3], the films are laminated and integrated with each other through an adhesive, but even when these films are bonded together, the charge can be sufficiently eliminated without any problem.

  In the invention of [4], the static elimination process is performed on the superposed surface of the film before superimposition using the static eliminator, and the static elimination process is performed on the outer surface of the sealed bag body. Therefore, the obtained bag body is sufficiently neutralized, has excellent antistatic durability, and does not easily charge even after a lapse of time. That is, in the production of the bag body, it is possible to carry out sufficiently effective and durable static elimination. Moreover, since the antistatic agent is not kneaded and the charge is not eliminated, the cleanliness is good and the production efficiency is good and the production can be performed at low cost.

  In the invention of [5], since the neutralization treatment is performed using the ion supply type neutralization device, the neutralization can be performed more sufficiently, and the sustainability of the antistatic property can be further improved.

  In the invention of [6], the static elimination process is performed on the superposed surface of the film before superposition using the static elimination device, and the static elimination process is performed on both outer surfaces of the laminated and integrated films. In addition, the static electricity removal process is performed on the superposed surface of the laminate film before superimposing using the static elimination device, and the static electricity removal process is performed on the outer surface of the sealed bag body using the static elimination device. The obtained bag body is sufficiently neutralized, has excellent antistatic durability, and is difficult to be charged with time. That is, in the production of the bag body, it is possible to carry out sufficiently effective and durable static elimination. Moreover, since the antistatic agent is not kneaded and the charge is not eliminated, the cleanliness is good, the production efficiency is good, and the bag can be produced at low cost.

  In the invention of [7], since the static elimination treatment is performed using the ion supply type static eliminator, the static elimination can be performed more sufficiently, and the sustainability of the antistatic property can be further improved.

  A method for producing a laminate film (1) having excellent antistatic properties according to the present invention will be described.

  First, as shown in FIG. 1, a static elimination process is performed on the superposed surfaces of the films (2) and (3) before superimposition (before lamination) using a static eliminator (21) (22) (first). Static elimination process). That is, the static elimination process is performed on the superposed surface of one film (2) using the static eliminator (21), and the static eliminator (22) is also applied to the superposed surface of the other film (3). To remove static electricity.

  Thereafter, the films (2) and (3) that have passed through the first static elimination treatment step are immediately stacked and integrated to obtain a laminated integrated film (4) (lamination step). For example, as shown in FIG. 1, a laminated integrated film (4) by heating and pressurizing the films (2) and (3) that have undergone the first static elimination treatment step between a pair of heating and pressing rolls (11) and (12). ) Alternatively, after an adhesive is applied to one or both of the overlapping surfaces of the films (2) and (3) that have undergone the first static elimination treatment step, the films (2) and (3) are overlapped, and a pair of heating processes are performed. The films (2) and (3) are inserted between the pressure rolls (11) and (12), and the films (2) and (3) are heated and pressed to be integrated with each other to obtain a laminated integrated film (4). Alternatively, a synthetic resin extruded film (adhesive layer) extruded from an extruder is disposed between the films (2) and (3) that have undergone the first static elimination treatment step, and these are paired with a pair of heat and pressure rolls (11). (12) The laminated integrated film (4) is obtained by inserting between and heating and pressing the films (2) and (3).

  The adhesive is not particularly limited, and examples thereof include polyester adhesives, ether adhesives, acrylic adhesives, urethane adhesives, and the like. Moreover, as a synthetic resin extrusion film for adhesion | attachment, a polyester-type film, an ether-type film, an acrylic film, a polyethylene-type film etc. are mentioned.

  Next, a static elimination process is performed on both outer surfaces (upper and lower sides in FIG. 1) of the laminated integrated film (4) using a static eliminator (23) (24) (second static elimination process). That is, a static elimination process is performed on one outer surface of the laminated integrated film (4) by using a static eliminator (23), and a static eliminator (24) is applied to the other outer surface of the laminated integrated film (4). ) To perform static elimination processing. The laminate film (1) thus produced is wound up, for example, on a winding roll (13).

  According to the manufacturing method of the laminated film (1) of the present invention, while performing the static elimination process using the static eliminators (21) and (22) on the superposed surfaces of the films (2) and (3) before superposition, Since static elimination processing is performed on both outer surfaces of the laminated and integrated film (4) using the static eliminators (23) and (24), the obtained laminate film (1) is sufficiently neutralized, It has excellent antistatic durability and hardly charges over time. That is, in the production of the laminate film (1), it is possible to carry out static elimination that is sufficiently effective and long-lasting. Moreover, since the antistatic agent is not kneaded and the charge is not eliminated, the cleanliness is good and the production efficiency is good and the production can be performed at low cost. The reason why sufficient neutralization can be achieved by the production method of the present invention is not clear, but static electricity is accumulated at the lamination interface between films by laminating with the static eliminator on the superposed surface of the film. It is presumed that there is an effect by being able to sufficiently suppress this. In addition, when the 2nd static elimination process process which performs static elimination of an outer surface is abbreviate | omitted, when laminating | stacking laminate films and arrange | positioning them, such as winding up the laminated film on a roll, it carries static electricity on the surface of a laminate film. As a result, sufficient static elimination cannot be performed.

  Although it does not specifically limit as said static elimination apparatus (21) (22) (23) (24), An ion supply type static elimination apparatus, a roller-type static elimination apparatus, a static elimination brush apparatus, a static elimination cloth apparatus etc. are mentioned. Among these, it is preferable to use an ion supply type static eliminator. The ion supply type static eliminator is not particularly limited, and examples thereof include a corona discharge type static eliminator, a soft X-ray type static eliminator, and a static eliminator equipped with a static elimination electrode that generates ions by voltage application. .

  Next, the manufacturing method of the bag (31) excellent in antistatic properties according to the present invention will be described. First, as shown in FIG. 2, a static elimination process is performed on the overlapping surfaces of the films (2) and (3) before superposition using the static eliminators (41) and (42) (first static elimination process). . That is, the static elimination device (41) is used for the superposed surface of one film (2), and the static eliminator (42) is also used for the superposed surface of the other film (3). To remove static electricity. As said one film (2), a single layer film may be used, or the laminate film (1) manufactured by the said manufacturing method may be used. Moreover, as said other film (3), a single layer film may be used, or the laminate film (1) manufactured by the said manufacturing method may be used.

  Thereafter, the films (2) and (3) that have undergone the first static elimination treatment step are immediately overlapped and at least a part of the peripheral edge thereof is sealed and joined to obtain a bag body (31) (sealing step). For example, as shown in FIG. 2, a part of the peripheral part of the films (2) and (3) (three peripheral parts of the four peripheral parts) is heated and pressurized using a heat seal device (45). Thus, the bag body (31) is obtained by sealing and joining.

  A static elimination process is performed on both outer surfaces (upper and lower sides in FIG. 2) of the sealed bag body (31) using the static eliminators (43) and (44) (second neutralization process step). That is, a static elimination process is performed on one outer surface of the seal-bonded bag body (31) using a static eliminator (43), and a static eliminator (44) is applied to the other outer surface of the bag body (31). ) To perform static elimination processing. Next, the bag body (31) is obtained by cutting into a predetermined size using the cutting machine (46).

  According to the manufacturing method of the bag (31) of this invention, while performing the static elimination process using the static eliminator (41) (42) with respect to the overlapping surface of the film (2) (3) before superimposition, Since the outer surface of the sealed bag body (31) is subjected to charge removal processing using the charge removal devices (43) and (44), the obtained bag body (31) is sufficiently discharged and charged. It has excellent preventive durability and is difficult to be charged with time. That is, when producing the bag body (31), it is possible to perform static elimination that is sufficiently effective and has long-lasting durability. Moreover, since the antistatic agent is not kneaded and the charge is not eliminated, the cleanliness is good and the production efficiency is good and the production can be performed at low cost. The reason why sufficient neutralization can be achieved by the production method of the present invention is not clear, but by removing the static electricity with the static eliminator on the overlapping surface of the film, static electricity is generated at the laminated interface between the films when they are overlapped at the time of seal bonding. It is presumed that there is an effect by being able to sufficiently suppress the accumulation of.

  Although it does not specifically limit as said static elimination apparatus (41) (42) (43) (44), An ion supply type static elimination apparatus, a roller-type static elimination apparatus, a static elimination brush apparatus, a static elimination cloth apparatus etc. are mentioned. Among these, it is preferable to use an ion supply type static eliminator. The ion supply type static eliminator is not particularly limited, and examples thereof include a corona discharge type static eliminator and a static eliminator equipped with a static elimination electrode that generates ions by voltage application.

Although it does not specifically limit as said film (2) (3), For example, a synthetic resin film, aluminum foil, etc. are mentioned. The synthetic resin film is not particularly limited, for example,
1) Biaxially stretched polyethylene terephthalate (PET) film with aluminum foil attached, Biaxially stretched polypropylene (PP) film 2) Biaxially stretched PET film with metal aluminum deposited, Biaxially stretched PP film 3) Silicon oxide Biaxially stretched PET film, biaxially stretched PP film, biaxially stretched polyamide film 4) Biaxially stretched PET film coated with polyvinylidene chloride or polyvinyl alcohol, Biaxially stretched PP film 5) Ethylene -Vinyl acetate copolymer saponified film 6) Polyvinyl alcohol film 7) Polycarbonate film 8) Polypropylene film 9) Polyethylene terephthalate film 10) Polyamide (nylon-6, nylon-6, 6, etc.)
11) A cellulose acetate film etc. are mentioned.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

< Reference Example 1>
Before superimposing a 12 μm thick polyethylene terephthalate film, a 15 μm thick biaxially stretched nylon film, and a 50 μm thick low density polyethylene film in this order, an ion-fed neutralizing device (voltage) Immediately after performing the first static elimination treatment using the application type), an adhesive (main agent: polyester-based adhesive, curing agent: polyisocyanate-based adhesive) is 3.0 g / m between these three types of films. ² (Since the total of two adhesive layers is 6.0 g / m ² ), these three kinds of films are sandwiched between a pair of heat and pressure rolls (temperature 60 ° C.) and pressed to form a laminated integrated film. Then, by performing a second static elimination treatment using an ion supply static eliminator (voltage application type) on both outer surfaces of the laminated integrated film, It was produced Mi titanate film.

<Comparative Example 1>
A laminate film was produced in the same manner as in Reference Example 1 except that the first charge removal process and the second charge removal process were omitted.

<Comparative Example 2>
A laminate film was produced in the same manner as in Reference Example 1 except that the second charge removal treatment was omitted.

<Comparative Example 3>
A laminate film was produced in the same manner as in Reference Example 1 except that the first charge removal treatment was omitted.

<Example 1 >
Before superimposing a 12 μm thick polyethylene terephthalate film, a 15 μm thick biaxially stretched nylon film, and a 50 μm thick low density polyethylene film in this order, an ion-fed neutralizing device (voltage) Immediately after performing the first static elimination treatment using the application type), an adhesive (main agent: polyester-based adhesive, curing agent: polyisocyanate-based adhesive) is 3.0 g / m between these three types of films. ² (Since the total of two adhesive layers is 6.0 g / m ² ), these three kinds of films are sandwiched between a pair of heat and pressure rolls (temperature 60 ° C.) and pressed to form a laminated integrated film. Then, by performing a second static elimination treatment using an ion supply static eliminator (voltage application type) on both outer surfaces of the laminated integrated film, It was produced Mi titanate film.

  Next, before superimposing the two manufactured laminate films, a third charge removal process is performed on the overlapping surface of each laminate film using an ion supply type charge removal device (voltage application type), and then the laminate is immediately laminated. The films are overlapped and a part of the peripheral part (the peripheral part of three of the four peripheral parts) is sealed and bonded with a heat seal device, and both the outer surfaces of the sealed bag body are bonded. A bag body for electronic material product packaging was manufactured by performing a fourth charge removal process using an ion supply type charge removal apparatus (voltage application type).

< Reference Example 2 >
An electronic material product packaging bag was manufactured in the same manner as in Example 1 except that the third charge removal process and the fourth charge removal process were omitted.

< Reference Example 3 >
An electronic material product packaging bag was produced in the same manner as in Example 1 except that the first charge removal process and the second charge removal process were omitted.

<Comparative example 4>
An electronic material product packaging bag was manufactured in the same manner as in Example 1 except that the second charge removal process, the third charge removal process, and the fourth charge removal process were omitted.

<Comparative Example 5>
An electronic material product packaging bag was produced in the same manner as in Example 1 except that the first charge removal process, the third charge removal process, and the fourth charge removal process were omitted.

<Comparative Example 6>
An electronic material product packaging bag was produced in the same manner as in Example 1 except that the first charge removal process, the second charge removal process, and the fourth charge removal process were omitted.

<Comparative Example 7>
An electronic material product packaging bag was produced in the same manner as in Example 1 except that the first charge removal process, the second charge removal process, and the third charge removal process were omitted.

<Comparative Example 8>
An electronic material product packaging bag was produced in the same manner as in Example 1 except that the first charge removal process and the third charge removal process were omitted.

  The static elimination effect was evaluated based on the following evaluation method for each laminate film and each bag produced as described above. These results are shown in Tables 1 and 2.

<Evaluation method for static elimination effect (evaluation method for antistatic performance)>
(Evaluation of static elimination effect of laminate film)
As shown in FIG. 3 (a), 50 manufactured laminate films (1) were stacked in order in the vertical direction, left in this stacked state for 10 minutes, and then sucker body ( 50), the laminate film (1) is sequentially taken out one by one by being conveyed in the horizontal direction in a state where one side of the laminate film (1) is pulled up. At this time, if the laminate film is successfully removed with one sheet, it is judged as “Pass”, and when the laminate film is removed, the underlying laminate film is also attached and removed. The case where the lower laminate film was displaced by dragging together was defined as “occurrence of defects due to adsorption”, and the static elimination effect was evaluated in the following three stages based on the occurrence rate of the adsorption defects. While evaluating the static elimination effect about the laminate film immediately after manufacture, the sustainability of the static elimination effect was evaluated about the laminate film which passed 24 hours after manufacture.

(Evaluation of static elimination effect of bag)
As shown in FIG. 3 (a), 50 manufactured bag bodies (31) are stacked in order in the vertical direction, and left in this stacked state for 10 minutes, and then sucker bodies ( 50), the bags are sequentially taken out one by one by being transported in the horizontal direction in a state where one side of the bag is pulled up. At this time, if a single bag is successfully removed, the result is “Pass”, and when the bag is removed, the lower bag is also attached and removed. A case in which the position of the lower bag body was shifted by dragging together was defined as “defects due to adsorption”, and the neutralization effect was evaluated in the following three stages based on the occurrence rate of these adsorption defects. While evaluating the static elimination effect about the bag body immediately after manufacture, the sustainability of the static elimination effect was evaluated about the bag body which passed 24 hours after manufacture.

(Criteria)
“◎”: The occurrence rate of adsorption failure is less than 3% “O”: The occurrence rate of adsorption failure is 3% or more and 5% or less “×”: The occurrence rate of adsorption failure exceeds 6% “-” ... As the evaluation was x immediately after the production, the sustainability was not evaluated.

As is clear from the table, the laminate film of Reference Example 1 produced by the production method of the present invention is sufficiently neutralized and has excellent antistatic long-term durability and is charged even after time. It was difficult.

  On the other hand, the laminate films of Comparative Example 1 and Comparative Example 2 were insufficient in the charge removal effect from the initial stage immediately after production. Further, the laminate film of Comparative Example 3 was inferior in the long-term sustainability of the antistatic property although the initial charge removal was sufficient.

In addition, the bags of Example 1 and Reference Examples 2 and 3 manufactured by the manufacturing method of the present invention are sufficiently neutralized and have excellent long-term antistatic properties, even if time passes. It was difficult to be charged.

  On the other hand, the bag bodies of Comparative Examples 4 to 6 were insufficient in the charge removal effect from the initial stage immediately after production. Further, the bags of Comparative Examples 7 and 8 were inferior in the long-term sustainability of the antistatic property, although the initial charge removal was sufficient.

  According to the method for producing a laminate film according to the present invention, a laminate film that is sufficiently neutralized and hardly charged even after a lapse of time can be produced. Therefore, the laminate film is suitable as a packaging material for electronic material products, for example. Used for.

  Further, according to the bag body manufacturing method of the present invention, a bag body that is sufficiently neutralized and hardly charged even after a lapse of time can be manufactured. It is suitably used as a bag body.

It is a schematic explanatory drawing of the manufacturing method of the laminate film which concerns on this invention. It is a schematic explanatory drawing of the manufacturing method of the bag concerning this invention. It is explanatory drawing of the evaluation method of a static elimination effect, (a) is the state which piled up the produced bag (or laminate film) in order up and down, (b) is one side of a bag (or laminate film) using a sucker Each of the figures shows a state where the sheet is conveyed and taken out in the horizontal direction with the side raised.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Laminate film 2 ... Film 3 ... Film 4 ... Laminated integrated film 21-24 ... Static elimination apparatus 31 ... Bag body 41-44 ... Static elimination apparatus 45 ... Heat seal apparatus

Claims (2)

A first static elimination treatment step of performing static elimination treatment using a static elimination device on the overlapping surface of at least two films before superposition;
A laminating step in which the films subjected to the first static elimination treatment step are overlapped to obtain a laminated integrated film;
A second charge removal treatment step of obtaining a laminate film by performing charge removal treatment on both outer surfaces of the laminated integrated film using a charge removal device;
A third static elimination treatment step of performing static elimination treatment using a static elimination device on the overlapping surface of at least two laminate films before superimposition;
A sealing step of obtaining a bag body by laminating the laminated films that have undergone the third static elimination treatment step and sealingly joining at least a part of the peripheral edge thereof;
A method of manufacturing a bag body having excellent antistatic properties, comprising: a fourth static elimination treatment step of performing a static elimination treatment on the outer surface of the sealed bag body using a static elimination device. Method for producing antistatic excellent in bag body according to claim 1 for charge elimination of the first to fourth charge elimination step with an ion-fed neutralizer.

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