JP2010058291A - Method for opening cylindrical film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for opening a cylindrical film which can easily open the cylindrical film without causing the problems of the occurrence of a suction trace in the cylindrical film made of a thermoplastic resin or a thermoplastic elastomer composition and the hanging-down of the end of the film. <P>SOLUTION: In the method for opening the cylindrical film 1, at least one end 1 m of the cylindrical film 1 folded in the shape of a plane which is made of the thermoplastic resin or the thermoplastic elastomer composition is opened. By making an adhesive member 2 contact a plurality of spots in the periphery of the peripheral surface of at least one end 1 m of the cylindrical film 1 folded in the shape of a plane, the one end 1 m is held by its adhesion. Next, the adhesive member 2 with its one end 1 m held is moved to open the one end 1 m of the cylindrical film 1 cylindrically. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for opening a tubular film comprising a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin.

  In general, a tubular film made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin is produced by inflation molding. In this inflation molding, air is supplied from the inside of a cylindrical film extruded through a cylindrical die from an extruder, and then blown, then deformed into a flat shape by a guide means, and then flattened by a pair of pinch rolls. It is folded and wound around the core of the winder in a roll shape (for example, see Patent Document 1). Thus, it is necessary to open the cylindrical film folded in a planar shape and return it to the cylindrical shape at the time of use.

  Conventionally, there is a method of using a suction cup as a method of opening a cylindrical film folded in a flat shape and returning it to a cylindrical shape (see, for example, Patent Document 2). By sucking the outer peripheral surface with a suction cup, the cylindrical film folded into a flat shape is opened and returned to a cylindrical shape.

However, when a thin film is adsorbed by an adsorbing cup, an adsorbing mark remains on the film, which causes a problem of becoming wrinkles when pasted to other members. Moreover, since it is necessary to adsorb | suck a suction cup in the position away from the edge of the film to some extent, the open edge part hangs down and there exists a possibility of causing a trouble.
JP 2005-125499 A JP 2001-219478 A

  An object of the present invention is to provide a tubular film that can be easily opened without causing problems of generation of adsorption marks or sagging of an end of a tubular film made of a thermoplastic resin or a thermoplastic elastomer composition. It is in providing the opening method of a film-like film.

  The opening method of the tubular film of the present invention that achieves the above object is composed of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin, and at least one end of a tubular film folded in a plane. A cylindrical film opening method for opening a cylindrical film, wherein an adhesive member is brought into contact with at least a plurality of locations on the outer peripheral surface of at least one end portion of the cylindrical film folded into a flat shape, and the one end portion is formed by the adhesive force. The adhesive member that holds the one end is moved in a direction in which one end of the cylindrical film is opened in a cylindrical shape, and the one end is opened in a cylindrical shape.

  According to the present invention described above, the cylindrical film is held using the adhesive force of the adhesive member, and the adhesive member is moved to open the cylindrical film. The cylindrical film can be easily opened without leaving any traces. Moreover, since the edge part of a cylindrical film can be hold | maintained, the problem of drooping of an edge part does not arise.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an embodiment of the method for opening a tubular film of the present invention, wherein 1 is a tubular film folded in a flat shape, and 2 is an adhesive member for holding the tubular film 1. The tubular film 1 is composed of a thermoplastic elastomer or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin.

  In the embodiment of FIG. 1, first, a long tubular film 3 folded into a flat shape wound up in a roll shape is unwound and cut into a predetermined length by a cutter 4 so as to have a fixed tubular shape. Film 1 is formed. Next, a plurality of locations on the outer peripheral surface of one end (conveyance direction front end) 1m of the regular cylindrical film 1 folded into a flat shape (for example, five locations on the upper side and five locations on the lower side as shown in FIG. 2) The adhesive member 2 is brought into contact with a total of 10 places), and the one end 1m is held by the adhesive force. Subsequently, the upper adhesive member 2 holding the one end portion 1m and the lower adhesive member 2 are moved in the vertical direction in which the one end portion 1m opens in a cylindrical shape as indicated by an arrow. FIG. 3 shows a preferred example in which the adhesive members 2 holding one end 1m are moved so as to form an annular shape when opened, and the one end 1m is opened in a cylindrical shape.

  The tubular film 1 having the one end 1m thus opened is then conveyed to the step of opening the entire tubular film 1 while being held by the adhesive member 2. In the opening step, a conical opening jig 5 is inserted into the tubular film 1 from the opened one end 1m side, and the entire tubular film 1 is opened in a tubular shape. The tubular film 1 opened in a tubular shape as a whole is subsequently attached to a forming drum 6 disposed adjacent to the opening jig 5.

  After attachment, the adhesive member 2 is separated from the tubular film 1. As a method of separating, the tack force of the adhesive is adjusted so that the adhesive member 2 is peeled off when the adhesive member 2 is displaced, or the adhesive member 2 is separated while the tubular film 1 is pressed by a pressing jig. it can.

  Preferred examples of the pressure-sensitive adhesive member 2 include a pressure-sensitive adhesive tape having a pressure-sensitive adhesive on one surface or a pressure-sensitive adhesive sheet impregnated with a pressure-sensitive adhesive. In the case of the pressure-sensitive adhesive tape, for example, as shown in FIG. 4, the long pressure-sensitive adhesive tape 8 wound around the accommodation roll 7 is wound around the winding roll 10 via a pair of rotatable rollers 9. Then, the portion 8x between the pair of rollers 9 is brought into contact with the outer peripheral surface of the one end 1m of the tubular film 1, and the next time the long adhesive tape 8 is conveyed by a predetermined amount, and the unused portion is the pair of rollers 9 A thing which moves in between can be illustrated preferably.

  In the case of an adhesive sheet impregnated with an adhesive, as shown in FIG. 5, an endless sheet 13 made of an endless fabric is wound between the driving roller 11 and the driven roller 12, and the endless sheet 13 is wound. The adhesive supplied from the adhesive tank 14 via the pump 15 is applied to the endless sheet 13 by the application head 16, and one portion 13x between the rollers 11 and 12 is placed on the outer peripheral surface of the one end 1m of the tubular film 1. Next, the endless sheet 13 is moved halfway and brought into contact with the other portion 13y can be preferably exemplified next time.

  In order to move the adhesive member 2 as shown in FIGS. 2 to 3, for example, as shown in FIG. 6, a plurality of adhesive portions 17 having the adhesive member 2 are connected via a link mechanism 18 and a gear mechanism (not shown). An example is one in which the connected upper and lower connecting bodies 19 are moved by the upper and lower cylinders 20. In the state where the rod 20x of the cylinder 20 is extended, as shown in FIG. 6A, the connecting body 19 is in a state where the adhesive portions 17 are arranged in a horizontal row, and the rod 20x of the cylinder 20 is contracted. As shown in FIG. 6B, the connecting body 19 is in a state where the adhesive portions 17 are arranged in a semicircular shape. The upper and lower cylinders 20 are connected and supported by the same moving body (not shown) and are movable together.

  The tubular film 1 cut by the cutter 4 is placed on the conveyor belt 21m of the belt conveyor 21, and the adhesive member 2 is attached to one end 1m of the tubular film 1 that protrudes to the front side of the belt conveyor 21. As shown in FIG. 7, a comb blade-like mounting table 22 on which one end 1m of the protruding tubular film 1 is placed is disposed on the front side of the belt conveyor 21. The comb blade portion The lower adhesive member 2 can be brought into contact with the lower side of one end 1m of the tubular film 1 using the space 23 between 22n. When the adhesive member 2 of the upper and lower adhesive portions 17 comes into contact with the upper and lower surfaces (outer peripheral surfaces) of the one end portion 1m of the tubular film 1 folded in a flat shape and holds the one end portion 1m by the adhesive force, the cylinder 20 is supported. A moving body (not shown) moves forward toward the transport front side and moves the adhesive portion 17 forward from the mounting table 22. In this state, the rod 20x of the cylinder 20 is contracted, and as shown in FIG. 6B, the connecting body 19 places the adhesive portions 17 in a semicircular shape.

  The pressure-sensitive adhesive of the pressure-sensitive adhesive member 2 is any conventionally known pressure-sensitive adhesive as long as it can hold the tubular film 1 with adhesive force and does not cause a problem with the tubular film 1. For example, an acrylic adhesive can be mentioned preferably.

  According to the present invention described above, the tubular film 1 is held by utilizing the adhesive force of the adhesive member 2 and is opened by the movement of the adhesive member 2. The cylindrical film 1 can be easily opened without remaining. And since the edge part 1m of the cylindrical film 1 can be hold | maintained, it does not cause the problem of a drooping of an edge part.

  FIG. 8 shows another embodiment of the method for opening a tubular film of the present invention, and the outer peripheral surfaces of both end portions 1m, 1n and the intermediate portion 1p between both end portions 1m, 1n of the tubular film 1 folded into a flat shape. The adhesive member 2 is brought into contact with a plurality of locations on the outer peripheral surface of the outer peripheral surface, and both ends 1m, 1n and the intermediate portion 1p are held by the adhesive force to open the entire cylindrical film 1 in a cylindrical shape. It is.

  In this opening method, first, as shown in FIG. 8 (a), the adhesive members 2 are respectively placed at a plurality of positions on the outer peripheral surfaces of the both end portions 1m, 1n and the intermediate portion 1p of the tubular film 1 folded into a flat shape. Make contact. In the figure, an example is shown in which the adhesive members 2 are brought into contact in two rows in the intermediate portion 1p.

  In order to contact the adhesive member 2 in this way, first, the adhesive member 2 is brought into contact with the end 1 m on the mounting table 22 in the same manner as described above. Next, the cylindrical film 1 is conveyed by a predetermined amount, the front part of the intermediate part 1p is positioned on the mounting table 22, and another adhesive member 2 is brought into contact in the same manner as described above. Subsequently, the tubular film 1 is further conveyed by a predetermined amount, the rear part of the intermediate part 1p is positioned on the mounting table 22, and another adhesive member 2 is brought into contact in the same manner as described above. Then, the tubular film 1 is further conveyed by a predetermined amount, the other end 1n is positioned on the mounting table 22, and another adhesive member 2 is brought into contact in the same manner as described above.

  When the adhesive member 2 is brought into contact with the other end 1 n and the outer peripheral surface of the tubular film 1 is held by the adhesive member 2, the tubular film 1 is transported to a position where the other end 1 n is detached from the mounting table 22. Therefore, as shown in FIG. 8 (b), the adhesive member 2 holding the both end portions 1m and 1n is moved up and down (in the direction in which both end portions of the tubular film 1 are opened in a cylindrical shape), and the both end portions are moved. 1m and 1n are opened in a cylindrical shape. Subsequently, as shown in FIG. 8 (c), the adhesive member 2 holding the intermediate portion 1p is moved up and down (in the direction in which the intermediate portion of the tubular film 1 is opened in a cylindrical shape), so that the intermediate portion 1p is moved into the cylinder. Open in a shape. As a result, the entire tubular film 1 folded in a planar shape is opened in a tubular shape.

  With the opening method shown in FIG. 8, the entire tubular film 1 can be easily opened without causing problems of generation of suction marks and sagging of the end portions. Opening the intermediate portion 1p before opening both end portions 1m and 1n is not preferable because the intermediate portion 1p is difficult to open and the film is likely to be deformed.

  In the said embodiment, although the example which opens the cylindrical film 1 of the fixed length which cut | disconnected the long cylindrical film 3 folded planarly to predetermined length was shown in cylinder shape, this invention is planar. When one end of the folded long tubular film 3 is opened and then cut, it can be preferably used also when one end of the long tubular film 3 is opened in a cylindrical shape. The present invention can be applied to any case in which at least one end of a cylindrical film folded into a cylindrical shape is opened in a cylindrical shape.

  In the present invention, when the tubular film 1 is used as a tire constituent member such as an inner liner layer which is an air permeation preventive layer of a pneumatic tire, a thermoplastic resin or a thermoplastic elastomer composition constituting the tubular film 1 is used. The storage elastic modulus of the object is preferably in the range of 25 to 500 MPa, and the thickness of the tubular film 1 is preferably in the range of 0.01 to 3 mm.

  If the storage elastic modulus is lower than 25 MPa, the strength is insufficient. Conversely, if it exceeds 500 MPa, the toughness is lowered and the durability is deteriorated. When the thickness is less than 0.01 mm, the air permeation resistance decreases. If the thickness exceeds 3 mm, it is not preferable in terms of weight. The storage elastic modulus here is measured using a viscoelastic spectrometer (manufactured by Toyo Seiki Seisakusho) under the conditions of static strain 10%, dynamic strain ± 2%, frequency 20 Hz, and temperature 20 ° C.

  Examples of the thermoplastic resin used for the tubular film 1 include polyamide resins [for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12). , Nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6 / 66), nylon 6/66/610 copolymer (N6 / 66/610), nylon MXD6 (MXD6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer] and their N-alkoxyalkylated products, for example, methoxymethylated products of nylon 6, nylon 6/610 copolymerized Combined methoxymethylated product, nylon 612 methoxymethylated product, polyester resin [eg , Polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET / PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, polyoxyalkylene diimide di Aromatic polyester such as acid / polybutylene terephthalate copolymer], polynitrile resin [for example, polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), (meth) acrylonitrile / styrene copolymer Polymer, (meth) acrylonitrile / styrene / butadiene copolymer], polymethacrylate resin [eg, polymethyl methacrylate (PMMA), polyethyl methacrylate], polyvinyl resin [eg , Vinyl acetate, polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PDVC), polyvinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate copolymer Polymer, vinylidene chloride / acrylonitrile copolymer], cellulose resin [for example, cellulose acetate, cellulose acetate butyrate], fluorine resin [for example, polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorofluoroethylene (PCTFE), tetrafluoroethylene / ethylene copolymer], an imide resin [for example, aromatic polyimide (PI)] and the like can be preferably used.

  The thermoplastic elastomer composition can be constituted by mixing an elastomer component with the above-described thermoplastic resin component. Examples of the elastomer used include diene rubbers and hydrogenated products thereof [for example, natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene bradiene rubber (SBR), bradiene rubber (BR, high Cis BR and low cis BR), nitrile rubber (NBR), hydrogenated NBR, hydrogenated SBR], olefin rubber [eg, ethylene propylene rubber (EPDM, EPM), maleic acid modified ethylene propylene rubber (M-EPM), Butyl rubber (IIR), isobutylene and aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM), ionomer], halogen-containing rubber [for example, Br-IIR, CI-IIR, bromine of isobutylene paramethylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydride Rubber (CHR), chlorosulfonated polyethylene rubber (CSM), chlorinated polyethylene rubber (CM), maleic acid-modified chlorinated polyethylene rubber (M-CM)], silicone rubber [eg, methyl vinyl silicone rubber, dimethyl silicone rubber, Methyl phenyl vinyl silicon rubber], sulfur-containing rubber (for example, polysulfide rubber), fluorine rubber (for example, vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicon rubber, fluorine-containing phosphazene Rubbers], thermoplastic elastomers [for example, styrene elastomers, olefin elastomers, ester elastomers, urethane elastomers, polyamide elastomers] and the like can be preferably used.

  The composition ratio of the specific thermoplastic resin component (A) and the elastomer component (B) in the case of blending the thermoplastic resin and the elastomer is not particularly limited, and the film thickness, air permeation resistance, flexibility The weight ratio (A) / (B) is preferably 10/90 to 90/10, and more preferably 20/80 to 85/15.

  In the thermoplastic elastomer composition according to the present invention, in addition to the essential polymer component, another polymer such as a compatibilizer can be mixed as a third component. The purpose of mixing other polymers is to improve the compatibility between the thermoplastic resin and the elastomer component, to improve the molding processability of the material, to improve heat resistance, to reduce costs, etc. Examples of the material used include polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS, SBS, and polycarbonate (PC).

A method for producing a thermoplastic elastomer composition is a method in which a thermoplastic resin component and an elastomer component (unvulcanized product in the case of rubber) are previously melt-kneaded with a twin-screw kneading extruder or the like to form a continuous phase (matrix). By dispersing the elastomer component as a dispersed phase (domain) in the plastic resin. When vulcanizing the elastomer component, a vulcanizing agent may be added under kneading to dynamically vulcanize the elastomer component. Further, various compounding agents (excluding the vulcanizing agent) to the thermoplastic resin or the elastomer component may be added during the kneading, but are preferably mixed in advance before kneading. The kneading machine used for kneading the thermoplastic resin and the elastomer component is not particularly limited, and a screw extruder, a kneader, a Banbury mixer, a biaxial kneading extruder, or the like can be used. Among them, it is preferable to use a twin-screw kneading extruder for kneading the thermoplastic resin and the elastomer component and for dynamic vulcanization of the elastomer component. Further, two or more types of kneaders may be used and kneaded sequentially. As conditions for melt-kneading, the temperature may be equal to or higher than the temperature at which the thermoplastic resin melts. The shear rate during kneading is preferably 2500 to 7500 Sec- ¹ . The entire kneading time is from 30 seconds to 10 minutes, and when a vulcanizing agent is added, the vulcanization time after addition is preferably from 15 seconds to 5 minutes. The thermoplastic elastomer composition produced by the above method is formed into a film by molding with a resin extruder or calendering. The method for forming a film may be a method for forming a film of a normal thermoplastic resin or thermoplastic elastomer.

  The present invention can be preferably used to open a thin tubular film of 50 μm or less that is particularly susceptible to the problems described in the background art, but it is not limited thereto.

It is a perspective explanatory view showing one embodiment of the opening method of the cylindrical film of the present invention. It is explanatory drawing which shows the state which made the adhesive member contact the one end part of a cylindrical film. It is explanatory drawing which shows the example which made the cylindrical part open one end part of the cylindrical film with the adhesion member. It is explanatory drawing which shows the example whose adhesive member is an adhesive tape. It is explanatory drawing which shows the example in which an adhesive member is an adhesive sheet. (A) (b) is description which shows the structure to which the some adhesion part which has an adhesion member moves. (A) is a schematic side view of the mounting base which mounts the one end part of a cylindrical film arrange | positioned at the conveyance direction side of a belt conveyor, (b) is a top view of a mounting base. (A), (b), and (c) are cross-sectional explanations showing a step of opening the entire tubular film into a tubular shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical film 1m One end part 1n Other end part 1p Middle part 2 Adhesive member 3 Long cylindrical film 5 Opening jig 8 Adhesive tape 9 Endless sheet

Claims (8)

  A method of opening a cylindrical film comprising a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin, and opening at least one end of a cylindrical film folded into a flat shape into a cylindrical shape, An adhesive member is brought into contact with a plurality of locations on the outer peripheral surface of at least one end of the cylindrical film folded in a flat shape, the one end is held by the adhesive force, and the adhesive member holding the one end is attached to the cylindrical film. A method for opening a tubular film, wherein the one end is moved in a cylindrical opening direction and the one end is opened in a cylindrical shape.   The method for opening a tubular film according to claim 1, wherein the adhesive member holding the one end is moved so as to be arranged in an annular shape when opening.   The method for opening a cylindrical film according to claim 1 or 2, wherein the adhesive member is an adhesive tape having an adhesive on one surface or an adhesive sheet impregnated with an adhesive.   The method for opening a tubular film according to claim 1, 2 or 3, wherein the tubular film is a long tubular film folded in a plane.   The cylindrical film opening according to claim 1, 2 or 3, wherein the tubular film is formed by unwinding a long tubular film folded into a flat shape wound up in a roll and cutting it into a predetermined length. Method.   The cylindrical film according to any one of claims 1 to 5, wherein an opening jig is inserted into the cylindrical film from the opened one end side after opening one end of the cylindrical film in a cylindrical shape. Opening method.   An adhesive member is brought into contact with a plurality of locations on the outer peripheral surface of both ends of the cylindrical film folded in a flat shape and the outer peripheral surface of the intermediate portion between the both ends, and the both ends and the intermediate portion are held by the adhesive force. The cylindrical film opening according to claim 5, wherein after moving the pressure-sensitive adhesive member holding the cylindrical member, the whole cylindrical film folded in a flat shape is opened in a cylindrical shape by moving the pressure-sensitive adhesive member holding the intermediate portion. Method.   The storage elastic modulus of the thermoplastic resin or the thermoplastic elastomer composition constituting the tubular film is 25 to 500 MPa, and the thickness of the tubular film is 0.01 to 3 mm. The opening method of the cylindrical film of description.

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