JP2016097503A - Flexible liner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liner which suppresses occurrence of cracks.SOLUTION: A liner is a flexible liner used for winding a rubber material which is used as a tire raw material, and has a base cloth, an adhesive layer provided on both sides so as to sandwich the base cloth, and a film provided on the adhesive layer. The adhesive layer contains a thermoplastic polyester resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexible liner. Specifically, the present invention relates to a take-up liner for maintaining the tackiness of an unvulcanized rubber material used as a tire raw material.

  The liner is used when winding a belt-shaped rubber material, which is a tire material, in a wound shape. Specifically, since the belt-shaped unvulcanized rubber material is sticky, when the rubber material is wound into a wound shape by a winding mechanism, the wound belt-shaped rubber materials adhere to each other. End up. Therefore, a liner is used to prevent the rubber materials to be wound from adhering to each other. That is, the liner has a function of sticking the rubber material. On the other hand, when using the rubber material, the adhered rubber material is peeled from the liner. That is, the liner also has a function of peeling the rubber material.

Conventional liners are composed of a base fabric mainly composed of woven fabric. However, since the base fabric has air permeability, there is a problem that a so-called blooming phenomenon occurs when a rubber material as a tire raw material is wound, and the adhesive strength of the rubber material is lowered. In order to solve this problem, a liner is provided in which a PET film is bonded to a base fabric to ensure sealing performance. Thermosetting resins are widely used for bonding the base fabric and the PET film.

Patent Publication No. 4198267 Japanese Utility Model Publication No. 3-47848

  Here, when the base fabric constituting the liner and the PET film are bonded with a thermosetting resin, the present inventor uses the liner to “wind up” the rubber material in a wound shape and It was also found that when the rubber material was peeled from the liner, cracks occurred in the portion where the base fabric and the PET film were bonded due to the property that the thermosetting resin did not soften ( (See FIG. 3). If the crack is generated, when the rubber material is peeled off from the liner, there is a possibility that a fragment of the liner generated by the crack adheres to the rubber material. In addition, when a new rubber material is wound in a state where the crack is generated, a portion where the rubber material does not adhere to the liner is generated, which may prevent the rubber material from being stably held on the liner. That is, there is a possibility that the original function of the liner that prevents the wound rubber members from adhering to each other cannot be sufficiently exhibited. Moreover, when the said crack has arisen, there exists a possibility that a rubber material cannot be smoothly peeled from a liner.

  Then, this invention makes it the main objective to provide the liner which suppresses generation | occurrence | production of a crack.

In order to achieve the above object, in the present invention,
A flexible liner (inner winding flexible liner) used for winding a rubber material as a tire material,
Base fabric,
An adhesive layer provided on both sides of the base fabric so as to sandwich the base fabric, and
Comprising a film provided on an adhesive layer,
The adhesive layer is provided with a flexible liner characterized by comprising a thermoplastic polyester resin.

In a preferred embodiment, the thermoplastic polyester resin is a saturated polyester resin.

In a preferred embodiment, the saturated polyester resin is a saturated copolyester resin.

In a preferred embodiment, the adhesive layer is at least partially softened by the heat of the rubber material when the rubber material is wound.

In a preferred embodiment, the base fabric has a lattice form.

In a preferred embodiment, the film further comprises a release agent layer, and the release agent layer is a layer that is in direct contact with the rubber material when the rubber material is wound.

  In the present invention, since the adhesive layer comprises a thermoplastic polyester-based resin, the adhesive layer that bonds the base fabric and the film when the high-temperature rubber material is wound in a roll shape using a liner is a rubber. The material is softened by the heat of the material and becomes substantially flexible. Therefore, even when a high-temperature rubber material is wound into a winding shape using a liner, the adhesive layer can maintain a state in which no gap is formed in the region between the base fabric and the film, thereby It can suppress that a crack arises in an adhesive bond layer. Therefore, when the rubber material is wound using the liner of the present invention, the rubber material can be stably held on the liner, and the rubber material can be smoothly peeled from the liner.

  From the above, in the present invention, since the peel strength and breaking strength of the liner can be improved, a flexible and high toughness liner, that is, a thermoplastic polyester resin is used for the adhesive layer. The highly tough inner-wound film liner can be provided.

FIG. 1 shows a schematic perspective view of the liner of the present invention. FIG. 2 shows a partially enlarged sectional view of the liner of the present invention. FIG. 3 shows a schematic perspective view of a conventional liner.

  The present inventor has intensively studied to solve the problems of conventional liners and found the present invention.

  First, the liner 10 of the present invention will be described. It should be noted that the various elements shown in the drawings are merely schematically shown for understanding of the present invention, and the dimensional ratio, appearance, and the like may differ from the actual ones. The liner of the present invention substantially refers to a winding liner.

  The liner 10 of the present invention is used to prevent the rubber materials to be wound from adhering to each other when the belt-shaped rubber material extruded from an extruder that is a tire raw material is wound into a wound shape.

FIG. 1 shows a schematic perspective view of the liner of the present invention (including a partially enlarged plan view of the liner of the present invention). FIG. 2 shows a partially enlarged sectional view of the liner of the present invention. FIG. 3 shows a schematic perspective view of a conventional liner (including a partially enlarged plan view of the conventional liner).

As shown in FIG. 1, the liner 10 of the present invention includes a base fabric 1, an adhesive layer 2 provided on both sides of the base fabric 1 so as to sandwich the base fabric 1, and a film provided on the adhesive layer 2. 3. Although the liner 10 of this invention is not specifically limited, For example, it may have a dimension of width 10cm-100cm and length 1m-300m. The adhesive layer 2 is not particularly limited, but may have a thickness of 5 to 100 μm, and preferably has a thickness of 10 to 50 μm. The film 3 is not particularly limited, but may have a thickness of 5 to 300 μm, and preferably has a thickness of 10 to 100 μm. The liner 10 of the present invention may further comprise a release agent layer 4 on the film 3 as shown in FIG.

  The base fabric 1 has a lattice form as shown in a partially enlarged plan view in FIG. Specifically, the base fabric 1 includes a plurality of first base fabrics 1A extending in one direction and a plurality of second base fabrics extending in a direction intersecting with the extending direction of the first base fabric 1A. It is comprised from the base fabric 1B. In the base fabric 1, a space region surrounded by two adjacent first base fabrics 1A and two adjacent second base fabrics 1B is formed. As shown in FIG. 2, the adhesive layer 2 is formed in the space region without any gap. As the base fabric 1, a fiber fabric such as polyester, nylon, vinylon, or polypropylene is used. In particular, it is preferable to use polyester. The base fabric 1 may include carbon fibers that prevent electrification and / or aramid fibers that improve strength.

  Here, as described above, when the base fabric and the film are bonded with a thermosetting resin, the present inventor wound the rubber material using the liner 10 ′ due to the property of not softening. It has been found that cracks 5 occur at the portion where the base fabric 1 ′ and the film 3 ′ are bonded to each other when “rolling up” in a circular manner and “when peeling off” the rubber material taken up from the liner. (See FIG. 3). If the crack is generated, when the rubber material is peeled off from the liner, there is a possibility that a fragment of the liner generated by the crack adheres to the rubber material. In addition, when a new rubber material is wound in a state where the crack is generated, a portion where the rubber material does not adhere to the liner is generated, which may prevent the rubber material from being stably held on the liner. Therefore, the present inventor has found that it is appropriate to use a material comprising a thermoplastic polyester resin as the adhesive layer 2 constituting the liner 10. This is because polyester is a polar polymer and therefore has excellent adhesive properties to fibers, PET films and the like that are not found in nonpolar polymers such as polyethylene and polypropylene. The adhesive layer 2 referred to here refers to a layer that contains other components in addition to the thermoplastic polyester resin but does not contain a thermosetting resin such as an epoxy resin. As other components, for example, a filler may be contained. Examples of the filler include, but are not limited to, titanium oxide, calcium carbonate, and zinc oxide. The other components are not particularly limited, but may contain additives such as stabilizers.

  Further, a saturated polyester resin is preferably used as the thermoplastic polyester resin constituting the adhesive layer 2. That is, the thermoplastic polyester resin does not include unsaturated polyester having thermosetting properties. More preferably, the saturated polyester resin is a saturated copolymerized polyester resin which is a low melting point polymer. The saturated copolymerized polyester resin is obtained by copolymerizing a polyester having an ester bond (—COO—) in the main chain with another different monomer. Specifically, the saturated copolyester resin is a resin using the following acid component or diol component as a component to be copolymerized with a saturated homopolyester resin having a high melting point and high crystallinity such as PET and PBT. say.

  Specifically, the acid component includes aromatic dicarboxylic acids such as terephthalic acid, dimethyl terephthalic acid, isophthalic acid, and orthophthalic acid, and succinic acid, glutaric acid, adipic acid, β-methyladipic acid, pimelic acid, and suberin. At least one selected from the group consisting of acids, azelaic acid, sebacic acid, aliphatic carboxylic acids such as hexadecanedicarboxylic acid, and the like.

  Examples of the diol component include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, and 1,5-pentanediol. At least one selected from the group consisting of 3-methylpentanediol, 1,3-hexanediol, 1,6-hexanediol, 1,4-cyclohexanediol, diethylene glycol, triethylene glycol, dipropylene glycol and the like . That is, the saturated polyester resin used for the adhesive layer 2 of the present invention is not a saturated homopolyester resin having a high melting point and high crystallinity such as PET.

  In the present invention, since the adhesive layer 2 includes a thermoplastic polyester-based resin, when the high-temperature rubber material is wound into a wound shape using the liner 10, the adhesive is bonded to the base fabric 1 and the film 3. The agent layer 2 is at least partially softened by the heat of the rubber material and becomes substantially flexible. Therefore, even when a high-temperature rubber material is wound up in a winding shape using the liner 10, the adhesive layer 2 can maintain a state in which no space is formed in the region between the base fabric 1 and the film 3. Thereby, it is possible to suppress the occurrence of cracks in the adhesive layer 2. That is, it can be said that the adhesive layer 2 has a polyester hot melt adhesive. In particular, the adhesive layer 2 formed without a gap in the space region surrounded by the two adjacent first base fabrics 1A and the two adjacent second base fabrics 1B is formed on both sides of the base fabric 1, specifically Is larger in size than the adhesive layer 2 formed above and below the base fabric 1. Therefore, in an adhesive layer composed of a conventional thermosetting resin, stress tends to concentrate on the portion of the adhesive layer 2 formed without gaps in the space region when the rubber material is wound.

  However, in the present invention, since the adhesive layer 2 includes a thermoplastic polyester resin, the adhesive layer 2 has flexibility. Therefore, it can suppress that stress concentrates on the part of the adhesive layer 2 formed without a gap in the space region, thereby suitably suppressing the occurrence of cracks in the adhesive layer 2. it can. Therefore, when the rubber material is wound using the liner of the present invention, the rubber material can be stably held on the liner, and the rubber material can be smoothly peeled from the liner. In other words, it is possible to improve the peel strength and breaking strength of the liner, thereby providing a flexible and high tough liner, that is, a high tough inner winding using a thermoplastic polyester resin for the adhesive layer. A film liner can be provided. Therefore, the original function of the liner that prevents the wound rubber portions from adhering to each other can be appropriately exhibited. Therefore, the tire which is the final product can be formed into a desired shape. Moreover, the liner 10 of the present invention can be used repeatedly as the peel strength of the liner is improved. Therefore, the liner 10 of the present invention has an advantage from the viewpoint of environmental protection.

  In addition, when manufacturing a conventional liner, a resin composition containing a solvent, a thermosetting resin, etc. is used, and after a drying and pressurizing process, a film is placed on an adhesive layer provided to sandwich the base fabric. Since the thermosetting resin is contained in the resin composition, a void is formed between the base fabric and the adhesive layer due to the property that the resin composition does not soften. Therefore, there is a possibility that the air pool 6 is generated in the liner when air enters the gap (see FIG. 3). However, at the time of manufacturing the liner of the present invention, since a resin composition containing a thermoplastic polyester resin is used instead of a thermosetting resin, due to its softening property, the base fabric and the adhesive layer It is possible to suppress the formation of voids therebetween. Therefore, it is possible to suppress the occurrence of air pockets formed by air entering the gaps of the liner.

  When a high-temperature rubber material is wound in a wound shape using the liner having the air reservoir inside, the liner is oxidized by the air contained in the air reservoir, and locally changes to yellow in the liner. A “yellowing part” is formed. However, in the present invention, since the occurrence of the air reservoir can be suppressed, even when the high-temperature rubber material is wound in a winding shape using the liner 10, the liner is contained by the air contained in the air reservoir. Not easily oxidized. Therefore, the occurrence of “yellowing portions” locally formed in the liner can also be suppressed. That is, the beauty of the liner 10 of the present invention can be maintained.

  The release agent layer 4 provided on the film layer 3 shown in FIG. 2 is a layer that is in direct contact with the rubber material when the rubber material is wound. The release agent layer 4 is at least one selected from the group consisting of fluorine release agents, silicone release agents, stearate release agents, wax release agents, olefin release agents, and the like. May be. By providing the release agent layer 4, it is possible to suppress the occurrence of the above-described cracks, to suppress the occurrence of air pockets, and to suppress the occurrence of yellowing, and to smoothly remove the rubber material from the liner. Can be peeled off.

  Examples of the liner of the present invention will be described below.

  As an example of the present invention, the liner of the present invention in which the adhesive layer has a liner having a thermosetting resin and a thermoplastic polyester resin (specifically, a saturated copolymer polyester resin) is used. A comparative experiment such as a strength test was conducted.

<Comparative example>
First, a base fabric was prepared. Next, an adhesive layer was provided on both sides of the base fabric so as to sandwich the base fabric. Next, films were provided on both main surfaces of the adhesive layer. Further, a release agent layer was provided on the film on the side in direct contact with the rubber material when the rubber material was wound. Thus, a liner was formed.
(Material)
-Base fabric: polyester-Adhesive layer: Urethane two-component cross-linking adhesive-Film: Polyester film (Lumirror (registered trademark)
(Size)
・ Base fabric: 500d / 2 × 1000d / 1 6.8 × 7 / inch ・ Adhesive layer: 30 μm thick
・ Film: Thickness 50μm

<Example>
First, the base fabric 1 was prepared. Next, an adhesive layer 2 was provided on both sides of the base fabric 1 so as to sandwich the base fabric 1. Next, films were provided on both main surfaces of the adhesive layer 2. Further, a release agent layer 4 was provided on the film 3 on the side in direct contact with the rubber material when the rubber material was wound. Thus, the liner 10 of the present invention was formed.

(Material)
-Base fabric 1: Polyester-Adhesive layer 2: Saturated copolymer polyester resin-Film 3: Polyester film (Lumirror (registered trademark))

(Size)
・ Base fabric 1: 500d / 2 × 1000d / 1 6.8 × 7 / inch ・ Adhesive layer 2: 30 μm thick
Film 3: thickness 50 μm

<Result>
(1) When the belt-like rubber member extruded from the extruder was wound up and stored, the conventional liner was cracked. On the other hand, when the belt-shaped rubber member extruded from the extruder was wound up and stored, no crack was generated in the liner 10 of the present invention.
(2) When the belt-shaped rubber member extruded from the extruder is wound up and stored, the conventional liner has an air pocket. On the other hand, when the belt-like rubber member extruded from the extruder was wound up and stored, no air accumulation occurred in the liner 10 of the present invention.
(3) When the belt-shaped rubber member extruded from the extruder is wound up and stored, the conventional liner has a yellowing portion. On the other hand, when the belt-like rubber member extruded from the extruder was wound up and stored, the yellowed portion was not generated in the liner 10 of the present invention.

(table)

  The liner 10 of the present invention has been described above, but the present invention is not limited thereto, and various modifications can be made by those skilled in the art without departing from the scope of the invention defined in the following claims. Will be understood.

  The liner 10 of the present invention can be used in a line for producing unvulcanized rubber such as automobile tires.

10, 10 'liner 1 base fabric 2 adhesive layer 3, 3' film 4 release agent layer 5 crack 6 air trap

Claims (6)

A flexible liner used for winding a rubber material as a tire material,
Base fabric,
An adhesive layer provided on both sides of the base fabric so as to sandwich the base fabric, and
Comprising a film provided on the adhesive layer;
The flexible liner is characterized in that the adhesive layer comprises a thermoplastic polyester resin. The flexible liner according to claim 1, wherein the thermoplastic polyester resin is a saturated polyester resin. The flexible liner according to claim 2, wherein the saturated polyester resin is a saturated copolyester resin. The flexible liner according to any one of claims 1 to 3, wherein at the time of winding the rubber material, the adhesive layer is at least partially softened by heat of the rubber material. The flexible liner according to claim 1, wherein the base fabric has a lattice shape. Further comprising a release agent layer on the film,
The flexible liner according to claim 1, wherein the release agent layer is a layer that is in direct contact with the rubber material when the rubber material is wound up.

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