Paint roller and method for manufacturing the same

Abstract

This invention provides a paint roller whose roller portion, made of pile fabric, is less prone to peeling. [Solution] This paint roller is formed by bonding the back surface of a pile fabric 2, which is the roller portion, to the circumferential surface of a cylindrical polypropylene core 1 with polypropylene resin. The pile fabric 2 consists of a ground fabric 5 made of ground warp threads 3 and ground weft threads 4, and pile threads 6 rising from the back surface to the front surface of the ground fabric 5. The ground warp threads 3 and ground weft threads 4 are derived from spun yarns or multifilament yarns containing core-sheath type composite fibers in which the core component is made of polyethylene terephthalate and the sheath component is made of copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate. Due to the melting and solidification of the sheath component, the core-sheath type composite fibers are fused to each other, and are also fused at the intersections of the ground warp threads 3 and ground weft threads 4. Furthermore, the pile threads 6 present on the back surface of the ground fabric 5 are fused to the ground warp threads 3 and ground weft threads 4.

Description

Technical Field

[0001] The present invention relates to a coating roller in which a roller portion is bonded to the peripheral surface of a cylindrical core, and a method for manufacturing the same, and particularly relates to a coating roller in which the roller portion is formed of a pile knit fabric, and the pile knit fabric is less likely to peel off from the cylindrical core, and a method for manufacturing the same.

Background Art

[0002] As one type of coating roller, one in which a cylindrical core and a roller portion are bonded with an adhesive is known. For example, as described in Patent Document 1, a coating roller obtained by bonding a polypropylene cylindrical core and a roller portion made of a pile knit fabric using molten polypropylene resin as an adhesive is known. On the other hand, a pile knit fabric used for a coating roller is composed of a base knit fabric and pile yarns rising from the back surface to the front surface of the base knit fabric, and it is common to back the back surface of the base knit fabric with an acrylic resin or the like to prevent the pile yarns from falling off (Patent Document 2, paragraph 0037). However, even when the backed back surface of the pile knit fabric (that is, the backing surface) and the polypropylene cylindrical core are bonded with polypropylene resin, sufficient adhesive strength cannot be obtained, and the roller portion is often prone to peeling.

[0003] For this reason, it is also conceivable to obtain a coating roller by using an unbacked pile knit fabric as described in Patent Document 3. Patent Document 3 describes an invention in which a core-sheath composite fiber is used for part of the yarns constituting the base knit fabric, and the sheath portion is melted to make it difficult for pile yarns to come off. However, even when the back surface of such a pile knit fabric is bonded to a polypropylene cylindrical core with polypropylene resin, sufficient adhesive strength cannot be obtained, and the roller portion is often prone to peeling.

[0004]

Patent Document 1

Patent Document 2

[0005] The object of the present invention is to provide a paint roller in which the back surface of an unbacked pile knitted fabric and a polypropylene cylindrical core are bonded with polypropylene resin, thereby increasing the adhesive strength and making the roller portion less likely to peel off. [Means for solving the problem]

[0006] The present invention solves the above problem by using a spun yarn or multifilament yarn containing a specific core-sheath type composite fiber as the ground yarn of a pile knitted fabric, and by fusing the entire spun yarn or multifilament yarn. That is, the present invention relates to a paint roller in which the back surface of a pile knitted fabric, which is the roller portion, is bonded to the circumferential surface of a polypropylene cylindrical core with polypropylene resin, wherein the pile knitted fabric consists of a ground knitted fabric made of ground yarn and pile yarns rising from the back surface to the front surface of the knitted fabric, the ground yarn is derived from a yarn containing a core-sheath type composite fiber in which the core component is made of polyethylene terephthalate and the sheath component is made of copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate, the core-sheath type composite fibers as well as the ground yarn and the pile yarns present on the back surface of the ground knitted fabric are fused together by the melting and solidification of the sheath component, and the polypropylene resin is in contact with the back surface of the ground knitted fabric, bonding the polypropylene cylindrical core and the pile knitted fabric.

[0007] In this invention, the term "pile knitted fabric" is used to encompass both pile woven fabrics and pile knitted fabrics. First, we will explain the cases in which pile woven fabrics are used in this invention.

[0008] [In the case of pile fabrics] The paint roller according to the present invention is formed by bonding the back surface of a pile fabric 2, which is the roller portion, to the circumferential surface of a polypropylene cylindrical core 1 with a polypropylene resin (not shown). The pile fabric 2 used in the present invention consists of a ground fabric 5 made of ground warp threads 3 and ground weft threads 4, and pile threads 6 rising from the back surface to the front surface of the ground fabric 5. A cross-sectional end view showing an example of such a pile fabric 2 is shown in Figure 2. Furthermore, a plan view of the back surface of the pile fabric 2 used in the present invention (magnification 30x) is shown in Figure 3, and an oblique view (magnification 30x) is shown in Figure 4.

[0009] From the viewpoint of shape stability, the plain weave structure of the ground fabric 5 is most preferable, but other weave structures such as twill or satin weave may also be used. The ground fabric 5 is composed of ground warp threads 3 and ground weft threads 4. The thickness of the ground warp threads 3 and ground weft threads 4 is arbitrary, but it is preferable that they be around 5 to 30 count cotton yarns. The density of the ground warp threads 3 and ground weft threads 4 is also arbitrary, but it is preferable that they be around 20 to 60 threads / inch. In particular, as shown in Figure 3, it is preferable that there is a small space (mesh) surrounded by the ground warp threads 3 and ground weft threads 4. When viewed in plan, it is preferable that this space (mesh) is a through hole where no threads are present. This is because the polypropylene resin filling into this space makes it difficult for the pile fabric 2, which is the roller part, to peel off.

[0010] The warp threads 3 and weft threads 4 are derived from yarn containing core-sheath type composite fibers, the core component of which is polyethylene terephthalate and the sheath component of which is a copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate. Specifically, the warp threads 3 and weft threads 4 are obtained by heat-treating yarn containing core-sheath type composite fibers to melt and solidify only the sheath component, thereby fusing the core-sheath type composite fibers together. As yarn containing core-sheath type composite fibers, spun yarn mainly composed of core-sheath type composite short fibers or multifilament yarn mainly composed of core-sheath type composite filament fibers are used. In particular, spun yarn made of 100% by mass of core-sheath type composite short fibers or multifilament yarn made of 100% by mass of core-sheath type composite filament fibers are preferably used. In this spun yarn or multifilament yarn, the core-sheath type composite fibers are fused together by the melting and solidification of the sheath component. In particular, as shown in Figure 3, it is preferable that the sheath component acts as the matrix, with the core component existing within the matrix while maintaining its original fiber form, and that the spun yarn or multifilament yarn becomes plastic-like. Furthermore, as a core-sheath type composite fiber, it is preferable that it is a concentric core-sheath type composite fiber with a circular cross-section in which the core component and sheath component are concentric. With a concentric core-sheath type composite fiber, even if only the sheath component is melted and solidified, it is possible to prevent the core component, which maintains its original fiber form, from crimping or becoming distorted, resulting in relatively straight warp threads 3 and weft threads 4. Moreover, due to the melting and solidification of this sheath component, the warp threads 3 and weft threads 4 are fused at their intersections, and the pile threads 6 on the back of the fabric 5 are also fused with the warp threads 3 and weft threads 4. Conventional known copolymer polyesters can be used as the copolymer polyester that forms the sheath component, but it is particularly preferable to use amorphous isophthalic acid copolymer polyester. This is because this copolymer polyester has excellent adhesion to polypropylene resin. Furthermore, the softening point of amorphous isophthalic acid copolymer polyester is approximately 110°C, and it melts at a temperature below the melting point of polyethylene terephthalate, which is the core component (approximately 250°C).

[0011] The pile yarn 6 may be in the form of a loop pile, rising from the back to the front of the ground fabric 5 and forming a loop at the top, or in the form of a cut pile, with the top cut off. In the present invention, it is common to obtain a pile fabric by weaving a double pile fabric base and then cutting it near the middle, so the form of the pile yarn 6 is generally cut pile. The pile yarn 6 is preferably a multifilament yarn. For example, it is preferable to use a multifilament yarn made by twisting together several strands of multifilament yarn with a density of 70-600 decitex / 24-600 filaments. When such a multifilament yarn is used, the tips of the cut pile become fluffy and flaky, and the paint is well impregnated, making it suitable for the roller part of a paint roller. Furthermore, from the viewpoint of weather resistance and durability, the material of the pile yarn 6 is preferably polyethylene terephthalate multifilament yarn.

[0012] The pile fabric 2 is bonded to the circumferential surface of the polypropylene cylindrical core 1 by polypropylene resin on its reverse side. As mentioned above, the reverse side of the pile fabric 2 consists of the ground fabric 5 and the pile yarns 6 on its reverse side. The ground warp threads 3 and ground weft threads 4 that make up the ground fabric 5 are fused together as core-sheath type composite fibers, and preferably have a plastic-like appearance. The ground warp threads 3 and ground weft threads 4 are fused at their intersections, and the pile yarns 6 are fused together by the ground weft threads 3 and ground weft threads 4. Therefore, as shown in Figures 2 and 4, the reverse side of the pile fabric 2 is convex where the ground warp threads 3 and pile yarns 6 overlap, and concave in other areas, creating an uneven surface. The molten polypropylene resin penetrates into these uneven surfaces and solidifies, increasing the adhesive strength between the pile fabric 2 and the polypropylene cylindrical core 1, making the pile fabric 2 less likely to peel off. Furthermore, as mentioned above, if there are gaps (mesh) in the base fabric 5, the molten polypropylene resin will penetrate and solidify into these gaps, thereby increasing the adhesive strength between the pile fabric 2 and the polypropylene cylindrical core 1, and making the pile fabric 2 less likely to peel off.

[0013] [In the case of pile knit fabrics] In the present invention, the pile knitted fabric is generally either a warp knitted fabric or a weft knitted fabric (circular knitted fabric). For the warp knitted fabric, a raschel knit structure with excellent shape retention is preferred. In the case of a raschel knit structure, the pile knitted fabric consists of a ground knitted fabric made of ground chain yarn and ground insertion yarn, and pile yarns that rise from the back to the front of this ground knitted fabric. For the weft knitted fabric, a circular knit structure such as a jersey knit structure with excellent shape retention is preferred. In the case of a circular knit structure, the pile knitted fabric consists of a ground knitted fabric made of ground loop yarn, and pile yarns that rise from the back to the front of this ground knitted fabric.

[0014] The ground chain yarn, ground insertion yarn, and ground loop yarn are derived from yarn containing core-sheath type composite fibers, similar to the ground warp yarn 3 and ground weft yarn 4, where the core component is made of polyethylene terephthalate and the sheath component is made of copolymerized polyester that melts at a temperature lower than the melting point of polyethylene terephthalate. Specifically, the ground chain yarn, ground insertion yarn, and ground loop yarn are obtained by heat-treating yarn containing core-sheath type composite fibers to melt and solidify only the sheath component, thereby fusing the core-sheath type composite fibers together. As the yarn containing core-sheath type composite fibers, spun yarn or multifilament yarn is used, similar to the case of ground warp yarn 3 and ground weft yarn 4, and it is preferable that these are plastic-like. In the case of knitted fabrics, the ground chain yarn, ground insertion yarn, and loop yarn are fused together by the melting and solidification of the sheath component of the core-sheath type composite fibers, as well as at the intersections of the ground chain yarn and ground insertion yarn, and between the loop yarns themselves. The pile yarn on the back of the knitted fabric is also fused with the ground chain yarn, ground insertion yarn, or loop yarn.

[0015] The pile yarn may be in the form of a loop pile, rising from the back to the front of the base knitted fabric and forming a loop at the top, or in the form of a cut pile, with the top cut off. When using Raschel knitting as the base knitted fabric, with ground chain yarn and ground insertion yarn as the ground yarns, it is common to knit a double Raschel knitted fabric base on a double Raschel knitting machine and then cut it near the middle to obtain the pile knitted fabric, so the form of the pile yarn is generally cut pile. The pile yarn rises from the back to the front of the ground chain yarn of the Raschel knit. Also, when using a circular knitting structure such as jersey knit as the base knitted fabric, the pile knitted fabric base is knitted on a pile circular knitting machine, so it may be in the form of a loop pile or a cut pile, but cut pile is generally used. The pile yarn rises from the back to the front of the ground loop yarn of the base knitted fabric. The contents of the pile yarn are the same as in the case of pile yarn 6 described above.

[0016] The pile knitted fabric is bonded to the circumferential surface of a polypropylene cylindrical core by polypropylene resin on its reverse side. On the reverse side of the pile knitted fabric, there is the ground knitted fabric and the pile yarns on its reverse side. The ground chain yarn, ground insertion yarn, or ground loop yarn that make up the ground knitted fabric are fused together as core-sheath type composite fibers, and preferably have a plastic-like appearance. The ground chain yarn and ground insertion yarn are fused at their intersections, and the ground loop yarns are fused together. The pile yarns that rise from the reverse side of the ground chain yarn or ground loop yarn are also fused to the reverse side of the ground knitted fabric. Therefore, the reverse side of the pile knitted fabric is convex where the ground chain yarn and pile yarn overlap, and convex where the ground loop yarn and pile yarn overlap, and concave in other areas, creating an uneven surface. The molten polypropylene resin penetrates into the unevenness and solidifies, increasing the adhesive strength between the pile knitted fabric and the polypropylene cylindrical core, making the pile knitted fabric less likely to peel off. Furthermore, if spaces (gaps) exist in the base knitted fabric, the molten polypropylene resin will penetrate and solidify into these spaces, resulting in stronger adhesion between the pile knitted fabric and the polypropylene cylindrical core, making the pile knitted fabric less likely to peel off. In particular, if a raschel knit structure is used as the pile knitted fabric, it becomes easier to form larger gaps, making the pile knitted fabric even less likely to peel off.

[0017] [How to manufacture a paint roller] The method for manufacturing a paint roller according to the present invention can be obtained by conventionally known methods, except for the use of a specific pile knitted fabric. That is, the method for manufacturing a paint roller comprises a pile knitted fabric bonding step in which a strip-shaped pile knitted fabric is spirally wound around the circumferential surface of a polypropylene cylindrical core such that the back surface of the strip-shaped pile knitted fabric faces the circumferential surface of the polypropylene cylindrical core, and the strip-shaped pile knitted fabric is bonded to the circumferential surface of the polypropylene cylindrical core with polypropylene resin, wherein the strip-shaped pile knitted fabric consists of a ground knitted fabric made of ground yarn and pile yarns rising from the back surface to the front surface of the ground knitted fabric, the ground yarn is derived from yarn containing a core-sheath type composite fiber in which the core component is made of a high-melting-point polymer and the sheath component is made of a low-melting-point polymer, and the core-sheath type composite fibers as well as the pile yarns present on the back surface of the ground yarn and the ground knitted fabric are fused together by the melting and solidification of the sheath component. The polypropylene resin used to bond the strip-shaped pile knitted fabric may be a molten polypropylene resin applied to the circumferential surface of a polypropylene cylindrical core, or it may be a polypropylene resin obtained by heating the circumferential surface of a polypropylene cylindrical core and softening or melting the core surface. If the strip-shaped pile knitted fabric is wound spirally so that its back surface comes into contact with the polypropylene resin before the polypropylene resin hardens, the strip-shaped pile knitted fabric can be bonded to the circumferential surface of the polypropylene cylindrical core by the polypropylene resin.

[0018] Furthermore, the polypropylene cylindrical core can be obtained by the plastic core roller manufacturing method described in Patent Document 1. That is, a polypropylene cylindrical core 1 can be obtained by spirally winding a polypropylene strip sheet 1'. Figure 5 is a schematic side view showing the manufacturing process of a paint roller according to an example of the present invention using the plastic core roller manufacturing method. Based on Figure 5, an example of manufacturing a paint roller according to the present invention is as follows. That is, a core forming step of spirally winding a polypropylene strip sheet 1' to form a polypropylene cylindrical core 1, a molten resin coating step of applying molten polypropylene resin 7 to the circumferential surface of the polypropylene cylindrical core 1, and a pile fabric bonding step of spirally winding a strip pile fabric 2' so that the back surface of the strip pile fabric 2' contacts the polypropylene resin 7 before the polypropylene resin 7 solidifies, thereby obtaining a paint roller. Then, as shown in Figure 5, by cutting the cylinder with a cutter 8 to an appropriate length, it becomes a paint roller that can be actually used. It is preferable to use a spindle 9 to spirally wind the polypropylene strip sheet 1'. Furthermore, it is preferable to extrude the molten polypropylene resin 7 into a film using an extrusion die 10 and apply it to the circumferential surface of the polypropylene cylindrical core.

[0019] [Manufacturing method for strip-shaped pile fabric] The strip-shaped pile fabric 2' used in the manufacturing method of the paint roller can be obtained by the following method. First, a spun yarn or multifilament yarn is prepared as the ground warp thread preform and ground weft thread preform, which include a core-sheath type composite fiber in which the core component is made of polyethylene terephthalate and the sheath component is made of copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate. A multifilament yarn is prepared as the pile yarn 6. Note that the ground warp thread 3 and ground weft thread 4 refer to the core-sheath type composite fiber after the sheath component has melted and solidified, while the ground warp thread preform and ground weft thread preform refer to the core-sheath type composite fiber before the sheath component has melted. The ground warp thread preform is generally starched to improve its strength, but in the present invention, it is preferable to improve its strength by using a twisted yarn made by twisting multiple spun yarns or multifilament yarns together and not to starch it. Preferably, a double yarn made by twisting two spun yarns together is used as the warp thread base. By not sizing the warp thread base, the fusion due to the melting and solidification of the sheath component is not inhibited by the sizing, nor is the adhesion with the polypropylene resin inhibited. Furthermore, since the weft thread base does not require the same strength as the warp thread base, one that is not originally sizing is used.

[0020] Next, the prepared ground warp preforms, ground weft preforms, and pile yarns 6 are supplied as warp threads and placed on a double pile loom (also called a double velvet loom) to weave a double pile fabric base consisting of two upper and lower ground fabric preforms and pile yarns connecting the two ground fabric preforms. Here, the ground fabric 5 refers to the fabric after the sheath component of the core-sheath type composite fiber has melted and solidified, while the ground fabric preforms refer to the fabric before the sheath component of the core-sheath type composite fiber has melted. The pile yarns 6 near the middle of the thickness direction of the obtained double pile fabric base are cut to obtain two pile fabric bases. Then, the pile fabric raw material is heat-treated to melt and solidify the sheath component in the core-sheath type composite fibers, causing the core-sheath type composite fibers to fuse together to form ground warp threads 3 and 4. Furthermore, the ground warp threads 3, ground weft threads 4, and the pile threads 6 present on the back surface of the ground fabric 5 are fused together to obtain a pile fabric. Specifically, the heat treatment can be performed by fixing the pile fabric raw material with a pin tenter and setting it to a temperature at which the sheath component melts and the core component is not affected by the heat (for example, 120-220°C). The heat treatment temperature should be set appropriately according to the heat treatment rate, as long as it is a temperature at which the sheath component melts and the core component is not affected by the heat. This pile fabric is then slit into strips to obtain strip-shaped pile fabric 2'.

[0021] Alternatively, before cutting the pile yarns 6 near the midpoint in the thickness direction of the double pile fabric raw material, the double pile fabric raw material may be heat-treated to melt and solidify the sheath component in the core-sheath type composite fiber, causing the core-sheath type composite fiber to fuse together to form the ground warp yarns 3 and 4, and the ground warp yarns 3, ground weft yarns 4 and the pile yarns 6 present on the back surface of the ground fabric 5 may be fused together to obtain a double pile fabric. Then, the pile yarns 6 near the midpoint in the thickness direction of this double pile fabric may be cut to obtain two pile fabrics, and these pile fabrics may be slit into strips to obtain a strip-shaped pile fabric 2'. [Effects of the Invention]

[0022] In the coating roller according to the present invention, the back surface of the specific pile knitted fabric is adhered to the peripheral surface of the polypropylene cylindrical core by polypropylene resin, so the polypropylene resin bites into the back surface of the base knitted fabric of the pile fabric, and the adhesive strength is increased due to the anchor effect. Therefore, the coating roller according to the present invention achieves the effect that the pile knitted fabric serving as the roller part is less likely to peel off from the polypropylene cylindrical core. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] [Figure 1] FIG. 1 is a schematic perspective view of a coating roller according to an example of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional end view of a pile fabric used in an example of the present invention. [Figure 3] FIG. 3 is a photograph of the back surface of a pile fabric used in an example of the present invention in a top plan view. [Figure 4] FIG. 4 is a perspective photograph of the back surface of a pile fabric used in an example of the present invention. [Figure 5] FIG. 5 is a schematic side view showing the manufacturing steps of a coating roller according to an example of the present invention. DESCRIPTION OF REFERENCE SIGNS

[0024] 1 Polypropylene cylindrical core 1' Polypropylene strip sheet 2 Pile fabric 2' Strip-shaped pile fabric 3 Ground warp 4 Ground weft 5 Base fabric 6 Pile yarn 7 Molten polypropylene resin 8 Cutter 10 Extrusion die

Claims

1. In a paint roller in which the back surface of a pile knit fabric, which is the roller portion, is bonded to the circumferential surface of a cylindrical polypropylene core with polypropylene resin, The aforementioned pile knitted fabric consists of a ground knitted fabric made of ground yarns and pile yarns that rise from the back surface to the front surface of the knitted fabric. The ground yarn is derived from a yarn containing core-sheath type composite fibers, the core component of which is polyethylene terephthalate and the sheath component of which is a copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate, and the melting and solidification of the sheath component causes the core-sheath type composite fibers to fuse with each other, as well as the ground yarn and the pile yarn present on the back surface of the knitted fabric. A paint roller characterized in that the polypropylene resin is in contact with the back surface of the knitted fabric, thereby bonding the polypropylene cylindrical core and the pile knitted fabric.

2. The paint roller according to claim 1, wherein the pile knitted fabric is a pile fabric, the ground yarn is a ground fabric consisting of ground warp yarns and ground weft yarns, and the ground warp yarns, ground weft yarns and pile yarns present on the back surface of the ground fabric are fused together.

3. The paint roller according to claim 1, wherein the pile knit fabric is a pile knit fabric with a Raschel knit structure, the ground yarn is a ground knit fabric consisting of a ground chain knit yarn and a ground insertion yarn, and the ground chain knit yarn, the ground insertion yarn and the pile yarn present on the back surface of the ground knit fabric are fused together.

4. The paint roller according to claim 1, wherein the pile knit fabric is a pile knit fabric with a circular knit structure, the ground yarn is a ground knit fabric made of ground loop yarn, and the ground loop yarn and the pile yarn present on the back surface of the ground knit fabric are fused together.

5. The paint roller according to claim 1, wherein the pile yarn is polyethylene terephthalate multifilament yarn.

6. The paint roller according to claim 1, wherein the sheath component of the core-sheath composite fiber is amorphous isophthalic acid copolymer polyester.

7. A paint roller according to claim 1, wherein the base yarn is plastic-like due to the fusion of core-sheath type composite fibers.

8. In a method for manufacturing a paint roller, comprising a pile fabric bonding step, the back side of a strip of pile fabric is wound spirally around the circumferential surface of a polypropylene cylindrical core so that the back side of the strip of pile fabric faces the circumferential surface of the polypropylene cylindrical core, and the strip of pile fabric is bonded to the circumferential surface of the polypropylene cylindrical core with polypropylene resin, The aforementioned strip-shaped pile knitted fabric consists of a ground knitted fabric made of ground yarns and pile yarns rising from the back surface to the front surface of the ground knitted fabric. The method for manufacturing a paint roller is characterized in that the ground yarn is derived from a yarn containing a core-sheath type composite fiber in which the core component is made of a high-melting-point polymer and the sheath component is made of a low-melting-point polymer, and the core-sheath type composite fibers, as well as the ground yarn and the pile yarn present on the back surface of the knitted fabric, are fused together by the melting and solidification of the sheath component.

9. A method for manufacturing a paint roller according to claim 8, wherein the pile fabric bonding step comprises a molten resin coating step of applying molten polypropylene resin to the circumferential surface of a polypropylene cylindrical core, and a step of spirally winding the strip-shaped pile fabric so that the back surface of the strip-shaped pile fabric comes into contact with the polypropylene resin before the polypropylene resin hardens, thereby bonding the strip-shaped pile fabric to the circumferential surface of the polypropylene cylindrical core.

10. A method for manufacturing a paint roller according to claim 8, wherein the pile fabric bonding step comprises a heating step of heating the circumferential surface of a polypropylene cylindrical core to soften or melt the polypropylene resin on the circumferential surface of the polypropylene cylindrical core, and a step of winding the strip-shaped pile fabric spirally so that the back surface of the strip-shaped pile fabric comes into contact with the polypropylene resin, before the polypropylene resin solidifies, thereby bonding the strip-shaped pile fabric to the circumferential surface of the polypropylene cylindrical core.

11. A method for manufacturing a paint roller according to claim 9 or 10, wherein a polypropylene strip sheet is wound spirally to obtain a polypropylene cylindrical core.

12. The method for manufacturing a paint roller according to claim 8, wherein the strip-shaped pile knitted fabric is a strip-shaped pile fabric.

13. A weaving process in which yarns containing core-sheath type composite fibers, in which the core component is made of polyethylene terephthalate and the sheath component is made of copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate, are used as the ground warp threads and ground weft threads, and multifilament yarn is used as the pile yarn, and the weaving process is carried out on a double pile loom to weave a double pile fabric base consisting of two upper and lower ground fabric bases and pile yarns that connect the two ground fabric bases, A cutting step to obtain two pile fabric rolls by cutting the pile yarn near the middle of the thickness direction of the double pile fabric roll, A fusion process is performed in which the pile fabric raw material is heat-treated to melt and solidify the sheath component in the core-sheath type composite fiber, thereby fusing the core-sheath type composite fiber together to form ground warp threads, ground weft threads and ground fabric, and also fusing the ground warp threads, ground weft threads and the pile threads present on the back of the ground fabric to obtain a pile fabric, and A method for manufacturing a strip-shaped pile fabric used in claim 12, comprising a processing step of slitting the aforementioned pile fabric into a strip shape.

14. A weaving process in which yarns containing core-sheath type composite fibers are used as the ground warp threads and ground weft threads, the core component of which is polyethylene terephthalate and the sheath component of which is copolymer polyester that melts at a temperature lower than the melting point of polyethylene terephthalate, multifilament yarn is used as the pile yarn, and the yarns are fed onto a double pile loom to weave a double pile fabric base consisting of two upper and lower ground fabrics and pile yarns that connect the two ground fabrics. A fusion process is performed in which the double pile fabric raw material is heat-treated to melt and solidify the sheath component in the core-sheath type composite fiber, thereby fusing the core-sheath type composite fiber together to form ground warp threads, ground weft threads and ground fabric, and also fusing the pile threads present on the back surface of the ground warp threads, ground weft threads and ground fabric to obtain a double pile fabric. A cutting step to obtain two pile fabrics by cutting the pile yarn near the middle of the thickness direction of the double pile fabric, and A method for manufacturing a strip-shaped pile fabric used in claim 12, comprising a processing step of slitting the aforementioned pile fabric into a strip shape.

15. A method for manufacturing a strip-shaped pile fabric according to claim 13 or 14, wherein the ground warp threads are a plied yarn made by twisting together a plurality of spun yarns or multifilament yarns.

16. A method for manufacturing a strip-shaped pile fabric according to claim 15, wherein the warp threads are double-ply yarns formed by twisting two spun yarns together.

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