JP2016117966A - String with fused peripheral surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a string with higher strength than the conventional polypropylene resin string with a fused peripheral surface while retaining the characteristics of the polypropylene resin string with the fused peripheral surface which is soft and can be easily tied by hand, and whose knot is not easily untied.SOLUTION: A string with a fused peripheral surface is a string formed by gathering and bundling polypropylene resin films subjected to longitudinal stretching with width direction stretching and by thermally fusing the outer peripheral surface thereof. The string is provided with a core part on a central side. The core part comprises a polyethylene terephthalate multifilament or a doubled yarn formed by twisting together a polyethylene terephthalate multifilament and a colored polypropylene resin film subjected to longitudinal stretching with width direction narrow stretching.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a synthetic resin string, in particular, a polypropylene composite string having a core at the center, which is soft, easy to tie by hand, difficult to knot, and further, made of conventional polypropylene. It relates to a high-strength string compared to the peripheral fusion-bonded string.

  Conventionally, “poly rope”, which is a string made of a synthetic resin and made of a polypropylene resin made by converging a longitudinally stretched film accompanied by a thin-walled widthwise stretching, has been widely used. Hereinafter, “polypropylene” may be referred to as “PP” in the present specification.

  Poly rope has a relatively large volume, is soft and easy to use, and has been widely used today. Hereinafter, a longitudinally stretched film accompanied by stretching in the width direction made of a thin PP resin may be simply referred to as “PP stretched film”.

  As an extension of the production technology for poly ropes, peripheral surface fused strings in which the converged PP stretched film is heated and the surface is fused have been provided and spread on the market.

  Since the circumferential surface fusion string has the surface of the string fused, there is no fluff, the stretched surface melts and has an appropriate roughness, and is not easily frayed with an appropriate surface resistance. Therefore, it was soft and easy to tie by hand, the knot was difficult to break, and the cut end was beautifully finished.

  In the above-mentioned string in which a longitudinally stretched film made of PP resin and accompanied by stretching in the width direction is converged and the outer peripheral surface is heat-welded, the PP stretched film is heated to melt the surface. About a 40% reduction in the tensile strength of the minute occurs.

  However, even if there is a decrease in tensile strength of about 40%, it has been conventionally used in a field that is easy to use or in a grade that has been upgraded to the required strength.

  Various proposals have been made for synthetic resin composite strings for the purpose of increasing strength and the like.

  For example, Patent Document 1 discloses a composite for the purpose of improving the bending fatigue property of a high-strength fiber made of an aromatic polyester capable of forming an anisotropic melt phase and improving the strength utilization rate of a yarn as a cord. Strings have been proposed. Patent Document 2 proposes a composite string-like product using a tension member having excellent heat resistance as a core.

JP-A-6-2236 JP 2010-196207 A

  This invention is soft, easy to tie easily by hand, and retains the characteristics of the PP peripheral surface fused cord that is difficult to untie the knot, and has a higher strength than the conventional PP peripheral surface fused cord. The purpose is to provide a string.

The invention described in claim 1
A string made by converging a longitudinally stretched film made of polypropylene resin and stretched in the width direction and heat-sealing the outer peripheral surface, and has a core part on the center side, and the core part is made of polyethylene terephthalate This is a peripheral surface fusion string made of multiple filaments.

The invention according to claim 2
A string made by converging a longitudinally stretched film made of polypropylene resin and stretched in the width direction and heat-sealing the outer peripheral surface, and has a core part on the center side, and the core part is made of polyethylene terephthalate A multi-filament and a fusion-bonded circumferential surface made of a yarn obtained by combining and twisting a colored polypropylene resin-made longitudinally stretched film accompanied by a narrow stretch in the width direction.

The invention described in claim 3
The peripheral surface fusion string according to claim 1 or 2, wherein an outer periphery of the core portion and a portion surrounding the core portion are integrated by bonding or heat fusion.

  Hereinafter, “polyethylene terephthalate” may be referred to as “PET” in the present specification.

  According to the present invention, while maintaining the characteristics of the PP peripheral surface fused cord that is soft, easy to tie by hand, and difficult to untie the knot, it is further high compared to the conventional PP peripheral surface fused cord. A strong string can be provided.

  Moreover, the thickness of a string can be provided as a thin string for high strength.

The schematic perspective view explaining an example of the process of manufacturing the peripheral surface fusion string which concerns on one Embodiment of this invention. The perspective view which expands and demonstrates a part of manufacturing process shown in FIG. The schematic perspective view explaining other examples of the process of manufacturing the peripheral surface fusion string concerning one embodiment of the present invention. The schematic perspective view explaining the further another example of the process of manufacturing the peripheral surface fusion string which concerns on one Embodiment of this invention. The sectional view of the peripheral surface fusion string concerning one embodiment of the present invention. Sectional drawing of the surrounding surface fusion string which concerns on other embodiment of this invention.

The circumferential surface fusion string of this embodiment is
A string made by converging a longitudinally stretched film made of PP resin and stretched in the width direction, and heat-sealing the outer peripheral surface, and having a core part on the center side,
The core part is made of a multifilament made of PET,
Or
The said core part consists of a multi-filament made from PET, and the combined yarn which twisted together the longitudinal direction stretched film accompanying the width direction narrow drawing made from colored PP resin.

  The circumferential surface fusion string of this embodiment is intended to increase the strength of the circumferential surface fusion string made of PP by disposing the above-described core portion at substantially the center of the circumferential surface fusion string made of PP. .

  That is, since the PET multifilament (yarn obtained by twisting a plurality of single PET fibers) constituting the core portion has high strength, it has higher strength than the conventional PP fused cord. String can be provided.

  On the other hand, the surface of the peripheral surface fusion string retains the features of the peripheral surface fusion string obtained by converging the longitudinally stretched film accompanied by the width direction stretching made of PP resin and thermally fusing the outer peripheral surface. . Therefore, it is possible to maintain the characteristics of a PP fused string that is easily knotted easily by hand and difficult to unknot.

  Further, the core part is composed of PET multifilament or PET multifilament and a longitudinally stretched film accompanied by a width-wise narrow stretch made of colored PP resin. Since it is a composite yarn, the characteristic that the conventional PP fused string has the softness can also be maintained.

  Peripheral surface fusion of an embodiment in which a core part is constituted by a combined yarn obtained by combining and twisting a multifilament made of PET and a longitudinally stretched film with a widthwise narrow stretch made of colored PP resin In the case of a string, even when PET fibers that are not colored as PET multifilaments are used, it can be visually determined from the outside that the PET fibers are reinforced products used in the core part, and confusion during use can be avoided. Can be avoided.

  Since the PET fiber is white, when only the uncolored PET multifilament is used for the core, it is difficult to visually determine from the outside that the PET fiber is a reinforced product used for the core. There is a risk of confusion during use.

  Although it is possible to color the PET fiber by pigmenting, it is not possible to handle small lot products because the production lot becomes large.

  On the other hand, since the PP film is easy to be colored, the PP film is colored, and the longitudinally stretched film accompanied by the widthwise narrow stretch of PP resin and the multifilament made of PET are twisted together. By forming the core portion with the combined yarn, it is advantageous to identify the peripheral surface fusion string provided with the core portion exhibiting high strength.

  In this embodiment, the colored PP film can be increased in strength by being highly stretched in the longitudinal direction.

  1 and 2 illustrate an example of a process for manufacturing the peripheral surface fusion string of this embodiment.

  Using a conventional apparatus for producing a peripheral surface fusion string in which a longitudinally stretched film accompanied by a width direction stretching made of PP resin is converged and heat-sealing the outer peripheral surface, a PP stretched film 10 is bonded to a fusion apparatus. The peripheral surface fusion string is manufactured by drawing in the direction of the arrow 11 into the fusion nozzle 3 formed on the one hot plate 2a, 2b.

  At this time, as shown in FIG. 2, the PET multifilament 8 that has passed through the feeding tube 6 is simultaneously fed as indicated by an arrow 12, and a longitudinally stretched film accompanied by PP resin widthwise stretching. The peripheral surface fusion string of this embodiment having a core portion made of PET multifilaments on the center side can be manufactured by converging the outer peripheral surfaces and heat-sealing the outer peripheral surface.

  If the PET multifilament indicated by reference numeral 8 is a combined yarn obtained by combining and twisting a PET multifilament and a longitudinally stretched film with a widthwise narrow stretch made of colored PP resin. , A string obtained by converging a longitudinally stretched film accompanied by stretching in the width direction made of PP resin and heat-sealing the outer peripheral surface, and a multifilament made of PET and a width direction made of colored PP resin The peripheral surface fusion string of this embodiment provided with the core part which consists of the combined yarn which twisted together the longitudinal direction stretched film accompanied by narrow drawing along the center side can be manufactured.

  In this embodiment, the outer periphery of the core part and the part surrounding the core part can be formed into a peripheral surface fusion string having a structure in which the core part is integrated by bonding or heat fusion.

  If the core made of PET multifilament for enhancing strength and the portion surrounding the core are not integrated, there is a reinforcing effect, but only the core can easily come off. Nevertheless, since the tensile strength as a string is higher than that of a conventional PP fused string, it can be used depending on the application, but it is advantageous if the core part has a structure that does not easily come off.

  If the outer periphery of the core part and the part surrounding the core part are integrated by joining or heat sealing, the reinforcing effect is exhibited, and the core part is exhibited. It becomes a peripheral surface fusion string that cannot be easily removed.

  When the outer periphery of the core part and the part surrounding the core part are integrated by bonding, the surface of the PET multifilament or the PET multifilament and the width direction narrow width extension made of colored PP resin After applying the adhesive to the surface of the combined yarn that is twisted together with the longitudinally stretched film accompanied with the longitudinal direction, the longitudinal direction stretching with the width direction stretching made of PP resin as described in FIGS. Using a conventional fusing device that converges the film and heat-bonds the outer peripheral surface to produce a peripheral fusing string, a PP stretched film and a PET multifilament with an adhesive applied to the surface, or a surface It is possible to employ a method of uniting the combined yarn coated with an adhesive.

  FIG. 3 illustrates an example of this embodiment. The multifilament 8 made of PET passes through the adhesive 5 accommodated in the adhesive accommodating tank 4. Thus, the PET multifilament 9 with the adhesive applied on the surface converges the longitudinally stretched film with the width direction stretch made of PP resin as described with reference to FIGS. The film is united with the PP stretched film 10 by a conventional fusing device 1 that manufactures a fusing string with a peripheral surface heat-sealed.

  As an adhesive, after manufacturing a peripheral surface fusion string, in which the outer periphery of the core part and the part surrounding the core part are integrated by bonding, the adhesive is gradually dried over time. It is desirable that the adhesive is capable of proceeding and obtaining a good bonding state. Therefore, cold glue such as polyvinyl acetate (PVA) or ethylene / acetic acid copolymer (EVA) emulsion can be employed.

  In the embodiment shown in FIG. 3, the PET multifilament indicated by reference numeral 8 is made of a PET multifilament and a longitudinally stretched film with a widthwise narrow stretch made of colored PP resin. If the twisted and twisted yarn is used, it is a string in which the longitudinally stretched film accompanied by the stretching in the width direction made of PP resin is converged and the outer peripheral surface is heat-sealed, and is a multifilament made of PET and colored. A core portion made of a combined yarn obtained by combining and twisting a longitudinally stretched film accompanied by a width direction narrow stretch made of PP resin is provided on the center side, and surrounds the outer periphery of the core portion and the core portion It is possible to manufacture a peripheral surface fusion string in which a portion is integrated by bonding.

  FIG. 4 illustrates an example of a process for manufacturing a peripheral surface fusion string having a structure in which an outer periphery of a core portion and a portion surrounding the core portion are integrated by heat fusion.

  When the PET multifilament 8 that has passed through the feed pipe 6 is fed into the center of the PP stretched film 10 and fed into the fusing nozzle 3 as indicated by an arrow 12, Hot air is blown out in the direction shown by the arrow 13 through the tube 7a, the central portion of the PP stretched film 10 that wraps around the peripheral surface of the PET multifilament 8 is melted, and the outer periphery of the core portion and the portion surrounding the core portion by fusion bonding Is used to manufacture a peripheral surface fusion string.

  Next, examples of the present invention will be described. However, the present invention is not limited to the above-described embodiments and examples described later, and various modifications are made within the technical scope grasped from the description of the claims. Is possible.

  The peripheral surface fusion string of the present invention was manufactured by the manufacturing apparatus and method described with reference to FIG.

  A lined PP stretched film width of 200 mm was produced in the same manner as in the production of a conventional PP peripheral surface fused string.

  Using PET fibers (10,000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg), converged PET multifilaments 8 were coated on the surface with cold glue 5.

  In FIG. 3, a PET multifilament having a cold glue 5 applied to the surface, indicated by reference numeral 9, is wrapped in the middle of a 200 mm-stretched PP stretched film with a hole diameter of 4 mmφ and a length of 50 mm. Was passed through a cylinder heated to a surface temperature of 400 ° C. at a speed of about 60 m / min.

  By passing through the heated cylinder, the surface of the PP stretched film 10 is melted, and the entire peripheral surface is fused to form a cylindrical string.

  The cylindrical string produced in this way is somewhat compressed when it is wound up by a winder so that its cross section becomes an ellipse.

  Since heat is not transmitted inside the string during molding, the strength of the PET multifilament 8 is maintained as it is.

  FIG. 5 shows an example of the cross section of the peripheral surface fusion string 20 manufactured in this embodiment and wound up by a winder and having an elliptical cross section.

  In FIG. 5, a portion indicated by reference numeral 22 is a PP stretched film constituting the inside of the cord, and is provided with a fusion layer on the surface of the cord indicated by reference numeral 21 on the outer periphery. Moreover, the part shown with the code | symbol 23 is the core part comprised with the multifilament made from PET.

  Between the two, a good bonding state is obtained by the center surface adhesive layer 24 formed by gradually drying the cold glue with time.

  When a “poly rope”, which is a converged synthetic resin string, is produced by a conventional method using a lined PP stretched film width of 200 mm used in this example, its strength is as follows.

Unit weight PP stretch film (normal poly rope) with a tensile strength of 200 mm 3.0 g / m 100 kg

  Next, when using a 200-mm lined PP stretched film width used in this example and producing a peripheral surface fused string in which the converged PP stretched film is heated and the surface is fused by a conventional method, The strength is as follows.

Unit weight Tensile strength PP fusion stretched film (prior art) 3.0g / m 60kg

  Therefore, the strength of the peripheral surface fusion string produced in this example is as follows because it is reinforced with PET fibers (10,000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg).

Unit weight Tensile strength Peripheral fused string of this example 4.5 g / m 130 kg

  The dry adhesive content is 0.5 g / m.

  In contrast to the conventional peripheral surface fusion string (thickness (flat): 5 mm, unit weight: 3.0 g / m, tensile strength: 60 kg), the peripheral surface fusion string of this example has a thickness (flat): It became 5 mm, unit weight: 4.5 g / m, and tensile strength: 130 kg, and it became a high-strength peripheral surface fusion string as compared with a conventional PP peripheral surface fusion string.

  The circumferential surface fusion string is the same as in Example 1 except that the manufacturing method is not the manufacturing method using the adhesive described in FIG. 3, but is changed to the manufacturing method without using the adhesive described using FIGS. Manufactured.

  Since the core part formed by PET fiber (10000 dtx unit weight: 1.0 / m, tensile strength: 70 kg) and the outside of the core part formed by the PP stretched film are not joined together, The bonding was weaker than that in Example 1.

  However, the same high tensile strength string as in Example 1 was obtained.

  When the cord is cut short and used, the core portion of the center formed by the PET fiber may fall off, but when used as a relatively long cord, the core portion does not fall off, I could keep the knot firmly.

  A peripheral surface fusion string was manufactured by making the PET fiber used for reinforcement twice that of Example 1.

  That is, except that the PET fiber (10000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg) used in Example 1 was changed to a PET fiber (20,000 dtx unit weight: 2.0 g / m, tensile strength: 140 kg). Produced the peripheral surface fusion string in the same manner as in Example 1.

  As described in Example 1, the peripheral surface fusion was performed by applying heat to the converged PP stretched film by the conventional method using the 200 mm wide PP stretched film width used in this example, and fusing the surface. When a string is manufactured, its strength is as follows.

Unit weight Tensile strength PP fusion stretched film (prior art) 3.0g / m 60kg

  Therefore, the strength of the peripheral surface fusion string produced in this example is as follows because it is reinforced with PET fibers (20,000 dtx unit weight: 2.0 g / m, tensile strength: 140 kg).

Unit weight Tensile strength Peripheral fused string of this example 5.0 g / m 200 kg

  The dry adhesive content is 0.5 g / m.

  In contrast to the conventional peripheral surface fusion string (thickness (flat): 5 mm, unit weight: 3.0 g / m, tensile strength: 60 kg), the peripheral surface fusion string of this example has a thickness (flat): It became 5 mm, unit weight: 5.5 g / m, and tensile strength: 200 kg, resulting in a high-strength peripheral surface fusion string as compared with the conventional PP peripheral surface fusion string.

  Instead of the PET fiber (10000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg) used in Example 1, it was colored with PET fiber (10000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg). A peripheral surface fused string is formed in the same manner as in Example 1 except that a core portion is formed by a combined yarn obtained by combining and twisting two longitudinally stretched films accompanied by a narrow width direction made of PP resin. Manufactured.

  As described in Example 1, the peripheral surface fusion was performed by applying heat to the converged PP stretched film by the conventional method using the 200 mm wide PP stretched film width used in this example, and fusing the surface. When a string is manufactured, its strength is as follows.

Unit weight Tensile strength PP fusion stretched film (prior art) 3.0g / m 60kg

  In addition, the strength of two longitudinally stretched films with widthwise narrow stretch made of colored PP resin twisted together with PET fibers (10,000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg) Is as follows.

Unit weight Tensile strength colored PP tape 2 0.8g / m 30kg

  Therefore, when the dry adhesive content is 0.5 g / m, the strength of the peripheral surface fused string produced in this example is reinforced with PET fibers (10,000 dtx unit weight: 1.0 g / m, tensile strength: 70 kg). From that, it becomes as follows.

Unit weight Tensile strength Peripheral fused cord of this example 4.8 g / m 160 kg

  In contrast to the conventional peripheral surface fusion string (thickness (flat): 5 mm, unit weight: 3.0 g / m, tensile strength: 60 kg), the peripheral surface fusion string of this example has a thickness (flat): It became 5 mm, unit weight: 5.3 g / m, and tensile strength: 160 kg, and it became a high-strength peripheral surface fusion string as compared with the conventional peripheral fusion string made of PP.

  FIG. 6 shows an example of a cross section of the peripheral surface fusion string 25 manufactured in this embodiment and wound up by a winder and having an elliptical cross section.

  The part shown by the code | symbol 26 is a part currently formed from the longitudinal direction stretched film accompanied by the width direction narrow drawing made from the colored PP resin. In the case of a cut surface, there is a portion colored in this way at the center of the string.

Since both the PP stretched film constituting the inside of the string indicated by reference numeral 22 and the core part constituted by the PET multifilament indicated by reference numeral 23 are translucent, the colored portion indicated by reference numeral 26 is Since it can be visually recognized from the outside of the surface fusion string, and a slight color can be confirmed inside the peripheral surface fusion string, it can be easily identified that the string is reinforced with PET multifilaments. I was able to.
In addition, since the core part was formed with the combined yarn obtained by combining and twisting the PET fiber and the PP narrow-width highly stretched film, the tie-in of the PET fiber and the PP tape is more entangled than in the case of Example 1. It was getting better.

  The PP circumferential surface fusion string according to the present invention is a composite string utilizing the high strength of PET fibers.

  By making use of the high strength of PET fiber, the PP peripheral surface fused cord according to the present invention is soft and easy to use such as no fluffing. Become a strong string. The PP peripheral surface fused string according to the present invention is an epoch-making product that can be used in a conventional sense because the strength is increased without increasing the thickness of the string.

  There are still many uses for hand knotting, where the conventional PP peripheral surface fusion string cannot be used due to its low strength, and it is easy to tie, difficult to unwind, and hates fluff. For example, the PP peripheral surface fused string according to the present invention is most suitable for applications such as compression packing of bulky products.

10 PP stretched film 1 Fusing device 2a, 2b Hot plate 3 Fusing nozzle 4 Adhesive container 5 Adhesive (cold glue)
6 Inlet tube 7 Hot air gun 7a Hot air tube 8 PET multifilament 9 PET multifilament 22 coated with adhesive on the surface PP stretched film 21 constituting the inner surface of the peripheral surface fusion string 21 peripheral surface fusion Fusion surface 23 of string surface Core part 24 made of PET multifilament Central surface adhesive layer 26 Colored part in the core part

Claims (3)

  A string made by converging a longitudinally stretched film made of polypropylene resin and stretched in the width direction and heat-sealing the outer peripheral surface, and has a core part on the center side, and the core part is made of polyethylene terephthalate Peripheral fusion string made of multifilament.   A string made by converging a longitudinally stretched film made of polypropylene resin and stretched in the width direction and heat-sealing the outer peripheral surface, and has a core part on the center side, and the core part is made of polyethylene terephthalate A peripheral surface fusion string made of a combined yarn obtained by combining and twisting a multifilament of the above and a longitudinally stretched film accompanied by a widthwise narrow stretch made of colored polypropylene resin.   The peripheral surface fusion string according to claim 1 or 2, wherein an outer periphery of the core portion and a portion surrounding the core portion are integrated by bonding or heat fusion.

Images