JP2016108690A - rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rope that retains characteristics of a polypropylene resin rope that has a voluminous feeling, is soft and is easy to be tied with hands and further has a higher strength compared to the conventional polypropylene resin rope.SOLUTION: The rope is produced by spinning a plurality pieces of polypropylene resin film. In the rope, fibers made of polyethylene terephthalate are used as a core or fibers made of polyethylene terephthalate are spirally wound around the rope.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rope made of synthetic resin, and more particularly to a rope in which polypropylene fiber and polyethylene terephthalate fiber are mixed and twisted.

  The history of strings used for tying, such as packaging, begins with rough ropes, ropes, etc., and it is said that the oldest in Japan has been used since about 1602. Later, in the 1950s, a machine for making a trolley was devised, and a trolley by machine production appeared.

  Since 1960, ropes have been replaced by petrochemical strings in Japan.

  In 1962, polypropylene (sometimes referred to as “PP” in this specification) was produced in Japan, and ropes that burned multiple polypropylene resin films (for example, three) rapidly spread. did.

  Many proposals have been made for strings of petrochemical products such as polypropylene. For example, there are Patent Document 1 (rope), Patent Document 2 (industrial material string), and the like.

  The film of polypropylene resin was as thin as possible, with a high volume and a soft finish.

  For this purpose, it has become standard to make a rope with a softer volume feeling by making a streak into the film, making use of the characteristics of the difference in contraction and making a film with a heel.

  In a general method of manufacturing a rope in which multiple polypropylene resin films are burned, first, the polypropylene material is put into a molding extruder and melted by applying heat, passed through a die, cooled and solidified, and crystallized to form a film. To do. At this time, the unevenness of the streaks is made at the die outlet to make a volume film. Next, the film is heated again and stretched to increase the strength and reduce the elongation. Stretching is usually 4-7 times and becomes a soft string.

  At this time, by inserting a streak during cooling after stretching, a string having a volume that is further wrinkled by a difference in contraction can be obtained.

  A plurality of (for example, three) such films are twisted together to produce soft polypropylene resin ropes.

  As a rope made of polypropylene resin in which three films are twisted together, for example, a rope having the following specifications is produced.

rope
4mm / outer diameter 10, kg / roll 400m / roll
5mm / outer diameter 10, kg / roll 300m / roll
6mm / outer diameter 1,5kg / roll 300m / roll
8mm / outer diameter 1,5kg / wind 200m / wind 10mm / outer diameter 1,5kg / wind 150m / wind

  The specifications of the original fabric width of one polypropylene resin film used for the production of the polypropylene resin rope (standard 6 mm) were as follows.

Before stretching Width: 200mm
After stretching Width: 100mm

  The films are individually twisted, and a plurality (for example, three) are twisted to form a rope.

  When twisting three pieces into a rope, the number of individual twists is, for example, 24 turns / m, twisting in the Z direction, then combining the three pieces and twisting 32 turns / m in the S direction. It has a rope shape. The number of twists is changed individually according to the thickness and use of the string.

  For example, in order to produce an 8 mm polypropylene resin rope, there are cases where the original fabric width before stretching: 400 mm, the width after stretching: 200 mm, and the basis weight (g / m) = 10 g / m.

  In addition, when twisting multiple pieces (for example, 3 pieces), depending on the application and purpose, hot air from a heater, air gun or the like is applied to the center, and the center is melted to form a fusion rope that does not fall apart. It is standard.

  Conventional polypropylene resin ropes manufactured as described above have a characteristic of being voluminous, soft and easy to tie by hand, and have been widely used.

  By the way, the strength of the conventional polypropylene resin ropes (PP ropes in which PP films are individually twisted and three are twisted) manufactured as described above is as follows in a market standard example. .

6mm 5g / m PP use Power: 100kg
8mm 10g / m PP use Power: 200kg

  That is, the current standard specifications of typical polypropylene resin ropes are as follows.

PP stretched film:
Width: 100 mm Weight: 1.67 g / m
Lower twist: 24 times / m, Upper twist: 32 times / m
A rope with an outer diameter of 6mm
Strength: 100kg / book
Weight: 5g / m
1.5kg / roll
Length: 300m / roll

In order to maintain a strength of 100 kg / piece with a conventional rope made of polypropylene resin (PP rope in which PP films are individually twisted and three are twisted), 5 g / m of PP resin is required. In addition, 10 g / m of resin is required to maintain 200 kg / strength. Therefore, the biggest problem is that the strength is low with respect to the amount of consumed resin.

  Furthermore, the elongation of about 40% was also a problem with conventional polypropylene resin ropes.

  On the other hand, there is a remarkable spread of polyethylene terephthalate resin, which has been remarkably developed in recent years. Hereinafter, polyethylene terephthalate may be referred to as “PET”.

  For example, today, the demand for PET bottles is enormous. Furthermore, the spread of fibers using this PET bottle is also remarkable.

  The following are standard fiber physical properties that reuse PET bottles.

Characteristics Positive fineness Dry strength Dry elongation Unit (dtex) (N) (%)
Numerical value 1678 135.1 13

  When three fine fibers having such physical properties are used as one twisted piece, the following is converted.

Weight: 0.5g / m Strength: 41.4kg / stretch Elongation: 18%

  A comparison between the strength of the PP rope described above and the strength of using the above-described three PET fibers reused as a single twisted fiber is as follows.

Strength comparison PP rope: 100 g / m at 5 g / m PET fiber: 414 kg / m at 5 g / m

  That is, the strength in the case of using three fibers recycled from the above-described PET bottles as one twist is four times stronger than the conventional PP rope.

  As described above, when using a fiber recycled from a PET bottle, the strength becomes very strong. On the other hand, when a PET bottle is used as a rope with recycled fiber, it is fibrous and very thin. It becomes practically impossible to tie with.

JP-A-7-54285 JP 2001-58146 A

  The present invention provides a high-strength rope compared to conventional polypropylene resin ropes while maintaining the characteristics of a polypropylene resin rope that is voluminous and soft and easy to tie by hand. Is aimed at.

  A rope manufactured by burning a plurality of polypropylene resin films, wherein a polyethylene terephthalate fiber is used for the core, or a polyethylene terephthalate fiber is spirally wound around the rope. It is a rope.

  Here, the number of polyethylene terephthalate fibers used for the core and the number of polyethylene terephthalate fibers wound around in a spiral shape can be adjusted according to the strength level required for the rope to be produced.

  For example, without using polyethylene terephthalate fiber, the polyethylene terephthalate fiber used for the core is at least twice as strong as the rope produced by simply burning a plurality of polypropylene resin films. The number and the number of polyethylene terephthalate fibers wound around the periphery can be selected.

  In addition, the number of polypropylene resin films used can be adjusted in consideration of the fact that the produced rope retains the characteristics of a volumetric, soft, easy-to-knot polypropylene resin rope. it can.

  According to the present invention, while maintaining the characteristics of a polypropylene resin rope that is voluminous and soft and easy to tie by hand, a high-strength rope is provided as compared to conventional polypropylene resin ropes. can do.

It is a schematic perspective view explaining an example of the manufacturing process of the rope by which the fiber made from a polyethylene terephthalate is used for the center core based on one Embodiment of this invention. It is a schematic perspective view explaining an example of the manufacturing process of the rope by which the polyethylene-terephthalate fiber based on one Embodiment of this invention is helically wound around the circumference | surroundings.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not restricted to the following Example, In the technical range grasped | ascertained from description of a claim, it can change variously.

  In the same manner as the production of a conventional polypropylene rope, a polypropylene film having the following standards was prepared, and this was heated and stretched in the same manner as in the past to form a polypropylene string.

PP stretched film Width: 60mm
Weight per unit: 1.0 g / m

  When three strands of polypropylene (polypropylene film) are twisted to form a rope, the strength is as follows.

Three twisted yarn Using PP of 3g / m, strength: 60kg / m

  On the other hand, the PET fiber which reused the PET bottle which has the following physical properties was prepared.

Characteristics Positive fineness Dry strength Dry elongation Unit (dtex) (N) (%)
Numerical value 1678 135.1 13

  In the case of using three PET fibers and one twisted one, the strength is as follows when converted.

Weight: 0.5g / m Strength: 41.4kg / stretch Elongation: 18%

  The rope of this embodiment is obtained by twisting together three polypropylene strings (polypropylene film) prepared as described above and four PET fibers prepared as described above into one strand. Manufactured.

  In this case, as shown in FIG. 1, a rope in which the PET fiber is used for the core can be manufactured, and as shown in FIG. 2, the PET fiber is wound around in a spiral shape. It is also possible to produce ropes that are used.

  In the embodiment shown in FIG. 1, the three PP strings (PP films) 8, 9, and 10 prepared as described above are twisted in a spiral shape, and four PET fibers prepared as described above are twisted. The combined PET fibers 11 come into the center of the rope 12.

  In the embodiment shown in FIG. 2, the three PP strings (PP films) 8, 9, 10 prepared as described above and the four PET fibers prepared as described above are twisted into one. The PET fiber 11 is twisted spirally to form a rope 13.

  In the embodiment shown in FIGS. 1 and 2, the hot air indicated by an arrow 7 is applied to the center from the hot air outlet 6 a through the hot air pipe 6, and the center is melted to form a loose fused rope. Yes.

  When manufacturing a rope in which PET fiber is used for the core, as in the embodiment shown in FIG. 1, PP can be partially melted by applying heat to the center during mixed twisting, This is advantageous because PET fibers can be brought into close contact with PP.

  The ropes 12 and 13 manufactured in this way had the characteristics of a PP resin rope that had a sense of volume and was easily knotted by hand.

  The strength of the rope 12 and the rope 13 of this embodiment manufactured in this way is as follows.

Strength with 4 PET fibers: 166 kg / line (Strength: 41.4 kg / line x 4 lines = 166 kg / line)

3 PP film with 3g / m and strong: 60kg / m
In addition, the strength is 226kg / book.

  In this way, a high-strength rope can be obtained.

  On the other hand, the basis weight of the manufactured rope 12 and rope 13 of the present embodiment is as follows.

  Weight per PET fiber: 0.5 × 4 = 2g / m

So overall,
2 g / m (PET) +3.0 g / m (PP) = 5 g / m
Further, the product is 300 m / roll, and the weight is 1.5 kg / roll.

  Therefore, compared to conventional PP-only ropes, high-strength products can be obtained with exactly the same weight and price, but only twice as strong.

  This is the same as in Example 1, except that the standard of the PP stretched film was changed as follows, and seven of the three PET fibers used in Example 1 were twisted into one. Example ropes were manufactured.

Three twisted PP stretched films 2. Uses three PP of 17.17 g / m, strength: 130 kg / m
Weight: 6.5 g / m

The strength of the seven PET fibers used in Example 1 that were twisted into three to make one:
7 x 41.4kg = 290kg
Weight: 3.5g / m

  Since the strength of the rope manufactured in this example is the sum of both, the weight is 10 g / m and the strength is 420 kg / piece.

  In the case of three twisted yarns of PP stretched film, the strength is 200 kg / piece even when converted to a weight of 10 g / m.

  Therefore, compared to the case of three twisted yarns, the PP stretched film is a high strength product that is twice or more.

  Incidentally, the rope manufactured in this example also had the characteristics of a PP resin rope having a sense of volume and being easily knotted by hand.

  According to the present invention, by blending PP film and PET fiber, the advantages of polypropylene resin and polyethylene terephthalate resin are combined, and the volume of the PP rope is soft and can be easily tied by hand. Furthermore, while maintaining the characteristics, it is possible to easily produce a rope having more than twice the strength of the conventional one.

  That is, the thickness, texture, and ease of knotting of the conventional PP rope can be maintained, and the strength can be greatly increased with the PET fibers that are mixed and twisted.

  When the fiber product using the recycled PET resin is converted considering that the specific gravity is 0.90 to 0.91 for PP and 1.34 to 1.39 for PET, the price of the rope according to the present invention Can be provided at the same price or at a lower cost compared to conventional PP ropes. Also in this aspect, the present invention is epoch-making.

  The present invention is also valuable from the viewpoint of recycling of PET resin products and PET bottles.

  Furthermore, PP has weakness against ultraviolet rays, but PET is strong, so that the rope according to the present invention can withstand outdoor use for a long time.

6 Hot air pipe 6a Hot air outlet 8, 9, 10 PP string (PP film)
11 PET fiber 12 Rope 13 Rope

Claims (2)

  A rope manufactured by burning a plurality of polypropylene resin films, wherein a rope made of polyethylene terephthalate is used as a core.   A rope produced by burning a plurality of polypropylene resin films, wherein a polyethylene terephthalate fiber is spirally wound around the rope.

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