JPH10264945A - String for handle of tote bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a string for a handle of a high-grade tote bag which is excellent in the tensile strength and the fitting strength, has the diversified color fastness and the clear-cut high-grade sense, excellent in the mechanical aptitude in bending and forming a handle, and capable of efficiently and economically being manufactured. SOLUTION: In a composite string where the surface of a core is covered with a covering material, a core 1 is formed by converging, stranding and fixing paper tapes 12 with the number of strands of 10-20 T/30 cm, a thin-walled plastic cover layer 3 of approximately uniform thickness (t) of 0.3-1.1 mm is closely covered on the whole surface of the core 2, and the circularity expressed by the ratio of the minimum value of the diameter (D) to the maximum value (minimum value/maximum value) is >=0.8, the diameter is 3-7 mm, and the ratio of the thickness (t) of the cover layer 3 to the diameter (D) of the string (t/D×100) is 4.2-16%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string used for gripping a handbag. For more details, for example,
When purchasing products such as precious metals, cosmetics, clothing, etc. at specialty stores, etc., a string used as a handle for a high-grade handbag, such as a paper bag that is put into the product and passed to the customer, and a handbag using this string It relates to a handle and a carrying bag.

[0002]

2. Description of the Related Art Conventionally, as a string used as a handle of a general carrying bag, for example, a fiber rope formed by twisting fibers such as hemp into a rope, or a paper made by twisting paper into a rope is used. Rope, resin rope formed by twisting resin sheets such as polypropylene, rope knitting rope of various fibers, flat knitting tape of various fibers, paper folded flat cord, resin hand-held molding with integrated mounting parts with sandwiches at both ends of the handle Goods, etc.

As shown in FIG. 5, for example, as shown in FIG. 5, a string 1 for a handle as described above is alternately curved on a reinforcing paper (adhesive pressing paper) 5 on the left and right sides of the reinforcing paper 5. An adhesive is applied to the periphery of the string 1 and another reinforcing paper 5 is further stuck thereon, and then pressed from above by a pressing means such as a pressing roller. After fixing the intermediate portions of the curved portions of the string 1 protruding left and right of the reinforcing paper 5 between the upper and lower two reinforcing papers 5 in a state where the curved portions of the string 1 alternately protrude, By cutting the reinforcing papers 5, 5 and the string 1 together at the portion indicated by the two-dot chain line in the figure, both ends of the string 1 curved at the middle part are two reinforcing papers 5,
Then, the handle 6 fixed in a state of being sandwiched between the five is manufactured. As shown in FIG. 6, the handle 6 is fixed to the opening edge of the bag 7 by applying an adhesive 8 to one outer surface of the reinforcing paper 5 of the handle 6 or by using an adhesive such as a double-sided tape. And carrying bag 9
Is manufactured.

[0004] The characteristics required as a handle string of such a carrying bag include the following various items. (A) Abundant color alignment: Target colors (including light and dark colors) can be prepared relatively easily. (B) Water resistance strength: Use can be continued in a state of being wet with water. (C) Color transfer resistance: Do not easily transfer color to clothes. (D) Photo-discoloration resistance: The initial coloring can be maintained for a long time. (E) Soft touch feeling: easy to hold and hands are not painful. (F) Abrasion resistance: Able to be used for a long time without slippage. (G) Overall strength of the bag: The bag must have enough strength to withstand practical use, including the mounting strength of the handle. (H) String shape retention: The initially formed curved handle shape can be maintained for a long period of time. (I) Mechanical suitability of handle attachment: The ability to automatically and continuously attach a string to reinforcing paper using an existing handle manufacturing machine. (J) Independence of the handle: The shape of the curved handle does not tilt or fall.

[0005] However, when looking at the points (a) to (j) of the conventional handbag handle string, as shown in Table 1 below, the conventional various handle strings are required as the handle string. None of the above (a) to (j) can satisfy all the characteristics.

[0006]

[Table 1]

[0007] As a recent trend of handbags, bipolarization into regular products of high practicality and high-grade products is progressing.
In this case, the carrying bag as a luxury item is, for example, a paper bag to be put into a product and given to a customer when jewelry, precious metal, cosmetics, clothing, and the like are purchased at a specialty store. These handbags themselves serve as the exterior of the product, which differentiates the luxury of the purchased product from the customer, as a proof of the purchase of a luxury product at a specialty store. It fulfills the role of satisfying the desire to reveal. In addition, these high-quality handbags are used as an advertising medium that symbolizes product brands and sales brands with the design itself of the entire bag, and because carrying this kind of bag is one fashion, Distribution and sale can also be done arbitrarily. In this case, the carrying bag is luxurious and expensive, but unlike the current disposable carrying bag, which can only be turned into trash or garbage bags after taking home, it can be used repeatedly instead of the bag. Rather, it is in line with the recent consumer orientation, which emphasizes the effective use of resources and environmental protection, and is becoming one of the trends in the future.

Therefore, the functions required of these high-grade handbags are not limited to the practical functions as simple handbags, but also, for example, the appearance of the bag and the appearance of the bag surface (there may be product brands). , The aesthetic harmony between the design applied to the bag and the handle string, the high-quality appearance of the handle surface appearance and the shape of the handle, the ease of putting on the handle, the ease of passing through the arm, and the touch of the hand The soft touch and other functions are also important. In other words, in a high-end handbag,
The role of the handbag as a handle is emphasized. For example, particularly in the case of a woman in particular, since it is often carried through an arm, it is necessary for the handle to be independent so that it can be easily passed through the arm. Further, in order to pass the handle through the arm, the handle 6 is not merely a conventional U-shape, but, for example, as shown in FIG. 7, the handle 6 swells completely and the base end attached to the bag 7 is slightly narrowed. A so-called horseshoe is suitable. Therefore, the string is not twisted when it is bent into a horseshoe shape and attached to the bag as described above, and furthermore, for example, as shown in FIG. If they are different, the sense of quality is impaired. Therefore, it is also required that the shape of the set of handles 6, 6 is uniform. For this reason, a characteristic that can be manufactured with reproducibility in a previously designed target curved shape is required for a handle string.

In view of the above, as a handle string for a high-end handbag, considering that the handle itself is a major part of the overall design of the bag as described above, polyethylene or polypropylene is used for the purpose of providing the required quality. A string made of a synthetic resin such as polyolefin has been developed and is commercially available. Table 2 shows the characteristics of the high-end product-oriented handbag handle string currently on the market.

[0010]

[Table 2]

The method of measuring the characteristic values shown in Table 2 is as follows. Cross section of string: Cut with a sharp rotating blade in a state where the cross section of the string is not deformed.
The diameter is measured at eight points at 45 ° intervals in the circumferential direction at one location in the length direction, and the diameter is measured at n = 10 for one meter length, and the average value is determined. String weight: Cut the string with a sharp knife to a test length of 1 m in the length direction, and weigh the weight with an electronic balance (minimum scale: 1/100 g)
Measure with Tensile strength: In accordance with JIS Z1533 (flat yarn for polyolefin cloth), gripping distance 10c
m at a tensile speed of 30 cm / min. Bending stress: Load (F), load length (L), and string diameter (d) applied to a load point when performing a bending test in accordance with JIS P8125 (a stiffness test method using a Taber stiffness tester for paperboard) ) Is calculated by the following (Equation 1). Bending stress (σ _b ) = (32 × F × L) / (π × d ³ ) (Equation 1)

[0012]

Among these, the cord of the commercially available product A having a perfect circular cross section has been popular because it succeeded in giving the handle a neat and high-quality feeling in combination with the independence. It is presumed that the aim of the hollow structure is to suppress an increase in bending stress generated in the resin round cord. However, as is clear from Table 2, the hollow structure has a remarkable decrease in tensile strength beyond the effect of suppressing bending stress, resulting in insufficient handle strength. Furthermore, the biggest drawback of this hollow cord is that since the cross section is a perfect circle, the contact area between the bag and the cord is small when it is mechanically attached to the carrying bag as a handle. This is at a low level, and the drawback of the perfect circular resin cord is directly generated. Therefore, at present, in the case of this hollow string, the attachment of the handle to the bag was performed by hand application, the length of the string to be provided to the joint to the bag was long, and the slope was slightly inward from the vertical line. It is designed to be a joint. However, the low levels of tensile strength and attachment strength to the bag are incomparable, and in fact the fact is that it is only used in small handbags for lightweight contents. That is, this hollow resin string has no mechanical suitability for an automatic continuous handle manufacturing machine, and has been evaluated in the market as a handle string for a small bag having only a low level of strength.

On the other hand, the cord of the commercial product B having an elliptical cross-section and the cord of the commercial product C having a flat elliptical cross-section are retained without impairing the neat luxury feeling of a perfect circular shape in combination with the independence. The intention of making the cross section of the string such an elliptical shape or a flat elliptical shape is to improve the contact with the adhesive holding paper (reinforcement paper) when attached to the carrying bag, that is, to increase the adhesive area, It is estimated that the aim was to improve the mounting strength of the handle to the bag.

By the way, as a conventional handle manufacturing machine, for example, one having a structure as shown in FIG. 9 is generally used. The handle manufacturing machine 30 is provided with a handle string 1 which is supplied to the manufacturing machine 30 and travels forward on the machine body. Also, after being alternately pulled to the left and right by the plurality of string winding portions 31a and 31b movably disposed to the left and right to be continuously curved and formed, the intermediate portion of the string 1 which is alternately curved to the left and right is formed. The reinforcing paper 5 is continuously supplied from above and below, and an adhesive is applied around the string 1 sandwiched between the reinforcing papers 5, 5.
By pressing with 2 or the like, the string 1 continuously curved
The middle part of the left and right curved parts in
Then, the reinforcing papers 5, 5 and the cord 1 are cut by the slitter 33 at a central portion in the traveling direction of the reinforcing paper 5 and separated into right and left, so that the cord 1 cut to a predetermined length is cut.
Are curved at the middle and both ends are reinforcing paper 5,
A plurality of handles fixed at 5 are lined up in a row and are continuously manufactured. Many handles manufactured in this connected state are supplied to a bag making machine (not shown) and are separated from each other during bag making.

Although the above-mentioned resin cords of the commercially available products B and C having the elliptical cross section or the flat elliptical cross section seem to be aimed at improving the bonding strength to the bag, the cross section is actually elliptical. Because of this, it is recognized in the market that there is no machine suitability for the above-described existing handle making machine, either because of the occurrence of directionality and the high bending stress.
Commercially available products B and C of such resin cords having an elliptical cross-section
There is also a handle machine manufactured with a handle making machine, but this is a special handle making machine that is an improvement on the existing handle making machine as described above, and the main remodeling points are, for example,
To make the direction of the string cross section of the running string along the bonding surface,
Addition of string running guide, installation of string twisting device, installation of string running control device to match twist timing,
It is a corona discharge treatment device or the like to the surface of the string for increasing the adhesive strength. Moreover, the production capacity of this special handle making machine is less than about half that of a normal handle making machine.

In the present invention, in consideration of the current state of the high-grade hand-held straps currently on the market as described above, high-quality handbags are used as handle strings such as tensile strength and attachment strength to the bags. In addition to its original characteristics, it has a neat and high-quality feel as a high-end product, and has the mechanical aptitude that it can be efficiently manufactured using existing handle manufacturing machines when forming curved handles. An object of the present invention is to provide a handle string for a handbag that can be manufactured economically.

[0017]

In order to achieve the above object, the handle string of the carrying bag according to the present invention is a composite string in which the surface of a core material is covered with a coating material, and the core material is a paper tape. Is converged and twisted, and on the entire surface of the core material,
The core material is closely covered with a thin synthetic resin coating layer, and the circularity indicated by the ratio of the minimum value to the maximum value of the diameter (minimum value / maximum value) is 0.8 or more. Features.

Thus, the handle string according to claim 1 is
As shown in FIG. 1 and FIG. 2, since the core string 2 is obtained by converging and twisting and fixing a paper tape 12, and the entire surface thereof is closely covered with a thin resin coating layer 3, the paper core sheet 2 , The tensile strength is large, the thickness t of the resin coating layer 3 on the surface is small, and the bending stress is small. For this reason, when forming a handle by bending using an existing handle manufacturing machine, the string does not come off the string winding portion of the machine, the string running at the time of manufacture is not cut or twisted,
It has excellent mechanical suitability and can be efficiently and economically manufactured using existing handle manufacturing machines. In addition, since the thickness of the surface resin layer 3 is thin and the string is flexible, the string is deformed flat by pressing by a roll or the like at the time of adhering to the reinforcing paper or the bag, and the bonding area is increased. The bonding strength with the reinforcing paper is also sufficient. Furthermore, since the resin coating layer 3 on the surface is thin,
The touch is soft, and the amount of resin material used is small and economical. Also, this cord 1 has a high roundness of the cross section,
In addition, since the surface is covered with the coating layer 3 of synthetic resin, not only the appearance quality when the handle is the handle of the handbag, but also the waterproofness, the processing accuracy is high, and the same shape of the string can be continuously used. In addition to being able to consistently supply a string of constant quality, it is possible to produce a variety of colors because it is a synthetic resin, and has excellent color fastness without discoloration or color transfer. It is also possible to process such as polishing and matting of paper, and the characteristics of paper string such as large tensile strength, flexibility and low bending stress, and synthetic resin string such as appearance quality and various robustness This is a composite string having a synergistic effect due to both of these characteristics.

In the string 1 according to the present invention as described above, it is preferable that the resin coating layer 3 on the surface is as thin as possible in terms of bending stress, flexibility, and economy of the string 1, while the thickness of the resin coating layer 3 is small. If the thickness is too small, there is a problem in durability and the like. Therefore, the thickness t of the resin coating layer 3 needs to be at least 0.3 mm, and the diameter D of the string 1 is 3 to 7 m.
The range of m is a preferable range for a handle string of a carrying bag, and even in the case of a string having a diameter D of 7 mm, the wall thickness is 1.1 m.
m, it is sufficient that the thickness t of the coating layer 3 is 0.1 mm.
The thickness is preferably in the range of 3 to 1.1 mm.
The ratio of [(t / D) × 100] to the diameter D of the string 1 is 4.
The range of 2 to 16% is a preferable range (claim 2).

On the other hand, if the number of twists of the core material 2 is small, untwisting tends to occur, it is difficult to maintain a perfect circular shape, and the tensile strength also decreases.
On the other hand, if the number of twists is too large, the entire string 1 is twisted, and the linearity of the string is lost. For this reason, the number of twists of the core material 2 is 10 to 20.
A range of T / 30 cm is preferable (claim 3).

Furthermore, if the degree of close contact between the core material 2 and the coating layer 3 on the surface is small, when the core material 2 is attached to the bag as a handle, force is applied only to the coating layer 3 on the surface of the string 1 directly adhered to the bag. As a result, the tensile strength of the core material 2 is not sufficiently reflected in the strength of the entire cord 1, and the handle strength is reduced. For this reason, in the handle string 1 according to the present invention, it is important that the core material 2 and the coating layer 3 are in close contact with each other.
It is preferably less than gf (claim 4). The degree of close contact between the core material 2 and the coating layer 3 is represented by the drawing strength measured by the following measurement method. Pull strength measurement method:
Using the apparatus shown in FIG. 14, one of the chucks grips only the coating layer, and the other chuck grips only the core material.
The maximum load [kgf] at the time of pulling at 0 cm and a pulling speed of 50 cm / min is measured.

Further, it is also important to have a tensile strength required as a handle string of the carrying bag, and the tensile strength of the string should be 40 kgf or more and less than 55 kgf as measured according to JIS Z1533. Preferred (claim 5).

It is also necessary that the bag should be self-supporting as a handle and easy to bend so as to be suitable for bending by a machine. For this reason, in the handle string according to the present invention, JIS
From the load (F), load length (L), and string diameter (d) applied to the load point when performing a bending test in accordance with P8125 (a stiffness test method using a Taber stiffness tester for paperboard), The bending stress calculated by this method is 80 to
It is preferably 120 (kgf / cm ² ). Bending stress (σ _b ) = (32 × F × L) / (π × d ³ ) (Equation 1)

As the synthetic resin constituting the resin coating layer 3 of the handle string 1 according to the present invention, flexibility to realize low bending stress, easiness of various coloring, adhesiveness to a bag, and various durability In terms of properties, hardness, and the like, a polyolefin resin is preferable (claim 7), and a mixed resin of an ethylene resin and a propylene resin is more preferable (claim 8).

Further, the handle string 1 according to the present invention as described above.
Is cut into a predetermined length, curved at an intermediate portion, and both ends are fixed to the reinforcing paper 5 in a state of being spaced apart from each other. The string 1 having excellent mechanical suitability can be efficiently and economically manufactured using an existing handle manufacturing machine as shown in FIG. And by attaching this to the opening edge of the bag to make a handbag, in addition to the characteristics required as a handle such as the tensile strength of the string, the strength of attachment to the bag, it is possible to make a handbag with a neat and high-class feeling (Claim 9).

Accordingly, a hand bag 9 having the handle 6 fixedly attached to the opening edge of the bag 7 at the reinforcing paper 5 portion.
(FIG. 4) is a high-grade handbag having a sufficient handle strength and a neat and high-quality feeling as a whole (Claim 10).

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the handle string of a handbag according to the present invention will be described in more detail. For convenience of explanation, the contents of the handle string of the handbag according to the present invention will be described first from the manufacturing method. Will be described. This manufacturing method is a novel manufacturing method that has led to the first realization of the handle string of the present invention.

That is, the handle string according to the present invention can be provided by a paper sheet slitting step shown in FIG. 10, a paper tape humidifying step shown in FIG. 11, a paper tape converging / twist fixing step shown in FIG.
Further, it can be manufactured by a series of steps including an extrusion coating step with a resin shown in FIG.

Next, each of these manufacturing steps will be described step by step. First, the slitting step of the paper web shown in FIG. 10 is a step for obtaining a paper tape having a width suitable for manufacturing the core material by the subsequent convergence and twisting step. Is slit by a slitter 11 or the like to form a paper tape 12 having a width capable of obtaining a core material corresponding to the thickness of a string to be manufactured, and wound into a roll 12A. As the raw material of the paper tape, the basis weight is 30 to 50.
g / m ² , which is slit into a width of about 50 to 150 mm, depending on the thickness of the core material, that is, the thickness of the string to be produced, and about 70 to 130 mm. More preferred.

Next, the humidifying step of the paper tape shown in FIG. 11 is to give the paper tape 12 plasticity for converging and twisting in the next step by giving moisture to the paper tape 12. After the paper tape 12 fed from the roll 12A is made to contain sufficient moisture (water content about 20%) by humidifying means 13 such as a spray humidifier, the moisture control section 14 controls the moisture content (water content about 11 to 11). 1
2%), the water-containing paper tape 12 'is wound up again in the form of a roll 12'A. As the humidity control unit 14, the moisture content may be simply adjusted while passing the humidified paper tape 12 'between a number of rolls, or the humidity control unit 14 may be covered with a cover or the like. A humidity control means may be provided. The moisture control in the humidity control unit 14 is performed by removing excess moisture contained in the humidified paper tape 12 ′ or by making the moisture content uniform throughout the paper tape 12 ′.
This is performed in order to eliminate a variation in strength of the humidified paper tape 12 ′ and to prevent paper breakage.

Further, the convergence and twist fixing step of the paper tape shown in FIG. 12 is a step for obtaining the paper core as a core material by converging and twisting the humidified paper tape 12 '. Here, the roll 12′A that has taken up the paper tape 12 ′ that has been plasticized by humidification is unwound from the roll 12′A while rotating, and the humidified paper tape 12 ′ is converged and twisted. The diameter of the paper core 16 obtained by passing through the die 15 is made uniform, the surface thereof is smoothed, and the roundness is enhanced. The number of twists applied to the humidified paper tape 12 'is adjusted by the feeding speed of the humidified paper tape 12' from the roll 12'A and the rotation speed of the feeding roll 12'A.

In the present invention, the humidified paper tape 12 '
Converge one sheet as shown in the figure or multiple sheets if necessary,
Twist to form a core material. The term "convergence" as used herein means that one or more paper tapes are gathered in the width direction,
In addition, it means that the width of the humidified paper tape 12 'is reduced and put together. In this case, the number of twists is preferably in the range of 10 to 20 T / 30 cm from the viewpoints of bending stress, tensile strength, surface smoothness, and linearity of the string. In other words, by setting the number of twists of the humidified paper tape 12 ′ within this range, both low bending stress suitable for forming a handle by bending the string and tensile strength required for the handle string are achieved. Satisfactory, high roundness, smooth surface, and linear strings can be obtained. If the number of twists is less than this range, untwisting tends to occur, it is difficult to maintain a perfect circular shape, and the tensile strength decreases. On the other hand, when the number of twists is larger than this range, the entire string is twisted and the linearity of the string is lost, which is not preferable.

The paper core 12 obtained by converging and twisting the humidified paper tape 12 ′ as described above and passing it through the die 15.
6 is then sent to a humidity control / drying unit 17. In the humidity control / drying unit 17, the humidified paper core 16 is dried to temporarily fix the convergence / twist. This paper core 1
6 is the core material 2 of the string 1 shown in FIG. 1 and FIG. 2, and this core material 2 converges in the humidified state of the paper tape 12 ′ as described above, and imparts an appropriate twist. Dice 1
By passing through 5 to form a string, as shown in FIG.
A large number of vertical wrinkles are gathered together in the longitudinal direction.
No. 2 has high roundness which is highly converged and twisted and fixed. Further, as described above, the convergence / twist fixing of the paper tape 12 is based on humidification, that is, plasticization of the paper by water and shrinkage of the paper due to drying. Therefore, no special glue or the like is used. There is no possibility that the influence of the sizing agent or the like occurs in the extrusion coating step with the synthetic resin. The humidity control / drying unit 17 may be configured such that the moisture is adjusted while the humidified paper core 16 is passed between a number of rolls. Or the like, and a humidity control / drying means may be provided. Then, as described above, the paper core 16 as the core material temporarily fixed by the paper shrinking by drying is temporarily
Take up in 6A shape. When winding the paper string 16, it is desirable to use a drum as large as possible and make it parallel wound to prevent curling and damage to the string.

In the extrusion coating step shown in FIG. 13, the entire surface of the paper core 16 as the core material obtained as described above is coated with a synthetic resin to form a plastic layer by humidification of the paper. In order to replace the convergence / twist state of the paper core 16 temporarily fixed by shrinkage by drying and drying with fixing by the synthetic resin coating layer, and also to convert the string surface to synthetic resin to obtain the handle string 1 according to the present invention. This is the final step. Here, the paper core 16 fed from the roll 16A is supplied to a die 19 of an extruder through a preheating furnace 18 and is extruded together with the synthetic resin, so that the coating layer of the synthetic resin is in close contact with the entire surface of the paper core 16. The coated and composite string 1 is obtained. At this time, the paper core 16 supplied to the die 19 is
In a state where the contaminant gas is removed by further degassing, the surface is densely coated with the synthetic resin by extrusion.

By the extrusion coating as described above, the thickness t of the resin coating layer 3 in the string 1 becomes thin and almost uniform, but the thickness t of the resin coating layer 3 is Tensile strength, bending stress reduction to enable efficient machining when forming a handle by bending the string 1, surface smoothness of the string to improve appearance quality, and string production Is a factor that affects the economic efficiency of the cord, that is, the production cost of the string. That is, as the thickness t of the resin coating layer 3 increases, the tensile strength and the surface smoothness of the string 1 improve,
On the other hand, not only the bending stress is increased and the bending workability at the time of forming the handle is reduced, so that the machine suitability is reduced, but also the cost is increased due to the increased amount of resin used. Therefore, the thickness t of the resin coating layer 3 must be determined as thin as possible in consideration of the balance between the tensile strength, the bending stress, the surface smoothness, the production cost of the string, and the like.
However, on the other hand, if the thickness of the coating layer 3 is too thin, there is a problem in durability and the like. Therefore, it is preferable that the thickness of the coating layer 3 be 0.3 mm or more. In addition, the thickness of the string suitable as a handle string in the handbag targeted by the present invention is important in terms of the appearance when the bag is gripped, the handleability when holding it by hand or passing it through the arm, and the like. Considering
It is appropriate that the diameter D of the string 1 is generally about 3 to 7 mm, and even in the case of a string having a diameter D of 7 mm, the thickness of the string may be about 1.1 mm. For this reason, the thickness t of the coating layer 3 is preferably in the range of 0.3 to 1.1 mm, and the ratio of the thickness t of the coating layer 3 to the diameter D of the cord 1 [(t
/ D) × 100] is preferably in the range of 4.2 to 16%, and the thickness t of the resin coating layer 3 is 0.45 to
A range of 0.8 mm is more preferable. Wall thickness t of coating layer 3
Is within the above range, the bending stress, which is an index of the bendability of the string in the present invention, is 80 to 120 (kgf /
cm ² ).

The roundness of the string 1 is preferably 0.8 or more, more preferably 0.9 or more. As the roundness of the string 1 increases, the variation in the thickness t of the resin coating layer 3 also decreases, and the thickness of the coating layer 3 can be reduced. As a result, the thickness of the resin coating layer 3 can be reduced. The thickness t is small, the bending strength can be made lower, and the appearance quality can be improved by increasing the roundness.

Next, as described above, the paper cord 16 as the core material is used.
The string 1 having a resin coating layer formed on the surface thereof and extruded from the die 19 is rapidly cooled in a cooling water tank 21, sent to a slow cooling unit 23 via a take-off roll 22, aged, and then rolled. It is wound up in a 1A shape.

In the extrusion coating step with the synthetic resin, the extrusion speed of the resin from the nozzle 19a of the die 19
Draft ratio expressed as a ratio to the take-up speed of the string 1 by the take-up roll 22, the roll 16A of the paper core 16 and the take-up roll 22
And rapid cooling of the string 1 after resin coating and slow cooling aging are important.

The tension between the roll 16A of the paper core 16 and the take-up roll 22 is adjusted by the roll 16 of the paper core 16.
This is performed by linking A and the take-up roll 22 with the linking device 35. When the feeding speed of the paper core 16 from the roll 16A increases, the intermediate roll 34 of the step roll 34 becomes larger.
a falls, so in such a case roll 1
Adjust the tension by applying the brake to the rotation of 6A.
The tension is adjusted by performing extrusion coating with resin from the die 19 of the extruder while maintaining the linearity of the paper core 16, thereby increasing the roundness of the obtained string 1 and increasing the resin coating layer 3.
It is important to prevent unevenness in the thickness of the wall.

Further, rapid cooling by the cooling water tank 21 and slow cooling aging in the slow cooling section 23 are important from the viewpoint of securing the tensile strength of the string 1 and forming crystals of the coated synthetic resin and fixing the same. It is effective in preventing the curl of the string 1 wound with resin coating. In this case as well, it is desirable to use a drum having a large diameter as a winding drum to prevent the cord 1 from being curled.

Further, the draft ratio in the extrusion coating step affects the pull-out strength between the resin coating layer 3 and the core material 2 in the string 1, that is, the degree of close contact between the two. In the case of 1, the degree of close contact between the resin coating layer 3 and the core material 2 is important in terms of strength as a handle string. That is, in general, the strength of the handle attached to the bag is determined by cutting off the handle string and the handle attachment portion of the bag body at the same time, as shown in FIG.
Using a device as shown in (1), a handle string portion is gripped on one chuck, and a bag body and a reinforcing paper with a handle are gripped on the other chuck at the same time. Measure the maximum load (kgf) when pulled with. Therefore, in this case, the handle strength of the carrying bag is generally determined by the smaller of the tensile strength of the handle string itself and the joining strength of the handle string to the bag or reinforcing paper. However, in the case of the handle string 1 according to the present invention, since the string has a composite structure composed of the core material 2 and the resin coating layer 3 on the surface thereof, the handle mounting strength is the third in addition to the above. The element, that is, the pull-out strength between the core material 2 and the resin coating layer 3, that is, the closeness between the core material 2 and the resin coating layer 3 is added, and this is the third element.
When the pull-out strength is low, the tensile strength of only the resin coating layer 3 becomes the mounting strength. From such a viewpoint, the preferable degree of close contact between the core material 2 and the coating layer 3 in the handle string of the present invention is as follows when the device shown in FIG. 14 is used, and the device is pulled at a grip interval of 20 cm and a pulling speed of 50 cm / min. The maximum load [kgf] of the core material 2 and the coating layer 3 indicated by the pullout strength measured is 5 kgf or more and 15 kF or more.
A range of less than gf is preferred. If the degree of closeness between the two is lower than this, the strength as a string and the shape retention when a handle is used cannot be secured.

Then, the core material 2 (paper core 1)
The degree of close contact between 6) and the resin coating layer 3 is represented by the ratio of the extrusion speed of the resin from the nozzle 19a of the die 19 to the take-up speed of the string 1 in the extrusion coating step with the synthetic resin, as shown in FIG.
That is, it depends on the draft ratio in the extrusion coating (string take-up speed / resin extrusion speed). The relationship between the draft ratio and the pull-out strength (closeness) between the core material and the coating layer was examined. The results are shown in Table 3, and the results are graphed in FIG.
It was shown to.

[0043]

[Table 3]

As is apparent from FIG. 16, the extrusion is performed by setting a large draft ratio at the time of extrusion coating.
The degree of close contact between the core material 2 and the resin coating layer 3 on the surface thereof increases,
The pullout strength is improved. From such a viewpoint, the draft ratio at the time of extrusion coating is preferably set to a high value of about 3 or more. The draft ratio at the time of extrusion coating with the resin is set by adjusting the extrusion speed of the resin by changing the diameter of the nozzle 19a of the die 19 of the extrusion device, or by adjusting the take-up speed of the string 1 by the take-up roll 22. Is done.

In the extrusion coating step, the synthetic resin material for coating the surface of the paper core 16 as a core material is as follows.
The surface properties related to the surface quality as a handle of a luxury handbag such as waterproofness, color fastness, smoothness of the surface, etc., and further, it is appropriately selected and used in consideration of the hardness etc.,
It is preferable to use a polyolefin resin. The polyolefin resin referred to in the present invention is, for example, a high-, medium-, or low-density polyethylene resin, a linear low-density polyethylene resin distributed in a low-density region, a chlorinated polyethylene, an ethylene-ionomer, a rubber-modified polyethylene, and the like. Polyethylene resins represented by ethylene-vinyl acetate copolymers, polypropylene resins represented by homopolypropylene resins, and polypropylene copolymers represented by ethylene-propylene copolymers And a rubber-modified polypropylene resin. These resins are generally resins of relatively hard nature,
The resin is classified as a resin having relatively soft properties, and is selected and used in accordance with the characteristics of the target string. Therefore, it is desirable to appropriately mix resins having both properties and use them so that various harmony can be achieved. Among these polyolefin-based resins, the resin used for the resin coating layer 3 in the string 1 of the present invention is preferably a mixed resin of an ethylene-based resin and a propylene-based resin. And linear low-density polyethylene (L-LDPE) are preferred. The relationship between the resin composition and the tensile strength and bending stress of the cord when a mixed resin of a polyethylene resin and a polypropylene resin was used as the resin of the coating layer was examined, and the results are shown in Table 4. A graph is shown in FIG.

[0046]

[Table 4]

FIG. 17 shows that by selecting the mixing ratio of the resin having the hard property and the resin having the soft property, the tensile strength and the bending stress required for the handle string can be harmonized.

The handle string 1 of the present invention produced as described above has a core material 2 and a resin coating layer 3 which is coated on the entire surface of the core material 2 in a tightly contacted state, so that the handle string is required to be sufficient as a handle string. It has a tensile strength, which is in accordance with JIS Z153
40kgf or more, 55kg when measured according to 3.
less than f.

According to the above-described manufacturing process, the handle string 1 of the present invention in which the entire surface of the core material 2 is closely covered with the thin synthetic resin coating layer 3 as shown in FIG. 1 can be obtained.
The thus-manufactured string 1 for a handle according to the present invention has sufficient tensile strength as a handle, and has low bending stress, high roundness, and no directionality of the string cross section. It has excellent machinability and can be efficiently manufactured with existing handle manufacturing machines.It is also easy to form the handle into a horseshoe shape, and the shape of the handle can be manufactured without irregularity close to the pre-designed target shape. Has reproducibility. Moreover, since the string is soft, the string is pressed by a pressing roller or the like during bonding and deforms flat, and the bonding surface spreads, so that the bonding strength to the bag or the reinforcing paper is increased. In addition, the handle string 1 of the present invention.
Is not limited to those described above, and various methods can be adopted as long as a string having the structure defined in the present invention can be obtained.

The string 1 of the present invention as described above is cut into a predetermined length, and, for example, using an existing handle making machine as shown in FIG. 9, the string 1 as shown in FIG. Can be bent at an intermediate portion thereof, and a handle 6 of a handbag bag which is sandwiched between two reinforcing papers 5, 5 and fixed with an adhesive or the like in a state in which both ends are spaced from each other can be obtained. The adhesive used in this case is a solution-type adhesive which solidifies when a solvent volatilizes, a water-based adhesive represented by a water-soluble adhesive or an emulsion adhesive, or a reaction-type adhesive which utilizes thermal curing of a resin. Adhesives, such as hot melt adhesives utilizing thermal softening / melting of resin, are conventionally used for bonding the handle of the bag. Among them, it is desirable to use a hot melt adhesive represented by an ethylene-vinyl acetate copolymer and a styrene-based block copolymer.

The handle 6 of the carrying bag according to the present invention manufactured as described above has a cross-sectional shape of the handle string 1 that is close to a perfect circle and has excellent shape quality, and the string 1 is not twisted. It has independence as a handle and has an appearance quality that can be a major part of the design of the entire handbag 9. Moreover, since the shape of the handle is the same as the target shape, this handle 6
Is attached to the opening edge of the bag, and becomes a bag excellent in overall design in which the shape of a pair of handles 6, 6 excellent in appearance quality is uniform.

Here, prior to the description of the embodiments, a method for evaluating the characteristic value of a string according to the present invention will be described below. (1) Evaluation of the characteristic value of the handle string Tensile strength: gripping interval 10c in accordance with JIS Z1533 (flat yarn for polyolefin cloth)
m at a tensile speed of 30 cm / min. Bending stress: Load (F), load length (L), and string diameter (d) applied to a load point when performing a bending test in accordance with JIS P8125 (a stiffness test method using a Taber stiffness tester for paperboard) ) Is calculated by the following (Equation 1). Bending stress (σ _b ) = (32 × F × L) / (π × d ³ ) (Equation 1) Pull-out strength (the degree of close contact between the core material and the coating layer): the apparatus shown in FIG. Use, gripping interval 20cm, pulling speed 50c
The maximum load [kgf] when pulled at m / min is measured. String diameter and roundness: Cut the string with a sharp rotating blade in such a way that the cross-sectional shape of the string is not deformed.
The diameter is measured at eight points at 45 ° intervals in the circumferential direction at one location in the length direction at 0 × 1/10 mm scale), and it is measured at n = 10 per 1 m length. The maximum value, the minimum value, and the average value of the diameter of each point are obtained, and the total average of those n = 10 diameters is defined as the diameter, and the ratio of the maximum value and the minimum value (minimum value /
The maximum value is the roundness. Thickness of coating layer: Cut the coating layer with a sharp rotary knife in the length direction of the cord, remove the core material, leave only the coating layer, dial gauge (tip diameter 2 mm, with 1/100 scale) The thickness in the circumferential direction is 4 per one point in the length direction of the string.
Point measurement is performed, and the measurement is performed at n = 10 per meter, and the total average value is defined as the thickness of the coating layer. String weight: Test length 1 with a sharp rotary knife in the length direction of the string
m, and weigh it with an electronic balance (minimum scale 1/100
g).

[0053]

【Example】

[Basic manufacturing method of handle string] Basis weight 38 g / m ² , width 9
A 100 mm width kraft paper web is formed into a 100 mm wide paper tape in the slitting step shown in FIG. This paper tape was humidified (water content about 12%) in the humidification step of FIG.
Convergence and twisting of paper tape using the plasticity of water-containing paper in the convergence and twisting process of Step 2 (target twist number 15T / 30cm)
Then, by drying (water content about 7%), the paper core is twisted and fixed using the drying shrinkage force of the paper. Fig. 13
The resin coating is performed in the extrusion coating step shown in (1) to obtain a coated cord.
The standard conditions for the extrusion coating step are as follows: an extruder having a diameter of 40 mm and an L / D of 25 was used, and the extruded resin temperature was 190 ° C.
min, nozzle diameter 8 mmφ, draft ratio 3.6, winding at a take-up speed of 25 m / min. The resin used is LL [linear low-density polyethylene, product code A10
7F-2: manufactured by Japan Polyolefin Co., Ltd., density 0.9
17, MFR 0.7] and modified PP [rubber-modified polypropylene, trade name Cataloy, trade name KS359P: M
ONTELL-JPO Corporation, density 0.877, M
FR12].

[Experimental Example 1] In contrast to the above-described basic method for producing a handle string, the resin to be subjected to extrusion coating was 100/0, 60/40, and 0 / at a component ratio represented by (LL / modified PP).
The draft ratio at the time of coating was set to 1. by changing the extrusion nozzles (those having different diameters) to be used.
Except that the standard was changed to four levels of 1, 3.6, 5, and 7.1, the above-described basic manufacturing method of the handle string was performed to obtain 12 kinds of coated strings. About the obtained 12 types of coated strings,
The pulling strength was measured by the method described in the text, and the results were shown in Table 3.
And the results are graphed in FIG. According to the results of FIG. 16, it is understood that it is necessary to select a draft ratio and increase the drawing strength. This phenomenon is considered to be a peculiar phenomenon of the present invention caused by the fact that the core material is a paper cord.

[Experimental example 2] The draft ratio at the time of coating was 3.6.
And the component ratio of the coating resin represented by (LL / modified PP) is 100/0, 80/20, 60/40, 30
The experiment shown in Experimental Example 1 was repeated, except that the level was changed to five levels of / 70 and 0/100, thereby obtaining five types of coated cords. Tensile strength and bending stress of the obtained five types of coated cords were measured by the method described in the text, and the results are shown in Table 4, and the results are graphed and shown in FIG. According to the result of FIG.
It can be seen that the adjustment of the tensile strength and the bending stress required for the handle string can be harmonized by selecting the mixing ratio of the resin having a hard property (for example, LL) and the resin having a soft property (for example, a rubber-modified polypropylene). .

[Examples 1, 2, 3] (LL / modified PP)
The extrusion rate was 200 g / min, 163 g / min, and the component ratio of the resin indicated by was fixed to a mixed resin of 60/40.
138 g / min (resulting in draft ratios changing to 2.5, 3.1, 3.6 respectively)
The same handle string as that of Experimental Example 1 was manufactured, and three types of coated strings were obtained. This string is used in the order of Example 1, Example 2, Example 3
Called. For the three types of coated cords obtained, the diameter of the cord, the thickness of the coating layer, the roundness, the weight, the tensile strength, the bending stress and the pull-out strength were measured by the method described in the text, and the results were shown in Table 5. Indicated.

[0057]

[Table 5]

Using the three types of coated cords obtained in the above Examples 1, 2 and 3, and using the existing grip making machine shown in FIG. The handle 6 attached to the reinforcing paper 5 as shown in FIG. In this case, the feed pitch L is 190.5 mm and the string height H is 1
20 mm, the reinforcing paper width W is 100 mm, and the reinforcing paper
A kraft paper having a basis weight of 80 g / m ^{2 and} an ordinary hot melt adhesive (ethylene-vinyl acetate copolymer) were used as the adhesive. The obtained handle 6 is connected to a bag making machine [Model: 127 manufactured by Neurong Co., Ltd.]
T) bag manufacturing machine] and paste it on the base paper for bag making,
When the handbag 9 was finished, as shown in FIG. 6, the handbag 9 having the reinforcing paper 5 of the handle 6 adhered to the inside of the open end of the bag 7 with the adhesive layer 8 was manufactured. In this case, the material of the bag 7 is kraft paper having a basis weight of 120 g / m ² , and the dimensions of the bag 7 are as follows.
As shown in FIG. 4, the front dimensions w were set to 320 mm, the finished height h was set to 320 mm, and the gusset width d was set to 115 mm.
As the adhesive for bag making, a commercially available vinyl acetate emulsion-based adhesive is used, and the line speed is 60 bags / min.
Two levels per bag were used. In the course of bag making, paying particular attention to the handle manufacturing process, the frequency of occurrence of loss (separation of strings during bending deformation processing) shown in a and b of Table 6-1 below,
[Occurrence frequency of cracks (string breaks) at the time of bending deformation] was observed and evaluated using the scales and standards shown in Table 6-1 and Table 6-2.
In addition, the obtained bags are shown in Tables 6-1 below, c, d, and e.
, The magnitude of the deviation from the designed orbital value of the target curved shape, the frequency of occurrence of the deviation of the target curved shape, and the mounting strength of the handle attached to the bag are measured, and Table 6-1 Table 6-2
The evaluation was made according to the scale and criteria shown in Table 1. Table 7 shows the evaluation results. For comparison, an experiment using two types of commercially available products (commercially available product A and commercially available product C in Table 2) on the above-described grip making machine and a continuous bag making machine was performed in the same manner as in the example. The same observation, measurement, and evaluation were performed under the same conditions.
Table 7 also shows the results.

[0059]

[Table 6]

[0060]

[Table 7]

[0061]

[Table 8]

According to the results of Table 7 based on Tables 6-1 and 6-2, the handle string of the present invention has excellent suitability for bending deformation processing even when an existing handle manufacturing machine is used. It can be seen that a curved handle according to the shape can be efficiently obtained with shape reproducibility. In addition, the handle string of the present invention can be provided with a variety of robust colors depending on the color and design of the bag by appropriately adding a pigment to the synthetic resin constituting the coating layer. .

[0063]

As described above, the handle string of the carrying bag according to the present invention has a tensile strength and a mounting strength to the bag which are required as a handle, and is combined with a variety of coloring properties which are robust. It is a high-quality handle string having a neat and high-quality feel, and is excellent in bending processing applicability at the time of manufacturing a handle, and can be efficiently and economically manufactured by an existing handle manufacturing machine.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view showing a string according to the present invention.

FIG. 2 is a perspective view showing a state in which a core material is exposed except for a part of a coating layer of a string according to the present invention and the core material is expanded.

FIG. 3 is a perspective view showing an example of a handle of the handbag according to the present invention.

FIG. 4 is a perspective view showing an example of a handbag according to the present invention.

FIG. 5 is an explanatory diagram of a step of forming a handle.

FIG. 6 is a perspective view showing an example of attaching a handle to a carrying bag.

FIG. 7 is a front view of a handbag in which a handle string is curved in a horseshoe shape.

FIG. 8 is a front view of a handbag having irregular handle shapes.

FIG. 9 is a plan view showing the outline of handle production by an existing handle production machine.

FIG. 10 is a schematic view of a slitting step of a raw paper sheet during a manufacturing process of the handle string according to the present invention.

FIG. 11 is a schematic view of a paper tape humidifying step during the manufacturing process of the handle string according to the present invention.

FIG. 12 is a schematic view of a paper tape convergence / twist fixing step during the manufacturing process of the handle string according to the present invention.

FIG. 13 is a schematic view of an extrusion coating step during a manufacturing step of the handle string according to the present invention.

FIG. 14 is a diagram showing a method for measuring the pull-out strength, which indicates the degree of close contact between the cord core material and the coating layer in the present invention.

FIG. 15 is a diagram showing a method for measuring the attachment strength of the handle according to the present invention.

FIG. 16 is a graph showing the relationship between the draft ratio at the time of extrusion molding of the cord according to the present invention and the pull-out strength (degree of close contact) between the cord core material and the coating layer.

FIG. 17 is a graph showing the relationship between the resin composition of the coating layer of the string according to the present invention and the tensile strength and bending stress of the string.

[Explanation of symbols]

1 string, 2 core material, 3 coating layer, 5 reinforced paper, 6
Handle, 7 bags, 8 glue, 9 handbag, 1
0 raw paper, 11 slitters, 12 paper tape, 1
3 Humidifying means, 14 Humidity control unit, 15 dice, 16
Paper core, 17 Humidity control / drying unit, 18 Preheating furnace, 19
Die, 19a nozzle, 20 deaeration means, 21 cooling water tank, 22 take-up roll, 23 slow cooling unit, 30
Handle making machine, 31a, 31b String winding part, 32
Pressing roller, 33 slitter, 34 step roll,
35 Interlocking device, t wall thickness of coating layer, D diameter of string.

Claims (10)

[Claims] 1. A composite cord having a core material surface coated with a coating material, wherein the core material is formed by converging and twisting a paper tape, and the entire surface of the core material is coated with a thin synthetic resin. A handle of a carrying bag, wherein a layer is closely covered with the core material, and a roundness represented by a ratio of a minimum value to a maximum value of the diameter (minimum value / maximum value) is 0.8 or more. Cord. 2. The thickness (t) of the coating layer is 0.3 to 1.1.
mm, the string diameter (D) is in the range of 3 to 7 mm, and the ratio of the thickness (t) of the coating layer to the string diameter (D) [(t / D) × 100] is 4. The handle string of the handbag according to claim 1, wherein the range is 2 to 16%. 3. The number of twists of a paper tape string as a core material is 10
The handle strap of the handbag according to claim 1 or 2, which has a size of 20T / 30cm. 4. The close contact between the core material and the coating layer, which is indicated by the pulling strength measured by the following measurement method, is 5 kgf or more and 15 kgf or more.
The handle strap of the handbag according to claim 1, 2 or 3. Pulling strength measurement method: Using the apparatus shown in FIG. 14, a grip interval of 20 cm and a pulling speed of 50 cm / m
The maximum load [kgf] when pulled in is measured. 5. The handle strap of the handbag according to claim 1, wherein the tensile strength measured according to JIS Z1533 is 40 kgf or more and less than 55 kgf. 6. A bending stress calculated from a load (F), a load length (L), and a string diameter (d) applied to a load point when a bending test is performed in accordance with JIS P8125 by the following (formula 1). (Σ _b ) is 80 to 120 (kgf / c)
Claim 1 is m ^2), according to claim 2, claim 3, claim 4, or claim 5 grip for strap Carrier bags according. Bending stress (σ _b ) = (32 × F × L) / (π × d ³ ) (Equation 1) 7. The handle strap of the handbag according to claim 1, wherein the resin coating layer is made of a polyolefin resin. 8. The handle strap according to claim 7, wherein the polyolefin resin is a mixed resin of an ethylene resin and a propylene resin. 9. The handle string according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, or claim 8 is cut to a predetermined length. A handle of a carrying bag which is curved at an intermediate portion thereof and is fixed to reinforcing paper with both ends thereof being spaced from each other. 10. A carrying bag comprising the handle according to claim 9 and a reinforcing paper portion fixedly attached to an opening edge of the bag.