JP7398076B2 - rucksack - Google Patents

Description

The present invention relates to a rucksack .

A typical rucksack has a bag and a pair of shoulder belts, and is configured so that the bag can be carried on the back by hanging one shoulder belt on the right shoulder and the other shoulder belt on the left shoulder ( Patent Document 1). The backpack shoulder belt described in Patent Document 1 is composed of an elastic core material and an outer fabric covering the core material. Further, in a typical rucksack, the bag is made of fabric, and there are some cases in which a cushioning material is arranged in the part of the bag that corresponds to the user's back, that is, the back rest. This cushioning material is usually covered with a suitable fabric similar to the core material of the shoulder belt.

International Publication No. 2018/088056 (Paragraph 0024)

However, conventional shoulder belts and bags have elastic core materials and cushioning materials as described above, and although these materials come into contact with the user's body through clothing, they do not have good breathability. There is a problem of scarcity. For this reason, there is a problem for the user in that sweat tends to accumulate on the shoulders and back. Furthermore, unless the core material and cushioning material described above are well-suited to the user's body, it is difficult to give the user a good cushioning feeling. In addition, products that simply use elastic core materials or cushioning materials can provide flexibility, but lack rigidity and cushioning properties, and when carrying heavier items, they fit too tightly to the body, making it uncomfortable to carry. There is a problem with poor performance.

Therefore, the present invention solves these problems by creating a material that has breathability and cushioning properties, and also has both cushioning properties and rigidity, and can be suitably used for shoulder belts and backrests of backpacks. Aim to get a rucksack containing .

To achieve this purpose, the backpack of the present invention has the following features:
Including the material forming the shoulder belt and/or the part that corresponds to the user's back,
The material is composed of a double raschel knitted fabric in which the outer material and the lining are connected by a connecting thread,
The outer material is composed of a knitted fabric with a mesh structure in which the mesh shape is hexagonal or square ,
The lining is made of a tightly knitted fabric that does not have a mesh structure ,
The yarn forming the knitted fabric of either the outer material or the lining is a composite heat-fusible fiber having a high melting point polymer and a low melting point polymer, and the yarn is a composite heat-fusible fiber having a high melting point polymer and a low melting point polymer, and the yarn is formed by melting and resolidifying the low melting point polymer. , is made of fibers with a high melting point polymer fixed to them while maintaining their fiber form.
The threads forming the other knitted fabric of the outer material and the lining are made of fibers that maintain a flexible fiber form without being affected by the heat during melting of the low melting point polymer of the composite heat-fusible fiber. is formed,
The other knitted fabric of the outer fabric and the lining fabric is arranged on the body side of the user of the rucksack.

According to the rucksack of the present invention, the material included in the rucksack is composed of a double raschel knitted fabric in which an outer fabric and a lining fabric are connected by a connecting thread, and the outer fabric has a mesh having a hexagonal or square shape. Since it is made of knitted fabric with a certain mesh structure , it has excellent breathability, so when wearing a backpack made of this material, sweat does not accumulate on the shoulders and back of the user. In addition, since the outer material and the lining are made of a three-dimensional woven or knitted fabric connected by connecting threads, it can provide appropriate cushioning for the user's shoulders and back. Since the lining is made of a tightly knitted fabric that does not have a mesh structure, it is possible to impart strength and shape retention to the material. Further, the yarn forming the knitted fabric of either the outer material or the lining material is a composite heat-fusible fiber having a high melting point polymer and a low melting point polymer, and the yarn is a composite heat-sealable fiber having a high melting point polymer and a low melting point polymer, Since it is made of fibers with a high melting point polymer fixed to it while retaining its fiber form, it also has the appropriate amount of rigidity that is desirable for shoulder straps and backrests for backpacks, making it ideal for storing heavy items. Even when the backpack is exposed to heavy loads, it maintains its thickness without fading easily under the load, and has excellent breathability and cushioning properties, making it possible to provide a backpack that is comfortable to carry.

1 is a diagram illustrating a backpack of the present disclosure . FIG. FIG. 2 is a diagram showing a rucksack material used in the rucksack of FIG. 1; FIG. 3 is an enlarged view of main parts of the backpack material shown in FIG. 2; 4 is a schematic representation of the portion shown in FIG. 3, with connecting threads omitted. FIG. It is a sectional view of the main part of the same material. FIG. 3 is a diagram showing a cross-sectional structure of a composite heat-fusible fiber used for the same material. FIG. 2 is a cross-sectional view schematically showing a state when a yarn made of the same composite heat-fusible fiber is heat-set. FIG. 2 is an enlarged view of the main parts of the material included in the backpack according to the embodiment of the present invention . FIG. 9 is a sectional view of a main part of the material shown in FIG. 8; 3 is a diagram showing the knitting structure of the material of Reference Example 1. FIG.

In the backpack shown in FIG. 1, 11 is a bag, and 12 is a pair of shoulder belts. The bag 11 is formed of a resin sheet into a bag shape, and the shoulder belt 12 is formed into a thick belt shape from a resin material. The bag 11 is formed with a backrest 13 that comes into contact with the user's back when the user wears the bag.

A material 14 is used for the shoulder belt 12 and the backrest 13. As shown in FIGS. 2 to 5, this material 14 has a outer material 15 and a lining 16, and has a large number of connecting threads 17 that connect the outer material 15 and the lining 16, thereby achieving the required elasticity. Constructed of double raschel knit fabric that allows for maximum performance. The outer material 15 is a mesh-like body, that is, a knitted fabric having a mesh structure. The lining 16 is preferably a knitted fabric having a mesh structure similar to that of the outer material, as shown in the figure. However, in the embodiment of the present invention, as will be described later, the lining 16 is made of a ground texture, that is, a general tight knitted fabric that is not a mesh structure, instead of having a mesh structure. . The connecting thread 17 connects the threads forming the outer material 15 and the threads forming the lining material 16.

The mesh structure of the illustrated outer material 15 and lining material 16 in the present disclosure will be described. This mesh structure is a polygonal mesh structure, and in the illustrated example, the mesh shape is hexagonal. In addition to this, a square mesh structure can also be easily realized, and the shape of the mesh in that case will be a rhombus, although not shown.

In the present disclosure , the mesh structure of the outer material 15 and the lining material 16 is such that one side of a polygon is composed of 2 to 60 stitches. The reason why the number of stitches constituting one side is set within this range is mainly from the viewpoint of stability of the three-dimensional shape of the mesh.

The constituent threads of the outer material 15 and the constituent threads of the lining material 16, which are made of a mesh structure, are connected by the connecting thread 17 as described above. As shown in the figure, the connecting yarns 17 are arranged in the thickness direction of the double raschel knitted fabric, and a large number of connecting yarns 17 are arranged between the yarns forming the outer fabric 15 and the yarns forming the lining 16 due to the knitting structure. There is. The fineness is preferably 100 decitex or more from the viewpoint of the shape stability of the material 14.

The yarns constituting the material 14, that is, the double raschel knitted fabric, can be made of any suitable material that allows the double raschel knitted fabric to have suitable elasticity for the bag 11 and shoulder belt 12 of a rucksack. Such materials may include polyesters such as polyethylene terephthalate, polyamides, and other thermoplastics.

The threads forming the knitted fabric of either the outer fabric 15 or the lining fabric 16 of the material 14 are composed of composite heat-fusible fibers. Such a composite heat-fusible fiber has a sheath made of a low-melting thermoplastic polymer, and a core made of a high-melting thermoplastic polymer that has a higher melting point than the low-melting thermoplastic polymer of the sheath. Examples include core-sheath type heat-fusible fibers. When the polymer does not have a melting point, the softening point is compared instead of the melting point. Other examples include side-by-side heat-fusible fibers in which a low melting point thermoplastic polymer and a high melting point thermoplastic polymer are arranged equally.

FIG. 6 shows a cross-sectional structure of a composite heat-fusible fiber having a core-sheath type cross-sectional structure. Here, 18 is a core part and 19 is a sheath part. Examples of the high melting point polymer constituting the core portion 18 and the low melting point polymer constituting the sheath portion 19 include polyester polymers, polyamide polymers (nylon), polyolefin polymers, polybutyral polymers, and polyester polymers. Examples include acrylic polymers, polyethylene-vinyl acetate copolymers, polyurethane polymers, and the like. When the flexibility of the material 14 is important, it is preferable that both polymers are polyamide-based polymers, and in terms of superior strength and required rigidity, it is preferable that both polymers are polyester-based polymers. preferable.

Preferred combinations of low-melting point thermoplastic polymers and high-melting point thermoplastic polymers are low-melting point polyester and high-melting point polyester, and low-melting point polypropylene and high-melting point combinations, considering their compatibility and performance during thermal bonding as described below. Examples include polypropylene, polyethylene and polypropylene, and low melting point nylon and high melting point nylon.

From the viewpoint of the material 14 for a backpack, the mass ratio of the high melting point thermoplastic polymer and the low melting point thermoplastic polymer in the composite heat-fusible fiber, that is, the mass ratio of the core portion 18 and the sheath portion 19, is, for example, The mass ratio of high melting point thermoplastic polymer/low melting point thermoplastic polymer is preferably 2/8 to 8/2, more preferably 2/1 to 3/1.

The material 14 is made of a heat-set material so that it can exhibit more suitable performance as the shoulder belt 12 and the backrest 13. By heat setting, as shown in FIG. 7, the low melting point thermoplastic polymer of the sheath 19 is melted or softened and then solidified again, thereby bonding the core parts 18 of the plurality of fibers together as shown in the figure. They can be fixedly integrated with each other by thermal bonding. As a result, the knitted fabric itself composed of composite heat-fusible fibers loses the suppleness of fiber fabrics and becomes rigid and morphologically stable, allowing the mesh mesh to have an appropriate size. As a result, the three-dimensional form of the shoulder belt 12 and the backrest 13 can be stabilized, the required breathability can be secured, and the material 14 can be fixed in an open state. In addition, it is possible to provide moderate elasticity suitable for the shoulder belt 12 and the back rest 13, cushioning properties against objects stored inside the bag 11, fitability to the user's body, and rigidity.

During the heat setting process, the low melting point thermoplastic polymer of the sheath part 19 as a heat fusion component is melted or softened as described above, and in some cases, as shown in the figure, it loses its fiber form and then resolidifies. However, at that time, the heat setting treatment temperature is set to a temperature that is higher than the melting point or softening point of the low melting point thermoplastic polymer of the sheath part 19 and lower than the melting point or softening point of the high melting point thermoplastic polymer of the core part 18. By doing so, the high melting point thermoplastic polymer of the core portion 18 is maintained in a fiber form. As a result, the rucksack material 14 of the present invention becomes a sheet-like body containing fibrous components, so it has higher strength than a material made of a simple resin sheet that does not contain such fibrous components. It can be made to be superior in terms of performance.

8 and 9 show examples of the material 14 included in the backpack of the present invention. In this material 14, as described above, the lining 16 is made of a ground texture, that is, a general tightly knitted fabric that does not have a mesh structure, instead of having a mesh structure. With such a configuration, for example, excellent breathability can be ensured by placing the outer material 15 on the user's body side, and the lining 16 can be made of a general tightly knitted fabric. With this configuration, the required strength and shape retention can be imparted to the shoulder belt 12, and since the backrest 13 is also integrated with the bag 11, the strength of the bag 11 on the user's back can be improved. Shape retention can be improved. In addition, since it is a regular knitted fabric with a tight weave, it is easy to attach to the bag 11. On the other hand, even when the mesh-like outer material 15 is placed on the side opposite to the user's body and the lining 16 is placed on the user's body side, excellent breathability, shape retention, and cushioning properties are achieved . .

Using the material 14 described above, the shoulder belt 12 of the rucksack and the backrest 13 of the bag 11 shown in FIG. 1 are formed. The shoulder belt 12 can exhibit better breathability by exposing the mesh-structured outer material 15 or lining material 16 to the user 's body side. In order to improve wearability and decorativeness, it is preferable to cover the parts other than the user 's body side with a sheet material 20 such as cloth. Similarly, the backrest 13 can be made more breathable by exposing the mesh-structured outer material 15 or lining 16 to the user 's body side. Although not shown in the drawings, the backrest 13 can also be made more decorative by, for example, being bordered with a sheet material such as cloth.

In some cases, contrary to the above, the mesh-structured outer material 15 or lining material 16 may be exposed on the side opposite to the wearer's body side.

The shoulder belt 12 and backrest 13 constructed using such a material 14 have good breathability as described above, and have the advantage that sweat does not accumulate when worn. In addition, since it is made of double raschel knitted fabric, it has appropriate cushioning properties, which can reduce the burden on the user when wearing it. Furthermore, because it has been heat-set, it can exhibit appropriate rigidity and form stability, and is not excessively flexible and will not fit too tightly to the body when worn. When compressed, the load is received and compressed not at a point but on the whole surface, so it is possible to maintain a certain level of thickness even when compressed, and based on this, it is possible to ensure cushioning properties and breathability. and has excellent buffering properties. Therefore, it is more suitable as the shoulder belt 12 or backrest 13 of a rucksack.

In the following reference examples and comparative examples, evaluation of each physical property and performance test were performed as follows.

(a) Three-point bending stress A sample was cut to a length of 70 mm and a width of 50 mm, and a three-point bending test was performed on the central part of the sample in accordance with JISK-7171 so that the indenter was along the wale direction of the sample. The test speed was 2 mm/min, and the distance between fulcrums was 32 mm. The stress was measured when the indenter was displaced by 7 mm starting from the point where the load began to be applied to the sample. The measurement was performed five times, and the average value was calculated as the three-point bending stress.

(b) Compressive stress A sample was cut to a length of 70 mm and a width of 50 mm, and placed on a flat metal plate. According to JISK-7171, the center of the sample was compressed with an indenter so that the indenter ran along the wale direction of the sample, and the stress when the indenter was displaced by 2 mm was measured. The measurement was performed five times, and the average value was calculated as the compressive stress.

(c) Performance test as a cushioning material for a rucksack A sample cut to 30 cm long x 20 cm wide was used as a backrest material for a backpack with a capacity of 22 L and 48 cm long x 25 cm wide x 22 cm deep. In addition, the same sample cut to 40 cm in length x 5 cm in width was used as the left and right shoulder belts of the same backpack, one on each side. A weight of 10 kg was placed inside the rucksack, and a sensory evaluation was conducted on the rigidity, fit, breathability, and cushioning properties of the rucksack as a backrest and shoulder belt when a person actually carried the rucksack on their back.

Reference example 1
Using a double raschel knitting machine equipped with six reeds, the following raw yarns were supplied to L1 to L6 reeds and knitted into the structure shown in FIG. 10. When the organization shown in FIG. 10 is displayed in four tempos, it is as follows.

L1:2111/1222/1011/1211/1011/1211/1011/
1222/2122/2322/2122/2322/2122/2322
L2:1222/2122/2322/2122/2322/2122/2322/2111/1211/1011/1211/1011/1211/1011
L3:2110/1210/1210/1210/1210/1210/1210/
1223/1223/2123/2123/2123/2123/2123
L4:1223/2123/2123/2123/2123/2123/2123/
2110/1210/1210/1210/1210/1210/1210
L5:1112/1110/1112/1110/1112/1101/1112/
2221/2223/2221/2223/2221/2223/2221
L6:2221/2223/2221/2223/2221/2223/2221/
1112/1110/1112/1110/1112/1110/1112

here,
L1: Manufactured by Unitika, product name: "MELSET CM27" 280 dtex 48 filament (multifilament yarn consisting of core-sheath composite heat-sealable fiber, core: polyethylene terephthalate (PET), sheath: copolymerized polyester, core-sheath ratio (mass ratio) Core: sheath = 2.7:1) 3 pieces L2: Unitika product name "Merset CM27" 280dtex 48 filament thread 3 pieces (same as L1)
L3: 2 pieces of PET monofilament yarn manufactured by Unitika (product number PV21) 280 dtex L4: 2 pieces of PET monofilament yarn (product number PV21) 280 dtex manufactured by Unitika (same as L3)
L5: Manufactured by Unitika, product name: "MELSET CM27", 3 pieces of 280dtex 48 filament (same as L1)
L6: Manufactured by Unitika Co., Ltd. under the trade name "MELSET CM27" Three 280 dtex 48 filaments (same as L5) were used.

The knitted net fabric had substantially hexagonal meshes on both the outer fabric and the lining fabric, and the outer fabric and the lining fabric were connected by PET monofilament yarn. The total width was 1270 mm, the thickness was 5.9 mm, the course density was 26.2 lines/inch, the wale density was 14.0 lines/inch, and the basis weight was 1000 g/ ^m2 . This net fabric was heat-treated at 180°C for 2 minutes using a pin tenter, resulting in a net with a total width of 985 mm, a thickness of 5.5 mm, a course density of 25.4 threads/inch, a wale density of 9.1 threads/inch, and a basis weight of 622 g/ ^m2. Obtained earth structure materials.

Reference example 2
Compared to Reference Example 1, the following difference was made in that the following raw yarns were used for L1 reed and L2 reed among the six reeds. Other than that, a material with a net structure was obtained in the same manner as in Reference Example 1.
L1: Unitika PET multifilament yarn (product number E814) 3 280dtex 48 filaments L2: Unitika PET multifilament yarn (product number E814) 3 280dtex 48 filaments (same as L1)

The net structure material of Reference Example 2 has one side composed only of heat-fusible conjugate fibers and is cured by heat-fusion to improve shape stability, and the other side is unaffected by heat. Since it maintains a flexible fiber form, it has both rigidity, form stability, and flexibility, and has a better fit to the body than Reference Example 1 . When applied to a rucksack, by positioning the side made only of heat-fusible conjugate fibers on the side other than the body side, a better fit to the body was achieved.

Comparative example 1
Compared to Reference Example 2 , the following difference was made in that the following yarns were used for L5 reed and L6 reed out of the six reeds. Other than that, a material with a net structure was obtained in the same manner as in Example 1.
L5: Unitika PET multifilament yarn (product number E814) 3 280dtex 48 filaments (same as L1)
L6: Unitika PET multifilament yarn (product number E814) 3 280dtex 48 filaments (same as L5)

Table 1 shows the measurement and evaluation results for the materials of Reference Example 1, Reference Example 2 , and Comparative Example 1.

The net structure materials of Reference Examples 1 and 2 have high stress values in both three-point bending and compression, are difficult to compress, maintain their three-dimensional structure well against pressure, and have good morphological stability. It was excellent and could maintain air permeability. In addition, in Reference Example 2 , when measuring the three-point bending stress and the compressive stress, measurements were made with the surface side other than the knitted fabric side composed only of heat-fusible conjugate fibers as the upper surface. In addition, even if a rucksack is made in which the mesh structure material of Reference Example 1 and Reference Example 2 is applied to the shoulder belt and back rest of the rucksack, and a weight of 10 kg is put in and carried on the back, It felt good. On the other hand, the net structure material of Comparative Example 1 had less stress than Reference Examples 1 and 2 , and was difficult to maintain its three-dimensional structure against pressure. That is, in Comparative Example 1, both the outer material and the lining material were made of fibers that were not affected by heat, and therefore had a net structure without rigidity .

Claims (1)

A rucksack, including the material forming the shoulder straps and/or the part that corresponds to the user's back,
The material is composed of a double raschel knitted fabric in which the outer material and the lining are connected by a connecting thread,
The outer material is composed of a knitted fabric with a mesh structure in which the mesh shape is hexagonal or square ,
The lining is made of a tightly knitted fabric that does not have a mesh structure,
The yarn forming the knitted fabric of either the outer material or the lining is a composite heat-fusible fiber having a high melting point polymer and a low melting point polymer, and the yarn is a composite heat-fusible fiber having a high melting point polymer and a low melting point polymer, and the yarn is formed by melting and resolidifying the low melting point polymer. , is made of fibers with a high melting point polymer fixed to them while maintaining their fiber form.
The threads forming the other knitted fabric of the outer material and the lining are made of fibers that maintain a flexible fiber form without being affected by the heat during melting of the low melting point polymer of the composite heat-fusible fiber. is formed,
A rucksack characterized in that the other knitted fabric of the outer material and the lining is placed on the body side of the user of the rucksack.

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