TW202039948A - Open mesh leno fabric, a bag made from it, and a method of making the leno fabric - Google Patents

Abstract

This invention relates to producing bags for packing and storing of goods. More particularly, the invention relates to flat or tubular leno weave fabric which is comprised of at least one warp thread (6A) that has one of its strands (6B or 6C) made from bulk yarn as weft and/or at least one of its weft threads (5A) is made from bulk yarn, and a bag made from such fabric. The invention addresses the problem of harshness of the leno weave fabric made from stiff yarn, particularly on perishable goods and other goods that can get damaged by harsh packaging. Woven fabrics typically comprise warp and weft structures that formed using warp and weft threads, respectively. Woven slit film tape fabric typically comprises of two sets of threads arranged in warp structure and weft structure. Threads are typically made of multiple slit film tapes. The fabric of the invention has some bulk yarn introduced in the weaving pattern to make the fabric softer than the conventional fabric. This key aspect of the invention has led to bags that are less harsh on the goods, than bags made from conventional leno fabric made from stiff yarn.

Description

Open mesh leno fabric, bag made therefrom and method for manufacturing the leno fabric

The present invention relates to the production of bags for packaging and storing goods. More specifically, the present invention relates to packaging and storing perishable agricultural products (agricultural products). Even more specifically, the present invention relates to a bag made of a flat or tubular fabric that includes at least one bulky yarn as a weft and at least one combination of bulky and hard yarns in the warp, wherein the weft Knitted by leno is held in position relative to each other.

Generally speaking, open mesh leno bags used for packaging different agricultural products such as potatoes, onions, fruits, flowers and the like are made of cut film tapes of polyethylene or polypropylene materials. The cut film tape material imparts the desired air permeability or openness to the fabric bag, however, the rough edges of the tape bring a rough feeling when touched, which may damage more delicate and perishable agricultural products. Furthermore, due to the smooth performance of the slit film tape, the dimensional stability of the fabric is impaired, whereby the bag cannot maintain its shape during the handling of the bag.

Furthermore, in order to improve the softness of the fabric and the resulting bag, if only the multifilament yarn is used to make leno bags, there will be greater dimensional stability problems during bag handling, product packaging and bag storage. Therefore, it is necessary to improve the structure of the bag to provide flexibility and dimensional stability. The purpose of the invention:

One of the objectives of the present invention is to provide softness to the bag contents and to provide sufficient coverage with required breathability/openness.

Another object of the present invention is to provide rigidity to the bag structure, thereby imparting dimensional stability to the bag and its contents.

Another object of the present invention is to provide a fabric structure suitable for automated bag processing.

The present invention relates to the production of bags for packaging and storing goods. More specifically, the present invention relates to a flat or tubular leno woven fabric and a bag made from the fabric. The flat or tubular leno woven fabric includes at least one warp (6A), and the warp (6A) One of the strands (6B or 6C) of) is made of bulky yarn as the weft, and/or at least one of its weft (5A) is made of bulky yarn. The invention solves the problem of the roughness of leno woven fabrics made of hard yarns, especially regarding perishable goods and other goods that may be damaged by rough packaging. Woven fabrics generally include warp and weft structures formed by warp and weft respectively. Woven slit film tape fabrics usually include two sets of threads arranged in a warp structure and a weft structure. The thread is usually made of multiple slit film tapes. The fabric of the present invention has some bulky yarns introduced in a weave pattern to make the fabric softer than conventional fabrics. This key aspect of the invention has resulted in bags that are less rough for the goods than bags made from conventional leno fabrics made of hard yarn.

Woven fabrics generally include warp and weft structures formed by warp and weft respectively. Woven slit film tape fabrics usually include two sets of threads arranged in a warp structure and a weft structure. The thread is usually made of multiple slit film tapes. The threads from either group (warp structure or weft structure) are arranged parallel to each other and interleaved with threads from the second group (warp structure or warp structure). The lines from one group are oriented substantially at right angles to the lines from the other group. For a simple plain weave, the warp threads pass above and below the weft threads in an alternating pattern. In particular, for a given warp thread passing over a particular weft thread, the adjacent warp thread will pass under the particular weft thread, thereby locking the weft thread in place. The limitation of plain weave fabrics is the lack of porosity or openness.

A typical leno weave is different from plain weave. In leno knitting, the warp structure (6) is made of warp threads (6A), and the warp threads (6A) then have a pair of combined warp strands (6B, 6C). The weft structure (5) includes the weft threads (5A) interlaced with the warp threads (6A). However, between the weft threads (5A), the warp threads (6B, 6C) of the individual warp threads (6A) are added around each other Twist, thereby reducing the distance between the weft threads (5A) to almost zero. This type of leno weaving creates a space between the wefts, thus giving the fabric greater openness. The empty space between the wefts is used as a pivot point, resulting in a flexible fabric that easily conforms to the complex contours of the stored goods. The relative effectiveness of the pivot point can be enhanced or weakened by changing the warp/warp and weft/weft structure.

As shown in the schematic diagram of Figure 1, the prior art leno bag (1) has slit film tapes as warp/warp and weft/weft. Figure 1B shows an enlarged view of the structure of a traditional leno bag fabric, in which the weft/weft and warp/warp are made of plastic film tape. According to packaging requirements, the denier and width of warp/warp and weft/weft can be the same or different. This structure lacks flexibility (due to the sharpness or toughness of the belt edges) and low coverage.

Therefore, the fabric of the present invention (see Fig. 2) has some bulky yarns introduced in a weave pattern to make the fabric softer than conventional fabrics. This key aspect of the invention has resulted in bags that are less rough for the goods than bags made from conventional leno fabrics made of hard yarn.

There are several types that fall within the scope of the present invention, so that the weight of the bulky yarn (7) used in the fabric can be as high as 100% of the fabric weight (in gsm), and/or the rigidity used in the fabric The weight of the yarn (8) can be as high as 95% of the weight of the fabric (in gsm).

Depending on the type of yarn used to form the weft structure (5) and the warp structure (6), several weaving patterns are possible.

In a preferred embodiment of the present invention (see Figure 2A), the bulky yarn (7) is used as the weft/weft yarn (5A) of the weft structure (5). In this embodiment, in the warp/warp (6A) composed of warp pairs (6B, 6C), one strand is made of bulky yarn (7), and the other is made of hard yarn (8) Made. Here, the two warp strands (6B, 6C) are woven by twisting each other to form a loop (L). The weft (5A) is passed through the loop (L) of the twisted warp strand pair (6B, 6C).

Figures 2B and 2C show some weaving patterns in which the bulky yarn is part of the warp structure (6) of the fabric. Each warp thread (6A) includes two warp thread strands (6B, 6C), one is made of a hard yarn (8), and the other is made of a bulky yarn (7). However, the weft structure (5) may comprise a complete (Figure 2B) hard yarn (8) or a combination of hard yarns (8) and bulky yarns (7) arranged in several configurations (Figure 2C). For example, in the weft structure (5), the hard yarn (8) and the bulky yarn (7) can be alternated, or there may be only bulky yarn (7) or only hard yarn (8), or any number of continuous positioning The hard yarn (8) is followed by any number of bulky yarns (7).

Figures 3A, 3B and 3C show several other weaving patterns, in which the warp structure (6) of the fabric is formed entirely using bulky yarn (7). However, the weft structure (5) may include completely hard yarns (8) or a combination of hard yarns (8) and bulky yarns (7) arranged in several configurations. For example, in the weft structure (5), the hard yarn (8) and the bulky yarn (7) can be alternated, or there may be only bulky yarn (7) or only hard yarn (8), or any number of continuous positioning The hard yarn (8) is followed by any number of continuously positioned bulky yarns (7).

Figures 4A and 4B show several weaving patterns in which the warp structure (6) of the fabric is entirely made of hard yarn (8). Here, the weft structure (5) can be completely made of bulky yarn (7), or configured into an alternating layout of bulky yarn (7) and hard yarn (8).

Figures 5A and 5B show several weaving patterns in which the warp structure (6) is made so that any single warp thread (6A) can be made from either bulky yarn (7) or hard yarn (8). The warp threads (6A) are arranged in a pattern in which the warp threads (6A) entirely made of bulky yarn (7) and the warp threads (6A) entirely made of hard yarn (8) are alternately arranged. It is also possible to successively arrange several warp threads (6A) completely made of bulky yarn (7) before introducing the warp threads (6A) completely made of hard yarn (8). Combining this warp structure (6) pattern, the weft structure (5) pattern includes completely bulky yarn (7) or hard yarn (8). Alternatively, the weft structure (5) may include lines of bulky yarn (7) and hard yarn (8) arranged alternately.

Figures 6A, 6B and 6C show several further weaving patterns, in which the warp structure (6) is made so that at least one warp (6A) can be combined by one of the bulky yarn (7) and the hard yarn (8) It is made, that is, any one of the two warp strands (6B or 6C) is made of bulky yarn (7), and the other strand (6C or 6B) is made of hard yarn. The fabric may have any number of such warp threads arranged continuously or in an alternating arrangement with the warp threads (6A) made entirely of hard yarn. These warps (6A) are arranged in a pattern in which bulky yarns (7) and hard yarns (8) alternate. Combining this warp structure (6) pattern, the weft structure (5) pattern includes completely bulky yarn (7) or hard yarn (8). Alternatively, the weft structure (5) may include lines of bulky yarn (7) and hard yarn (8) arranged alternately.

Figures 7A, 7B and 7C show several further weaving patterns, in which the warp structure (6) is made so that at least one warp (6A) can be made from one of the bulky yarn (7) and the hard yarn (8) Combined production, that is, any one of the two warp strands (6B or 6C) is made of bulky yarn (7), and the other strand (6C or 6B) is made of hard yarn. In this embodiment, the warp structure (6) also includes one warp (6A) in which two warp strands (6B, 6C) are made of bulky yarn (7). The fabric may have warp threads of any one of the foregoing two types arranged continuously or in an alternating configuration with another type of warp threads (6A). Combining this warp structure (6) pattern, the weft structure (5) pattern includes completely bulky yarn (7) or hard yarn (8). Alternatively, the weft structure (5) may include lines of bulky yarn (7) and hard yarn (8) arranged alternately.

The hard yarn (8) used in the leno fabric of the present invention can be any type of slit film tape or monofilament yarn. The rigid yarn can be a fibrillated or folded or simple slit film made of polymer material (preferably polyolefin). Depending on the circumstances, the hard yarn can be made of biodegradable materials. The bulky yarn (7) contributes to increasing the softness of the fabric made of yarn due to its inherent structure, and also increases the friction force with adjacent yarns, which is necessary for the structural robustness of the fabric. The unique combination of bulky yarn (7) and hard yarn (8) in warp (6A) provides better stability and structural integrity for the overall material. The denier range of the hard yarn (8) used in the present invention is 50 to 1200, and the width is from 0.5 mm to 12 mm.

A bulky yarn (7) has been processed as a yarn with covering power or apparent volume compared with conventional yarns of the same linear density and the same basic material with normal twist. These bulky yarns are usually called Bulk continuous filament yarn (BCF). BCF yarn includes any continuous filament yarn whose smooth, straight fibers have been displaced from their closely packed parallel positions by introducing some form of crimping, crimping, loops or loops. Bulkiness imparts the aesthetic properties of spinning to filaments by modifying the surface properties and creating spaces between the fibers. The fabric is more absorbent and comfortable, and has better bulk, coverage and elasticity. These characteristics are important to protect the product line during storage/transportation. They are more breathable and moisture permeable. Static accumulation is low. The bulky yarn does not flake or fall off.

In one aspect of the present invention, the bulky yarn (7) can be made of biodegradable material or its combination with man-made fibers. Individual bulky yarn components will generally have a denier of about 100 to 2000, however, it is preferable to use yarn components having a denier of from 150 to 5000.

There are three types of bulky yarns: bulky yarn (bulky yarn or bulking yarn), stretch yarn and textured yarn.

The bulky yarn formed by inherent bulky fibers, such as those made of partially or completely hollow fibers along the same length, or those that cannot be tightly packed due to their cross-sectional shape, fiber alignment, rigidity, resilience, or natural crimp Fiber making yarn. Bulk yarn is used in a variety of products from carpets to underwear and sweaters to shoelaces. However, its use in leno fabrics for storing perishable and other types of goods is unknown.

Stretch yarns are thermoplastic filaments or spun yarns, which have high potential elastic stretch (30% to 100%), fast recovery and high yarn crimping. Stretch yarn has moderate bulkiness. Stretch yarn (nylon) is widely used in men's and women's socks, pantyhose, tights, swimming suits, and sweatshirts. However, it is unknown that these are used to make leno fabrics for storage/transportation of goods.

Loose yarns from two broad categories can be used: i) continuous multifilament textured yarns and ii) staple fiber spinning. The textured yarn is produced by the conventional original texturing or air texturing process. The air texturing process uses compressed air to change the texture of the yarn by disrupting the filaments that make up the bulky structure of the yarn and making them loops. Air textured bulky yarns are generally made of low-cost polypropylene, polyethylene or polyester or the like.

Textured yarn is a general term used for any continuous filament yarn. Its smooth, straight fibers have been displaced from their closely packed parallel positions by introducing some form of crimping, crimping, loops or loops. The textured yarn can be made of either filament fibers or short fibers cut from filaments that have been given a certain type of deformed configuration. Most textured yarns are made of filament fibers. Textured yarns can be uniform in shape and smooth like simple yarns, and they can be irregular, so they have some similarities with complex yarn structures. Deformation gives smooth filaments the aesthetic properties of spinning by changing the surface properties and creating spaces between the fibers. This gives the fabric higher air permeability, moisture permeability, greater absorption, more comfort, and has less static electricity accumulation.

Textured yarn is a general term used for filament(s). Compared with conventional yarns with similar filament counts, the filament(s) have been given a significantly larger apparent volume or bulk, or have The filament becomes more extensible due to deformation of the filament through physical, chemical or heat treatment or a combination of these. Deformation introduces permanent deformation, crimping, loops, loops or wrinkles without destroying the basic continuity of the filament. The texture of this improved yarn. Deformation imparts softness and wooliness to the yarn, and increases the warmth and comfort of the fabric. Loops and curls trap many small air pockets. The filament prevents air from moving and holds the fabric together. Especially in the case of leno fabrics used for storage of perishable goods, the softness of the fabric is extremely important to reduce damage to the goods during storage and/or transportation.

The main purpose of deforming filament yarn is to form a bulky structure, which is expected for the following reasons: -The voids in the structure make the material have good insulating properties. -The voids in the structure change the density of the material, which makes it light weight and good covering properties. -The non-woven surface of the yarn imparts scattered light reflection, which in turn imparts a desired mat appearance. － The sponge-like structure feels softer than single-end twisted flat yarn. － Compared with flat yarns, the structure of crimped filaments gives the structure a lower effective modulus of elasticity.

Artificial textured yarn is a fully stretched, fully oriented multifilament yarn, which has soft crimp, high bulkiness, cotton-like texture, and extremely high durability and retention properties. This is manufactured by using a high-speed texturing machine to deform partially oriented yarns. The textured filament yarn can be a stretch textured or an air textured yarn. Yarn produced by air-jet texturing is called air texturing yarn (ATY). The air-jet texturing process is a purely mechanical method that uses a stream of cold air to produce bulky yarn with low elongation. ATY is very bulky, with permanent curls and loops. In ATY, artificial yarn can be combined with natural fiber yarn.

It can provide various effects to the yarn. These effects are crimping, stretching and relaxation, air-jet bulking, pointed crimping, circular crimping, crimping using heating gears and crimping using the stuffing box method.

Another type of bulky yarn may come from short fibers. Short fibers are relatively short in length, usually only a few inches long. They are twisted together to form longer strands. The two main types of staple fiber yarns are conventional ring spinning and friction spinning. Friction spinning is produced by friction spinning process (such as Dref) that produces large diameter, bulky yarn.

The dimensional rigidity of the bag structure of the present invention is provided by the hard yarn (8) (see FIG. 2A). The hard yarn (8) can be monofilament, cut film tape or folded film tape or bonding yarn or the like.

The bag fabric can be made using conventional flat looms or circular looms designed for leno weaving.

The woven improved open mesh structure of the fabric obtained by the present disclosure here can be configured or alternated by using several different yarns/fibers (combination of geometry, type, cross section, etc.) and in a specific pattern The textile structure is further enhanced. The engineering placement of completely different yarn types directly contributes to the enhanced dimensional structure and mechanical properties.

In addition, during the cyclic load test, the conventional leno fabric made of plastic tape exhibited a dimensional deformation of about 4% to 12%, while the present leno fabric with a combination of bulky and hard yarns in the warp exhibited Negligible dimensional deformation, resulting in a more stable structure.

Some other aspects of the invention are now disclosed.

In one aspect, artificial yarns can be used to produce hard and bulky yarns. In another aspect, either or both of the bulky yarn or the hard yarn may be biodegradable. In another aspect of the present invention, any yarn may contain colors or additives or inorganic fillers or processing aids or UV stabilizers.

The total weight of the leno fabric of the present invention is less than 120 gsm.

Although the above description contains many specificities, these should not be construed as limitations on the scope of the invention, but should be taken as examples of preferred embodiments of the invention. It must be realized that without departing from the spirit and scope of the present invention, modifications and changes based on the disclosure given above are possible. Therefore, the scope of the present invention should not be judged by the illustrated embodiments, but should be judged by the scope of the appended invention application and its legal equivalents.

1: Prior art leno bag/prior art leno tubular fabric 2: Weft slit film tape (previous technology) 3: Warp slit film tape 4: Leno tubular fabric of the present invention 5: zonal structure 5A: Weft/Weft 6: warp structure 6A: Warp/Warp 6B and 6C: Two warp strands forming a warp 7: bulky yarn 8: hard yarn L: ring

Figure 1A: Prior art leno tubular fabric Figure 1B: An enlarged view of the structure of the prior art leno fabric Figure 2: Leno tubular fabric of the present invention Figure 2A, Figure 2B, Figure 2C: Some knitting patterns covered by the scope of the present invention Figure 3A, Figure 3B, Figure 3C: Some other knitting patterns covered by the scope of the present invention Figure 4A and Figure 4B: Some more knitting patterns covered by the scope of the present invention Figure 5A, Figure 5B, Figure 5C: More knitting patterns covered by the scope of the present invention Fig. 6A, Fig. 6B, Fig. 6C: Many other knitting patterns covered by the scope of the present invention Figure 7A, Figure 7B, Figure 7C: Some other knitting patterns covered by the scope of the present invention

5: zonal structure

5A: Weft/Weft

6: warp structure

6A: Warp/Warp

6B and 6C: Two warp strands forming a warp

7: bulky yarn

8: hard yarn

L: ring

Claims (34)

An open mesh leno fabric, the fabric includes a warp structure (6) made of warp threads (6A) and a weft structure (5) made of weft threads (5A), the warp threads (6A) It consists of two warp strands, namely a first warp strand (6B) and a second warp strand (6C). The two warp strands (6B, 6C) are woven to form a loop (L), A single weft thread (5A) passes through each loop (L), and is characterized in that at least some of the warp threads (6A) and/or the weft threads (5A) comprise bulky yarns. For example, the open mesh leno fabric of claim 1, wherein any one of the two warp strands (6B or 6C) is made of bulky yarn (7), and the other (6C or 6B) is Made of a hard yarn (8). Such as the open mesh leno fabric of claim 2, wherein all the weft threads (5A) are made of bulky yarn. For example, the open mesh leno fabric of claim 2, wherein all the weft threads (5A) are made of hard yarn. For example, in the open mesh leno fabric of claim 2, some of the weft threads (5A) are made of bulky yarn, and the other weft threads (5A) are made of hard yarn. Such as the open mesh leno fabric of claim 1, wherein both the two warp strands (6B or 6C) are made of bulky yarn (7). Such as the open mesh leno fabric of claim 6, wherein all the weft threads (5A) are made of bulky yarn (7). Such as the open mesh leno fabric of claim 6, wherein all the weft threads (5A) are made of hard yarn (8). For example, in the open mesh leno fabric of claim 6, some of the weft threads (5A) are made of bulky yarn (7), and the other weft threads (5A) are made of hard yarn (8). Such as the open mesh leno fabric of claim 1, wherein both the two warp strands (6B or 6C) are made of hard yarn (8). For example, the open mesh leno fabric of claim 10, wherein all the weft threads (5A) are made of bulky yarn (7). For example, in the open mesh leno fabric of claim 10, some of the weft threads (5A) are made of bulky yarn (7), and the other weft threads (5A) are made of hard yarn (8). For example, the open mesh leno fabric of claim 1, wherein the two warp strands (6B and 6C) of at least one warp (6A) are made of bulky yarn (7), and at least one of the other The two warp strands (6B, 6C) of the warp thread (6A) are made of hard yarn (8). Such as the open mesh leno fabric of claim 13, wherein all the weft threads (5A) are made of bulky yarn (7). Such as the open mesh leno fabric of claim 13, wherein all the weft threads (5A) are made of hard yarn (8). For example, in the open mesh leno fabric of claim 13, some of the weft threads (5A) are made of bulky yarn (7), and the other weft threads (5A) are made of hard yarn (8). For example, the open mesh leno fabric of claim 1, wherein at least one warp thread (6A) has one warp thread strand (6B or 6C) made of bulky yarn (7) and one made of hard yarn The other warp thread (6C or 6B), and the two warp threads (6B and 6C) of at least one other warp thread (6A) are made of hard yarn (8). Such as the open mesh leno fabric of claim 17, wherein all the weft threads (5A) are made of bulky yarn (7). Such as the open mesh leno fabric of claim 17, wherein all the weft threads (5A) are made of hard yarn (8). For example, in the open mesh leno fabric of claim 17, some of the weft threads (5A) are made of bulky yarn (7), and the other weft threads (5A) are made of hard yarn (8). For example, the open mesh leno fabric of claim 1, wherein at least one warp thread (6A) has one warp thread strand (6B or 6C) made of bulky yarn (7) and one made of hard yarn The other warp thread (6C or 6B), and the two warp threads (6B and 6C) of at least one other warp thread (6A) are made of bulky yarn (7). For example, the open mesh leno fabric of claim 21, wherein all the weft threads (5A) are made of bulky yarn (7). Such as the open mesh leno fabric of claim 17, wherein all the weft threads (5A) are made of hard yarn (8). For example, in the open mesh leno fabric of claim 17, some of the weft threads (5A) are made of bulky yarn (7), and the other weft threads (5A) are made of hard yarn (8). The open mesh leno fabric of any one of claims 1 to 24, wherein the bulky yarn is one of a combination of bulky yarn, stretch yarn, textured yarn, or any of these production. Such as the open mesh leno fabric of claim 25, wherein the bulky yarn (7) is selected from the group consisting of continuous multifilament textured yarn and staple fiber spinning. For example, the open mesh leno fabric of claim 25, wherein the denier of the bulky yarn (7) is between 150 and 3000. For example, the open mesh leno fabric of claim 25, in which the deformation of the textured yarn is by crimping, stretching and relaxing, using air-jet bulking, pointed crimping, circular crimping, heating gear crimping and using stuffing box Obtained by any of the curling procedures. Such as the open mesh leno fabric of claim 25, wherein the hard yarn (8) used in the present invention has a denier of 50 to 1200 and a width between 0.5 mm and 12 mm. Such as the open mesh leno fabric of claim 26, wherein the short fiber spinning is loop spinning or friction spinning. The open mesh leno fabric of any one of claims 1-24, wherein the bulky yarn (7) and/or the hard yarn (8) is biodegradable. Such as the open mesh leno fabric of any one of claims 1 to 24, wherein the bulky yarn (7) and/or the hard yarn (8) contains color pigments, additives, inorganic fillers, processing aids Any component of one of the group consisting of the composition of the agent and the UV stabilizer. A bag made of open mesh leno fabric, characterized in that the fabric includes a warp structure (6) made of warp threads (6A) and a weft structure (5) made of weft threads (5A) , The warp threads (6A) are composed of two warp threads, namely a first warp thread strand (6B) and a second warp thread strand (6C). The two warp threads (6B, 6C) are knitted To form a loop (L), a single weft thread (5A) passes through each loop (L), characterized in that at least some of the warp threads (6A) and/or the weft threads (5A) comprise bulky yarns . A method of manufacturing leno fabric, characterized in that the method includes the following steps: A warp structure (6) made of warp threads (6A) and a weft structure (5) made of weft threads (5A) are provided. The warp threads (6A) consist of two warp threads, namely a first The warp thread (6B) and a second warp thread (6C) are composed, Weaving the two warp strands (6B, 6C) to form a loop (L), a single weft thread (5A) passes through each loop (L), It is characterized in that at least some of the warp threads (6A) and/or the weft threads (5A) comprise bulky yarns.

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